JP3399691B2 - Power system stabilizer - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power system stabilizing device for stabilizing a wide range of plural power fluctuations or a single power fluctuation.

[0002]

2. Description of the Related Art FIG. 13 is a block diagram showing a main configuration of a power system stabilizing device as disclosed in, for example, Japanese Patent Application Laid-Open No. 5-83859, "Method of Stabilizing Generator by Fuzzy Theory". In FIG. 13, 11 is a controller designed for large disturbance, and 12 is a controller designed for small disturbance. The controller 12 designed for small disturbance is composed of a controller 12a that receives the deviation signal Δω of the generator rotation speed ω and a controller 12b that receives the deviation signal ΔP of the generator active power P. It Both the controller 12a and the controller 12b are controllers designed for small disturbances. Reference numeral 13 denotes a controller for cooperatively controlling the control operation amount U1 output by the controller 11 and the control operation amount U2 output by the controller 12. Reference numeral 14 is a voltage limiter circuit applied to a general power system stabilizing device that limits the final output U of the controller 13 so that the generator voltage does not exceed ± 5% of the rated voltage.

Next, the operation will be described. Controller 11 designed for large disturbances and controller 12 designed for small disturbances
Includes a deviation signal Δω of the generator rotation speed ω (the rotation speed of the generator rotor) ω, a deviation signal Δf of the generator frequency f, a deviation signal ΔP of the generator active power P, etc. Used. Further, the controller 11 designed for large disturbance and the controller 12 designed for small disturbance are both controllers for adjusting the phase and gain of the power system stabilizing device for large disturbance and small disturbance. The controller 11 for large disturbance outputs the control operation amount U1 from the function of the phase θ as shown in FIG. 14 and the function of the gain De as shown in FIG. On the other hand, the controller 12 designed for a small disturbance has a control operation amount U22 defined by the same function of the gain De as described above and a change ΔE of the generator active power P.
Control in which the control operation amount U22 is negative when P is positive and the control operation amount U22 is positive when the change amount ΔEP is negative is added with a control operation amount U21 defining a function as shown in FIG. The operation amount U2 is output. Next, the output U of the controller 13 for cooperatively controlling the control operation amount U1 and the control operation amount U2 is the controller when the deviation indicated by the deviation signal Δω of the generator rotational speed ω is large (in the case of large disturbance). 17 is adopted, and when the deviation indicated by the deviation signal Δω is small (in the case of a small disturbance), the control operation amount U2 output from the controller 12 is adopted. Defined from the membership function as shown in

[0004]

[Equation 1]

It is expressed as However, SU2 in FIG.
BU1 is a label of the membership function of the control area in the control operation amounts U2 and U1, respectively, μS and μB are grades of the labels SU2 and BU1, and Y1 and Y2 are adjustment parameters. Here, the output U of the controller 13 can be expressed by U = U1 + μS (U2-U1) from the relationship of μB = 1−μS. The output U of the controller 13 is input as an electric machine signal to an automatic voltage adjusting device (not shown) to control the excitation of the generator to suppress power fluctuations with respect to large and small disturbances.

[0006]

The conventional power system stabilizing device based on the above fuzzy theory determines the ratio of each output of the controller for large disturbance and the controller for small disturbance to large disturbance and small disturbance. Since it is configured to be determined by two types of labels, there is a problem in that it is complicated in terms of control, and it is difficult to adjust and change the function and deal with it as a hardware configuration. Further, it is provided only for the control of large disturbance and small disturbance, and it is not clear which shaking mode is dominant depending on the magnitude of the disturbance.

The present invention has been made to solve the above problems. For example, a first control for improving the braking force in the first power fluctuation mode (first frequency range) And the second power control mode of the second power fluctuation mode (second frequency range) for improving the braking force, it is possible to easily control the coordinating ratio of the respective outputs, and for the wide frequency range. Therefore, it is an object of the present invention to obtain a power system stabilizing device that can improve the stability of the generator.

[0008]

SUMMARY OF THE INVENTION The first aspect of the present invention, the rotational speed of the generator, active power, the fluctuation suppression effect on either the associated as an input signal power information signal power oscillation modes of a frequency better To adjust the phase of the power information signal so that
And a means for adjusting the gain, and are adjusted by these adjusting means.
Control that outputs a control manipulated variable based on the phase and gain
A plurality of means are provided for different power fluctuation modes (control device
1, 2), the power information signal is input, and the ratio of the control operation amount, which is the output of the plurality of control means, is determined and output based on the magnitude of the fluctuation of the generator detected from the input signal. An operation amount control means (sway determination circuit 3) for controlling the operation amount, and an addition means (adder 7) for cooperatively adding the control operation amount output from the plurality of control means in accordance with the operation amount by the operation amount control means. It is characterized in that it is configured to change the ratio of addition of the control operation amount which is the output of the plurality of control means based on the magnitude of the shaking detected from the input signal of the operation amount control means. Is.

A second aspect of the present invention, the rotational speed of the generator, active power, as fluctuation suppression effect on and power oscillation modes and the input signal <br/> power information signal associated with one of the frequency is improved Means for adjusting the phase of the power information signal and adjusting the gain
And the phase and gain adjusted by these adjusting means.
The control means that outputs the control operation amount based on
With multiple units for each shaking mode (control device 1, 2)
The input of the electric power information signal, the ratio of the control operation amount that is the output of the plurality of control means is determined based on the magnitude of the fluctuation of the generator detected from the input signal, and the output operation amount is controlled. Operation amount control means (motion determination circuit 3),
And an adder (adder 7) for cooperatively adding the control operation amount output from the plurality of control units according to the operation amount by the operation amount control unit, and the magnitude of the fluctuation detected from the input signal of the operation amount control unit. The ratio of the addition of the control operation amount, which is the output of the plurality of control means, which is changed based on
It is characterized by being configured so as not to change in the dead zone.

