JP2020078172A - Power converter and power output system - Google Patents

Abstract

To provide a power converter and a power output system capable of suppressing the supply of power to a load in a state where the phase is not synchronized, even when an abnormality occurs in communication via a communication line.SOLUTION: This first inverter device 1 is provided with a first control unit 13 that controls the transmission and reception of a synchronization signal C via a communication line 5 between a second inverter device 2 and a first inverter device. The first control portion 13 is configured to obtain operation information D2 from the second inverter device 2 via a signal line 7b configured separately from the communication line 5, and to control interruption of the power of the alternating current output from the second inverter device 2 based on the detection of an abnormality in the communication via the communication line 5 and the obtained operation information D2.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a power converter and a power output system.

  BACKGROUND ART Conventionally, a plurality of power conversion devices connected in parallel with each other and a power output system including a plurality of power conversion devices are known (for example, see Patent Document 1).

  Patent Document 1 discloses a power conversion device (power output system) including two power converters connected in parallel between a wind power generator and a power system. The two power converters have the same configuration, one functioning as a master power converter and the other functioning as a slave power converter. Further, the control devices of the two power converters are configured to be communicable with each other by the communication means. Then, the control device of the slave power converter is configured to change the phase of its own carrier so as to synchronize its own carrier with the carrier of the master power converter acquired via the communication means.

JP, 2017-38477, A

  However, in Patent Document 1 described above, the carrier of the master power converter and the carrier of the slave power converter are synchronized by communication via a communication unit (communication line). Therefore, when an abnormality occurs in the communication via the communication line, it is considered that it becomes difficult to synchronize the carrier of the master power converter and the carrier of the slave power converter. Further, the control device of each power converter is considered to continue to output power when it recognizes its own control as normal. Therefore, conventionally, even when an abnormality occurs in the communication via the communication line, it is possible to prevent the AC power in the state where the phases are not synchronized from being supplied to the power system (load). A power converter (power converter) and a power converter (power output system) have been desired.

  The present invention has been made to solve the above problems, and an object of the present invention is to achieve a state where phases are not synchronized even when an abnormality occurs in communication via a communication line. An object of the present invention is to provide a power conversion device and a power output system capable of suppressing the power of the power supply to the load.

  In order to achieve the above object, a power converter according to a first aspect of the present invention is one of a plurality of power converters that are connected in parallel with each other and output power, and A power conversion unit for outputting, a phase of power output from another power conversion device, and a synchronization signal for synchronizing the phase of power output from the power conversion unit with another power conversion device. , A control unit for performing transmission / reception control via a communication line, the control unit acquires operation information from another power conversion device via a signal line configured separately from the communication line, and communicates Control is performed to cut off the power output from another power conversion device based on the detection of the abnormality in the communication via the line and the acquired operation information.

  In the power conversion device according to the first aspect of the present invention, as described above, the control unit acquires the operation information from the other power conversion device via the signal line configured separately from the communication line, It is configured to perform control to cut off the power output from another power conversion device based on the detection of the abnormality of the communication via the communication line and the acquired operation information. Thereby, even when communication via the communication line becomes abnormal, the power output from another power conversion device can be shut off based on the operation information acquired via the signal line. Therefore, even if the other power electronics device determines that its own power electronics device is normal (normal), the power output from the other power electronics device is forcibly cut off, and The electric power from the electric power conversion device can be supplied to the load. As a result, since the electric powers having different phases are not output, even if an abnormality occurs in the communication via the communication line, the electric power in the state where the phases are not synchronized is suppressed from being supplied to the load. be able to.

  In the power conversion device according to the first aspect described above, preferably, the control unit performs control of transmitting / receiving the operation information to / from another power conversion device via a communication line, and transmits a synchronization signal to the other power conversion device. It is configured to perform control not to transmit / receive to / from the device via a signal line. According to this structure, since it is not necessary to provide a structure for transmitting the synchronization signal to the signal line, it is possible to prevent the structure of the power output system including the plurality of power conversion devices from becoming complicated. As a result, it is possible to prevent the power output system from being supplied with electric power in a state where the phases are not synchronized, while suppressing the configuration of the power output system from becoming complicated.

  In the power conversion device according to the first aspect described above, preferably, the control unit controls the slave-side power that operates based on the synchronization signal that the power conversion device of its own has acquired from the master-side power conversion device of the other power conversion devices. If it is a converter, and if an abnormality in the communication via the communication line is detected and the obtained operation information indicates that another power converter is abnormal, the power converter of its own is set as a slave. The power conversion device on the side is changed to the power conversion device on the master side, and control is performed to cut off the power output from another power conversion device. With this configuration, even when an abnormality occurs in the communication via the communication line due to the abnormality in the other power conversion device that is the master-side power conversion device, the master power conversion device is controlled by the master power conversion device. It can be operated as a side power conversion device. As a result, even if an abnormality occurs in another power conversion device that is the master power conversion device, the power conversion device of its own should take the place of the master power conversion device and continue supplying power to the load. You can

  In this case, preferably, the control unit detects an abnormality in the communication via the communication line when the power conversion device of its own is the master power conversion device that transmits the synchronization signal to the slave power conversion device. In addition, when the acquired operation information indicates that the slave side power conversion device is normal, control is performed to cut off the power output from the slave side power conversion device. With this configuration, even if the slave side power conversion device determines that its own power conversion device is normal and tries to continue output of power, the power output from the slave side power conversion device is forced. The power output from the master-side power conversion device includes the power output from the slave-side power conversion device in a state where the phase is not synchronized due to an abnormality in the communication via the communication line. Output can be suppressed.

