JP3028169B2 - Power converter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a large-capacity semiconductor power converter for general industry, electric power, vehicles and the like, and more particularly to a power converter for improving the reliability of a multiplex control system.

[0002]

2. Description of the Related Art In a forward power converter or a reverse power converter using a semiconductor switching element, the reliability of a power converter that controls converted power by detecting a DC side voltage, an AC side voltage, an AC side frequency, and the like. And multiplexing for the purpose of enhancing stability. As an example of this, a so-called parallel redundant synchronous operation in which a plurality of units are operated in parallel in consideration of a spare is disclosed in
There is a means disclosed in Japanese Patent Application Publication No. 0-102878. In Japanese Patent Application Laid-Open No. Sho 59-11782, a method is adopted in which the first pulse is generated from the control circuit in a triple manner, and an intermediate value in the triple is selected by majority logic.

[0003]

Problems to be Solved by the Invention JP-A-60-1028
In the technique disclosed in Japanese Patent Publication No. 78, there is a risk that the standby device may be temporarily interrupted when switching to a standby device in the event of an accident, or that all the inverter devices may be down due to a failure of the common oscillator.

In the example of JP-A-59-11782, the first pulse generating circuit is tripled, and the output of the tripled first pulse generating circuit is further reduced by the second pulse generating circuit. It is heavy. In this method, the triple system to be protected checks by a logical product and a logical sum in the hard part of the pulse state. There is a disadvantage that it is not possible to know whether the control part is abnormal or the hardware part is abnormal. Incomplete with respect to reliability.

It is an object of the present invention to provide a power conversion device which can quickly determine whether an abnormality has occurred in control information and which has improved reliability of a multiplex control system.

[0006]

In order to achieve the above object, the present invention provides a self-excited power converter comprising a self-extinguishing type semiconductor switching element and a self- excited power converter.
On the other hand, the power converter generates a command signal of active power and reactive power supplied to the AC system, and outputs a vector command signal from the output of the power command unit and the voltage and current detection signals of the AC system. a power conversion device and a control device including a pulse control unit for outputting a pulse width modulation control signal for controlling said self-turn-off semiconductor switching elements based on the output of the power control unit and said power control unit for outputting The control device is divided into three parts from the higher order to the lower order: the power command unit, the power control unit, and the pulse control unit, and the division unit is configured by a multiplex system , and the division unit of each system is input.
A computing unit that computes based on a force signal and stores the computation result, a determination unit that determines the content of the computation result of the computation unit, and mutually transmits the computation result of the computation unit between the computation unit of another system. And means for receiving, comprising means for transmitting a signal from the higher order to the lower order between the same system, the determination unit of each system,
The calculation result of the calculation unit of the own system and the calculation result of the calculation unit of the other system are
Compare and select the signal according to the operation result that is safe for operation.
To constitute a power conversion apparatus characterized by comprising output
Things .

[0007] In configuring the power converter,
The following elements can be added:

[0008] (1) The control device always has a multiplex system.
The parameters generated by one of the split components
Outputting a through-width modulation control signal;
If a failure occurs in any of the above,
The same as the normal element and the failed element
Pulse width modulation control signal generated from different system elements
Output.

(2) The split component is a double system. Your
Output signal.

(3) The power command unit and the power control unit are two
And the pulse control unit is a triple system, and the pulse control of the triple system is performed.
Input two different pulse width modulation control signals from the controller
And the pulse width change from the three logical products
Pulse width modulation control signal of one of the tone control signals
With one logical sum to select and output to the power converter
thing.

(4) Communication between the power command unit and the power control unit
Failure diagnosis function unit which transmits and receives signals and detects abnormality of the signal
The failure diagnosis function unit is a power command unit and a power control unit.
Operation unit that accumulates these signals, and abnormal output from the operation unit
And a judgment unit for detecting a failure.
Select the appropriate signal from the number of signals, and
Select the signal and instruct the path of the signal to the judgment unit of the force control unit.
When.

(5) The divided component is a micro computer
Power control unit and power control unit periodically
Performs sampling and calculation, and provides control information
The sampling and calculation cycle is controlled by the control information
The power command section shall be an integral multiple of the sampling and calculation cycle.
Control information from the power command unit to the power control unit during and
The information transmission is performed for each sampling of the power command unit,
Pulse control between the power control units and from the power control unit
Control information transmission to the power control unit
To do.

