JP3403601B2 - AC / DC conversion system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a DC power transmission system or a control device for an AC / DC conversion system used in a frequency converter, and in particular, one system of an AC / DC conversion system composed of multiple systems becomes abnormal and becomes locked. In the case of a failure, the present invention relates to a recovery method for returning to the multi-system operation again when the repair is performed and the abnormality disappears.

In order to strengthen wide area cooperation, a frequency conversion device using a thyristor and a direct current transmission device (HVDC) have been put into practical use, and a static var compensator (SVC) for stabilizing voltage has been put into practical use. There is. At present, the main application examples of power electronics to power systems are those using thyristors, but the application of self-excited converter technology using elements with a self-extinguishing function such as GTO (gate turn-off) thyristors. By doing so, the device can be made more compact. The control protection device of the frequency conversion device is a DDC that directly controls the converter by a microcomputer as actual equipment of HVDC.
(Digital direct control) is adopted. in this case,
In order to achieve high reliability, a two-series configuration is used as shown in FIG.

[0003]

2. Description of the Related Art FIG. 8 is a circuit diagram showing an example of a conventional AC / DC conversion system. In FIG. 8, the AC / DC conversion system includes a converter transformer 1, a thyristor converter 2, a DC reactor 3, and a gate. And a pulse generator 4. This AC / DC conversion system is a 12-phase control for controlling the ignition pulse of a valve according to the command values of the pole common controllers 5, 5 for controlling the interchange power of a plurality of AC / DC converters and the pole common controllers 5, 5. Each of the devices 6 and 6 has at least a dual system configuration, and each configuration operates asynchronously. The common pole control devices 5 and 5 each have a constant power control circuit 10 that receives a DC power detection value Pd and a DC power command value Pdp and calculates a DC current command value Idp, and each of the common pole control devices 5 and 5. The abnormality determination circuits 12 and 12 for detecting abnormality of the means and the sequence lock command of the own sequence are input, and when there is no sequence lock command and the result of the abnormality determination circuit 12 is normal, the DC current command value Idp is set. The transmission circuits 14 and 14 for transmitting to the other-series common pole control device 5 and the series lock command of the other system are input, and the exchanged data and the DC current command value calculated by each common control device 5, 5 are selected. Selection circuit 11, 11
And transmission circuits 15 and 15 for outputting the outputs of the selection circuits 11 and 11 as final DC current command values when the results of the abnormality determination circuits 12 and 12 are normal.

Further, the 12-phase control devices 6 and 6 receive the DC current detection value Id, the DC voltage detection value Vd, and the DC current command value Idp from the pole common control devices 5 and 5 to calculate the control angle. Control angle calculation circuits 20 and 20 and an abnormality determination circuit 23 for detecting an abnormality of each means inside the 12-phase control device,
23 and a sequence lock command of its own sequence are input, and if there is no sequence lock command and the results of the abnormality determination circuits 23, 23 are normal, the transmission circuit 26 that transmits the control angle to the partner 12-phase controller. , 26 and a series lock command of the partner series, exchanged data and each control angle computing device 2
Selection circuits 21 and 2 for selecting the calculated control angles of 0 and 20
1 and the phase control circuits 22 and 22 for generating firing pulses from the control angles output from the selection circuits 21 and 21, and the outputs of the firing pulses, the results of the abnormality determination circuits 23 and 23 are abnormal, or The transmission circuits 27 and 27 are provided for locking with a sequence lock command and restarting output with a reset command. In FIG. 8, 4 is a gate pulse generator,
13 and 24 are OR circuits, 25 is a hold circuit, 31 is A
Sequence lock determination circuit, 32 is B sequence lock determination circuit, 4
0 is a first-come-first-served circuit.

Next, the operation will be described. The constant power control circuit 10 in the common pole control device 5 determines the DC power detection value Pd.
Is equal to the normal DC power command value Pdp,
The constant power control calculation is performed and the current command value Idp 'is output. When the abnormality determination circuit 12 detects no abnormality in the device itself and the series lock command is not input, the current command value Idp ′ is transmitted to the other series via the transmission circuit 14.

