JP6864546B2 - Three-phase inverter instantaneous value analysis device, three-phase inverter instantaneous value analysis method and program - Google Patents

Description

The present invention relates to a three-phase inverter instantaneous value analysis device, a three-phase inverter instantaneous value analysis method, and a program.

Conventionally, devices, methods and programs for consistently simulating process specifications to power converter characteristics have been known (see, for example, Patent Document 1).

Further, with the spread of distributed power sources connected to the distribution system via an inverter, it has become important to analyze the dynamic behavior of the distribution system with respect to voltage and the like. For such analysis, instantaneous value analysis that can simulate the dynamic characteristics of the inverter in detail at the waveform level is an effective means.
On the other hand, in the instantaneous value analysis including the inverter equipment, in order to reproduce the switching operation, other power equipment (transformer, tap switching transformer at load (LRT), high voltage automatic voltage regulator (SVR)), high voltage automatic voltage regulator (SVR) : Step voltage regulator), etc.), it is necessary to set the calculation time step of the analysis smaller, which is a factor that limits the calculation speed. For other electric power equipment, the dynamic characteristics of the fundamental wave component can be simulated even if the calculation time step is calculated in about 500 μs.

FIG. 8 is a schematic configuration diagram of the conventional analysis model RM1.
The analysis model RM1 is a switching model and is one of the typical modeling methods. The analysis model RM1 simulates the switching operation of the individual transistors M2A to M2F. In recent equipment, the operating frequencies of the transistors M2A to M2F are designed to be about several kHz to 20 kHz, and in order to simulate this, it is necessary to set the calculation time step of the analysis model RM1 to several μs or less. Therefore, it is necessary to set the calculation time step of the analysis of the analysis model RM1 to about 1/500 smaller than that of other electric power equipment.
In the example shown in FIG. 8, the transistors M2A and M2B connected in series are arranged between the first DC terminal M21 and the second DC terminal M22. Further, the transistors M2C and M2D connected in series are arranged between the first DC terminal M21 and the second DC terminal M22. Further, the transistors M2E and M2F connected in series are arranged between the first DC terminal M21 and the second DC terminal M22.
The diode M2a is connected to the transistor M2A in antiparallel. The diode M2b is connected to the transistor M2B in antiparallel. The diode M2c is connected to the transistor M2C in antiparallel. The diode M2d is connected to the transistor M2D in antiparallel. The diode M2e is connected to the transistor M2E in antiparallel. The diode M2f is connected to the transistor M2F in antiparallel.
The intermediate position Mab between the transistor M2A and the transistor M2B is connected to the first AC terminal M11 via the reactor L1. The intermediate position Mcd between the transistor M2C and the transistor M2D is connected to the second AC terminal M12 via the reactor L2. The intermediate position Mef between the transistor M2E and the transistor M2F is connected to the third AC terminal M13 via the reactor L3.
The first AC terminal M11 is connected to the second AC terminal M12 via the capacitor C2. The second AC terminal M12 is connected to the third AC terminal M13 via the capacitor C3. The third AC terminal M13 is connected to the first AC terminal M11 via the capacitor C1.

FIG. 9 is a schematic configuration diagram of another conventional analysis model RM2.
In recent years, an average value modeling method has been developed that can be used at large calculation time intervals by not simulating the switching operation of the inverter. The analysis model RM2 shown in FIG. 9 is a typical model of this, and is called a voltage source type average value model. The analysis model RM2 does not perform voltage modulation.
In the example shown in FIG. 9, the second DC terminal M22 is connected to the first AC terminal M11 via the control voltage source V1, the switch S1 and the reactor L1 based on the voltage command value. Further, the second DC terminal M22 is connected to the second AC terminal M12 via the control voltage source V2, the switch S2 and the reactor L2 based on the voltage command value. Further, the second DC terminal M22 is connected to the third AC terminal M13 via a control voltage source V3 based on a voltage command value, a switch S3, and a reactor L3.
In the analysis model RM2, the calculation time step can be increased to about 40 μs, and although the speed is higher than that of the analysis model RM1 (switching model), it is still 1 / compared to the analysis model of other distribution equipment. It requires a calculation time step as small as 40.

Japanese Unexamined Patent Publication No. 2004-213144

In order to speed up the analysis of the dynamic behavior of the distribution system including the grid interconnection inverter, it is necessary to have an instantaneous value analysis model of the three-phase inverter that can be used in the same calculation time interval as other power equipment. is there.
In the instantaneous value analysis model of the three-phase inverter, when the signal is passed from the converter control unit to the three-phase inverter main circuit, a delay of the calculation time is generated. This delay causes a calculation error in the phase of the output current (alternating current) of the three-phase inverter. This calculation error increases as the calculation time step increases. Even if the calculation time step is set large, it is necessary to make an analysis model that can be calculated with a practically small error.

The present invention has been made in view of the above problems, and is a three-phase inverter instantaneous value analysis device and a three-phase inverter instantaneous value analysis method capable of suppressing a calculation error even if a large calculation time step is set. And the purpose of providing the program.

[1] In order to achieve the above object, the three-phase inverter instantaneous value analysis device according to one aspect of the present invention is a three-phase inverter instantaneous value analysis device that analyzes the instantaneous value of the three-phase inverter by using an analysis model. The analysis model includes an AC terminal side portion of the three-phase inverter main circuit, a DC terminal side portion of the three-phase inverter main circuit, a converter control unit that controls the three-phase inverter main circuit, and a DC current. A calculation unit is provided, and the AC terminal side portion includes a first current source arranged in a first wiring connecting the first AC terminal and the second AC terminal, and the second AC terminal and the third AC terminal. A second current source arranged in the second wiring for connecting the above is provided, and the DC terminal side portion includes a third current source arranged in the third wiring for connecting the first DC terminal and the second DC terminal. The converter control unit includes an AC current command value calculation unit, a phase detector, and a phase correction amount calculation unit. The phase detector has a DC voltage of the first DC terminal and the second DC. The first voltage between the first AC terminal and the second AC terminal, which is generated by being input between the terminals, and the second voltage between the second AC terminal and the third AC terminal. The AC voltage phase is detected based on the voltage, the phase correction amount calculation unit calculates the phase correction amount for correcting the AC voltage phase, and the AC current command value calculation unit calculates the AC voltage phase and the AC voltage phase. The first command value of the alternating current and the second command value of the alternating current are calculated based on the total value obtained by adding the phase correction amount, and the DC current calculation unit uses the first command value and the first voltage. The sum of the product of the second command value and the second voltage is between the DC current injected by the third current source and the first DC terminal and the second DC terminal. The DC current is calculated so as to be equal to the product of the third voltage, and the first current source injects an alternating current into the alternating current terminal side portion based on the first command value, and the second current source. The current source injects an alternating current into the AC terminal side portion based on the second command value, and the third current source injects the DC current.

[2] Further, in the three-phase inverter instantaneous value analysis device according to one aspect of the present invention, the AC current command value calculation unit calculates the third command value of the AC current in the dq coordinate system. A system AC current command value calculation unit and an abc coordinate system AC current command value calculation unit for calculating the first command value and the second command value are provided, and the abc coordinate system AC current is provided. The command value calculation unit may calculate the first command value and the second command value based on the total value and the third command value.

[3] Further, in the three-phase inverter instantaneous value analyzer according to one aspect of the present invention, the dq coordinate system AC current command value calculation unit includes a DC voltage controller and an reactive power controller. The DC voltage controller calculates the d-axis component of the third command value based on the difference between the third voltage and the command value of the third voltage, and the reactive power controller calculates the reactive power command. The q-axis component of the third command value may be calculated based on the difference between the value and the invalid power detection value.

[4] Further, in the three-phase inverter instantaneous value analyzer according to one aspect of the present invention, the DC terminal side portion includes a first diode, a second diode, a third diode, a fourth diode, and a fifth diode. A diode and a sixth diode are provided, the first diode and the second diode are connected in series between the first DC terminal and the second DC terminal, and the third diode and the fourth diode are connected in series. , The first diode and the second diode are connected in series between the first DC terminal and the second DC terminal, and the fifth diode and the sixth diode are the first diode. And, in parallel with the second diode, the first DC terminal and the second DC terminal are connected in series, and the intermediate position between the first diode and the second diode is the first AC terminal. The intermediate position between the third diode and the fourth diode is connected to the second AC terminal, and the intermediate position between the fifth diode and the sixth diode is connected to the third AC terminal. Then, the converter control unit has a first multiplier that blocks the input of the first command value to the first current source and a second multiplication that blocks the input of the second command value to the second current source. It may be provided with a vessel.

