Frequency converter parallel system and driving device thereof

Abstract

The utility model discloses a frequency converter parallel system and a driving device thereof, and relates to the technical field of frequency converter control, the driving device of the frequency converter parallel system comprises a control module and a plurality of main driving adapter plates; one end of each main driving adapter plate is in communication connection with the control module, and the other end of each main driving adapter plate is electrically connected with different main frequency converters in the frequency converter parallel system; the main drive adapter plate is used for carrying out information interaction with the connected main frequency converter and the control module, and is used for controlling the operation of the connected main frequency converter. According to the utility model, the control of the plurality of frequency converters in the frequency converter parallel system can be realized simply and conveniently with low cost.

Description

Technical Field

[0001] The utility model relates to the technical field of frequency converter control, in particular to a frequency converter parallel system and a driving device thereof. Background Art

[0002] The current mainstream low-voltage inverters on the market can achieve a maximum power output of 500 kilowatts per unit. Applications that exceed this power limit typically employ a strategy of operating multiple inverters in parallel, leveraging a master-slave control mode to achieve coordinated operation and meet the demand for higher power output.

[0003] When multiple inverters are used in parallel, that is, when driving each inverter in the parallel inverter system simultaneously, one inverter is typically used as the master, and the remaining inverters as slaves. Communication between the master and slaves, and between the slaves themselves, occurs via fiber optics or a bus. However, this approach typically requires each inverter to be equipped with a high-performance MCU (Microcontroller Unit), and each inverter must establish communication with each other to ensure redundancy. This means that if the master goes offline, a slave can take over control of the remaining slaves. This not only increases the control cost and complexity of the parallel inverter system, but also increases the control complexity of the system. Utility Model Content

[0004] The main purpose of the utility model is to provide a drive device for a frequency converter parallel system, aiming to realize the control of multiple frequency converters in the frequency converter parallel system in a simple and low-cost manner.

[0005] To achieve the above-mentioned object, the present invention provides a drive device for a parallel inverter system, the drive device comprising:

[0006] Control module;

[0007] Multiple main drive adapter boards, one end of each main drive adapter board is communicatively connected to the control module, and the other end of each main drive adapter board is electrically connected to different main inverters in the inverter parallel system; the main drive adapter board is used to exchange information with the connected main inverter and the control module, and to control the operation of the connected main inverter.

[0008] In one embodiment, the control module includes a main control board and a data transceiver board;

[0009] One end of the data transceiver board is electrically connected to the main control board, and the other end of the data transceiver board is communicatively connected to each of the main drive adapter boards.

[0010] In one embodiment, the main control board is an MCU board, and the data transceiver board is an FPGA board.

[0011] In one embodiment, the data transceiver board is a fiber optic transceiver board;

[0012] One end of the optical fiber transceiver board is electrically connected to the main control board, and the other end of the optical fiber transceiver board is communicatively connected to each of the main drive adapter boards through optical fibers.

[0013] In one embodiment, the main driving adapter board includes a communication circuit and a first control circuit;

[0014] The communication circuit is used to communicate with the control module, and the first control circuit is electrically connected to the main inverter in the inverter parallel system;

[0015] The first control circuit is used to forward the inverter control signal output by the control module to the main inverter connected to the first control circuit, so as to control the operation of the connected main inverter.

[0016] In one embodiment, the master drive adapter board further includes a second control circuit, a fault feedback circuit and / or a converter operation feedback circuit electrically connected to the master converter in the converter parallel system;

[0017] The second control circuit is used to forward the electronic device control signal output by the control module to the main frequency converter connected to the second control circuit, so as to control the operation of the electronic device connected to the main frequency converter;

[0018] The fault feedback circuit is used to forward the fault signal output by the main frequency converter connected to the fault feedback circuit to the control module;

[0019] The inverter working feedback circuit is used to collect working information of the main inverter connected to the inverter working feedback circuit and send the working information to the control module.

[0020] In one embodiment, the main driving adapter board is an FPGA board.

[0021] In one embodiment, the driving device further comprises at least one redundant module;

[0022] The first end of the redundant module is electrically connected to the control module, the second end of the redundant module is communicatively connected to the control module, and the third end of the redundant module is electrically connected to the standby inverter in the inverter parallel system;

[0023] The redundancy module is used to control the operation of the standby inverter.