The selection circuit 11 compares the data Idp 'exchanged in the A system and the B system with the calculation result of the own device, selects a small value and outputs it. However, when the lock command of the partner system is input to the selection circuit 11, the calculation result of the own device is selected and output without performing comparison. For example, when the B-series lock determination circuit 32 of the series-locking device 7 outputs a B-series lock command and the B-series lock command is input to the selection circuit 11, the selection circuit 11 outputs the calculation result of the constant power control circuit 10 in its own device. To do. The output Idp of the selection circuit 11 is
This is output when no abnormality such as a power supply abnormality, a CPU abnormality, an input / output unit circuit abnormality, or a transmission failure is detected by the abnormality determination circuit 12 and there is no sequence lock command.

A control angle calculation circuit 20 in the 12-phase controller 6
Performs a control angle calculation from the DC current detection value Id, the DC voltage detection value Vd, and the output (Idp) of the common pole control device 5, and outputs the control angle α ′. The hold circuit 25 outputs a signal when an abnormality is detected by the abnormality determination circuit 23 or there is a sequence lock command, and then holds the signal output.
When there is no signal from the input circuit from the hold circuit 25, the transmission circuit 26 turns on and transmits this control angle α ′ to another series.

The selection circuit 21 compares the data α ′ exchanged between the A system and the B system with the calculation result of the device itself, and selects the control angle such that the applied voltage of the valve becomes small. However, when the lock command of the partner system is input to the selection circuit 21, the calculation result of the own device is selected and output without performing comparison. The phase control circuit 22 generates an ignition pulse from the output α of the selection circuit 21 and outputs it. The hold circuit 25 outputs a signal when an abnormality is detected by the abnormality determination circuit 23 or there is a series lock command, and then holds the signal output. The transmission circuit 27 outputs the firing pulse when there is no signal from the input circuit from the hold circuit 25.

In the gate pulse generator 4, the first-arrival priority circuit 40 receives the firing pulse from the 12-phase control unit 6 of the A system and the B system, and sends the gate pulse to the thyristor converter 2 by the first-arriving firing pulse. give. In the sequence lock device 7, the A sequence lock determination circuit 31 outputs an A sequence lock command when an abnormal signal from each A system device is input. The B-series lock command determination circuit 32 outputs a B-series lock command when an abnormal signal from each B-system device is input.

As is clear from the above description, the electric power reference values given from the direct operation monitoring panel (not shown) are given to the A-series and B-series common pole control devices 5 and 5, respectively, which have exactly the same configuration. . In the common pole control devices 5 and 5, in addition to starting and stopping the converter, constant power control is performed so that the interchange power becomes the power reference value, and the DC current reference value to be given to the next 12-phase control devices 6 and 6 is obtained. . As the cooperation between the A series and the B series, the minimum value is selected by comparing the reference values of the mutual output DC currents so that the converter does not become an overcurrent when one of the systems fails. It is given as a DC current reference value to the phase controllers 6 and 6. The 12-phase control devices 6 and 6 perform basic control functions such as constant current control, constant voltage control, and constant margin angle control that require high speed, calculate the control angle at which the converter should operate, and calculate A series, B The firing timing corresponding to the control angle is instructed to the series gate control, respectively. Again, A
The values of the control angles calculated for the series and the B series are compared with each other. In the forward converter operation, a large control angle that lowers the DC voltage is selected so that the converter does not become an overcurrent, and in the reverse converter, A small control angle with a large margin is chosen so that the transducer does not fail to commutate. In the gate control, since the gate light signal is given to the optical thyristor according to the ignition timing command sent from the 12-phase control devices 6 and 6 of the A series and B series, the light ignition thyristor consequently follows the earlier ignition command. It will be fired. Therefore, the application of digital control enhances the continuous monitoring function, and the failure can be detected promptly. Moreover, even if one of the A-series and B-series fails, online disconnection is possible, and high reliability can be achieved. Also, the digitization can reduce the number of boards in half and enhance the continuous monitoring function. By doing so, high reliability can be achieved.

[0011]

In the conventional AC / DC conversion system described above, when any one of the double series becomes abnormal, the abnormal series becomes the output lock state. In this state, the abnormal device can be repaired. After repairing, it is necessary for the outputs of both systems to be almost the same in order to operate them in the double system again. In the conventional method, it is necessary to confirm that the outputs of the two systems match during normal operation. I couldn't do it.
For this reason, in order to operate the system in a double system again, the system that is operating normally must be stopped.
It was a serious problem.