[5] In order to achieve the above object, the three-phase inverter instantaneous value analysis method according to one aspect of the present invention is a three-phase inverter instantaneous value analysis method that analyzes the instantaneous value of a three-phase inverter by using an analysis model. The analysis model includes an AC terminal side portion of the three-phase inverter main circuit, a DC terminal side portion of the three-phase inverter main circuit, a converter control unit that controls the three-phase inverter main circuit, and a DC current. A calculation unit is provided, and the AC terminal side portion includes a first current source arranged in a first wiring connecting the first AC terminal and the second AC terminal, and the second AC terminal and the third AC terminal. A second current source arranged in the second wiring for connecting the above is provided, and the DC terminal side portion includes a third current source arranged in the third wiring for connecting the first DC terminal and the second DC terminal. The converter control unit includes an AC current command value calculation unit, a phase detector, and a phase correction amount calculation unit, and the phase detector has a DC voltage of the first DC terminal and the second DC. The first voltage between the first AC terminal and the second AC terminal, which is generated by being input between the terminals, and the second voltage between the second AC terminal and the third AC terminal. The step of detecting the AC voltage phase based on the voltage, the step of calculating the phase correction amount for correcting the AC voltage phase by the phase correction amount calculation unit, and the AC current command value calculation unit for the AC current command value calculation unit. The step of calculating the first command value of the alternating current and the second command value of the alternating current based on the total value obtained by adding the voltage phase and the phase correction amount, and the DC current calculation unit perform the first command value. The sum of the product of the first voltage and the product of the second command value and the second voltage is the DC current injected by the third current source, the first DC terminal, and the second. The step of calculating the DC current so that the product with the third voltage between the DC terminal and the DC terminal is equal to the product, and the first current source transfers an AC current to the AC terminal side based on the first command value. The second current source injects an alternating current into the AC terminal side portion based on the second command value, and the third current source injects the DC current. ..

[6] In order to achieve the above object, the program according to one aspect of the present invention is a program that causes a computer to analyze an instantaneous value of a three-phase inverter by using an analysis model, and the analysis model is a three-phase. The AC terminal side of the inverter main circuit, the DC terminal side of the three-phase inverter main circuit, the converter control unit that controls the three-phase inverter main circuit, and the DC current calculation unit are provided. The unit is arranged in the first current source arranged in the first wiring connecting the first AC terminal and the second AC terminal, and in the second wiring connecting the second AC terminal and the third AC terminal. A second current source is provided, the DC terminal side portion includes a third current source arranged in a third wiring connecting the first DC terminal and the second DC terminal, and the converter control unit is an alternating current. A current command value calculation unit, a phase detector, and a phase correction amount calculation unit are provided, and the phase detector receives a DC voltage between the first DC terminal and the second DC terminal. The AC voltage phase is determined based on the generated first voltage between the first AC terminal and the second AC terminal and the second voltage between the second AC terminal and the third AC terminal. The step of detecting, the step of calculating the phase correction amount for correcting the AC voltage phase by the phase correction amount calculation unit, and the step of calculating the phase correction amount for correcting the AC voltage phase, and the AC current command value calculation unit add the AC voltage phase and the phase correction amount. Based on the total value, the step of calculating the first command value of the alternating current and the second command value of the alternating current, and the DC current calculation unit determines the product of the first command value and the first voltage. The sum of the product of the second command value and the second voltage is the DC current injected by the third current source and the third voltage between the first DC terminal and the second DC terminal. The step of calculating the DC current and the first current source injecting an alternating current into the AC terminal side portion based on the first command value so as to be equal to the product of the second current source. However, based on the second command value, the alternating current is injected into the AC terminal side portion, and the third current source causes the computer to perform the step of injecting the DC current.

According to the present invention, the calculation error can be suppressed even if the calculation time step is set large.

It is a schematic block diagram of the three-phase inverter instantaneous value analysis apparatus of 1st Embodiment. It is a detailed figure of the converter control part of the three-phase inverter instantaneous value analysis apparatus of 1st Embodiment. It is a flowchart which shows an example of the three-phase inverter instantaneous value analysis method by 1st Embodiment. It is a schematic block diagram of the three-phase inverter instantaneous value analysis apparatus of 2nd Embodiment. It is a detailed figure of the converter control part of the three-phase inverter instantaneous value analysis apparatus of 2nd Embodiment. It is a schematic block diagram of the three-phase inverter instantaneous value analysis apparatus of 3rd Embodiment. It is a detailed figure of the converter control part of the three-phase inverter instantaneous value analysis apparatus of 3rd Embodiment. It is a schematic block diagram of the conventional analysis model. It is a schematic block diagram of another conventional analysis model. It is a figure which showed the steady-state characteristic of the analysis model of 2nd Embodiment. It is a figure which showed the characteristic at the time of a sudden phase change of the analysis model of 1st to 3rd Embodiment. It is a figure which showed the characteristic at the time of a gate block of the analysis model of 2nd and 3rd Embodiment. It is a figure which showed the characteristic at the time of power-source voltage drop of the analysis model of 1st to 3rd Embodiment. It is a figure which showed the characteristic of the analysis model of 1st to 3rd Embodiment when the system voltage drops by one phase. It is a figure which showed the characteristic of the analysis model of the 1st to 3rd Embodiments when the power generation output of the photovoltaic power generation facility connected to a three-phase inverter changes. It is a figure which showed the characteristic of the analysis model of the 2nd and 3rd Embodiment at the time of emergency stop of a three-phase inverter.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First Embodiment)
FIG. 1 is a schematic configuration diagram of the three-phase inverter instantaneous value analysis device 1 of the first embodiment. FIG. 2 is a detailed view of the converter control unit M3 and the like of the three-phase inverter instantaneous value analysis device 1 of the first embodiment.
In the examples shown in FIGS. 1 and 2, the three-phase inverter instantaneous value analysis device 1 analyzes the instantaneous value (particularly, the instantaneous value voltage and the instantaneous value current) of the three-phase inverter by using the analysis model M. The analysis model M includes an AC terminal side portion M1 of the three-phase inverter main circuit MM, a DC terminal side portion M2 of the three-phase inverter main circuit MM, a converter control unit M3, and a DC current calculation unit M4. ..
In the examples shown in FIGS. 1 and 2, the three-phase inverter main circuit MM is realized in the simulation device, but in another example, the three-phase inverter main circuit MM may be realized by using an actual three-phase inverter. ..

In the example shown in FIGS. 1 and 2, the AC terminal side portion M1 is the first AC terminal M11, the second AC terminal M12, the third AC terminal M13, the wiring ML1, the wiring ML2, and the wiring ML3. The wiring ML4, the current source M14, the current source M15, the voltmeter M16, and the voltmeter M17 are provided.
The wiring ML1 connects the first AC terminal M11 and the second AC terminal M12. The current source M14 is arranged in the wiring ML1. The wiring ML2 connects the second AC terminal M12 and the third AC terminal M13. The current source M15 is arranged in the wiring ML2.
The wiring ML3 connects the first AC terminal M11 and the second AC terminal M12, and is connected in parallel to the wiring ML1. The voltmeter M16 is arranged in the wiring ML3 and detects _{the AC voltage v uv} between the first AC terminal M11 and the second AC terminal M12.
The wiring ML4 connects the second AC terminal M12 and the third AC terminal M13, and is connected in parallel to the wiring ML2. _{The voltmeter M17 is arranged in the wiring ML4} and detects the AC voltage vvw between the second AC terminal M12 and the third AC terminal M13.

