JPH11196564A - Controller of power converter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a wiring cost when a plurality of switching devices for a power converter are controlled by one control means. SOLUTION: Among a plurality of connecting means which are connected to each other with optical fibers 102, for instance, a connecting means 104 is connected to a control means 101 through a serial signal transmitting means 105, and connecting means 106a and 106b are connected to switching devices 103a and 103b through serial signal receiving means 107a and 107b and gate driving means 108a and 108b respectively, to control a plurality of the switching devices by one control means 101 easily.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a power converter including a plurality of switching elements.

[0002]

2. Description of the Related Art FIG. 15 shows a first conventional example. Control means 101, N gate driving means 108a, 108b, N
The control means 101 and the gate drive means 108a and 108b are connected by drive signal lines 1101a and 1101b. The output of the control means 101 is the gate drive means 1
08a, 108b and the switching element 103
a, 103b. FIG. 16 shows a second conventional example. In contrast to the first conventional example, the failure detection means 202a, 20
15 is the same as FIG. 15 except that 2b and fault signal lines 1201a and 1201b are added. Note that the failure detecting means 202a, 202b is connected to the switching element 103a, 1
03b is detected to notify the control means of the failure.

[0003]

In the first prior art, the number of drive signal lines required is equal to the number of gate drive means. In a device having a large number of switching elements, wiring cost and space occupied by wiring, signal driving power, Problems such as noise are a problem. On the other hand, in the second conventional example, the same number of fault signal lines are required in addition to the first conventional example.
The burden of the wiring is doubled as compared with the first conventional example. Furthermore, when the types of power converters are different, the number of drive signal lines and fault signal lines and the procedure of protection control are different, so that there is a problem that control means must be prepared according to the type of power converter. is there. Therefore, an object of the present invention is to make it possible to easily control a power converter by reducing the number of drive signal lines and fault signal lines.

[0004]

In order to solve such a problem, according to the first aspect of the present invention, one of a plurality of connecting means connected to each other via an optical fiber is connected via a serial signal transmitting means. Control means are connected, and the other connecting means are connected to each switching element via a serial signal receiving means and a gate driving means, respectively, and each switching element can be controlled via a transmission line comprising the optical fiber and the connecting means. I have to. In the invention of claim 1,
The transmission path is a transmission path capable of two-way communication, and the switching element is provided with a failure detection unit that detects the failure and a failure signal transmission unit that transmits the failure signal, and The control means includes a fault signal receiving means for receiving a fault signal from each switching element, and a protection control means for performing a protection operation when a fault occurs, thereby controlling each switching element via a transmission line, Detection and protection based thereon can be enabled (the invention of claim 2).

According to the first aspect of the present invention, the transmission path is a transmission path capable of two-way communication, and a failure detecting means for detecting a failure of the switching element and transmitting the failure signal to the switching element. Fault signal transmitting means, and protection control means for performing a protection operation according to the fault,
Further, a fault signal receiving means for receiving a fault signal from each switching element is added to the control means, thereby enabling control of each switching element via a transmission line, fault detection and protection based on the fault ( The invention of claim 3). In the invention according to claim 2 or 3, the fault detecting means is provided with fault recording means for reading and recording the output of the fault detecting means in accordance with a command from the control means, and controlling each switching element via a transmission line. , Failure detection, protection based on the failure detection, and failure recording can be enabled (the invention of claim 4).

According to a fifth aspect of the present invention, one of a plurality of connecting means connected to each other via an optical fiber is connected to a control means via a serial signal transmitting means, and a serial means is connected to each of the remaining connecting means. A plurality of switching element groups are connected via the gate driving means via the signal receiving means and the pulse distribution means, respectively, and each switching element is controllable via a transmission line comprising the optical fiber and the connecting means. In the invention according to claim 5, the transmission path is a transmission path capable of two-way communication, and the switching element has a failure detection means for detecting the failure, and a failure signal transmission for transmitting the failure signal. Means, and the control means further includes a fault signal receiving means for receiving a fault signal from each switching element, and a protection control means for performing a protection operation when a fault occurs. It is possible to control each switching element and detect a failure and protect based on the failure.
Invention).

In the invention of claim 5, the transmission path is a transmission path capable of two-way communication, and the switching element is provided with a failure detection means for detecting a failure, and a failure signal is supplied to the switching element. A fault signal transmitting means for transmitting and a protection control means for performing a protection operation according to the fault are added, and a fault signal receiving means for receiving a fault signal from each switching element is added to the control means. It is possible to control each switching element via a path, detect a failure, and protect based on the failure (the invention of claim 7). In the invention according to claim 6 or 7, a fault recording means for reading and recording the output of the fault detecting means in accordance with a command from the control means is added to the fault detecting means, so that each switching element can be controlled via a transmission line. ,
Fault detection, protection based on the fault, and fault recording can be enabled (the invention of claim 8).