  In the power conversion device configured so that the power conversion device of its own can be changed from the power conversion device of the slave side to the power conversion device of the master side, preferably, the control unit controls the power conversion device of the slave side to be the power conversion device of the slave side. If the device is a device, if an abnormality in communication via a communication line is detected, and if the acquired operation information indicates that the master power conversion device is normal, then it is output from its own power conversion device. The power is cut off. With this configuration, even when both the slave-side power conversion device and the master-side power conversion device are operating normally, the power output from the power conversion device of its own, which is the slave-side power conversion device, Can be shut off. As a result, even if both the slave side power conversion device and the master side power conversion device try to continue output of power in the state of communication abnormality, the output of power from the slave side power conversion device can be cut off. Therefore, it is possible to suppress the output of the power from the slave side power conversion device in the state where the phase is not synchronized due to the communication abnormality in the power output from the master side power conversion device. You can

  In the power conversion device according to the first aspect described above, preferably, the operation information includes control power supply information indicating whether or not power is being supplied to the control unit of the other power conversion device, and controls the power conversion device of its own. The unit detects an abnormality in communication through the communication line, and when the control power supply information indicating that power is not being supplied to the control unit of the other power electronics device is acquired, the other power electronics device outputs. Controls to cut off the output power. With this configuration, when the other power conversion device becomes abnormal and it is appropriate to cut off the power output from the other power conversion device, the power output from the other power conversion device is cut off. You can

  In this case, preferably, the operation information is control power supply information, operation command information indicating presence / absence of an operation command by a control unit of another power conversion device, and output voltage information indicating presence / absence of an output voltage of another power conversion device. In addition, the control unit of the power conversion device of its own detects the abnormality of the communication via the communication line, and outputs the control power source information indicating that the power is supplied to the control units of the other power conversion devices. When acquired, control is performed to cut off the power output from another power conversion device based on the operation command information and the output voltage information. According to this structure, it is possible to determine whether the other power conversion device is normal or abnormal based on the operation command information and the output voltage information as well as the control power supply information. As the number of types of information to be performed increases, it is possible to more accurately determine whether the other power conversion device is normal or abnormal.

  In a power conversion device that performs control for cutting off power output from another power conversion device based on the operation command information and the output voltage information, preferably, the control unit of its own power conversion device is via a communication line. Output voltage that indicates that there is no output voltage, or that the operation command information indicating that there is no operation command is detected, or that the communication error via the communication line is detected When the information is acquired, control is performed to cut off the power output from another power conversion device. According to this structure, the power output from the other power conversion device when there is a possibility that the other power conversion device is abnormal based on the control power supply information, the operation command information, and the output voltage information. It is possible to perform control for shutting off. As a result, when the other power conversion device is abnormal, it is possible to more reliably suppress the supply of the power from the other power conversion device to the load.

  In the power conversion device according to the first aspect, preferably, the control unit is configured to serially communicate with another power conversion device via the signal line. With this configuration, unlike parallel communication in which one type of signal is transmitted per signal line, a plurality of types of signals can be transmitted per one signal line. It is possible to suppress complication.

  In the power conversion device according to the first aspect, preferably, the control unit outputs from the plurality of power conversion devices based on detection of an abnormality in communication via the communication line and the acquired operation information. By controlling the opening and closing of the relay provided in the current collector that collects the AC power, the AC power output from the other power converter is controlled. According to this structure, even when the output of the AC power is continued from the other power conversion device, the open / close of the relay provided on the output side of the other power conversion device is controlled to forcefully. It is possible to cut off the AC power from the other power conversion device toward the load.

  In the power conversion device according to the first aspect described above, preferably, when the control unit fails to receive the communication signal from another power conversion device a plurality of times via the communication line, an abnormality in the communication via the communication line. Is detected. According to this structure, the communication line is more accurately transmitted than the case where the abnormality of the communication via the communication line is detected (the abnormality is judged) based on the detection of the reception failure only once. Communication abnormalities can be detected.

  In the power output system according to the second aspect of the present invention, the output sides are connected in parallel with each other, the plurality of power conversion devices that output electric power are connected to the plurality of power conversion devices, and the plurality of power conversion devices output the power. A communication line that transmits a synchronization signal for synchronizing the phases of the electric power that is generated, and the communication line are configured separately, connect a plurality of power conversion devices, and transmit the operation information of each of the plurality of power conversion devices. And a signal line to, each of the plurality of power conversion devices, while acquiring operation information from another power conversion device different from its own power conversion device, and that the abnormality of the communication via the communication line is detected, The control unit includes a control unit that cuts off power output from another power conversion device based on the acquired operation information.

  With the power output system according to the second aspect of the present invention, by configuring as described above, the phase can be changed even when an abnormality occurs in the communication via the communication line, as in the power conversion device according to the first aspect. It is possible to provide a power output system capable of suppressing the supply of power to the load in a state where the power is not synchronized.

  According to the present invention, as described above, even when an abnormality occurs in communication via a communication line, it is possible to prevent power from being supplied to a load in a state where phases are not synchronized.

FIG. 3 is a block diagram showing an arrangement configuration of a power converter, an AC power supply, and a load according to an embodiment. It is a figure for demonstrating the driving information by one Embodiment, (a) It is a figure for demonstrating about the kind of signal of driving information, and (b) transmission of driving information. It is a figure for explaining control based on driving information of the 1st control part and the 2nd control part by one embodiment.

  An embodiment of the present invention will be described below with reference to the drawings.

[This embodiment]
The configuration of the power output system 100 according to the present embodiment will be described with reference to FIGS. 1 to 3.

(Overall structure of power output system)
As shown in FIG. 1, the power output system 100 converts the power from the power supply units (the first power supply unit 101 and the second power supply unit 102) of a plurality of systems into the power and converts the power (AC power). ) Is output to the load 103. The first power supply unit 101 and the second power supply unit 102 are configured separately from each other. The first power supply unit 101 and the second power supply unit 102 are each configured as a DC power supply device or an AC power supply device. For example, the first power source unit 101 and the second power source unit 102 are configured as a battery or a commercial power source.