(6) Transmission of control information between power control units
Transmission and reception are performed alternately for each sampling.

[0014]

According to the present invention, the above-mentioned object is achieved by the following operation according to the present invention .

According to the present invention, the control device is arranged in the power command unit, the power control unit, and the pulse control unit from the upper to the lower of the control system.
It is divided and configured, and the divided configuration unit is configured in a multiplex system,
The division component of the system calculates based on the input signal and
The operation part that stores the operation result in the
The operation between a determining section for determining the volume, an operation unit of the other system
Means for mutually transmitting and receiving the operation results of the
It comprises means for transmitting to a lower signal from the upper between the systems, before
The judgment unit of each system calculates the operation result of the operation unit of the own system and the performance of the other system.
The operation result is compared with the operation result of the
Is configured to select and output the
Therefore, the calculation unit of each system can calculate the operation result that is safe for operation very quickly.
Can be selected. Therefore, the reliability of the control device can be improved. Furthermore, since the control device is divided into three parts, if a failure occurs, the entire series does not stop functioning, and the control parts other than the occurrence of the accident have a multiplexing function. In addition, it is possible to obtain a power converter in which the reliability of the control device is improved.

When digital control is performed by using a microcomputer, the calculation time of each division unit must be adjusted to match the calculation time.
The control information sampling and operation cycle of the power command unit was an integral multiple of the control information sampling and operation cycle of the power control unit. However, transmission of control information between the power control units and from the power control unit to the pulse control unit is performed at each sampling of the power control unit, and control information is exchanged within the required time between the divided constituent units, and appropriate control is performed. Since the information is selected and the control information is transmitted to the next control system, the control information can be checked at a speed corresponding to each control unit, and a power conversion device with improved control reliability can be provided.

[0017]

FIG. 5 shows an example of a system configuration in which a power converter is used. In the figure, an AC system 1 is a DC system 2
A self-excited power converter 3 that performs forward or reverse conversion and a transformer 4 are connected. The self-excited power converter includes a self-turn-off device or a thyristor such as a gate tan-off thyristor (hereinafter abbreviated as GTO) and a commutation auxiliary circuit.
The AC system 1 has an instrument transformer 5 for measuring the voltage and frequency of the AC system 1, the instrument current transformer 6 for measuring the current, and the DC system 2 has a DC voltage detector 7 for detecting voltage and a smoothing capacitor 8. It has. The reference command unit 9 includes a DC voltage,
A command such as an AC voltage or a frequency of the AC system 1 is given.
The reference command receiving unit 214 constituting the power command unit 210 of the control device receives the outputs of the instrument transformer 5, the instrument current transformer 6, and the DC voltage detector 7. In addition, the power control unit 212
The pulse control unit 213 transmits the pulse signal of the semiconductor switching element to the power conversion device 3 by taking the outputs of the instrument transformer 5 and the instrument current transformer 6 into the 3/2 phase conversion unit 215 constituting. When the control device is duplexed in order to enhance the reliability, the input signal to the control device is also sent to (B), and the output signal of the pulse control unit is output by the majority by the theoretical sum 124.

FIG. 1 is a diagram showing a first embodiment of the present invention. The power command unit (A) 10 receives data from the reference command unit 9 to the reference command receiving unit (A) 118. From the data of the reference command unit 9 and the voltage of the DC system 2 measured by the DC voltage detector 7, constant voltage processing is performed, and the reference command unit 9, the instrument transformer 5, and the instrument current transformer 6 are used. From the voltage, current, and frequency of the AC system 1 measured from, a constant voltage process, a constant current process, a constant frequency process, a phase control, and the like are performed to generate commands for the active power P and the reactive power Q. The measured voltage and current of the AC system 1 are converted from three phases to two phases by the 3/2 phase conversion (A) 11.

The power control unit (A) 12 performs vector control based on the commands of the active power P and the reactive power Q generated by the power command unit (A) 10 and the voltage and current obtained by converting three phases into two phases by 11. An operation is performed to generate a vector voltage command signal having two commands, a voltage command and a phase command.

The pulse control unit (A) 13 performs pulse width modulation (hereinafter abbreviated as PWM) from the vector voltage command signal.
Generated pulse. The PWM pulse is supplied as a signal of the semiconductor switching element of the power converter 3 and drives the power converter 3.