In the example shown in FIGS. 1 and 2, the DC terminal side portion M2 is the first DC terminal M21, the second DC terminal M22, the wiring ML5, the wiring ML6, the current source M23, the voltmeter M24, and the capacitor. It is equipped with M25.
The wiring ML5 connects the first DC terminal M21 and the second DC terminal M22. The current source M23 is arranged in the wiring ML5. The current source M23 _{injects a direct current idc} into the direct current terminal side portion M2. The wiring ML6 connects the first DC terminal M21 and the second DC terminal M22, and is connected in parallel to the wiring ML5. The voltmeter M24 is arranged in the wiring ML6 and detects _{the DC voltage vdc} between the first DC terminal M21 and the second DC terminal M22. The capacitor M25 is arranged between the first DC terminal M21 and the second DC terminal M22, and is connected in parallel to the current source M23 and the voltmeter M24.

In the examples shown in FIGS. 1 and 2, the converter control unit M3 controls the three-phase inverter main circuit MM. The converter control unit M3 includes a phase detector M31, an AC current command value calculation unit M32, an AC current command value calculation unit M33, a phase correction amount calculation unit M34, and a phase correction amount addition unit M35. ..
The AC current command value calculation unit M32 is an effective / ineffective power controller M32a. Active and reactive power controller M32a is the command value of the alternating current in the d-q coordinate system _i ^d _*, calculates the _i ^{q *.} The AC current command values _id ^* and i _q ^* in the dq coordinate system are input to the AC current command value calculation unit M33.
The AC current command value calculation unit M33 is an abc-dq inverse conversion unit M33a. abc-dq inverse converter M33a is the command value of the alternating current in the dq coordinate system _i ^d _*, the _i ^{q *,} the abc-dq inverse conversion, the command value of the alternating current in the a-b-c coordinate system i Calculate _u ^* , _iv ^* , and i _w ^*. The sum of the command value i _u ^* , the command value i _v ^*, and the command value i _w ^* is zero. That is, since the sum of the three-phase AC current values output by the three-phase inverter is held at zero, if the current sources M14 and M15 are connected to the U-phase and W-phase, the remaining V-phase AC current values will also be It is determined.

In the example shown in FIGS. 1 and 2, the voltmeter M16 has a first AC terminal M11 and a second AC terminal M12 by inputting a DC voltage between the first DC terminal M21 and the second DC terminal M22. The AC voltage v _uv generated between and is detected. _{The voltmeter M17 has an AC voltage v vw} generated between the second AC terminal M12 and the third AC terminal M13 when the DC voltage is input between the first DC terminal M21 and the second DC terminal M22. Is detected. The AC voltage v _uv and the AC voltage v _vw are input to the phase detector M31.
The phase detector M31 detects the AC voltage phase θs based on the AC voltage _{v uv} and the AC voltage v v _w.
The AC current command value calculation unit M33 basically calculates the AC current command value i _u ^* and the AC current command value i _w ^* based on the AC voltage phase θs.
DC current calculation unit M4, based on the energy conservation law (i.e., as the energy conservation law is established in the AC terminal side M1 and the DC terminals side M2), calculates the direct current i _dc. That is, the DC current calculation unit M4 is a command value _i ^{u *} and the voltage _{v uv} of the alternating current to the product _v uv _i ^{u *} of the product _v vw _{i w} of the command value _i ^{w *} and the voltage _{v vw} alternating current ^The DC current i _dc is calculated so that the sum with _{* (v uv} i _u ^* + v _vw i _w ^* ) is equal to the product v _dc i _{dc of} the DC current i _dc and the voltage v _dc.
The current source M14 injects an alternating current into the AC terminal side M1 based on _{the command value i u} ^* , and the current source M15 injects an alternating current into the AC terminal side M1 based on the _{command value i w} ^*. To do. The current source M23 injects the _{calculated direct current idc.}

In the three-phase inverter instantaneous value analyzer 1 of the first embodiment, for the purpose of suppressing the calculation load, shortening the required calculation time, etc., the calculation time step (calculation time interval) in the converter control unit M3 is different. It is set to a value as large as the power equipment of.
Therefore, the value of the AC voltage phase θs obtained at a certain time (time) is already old at the time of the next calculation of the AC current command value calculation unit M33 for calculating the _{next command values i u} ^* and i _w ^*. It has become a value (that is, it has been delayed by one calculation time step), and is different from the true value of the AC voltage phase θs at the time of the next calculation.
Therefore, at the time of the next calculation of the AC current command value calculation unit M33 for calculating the next command values i _u ^* and i _w ^* , the AC current command value calculation unit M33 temporarily determines the value of the AC voltage phase θs (that is,). , Old values) When the next command values i _u ^* and i _w ^* are calculated, the calculated next command values i _u ^* and i _w ^* include an error.
Therefore, in the three-phase inverter instantaneous value analysis device 1 of the first embodiment, as will be described later, at the time of the next calculation of the AC current command value calculation unit M33 for calculating the _{next command values i u} ^* and i _w ^*. , The AC current command value calculation unit M33 calculates the next command values i _u ^* and i _w ^* based on the corrected AC voltage phase θs.

In the examples shown in FIGS. 1 and 2, the phase correction amount calculation unit M34 calculates the phase correction amount 2πf Δt for correcting the AC voltage phase θs. f is the fundamental wave frequency in the AC terminal side portion M1, and Δt is the calculation time step in the converter control unit M3. The phase correction amount addition unit M35 adds the AC voltage phase θs and the phase correction amount 2πfΔt (that is, advances the phase in advance), and calculates the total value (θs + 2πfΔt). As a result, the delay time when the signal is passed from the converter control unit M3 to the three-phase inverter main circuit MM is corrected, and the occurrence of calculation error (specifically, the phase delay of the output current of the three-phase inverter) is suppressed. be able to.
The AC current command value calculation unit M33 is the time when the time corresponding to the calculation time step has elapsed from the time when _{the command values i u} ^* , _iv ^* , and i _w ^{* of the AC current in the abc coordinate system have been calculated last time.} the next calculation is, the total value (θs + 2πf △ t), the command value of the alternating current in the d-q coordinate system _i ^d _*, based on the ^{_{i q *, a-b-}} c coordinate system of the alternating current Calculate the command values i _u ^* , i _v ^* , i _w ^*.

FIG. 3 is a flowchart showing an example of the three-phase inverter instantaneous value analysis method according to the first embodiment.
In the example shown in FIG. 3, in step S1, the three-phase inverter instantaneous value analysis device 1 sets the initial value and inputs the DC voltage between the first DC terminal M21 and the second DC terminal M22. At this time, the injection amount of the alternating current by the current sources M14 and M15 is set to zero, and the injection amount of the direct current by the current sources M23 is set to zero.
Next, in step S2, the three-phase inverter instantaneous value analysis device 1 calculates the _{voltages v uv} , v v _w , and v _dc. Specifically, the voltmeter M16 _{detects the AC voltage v uv} , the voltmeter M17 _{detects the AC voltage v vw} , and the voltmeter M24 detects the _{DC voltage v dc.}
Next, in step S3, the phase detector M31 detects the AC voltage phase θs based on the AC voltage _{v uv} and the AC voltage v v _w.
Next, in step S4, the phase correction amount calculation unit M34 calculates the phase correction amount 2πf Δt for correcting the AC voltage phase θs.
Then, in step S5, the AC current command value calculation unit M33 is, the AC voltage phase [theta] s and the total value of the phase correction amount 2 [pi] f △ t and (θs + 2πf △ t), the command value of the alternating current in the d-q coordinate system _{i d} ^{Based on *} and i _q ^* _{, the command values i u} ^* , i _v ^* , and i _w ^* of the alternating current in the abc coordinate system are calculated.
Next, in step S6, the DC current calculation unit M4 _{directs current from the energy conservation law (v uv} i _u ^* + v v _w i ^{w *} = v _dc i _dc ), the command value i _u ^*, and the command value i _w ^*. Calculate the current i _dc.
Next, in step S7, whether or not the converter control unit M3 has the following calculation, that is, the command values i _u ^* , i of the AC current in the abc coordinate system by the AC current command value calculation unit M33. _It is determined whether or not there is the next calculation of ^{v *} and i _w ^*. If YES, the process proceeds to step S8, and if NO, the routine shown in FIG. 3 is terminated.
In step S8, the current source M14 injects an alternating current into the AC terminal side portion M1 based on _{the command value i u} ^* , and the current source M15 injects an alternating current into the alternating current terminal side based on the _{command value i w} ^*. Inject into part M1. The current source M23 _{injects a direct current idc} into the direct current terminal side portion M2. Then, the process returns to step S2.