  Then, the power output system 100 includes the first inverter device 1 and the second inverter device 2 whose output sides are connected in parallel with each other and which output AC power. That is, the power output system 100 is configured as a system that drives a plurality of power conversion devices in parallel. The input side of the first inverter device 1 is connected to the first power supply unit 101, and the input side of the second inverter device 2 is connected to the second power supply unit 102. The first inverter device 1 and the second inverter device 2 are examples of the "power conversion device" in the claims.

  The power output system 100 also includes the current collector 3. The input side of the current collector 3 is connected to the output terminal 11 of the first inverter device 1 via the lead wire 4a, and is connected to the output terminal 21 of the second inverter device 2 via the lead wire 4b. The output side of the current collector 3 is connected to the load 103.

  The first inverter device 1 includes a first power converter 12 and a first controller 13. The first power conversion unit 12 includes a plurality of switching elements and the like, and is configured to convert the power from the first power supply unit 101 into AC power. The first controller 13 outputs the synchronization signal C for synchronizing the phase of the AC power output from the second inverter device 2 and the phase of the AC power output from the first inverter device 1 to the second It is configured to perform transmission / reception control with the inverter device 2 via a communication line 5 described later. Then, the first control unit 13 is configured to generate a command signal for performing pulse width modulation based on the synchronization signal C, and by transmitting this command signal to the first power conversion unit 12. , The first power converter 12 is configured to be driven. The first power converter 12 is an example of the "power converter" in the claims. The first control unit 13 is an example of the "control unit" in the claims.

  The second inverter device 2 includes a second power conversion unit 22 and a second control unit 23. The second power conversion unit 22 is configured similarly to the first power conversion unit 12. The second controller 23 has the same configuration as the first controller 13. That is, the second inverter device 2 is configured similarly to the first inverter device 1. The second power converter 22 is an example of the "power converter" in the claims. The second control unit 23 is an example of the “control unit” in the claims.

  The current collector 3 is configured to collect the power output from each of the first inverter device 1 and the second inverter device 2 and supply the collected power to the load 103. Further, the current collector 3 may shut off the power output from each of the first inverter device 1 and the second inverter device 2 based on the command signal from the first inverter device 1 or the second inverter device 2. It is configured to be possible.

  Specifically, the current collector 3 includes relays 31, 32, 33, and 34. The relays 31 and 32 are arranged in series between the first inverter device 1 and the load 103. Further, the relays 33 and 34 are arranged in series between the second inverter device 2 and the load 103. Each of the relays 31 to 34 is provided with a switch that switches between a state in which both ends thereof are electrically conducted and a state in which they are cut off. In addition, although the relays 31 and 32 are described as separate switches in FIG. 1, the relays 31 and 32 are configured as a single switch (relay), and the current collector 3 is configured so that the command signal from the first inverter device 1 and the The operation of this switch may be controlled based on a command signal from the two-inverter device 2.

  The relay 31 is configured to switch between a state in which the first inverter device 1 and the load 103 are electrically disconnected and a state in which they are electrically conductive, based on a command signal from the first inverter device 1. Further, the relay 32 is configured to switch between a state in which the first inverter device 1 and the load 103 are electrically disconnected and a state in which they are electrically conductive, based on a command signal from the second inverter device 2. The relay 33 is configured to switch between a state in which the second inverter device 2 and the load 103 are electrically disconnected and a state in which they are electrically conductive, based on a command signal from the first inverter device 1. Further, the relay 34 is configured to switch between a state in which the second inverter device 2 and the load 103 are electrically disconnected and a state in which they are electrically conductive, based on a command signal from the second inverter device 2.

  As a result, when all the relays 31 to 34 are turned on (a state in which both ends are made conductive), the power output from the first inverter device 1 and the power output from the second inverter device 2 are combined. In this state, the combined power is supplied to the load 103. When one of the relays 31 or 32 is off (a state in which both ends are cut off) and the relays 33 and 34 are on, the power output from the second inverter device 2 is the load 103. Is supplied to. When the relays 31 and 32 are turned on and one of the relays 33 or 34 is turned off, the electric power output from the first inverter device 1 is supplied to the load 103. When either one of the relays 31 or 32 is off and one of the relays 33 or 34 is off, no electric power is supplied to the load 103.

  Here, in the present embodiment, the power output system 100 connects the first inverter device 1 and the second inverter device 2, and at the same time, the phase of the AC power output from the first inverter device 1 and the second inverter device 2. A communication line 5 for transmitting a synchronization signal C (for example, a carrier signal) for synchronizing the two is included.

  The communication line 5 connects the communication terminal 14 of the first inverter device 1 and the communication terminal 24 of the second inverter device 2. The first inverter device 1 and the second inverter device 2 perform communication in accordance with a predetermined communication standard (for example, EIA: Electronic Industries Association, more specifically, RS-485) via the communication line 5. Is configured. Then, the first inverter device 1 and the second inverter device 2 communicate with each other through the communication line 5 (high-speed communication) to perform various parallel adjustment control including phase control of AC power output from each. Is configured to do.

  The power output system 100 also includes a signal line 6a connecting the current collector 3 and the first inverter device 1 and a signal line 6b connecting the current collector 3 and the second inverter device 2. The first inverter device 1 is configured to transmit various drive signals including a command signal for operating the relays 31 and 33 via the communication terminal 15 and the signal line 6a. The second inverter device 2 is also configured to transmit various drive signals including a command signal for operating the relays 32 and 34 via the communication terminal 25 and the signal line 6b. In addition, the current collector 3 transmits a feedback signal acquired from a sensor unit or the like (not shown) to the first inverter device 1 via the signal line 6a, and a sensor unit or the like not shown via the signal line 6b. It is configured to transmit the feedback signal acquired from the second inverter device 2.

<Structure of signal line for transmitting driving information>
Here, in the present embodiment, the power output system 100 is configured separately from the communication line 5, connects the first inverter device 1 and the second inverter device 2, and operates information D1 of the first inverter device 1. Is provided to the second inverter device 2, and a signal line 7b that transmits the operation information D2 of the second inverter device 2 to the first inverter device 1 is provided. The signal lines 7a and 7b are configured to be able to transmit and receive the operation information D1 and D2 even when the communication line 5 is broken.