Power command section (A) 10, power control section (A)
12, a pulse control unit (A) 13 includes arithmetic units 100, 101, and 102 each having an arithmetic function such as a microcomputer and a memory function for storing data.
4 and 105, and judgment units 106, 107 and 108 for selecting and judging received data and transmitted data. Similarly,
The power command unit (B) 14, the power control unit (B) 16, and the pulse control unit (B) 17 constitute a double system for safety.

Power command section (A) 10 and power control section (A)
Between the blocks 12, there are a P and Q command transmitting section (A) 18 and a P and Q command receiving section (A) 19. Similarly, there are a P / Q command transmitting section (B) 20 and a P / Q command receiving section (B) 21. P,
In the Q command receiving section (A) 19, 19-1 receives data from the P and Q command transmitting section (A) 18, and 19-2 receives data from the P and Q command transmitting section (B) 20. .
In the receiving section (B) 21, 21-1 receives data from the P and Q command transmitting section (B) 20 and 21-2 receives data from the P and Q command transmitting section (A) 18. .

A PQ data transmitting / receiving section (A) 26 and a PQ data transmitting / receiving section (B) 27, a vector voltage data transmitting / receiving section (A) 28 and a vector voltage data transmitting / receiving section (B) 29,
The pulse data transmission / reception section (A) 30 and the pulse data transmission / reception section (B) 31 constitute a duplex system.

The power command section (A) 10 calculates an active power command P (A) and a reactive power command Q (A). The data transmission / reception unit (A) 26 transmits the PQ data P (A) and Q (A) of the power command unit (A) 10 to the PQ data transmission / reception unit (B) 27 and the PQ data of the power command unit (B) 14. P (B) and Q
(B) is received from the PQ data transmitting / receiving section (B) 27.

The determination unit 106 of the power command unit (A) 10 compares the P (A) data and the P (B) data and the Q (A) data and the Q (B) data stored in the memory of the arithmetic unit 100. It is assumed that data in a safe direction is selected. For example, data close to the command value of the reference command unit 9 is selected. Selected P,
The Q data is sent to the P and Q command receiving units (A) 19-1 and P, together with a data selection signal from the P and Q command transmitting unit (A) 18.
The data is transmitted to the Q command receiving section (B) 21-2. The function of power command unit (B) 14 is the same as that of power command unit (A) 10.

Next, the power control section (A) 12 will be described.

The power control unit (A) 12 basically has P,
The vector command is used to obtain a voltage command V (A) and a phase command θ (A) by performing a vector operation using the data of the Q command receiving unit (A) 19-1. Vector voltage data transmission / reception unit (A) 2
8 transmits the voltage command data V (A) and the phase command data θ (A) of the power control unit (A) 12 to the vector voltage data transmission / reception unit (B) 29 and the voltage command data of the power control unit (B) 16 V (B) and phase command data θ (B) are received from the vector voltage data transmitting / receiving section (B) 29.

The judgment unit 107 of the power control unit (A) 12 compares the V (A) data and V (B) data and the θ (A) data with the θ (B) data stored in the memory of the arithmetic unit 101. Data that is safer, for example, a value that reduces the voltage output. The selected vector voltage data is transmitted from the vector voltage command transmitting section (A) 22 to the vector voltage command receiving section (A) 23-1 and the vector voltage command receiving section (B) 25-2.

Similarly, the power controller (B) 16 basically performs a vector operation using the data of the P and Q command receivers (B) 21-2 to perform a voltage command V (B) and a phase command θ ( B)
Obtain the instruction of the instruction. Determination unit 1 of power control unit (B) 16
Numeral 16 compares the V (A) data and V (B) data stored in the memory of the arithmetic unit 110 and the θ (A) data with the θ (B) data to select data that is in a safe direction. The selected vector voltage data is transmitted to the vector voltage command transmitting unit (B) 2
4 to the vector voltage command receiving unit (B) 25-1 and the vector voltage command receiving unit (A) 23-2.

Next, the pulse control section will be described.