A third aspect of the present invention, the rotational speed of the generator, active power, as fluctuation suppression effect on and power oscillation modes and the input signal <br/> power information signal associated with one of the frequency is improved Means for adjusting the phase of the power information signal and adjusting the gain
And the phase and gain adjusted by these adjusting means.
The control means that outputs the control operation amount based on
With multiple units for each shaking mode (control device 1, 2)
The input of the electric power information signal, the ratio of the control operation amount that is the output of the plurality of control means is determined based on the magnitude of the fluctuation of the generator detected from the input signal, and the output operation amount is controlled. Operation amount control means (motion determination circuit 3),
And an adder (adder 7) for cooperatively adding the control operation amount output from the plurality of control units according to the operation amount by the operation amount control unit, and the magnitude of the fluctuation detected from the input signal of the operation amount control unit. The ratio of the addition of the control operation amount, which is the output of the plurality of control means, which is changed based on
It is characterized in that it is configured so as not to change in the dead zone and to change by setting a bias value at the threshold value of the dead zone.

According to a fourth aspect of the present invention, the plurality of control means in the first aspect, the second aspect or the third aspect of the invention are settled in a circuit having an excellent fluctuation suppressing effect for a certain power fluctuation mode. It is characterized by being configured.

[0012] The fifth invention, the rotational speed of the generator, active power, as fluctuation suppression effect on and power oscillation modes and the input signal <br/> power information signal associated with one of the frequency is improved Means for adjusting the phase of the power information signal and adjusting the gain
And the phase and gain adjusted by these adjusting means.
The control means that outputs the control operation amount based on
With multiple units for each shaking mode (control device 1, 2)
In addition, the operation amount for inputting the power information signal, frequency-separating the input signal, determining the ratio of the control operation amount which is the output of the plurality of control means based on the separation result, and controlling the output operation amount. The control means (sway determination circuit 33) and the addition means (adder 7) for cooperatively adding the control operation amount output from the plurality of control means according to the operation amount by the operation amount control means are provided, and the operation amount control is performed. It is characterized in that the ratio of the addition of the control manipulated variable which is the output of the plurality of control means is changed based on the result of frequency separation of the input signal of the means.

[0013] A sixth invention is the rotation speed of the generator, active power, as fluctuation suppression effect on and power oscillation modes and the input signal <br/> power information signal associated with one of the frequency is improved Means for adjusting the phase of the power information signal and adjusting the gain
And the phase and gain adjusted by these adjusting means.
The control means that outputs the control operation amount based on
With multiple units for each shaking mode (control device 1, 2)
In addition, the operation amount for inputting the power information signal, frequency-separating the input signal, determining the ratio of the control operation amount which is the output of the plurality of control means based on the separation result, and controlling the output operation amount. The control means (sway determination circuit 33) and the addition means (adder 7) for cooperatively adding the control operation amount output from the plurality of control means according to the operation amount by the operation amount control means are provided, and the operation amount control is performed. The input signal of the means is frequency-separated, and the ratio of addition of the control operation amount, which is the output of the plurality of control means for changing based on the separation result, is configured not to change in the dead zone. is there.

[0014] A seventh aspect of the invention, the rotational speed of the generator, active power, as fluctuation suppression effect on and power oscillation modes and the input signal <br/> power information signal associated with one of the frequency is improved Means for adjusting the phase of the power information signal and adjusting the gain
And the phase and gain adjusted by these adjusting means.
The control means that outputs the control operation amount based on
With multiple units for each shaking mode (control device 1, 2)
In addition, the operation amount for inputting the power information signal, frequency-separating the input signal, determining the ratio of the control operation amount which is the output of the plurality of control means based on the separation result, and controlling the output operation amount. The control means (sway determination circuit 33) and the addition means (adder 7) for cooperatively adding the control operation amount output from the plurality of control means according to the operation amount by the operation amount control means are provided, and the operation amount control is performed. The input signal of the means is frequency-separated and the ratio of the addition of the control operation amount, which is the output of the plurality of control means, which is changed based on the separation result, is not changed in the dead zone, and the threshold value of the dead zone is set. It is characterized in that a bias value is provided to change the value.

[0015] An eighth aspect of the invention, the rotational speed of the generator, active power, as fluctuation suppression effect on and power oscillation modes and the input signal <br/> power information signal associated with one of the frequency is improved Means for adjusting the phase of the power information signal and adjusting the gain
And the phase and gain adjusted by these adjusting means.
The control means that outputs the control operation amount based on
With multiple units for each shaking mode (control device 1, 2)
In addition, the operation amount for inputting the power information signal, frequency-separating the input signal, determining the ratio of the control operation amount which is the output of the plurality of control means based on the separation result, and controlling the output operation amount. A control means (sway determination circuit 33), and the selection means 34 selects the output of the plurality of control means based on the result of frequency separation of the input signal of the manipulated variable control means. It is what

[0016]

In the first aspect of the invention, the power information signal relating to any of the number of revolutions of the generator, the active power, and the frequency is input to the plurality of control means (control devices 1 and 2), and each control operation amount is Is output. Further, the power information signal is input to the operation amount control means (sway determination circuit 3), and the ratio of the control operation amount is determined and output based on the magnitude of the oscillation of the generator detected from the input signal. The operation amount to be controlled is controlled. The control operation amount is cooperatively added by the addition means (adder 7) according to the operation amount by the operation amount control means. The rate of addition of the control operation amount is changed based on the magnitude of the shaking detected from the input signal of the operation amount control means.