[0024] In one embodiment, the redundancy module includes a backup control board and at least one backup drive adapter board;

[0025] The standby control board is electrically connected to the control module, one end of the standby drive adapter board is communicatively connected to the control module, and the other end of the standby drive adapter board is electrically connected to the standby inverter in the inverter parallel system.

[0026] In addition, to achieve the above-mentioned purpose, the present invention also provides a frequency converter parallel system, which includes multiple frequency converters and a drive device of the above-mentioned frequency converter parallel system; each of the frequency converters is connected to the drive device.

[0027] The utility model provides a drive device for a parallel frequency converter system, which includes a control module and multiple main drive adapter plates, one end of each main drive adapter plate is communicatively connected to the control module, and the other end of each main drive adapter plate is electrically connected to different main frequency converters in the parallel frequency converter system; the main drive adapter plate is used to exchange information with the connected main frequency converter and the control module, and is used to control the operation of the connected main frequency converter.

[0028] Therefore, the present invention provides a control module and a master drive adapter plate between the control module and each master inverter in the parallel inverter system. Thus, the control module can control multiple master inverters in the parallel inverter system by exchanging information with the connected master inverters and the control module through the master drive module, and controlling the operation of the connected master inverters through the master drive module. This eliminates the need to distinguish between master and slave inverters and also eliminates the need for communication between each inverter.

[0029] In summary, it can be seen that the drive device of the inverter parallel system provided by the present invention can realize the control of multiple inverters in the inverter parallel system simply and at low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0031] Figure 1 A schematic structural diagram of a drive device for a parallel inverter system according to a first embodiment of the present invention;

[0032] Figure 2 A schematic structural diagram of a drive device for a parallel inverter system according to a second embodiment of the present invention;

[0033] Figure 3 A schematic structural diagram of a control module provided in a second embodiment of the present invention;

[0034] Figure 4 A schematic structural diagram of a main drive adapter plate provided in a third embodiment of the present utility model;

[0035] Figure 5 Another structural diagram of the main drive adapter plate provided in the third embodiment of the present utility model;

[0036] Figure 6 A schematic structural diagram of a drive device for a parallel inverter system according to a fourth embodiment of the present invention;

[0037] Figure 7 A schematic structural diagram of a redundant module in a drive device of a parallel inverter system provided by a fourth embodiment of the present utility model, comprising a standby control board and at least one standby drive adapter board;

[0038] Figure 8 This is a schematic diagram of the overall structure of the drive device of the inverter parallel system provided by an embodiment of the present utility model.

[0039] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments.

[0040] Description of Figure Numbers:

[0041] 10. Control module; 20. Redundancy module; 201. Communication circuit; 202. First control circuit; 203. Second control circuit; 204. Fault feedback circuit; 205. Inverter operation feedback circuit; P1~Pn, main drive adapter board; Pv, backup drive adapter board; U1, main control board; U2, backup control board; S1, data transceiver board. DETAILED DESCRIPTION

[0042] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0044] It should be noted that the descriptions of "first", "second", etc. in this utility model are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0045] The current mainstream low-voltage inverters on the market can achieve a maximum power output of 500 kilowatts per unit. Applications that exceed this power limit typically employ a strategy of operating multiple inverters in parallel, leveraging a master-slave control mode to achieve coordinated operation and meet the demand for higher power output.

[0046] When multiple inverters are used in parallel, that is, when driving each inverter in the parallel inverter system simultaneously, one inverter is typically used as the master, and the remaining inverters as slaves. Communication between the master and slaves, and between the slaves themselves, occurs via fiber optic communication or a bus. However, this approach typically requires each inverter to be equipped with a high-performance MCU, and each inverter must establish communication with each other to ensure redundancy. This means that if the master goes offline, a slave can take over control of the remaining slaves. This not only increases the control cost and complexity of the parallel inverter system, but also increases the control complexity of the system.