The present invention has been made to solve the above problems, and in a multiple series AC / DC conversion system which operates asynchronously, enables recovery of a lock series while one series operates normally. It is an object of the present invention to provide a method for restoring an AC / DC conversion system capable of returning to the operation of the multiplex system again.

[0013]

According to a first aspect of the present invention, there is provided an AC / DC conversion system, in which an apparatus in any one of the series becomes abnormal and becomes abnormal.
When the device is repaired, the control angle of the 12-phase controller of the repaired series is compared with the control angle of the normally operating 12-phase controller of the other series, and when they match, of the repaired series
A coincidence confirmation judging means for outputting a coincidence confirmation signal indicating that the lock can be released is provided.

According to the second aspect of the invention, the lock device is controlled based on the output of the coincidence confirmation judging means.
Equipped with recovery setting means to automatically recover the locked series.

According to a third aspect of the present invention, a series lock device comprises:
A lock release traffic jam determining means is provided for inputting the coincidence confirmation signal and the sequence lock command, and detecting that the coincidence confirmation signal from the 12-phase control device does not come even after a lapse of a fixed time after the sequence lock is released.

According to a fourth aspect of the invention, the common control device is
If there is no sequence lock command for own system and the result of own device abnormality detection is normal, compare the direct current command value of own system with the direct current command value of other system, and output a match signal when they match. The sequence lock device includes a lock release determination unit that detects that the coincidence confirmation signals from the common pole control device and the 12-phase control device do not come even after a certain time has elapsed since the sequence lock command was released. To have.

According to a fifth aspect of the present invention, a common control device is
Input the DC current command value obtained by calculation, normally use the DC current command value as the output value, and when the series lock command is released, it will not be selected by the selection means in the pole common control device in the subsequent stage. A non-selection setting means for returning to a normal operation by a return command.

In a sixth aspect of the present invention, the 12-phase control device inputs the control angle obtained by calculation, and normally, the control angle is used as an output value. An output value (a control angle at which a large applied voltage is applied to the valve) that is not selected by the selection means in the phase control device,
The gate pulse generator shall be equipped with non-selective setting means for returning to normal operation by the pulse coincidence signal from the gate pulse generator, and the gate pulse generator shall confirm the coincidence of the ignition pulses input from both series, and confirm that both ignition pulses are coincident. For example, it is provided with pulse coincidence determination means for outputting a pulse coincidence signal.

According to a seventh aspect of the present invention, the sequence lock device inputs the pulse coincidence confirmation signal, outputs the return instruction, and detects that the pulse coincidence confirmation signal does not come even after a lapse of a certain period of time. Means are provided.

In the invention according to claim 8, the 12-phase control device locks the input of the ignition pulse of its own device when the own device is abnormal or there is a sequence lock command, and the gate pulse generator locks the pulse input lock. A pulse input lock determining means for releasing the pulse input lock command after outputting the command and receiving the pulse coincidence confirmation signal is provided, and when the gate pulse generator receives the pulse input lock command from the 12-phase control device, An input lock unit that does not accept a pulse input from the series is provided.

[0021]

[Embodiment]

Embodiment 1. FIG. 1 is a block diagram showing an embodiment of the present invention, and the same parts as those in FIG. 8 are designated by the same reference numerals and the description thereof is omitted. In the figure, when there is no abnormality in the own device and there is no lock command, 51 compares the control angle calculation result (control angle α ′) of the own device with the control angle calculation results of other series, and if they match, they match. A coincidence confirmation determination circuit that outputs a confirmation signal, 52 is an A-series restoration determination circuit that outputs an A-series restoration command when the coincidence confirmation signal is received from both of the two 12-phase control devices (A), and 53 is two When the coincidence confirmation signal is received from both of a certain 12-phase controller (B) B
A B-series restoration determination circuit that outputs a sequence restoration command, 54 is a flip-flop circuit as a restoration setting means for locking the ignition pulse when there is an abnormality in the device itself or when there is a lock instruction, and unlocking with the restoration command, Numeral 55 inputs its own device operation result (Idp ') and other series operation results, and normally outputs a small value, and outputs the own device operation result with a lock command of another system, and a return command of another system. Selection circuit that returns to normal operation due to
Input the calculation result of other series, select and output the value at which the applied voltage of the valve becomes small during normal operation, select and output the calculation result of own device with lock command of other series, and operate in normal mode by the return command of other series It is a selection circuit which returns to.