In the second invention, the number of revolutions of the generator,
A power information signal related to either active power or frequency is input to a plurality of control means (control devices 1 and 2) and each control operation amount is output. Further, the power information signal is input to the operation amount control means (sway determination circuit 3), and the ratio of the control operation amount is determined and output based on the magnitude of the oscillation of the generator detected from the input signal. The operation amount to be controlled is controlled. The control operation amount is cooperatively added by the addition means (adder 7) according to the operation amount by the operation amount control means. Further, the rate of addition of the control operation amount is changed based on the magnitude of the shaking detected from the input signal of the operation amount control means, but is not changed in the dead zone.

In the third invention, the number of revolutions of the generator,
A power information signal related to either active power or frequency is input to a plurality of control means (control devices 1 and 2) and each control operation amount is output. Further, the power information signal is input to the operation amount control means (sway determination circuit 3), and the ratio of the control operation amount is determined and output based on the magnitude of the oscillation of the generator detected from the input signal. The operation amount to be controlled is controlled. The control operation amount is cooperatively added by the addition means (adder 7) according to the operation amount by the operation amount control means. Further, the rate of addition of the control operation amount is changed based on the magnitude of the shaking detected from the input signal of the operation amount control means, but is not changed in the dead zone. Further, a bias value is set at the dead zone threshold value, and the addition rate of the control operation amount is changed by this bias value.

In the fourth aspect of the invention, the plurality of control means (control devices 1 and 2) are set and configured in a circuit having an excellent fluctuation suppressing effect with respect to a certain same power fluctuation mode.

In the fifth invention, the number of revolutions of the generator,
A power information signal related to either active power or frequency is input to a plurality of control means (control devices 1 and 2) and each control operation amount is output. Further, the power information signal is input to the operation amount control means (sway determination circuit 33) and frequency separated, the ratio of the control operation amount is determined based on the separation result, and the output operation amount is controlled. The control operation amount is cooperatively added by the addition means (adder 7) according to the operation amount by the operation amount control means. Further, the rate of addition of the control operation amount is changed based on the frequency separation result of the input signal of the operation amount control means.

In the sixth invention, the number of revolutions of the generator,
A power information signal related to either active power or frequency is input to a plurality of control means (control devices 1 and 2) and each control operation amount is output. Further, the power information signal is input to the operation amount control means (sway determination circuit 33) and frequency separated, the ratio of the control operation amount is determined based on the separation result, and the output operation amount is controlled. The control operation amount is cooperatively added by the addition means (adder 7) according to the operation amount by the operation amount control means. Further, the ratio of addition of the control operation amount is changed based on the frequency separation result of the input signal of the operation amount control means, but is not changed in the dead zone.

In the seventh invention, the number of revolutions of the generator,
A power information signal related to either active power or frequency is input to a plurality of control means (control devices 1 and 2) and each control operation amount is output. Further, the power information signal is input to the operation amount control means (sway determination circuit 33) and frequency separated, the ratio of the control operation amount is determined based on the separation result, and the output operation amount is controlled. The control operation amount is cooperatively added by the addition means (adder 7) according to the operation amount by the operation amount control means. Further, the ratio of addition of the control operation amount is changed based on the frequency separation result of the input signal of the operation amount control means, but is not changed in the dead zone. Further, a bias value is set at the dead zone threshold value, and the addition rate of the control operation amount is changed by this bias value.

In the eighth invention, the number of revolutions of the generator,
A power information signal related to either active power or frequency is input to a plurality of control means (control devices 1 and 2) and each control operation amount is output. Further, the power information signal is input to the operation amount control means (sway determination circuit 33) and frequency separated, the ratio of the control operation amount is determined based on the separation result, and the output operation amount is controlled. The outputs of the plurality of control means are selected by the selection means 34 based on the frequency separation result.

[0024]

【Example】

Example 1. Embodiment 1 of the present invention will be described below with reference to the drawings. First Embodiment FIG. 1 is a block diagram showing a main configuration of a power system stabilizing device according to a first embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a first power fluctuation mode with a power information signal (in this case, a deviation signal Δω of the generator rotation speed ω) relating to any of the generator rotation speed, active power, and frequency as an input signal. The phase is adjusted so that the fluctuation suppressing effect for the (frequency range A) is improved, and the control device serves as a control unit that outputs the control operation amount UA. Reference numeral 2 designates a second power fluctuation mode (frequency range B) with a power information signal (in this case, deviation signal ΔP of generator active power P) relating to any of the number of revolutions, active power and frequency of the generator as an input signal. ), The phase is adjusted so as to improve the fluctuation suppressing effect, and the control device serves as a control unit that outputs the control operation amount UB.
Reference numeral 3 denotes the control operation amount UA which is the output of the control device 1 and the control operation amount UB which is the output of the control device 2 from the magnitude D of the sway of the generator which is inputted with the deviation signal Δω and detected from the input signal.
Is a fluctuation determination circuit as a manipulated variable control means for controlling the manipulated variable UC that is determined and output. Reference numeral 5 is a subtractor for subtracting the control operation amount UB from the control operation amount UA, and 6 is an operation amount UC which is an output of the subtracter 5 and an output of the fluctuation determination circuit 3.
A multiplier 7 for multiplying the output of the multiplier 6 and the control operation amount U
It is an adder that adds B. 4 has a generator voltage of ±
The final output of this device, that is, the adder 7 should not exceed 5%.
Is a general voltage limiter circuit that limits the level of the output U of the.