[0047] Based on this, the present invention provides a drive device for a parallel inverter system. In the first embodiment of the present invention, please refer to Figure 1 The drive device may include: a control module 10 and multiple main drive adapter boards P1~Pn; one end of each main drive adapter board P1~Pn is communicatively connected to the control module 10, and the other end of each main drive adapter board P1~Pn is respectively electrically connected to different main inverters in the inverter parallel system; the main drive adapter board is used to exchange information with the connected main inverter and the control module 10, and is used to control the operation of the connected main inverter.

[0048] It should be noted that the main drive adapter board can be an FPGA (Field-Programmable Gate Array) board, and an FPGA board refers to a circuit board equipped with an FPGA chip. The main drive adapter board is used to exchange information with the connected main inverter and control module 10. In essence, it means that the main drive adapter board can send information / signals to the connected main inverter and control module 10, and can also receive information / signals output by the connected main inverter and control module 10. When the main drive adapter board controls the operation of the connected main inverter, it actually controls the operation of the connected main inverter based on the control information sent by the control module 10.

[0049] Additionally, it should be noted that the inverters included in the inverter control system can be divided into primary and backup inverters. The primary inverter is the inverter that performs the primary power conversion task when the inverter control system is operating normally; the backup inverter is the inverter that takes over the primary inverter's operation in the event of a failure. The primary drive adapter board is the drive adapter board used to control the primary inverter, while the backup adapter board is the drive adapter board used to control the backup inverter.

[0050] This embodiment employs a control module 10 and a master drive adapter board between the control module 10 and each master inverter in the parallel inverter system. Thus, the control module 10 can control multiple master inverters in the parallel inverter system by exchanging information with the connected master inverters and the control module 10 through the master drive module, and by controlling the operation of the connected master inverters through the master drive module. This eliminates the need to distinguish between master and slave inverters and also eliminates the need for communication between each inverter.

[0051] In summary, it can be seen that the drive device for the inverter parallel system provided in this embodiment can realize the control of multiple inverters in the inverter parallel system in a simple and low-cost manner.

[0052] Based on the above first embodiment, a second embodiment of the drive device of the inverter parallel system of the utility model is proposed. In the second embodiment, please refer to Figure 2 The control module 10 may include a main control board U1 and a data transceiver board S1; one end of the data transceiver board S1 is electrically connected to the main control board U1, and the other end of the data transceiver board S1 is communicatively connected to each main drive adapter board P1~Pn.

[0053] It should be noted that the main control board U1 can be an MCU board, which is an integrated circuit board that integrates multiple functions such as a processor core, memory, input and output interface (I / O interface), timer / counter, and interrupt system; the data transceiver board S1 can be a PFGA board. The way in which the data transceiver board S1 establishes a communication connection with each main driver adapter board P1~Pn is related to the type of communication interface of the data transceiver board S1. For example, if the communication interface of the data transceiver board S1 is an optical fiber interface, then the data transceiver board S1 needs to communicate with each main driver adapter board P1~Pn via optical fiber. The main control board U1 and the data transceiver board S1 can be integrated on the same circuit board, or they can be deployed on two independent circuit boards.

[0054] In this embodiment, the control module 10 includes a master control board U1 and a data transceiver board S1. The master control board U1 is used to transmit control information to the inverter. The data transceiver board S1 then transmits the control information transmitted by the master control board U1 to each of the master drive adapter boards P1-Pn via optical fiber communication. Consequently, each of the master drive adapter boards P1-Pn can control the operation of its connected master inverter based on the received control information.

[0055] In a feasible embodiment, the data transceiver board S1 can be a fiber optic transceiver board; one end of the fiber optic transceiver board is electrically connected to the main control board U1, and the other end of the fiber optic transceiver board is communicatively connected to each main drive adapter board P1~Pn through optical fiber.

[0056] It should be noted that a fiber optic transceiver board is a device used for fiber optic communication. It can convert electrical signals into optical signals for signal transmission, and can also convert optical signals into electrical signals for signal reception.

[0057] In this embodiment, by setting the data transceiver board S1 as a fiber optic transceiver board, information interaction between the control module 10 and each main drive adapter board P1~Pn is realized by using fiber optic communication, thereby reducing the communication cost of the drive device of the inverter parallel control system.

[0058] For example, taking the case where the main control board U1 and the data transceiver board S1 are integrated on the same circuit board, and the data transceiver board S1 is an optical fiber transceiver board, the following can be obtained: Figure 3 The structural diagram of the control module 10 is shown.