In the pulse control unit (A) 13, the judgment unit 1
08 selects the data of the vector voltage command receiving section (A) 23-1 and the calculating section 102 calculates the PWM pulse width.
The pulse data transmission / reception section (A) 30 transmits the PWM pulse data (A) to the PWM pulse data transmission / reception section (B) 31 and transmits the pulse data from the pulse data transmission / reception section (B) 31 to the PWM signal.
The pulse data (B) is received. For example, the judgment unit 108
Selects, from the PWM pulse data (A) and the PWM pulse data (B) stored in the memory of the arithmetic unit 102, data in which the pulse width in which the apparatus travels in a safer direction becomes narrower.
The pulse is transmitted to the WM circuit (A) 120 to generate a PWM pulse. Determination unit 108 outputs a [high] signals, the logic
In the product 121, the PWM generated in the PWM circuit (A) 120
Output pulse.

Similarly, in the pulse control section (B) 17, the judgment section 117 basically comprises a vector voltage command receiving section (A).
The arithmetic unit 111 selects the data of 25-2 and calculates the PWM pulse width. The pulse data transmitting / receiving unit (B) 31
The WM pulse data (B) is transmitted to the PWM pulse data transmitting / receiving section (A) 30 and the PWM pulse data (A) is received from the pulse data transmitting / receiving section (A) 30.
For example, the judging unit 117 selects data from the PWM pulse data (A) and the PWM pulse data (B) stored in the memory of the arithmetic unit 111 so that the pulse width of the device in the safer direction becomes narrower, and the PWM circuit (B) ) 122 to generate a PWM pulse.

Basically, the judgment unit 117 outputs a [low] signal, and the logical product 123 does not output the PWM pulse generated by the PWM circuit (B) 122.

The logical sum 124 is the logical product 121 and the logical product 12
In response to the signal of No. 3, the PWM pulse is transmitted to the power converter 3 as a signal of the semiconductor switching element. The power converter 3 can convert AC to DC or DC to AC according to the value of the reference command unit 9.

The operation described above is an explanation when the configuration and the operation of FIG. 1 are normal, but the feature of the present invention is, for example, that the power command unit (A) 10 has the P, Q command transmission unit (A) 18 In the power control unit (A) 12, a P and Q command receiving unit (A)
19-1 and 19-2, the power command unit (B) 14
In the power control unit (B) 16, the P and Q command receiving units (B) 21-1 and 2-1 are connected to the P and Q command transmitting unit (B) 20.
Normally, the data flow goes from 10 to 12 and from 14 to 16 because there are two of them.
Since it can be changed from 6 to 14 to 12 by the selection of the judgment unit, the reliability of the device system is improved.

In the power control units 12 and 16 and the pulse control units 13 and 17, the flow of data can be similarly changed, and an abnormality can be inspected in detail.

Next, a second embodiment will be described. FIG.
FIG. 4 is a detailed view of a second embodiment of the present invention. Elements that are the same as those in FIG. 1 and that are the same as those in FIG.

Here, similarly to the first embodiment, the power command section (A) 10 and the power command section (B) 14 constitute a double system, and the power control section (A) 12 and the power control section (B). ) 16 and 2
Although a pulse system is configured, a high-speed response is required for the pulse control unit 13, and the pulse control unit 13 is configured as a triple system for the purpose of improving hardware reliability. Power control unit (A) (B) and power command unit (A)
The operation of the data in (B) is the same as that in FIG.

The pulse control units 13-1, 13-2, 13
-3 is a triple system of three blocks, and received by a parallel port in order to speed up the reception of data from the host. Dual port RAM (A) 125 and dual port RAM
(B) 126 and a dual-port RAM (C) 127. Also, dual port RAMs 125-1, 126
-1 and 127-1 are DPRA of RAM for A system reception
M, dual port RAM 125-2, 126-2 and 1
27-2 is a DPRAM as a RAM for B-system reception.

Operation units 128, 129, and 13 for calculating the PWM pulse width of each block and storing the result data.
Judging units 131, 132, 133 for judging 0 and data
And PWM circuits 134, 135 and 136. 13-4
Is a majority circuit, and logical products 137, 138, and 139 are
It is composed of a logical sum 140.