The above frequency range differs depending on the plant and is determined by the fluctuation frequency of the electric power. For example, when the power fluctuation is a combination of cycle 1 (sec) and cycle 2 (sec), the frequency range A is cycle 1 (sec) and the frequency range B is cycle 2 (sec). Adjust phase and gain. Further, the frequency range A has a cycle
(Sec), the frequency range B may be a cycle of 1 (sec). The deviation signal ΔP of the generator active power P, the deviation signal Δω of the generator rotation speed ω, and the deviation signal Δf of the generator frequency f can be applied to the input signals of the control device 1 and the control device 2. Here, an example is given in which the deviation signal Δω is applied as an input signal of the control device 1 and the shaking determination circuit 3, and the deviation signal ΔP is applied as an input signal of the control device 2.

FIG. 2 is an explanatory view of the phase adjusting function of the control device 1. In the figure, θ1, θ2 and α2 are used for determining the phase so as to improve the fluctuation suppressing effect of the fluctuation frequency A. 3 is an explanatory diagram of a gain adjustment function of the control device 1. FIG.4 is a block diagram of a phase correction / gain characteristic circuit provided in the control device 1.

The control device 1 has a control circuit represented by a function as shown in FIGS. 2 and 3 in which the phase is adjusted so that the fluctuation suppressing effect on the frequency range A is improved, or a phase advance / delay as shown in FIG. Function (1 + T2 ・ S) / (1 + T1 ・
S), a phase advance / delay circuit 8a, an amplification circuit 8b, and a phase delay function 1 / (1 + T · S)
The phase correction / gain characteristic circuit 8 composed of c can be applied. Further, the control device 2 also has a frequency range B similar to the control device 1.
It is possible to apply each circuit in which the phase is adjusted so as to improve the fluctuation suppression effect.

Next, the operation will be described. Now, let us consider a case where a control circuit represented by a function as shown in FIGS. 2 and 3 is applied to the control device 1 and a general phase advance / delay circuit and an amplification circuit are applied to the control device 2. First, the control device 1
Detects the phase angle θ from the deviation signal Δω of the generator rotational speed ω to be controlled and the deviation ΔEω per unit time of the deviation signal Δω.

[0029]

[Equation 2]

The controller 1 then detects the detected phase angle and
The output UN is detected from the function shown in. Further, UG corresponding to the gain is detected from the magnitude of the change of the deviation signal Δω and the function as shown in FIG. 3, and the control operation amount UA of the control device 1 is UA = UG from the detected output UN and the gain UG.
It is input to the subtractor 5 as (UN-1).

Next, the control device 2, which controls the deviation signal ΔP of the generator active power P, controls the time constants T1 of the phase advance / delay function and the first-order delay function so that the fluctuation suppressing effect on the frequency range B is improved. The control operation amount UB of the circuit in which the gains of T2 and T3 and the amplifier circuit are adjusted is input to the subtracter 5 and the adder 7. Next, the fluctuation determination circuit 3 for controlling the magnitude D of fluctuation of the fluctuation detected from the deviation signal Δω of the generator rotational speed ω is a circuit having a function as shown in FIG.
An operation amount UC = 1 / Y that determines the ratio of A and the control operation amount UB
2 (D <Y2) and UC = 1 (D ≧ Y2) are input to the multiplier 6. Note that here, the range of D <Y2 is the straight line UC = 1
Although represented by / Y2, it can be represented by a curve. As a result, the final output U of the power system stabilizing device according to the first embodiment is the output U = UC (UA-, which is obtained by adding the output UC (UA-UB) of the multiplier 6 and the output UB of the control device 2 by the adder 7. UB)
+ UB, the ratio of the control operation amount UA which is the output of the control device 1 is large when the oscillation frequency of the generator is in the frequency range A, and the control device amount UB which is the output of the control device 2 is large in the case of the frequency range B. By such control, the effect of suppressing power fluctuation can be kept stable in a wide frequency range. The output U is input as an electric signal to an automatic voltage regulator (not shown) to control the output of the exciter and stabilize the generator.

Although the above description has been made for the case of the two types of power fluctuation modes, the same control can be performed for a plurality of power fluctuation modes, and the control by this configuration can be realized by an analog device or a digital device. Is.

Example 2. In the first embodiment described above, the fluctuation determination circuit 3 in FIG. 1 is composed of a circuit having a function as shown in FIG. 5, and the deviation signal Δω of the generator rotational speed ω to be controlled.
Is a slight fluctuation, the control operation amount UA from the control device 1
Is not zero and is output. Therefore, a signal on noise in the generator rotation speed (generator shaft vibration, shaft torsion vibration, etc.)
If a little overlaps, it will affect the control. Therefore, the second embodiment constitutes a circuit in which a dead zone E composed of a function as shown in FIG. 6 is provided in the fluctuation determination circuit 3 in FIG. 1, and the manipulated variables UC = 0 (D <Y1), UC = ( D-Y1) /
(Y2-Y1) (Y1 ≦ D ≦ Y2), UC = 1 (D ≧ Y
2) (Y1 and Y2 are adjustment parameters) are output so that the control operation amount UA from the control device 1 becomes zero in the case of slight fluctuation (D is smaller than Y1). That is, in the second embodiment, the ratio of addition of the control operation amount UA and the control operation amount UB changed based on the magnitude D of the shaking detected from the deviation signal Δω which is the input signal of the shaking judging circuit 3 is set to the dead zone. In the case of E, the change is not made so that the control is not adversely affected by noise in the case of slight fluctuation.