(Second Embodiment)
Hereinafter, the three-phase inverter instantaneous value analysis device 1 of the second embodiment will be described. The three-phase inverter instantaneous value analysis device 1 of the second embodiment is configured in the same manner as the three-phase inverter instantaneous value analysis device 1 of the first embodiment, except for the points described later. Therefore, according to the three-phase inverter instantaneous value analysis device 1 of the second embodiment, the same effect as that of the three-phase inverter instantaneous value analysis device 1 of the first embodiment can be obtained except for the points described later.

FIG. 4 is a schematic configuration diagram of the three-phase inverter instantaneous value analysis device 1 of the second embodiment. FIG. 5 is a detailed view of the converter control unit M3 and the like of the three-phase inverter instantaneous value analysis device 1 of the second embodiment.
As described above, in the examples shown in FIGS. 1 and 2, the DC terminal side portion M2 is the first DC terminal M21, the second DC terminal M22, the wiring ML5, the wiring ML6, the current source M23, and the voltage. A total of M24 and a capacitor M25 are provided.
On the other hand, in the example shown in FIGS. 4 and 5, the DC terminal side portion M2 is the first DC terminal M21, the second DC terminal M22, the wiring ML5, the wiring ML6, the wiring ML7, the wiring ML8, and the wiring. It includes an ML9, a current source M23, a voltmeter M24, a capacitor M25, and diodes M2a to M2f.

In the examples shown in FIGS. 4 and 5, the wiring ML7 connects the first DC terminal M21 and the second DC terminal M22. The diodes M2a and M2b connected in series are arranged in the wiring ML7. The intermediate position Mab between the diode M2a and the diode M2b is connected to the first AC terminal M11 of the AC terminal side portion M1.
The wiring ML8 connects the first DC terminal M21 and the second DC terminal M22. The diodes M2c and M2d connected in series are arranged in the wiring ML8. The intermediate position Mcd between the diode M2c and the diode M2d is connected to the second AC terminal M12 of the AC terminal side portion M1.
The wiring ML9 connects the first DC terminal M21 and the second DC terminal M22. The diodes M2e and M2f connected in series are arranged in the wiring ML9. The intermediate position Mef between the diode M2e and the diode M2f is connected to the third AC terminal M13 of the AC terminal side portion M1.

In the example shown in FIGS. 4 and 5, the DC terminal side portion M2 includes diodes M2a to M2f, and the converter control unit M3 includes multipliers M3a, M3b, and M3c described later, so that the three-phase inverter The instantaneous value analysis device 1 can analyze the instantaneous value of the three-phase inverter when the three-phase inverter performs a gate block.

As described above, in the examples shown in FIGS. 1 and 2, the converter control unit M3 includes the phase detector M31, the AC current command value calculation unit M32, the AC current command value calculation unit M33, and the phase correction amount calculation. A unit M34 and a phase correction amount addition unit M35 are provided.
On the other hand, in the examples shown in FIGS. 4 and 5, the converter control unit M3 includes a phase detector M31, an AC current command value calculation unit M32, an AC current command value calculation unit M33, and a phase correction amount calculation unit M34. , A phase correction amount addition unit M35 and multipliers M3a, M3b, and M3c are provided. _{A signal S SW} indicating the operating state of the three-phase inverter is input to the multipliers M3a, M3b, and M3c. When the three-phase inverter is operating while switching, the signal S _SW = 1 is input to the multipliers M3a, M3b, and M3c. In the gate block of the three-phase inverter, the signal S _SW = 0 is input to the multipliers M3a, M3b, and M3c.

In the examples shown in FIGS. 4 and 5, the multiplier M3a _{switches the command value i u} ^* of the alternating current input to the three-phase inverter main circuit MM based on _{the signal S SW.} When the signal S _SW = 1 is input to the multiplier M3a, the AC current command value i _u ^* calculated by the AC current command value calculation unit M33 is multiplied by 1 (that is, the AC current command value i _u). ^* ) Is input to the three-phase inverter main circuit MM. As a result, the current source M14 injects an alternating current into the alternating current terminal side portion M1 based on _{the command value iu} ^*. On the other hand, when the signal S _SW = 0 is input to the multiplier M3a, the AC current command value i _u ^* calculated by the AC current command value calculation unit M33 is multiplied by zero (that is, the value of zero). , Input to the three-phase inverter main circuit MM. As a result, the current source M14 does not inject the alternating current into the alternating current terminal side portion M1. That is, the multiplier M3a blocks the command value _i ^{u *} of the input to the current source M14.
The multiplier M3b _{switches the command value iv} ^* of the alternating current input to the three-phase inverter main circuit MM based on _{the signal S SW.} If the signal S _{SW = 1} is input to the multiplier M 3 b, the command value of the alternating current calculated by the alternating current command value calculating portion M33 i _v ^* to multiplication 1 (that is, the AC current command value i _v ^* ) Is input to the three-phase inverter main circuit MM. On the other hand, if the signal S _{SW = 0} is input to the multiplier M 3 b, multiplied by the zero command value i _v ^* of the alternating current calculated by the alternating current command value calculating section M33 (i.e., zero value) is , Input to the three-phase inverter main circuit MM.
The multiplier M3c _{switches the command value i w} ^* of the alternating current input to the three-phase inverter main circuit MM based on _{the signal S SW.} When the signal S _SW = 1 is input to the multiplier M3c, the AC current command value i _w ^* calculated by the AC current command value calculation unit M33 is multiplied by 1 (that is, the AC current command value i _w). ^* ) Is input to the three-phase inverter main circuit MM. As a result, the current source M15 injects an alternating current into the alternating current terminal side portion M1 based on _{the command value i w} ^*. On the other hand, when the signal S _SW = 0 is input to the multiplier M3c, the AC current command value i _w ^* calculated by the AC current command value calculation unit M33 is multiplied by zero (that is, the value of zero). , Input to the three-phase inverter main circuit MM. As a result, the current source M15 does not inject the alternating current into the alternating current terminal side portion M1. That is, the multiplier M3c blocks the input _{of the command value i w} ^{* to the current source M15.}

In the examples shown in FIGS. 4 and 5, when the values of the command values i _u ^* , _iv ^* , and i _w ^* input to the three-phase inverter main circuit MM are zero, the current source M14 of the AC terminal side M1 The current flowing through M15 becomes zero. That is, in this case, only the diodes M2a to M2f of the three-phase inverter main circuit MM shown in FIG. 4 remain substantially. The state in which only the diodes M2a to M2f of the three-phase inverter main circuit MM remains substantially corresponds to a gate-blocked three-phase inverter.
That is, in the examples shown in FIGS. 4 and 5, the operation of the three-phase inverter in the gate block can be simulated by inputting the _{signal S SW = 0 to the multipliers M3a, M3b, and M3c.}

(Third Embodiment)
Hereinafter, the three-phase inverter instantaneous value analysis device 1 of the third embodiment will be described. The three-phase inverter instantaneous value analysis device 1 of the third embodiment is configured in the same manner as the three-phase inverter instantaneous value analysis device 1 of the first embodiment, except for the points described later. Therefore, according to the three-phase inverter instantaneous value analysis device 1 of the third embodiment, the same effect as that of the three-phase inverter instantaneous value analysis device 1 of the first embodiment can be obtained except for the points described later.

FIG. 6 is a schematic configuration diagram of the three-phase inverter instantaneous value analysis device 1 of the third embodiment. In detail, FIG. 6A is a configuration diagram of the three-phase inverter main circuit MM of the three-phase inverter instantaneous value analysis device 1 of the third embodiment. FIG. 6B is a diagram showing a portion of the three-phase inverter main circuit MM shown in FIG. 6A that substantially remains during the switching operation of the three-phase inverter. FIG. 6C is a diagram showing a portion of the three-phase inverter main circuit MM shown in FIG. 6A that substantially remains at the time of gate blocking of the three-phase inverter. FIG. 7 is a detailed view of the converter control unit M3 and the like of the three-phase inverter instantaneous value analysis device 1 of the third embodiment.
As described above, in the examples shown in FIGS. 1 and 2, the DC terminal side portion M2 is the first DC terminal M21, the second DC terminal M22, the wiring ML5, the wiring ML6, the current source M23, and the voltage. A total of M24 and a capacitor M25 are provided.
On the other hand, in the example shown in FIGS. 6 and 7, the DC terminal side portion M2 is the first DC terminal M21, the second DC terminal M22, the wiring ML5, the wiring ML6, the wiring ML7, the wiring ML8, and the wiring. includes a ML9, a current source M23, voltmeter to detect the direct current voltage _{v dc} between the first DC terminal M21 and second DC terminals M22 (not shown), a capacitor M25, a diode M2a~M2f ing.