  The signal lines 7a and 7b are provided in a wiring path separate from the communication line 5. That is, the signal line 7a and the communication line 5 are not arranged adjacent to each other, and the signal line 7b and the communication line 5 are not arranged adjacent to each other. For example, the communication line 5 is wired without passing through the current collector 3, while the signal lines 7a and 7b are wired through the current collector 3. This prevents the signal lines 7a and 7b and the communication line 5 from being disconnected all at once. The signal line 7a is connected to the communication terminal 16 provided separately from the communication terminal 14 of the first inverter device 1. The signal line 7b is connected to a communication terminal 26 provided separately from the communication terminal 24 of the second inverter device 2.

  The power output system 100 is configured such that when one of the first inverter device 1 and the second inverter device 2 functions as a master side inverter device, the other functions as a slave side inverter device. That is, both the first inverter device 1 and the second inverter device 2 can function as a master-side inverter device and also can function as a slave-side inverter device. In other words, the power output system 100 is composed of a multi-master type inverter device group. The master-side inverter device is an example of the "master-side power conversion device" in the claims. The slave-side inverter device is an example of the "slave-side power conversion device" in the claims.

  The state of "functioning as a master side inverter device" is a state in which the synchronization signal C is being transmitted to at least another inverter device. Further, in the present embodiment, “functioning as the master side inverter device” includes controlling the operation of the current collector 3 in addition to transmitting the synchronization signal C. Further, “functioning as a slave-side inverter device” means operating based on the synchronization signal C acquired from the master-side inverter device. For example, the slave-side inverter device adjusts the phase of the power output according to the acquired synchronization signal C, so that the phase of the power output from the master-side inverter device and the power output from the slave-side inverter device are adjusted. It is configured to match the phase.

<Structures of first control unit and second control unit>
The first control unit 13 is configured to perform control to determine whether the first inverter device 1 which is its own inverter device functions as a master-side inverter device or a slave-side inverter device. .. Specifically, when the synchronization signal C is not transmitted from the second inverter device 2 via the communication line 5, the first control unit 13 determines that the first inverter device 1 functions as the master-side inverter device. If the synchronization signal C is transmitted from the second inverter device 2, it is determined that the first inverter device 1 functions as a slave side inverter device. In this case, for example, of the first inverter device 1 and the second inverter device 2, the first activated inverter device functions as a master side inverter device, and the later activated inverter device functions as a slave side inverter device. To do.

  The first control unit 13 acquires the operation information D2 from the second inverter device 2 via the signal line 7b configured separately from the communication line 5, and detects an abnormality in the communication via the communication line 5. And the operation information D2 thus acquired, the control is performed to cut off the AC power output from the second inverter device 2. In addition, the second control unit 23, similar to the first control unit 13, acquires the operation information D1 from the first inverter device 1, detects an abnormality in communication via the communication line 5, and the acquired operation. Based on the information D1, it is configured to perform control to cut off the AC power output from the first inverter device 1. Since the first control unit 13 and the second control unit 23 have the same configuration, only the first control unit 13 will be described below, and the description of the second control unit 23 will be omitted.

  In the present embodiment, when the first control unit 13 fails to receive the communication signal (for example, the synchronization signal C or the signal of the driving information D2) from the second inverter device 2 via the communication line 5 multiple times, It is configured to perform control such that an abnormality in communication via the communication line 5 is detected. Specifically, the first control unit 13 detects an abnormality in communication via the communication line 5 when the communication signal reception fails for the number of times of communication during a period in which the power phase shift is not a problem. The control is performed. For example, the first control unit 13 performs control such that when the reception of the communication signal fails three times, an abnormality in the communication via the communication line 5 is detected.

  Then, in the present embodiment, the first control unit 13 controls to transmit / receive the operation information D1 and D2 to / from the second inverter device 2 via the communication line 5, and at the same time, outputs the synchronization signal C to the second inverter device. It is configured to control not to transmit / receive to / from the device 2 via the signal lines 7a and 7b. That is, the communication line 5 is configured to transmit the driving information D1 and D2 and the synchronization signal C, while the signal line 7a is configured to transmit only the driving information D1 and the signal line 7a. 7b is configured to transmit only the driving information D2.

  As shown in FIG. 2A, the operation information D1 and D2 are respectively control power supply information Vcc (which indicates whether or not power is supplied to the control unit (the first control unit 13 or the second control unit 23). 2 and FIG. 3, “S1”) and driving command information So (“S2” in FIGS. 2 and 3) indicating the presence or absence of a driving command by the control unit (the first control unit 13 or the second control unit 23). And the output voltage information Vo (described as “S3” in FIGS. 2 and 3) indicating the presence or absence of the output voltage of the AC power from the inverter device (the first inverter device 1 or the second inverter device 2). including.

  The operation information D1 is configured as bit information, for example, as shown in FIG. 2A, and bits are assigned to each of the control power supply information Vcc, the operation command information So, and the output voltage information Vo. .. For example, the signal state of the control power supply information Vcc is “1” indicating that power is being supplied to the first controller 13, and “0” indicating that power is not being supplied to the first controller 13. Have. In addition, the signal state of the operation command information So is “1” indicating that the first control unit 13 is issuing the operation command to the first power conversion unit 12, and the first control unit 13 performs the first power conversion. It has “0” indicating that no operation command is issued to the unit 12. Further, the signal state of the output voltage information Vo indicates that an output voltage of AC power from the first power conversion unit 12 is generated (a state in which the first power conversion unit 12 is actually driven). 1 ”and“ 0 ”indicating that the output of the voltage from the first power conversion unit 12 is stopped (the state in which the first power conversion unit 12 is stopped) is included. Since the driving information D2 is the same as the driving information D1, the description is omitted.