Example 3. In the above-described second embodiment, the output of the control device 1 due to the slight fluctuation can be made zero by the dead zone circuit configuration, but in the third embodiment, the output of the control device 1 is within the range of the fluctuation magnitude D of Y1 ≦ D ≦ Y2. Since the ratio of the control operation amount UA is small, the shaking determination circuit 3 is configured by a circuit having a function as shown in FIG. 7, and the operation amount UC = 0 (D <Y
1), UC = 1 / Y2 (Y1 ≦ D ≦ Y2), UC = 1
By outputting (D ≧ Y2), the shaking magnitude D becomes Y1.
The output ratio of the control device 1 in the range of ≤D≤Y2 is not reduced. That is, in the third embodiment, the ratio of the addition of the control operation amount UA and the control operation amount UB, which is changed based on the magnitude D of the shaking detected from the input signal of the shaking determination circuit 3, is not changed in the dead zone E. In addition, a bias value (deviation from the threshold value) is set at the threshold value of the dead zone E so as to be changed. Therefore, in the case of a slight fluctuation, noise does not adversely affect the control, and the ratio does not decrease, so that the control accuracy does not decrease.

Example 4. In the above-described first to third embodiments, the control device 1 and the control device 2 have their phases adjusted for different frequency ranges A and B, respectively. In the fourth embodiment, both the control device 1 and the control device 2 are adjusted in the frequency range C so that the fluctuation suppressing effect is improved. For the frequency range C, for example, the power fluctuation mode has a single cycle of 1 (s
ec), the phases of both the control devices 1 and 2 are adjusted so that the effect of suppressing the oscillation period 1 (sec) is improved, and the phase is adjusted as compared with the case of the control device alone (for example, only the control device 1). Adjust to improve the suppression effect. When the power fluctuation mode has a single cycle as described above, the adjustment operations are facilitated because both the control devices 1 and 2 need to adjust the phase within one frequency range.

Example 5. FIG. 8 is a block diagram showing a main configuration of a power system stabilizing device according to a fifth embodiment of the present invention. In FIG. 8, components corresponding to those shown in FIG. 1 are designated by the same reference numerals, and their description will be omitted. In FIG. 8, reference numeral 33 denotes a deviation signal Δω of the rotation speed ω of the generator, frequency separation is performed, and the control operation amount UA which is the output of the control device 1 and the control operation which is the output of the control device 2 are obtained from the separation result. It is a fluctuation determination circuit as an operation amount control means for controlling the operation amount UC that is output by determining the ratio of the amount UB.

Power fluctuations are not limited to one mode, but in most cases multiple modes occur. Above all, it is necessary to improve the effect of suppressing power fluctuation in the local mode (for example, the cycle is about 0.5 to 1.5 sec) and the long cycle mode (for example, the cycle is about 2.0 to 4.0 sec). Considering a case where the power fluctuation mode is a composite type of a cycle of 1.0 sec (content rate 60%) and a cycle of 2.0 sec (content rate of 40%), the control device 2 controls the power fluctuation of the cycle of 1.0 sec, for example. The phase and gain are adjusted so as to improve the braking force with respect to the mode, and the control device 1 adjusts the phase and gain so as to improve the braking force with respect to the power fluctuation mode having a cycle of 2.0 sec. The fluctuation determination circuit 33 frequency-separates the power fluctuation mode, obtains each frequency and content rate, and determines the ratio of the output of the controller 1 to 3/5 and the output of the controller 2 to 2/5. And the final output is the output 3/5 of the control device 1,
The output of the controller 2 is added to the adder 7 at a rate of 2/5. As a result, it is possible to improve the effect of suppressing the power fluctuation of the composite type having the cycle of 1.0 sec and the cycle of 2.0 sec.

Control device 1, control device 2, and motion determination circuit 3
The deviation signal ΔP of the generator active power P, the deviation signal Δω of the generator rotation speed ω, and the deviation signal Δf of the generator frequency f can be applied to the input signal of 3. As an example, the deviation signal Δω is applied as the input signal of the shaking determination circuit 33, and the deviation signal ΔP is applied as the input signal of the control device 2.

Next, the operation will be described. Now, let us consider a case in which a control circuit represented by a function as shown in FIGS. 2 and 3 is applied to the control device 1 and a general phase advance / delay circuit and an amplification circuit are applied to the control circuit 2. First, control circuit 1
Detects the phase angle θ from the deviation signal Δω of the generator rotational speed ω to be controlled and the deviation ΔEω per unit time of the deviation signal Δω.

[0040]

[Equation 3]

Then, the control circuit 1 detects the detected phase angle and
The output UN is detected from the function shown in. Further, UG corresponding to the gain is detected from the magnitude of the change of the deviation signal Δω and the function as shown in FIG. 3, and the control operation amount UA of the control device 1 is UA = UG from the detected output UN and the gain UG.
It is input to the subtractor 5 as (UN-1).

Next, the control device 2, which controls the deviation signal ΔP of the generator active power P, controls the time constants T1 of the phase advance / delay function and the first-order delay function so that the fluctuation suppressing effect on the frequency range B is improved. The control operation amount UB of the circuit in which the gains of T2 and T3 and the amplifier circuit are adjusted is input to the subtracter 5 and the adder 7. Next, frequency analysis is performed from the deviation signal Δω of the generator rotational speed ω, and the fluctuation determination circuit 33, which controls the weight K corresponding to the fluctuation frequency, is a circuit composed of a function as shown in FIG. And UC = 1 / Y2 (K <Y2), UC = 1 (K ≧ Y, which determines the ratio of the control operation amount UB and
2) is input to the multiplier 6. Although the range of K <Y2 is represented by the straight line UC = 1 / Y2 here, it may be represented by a curved line. As a result, the final output U of the power system stabilizing device of the fifth embodiment is the output UC (UA-UB) of the multiplier 6.
And the output UB of the controller 2 is added by the adder 7 to obtain the output U =
UC (UA-UB) + UB, and when the oscillation frequency of the generator is in the frequency range A, the ratio of the control operation amount UA, which is the output of the control device 1, is large, and in the case of the frequency range B, it is the output of the control device 2. By controlling such that the control operation amount UB is increased, it is possible to keep the effect of suppressing the power fluctuation in a wide frequency range stable.