In the examples shown in FIGS. 6 and 7, the wiring ML7 connects the first DC terminal M21 and the second DC terminal M22. The diodes M2a and M2b connected in series are arranged in the wiring ML7. The intermediate position Mab between the diode M2a and the diode M2b is connected to the first AC terminal M11 via the switch MS1 of the AC terminal side portion M1.
The wiring ML8 connects the first DC terminal M21 and the second DC terminal M22. The diodes M2c and M2d connected in series are arranged in the wiring ML8. The intermediate position Mcd between the diode M2c and the diode M2d is connected to the second AC terminal M12 via the switch MS2 of the AC terminal side portion M1.
The wiring ML9 connects the first DC terminal M21 and the second DC terminal M22. The diodes M2e and M2f connected in series are arranged in the wiring ML9. The intermediate position Mef between the diode M2e and the diode M2f is connected to the third AC terminal M13 via the switch MS3 of the AC terminal side portion M1.

In the examples shown in FIGS. 6 and 7, the DC voltage is maintained in a state higher than the AC voltage by the DC voltage controller M32b during the switching operation of the three-phase inverter. Therefore, the diodes M2a to M2f are always in the off state. Therefore, the three-phase inverter main circuit MM shown in FIG. 6 (A) operates as the three-phase inverter main circuit MM shown in FIG. 6 (B). At this time, when viewed from the AC terminal side, the current sources M14, M15, and M23 appear.
In the examples shown in FIGS. 6 and 7, the current values output by the current sources M14, M15, and M23 become zero when the gate of the three-phase inverter is blocked. Therefore, as shown in FIG. 6C, of the three-phase inverter main circuit MM shown in FIG. 6A, only the diodes M2a to M2f remain substantially. The circuit shown in FIG. 6C is the circuit itself after the gate block in the actual machine of the three-phase inverter.
In the examples shown in FIGS. 6 and 7, the DC terminal side portion M2 includes the diodes M2a to M2f, and the converter control unit M3 includes the multipliers M3a, M3b, and M3c as in the second embodiment. Therefore, the three-phase inverter instantaneous value analyzer 1 can simulate the operation after the three-phase inverter shifts to the gate block, and obtains the instantaneous value of the three-phase inverter when the three-phase inverter performs the gate block. Can be analyzed.

As described above, in the examples shown in FIGS. 1 and 2, the AC current command value calculation unit M32 is the effective / ineffective power controller M32a.
On the other hand, in the examples shown in FIGS. 6 and 7, the AC current command value calculation unit M32 includes a DC voltage controller M32b, a calculation unit M32c, an reactive power controller M32d, and a calculation unit M32e.

In the examples shown in FIGS. 6 and 7, the DC voltage v _dc detected by the voltmeter M24 and the command value v _dc ^* of the DC voltage are input to the calculation unit M32c. Calculator M32c outputs from the DC voltage _{v dc} minus the command value _{v dc} ^* of the DC voltage (difference between the command value _{v dc} ^* of the DC voltage _{v dc} and the DC voltage), the DC voltage controller M32b .. DC voltage controller M32b, by performing the PI control, calculates d-q command value of the alternating current coordinate system _i ^d * a (d-axis component). That is, the DC voltage controller M32b is calculated based on the difference between the command value _{v dc} ^* of the DC voltage _{v dc} and the DC voltage command value of the alternating current in the d-q coordinate system _i ^d * a (d-axis component) To do. The command value _id ^* of the AC current in the dq coordinate system is input to the AC current command value calculation unit M33.
The command value q _ac ^* of the reactive power and the detected value q _ac of the reactive power are input to the calculation unit M32e. Calculator M32e is obtained by subtracting the detection value _{q ac} reactive power from the command value of the reactive power _{q ac} ^* (difference between the detection value _{q ac} of command value _{q ac} ^* and the reactive power of the reactive power), the reactive power Output to the controller M32d. Reactive power controller M32d, by performing the PI control, calculates d-q command value of the alternating current coordinate system _i ^q * the (q-axis component). That is, the reactive power controller M32d has _{a command value i q} ^* (q-axis component) of the alternating current in the d−q coordinate system based on the difference between _{the command value q ac} ^* of the reactive power and the detected value q _{ac of the reactive power.} ) Is calculated. The AC current command value i _q ^* in the dq coordinate system is input to the AC current command value calculation unit M33.

In the examples shown in FIGS. 6 and 7, the analysis model M narrows the frequency band to be simulated to a low frequency band close to the fundamental wave frequency. Therefore, in the examples shown in FIGS. 6 and 7, the calculation time step can be set larger than that in the example shown in FIG. 9, and the amount of calculation can be reduced.
In the examples shown in FIGS. 6 and 7, the command values calculated by the DC voltage controller M32b and the reactive power controller M32d are used by the current source M14 without performing current control or pulse width modulation (PWM). , M15 outputs to the AC terminal side M1. For the response in the low frequency band close to the fundamental frequency, it is considered that the output current can follow the current command value sufficiently well.

(Effects of the first to third embodiments)
FIG. 10 is a diagram showing steady-state characteristics and the like of the analysis model M of the first to third embodiments. Specifically, FIG. 10 shows the stationary characteristics of the analysis model M of the first to third embodiments in which the calculation time step is set to 600 μs, and the conventional analysis model shown in FIG. 8 in which the calculation time step is set to 1 μs. It is a figure which showed the steady-state characteristic of RM1 and the steady-state characteristic of another conventional analysis model RM2 shown in FIG. 9 in which a calculation time step was set to 40 μs.
The vertical axis of FIG. 10A shows the interconnection point line voltage (output voltage of the analysis model) [V] in the steady state of the analysis model. The vertical axis of FIG. 10B shows the interconnection point current (output current of the analysis model) [A] in the steady state of the analysis model. The vertical axis of FIG. 10C shows the interconnection point active power [pu] in the steady state of the analysis model. The vertical axis of FIG. 10D shows the interconnection point reactive power [pu] in the steady state of the analysis model. The vertical axis of FIG. 10 (E) shows the DC terminal voltage [V] in the steady state of the analysis model. The horizontal axis of FIGS. 10 (A) to 10 (E) indicates time.
As shown in FIGS. 10 (A), 10 (B), 10 (D), and 10 (E), the analysis model M of the first to third embodiments set to a value having a large calculation time step. Analysis model RM1 in which the interconnection point line voltage [V], the interconnection point current [A], the interconnection point reactive power [pu], and the DC terminal voltage [V] are set to values with a small calculation time step at regular times. , The interconnection point line voltage [V], the interconnection point current [A], the interconnection point reactive power [pu], and the DC terminal voltage [V] in the steady state of RM2 could be almost matched.

FIG. 11 is a diagram showing the characteristics of the analysis model M of the first to third embodiments at the time of sudden phase change. In detail, FIG. 11 shows the characteristics of the analysis model M of the first to third embodiments in which the calculation time step is set to 600 μs at the time of sudden phase change, and the conventional method shown in FIG. 8 in which the calculation time step is set to 1 μs. It is a figure which showed the characteristic at the time of a sudden phase change of the analysis model RM1 of the above, and the characteristic at the time of a sudden phase change of another conventional analysis model RM2 shown in FIG. 9 in which a calculation time step was set to 40 μs.
The vertical axis of FIG. 11A shows the interconnection dotted line voltage (output voltage of the analysis model) [V] when the phase of the analysis model suddenly changes. The vertical axis of FIG. 11B shows the interconnection point current (output current of the analysis model) [A] when the phase of the analysis model suddenly changes. The vertical axis of FIG. 11C shows the interconnection point active power [pu] at the time of sudden phase change of the analysis model. The vertical axis of FIG. 11D shows the interconnection point reactive power [pu] at the time of sudden phase change of the analysis model. The vertical axis of FIG. 11 (E) shows the DC terminal voltage [V] when the phase of the analysis model suddenly changes. The horizontal axis of FIGS. 11 (A) to 11 (E) indicates time.
In the example shown in FIG. 11, at time 0.4 [s], the power supply voltage was given a sudden phase change of 60 degrees.
As shown in FIGS. 11 (A) and 11 (B), after one power supply cycle has elapsed from the sudden change in phase, the series of analysis models M of the first to third embodiments set to a value having a large calculation time step. The interconnection point voltage [V] and the interconnection point current [A] are set to the interconnection point line voltage [V] and the interconnection point current [A] of the analysis models RM1 and RM2 in which the calculation time step is set to a small value. I was able to almost match.