  The first controller 13 is configured to serially communicate with the second inverter device 2 via the signal lines 7a and 7b. Specifically, as shown in FIG. 2B, the first control unit 13 repeats the control power source information Vcc, the operation command information So, and the output voltage information Vo in this order (FIG. 2B). Then, from the "old" side to the "new" side), it is configured to transmit to the second control unit 23 via the signal line 7a. In addition, the second control unit 23 receives the control power supply information Vcc, the operation command information So, and the output voltage information Vo via the signal line 7a, and according to the received timing, the control power supply information Vcc, the operation command. It is configured to determine which of the information So and the output voltage information Vo is received. In addition, the second control unit 23 repeats the control power supply information Vcc, the operation command information So, and the output voltage information Vo in this order in the same manner as the first control unit 13, and the first through the signal line 7b. It is configured to transmit to the control unit 13. Further, the first control unit 13 receives the control power supply information Vcc, the operation command information So, and the output voltage information Vo via the signal line 7b, and according to the received timing, the control power supply information Vcc, the operation command. It is configured to determine which of the information So and the output voltage information Vo is received.

  As shown in FIG. 3, when the first control unit 13 detects an abnormality in the communication via the communication line 5, the first control unit 13 determines whether to detect the abnormality based on the control power source information Vcc, the operation command information So, and the output voltage information Vo. It is configured to determine whether to cut off the AC power output from the two-inverter device 2. In addition, when the 1st control part 13 is judging, "self" in FIG. 3 means the 1st inverter apparatus 1, and "counterpart" means the 2nd inverter apparatus 2. In FIG. That is, in this case, the "own relay" means the relay 31 and the "counterpart relay" means the relay 33. Further, when the second control unit 23 makes the determination, “self” in FIG. 3 means the second inverter device 2, and “partner” means the first inverter device 1. That is, in this case, the "own relay" means the relay 34, and the "counterpart relay" means the relay 32. Further, the first control unit 13 controls to open the relay 33 provided in the current collector 3 based on the detection of the abnormality of the communication via the communication line 5 and the acquired operation information D2. By doing so, the AC power output from the second inverter device 2 is cut off. That is, when the first control unit 13 detects an abnormality in communication via the communication line 5, the first control unit 13 transmits a command signal for controlling opening / closing of the relay 33 to the current collector 3 based on the operation information D2.

  The first control unit 13 detects an abnormality in the communication via the communication line 5, and the control power supply information Vcc indicating “0” that the second control unit 23 of the second inverter device 2 is not supplied with power. Is acquired, the control is performed to shut off the AC power output from the second inverter device 2. That is, when the first control unit 13 detects an abnormality in communication via the communication line 5, the operation information D2 indicates at least "No. 1", "No. 2", "No. 3", "No. 4 ”,“ No. 9 ”,“ No. 10 ”,“ No. 11 ”, and“ No. 12 ”, the relay 33 is turned off.

  Further, when the first control unit 13 detects an abnormality in communication via the communication line 5 and acquires the control power supply information Vcc indicating “1” that power is being supplied to the second control unit 23. In addition, the control for shutting off the AC power output from the second inverter device 2 is performed based on the operation command information So and the output voltage information Vo. Specifically, the first control unit 13 detects the abnormality of the communication via the communication line 5 and acquires the drive command information So indicating that there is no drive command, “0”, or the communication line 5 When the abnormality of the communication via the power supply is detected and the output voltage information Vo indicating “0” indicating that there is no output voltage is acquired, the control for shutting off the AC power output from the second inverter device 2 is performed. Is configured. That is, when the first control unit 13 detects an abnormality in the communication via the communication line 5, the operation information D2 indicates “No. 5”, “No. 6”, “No. 7”, “No. 13”. , "No.14", and "No.15", the relay 33 is turned off. In addition, when the abnormality of the communication via the communication line 5 is detected and any one of the control power source information Vcc, the operation command information So, and the output voltage information Vo of the operation information D2 is “0”. Indicates that the second inverter device 2 is abnormal.

  When the first inverter device 1 is a slave-side inverter device (functions as a slave-side inverter device), the first control unit 13 detects and acquires an abnormality in communication via the communication line 5. When the running information D2 indicates that the second inverter device 2 is abnormal, the first inverter device 1 is changed from the slave-side power converter device to the master-side power converter device and is output from the second inverter device 2. It is configured to perform control to cut off the alternating current power. That is, when the first control unit 13 detects an abnormality in the communication via the communication line 5, the operation information D2 is “No. 1” to “No. 15”, the first inverter device 1 is set to the master side. The control to function as the power conversion device is performed, and the control to turn off the relay 33 is performed. In other words, “changing the first inverter device 1 from the slave-side power converter device to the master-side power converter device” means that the first inverter device 1 takes the master authority from the second inverter device 2.

  Moreover, the 1st control part 13 detects the abnormality of the communication through the communication line 5, when the 1st inverter apparatus 1 is a master side power converter device, and the acquired driving information D2 is 2nd. When it indicates that the inverter device 2 is normal, control is performed to cut off the AC power output from the second inverter device 2. That is, when the first control unit 13 detects an abnormality in communication via the communication line 5, even if the control power supply information Vcc is “1” and the operation command information So is “1”, and the output is output. Even when the voltage information Vo is “1” and the second inverter device 2 is normal, control is performed to cut off the AC power output from the second inverter device 2. Specifically, when detecting an abnormality in communication via the communication line 5, the first control unit 13 controls to turn off the relay 33 even when the operation information D2 is “No. 8”.

  Further, the first control unit 13 detects an abnormality in communication via the communication line 5 when the first inverter device 1 is the slave side power conversion device, and the acquired operation information D2 is the master side. When it is indicated that the power conversion device is normal, control is performed to cut off the AC power output from the first inverter device 1. That is, when the first control unit 13 detects an abnormality in communication via the communication line 5, the control power supply information Vcc is “1”, the operation command information So is “1”, and the output voltage information is When Vo is "1" (in the case of "No. 16"), the relay 31 is turned off without interrupting the power output from the second inverter device 2 (the relay 33 remains in the on state). It is configured.