Although the above description has been made for the case of two power fluctuation modes, the same control can be performed for a plurality of power fluctuation modes, and the control by this configuration is realized by an analog device or a digital device. It is possible.

Example 6. In the fifth embodiment, the fluctuation determination circuit 33 in FIG. 8 is configured by a circuit having a function as shown in FIG. 9, and the deviation signal Δ of the generator rotation speed ω to be controlled is set.
When the weight K corresponding to the fluctuation frequency obtained by frequency-dividing ω is small, the control operation amount UA from the control device 1 is not zero but is output. Therefore, if a signal on noise (such as shaft vibration and shaft torsion vibration of the generator) is superimposed on the generator rotational speed, the control is affected. Therefore, the sixth embodiment constitutes a circuit in which a dead zone E composed of a function as shown in FIG. 10 is provided in the shaking determination circuit 33 in FIG. 8, and the manipulated variables UC = 0 (D <Y1), UC = ( K-Y1) / (Y2-
Y1) (Y1 ≦ K ≦ Y2), UC = 1 (K ≧ Y2) (Y
By outputting adjustment parameters 1 and Y2, the weight corresponding to the shaking frequency is very small (K is smaller than Y1).
In this case, the control operation amount UA from the control device 1 is set to zero.

The above Y1 and Y2 are adjustment parameters that vary depending on each power fluctuation mode, and set the most optimal constants in each power fluctuation mode. Basic is Figure 9
And the setting is Y1 = 0.0, Y2 = 1.
Set to 0. When the ratio of the output of the control device 1 is halved, Y2 = 2.0. When the output of the controller 1 is set to zero when the weight K is small, Y1 = 0.1 or the like. However, the value of Y1 is changed depending on the magnitude of noise. It should be noted that the shaking magnitude D described in the first embodiment is obtained from the differential value (change amount per unit time) of the input signal such as the generator rotational speed and active power, the deviation signal, and the like. The weight K described in Example 6 is the result of frequency separation, and is determined from the content of each frequency.

As described above, in the sixth embodiment, the addition of the control operation amount UA and the control operation amount UB which are changed based on the weight K based on the frequency separation result detected from the deviation signal Δω which is the input signal of the shaking determination circuit 33. The ratio of is not changed in the dead zone E, and the control is not adversely affected in the case of slight fluctuation.

Example 7. In the sixth embodiment, the output of the control device 1 can be made zero when the weight K corresponding to the fluctuation frequency is small due to the dead zone circuit configuration, but in the seventh embodiment, the weight K corresponding to the fluctuation frequency is Y1. Since the ratio of the output UA of the control device 1 is small in the range of ≦≦ K ≦ Y2,
The shaking determination circuit 33 is composed of a circuit having a function as shown in FIG. 11, and its control operation amount U3 = 0 (K <Y1), U
3 = 1 / Y2 (Y1 ≦ K ≦ Y2), U3 = 1 (K ≧ Y
By outputting 2), the weight K corresponding to the fluctuation frequency does not decrease the ratio of the output of the control device 1 in the range of Y1 ≦ K ≦ Y2. That is, Example 7
Then, the deviation signal Δω which is the input signal of the fluctuation determination circuit 33
The ratio of the addition of the control operation amount UA and the control operation amount UB, which is changed based on the weight K based on the detected frequency separation result, is not changed in the dead zone E, and a bias value (threshold value) is set at the dead zone threshold value. (Deviation from) is set to change.

Example 8. In the fifth to seventh embodiments, the control device 1 is determined based on the result of frequency separation of the output of the control device 1 and the output of the control device 2 based on the deviation signal Δω of the generator rotation speed ω.
Is determined by the shaking determination circuit 33 and the manipulated variable UC is output. On the other hand, in the eighth embodiment, from the result of frequency separation based on the deviation signal Δω of the generator rotation speed ω, it is settled by the circuit excellent in the frequency range having the larger weight K corresponding to the fluctuation frequency. The output of the control device is selected by switching. That is, as shown in FIG.
If the oscillation frequency detected in 1 is within the frequency range A, the output UA of the control device 1 is selected by the selecting means 3.
If the vibration frequency is within the frequency range B, the output UB of the control device 2 is selected by the selection means 34. As a result, power fluctuation can be minimized with a simpler configuration.

[0049]

As described above, according to the first aspect of the present invention, the ratio of addition of the control operation amounts output from the plurality of control means is calculated based on the magnitude of the shaking detected from the input signal of the operation amount control means. Since it is configured to change, it is possible to realize a circuit that can determine the ratio of the control operation amount without requiring a complicated circuit,
You can easily control the proportion of cooperation depending on the magnitude of the sway,
As a result, it is possible to suppress the fluctuation in a wide frequency range and improve the stability of the generator.

According to the second aspect of the invention, the ratio of addition of the control operation amounts, which are the outputs of the plurality of control means, which are changed based on the magnitude of the fluctuation detected from the input signal of the operation amount control means, changes in the dead zone. Because it is configured not to let
It is possible to obtain the same effect as that of the invention described above, and it is possible to obtain the effect that it is possible to prevent the control from being adversely affected by noise when the vibration is minute.

According to the third aspect of the present invention, the ratio of addition of the control operation amount, which is the output of the plurality of control means, which is changed based on the magnitude of the fluctuation detected from the input signal of the operation amount control means, changes in the dead zone. In addition, since the bias value is set and changed by the threshold value of the dead zone, the same effect as that of the first invention can be obtained, and when the fluctuation is minute, the noise adversely affects the control. And the ratio does not decrease, so that it is possible to obtain the effect that the control accuracy does not decrease.