The voltage command data V (A) and the phase command data θ (A) resulting from the vector operation of the power control unit (A) 12 are transmitted to the dual port RAMs 125-1, 126-1, and 127-1 of the pulse control unit. The voltage command data V (B) and the phase command data θ (B) of the vector operation result of the power control unit (B) 16 are stored in the dual port RAM 125 of the pulse control unit.
, 126-2, and 127-2. Judgment unit 1
The arithmetic units 128, 129, and 130 calculate the PWM pulse width based on the data from the power control unit (A) 12 and calculate the PWM pulse width based on the data from the power control unit (A) 12, and the PWM circuits 134, 135 , 136 to generate a PWM pulse. When data is abnormal, the operation unit 12
8, 129 and 130 calculate the PWM pulse width based on the data from the power control unit (B) 16 and
From 5, 136, a PWM pulse is generated. The reliability of the PWM pulse is improved by the majority circuit 13-4, and its output is transmitted to a semiconductor switching element of the power converter 3 to drive the power converter.

The judging units 131, 132, and 133 check their own operation data and change the PWM signal to [hig].
h] or only [low], and the abnormal circuit can be repaired.

Next, a third embodiment will be described. FIG.
FIG. 7 is a detailed view of a third embodiment of the present invention. The same elements as those in FIG. 2 are denoted by the same reference numerals. This embodiment is obtained by adding a failure diagnosis function to the second embodiment.

First, the failure diagnosis function unit 32 includes a diagnosis data transmission / reception unit (E) 37, an operation unit 38 capable of storing calculations and data, and a judgment unit 39. Also, the power command unit (A) 10, the power command unit (B) 14, and the power control unit (A)
The diagnostic data transmission / reception unit (A) 33 and the diagnostic data transmission / reception unit (B) which transmit / receive operation data of the control unit to / from the diagnosis data transmission / reception unit (E) 38 of the failure diagnosis function unit 32 are provided in the power control unit 12 and the power control unit (B) 16. ) 34 and the diagnostic data transmitting / receiving unit (C) 3
5 and a diagnostic data transmission / reception unit (D) 36, and transmission means between them is performed via transmission paths 40-1, 40-2, 40-3, and 40-4 such as optical communication.

The operation section 38 of the failure diagnosis function section 32 accumulates and sums up the operation data of each power control section and constantly checks for normality and abnormality. For example, data in the normal state is transmitted from 18 of the power command unit (A) 10 to 19-1 of the power control unit (A) 12 and from 22 to 125-1 of the pulse control unit 13-1.
Is transmitted to At this time, a flag for transmission is directly sent to the power command unit (A) 10 and the power control unit (A) 12,
The signal can be transmitted to the pulse controller 13-1 via the data bus of the power controller (A) 12. At the time of abnormality, control can be performed by sending a flag not to use the abnormal block. FIG. 4 shows a time chart of data transmission. In order to implement a duplex system, the data of the power command unit (A) and the data of the power command unit (B) are transferred to the PQ data transmitting / receiving unit (A).
26 and (B) 27 perform transmission and reception, and the data of the power control unit (A) and the data of the power control unit (B) are performed by the vector data transmission and reception units (A) 28 and (B) 29. At this time, serial transmission using optical transmission is performed to ensure data transmission without being affected by noise or the like. When the transmission speed of serial transmission is high, both PQ data transmission and reception and vector data transmission and reception can be performed for each sampling time of the power control unit, but sometimes the serial transmission time is long and the control operation time of the power control unit is prolonged. May occur. Originally, the calculation time of the power command unit (A) 10 may be several times longer than the calculation time of the power control unit (A) 12. Further, the earlier the transmission time for the data check of the power control unit is, the higher the reliability of the device is. Also, the data check may be slightly longer or intermittent as compared to the control calculation speed.

Therefore, as shown in FIG. 4, at the time of the sampling timer of the power control unit, the (B) system data of the (B) system power control unit 16 is transmitted from the vector voltage data transmission / reception unit (B) 29 to the vector voltage data transmission / reception unit. (A) 28
And stored in the memory of the arithmetic unit 101, and then transmitted this time with the previously accumulated (A) data (B)
Compare the system data and select the safer data from both.

Next, at the time of the sampling timer of the power control unit, the (A) system data of the (A) system power control unit 12 is transmitted from the vector voltage data transmission / reception unit (A) 28 to the vector voltage data transmission / reception unit (B) 29. Then, after similarly storing the data in the memory of the arithmetic unit 110, the (A) system data is compared with the previously stored (B) system data, and the safer data is selected from the two. In this way, by comparing the data of the (A) system and the data of the (B) system alternately, it is possible to obtain earlier abnormality information. The timing of data comparison can be performed using a soft timer.