[0008]

FIG. 1 is a configuration diagram showing a first embodiment of the present invention. As shown, here, the optical fiber 102 and N + 1 connecting means 104, 106a, 1
06b, a transmission path is formed, and the first connection means 104
Includes serial signal transmitting means 105 and control means 101
And the second to (N + 1) th connection means 10
6a to 106b include serial signal receiving means 107a,
107b, gate driving means 108a and 108b, and switching elements 103a and 103b are combined and connected.

In the above configuration, the control means 10
The command output from 1 is transmitted from the serial signal transmitting means 105 to the transmission path through the first connecting means 104. The serial signal receiving unit 107a includes the control unit 101
Is received from the second connection means 106a and sent to the gate drive means 108a. In the gate driving means 108a, the switching element 1
03a is driven. Such an operation is based on other connection means,
The same applies to the serial signal receiving means, the gate driving means, and the switching element.

FIG. 2 shows a specific example of the connection means. FIG. 1A is composed of photocouplers PC1 and PC2, an optical / electrical converter CN1 and an electrical / optical converter CN2, and a signal from an optical fiber is controlled by a photocoupler PC1 and an optical / electrical converter CN1. Alternatively, the signal is input to the serial signal receiving means, and the output from the control means or the serial signal receiving means is output from the electric / optical converter CN2 and the photocoupler PC.
2 to an optical fiber. FIG.
It is composed of an electrical converter CN1, an electrical / optical converter CN2 and a switch SW, and a signal from the optical fiber is input to the control means or the serial signal receiving means via the optical / electrical converter CN1, and receives the control means or the serial signal reception. The output from the means is a switch SW and an electrical / optical converter CN2.
Through the optical fiber.

FIG. 3 is a block diagram showing a second embodiment of the present invention. 1, a fault signal receiving means 203, a protection control means 204, a fault detecting means 202
a, 202b and fault signal transmitting means 201a, 201b. Further, the transmission path 205 using an optical fiber has a bidirectional transmission function. Since the driving method of the switching element in such a configuration is the same as that in the case of FIG. 1, the operation when a failure occurs in the switching element will be described here.

FIG. 4 shows a specific example of the failure detecting means. FIG. 7A shows the current flowing through the switching element and determines that a fault occurs when an overcurrent occurs. FIG. 8B shows that the signal is turned on logically even when a signal for turning on the switching element is given. If it cannot be determined that a failure has occurred, a failure is determined.
When the failure detecting means 202a detects a failure, for example, the failure signal transmitting means 201a and the second connecting means 1
06a through the optical fiber transmission line 2
05. The same applies to the case of a failure of another switching element. The failure signal receiving means 203 receives the failure signal via the second connection means 104 and notifies the control means 101 and the protection control means 204. As a result, the protection control unit 204 immediately transmits a protection instruction via the serial transmission unit 105, and
01 executes a predetermined failure process.

FIG. 5 shows a specific example of the protection operation by the protection control means. This is to perform processing as shown in FIG. 2B on a two-level inverter as shown in FIG. That is, in this example, when a failure is detected by a two-level inverter as shown in FIG. FIG. 6 shows another specific example of the protection operation by the protection control means. This is a process in which a three-level inverter as shown in FIG. 3A is processed as shown in FIG. 3B. When a fault occurs in the inverter as shown in FIG. Instead of blocking
This is an example in which protection is performed by shutting off the gate in consideration of the shutoff order.

FIG. 7 is a block diagram showing a third embodiment of the present invention. 1 is different from that shown in FIG. 1 in that the fault signal receiving means 203, the fault detecting means 202a and 202b, the fault signal transmitting means 201a and 201b, and the protection control means 301 are provided.
The feature is that a and 301b are added. Further, the transmission path 205 using an optical fiber has a bidirectional transmission function. The difference from FIG. 3 is that the protection control means is not provided on the control means side but is provided separately on the switching element side. For example, when the failure detecting means 202a detects a failure of the switching element 103a, it sends a failure signal through the failure signal transmitting means 201a and the second connecting means 106a. Upon receiving the failure signal, the protection control unit 301a causes the gate driving unit 108a to execute a protection operation for protecting the element. When the other serial signal receiving unit 107b receives a failure signal, the protection control unit 30
1b, the switching element 103b
To perform a protection operation for protecting. in this way,
When the switching element fails, the corresponding protection control means cooperate to perform protection.