According to the fourth invention, the plurality of control means in the first, second, and third inventions are set up in a circuit having an excellent fluctuation suppressing effect for a certain power fluctuation mode. Therefore, in the case where the power fluctuation mode has a single cycle, it is sufficient to adjust the phases of a plurality of control means within one frequency range, and the adjustment work is facilitated.

According to the fifth aspect of the invention, the ratio of addition of the control operation amounts output from the plurality of control devices is changed based on the result of frequency separation of the input signal of the operation amount control device. It is possible to realize a circuit that can determine the proportion of control operation amount without requiring a complicated circuit, and easily control the proportion that cooperates according to the magnitude of the fluctuation, thereby suppressing fluctuation in a wide frequency range, The effect that the stability of the generator can be improved is obtained.

According to the sixth aspect of the present invention, the ratio of the addition of the control operation amount, which is the output of the plurality of control units, which frequency-separates the input signal of the operation amount control unit and changes it based on the separation result, in the dead zone. Since it is configured so that it does not change,
It is possible to obtain the same effect as that of the invention described above, and it is possible to obtain the effect that it is possible to prevent the control from being adversely affected by noise when the vibration is minute.

According to the seventh aspect of the present invention, the ratio of the addition of the control operation amount, which is the output of the plurality of control devices, which frequency-separates the input signal of the operation amount control device and changes it based on the separation result, in the dead zone. Since it is configured so as not to change and a bias value is provided at the threshold value of the dead zone to change the same, the same effect as that of the fifth invention is obtained, and when the fluctuation is minute, the control is performed by noise. It is possible to obtain an effect that the adverse effect is not caused and the control accuracy is not lowered because the ratio is not reduced.

According to the eighth aspect of the invention, the output of the plurality of control means is selected by the selection means on the basis of the result of frequency separation of the input signal of the operation amount control means. It is possible to easily realize a circuit that can determine the frequency, thereby suppressing fluctuations in a wide frequency range and improving the stability of the generator.

[Brief description of drawings]

FIG. 1 is a block diagram showing a main configuration of a power system stabilizing device according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of a phase adjustment function of a control device in the first embodiment or the fifth embodiment described below.

FIG. 3 is an explanatory diagram of a gain adjusting function of the control device in the first embodiment or the fifth embodiment described below.

FIG. 4 is a block diagram of a phase correction / gain characteristic circuit provided in the control device in the first embodiment or the fifth embodiment described below.

FIG. 5 is an explanatory diagram of a function included in the shaking determination circuit according to the first embodiment.

FIG. 6 is an explanatory diagram of a function included in the fluctuation determination circuit provided in the power system stabilizing device according to the second embodiment of the present invention.

FIG. 7 is an explanatory diagram of a function of a fluctuation determination circuit provided in the power system stabilizing device according to the third embodiment of the present invention.

FIG. 8 is a block diagram showing a main configuration of a power system stabilizing device according to a fifth embodiment of the present invention.

FIG. 9 is an explanatory diagram of a function included in the shaking determination circuit according to the fifth embodiment.

FIG. 10 is an explanatory diagram of a function included in the fluctuation determination circuit provided in the power system stabilizing device according to the sixth embodiment of the present invention.

FIG. 11 is an explanatory diagram of a function included in the fluctuation determination circuit provided in the power system stabilizing device according to the seventh embodiment of the present invention.

FIG. 12 is a block diagram showing a main configuration of a power system stabilizing device according to an eighth embodiment of the present invention.

FIG. 13 is a block diagram showing a main part configuration of a conventional power system stabilizing device.

FIG. 14 is an explanatory diagram of a phase function of a controller for large disturbance in the conventional example.

FIG. 15 is an explanatory diagram of a gain function of a controller for large disturbance in the conventional example.

FIG. 16 is an explanatory diagram of a function of a controller for small disturbance in the conventional example.

FIG. 17 is an explanatory diagram of a membership function in the above conventional example.

[Explanation of symbols]

1, 2 control device (control means), 3, 33 fluctuation determination circuit (manipulation amount control means), 4, 14 voltage limiter circuit,
5 subtractor, 6 multiplier, 7 adder, 8 phase correction
Gain characteristic circuit, 8a phase lead-delay circuit, 8b amplifier circuit, 8c first-order lag circuit, 11, 12, 12a, 12
b, 13 controller, 34 selection means.

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuhiro Morita 1-2 1-2 Wadazaki-cho, Hyogo-ku, Kobe Mitsubishi Electric Corporation Control Works (72) Inventor Masaru Shimomura 1-chome, Wadazaki-cho, Hyogo-ku, Kobe 1-2 Mitsubishi Electric Co., Ltd. Control Works (72) Inventor Kunitaka Matsushima 1-2-1 Wadazakicho, Hyogo-ku, Kobe Mitsubishi Electric Co., Ltd. Control Works (56) Reference JP-A-5-83859 ( JP, A) JP 64-74032 (JP, A) JP 59-230431 (JP, A) JP 61-280714 (JP, A) JP 8-168177 (JP, A) (58) ) Fields surveyed (Int.Cl. ⁷ , DB name) H02J 3/00-5/00

Claims (8)