Next, the operation of the first embodiment will be described. In the AC / DC conversion system configured as described above, when there is no own device abnormality and there is no lock command, that is, there is an error in any device in the own sequence, but when it is repaired and returns to normal. When the output α ′ of the control angle calculation circuit 20 is compared with the calculation results of the other series, the coincidence confirmation signal m is output because they coincide with each other. There are two A-series restoration determination circuits 52.
When the coincidence confirmation signal is received from both of the phase controllers (A), the A-series restoration command n is output. When the flip-flop circuit 54 receives the restoration command n, the transmission circuit 27
Open the gate of and unlock the output of the ignition pulse.
Further, upon receiving the return command, the selection circuit 55 of the B-series common control device 5 and the selection circuit 56 of the B-series 12-phase control device 6 perform comparison selection output in the normal state. As a result, it is possible to restore the output of the lock series after matching the output of the series during normal operation, and then return to the dual system operation again.

As described above, according to the first embodiment, one system of the AC / DC conversion system composed of multiple systems becomes abnormal,
Even if the lock occurs, if the repair is carried out thereafter and the abnormality disappears, the coincidence confirmation judgment circuit 51 confirms the output coincidence with the series in normal operation, and the return command judgment circuit 52 (53).
A return command is output from. Therefore, when this return command is input, the flip-flop circuit 54 releases the output lock of the ignition pulse, and it is possible to return to the multiple system operation again.

Embodiment 2. FIG. 2 is a block diagram showing a second embodiment of the present invention. In the sequence lock device of the first embodiment (FIG. 1) described above, the unlocking traffic jam judging circuit 6 is provided.
1 and 62 are added. When the lock release traffic congestion determination circuit 61 (62) releases the sequence lock command and the match confirmation signal necessary for the return command output is not input even after a certain period of time, It outputs the request for the series lock command of.

Specifically, the unlocking traffic jam judging circuit 6
When the sequence lock command output from the sequence lock determination circuits 31 and 32 is released and there is no input of the coincidence confirmation signal from the coincidence confirmation determination circuit 51 even after a lapse of a certain time, 1 and 62 determine the unlocking congestion. , Outputs a request for a series lock command for the series. As a result, an abnormality that cannot be found can be detected by the abnormality determination of each device, and maintenance can be performed by re-locking the series.

Embodiment 3. FIG. 3 is a block diagram showing a third embodiment of the present invention, in which a coincidence confirmation circuit 65 is added to the pole common control device of the above-described second embodiment (FIG. 2), and there is no abnormality in its own device. Further, when there is no lock command, the DC current command value of its own device is compared with the DC current command values of other series, and if they match, a match confirmation signal is output. When the sequence lock command is released and no coincidence confirmation signal is input from the common pole control device and the 12-phase control device even after a certain period of time, the lock release traffic jam determination circuits 61 and 62 request the sequence lock command for the sequence. Is output.

Specifically, if there is no abnormality in the device itself and there is no lock command, the coincidence confirmation circuit 65 compares the direct current command value of its own device with the direct current command values of other series, and if they match, , And outputs a match confirmation signal. In the lock release traffic jam determination circuits 61 and 62, the sequence lock command output from the sequence lock determination circuits 31 and 32 is released, and no match confirmation signal is input from both the match confirmation circuits 51 and 65 even after a certain period of time. In this case, it is determined that there is a lock release traffic jam, and the request for the sequence lock command of the relevant sequence is output. As a result, it becomes possible to further limit the causes of defects.

Fourth Embodiment 4 is a block diagram showing a fourth embodiment of the present invention, in which a non-selection setting circuit 68 is added to the pole common control device of the second embodiment (FIG. 2) described above.