FIG. 8 is a block diagram showing a fourth embodiment of the present invention. This is characterized in that failure signal recording means 401a and 401b are added to the configuration shown in FIG. Therefore, for example, when the first failure detection means 202a detects a failure of the switching element 103a, the failure signal recording means 401a functions to record a failure signal waveform. When the serial signal receiving unit 107a receives a failure record reading command from the control unit 101, the failure signal recording unit 401a reads the record and transmits the record to the control unit 101 through the failure signal transmission unit 201a. Similarly, the other failure signal recording means records and reads the failure of the corresponding switching element. FIG. 9 shows a modification of FIG. This is obtained by adding failure signal recording means 401a and 401b to the one shown in FIG. 7, and its functions and operations are the same as those in FIG.

FIG. 10 is a configuration diagram showing a fifth embodiment of the present invention. The difference from the one shown in FIG.
Pulse distribution means 602a and 602b are connected to the output terminals of the serial signal receiving means 601a and 601b connected to the (K + 1) th connection means 605a and 605b, respectively.
Gate driving means 603a, 603b, 60
Switching elements 604a, 604 via 3c, 603d
04b, 604c and 604d are connected. The pulse distribution units 602a and 602b transmit commands from the control unit received by the serial signal receiving units 601a and 601b to gate driving units 603a, 603b and 603.
c, 603d. That is, the connection unit and the pulse distribution unit are shared by a plurality (one group) of switching elements. Thereby, the control means 101
By sending a command to the K serial signal receiving means,
It becomes possible to control all the switching elements more than K.

FIG. 11 is a block diagram showing a sixth embodiment of the present invention. 10 is different from that shown in FIG. 10 in that a transmission path 205 using an optical fiber is provided with a bidirectional communication function, and switching elements 604a, 604b, and 604 are provided.
c, 604d, failure detection means 702a, 702b, 702c, 702d for detecting the failure, and failure signal transmission means 701a, 701b, 70 for transmitting the signal.
The feature is that 1c and 701d are added. For example,
When the failure detection means 702a, 702b connected to the switching elements 604a, 604b detects a failure of the switching element, the failure detection signal is sent to the failure signal sending means 7
01a to the control means 101. Thereby, the same control as in FIG. 3 can be performed.

FIG. 12 is a configuration diagram showing a seventh embodiment of the present invention. The difference from the one shown in FIG. 10 is that the transmission line 205 using an optical fiber has a bidirectional communication function and the switching elements 604a, 604b, and 6
04c, 604d, failure detection means 702a, 702b, 702c, 702d for detecting the failure, and failure signal transmission means 701a, 701b for transmitting the signal.
And protection control means 801a and 801b are added, and a fault signal receiving means 203 is added to the control means 101. For example, the switching element 60
Focusing on 4a and 604b, the faults detected by the fault detecting means 702a and 702b connected to each of them are as follows.
The signal is transmitted by the failure signal transmitting means 701a and is also given to the protection control means 801a. The protection control unit 801a controls the pulse distribution unit 602a to protect the switching element group. Further, the other protection control means receives the failure signal from the serial signal receiving means and protects the switching element group connected thereto.
The operation on the control means side is the same as in the case of FIG.

FIG. 13 is a block diagram showing an eighth embodiment of the present invention. The difference from FIG. 11 is that failure signal recording means 901a and 901b are added. The failure signal recording means 901a and 901b
a, 702b, 702c, and 702d are received to record the waveform of the fault signal. That is, the read command from the control means 101 is transmitted to the serial signal receiving means 601a,
01b, failure signal recording means 901a, 90b
1b reads the record, and outputs the failure signal sending means 701a,
01b to the control means 101. FIG. 14 shows a modification of FIG. This is obtained by adding failure signal recording means 401a and 401b to the one shown in FIG. 12, and its functions and operations are the same as those in FIG.

[0020]

According to the present invention, power converters of various configurations can be controlled by a single set of transmission lines using optical fibers, so that the present invention can be easily applied even when the configuration of the power converters and the number of switching elements are different. Can be. Further, even when the configuration is complicated, the burden of wiring can be greatly reduced. further,
According to the first to fourth aspects of the present invention, since the switching elements are insulated by the optical fiber, even a power converter using a high voltage can be controlled easily and with high reliability. According to the inventions of claims 5 to 8, switching elements can be grouped and driven, so that even a power converter having many switching elements can be controlled easily and with high reliability.

In addition, according to the second and sixth aspects of the present invention, since the switching element can be protected in the vicinity thereof, high-speed protection can be achieved. In particular, in the invention of claim 6, since the pulses are distributed to the switching element group at a time, high-speed protection coordination on the switching element side is facilitated. Further, according to the third and seventh aspects of the present invention, since the failure signals of all the switching elements can be obtained, the protection coordination of the entire power converter can be achieved. Further, according to the fourth and eighth aspects of the present invention, since failure recording can be performed in the vicinity of the switching element, the load on the control means hardware can be reduced. In particular, according to the invention of claim 8, a plurality of fault signals can be recorded collectively.