(57) [Claims] 1. A rotational speed of the generator, active power, power information signal to fluctuation suppression effect on either the associated as an input signal power information signal power oscillation modes of the frequency is improved
With a means for adjusting the phase of the signal and a means for adjusting the gain.
Control based on the phase and gain adjusted by these adjusting means.
The control means for outputting the manipulated variable is set for each power fluctuation mode.
And a plurality of the control information, which is the output of the plurality of control means based on the magnitude of the sway of the power generator detected from the input signal, Operation amount control means for controlling the amount,
And an adding means for cooperatively adding the control operation amount output from the plurality of control means in accordance with the operation amount by the operation amount control means, and based on the magnitude of the shaking detected from the input signal of the operation amount control means. An electric power system stabilizing device configured to change a ratio of addition of control operation amounts output from a plurality of control means. 2. A rotational speed of the generator, active power, power information signal to fluctuation suppression effect on either the associated as an input signal power information signal power oscillation modes of the frequency is improved
With a means for adjusting the phase of the signal and a means for adjusting the gain.
Control based on the phase and gain adjusted by these adjusting means.
The control means for outputting the manipulated variable is set for each power fluctuation mode.
And a plurality of the control information, which is the output of the plurality of control means based on the magnitude of the sway of the power generator detected from the input signal, Operation amount control means for controlling the amount,
A control operation amount output from the plurality of control means is added according to the operation amount by the operation amount control means, and addition means is added, and changes based on the magnitude of the shaking detected from the input signal of the operation amount control means. A power system stabilizing device, characterized in that a ratio of addition of control operation amounts, which are outputs of the plurality of control means, is not changed in a dead zone. 3. A rotational speed of the generator, active power, power information signal to fluctuation suppression effect on either the associated as an input signal power information signal power oscillation modes of the frequency is improved
With a means for adjusting the phase of the signal and a means for adjusting the gain.
Control based on the phase and gain adjusted by these adjusting means.
The control means for outputting the manipulated variable is set for each power fluctuation mode.
And a plurality of the control information, which is the output of the plurality of control means based on the magnitude of the sway of the power generator detected from the input signal, Operation amount control means for controlling the amount,
A control operation amount output from the plurality of control means is added according to the operation amount by the operation amount control means, and addition means is added, and changes based on the magnitude of the shaking detected from the input signal of the operation amount control means. The addition ratio of the control operation amount which is the output of the plurality of control means is not changed in the dead zone, and a bias value is provided at the threshold of the dead zone to change the ratio. Power grid stabilization device. 4. The control means according to claim 1, wherein the plurality of control means are set up in a circuit having an excellent fluctuation suppressing effect with respect to a certain same power fluctuation mode. The power system stabilizing device according to item 3. 5. the generator speed, active power, either the associated power information signal to the input signal and to power the power information signal to fluctuation suppression effect is improved with respect to oscillation modes of the frequency
With a means for adjusting the phase of the signal and a means for adjusting the gain.
Control based on the phase and gain adjusted by these adjusting means.
The control means for outputting the manipulated variable is set for each power fluctuation mode.
A plurality of control operation amounts are input to the power information signal, the input signal is frequency-separated, the ratio of the control operation amount output from the plurality of control means is determined based on the separation result, and the output operation amount is controlled. An operation amount control means, and an addition means for cooperatively adding the control operation amount output from the plurality of control means in accordance with the operation amount by the operation amount control means,
A power system stabilizing device, characterized in that a ratio of addition of control manipulated variables which are outputs of the plurality of control means is changed based on a result of frequency separation of an input signal of the manipulated variable control means. 6. the generator speed, active power, power information signal to fluctuation suppression effect on either the associated as an input signal power information signal power oscillation modes of the frequency is improved
With a means for adjusting the phase of the signal and a means for adjusting the gain.
Control based on the phase and gain adjusted by these adjusting means.
The control means for outputting the manipulated variable is set for each power fluctuation mode.
A plurality of control operation amounts are input to the power information signal, the input signal is frequency-separated, the ratio of the control operation amount output from the plurality of control means is determined based on the separation result, and the output operation amount is controlled. An operation amount control means, and an addition means for cooperatively adding the control operation amount output from the plurality of control means in accordance with the operation amount by the operation amount control means,
It is characterized in that the ratio of the addition of the control operation amount, which is the output of the plurality of control units, which frequency-separates the input signal of the operation amount control unit and changes based on the separation result, is not changed in the dead zone. Power grid stabilization device. 7. A rotational speed of the generator, active power, power information signal to fluctuation suppression effect on either the associated as an input signal power information signal power oscillation modes of the frequency is improved
With a means for adjusting the phase of the signal and a means for adjusting the gain.
Control based on the phase and gain adjusted by these adjusting means.
The control means for outputting the manipulated variable is set for each power fluctuation mode.
A plurality of control operation amounts are input to the power information signal, the input signal is frequency-separated, the ratio of the control operation amount output from the plurality of control means is determined based on the separation result, and the output operation amount is controlled. An operation amount control means, and an addition means for cooperatively adding the control operation amount output from the plurality of control means in accordance with the operation amount by the operation amount control means,
The input signal of the manipulated variable control means is frequency-separated and changed based on the separation result. The ratio of addition of the control device amounts, which are the outputs of the plurality of control means, is not changed in the dead zone, and the dead zone is not changed. A power system stabilizing device characterized in that a bias value is set and changed by the threshold value of. 8. the generator speed, active power, either the associated power information signal to the input signal and to power the power information signal to fluctuation suppression effect is improved with respect to oscillation modes of the frequency
With a means for adjusting the phase of the signal and a means for adjusting the gain.
Control based on the phase and gain adjusted by these adjusting means.
The control means for outputting the manipulated variable is set for each power fluctuation mode.
A plurality of control operation amounts are input to the power information signal, the input signal is frequency-separated, the ratio of the control operation amount output from the plurality of control means is determined based on the separation result, and the output operation amount is controlled. And an operation amount control means for controlling the input signal of the operation amount control means based on a result of frequency separation of the input signal of the operation amount control means, and the selection means selects the output of the plurality of control means. Stabilizer.