Specifically, the output (current command value) of the constant power control circuit 10 is input, and this input value is normally used as the output value, and the selection circuit 55 is selected when the series lock command is released.
Outputs a value that is not selected by (outputs the upper limit of the current command value), and returns to the normal time by a return command. As a result, after the lock command is released, the output value of the pole common control device 5 of the lock system becomes the same as the output value of the pole common control device of the sound system during the period in which the coincidence confirmation is performed by the 12-phase control device 6. As a result, the DC current command value output from both systems differs due to the detection error of the detection value used in the constant power control calculation of the common control devices 5 of both series, and the coincidence confirmation performed by the coincidence confirmation determination circuit 51 is not established. To prevent. In addition, since the direct current command values of both systems are the same, it is possible to limit the failure part when the coincidence confirmation is not established.

Embodiment 5. FIG. 5 is a block diagram showing a fifth embodiment of the present invention. In the 12-phase controller of the fourth embodiment (FIG. 4) described above, the non-selection setting circuit 70 and the gate pulse generator 4 are pulse coincidence determination. The circuit 71 is added.

Specifically, the non-selection setting circuit 70 inputs the output (control angle) of the control angle calculation circuit 20, and normally uses this control angle as an output value, and selects when a return command is input. A value not selected by the circuit 21 is output (a control angle to which a larger valve applied voltage is applied is output), and the pulse matching signal from the gate pulse generation circuit 4 returns to the normal time. As a result, after the return command is output, the firing pulses output from both series of 12-phase control devices match. The pulse coincidence determination circuit 71 inputs the ignition pulses output from the 12-phase control devices of both series, confirms the coincidence, and outputs a pulse coincidence signal if they coincide. As a result, it is possible to confirm the normal operation of the phase control circuit 6 and the interface between the 12-phase control device and the gate pulse generator.

Sixth Embodiment FIG. 6 is a block diagram showing a sixth embodiment of the present invention, in which the sequence lock device 7 of the fifth embodiment (FIG. 5) described above is provided with the return congestion determining circuits 75 and 76.
Is added.

Specifically, the return congestion judgment circuits 75 and 76
When the sequence recovery determination circuits 52 and 53 output a sequence recovery command, and the pulse coincidence confirmation circuit 71 does not input a pulse coincidence confirmation signal even after a lapse of a certain time, it is determined to be a return congestion and the sequence lock of the sequence is performed. Output the order request. As a result, it is possible to prevent the continuous operation of the pulse in the abnormal state to affect the operation of the sound system.

Embodiment 7. FIG. 7 is a block diagram showing a seventh embodiment of the present invention, and the sixth embodiment described above.
A pulse input lock command circuit 80 is provided in the 12-phase controller 6 (FIG. 6), and pulse input lock circuits 81 and 82 are provided in the gate pulse generator 4.

Specifically, the pulse input lock command circuit 8
0 outputs the pulse input lock command by the output of the flip-flop circuit 54, and cancels the output of the pulse input lock command by the pulse match signal from the pulse match determination circuit 71. When the pulse input lock circuit 81, 82 receives the pulse input lock command, it outputs the ignition pulse of the series to the first-come-first-served circuit 40. As a result, the ignition pulse from the lock sequence will not be accepted until the lock operation is completed and the recovery operation is completed, and it is possible to prevent the abnormal operation of the ignition pulse from being output, which may significantly affect the operation of the normal operation system. You can In the present invention, it is described that the output of the match confirmation determination circuit 51 operates the series lock device 7 to automatically unlock the lock. However, the present invention is not limited to this, and the output of the match confirmation circuit 51 Alternatively, a lamp may be turned on or a buzzer may be sounded so that the lock can be released manually after confirming the coincidence.

[0036]

[Effect] The AC / DC conversion system according to the first aspect of the invention is
A device in one of the series is abnormal and the abnormal device is repaired.
The 12-phase controller of the repaired series ,
Compare with the control angle of the 12-phase controller during normal operation of the other series, and when they match , unlock the repaired series.
Since the coincidence confirmation judging means for outputting a coincidence confirmation signal indicating that the system is ready is provided, even if one of the multiplex systems becomes abnormal and becomes locked, the operation of the multiplex system is resumed based on the coincidence confirmation signal. Is possible. As a result, unlike the conventional case, it is possible to stop the AC / DC conversion system to return to the multiplex system and stop the system from having a great influence on the power system.

According to the AC / DC conversion system of the second aspect of the present invention, the recovery setting means for automatically recovering the locked sequence is provided by controlling the locking device based on the output of the coincidence confirmation determining means. Therefore, since the lock is automatically released, it is possible to save the trouble of manually releasing the lock.