FIG. 12 is a diagram showing the characteristics of the analysis model M of the second and third embodiments at the time of gate block. Specifically, FIG. 12 shows the characteristics of the analysis model M of the second and third embodiments in which the calculation time step is set to 600 μs at the time of gate block, and the conventional method shown in FIG. 8 in which the calculation time step is set to 1 μs. It is a figure which showed the characteristic at the time of the gate block of the analysis model RM1 of the above, and the characteristic at the time of the gate block of another conventional analysis model RM2 shown in FIG. 9 in which the calculation time step was set to 40 μs.
The vertical axis of FIG. 12A shows the interconnection dotted line voltage (output voltage of the analysis model) [V] at the time of gate block of the analysis model. The vertical axis of FIG. 12B shows the interconnection point current (output current of the analysis model) [A] at the time of gate block of the analysis model. The vertical axis of FIG. 12C shows the interconnection point active power [pu] at the time of gate block of the analysis model. The vertical axis of FIG. 12D shows the interconnection point reactive power [pu] at the time of gate blocking of the analysis model. The vertical axis of FIG. 12 (E) shows the DC terminal voltage [V] at the time of gate block of the analysis model. The horizontal axis of FIGS. 12 (A) to 12 (E) indicates time.
In the example shown in FIG. 12, the power supply voltage decreased by 90% in all three phases between the time 0.5 [s] and the time 0.6 [s]. The three-phase inverter detected a voltage drop, gate-blocked, and restarted after the voltage was restored.
As shown in FIGS. 12 (A), 12 (B), 12 (D), and 12 (E), the second and second values in which the calculation time step is set to a large value during the gate block and after the voltage is restored. The interconnection point line voltage [V], interconnection point current [A], interconnection point reactive power [pu], and DC terminal voltage [V] of the analysis model M of the third embodiment are set to values with a small calculation time step. It was possible to almost match the set analysis models RM1 and RM2 with the interconnection point line voltage [V], the interconnection point current [A], the interconnection point reactive power [pu], and the DC terminal voltage [V].

FIG. 13 is a diagram showing characteristics of the analysis model M of the first to third embodiments when the power supply voltage is lowered. In detail, FIG. 13 shows the characteristics of the analysis model M of the first to third embodiments in which the calculation time step is set to 600 μs when the power supply voltage is lowered, and FIG. 8 in which the calculation time step is set to 1 μs. It is a figure which showed the characteristic at the time of power supply voltage drop of the conventional analysis model RM1 and the characteristic at the time of power supply voltage drop of another conventional analysis model RM2 shown in FIG. 9 in which a calculation time step was set to 40 μs.
The vertical axis of FIG. 13A shows the interconnection dotted line voltage (output voltage of the analysis model) [V] when the power supply voltage of the analysis model drops. The vertical axis of FIG. 13B shows the interconnection point current (output current of the analysis model) [A] when the power supply voltage of the analysis model drops. The vertical axis of FIG. 13C shows the interconnection point active power [pu] when the power supply voltage of the analysis model drops. The vertical axis of FIG. 13D shows the interconnection point reactive power [pu] when the power supply voltage of the analysis model drops. The vertical axis of FIG. 13 (E) shows the DC terminal voltage [V] when the power supply voltage of the analysis model drops. The horizontal axis of FIGS. 13 (A) to 13 (E) indicates time.
In the example shown in FIG. 13, the power supply voltage decreased by 50% in all three phases between the time 0.5 [s] and the time 0.6 [s]. The three-phase inverter continued to operate in response to the requirements for continued operation in the event of an accident (FRT).
As shown in FIGS. 13 (A), 13 (B) and 13 (D), the first to third embodiments in which the calculation time step is set to a large value during the power supply voltage drop and after the voltage is restored. The interconnection dot line of the analysis models RM1 and RM2 in which the voltage [V], the interconnection point current [A], and the interconnection point ineffective power [pu] of the analysis model M are set to values having a small calculation time step. It was possible to almost match the inter-voltage [V], the interconnection point current [A], and the interconnection point reactive power [pu].

FIG. 14 is a diagram showing the characteristics of the analysis model M of the first to third embodiments when the system voltage drops by one phase. In detail, FIG. 14 shows the characteristics of the analysis model M of the first to third embodiments in which the calculation time step is set to 600 μs when the system voltage drops by one phase, and the case where the system voltage drops by one phase. The characteristics of the conventional analysis model RM1 shown in FIG. 8 in which the calculation time step is set to 1 μs, and the other conventional analysis model shown in FIG. 9 in which the calculation time step is set to 40 μs when the system voltage drops by one phase. It is a figure which showed the characteristic of RM2.
The vertical axis of FIG. 14A shows the interconnection dotted line voltage (output voltage of the analysis model) [V] of the analysis model when the system voltage drops by one phase. The vertical axis of FIG. 14B shows the interconnection point current (output current of the analysis model) [A] of the analysis model when the system voltage drops by one phase. The vertical axis of FIG. 14C shows the interconnection point active power [pu] of the analysis model when the system voltage drops by one phase. The vertical axis of FIG. 14D shows the interconnection point reactive power [pu] of the analysis model when the system voltage drops by one phase. The vertical axis of FIG. 14 (E) shows the DC terminal voltage [V] of the analysis model when the system voltage drops by one phase. The horizontal axis of FIGS. 14 (A) to 14 (E) indicates time.
In the example shown in FIG. 14, the power supply voltage decreased by 50% by one phase between the time 0.5 [s] and the time 0.6 [s].
As shown in FIGS. 14 (A), 14 (B) and 14 (D), the first to third embodiments in which the calculation time step is set to a large value during the power supply voltage drop and after the voltage is restored. The interconnection dot line of the analysis models RM1 and RM2 in which the voltage [V], the interconnection point current [A], and the interconnection point ineffective power [pu] of the analysis model M are set to values having a small calculation time step. It was possible to almost match the inter-voltage [V], the interconnection point current [A], and the interconnection point reactive power [pu].

FIG. 15 is a diagram showing the characteristics of the analysis model M of the first to third embodiments when the power generation output of the photovoltaic power generation facility connected to the three-phase inverter changes. In detail, FIG. 15 shows the characteristics of the analysis model M of the first to third embodiments in which the calculation time step is set to 600 μs when the power generation output of the photovoltaic power generation facility changes, and the power generation of the photovoltaic power generation facility. The characteristics of the conventional analysis model RM1 shown in FIG. 8 in which the calculation time step when the output changes are set to 1 μs, and the figure in which the calculation time step when the power generation output of the photovoltaic power generation facility changes is set to 40 μs. It is a figure which showed the characteristic of another conventional analysis model RM2 shown in 9.
The vertical axis of FIG. 15A shows the interconnection dotted line voltage (output voltage of the analysis model) [V] of the analysis model when the power generation output of the photovoltaic power generation facility changes. The vertical axis of FIG. 15B shows the interconnection point current (output current of the analysis model) [A] of the analysis model when the power generation output of the photovoltaic power generation facility changes. The vertical axis of FIG. 15C shows the interconnection point active power [pu] of the analysis model when the power generation output of the photovoltaic power generation facility changes. The vertical axis of FIG. 15D shows the interconnection point reactive power [pu] of the analysis model when the power generation output of the photovoltaic power generation facility changes. The vertical axis of FIG. 15 (E) shows the DC terminal voltage [V] of the analysis model when the power generation output of the photovoltaic power generation facility changes. The horizontal axis of FIGS. 15 (A) to 15 (E) indicates time.
In the example shown in FIG. 15, the amount of solar radiation of the photovoltaic power generation panel increases stepwise from 20% to 80% at time 0.4 [s] and from 80% to 20% at time 0.6 [s]. It decreased in steps.
As shown in FIGS. 15 (A), 15 (B), and 15 (D), the first to third values are set so that the calculation time step is large regardless of the change in the amount of solar radiation of the photovoltaic power generation panel. Of the analysis models RM1 and RM2 in which the interconnection point line voltage [V], the interconnection point current [A], and the interconnection point reactive power [pu] of the analysis model M of the embodiment are set to values having a small calculation time step. It was possible to almost match the interconnection point line voltage [V], the interconnection point current [A], and the interconnection point invalid power [pu].