<First operation example>
Next, with reference to FIG. 3, a first operation example of the power output system 100 according to the present embodiment will be described. In the first operation example, the first inverter device 1 functions as a master-side inverter device, and the second inverter device 2 functions as a slave-side inverter device. Then, while both the first inverter device 1 and the second inverter device 2 are normal, the communication line 5 is in a disconnected state.

  In this case, the first control unit 13 performs the “No. 8” control process, and the second control unit 23 performs the “No. 16” control process. Then, the first control unit 13 turns off the relay 33. The second control unit 23 controls the relay 34 to be turned off, the driving of the second power conversion unit 22 to be stopped, and the power output from the second power conversion unit 22 to be stopped. Thus, in the power output system 100, the AC power output from the first inverter device 1 is continuously supplied to the load 103 even when the communication line 5 is broken. In addition, it is possible to prevent the AC power output from the second inverter device 2, which may be out of phase with the AC power output from the first inverter device 1, from being output to the load 103. ..

<Second operation example>
Next, with reference to FIG. 3, a second operation example of the power output system 100 according to the present embodiment will be described. In the second operation example, the first inverter device 1 functions as a master-side inverter device, and the second inverter device 2 functions as a slave-side inverter device. Here, when the control power is not supplied to the first control unit 13 of the first inverter device 1 and the operation of the first control unit 13 is stopped, the second control unit 23 controls the “No. 9” control process. I do. In this case, the second control unit 23 changes the second inverter device 2 from a state in which it functions as a slave side inverter device to a state in which it functions as a master side inverter device (obtains master authority), and turns off the relay 32. To Thereby, in the power output system 100, when the first inverter device 1 becomes abnormal, the AC power output from the first inverter device 1 is shut off, while the AC power output from the second inverter device 2 is output. AC power is continuously supplied to the load 103. Further, before the first inverter device 1 becomes abnormal, the second inverter device 2 that has been functioning as the slave side inverter device can be made to function as the master side inverter device. That is, even when the first inverter device 1 that functions as the master-side inverter device becomes abnormal, it is possible to continuously supply stable power to the load 103.

[Effects of this embodiment]
In this embodiment, the following effects can be obtained.

  In the present embodiment, as described above, the first control unit 13 (second control unit 23) is connected to the second inverter device 2 (through the signal line 7b (7a) configured separately from the communication line 5. The second inverter device is obtained based on the fact that the operation information D2 (D1) is acquired from the first inverter device 1) and the abnormality of the communication via the communication line 5 is detected, and the acquired operation information D2 (D1). 2 (first inverter device 1) is configured to perform control to cut off the power output. As a result, even when the communication via the communication line 5 becomes abnormal, the second inverter device 2 (the first inverter device 1) based on the operation information D2 (D1) acquired via the signal line 7b (7a). ), The electric power output from can be shut off. Therefore, even when the second inverter device 2 (first inverter device 1) determines that the first inverter device 1 (second inverter device 2) has no abnormality (normal), the second inverter device 2 is forcibly forced to operate. It is possible to cut off the power output from the inverter device 2 (first inverter device 1) and supply the power from the first inverter device 1 (second inverter device 2) to the load 103. As a result, even when an abnormality occurs in the communication via the communication line 5, it is possible to prevent the electric powers having different phases from being supplied to the load 103.

  In the present embodiment, as described above, the first control unit 13 (second control unit 23) transmits the operation information D2 (D1) to the second inverter device 2 (first inverter device 1) via the communication line. 5 is configured to perform transmission / reception via 5 and control not to transmit / receive the synchronization signal C to / from the second inverter device 2 (first inverter device 1) via the signal line 7b (7a). To do. Thereby, it is not necessary to provide a configuration for transmitting the synchronization signal C to the signal line 7b (7a), and thus it is possible to prevent the configuration of the power output system 100 including a plurality of inverter devices from becoming complicated. As a result, it is possible to prevent the power output system 100 from being complicated in structure and to prevent the power in the state where the phases are not synchronized from being supplied to the load 103.

  In the present embodiment, as described above, the first control unit 13 (second control unit 23) is replaced by the first inverter device 1 (second inverter device 2) of the second inverter device 2 (first inverter device 1). In the case of the slave side inverter device that operates based on the synchronization signal C acquired from the master side inverter device, an abnormality in communication via the communication line 5 is detected, and the acquired operation information D2 (D1 ) Indicates that the second inverter device 2 (first inverter device 1) is abnormal, the first inverter device 1 (second inverter device 2) is changed from the slave side inverter device to the master side inverter device. , The second inverter device 2 (first inverter device 1) is configured to be cut off. As a result, even if an abnormality occurs in the communication via the communication line 5 due to the abnormality in the second inverter device 2 (first inverter device 1) that is the master side inverter device, the first inverter device 1 (second inverter device 2) can be operated as a master-side inverter device. As a result, even when an abnormality occurs in the second inverter device 2 (first inverter device 1) that is the master-side inverter device, the first inverter device 1 (second inverter device 2) replaces the master-side inverter device. The power supply to the load 103 can be continued.

  In the present embodiment, as described above, the first control unit 13 (second control unit 23) is controlled by the first inverter device 1 (second inverter device 2) on the master side for transmitting the synchronization signal C to the slave inverter device. In the case of the inverter device, when the abnormality of the communication via the communication line 5 is detected and the acquired operation information D2 (D1) indicates that the slave inverter device is normal, the slave inverter It is configured to perform control to cut off the power output from the device. As a result, even when the slave-side inverter device determines that the second inverter device 2 (first inverter device 1) of the slave-side inverter device is normal and tries to continue outputting power, the slave-side inverter device outputs the power. Since the power can be forcibly cut off, the power output from the master-side inverter device is output from the slave-side inverter device in a state where the phase is not synchronized due to an abnormality in communication via the communication line 5. Power can be suppressed from being supplied to the load 103.