Next, since the sampling time of the power command unit is several times longer than the sampling time of the power control unit, the time is long. Therefore, data transmission is performed for each sampling time of the power command unit. That is, the soft counter of the power command unit is counted up every sampling time of the power control unit. The counter is cleared at every arbitrary integral multiple. Each time this counter is cleared, it is determined as the period of the sampling time of the power command unit. The power command section transmits / receives PQ data between the PQ data transmission / reception section (A) 26 and the PQ data transmission / reception section (B) 27 at each sampling time, compares the PQ data, and selects more secure data, thereby controlling the control system. Stability and reliability are obtained.

[0049]

As described above, according to the present invention, the control device of the power converter is divided into three parts, a power command part, a power control part and a pulse control part, and each part is multiplexed. An operation unit and a judgment unit are provided in each part, data is exchanged for each part, data is compared and examined, and the same data is transmitted to a plurality of streams of the next part. Usually controlled by one series of data,
In the event of an accident, the judgment unit selects and controls a normal part of a plurality of systems, so that even if a defective part occurs, control can be performed avoiding that part, so that there is an effect that the reliability of the apparatus is improved.

Further, since it is possible to determine which part of the power converter has failed and what kind of failure has occurred, only the failed part is stopped, repaired, and restarted to ensure safety and reliability. You.

Thus, the control device is divided into three parts,
Multiplexing each greatly improves the reliability with respect to non-division multiplexing. For example, multiplexing has the effect of increasing the reliability six times as much as one.

By duplicating only the particularly important control part, for example, only the pulse control part, there is an effect that a reliable power converter can be provided without complicating the entire configuration.

A fault diagnosis function unit is provided for detecting abnormality and failure from the power command unit and the power control unit, which constitutes a dual system. Before the control unit fails, the system is pre-checked and the abnormal system is cut off. By repairing the abnormal system while operating in the normal system, and after repairing, operating in the dual system, the power converter can be operated stably without stopping.

Further, the data transfer of the power command section is performed at every sampling time of the power command section, and the abnormality and the appropriateness of the data are checked. At this time, since the data transfer time may be longer than the sampling time of the power control unit, the data cannot be checked for each sampling. Therefore, in order to increase the reliability, the data is transferred from the (B) system power control unit to the (A) system power control unit for the first time with respect to the sampling time of the power control unit. The data is compared, and the data is transferred from the (A) system power control unit to the (B) system power control unit for the next sampling time, and (B)
Compare and check the data of the system and the system (A), select better data and detect abnormalities earlier, improve the fault diagnosis function of the power converter, and improve the stability and reliability. Is generated.

[Brief description of the drawings]

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

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

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

FIG. 4 is a diagram showing a time chart of the present invention.

FIG. 5 is a diagram showing an example of a system configuration in which an embodiment of the present invention is used.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 AC system 2 DC system 3 Power converter 4 Transformer 5 Instrument transformer 6 Instrument current transformer 7 DC voltage detector 8 Smoothing capacitor 9 Reference command part 10 210 Power command part (A) 11 Three phase / 2 phase Conversion unit (A) 12 Power control unit (A) 13 Pulse control unit (A) 14 Power command unit (B) 15 3-phase / 2-phase conversion unit (B) 16 Power control unit (B) 17 Pulse control unit (B ) 18 P, Q command transmitting section (A) 19 P, Q command receiving section (A) 20 P, Q command transmitting section (B) 21 P, Q command receiving section (B) 22 Vector voltage command transmitting section (A) 23 Vector voltage command receiving section (A) 24 Vector voltage command transmitting section (B) 25 Vector voltage command receiving section (B) 26 PQ data transmitting / receiving section (A) 27 PQ data transmitting / receiving section (B) 28 Vector voltage data transmitting / receiving section ( A) 29 vectors Voltage data transmission / reception section (B) 30 pulse data transmission / reception section (A) 31 pulse data transmission / reception section (B) 32 failure diagnosis function section 33 diagnostic data transmission / reception section (A) 34 diagnostic data transmission / reception section (B) 35 diagnostic data transmission / reception section (C) 36 diagnostic data transmitting / receiving section (D) 37 diagnostic data transmitting / receiving section (E) 38 operating section of diagnostic section 39 determining section of diagnostic section 40-1, 40-2, 40-3, 40-4 diagnostic section transmission path 100-102, 109-111, 128-130 Arithmetic unit 106-108, 115-117, 131-133 Judgment unit 118, 119 Reference command receiving unit 120, 122, 134-136 Pulse width modulation circuit 103-105, 112- 114 Data bus 121, 123, 137 to 139 Logical OR 124, 140 Logical AND 210 Power command unit 212 Power control unit 2 3 pulse control unit 214 reference command 215 3-phase / 2-phase converter