FIG. 16 is a diagram showing the characteristics of the analysis model M of the second and third embodiments at the time of emergency stop of the three-phase inverter. Specifically, FIG. 16 shows the characteristics of the analysis model M of the second and third embodiments in which the calculation time step at the time of the emergency stop of the three-phase inverter is set to 600 μs, and the calculation time at the time of the emergency stop of the three-phase inverter. Characteristics of the conventional analysis model RM1 shown in FIG. 8 in which the step is set to 1 μs, and characteristics of the other conventional analysis model RM2 shown in FIG. 9 in which the calculation time step at the time of emergency stop of the three-phase inverter is set to 40 μs. It is a figure which showed.
The vertical axis of FIG. 16A shows the interconnection dotted line voltage (output voltage of the analysis model) [V] of the analysis model at the time of emergency stop of the three-phase inverter. The vertical axis of FIG. 16B shows the interconnection point current (output current of the analysis model) [A] of the analysis model at the time of emergency stop of the three-phase inverter. The vertical axis of FIG. 16C shows the interconnection point active power [pu] of the analysis model at the time of emergency stop of the three-phase inverter. The vertical axis of FIG. 16D shows the interconnection point reactive power [pu] of the analysis model at the time of emergency stop of the three-phase inverter. The vertical axis of FIG. 16E shows the DC terminal voltage [V] of the analysis model at the time of emergency stop of the three-phase inverter. The horizontal axis of FIGS. 16 (A) to 16 (E) indicates time.
In the example shown in FIG. 16, the three-phase inverter stopped urgently at time 0.5 [s].
As shown in FIGS. 16A, 16B, and 16D, the time has elapsed from the emergency stop of the three-phase inverter by one calculation time step of the analysis model M of the second and third embodiments. After that, the interconnection point line voltage [V], the interconnection point current [A], and the interconnection point reactive power [pu] of the analysis model M of the second and third embodiments set to the values having a large calculation time step. ] Can be approximately matched with the interconnection point line voltage [V], interconnection point current [A], and interconnection point reactive power [pu] of the analysis models RM1 and RM2 set to values with a small calculation time step. did it.

As described above, according to the three-phase inverter instantaneous value analysis device 1 of the first to third embodiments, the calculation time step is set larger than that of the conventional analysis models RM1 and RM2 to perform the analysis. Can be done. Specifically, the calculation time step required for the analysis model RM1 shown in FIG. 8 and 40 μs for the analysis model RM2 shown in FIG. 9 is set to 600 μs in the analysis model M of the first to third embodiments. be able to. Thereby, the calculation time can be shortened.
As described above, even when the calculation time step is about 600 μs in the analysis model M of the first to third embodiments, the three-phase inverter instantaneous value analysis device 1 calculates with a sufficiently small error in practical use. can do.

As described above, the three-phase inverter instantaneous value analysis device 1 of the first to third embodiments is a three-phase inverter instantaneous value analysis device 1 that analyzes the instantaneous value of the three-phase inverter by using the analysis model M. The analysis model M includes an AC terminal side portion M1 of the three-phase inverter main circuit MM, a DC terminal side portion M2 of the three-phase inverter main circuit MM, and a converter control unit M3 that controls the three-phase inverter main circuit MM. The AC terminal side portion M1 includes a DC current calculation unit M4, and is a current source M14 arranged in a wiring ML1 connecting the first AC terminal M11 and the second AC terminal M12, and the second AC terminal M12 and the second AC terminal M12. 3 A current source M15 arranged in the wiring ML2 connecting the AC terminal M13 is provided, and the DC terminal side portion M2 is a current arranged in the wiring ML5 connecting the first DC terminal M21 and the second DC terminal M22. The converter control unit M3 includes an AC current command value calculation unit M33, a phase detector M31, and a phase correction amount calculation unit M34, and the phase detector M31 has a DC voltage of the first DC terminal. It generated by input between the and M21 second DC terminals M22, and the voltage _{v uv} between the first AC terminal M11 and second AC terminals M12, a second AC terminal M12 third AC terminal _{The AC voltage phase θs is detected based on the voltage vvw} between the M13 and the AC voltage phase θs, and the phase correction amount calculation unit M34 calculates the phase correction amount 2πf Δt for correcting the AC voltage phase θs, and the AC current command value. _{The calculation unit M33 calculates the command value i u} ^* of the AC current and the command value i _w ^* of the AC current based on the total value (θs + 2πf Δt) obtained by adding the AC voltage phase θs and the phase correction amount 2πf Δt. and DC current calculating unit M4 is the command value _i ^{u *} and the voltage _v and the product _v uv _i ^{u *} with _uv, the command value _i ^{w *} and the voltage _v a product of the _{vw v} vw _i ^{w *} sum of (v _uv i _u ^* + v vw i _w ^* _{) is the product of the DC current i dc} injected by the third current source M23 _{and the voltage v dc} between the first DC terminal M21 and the second DC terminal M22 v _dc. The _{DC current i dc} is calculated so as to be equal to _{i dc} , the current source M14 injects an alternating current into the alternating current terminal side portion M1 based on _{the command value i u} ^{*, and the current source M15 is the command value i.} _{Based on w} ^* , an alternating current is injected into the alternating current terminal side portion M1, and the current source M23 injects a _{direct current idc.}

With this configuration, in the first to third embodiments, the calculation error can be suppressed even if the calculation time step is set large.

A program for realizing the function of the three-phase inverter instantaneous value analyzer 1 in the present invention is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read into a computer system and executed. The analysis may be performed by this. The term "computer system" as used herein includes hardware such as an OS and peripheral devices.
Further, the "computer system" shall also include a WWW system provided with a homepage providing environment (or display environment). Further, the "computer-readable recording medium" refers to a portable medium such as a flexible disk, a magneto-optical disk, a ROM, or a CD-ROM, or a storage device such as a hard disk built in a computer system. Furthermore, a "computer-readable recording medium" is a volatile memory (RAM) inside a computer system that serves as a server or client when a program is transmitted via a network such as the Internet or a communication line such as a telephone line. In addition, it shall include those that hold the program for a certain period of time.

Further, the program may be transmitted from a computer system in which this program is stored in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium. Here, the "transmission medium" for transmitting a program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line. Further, the above program may be for realizing a part of the above-mentioned functions. Further, it may be a so-called difference file (difference program) that can realize the above-mentioned function in combination with a program already recorded in the computer system.

Although the embodiments for carrying out the present invention have been described above using the embodiments, the present invention is not limited to these embodiments, and various modifications and substitutions are made without departing from the gist of the present invention. Can be added. For example, the modifications shown in this embodiment can be applied to other embodiments.