  In the present embodiment, as described above, the first control unit 13 (second control unit 23) is used when the first inverter device 1 (second inverter device 2) is the slave-side inverter device and the communication line. Output from the first inverter device 1 (second inverter device 2) when detecting an abnormality in communication via 5 and when the acquired operation information D2 (D1) indicates that the master side inverter device is normal It is configured to perform control to cut off the electric power supplied. Accordingly, even if both the slave-side inverter device and the master-side inverter device are operating normally, the output of electric power from the first inverter device 1 (second inverter device 2), which is the slave-side inverter device, is output. Can be shut off. As a result, even if the slave-side inverter device and the master-side inverter device both try to continue outputting power in a state where there is a communication error, the power output from the slave-side inverter device can be cut off. It is possible to prevent the power output from the master-side inverter device from being supplied to the load 103 from the slave-side inverter device in the state where the phase is not synchronized due to the communication abnormality. ..

  In the present embodiment, as described above, is the operation information D2 (D1) supplied with power to the first control unit 13 (second control unit 23) of the second inverter device 2 (first inverter device 1)? Control power supply information Vcc indicating whether or not is provided. Then, the first control unit 13 (second control unit 23) of the first inverter device 1 (second inverter device 2) detects an abnormality in communication via the communication line 5, and the second inverter device 2 ( When the control power supply information Vcc indicating that power is not supplied to the first control unit 13 (second control unit 23) of the first inverter device 1) is acquired, the second inverter device 2 (first inverter device 1) is acquired. ) Is configured to perform control to cut off the electric power output from. As a result, when the second inverter device 2 (first inverter device 1) becomes abnormal and it is appropriate to cut off the power output from the second inverter device 2 (first inverter device 1), the second inverter device 2 The power output from the second inverter device 1 can be shut off.

  In the present embodiment, as described above, the operation information D2 (D1) includes the control power supply information Vcc and the first control unit 13 (second control unit 23) of the second inverter device 2 (first inverter device 1). The operation command information So indicating the presence / absence of the operation command and the output voltage information Vo indicating the presence / absence of the output voltage of the second inverter device 2 (first inverter device 1) are provided. Then, the first control unit 13 (second control unit 23) of the first inverter device 1 (second inverter device 2) detects an abnormality in communication via the communication line 5, and the second inverter device 2 ( When the control power supply information Vcc indicating that power is being supplied to the first control unit 13 (second control unit 23) of the first inverter device 1) is acquired, the operation command information So and the output voltage information Vo are included. Based on this, the control is performed so that the electric power output from the second inverter device 2 (first inverter device 1) is shut off. As a result, it is determined whether the second inverter device 2 (first inverter device 1) is normal or abnormal based on the operation command information So and the output voltage information Vo as well as the control power supply information Vcc. Therefore, it is possible to more accurately determine whether the second inverter device 2 (first inverter device 1) is normal or abnormal because the number of types of information for determination increases.

  In the present embodiment, as described above, the first control unit 13 (second control unit 23) of the first inverter device 1 (second inverter device 2) detects the abnormality of communication via the communication line 5, In addition, when the operation command information So indicating that there is no operation command is acquired, or when the abnormality of the communication via the communication line 5 is detected and the output voltage information Vo indicating that there is no output voltage is acquired. In addition, the control is performed so that the power output from the second inverter device 2 (first inverter device 1) is shut off. As a result, when the second inverter device 2 (first inverter device 1) may be abnormal based on the control power supply information Vcc, the operation command information So, and the output voltage information Vo, the second inverter device 2 (first inverter device 1) can be controlled to cut off the electric power output from the device. As a result, when the second inverter device 2 (first inverter device 1) is abnormal, the power from the second inverter device 2 (first inverter device 1) is more reliably supplied to the load 103. Can be suppressed.

  In the present embodiment, as described above, the first controller 13 (second controller 23) serially communicates with the second inverter device 2 (first inverter device 1) via the signal line 7b (7a). To configure. As a result, unlike parallel communication in which one type of signal is transmitted per signal line 7b (7a), a plurality of types of signals can be transmitted per one signal line 7b (7a). It is possible to prevent the configuration of the line 7b (7a) from becoming complicated.

  In the present embodiment, as described above, the first control unit 13 (second control unit 23) detects the abnormality of the communication via the communication line 5 and the acquired driving information D2 (D1). The second inverter device 2 (first inverter device 1) by controlling the opening and closing of the relays 31 to 34 provided in the current collector 3 that collects the AC power output from the plurality of inverter devices. It is configured to perform control to cut off the output AC power. Thereby, even when the output of the alternating-current power is continued from the second inverter device 2 (first inverter device 1), the relay 31 provided on the output side of the second inverter device 2 (first inverter device 1). By controlling the opening and closing of ~ 34, it is possible to forcibly shut off the AC power from the second inverter device 2 (first inverter device 1) to the load 103.

  In the present embodiment, as described above, the first control unit 13 (second control unit 23) is moved a plurality of times (three times) from the second inverter device 2 (first inverter device 1) via the communication line 5. When the reception of the communication signal fails, the control is performed such that the abnormality of the communication via the communication line 5 is detected. As a result, the communication via the communication line 5 can be performed more accurately than in the case where the abnormality in the communication via the communication line 5 is detected (the abnormality is determined) based on the detection of the reception failure only once. Anomalies can be detected.

[Modification]
It should be considered that the embodiments disclosed this time are exemplifications in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of the claims, and further includes meanings equivalent to the scope of the claims and all modifications (modifications) within the scope.

  For example, in the above embodiment, an example in which the power conversion device of the present invention is applied to an inverter device has been shown, but the present invention is not limited to this. That is, the power conversion device of the present invention may be applied to a power conversion device other than the inverter device, for example, a converter device.

  Further, in the above embodiment, an example in which the number of inverter devices connected in parallel with each other is two has been shown, but the present invention is not limited to this. That is, the number of inverter devices connected in parallel with each other may be three or more.