The AC / DC conversion system according to the third aspect of the present invention comprises lock release traffic jam determining means for detecting that the coincidence confirmation signal does not come from the 12-phase control device even after a lapse of a fixed time after the sequence lock is released. Therefore, if there is no abnormality in the failure series, the series lock command is also released, and if the output match confirmation with the series that is in normal operation is not performed even after a while, by locking the failure series again, It is possible to detect a failure that cannot be recovered due to an abnormality that cannot be found in the failure determination, and by making maintenance possible again, a safer recovery method can be achieved.

Since the AC / DC conversion system according to the invention of claim 4 is provided with the lock release judging means, the abnormality of the fault series disappears, the series lock command is released, and even after a while, the series is in normal operation. If the output matching is not confirmed, the failure series is locked again. Further, by providing the confirmation points for the coincidence confirmation on a device-by-device basis, it becomes easy to limit the causes of defects, and it is possible to provide a restoration method with improved maintainability.

In the AC / DC conversion system according to the fifth aspect of the present invention, when the series lock command is released, the output value (the upper limit value of the DC current command value) which is not selected by the selecting means in the pole common control device at the subsequent stage. Output) and the non-selection setting means for returning to the normal operation by the return command is provided, so by detecting the DC current command of both series as the output of the series during normal operation, the detection value used for constant power calculation is detected. There is no possibility that the DC current command value will be different in both series due to an error, and the output matching confirmation with the series in normal operation will not be established. Further, even if the outputs do not match, the restoration method can limit the defective portion.

Since the AC / DC conversion system according to the invention of claim 6 comprises the non-selection setting means for returning to the normal operation by the pulse coincidence signal from the gate pulse generator, the control angles of both series are controlled in the normal operation. By setting the control angle, the phase control circuit in the 12-phase control device and the interface between the 12-phase control device and the gate pulse generator can be confirmed, and a safer recovery method can be achieved.

According to the seventh aspect of the present invention, the AC / DC conversion system is provided with the return traffic jam judging means for detecting that the pulse coincidence confirmation signal does not come even after the elapse of a certain time after the output of the return command. It is possible to prevent the influence on the operation of the sound system by continuously outputting, and maintenance becomes possible.

Since the AC / DC conversion system according to the invention of claim 8 is provided with the pulse input lock judging means for canceling the pulse input lock command after receiving the pulse coincidence confirmation signal, the series in the locked state can be restored until it can be normally restored. It is possible to prevent the abnormal operation of the sound system from being affected by the output of the abnormal pulse by not accepting the firing pulse from the gate pulse.

[Brief description of drawings]

FIG. 1 is a connection diagram showing a first embodiment of the present invention.

FIG. 2 is a connection diagram showing a second embodiment of the present invention.

FIG. 3 is a connection diagram showing a third embodiment of the present invention.

FIG. 4 is a connection diagram showing a fourth embodiment of the present invention.

FIG. 5 is a connection diagram showing a fifth embodiment of the present invention.

FIG. 6 is a connection diagram showing a sixth embodiment of the present invention.

FIG. 7 is a connection diagram showing a seventh embodiment of the present invention.

FIG. 8 is a connection diagram showing a conventional example.

[Explanation of Codes] 1 transformer for conversion, 2 thyristor converter, 3 DC reactor, 4 gate pulse generator, 5 pole common control device, 6 12 phase control device, 7 series lock device, 8, 9
AC system, 10 constant power control circuit, 11 selection circuit,
12 abnormality determination circuit, 13 OR circuit, 14 transmission circuit, 15 transmission circuit, 20 control angle calculation circuit, 21 selection circuit, 22 phase control circuit, 23 abnormality determination circuit, 2
4 OR circuit, 25 hold circuit, 26 transmission circuit,
27 transmitter circuit, 31 A-series lock determination circuit, 32
B-series lock determination circuit, 51 Matching confirmation determination circuit, 52
A-series restoration judgment circuit, 53 B-series restoration judgment circuit, 5
4 flip-flop circuit, 55 selection circuit, 56 selection circuit, 61 A-series lock traffic jam judgment circuit, 62 B-series lock traffic jam judgment circuit, 65 coincidence confirmation circuit, 68 non-selection setting circuit, 70 non-selection setting circuit, 71 pulse coincidence judgment Circuit, 75 A series return congestion judgment circuit, 76 B series return congestion judgment circuit, 80 pulse input lock command circuit, 81 pulse input lock circuit, 82 pulse input lock circuit.