[0059] Based on the above first embodiment and / or second embodiment, a third embodiment of the drive device of the inverter parallel system of the present utility model is proposed. In the third embodiment, please refer to Figure 4The main drive adapter board may include a communication circuit 201 and a first control circuit 202; the communication circuit 201 is used to communicate with the control module 10, and the first control circuit 202 is electrically connected to the main inverter in the inverter parallel system; the first control circuit 202 is used to forward the inverter control signal output by the control module 10 to the main inverter connected to the first control circuit 202 to control the operation of the connected main inverter.

[0060] It should be noted that the communication circuit 201 may be an optical fiber communication circuit composed of components such as an optical transmitter, an optical receiver, and an optical fiber, or a bus circuit composed of a CAN (Controller Area Network) bus or an SPI (Serial Peripheral Interface) bus. The first control circuit 202 may include a power amplifier, an isolation driver, a switching element for driving the main circuit, etc. This embodiment does not specifically limit the structural composition of the communication circuit 201 and the first control circuit 202.

[0061] In one possible implementation, please refer to Figure 5 The main drive adapter board may also include a second control circuit 203, a fault feedback circuit 204 and a converter working feedback circuit 205 electrically connected to the main converter in the converter parallel system; the second control circuit 203 is used to forward the electronic device control signal output by the control module 10 to the main converter connected to the second control circuit 203, so as to control the operation of the electronic equipment connected to the connected main converter; the fault feedback circuit 204 is used to forward the fault signal output by the main converter connected to the fault feedback circuit 204 to the control module 10; the converter working feedback circuit 205 is used to collect the working information of the main converter connected to the converter working feedback circuit 205, and send the working information to the control module 10.

[0062] It should be noted that the electronic device may be a fan, a relay, or other device. The fault signal is used to indicate that a fault has occurred in the inverter. The operating information of the inverter may include, but is not limited to, the voltage signal, current signal, etc. of the inverter. The second control circuit 203 may include a power amplifier, an isolation driver, a switching element for driving the main circuit, etc.; the fault feedback circuit 204 may include an overcurrent protection circuit and / or an undervoltage protection circuit, etc.; the inverter working feedback circuit 205 may include a sampling resistor, or include a voltage sensor and a current sensor. This embodiment does not specifically limit the structural composition of the second control circuit 203, the fault feedback circuit 204, and the inverter working feedback circuit 205.

[0063] Based on the above-mentioned first embodiment, second embodiment and / or third embodiment, a fourth embodiment of the drive device of the inverter parallel system of the present utility model is proposed. In the fourth embodiment, please refer to Figure 6 The drive device may further include at least one redundant module 20; a first end of the redundant module 20 is electrically connected to the control module 10, a second end of the redundant module 20 is communicatively connected to the control module 10, and a third end of the redundant module 20 is electrically connected to a backup inverter in the inverter parallel system; the redundant module is used to control the operation of the backup inverter.

[0064] It should be noted that the redundancy module 20 can control the standby inverter to start working after one or more active inverters in the inverter parallel system fail, so as to avoid increased or excessive power consumption of the remaining active inverters in the inverter parallel system.

[0065] In one possible implementation, please refer to Figure 7 The redundant module 20 may include a standby control board U2 and at least one standby drive adapter board Pv; the standby control board U2 is electrically connected to the control module 10, one end of the standby drive adapter board Pv is communicatively connected to the control module 10, and the other end of the standby drive adapter board Pv is electrically connected to the standby inverter in the inverter parallel system.

[0066] It should be noted that the backup control board U2 can be an MCU board, and the backup drive adapter board Pv can be a PFGA board. The backup control board U2 needs to be a dual-machine backup with the main control board U1. This ensures that if one or more main inverters in the inverter parallel system fail, the backup control board U2 can control the backup inverters with the help of the backup drive adapter board Pv to start working.