  Further, in the above embodiment, an example in which the synchronization signal C is transmitted and the operation of the current collector is controlled to function as the master-side inverter device has been described, but the present invention is not limited to this. Not limited. For example, the function as the master-side inverter device may mean that the power output system has a function of transmitting the synchronization signal C when the power output system is not provided with the current collector. In addition to transmitting the synchronization signal C and controlling the operation of the current collector, the master-side inverter device may perform control to set each command value of the slave-side inverter device.

  Further, in the above-described embodiment, an example in which the control information source information, the operation command information, and the output voltage information are provided in the operation information has been shown, but the present invention is not limited to this. For example, the operation information may be provided with only one of the control power supply information, the operation command information, and the output voltage information (for example, only the control power supply information), or the operation information may be the control power supply information, the operation command information, Also, information different from the output voltage information may be provided.

  Further, in the above embodiment, the example in which the first inverter device and the second inverter device are configured to perform serial communication via the signal line has been shown, but the present invention is not limited to this. For example, when the increase in the number of signal lines is allowed, the first inverter device and the second inverter device may be configured to perform parallel communication via the signal line.

  Further, in the above embodiment, an example in which the AC power output from another inverter device is cut off by controlling the opening / closing of the relay provided in the current collector has been shown, but the present invention is not limited to this. Absent. For example, a breaker that can be controlled by another inverter device may be provided on the output side of each inverter device instead of providing the power output system on the current collector.

1 First inverter device (power converter)
2 Second inverter device (power conversion device)
3 Current Collector 5 Communication Lines 7a, 7b Signal Line 12 First Power Converter (Power Converter)
13 First control unit (control unit)
22 Second power converter (power converter)
23 Second Control Unit (Control Unit)
31, 32, 33, 34 Relay 100 Power output system

Claims (12)

One of the plurality of power conversion devices that are connected in parallel to each other and output electric power,
A power converter that outputs the power,
A synchronization signal for synchronizing the phase of the power output from the other power conversion device and the phase of the power output from the power conversion unit, a communication line between the other power conversion device. And a control unit for controlling transmission and reception via
The control unit acquires operation information from the other power conversion device via a signal line configured separately from the communication line, and detects an abnormality in communication via the communication line, A power converter that performs control to shut off the power output from the other power converter based on the acquired operation information.   The control unit controls the transmission and reception of the operation information with the other power conversion device via the communication line, and the synchronization signal with the other power conversion device with the signal. The power conversion device according to claim 1, wherein the power conversion device is configured to perform control not to transmit / receive via a line.   The control unit is a case where the power conversion device of its own is a slave-side power conversion device that operates based on the synchronization signal acquired from the master-side power conversion device among the other power conversion devices, and, When detecting an abnormality in communication via a communication line, and when the acquired operation information indicates that the other power conversion device is abnormal, the power conversion device of the self is changed from the slave side power conversion device. The power conversion device according to claim 1, wherein the power conversion device is changed to the master power conversion device, and control is performed to cut off the power output from the other power conversion device.   The control unit detects an abnormality in communication via the communication line when the own power conversion device is the master power conversion device that transmits the synchronization signal to the slave power conversion device. The power conversion according to claim 3, further comprising: controlling the power output from the slave-side power conversion device when the acquired operation information indicates that the slave-side power conversion device is normal. apparatus.   The control unit, when the power converter of its own is the slave-side power converter, and detects an abnormality in communication via the communication line, and the acquired operation information is the master-side power. The power converter device according to claim 3 or 4 which performs control which intercepts electric power outputted from said own power converter device, when it shows that a converter device is normal. The operation information includes control power supply information indicating whether or not power is supplied to the control unit of the other power conversion device,
The control unit of the power converter of its own detects the abnormality of communication via the communication line, and the control power source information indicating that power is not supplied to the controller of the other power converter. The power conversion device according to any one of claims 1 to 5, wherein the control device cuts off the power output from the other power conversion device when the power conversion device acquires. The operation information includes the control power supply information, operation command information indicating the presence or absence of an operation command by the control unit of the other power conversion device, and output voltage information indicating the presence or absence of an output voltage of the other power conversion device. Including,
The control unit of the power conversion apparatus of its own detects the abnormality of the communication via the communication line, and the control power source information indicating that power is being supplied to the control section of the other power conversion apparatus. The power conversion device according to claim 6, further comprising: based on the operation command information and the output voltage information, controlling to cut off the power output from the other power conversion device.   The control unit of the power converter of its own detects an abnormality in communication via the communication line, and acquires the operation command information indicating that there is no operation command, or the communication line The control for shutting off the power output from the other power conversion device is performed when an abnormality in communication via the power conversion device is detected and the output voltage information indicating that there is no output voltage is acquired. The power converter according to 1.   The power conversion device according to claim 1, wherein the control unit is configured to perform serial communication with the other power conversion device via the signal line.   The control unit is a current collector that collects AC power output from the plurality of power converters based on detection of an abnormality in communication through the communication line and the acquired operation information. The power conversion device according to any one of claims 1 to 9, wherein the power conversion device according to any one of claims 1 to 9 is controlled by controlling the opening and closing of a relay provided in the power conversion device.   The control unit performs control to determine that an abnormality in communication via the communication line is detected when reception of a communication signal from the other power conversion device fails a plurality of times via the communication line, Item 11. The power conversion device according to any one of items 1 to 10. A plurality of power conversion devices whose output sides are connected in parallel with each other and output electric power,
While connecting the plurality of power converters, a communication line that transmits a synchronization signal for synchronizing the phases of the power output from the plurality of power converters,
A signal line configured separately from the communication line, connecting the plurality of power conversion devices, and transmitting operation information of each of the plurality of power conversion devices,
Each of the plurality of power conversion devices acquires the operation information from another power conversion device different from its own power conversion device, detects an abnormality in communication via the communication line, and acquires the acquired operation. A power output system including a control unit that controls to cut off the power output from the other power conversion device based on the information.

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