1 ... Three-phase inverter instantaneous value analyzer, M ... Analysis model, MM ... Three-phase inverter main circuit, M1 ... AC terminal side, M11 ... 1st AC terminal, M12 ... 2nd AC terminal, M13 ... 3rd AC terminal , M14 ... current source, M15 ... current source, M16 ... voltmeter, M17 ... voltmeter, ML1 ... wiring, ML2 ... wiring, ML3 ... wiring, ML4 ... wiring, MS1 ... switch, MS2 ... switch, MS3 ... switch, M2 ... DC terminal side, M21 ... 1st DC terminal, M22 ... 2nd DC terminal, M23 ... current source, M24 ... voltmeter, M25 ... condenser, ML5 ... wiring, ML6 ... wiring, ML7 ... wiring, ML8 ... wiring, ML9 ... wiring, M2a ... diode, M2b ... diode, Mab ... intermediate position, M2c ... diode, M2d ... diode, Mcd ... intermediate position, M2e ... diode, M2f ... diode, Mef ... intermediate position, M3 ... converter control unit, M31 ... Phase detector, M32 ... AC current command value calculation unit, M32a ... Effective / invalid power controller, M32b ... DC voltage controller, M32c ... Calculation unit, M32d ... Invalid power controller, M32e ... Calculation unit, M33 ... AC current command value calculation unit, M33a ... abc-dq inverse conversion unit, M34 ... phase correction amount calculation unit, M35 ... phase correction amount addition unit, M3a ... multiplier, M3b ... multiplier, M3c ... multiplier, M4 ... direct current Current calculation unit, RM1 ... Analysis model, L1 ... Reactor, L2 ... Reactor, L3 ... Reactor, C1 ... Condenser, C2 ... Condenser, C3 ... Condenser, M2A ... Transistor, M2B ... Transistor, M2C ... Transistor, M2D ... Transistor, M2E ... transistor, M2F ... transistor, RM2 ... analysis model, S1 ... switch, S2 ... switch, S3 ... switch, V1 ... voltage source, V2 ... voltage source, V3 ... voltage source

Claims (6)

It is a three-phase inverter instantaneous value analysis device that analyzes the instantaneous value of a three-phase inverter by using an analysis model.
The analysis model is
The AC terminal side of the three-phase inverter main circuit and
The DC terminal side of the three-phase inverter main circuit and
The converter control unit that controls the three-phase inverter main circuit and
Equipped with a DC current calculation unit
The AC terminal side is
The first current source arranged in the first wiring connecting the first AC terminal and the second AC terminal, and
A second current source arranged in the second wiring connecting the second AC terminal and the third AC terminal is provided.
The DC terminal side is
It is equipped with a third current source arranged in the third wiring that connects the first DC terminal and the second DC terminal.
The converter control unit
It is equipped with an AC current command value calculation unit, a phase detector, and a phase correction amount calculation unit.
The phase detector has a first voltage between the first AC terminal and the second AC terminal, which is generated when a DC voltage is input between the first DC terminal and the second DC terminal. And the second voltage between the second AC terminal and the third AC terminal, the AC voltage phase is detected.
The phase correction amount calculation unit calculates the phase correction amount for correcting the AC voltage phase, and then calculates the phase correction amount.
The AC current command value calculation unit calculates the first command value of the AC current and the second command value of the AC current based on the total value obtained by adding the AC voltage phase and the phase correction amount.
The DC current calculation unit
The product of the first command value and the first voltage,
The sum of the product of the second command value and the second voltage is
The DC current is calculated so as to be equal to the product of the DC current injected by the third current source and the third voltage between the first DC terminal and the second DC terminal.
The first current source injects an alternating current into the alternating current terminal side portion based on the first command value.
The second current source injects an alternating current into the alternating current terminal side portion based on the second command value.
The third current source injects the direct current.
Three-phase inverter instantaneous value analyzer. The AC current command value calculation unit
The dq coordinate system AC current command value calculation unit that calculates the third command value of the AC current in the dq coordinate system, and
The abc coordinate system AC current command value calculation unit for calculating the first command value and the second command value is provided.
The abc coordinate system AC current command value calculation unit
Based on the total value and the third command value
Calculate the first command value and the second command value.
The three-phase inverter instantaneous value analysis device according to claim 1. The dq coordinate system AC current command value calculation unit
Equipped with a DC voltage controller and an reactive power controller,
The DC voltage controller is
Based on the difference between the third voltage and the command value of the third voltage, the d-axis component of the third command value is calculated.
The reactive power controller is
The q-axis component of the third command value is calculated based on the difference between the ineffective power command value and the ineffective power detection value.
The three-phase inverter instantaneous value analysis device according to claim 2. The DC terminal side portion includes a first diode, a second diode, a third diode, a fourth diode, a fifth diode, and a sixth diode.
The first diode and the second diode are connected in series between the first DC terminal and the second DC terminal.
The third diode and the fourth diode are connected in parallel with the first diode and the second diode in series between the first DC terminal and the second DC terminal.
The fifth diode and the sixth diode are connected in parallel with the first diode and the second diode in series between the first DC terminal and the second DC terminal.
The intermediate position between the first diode and the second diode is connected to the first AC terminal.
The intermediate position between the third diode and the fourth diode is connected to the second AC terminal.
The intermediate position between the 5th diode and the 6th diode is connected to the 3rd AC terminal.
The converter control unit
A first multiplier that blocks the input of the first command value to the first current source, and
A second multiplier that blocks the input of the second command value to the second current source is further provided.
The three-phase inverter instantaneous value analysis device according to any one of claims 1 to 3. It is a three-phase inverter instantaneous value analysis method that analyzes the instantaneous value of a three-phase inverter by using an analysis model.
The analysis model is
The AC terminal side of the three-phase inverter main circuit and
The DC terminal side of the three-phase inverter main circuit and
The converter control unit that controls the three-phase inverter main circuit and
Equipped with a DC current calculation unit
The AC terminal side is
The first current source arranged in the first wiring connecting the first AC terminal and the second AC terminal, and
A second current source arranged in the second wiring connecting the second AC terminal and the third AC terminal is provided.
The DC terminal side is
It is equipped with a third current source arranged in the third wiring that connects the first DC terminal and the second DC terminal.
The converter control unit
It is equipped with an AC current command value calculation unit, a phase detector, and a phase correction amount calculation unit.
The first voltage between the first AC terminal and the second AC terminal generated by the phase detector when a DC voltage is input between the first DC terminal and the second DC terminal. And the step of detecting the AC voltage phase based on the second voltage between the second AC terminal and the third AC terminal.
A step in which the phase correction amount calculation unit calculates a phase correction amount for correcting the AC voltage phase,
A step in which the AC current command value calculation unit calculates the first command value of the AC current and the second command value of the AC current based on the total value obtained by adding the AC voltage phase and the phase correction amount.
The DC current calculation unit
The product of the first command value and the first voltage,
The sum of the product of the second command value and the second voltage is
A step of calculating the DC current so as to be equal to the product of the DC current injected by the third current source and the third voltage between the first DC terminal and the second DC terminal.
The first current source injects an alternating current into the alternating current terminal side portion based on the first command value, and the second current source injects an alternating current into the alternating current terminal based on the second command value. A step of injecting into the side and the third current source injecting the alternating current is included.
Three-phase inverter instantaneous value analysis method. A program that allows a computer to analyze the instantaneous value of a three-phase inverter by using an analysis model.
The analysis model is
The AC terminal side of the three-phase inverter main circuit and
The DC terminal side of the three-phase inverter main circuit and
The converter control unit that controls the three-phase inverter main circuit and
Equipped with a DC current calculation unit
The AC terminal side is
The first current source arranged in the first wiring connecting the first AC terminal and the second AC terminal, and
A second current source arranged in the second wiring connecting the second AC terminal and the third AC terminal is provided.
The DC terminal side is
It is equipped with a third current source arranged in the third wiring that connects the first DC terminal and the second DC terminal.
The converter control unit
It is equipped with an AC current command value calculation unit, a phase detector, and a phase correction amount calculation unit.
The first voltage between the first AC terminal and the second AC terminal generated by the phase detector when a DC voltage is input between the first DC terminal and the second DC terminal. And the step of detecting the AC voltage phase based on the second voltage between the second AC terminal and the third AC terminal.
A step in which the phase correction amount calculation unit calculates a phase correction amount for correcting the AC voltage phase,
A step in which the AC current command value calculation unit calculates the first command value of the AC current and the second command value of the AC current based on the total value obtained by adding the AC voltage phase and the phase correction amount.
The DC current calculation unit
The product of the first command value and the first voltage,
The sum of the product of the second command value and the second voltage is
A step of calculating the DC current so as to be equal to the product of the DC current injected by the third current source and the third voltage between the first DC terminal and the second DC terminal.
The first current source injects an alternating current into the alternating current terminal side portion based on the first command value, and the second current source injects an alternating current into the alternating current terminal based on the second command value. A program that causes the computer to perform a step of injecting an alternating current into a side portion and causing the third current source to inject the alternating current.

Images