[0067] For example, in order to help understand the overall structural composition of the drive device of the inverter parallel system obtained by combining the above embodiments, the drive device of the inverter parallel system includes a redundant module 20, the redundant module 20 includes a spare control board U2 and a spare drive adapter board Pv, the main control board U1 and the spare control board U2 are MCU boards, the main drive adapter board, the spare drive adapter board Pv and the data transceiver board S1 are FPGAs, and the main drive adapter board and the spare drive adapter board Pv include a communication circuit 201, a first control circuit 202, a second control circuit 203, a fault feedback circuit 204 and an inverter working feedback circuit 205. For example, the following can be obtained. Figure 8 The schematic diagram of the structure of the drive device of the inverter parallel system is shown.

[0068] It should be noted that this example is only used to assist in understanding the present invention and does not constitute a limitation on the structure of the drive device of the inverter parallel system of the present invention. More simple transformations based on this technical concept are all within the scope of protection of the present invention.

[0069] The present invention also provides a parallel inverter system, comprising a plurality of inverters and a drive device for the parallel inverter system, wherein each inverter is connected to the drive device. The structure of the drive device for the parallel inverter system can be referred to in the above-described embodiment and will not be further described here. As the parallel inverter system of this embodiment includes all technical solutions of all embodiments of the drive device for the parallel inverter system, and the technical effects achieved are identical, further description will not be given here.

[0070] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A drive device for a parallel inverter system, characterized in that: The driving device comprises: Control module; Multiple main drive adapter boards, one end of each main drive adapter board is communicatively connected to the control module, and the other end of each main drive adapter board is electrically connected to different main inverters in the inverter parallel system; the main drive adapter board is used to exchange information with the connected main inverter and the control module, and to control the operation of the connected main inverter.

2. The drive device of the inverter parallel system according to claim 1, characterized in that: The control module includes a main control board and a data transceiver board; One end of the data transceiver board is electrically connected to the main control board, and the other end of the data transceiver board is communicatively connected to each of the main drive adapter boards.

3. The drive device of the inverter parallel system according to claim 2, characterized in that: The main control board is an MCU board, and the data transceiver board is an FPGA board.

4. The drive device of the inverter parallel system according to claim 3, characterized in that: The data transceiver board is a fiber optic transceiver board; One end of the optical fiber transceiver board is electrically connected to the main control board, and the other end of the optical fiber transceiver board is communicatively connected to each of the main drive adapter boards through optical fibers.

5. The drive device of the inverter parallel system according to any one of claims 1 to 4, characterized in that: The main drive adapter board includes a communication circuit and a first control circuit; The communication circuit is used to communicate with the control module, and the first control circuit is electrically connected to the main inverter in the inverter parallel system; The first control circuit is used to forward the inverter control signal output by the control module to the main inverter connected to the first control circuit, so as to control the operation of the connected main inverter.

6. The drive device of the inverter parallel system according to claim 5, characterized in that: The master drive adapter board further includes a second control circuit, a fault feedback circuit and / or a converter operation feedback circuit electrically connected to the master converter in the converter parallel system; The second control circuit is used to forward the electronic device control signal output by the control module to the main frequency converter connected to the second control circuit, so as to control the operation of the electronic device connected to the main frequency converter; The fault feedback circuit is used to forward the fault signal output by the main frequency converter connected to the fault feedback circuit to the control module; The inverter working feedback circuit is used to collect working information of the main inverter connected to the inverter working feedback circuit and send the working information to the control module.

7. The drive device of the inverter parallel system according to claim 5 or 6, characterized in that: The main driving adapter board is an FPGA board.

8. The drive device of the inverter parallel system according to any one of claims 1 to 4, characterized in that: The drive device further includes at least one redundant module; The first end of the redundant module is electrically connected to the control module, the second end of the redundant module is communicatively connected to the control module, and the third end of the redundant module is electrically connected to the standby inverter in the inverter parallel system; The redundancy module is used to control the operation of the standby inverter.

9. The drive device of the inverter parallel system according to claim 8, characterized in that: The redundancy module includes a standby control board and at least one standby drive adapter board; The standby control board is electrically connected to the control module, one end of the standby drive adapter board is communicatively connected to the control module, and the other end of the standby drive adapter board is electrically connected to the standby inverter in the inverter parallel system.

10. A frequency converter parallel system, characterized in that: The inverter parallel system includes a plurality of inverters and a drive device of the inverter parallel system according to any one of claims 1 to 9; each of the inverters is connected to the drive device.

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