[Brief description of the drawings]

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

FIG. 2 is a block diagram showing a specific example of a connection unit.

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

FIG. 4 is a configuration diagram showing a specific example of a failure detection unit.

FIG. 5 is an explanatory diagram showing a first specific example of protection control means.

FIG. 6 is an explanatory diagram showing a second specific example of the protection control means.

FIG. 7 is a configuration diagram showing a third embodiment of the present invention.

FIG. 8 is a configuration diagram showing a fourth embodiment of the present invention.

FIG. 9 is a configuration diagram showing a modification of FIG. 8;

FIG. 10 is a configuration diagram showing a fifth embodiment of the present invention.

FIG. 11 is a configuration diagram showing a sixth embodiment of the present invention.

FIG. 12 is a configuration diagram showing a seventh embodiment of the present invention.

FIG. 13 is a configuration diagram showing an eighth embodiment of the present invention.

FIG. 14 is a configuration diagram showing a modification of FIG.

FIG. 15 is a configuration diagram showing a first conventional example.

FIG. 16 is a configuration diagram showing a second conventional example.

[Explanation of symbols]

101: control means, 102, 205: optical fiber, 10
3a, 103b, 604a, 604b switching elements, 104, 106a, 106b, 605a, 605b
... connecting means, 105 ... serial transmitting means, 107a, 1
07b, 601a, 601b... Serial receiving means, 10
8a, 108b, 603a, 603b gate drive means, 201a, 201b, 701a, 701b failure signal transmission means, 202a, 202b, 702a, 702b
... failure detecting means, 203 ... failure signal receiving means, 204,
301a, 301b, 801a, 801b ... protection control means, 401a, 401b, 901a, 901b ... failure signal recording means, 103a, 103b ... pulse distribution means.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Kiyoaki Sasakawa 1-1-1, Tanabe Nitta, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Fuji Electric Co., Ltd.

Claims (8)

[Claims] 1. A control means is connected to one of a plurality of connecting means connected to each other via an optical fiber via a serial signal transmitting means, and the other connecting means is connected to a serial signal receiving means and a gate driving means. A control device for a power converter, wherein each switching element is connected via a transmission line, and each switching element is controllable via a transmission line including the optical fiber and a connection unit. 2. The transmission line is a transmission line capable of two-way communication, and the switching element further includes a failure detection unit that detects a failure and a failure signal transmission unit that transmits the failure signal. And the control means further includes a fault signal receiving means for receiving a fault signal from each switching element, and a protection control means for performing a protection operation when a fault occurs. The control device for a power converter according to claim 1, wherein the control of the power converter, the failure detection, and the protection based on the failure are enabled. 3. The transmission path is a transmission path capable of two-way communication, the switching element includes a failure detection unit that detects a failure, a failure signal transmission unit that transmits a failure signal, and a failure signal transmission unit. Protection control means for performing a protection operation according to the above, and a failure signal receiving means for receiving a failure signal from each switching element is added to the control means, and control of each switching element via a transmission path is performed. The control device for a power converter according to claim 1, wherein failure detection and protection based thereon are enabled. 4. A failure recording means for reading and recording the output of the failure detection means in accordance with a command from the control means to the failure detection means, for controlling each switching element via a transmission line, detecting a failure, and based on the control. 4. The control device for a power converter according to claim 2, wherein protection and failure recording are enabled. 5. A control means is connected to one of a plurality of connecting means connected to each other via an optical fiber via a serial signal transmitting means, and a serial signal receiving means and a pulse are connected to each of the remaining connecting means. A plurality of switching element groups are connected via a gate driving means via distribution means, and each switching element is controllable via a transmission line comprising the optical fiber and the connection means. Control device. 6. The transmission line is a transmission line capable of two-way communication, and the switching element is provided with a failure detection unit for detecting a failure and a failure signal transmission unit for transmitting the failure signal. And the control means further includes a fault signal receiving means for receiving a fault signal from each switching element, and a protection control means for performing a protection operation when a fault occurs. 6. The control device for a power converter according to claim 5, wherein the control of the power converter, the failure detection, and the protection based on the failure are enabled. 7. The transmission line is a transmission line capable of two-way communication, the switching element includes a failure detection unit that detects a failure, a failure signal transmission unit that transmits a failure signal, and a failure signal transmission unit. Protection control means for performing a protection operation according to the above, and a failure signal receiving means for receiving a failure signal from each switching element is added to the control means, and control of each switching element via a transmission path is performed. 6. The power converter control device according to claim 5, wherein failure detection and protection based on the failure detection are enabled. 8. A failure recording means for reading and recording the output of the failure detection means in accordance with a command from the control means to the failure detection means, for controlling each switching element via a transmission line, detecting a failure, and based on the control. 8. The control device for a power converter according to claim 6, wherein protection and fault recording are enabled.