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H02M 7/155 H02J 3/36

Claims (8)

(57) [Claims] 1. A pole common control device for controlling the interchange power of a plurality of AC / DC converters, and a 12-phase control device for controlling the ignition pulse of a valve according to a command value of the pole common control device.
Each has at least a dual series configuration, and each configuration operates asynchronously, and an abnormal signal from the common pole control device and the 12-phase control device configured by the dual series is input to determine which of the abnormal signals of a certain series. When a line is input, the system is equipped with a series lock device that locks the series, and in the above-mentioned common pole control apparatus, the reference values of the direct currents that are the outputs of the series are compared and the minimum value is selected to select the direct current reference. The 12-phase controller outputs basic values such as constant current, electric voltage control, constant margin angle control, etc., and also calculates the control angle at which the converter should operate based on the DC current reference value. In the AC / DC conversion system that compares the control angle values calculated in the respective series and selects either the large control angle or the small control angle to control the firing pulse of each series, the device in any one of the above series is Abnormality and abnormal equipment is fixed.
If so, the control angle of the 12-phase controller of the repaired series is compared with the control angle of the 12-phase controller of the other series in normal operation, and when they match, the lock of the repaired series is locked.
An AC / DC conversion system, characterized in that it is provided with a coincidence confirmation judging means for outputting a coincidence confirmation signal indicating that it can be released . 2. The alternation system according to claim 1, further comprising a reset setting means for automatically restoring the locked series by controlling the series locking device based on the output of the coincidence confirmation judging means. Conversion system. 3. The sequence lock device inputs the match confirmation signal and the sequence lock command, and detects that the match confirmation signal from the 12-phase control device does not come even after a certain time has elapsed since the sequence lock was released. An AC / DC conversion system according to claim 1, further comprising lock release traffic jam determining means. 4. The common pole control device compares the direct current command value of its own device with the direct current command value of another system when there is no sequence lock command of its own device and the result of its own device abnormality detection is normal, The sequence lock device is provided with a coincidence confirmation means for outputting a coincidence signal when they coincide with each other, and the sequence lock device receives the coincidence confirmation signals from the common pole control device and the 12-phase control device even if a certain time has elapsed since the sequence lock command was released. 4. The AC / DC conversion system according to claim 3, further comprising lock release determination means for detecting that the vehicle has not come. 5. The pole common control device inputs a DC current command value obtained by calculation, and normally uses the DC current command value as an output value, and when the sequence lock command is released, the pole common control at the subsequent stage. 4. The alternator according to claim 3, further comprising non-selection setting means for setting an output value (upper limit value of the direct current command value) that is not selected by the selecting means in the control device and returning to a normal operation by a return instruction. Conversion system. 6. The 12-phase control device inputs a control angle obtained by calculation, and normally uses the control angle as an output value, and when a return command is input, the selection in the 12-phase control device in the subsequent stage. An output value that cannot be selected by any means (a control angle at which a large applied voltage is applied to the valve) is set, and non-selection setting means for returning to normal operation by a pulse coincidence signal from the gate pulse generator is provided. 6. The apparatus according to claim 5, further comprising pulse coincidence determination means for confirming the coincidence of the ignition pulses input from both series and outputting a pulse coincidence signal if both the ignition pulses coincide. AC-DC conversion system. 7. The series lock device is provided with a return traffic jam judging means for inputting a pulse coincidence confirmation signal and detecting that a pulse coincidence confirmation signal does not come even after a predetermined time has elapsed since a return instruction was output. The AC / DC conversion system according to claim 6, wherein: 8. The 12-phase control device has an abnormality of its own device, or
With the sequence lock command, the gate pulse generator locks the input of the ignition pulse of its own device, so the pulse input lock command is output, and the pulse input lock command is released after receiving the pulse matching confirmation signal. 8. The gate pulse generator includes an input lock unit that does not accept a pulse input from the sequence when the gate pulse generator receives the pulse input lock command from the 12-phase control unit. The AC / DC conversion system described.