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Hiroyasu Sato 3-1-1 Kochi-cho, Hitachi-shi, Ibaraki Hitachi, Ltd. Inside the Hitachi Plant (56) References JP-A-4-312323 (JP, A) JP-A-59-11782 (JP, A) JP-A-60-102878 (JP, A) JP-A-3-244001 (JP, A) JP-A-5-199763 (JP, A) JP-A-64-91654 ( JP, A) JP-A-64-91697 (JP, A) JP-A-3-203569 (JP, A) JP-A-57-193967 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , (DB name) H02M 7/42-7/98

Claims (7)

(57) [Claims] 1. A self-excited power converter comprising a self-extinguishing type semiconductor switching element, and a self-excited power converter .
A power command unit that generates a command signal of active power and reactive power supplied to the AC system by the power converter, an output of the power command unit, and a voltage and current detection signal of the AC system. a power conversion device and a control device including a pulse control unit for outputting a pulse width modulation control signal for controlling said self-turn-off semiconductor switching elements based on the output of the power control unit and said power control unit for outputting , wherein the control device is divided into three parts constituting the power instruction unit to the lower and the power control unit and a pulse control unit from the host, and divided components is constituted by multi-system, the division structure of each system input
An operation unit that performs an operation based on the signal and stores the operation result; a determination unit that determines the content of the operation result of the operation unit ;
Means for mutually transmitting and receiving the operation result of the operation unit with the operation unit of another system, and means for transmitting a signal from the upper system to the lower system between the same system, and the determination unit of each system includes , Indigenous
Comparing the operation result of the operation unit of one with the operation result of the operation unit of another system
Select and output a signal according to the operation result that is safe for operation
Power conversion apparatus characterized by and comprising. 2. The control device according to claim 1, wherein the control device is always operated by one of the multiplex system division components .
Outputs Pasuru width modulation control signals generated Ri, the 1-system
If one of the split components fails,
The normal elements of the one divisional component and the occurrence of a failure
Generated from the same element as the
A power converter characterized by outputting a width modulation control signal . 3. The device according to claim 1, wherein
A power converter characterized by being a heavy system . 4. The method of claim 1, wherein the power command unit and power control unit a duplex system, the pulse control unit and the triple system, the 3
Three logical products for inputting two different pulse width modulation control signals from the multi- system pulse controller and the three logical products
Any one of the pulse width modulation control signals
One that selects and outputs width modulated control signal to the power converter
A power conversion device comprising a logical sum . 5. The method of claim 1, comprising a failure diagnosis function unit for detecting an abnormality of the signal by transmitting and receiving a signal to power command unit and the power control unit, the fault diagnosis function unit power command unit and the power a calculation unit for storing a signal from the control unit includes a determining unit for detecting an abnormality and failure from the output of the operational unit, select the appropriate signal from a plurality of signals by the determination unit, the power instruction unit A power conversion device, which instructs a determination unit of a power control unit to select a signal and indicate a path of the signal . 6. The power dividing unit according to claim 1, wherein the dividing unit comprises a microcomputer, a power command unit and a power control unit perform sampling and calculation periodically, and a control information sampling and calculation cycle of the power command unit is The control information sampling of the power control unit and an integral multiple of the operation cycle,
The control information transmission between the power command units and from the power command unit to the power control unit is performed for each sampling of the power command unit, and control between the power control units and control from the power control unit to the pulse control unit is performed. A power converter, wherein information transmission is performed for each sampling of the power control unit. 7. The power converter according to claim 6, wherein the control information transmission between the power control units alternately performs transmission and reception for each sampling.