Control method and system for parallel connection of multiple inverters

A multi-inverter and control method technology, applied in system integration technology, information technology support system, output power conversion device, etc., can solve the problem of easy interference in the communication process, so as to solve the problem of easy interference and improve stability. Effect

Active Publication Date: 2021-09-24
BEIJING IN POWER ELECTRIC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] In view of this, the purpose of the present invention is to provide a multi-inverter parallel control method and system to alleviate the technical problem that the communication process is easily disturbed in the existing multi-inverter parallel control method

Method used

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  • Control method and system for parallel connection of multiple inverters
  • Control method and system for parallel connection of multiple inverters

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Embodiment 1

[0030] According to an embodiment of the present invention, an embodiment of a control method for parallel connection of multiple inverters is provided. It should be noted that the steps shown in the flow chart of the accompanying drawings can be implemented in a computer system such as a set of computer-executable instructions and, although a logical order is shown in the flowcharts, in some cases the steps shown or described may be performed in an order different from that shown or described herein.

[0031] figure 1 is a flow chart of a control method for parallel connection of multiple inverters according to an embodiment of the present invention, such as figure 1 As shown, the method is applied to the main control unit, including the following steps:

[0032]Step S102, obtaining initial signal values ​​sent by multiple inverters, wherein the multiple inverters are connected in parallel, and each inverter is connected to the main control unit, and the initial signal value...

Embodiment 2

[0054] The embodiment of the present invention also provides a multi-inverter parallel control system, the multi-inverter parallel control system is used to implement the multi-inverter parallel control method provided in the above content of the embodiment of the present invention, the following is The specific introduction of the multi-inverter parallel control system provided by the embodiment of the present invention.

[0055] Such as figure 2 as shown, figure 2 It is a schematic diagram of the above-mentioned multi-inverter parallel control system, the multi-inverter parallel control system includes: a main control unit 10 and a plurality of inverters 20, wherein the main control unit and the plurality of inverters Inverters are connected, and the multiple inverters are connected in parallel, the main control unit includes: a first signal receiving port 11, a first MCU12 and a first signal sending port 13;

[0056] The first signal receiving port 11 is used to obtain ...

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Abstract

The invention provides a control method and system for parallel connection of multiple inverters, and relates to the technical field of inverters, and the method comprises the steps: obtaining initial signal values sent by a plurality of inverters, wherein the plurality of inverters are connected in parallel, and each inverter is connected with a main control unit; determining PWM comparator values of the plurality of inverters based on the initial signal values; generating data frames of the plurality of inverters based on the PWM comparator values of the plurality of inverters and the synchronization signals of the plurality of inverters; sending the data frames of the plurality of inverters to the plurality of inverters in a preset signal transmission mode, so that the plurality of inverters carry out PWM synchronous operation and PWM comparator value updating operation based on the data frames of the plurality of inverters, and the preset signal transmission mode comprises at least one of optical fiber signal transmission, differential signal transmission and CAN bus transmission. The technical problem that in an existing multi-inverter parallel control method, the communication process is prone to being interfered is solved.

Description

technical field [0001] The present invention relates to the technical field of inverters, in particular to a control method and system for parallel connection of multiple inverters. Background technique [0002] High-power inverters are limited by the withstand voltage or current of power devices, and often require multiple low-power inverters to output in parallel. Because the production process error of the inverter unit is likely to cause inconsistent impedance between the units, and because the switching time of the power device between the units is inconsistent, there is a relatively large circulating current between the inverters, which affects the stable operation of the system. [0003] The carrier synchronization technology adopted by the existing inverter usually adopts the method of synchronous pulse, and the slave reloads the carrier after receiving the synchronization signal to ensure the synchronization with the master. For example, the patent "multi-inverter ...

Claims

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Application Information

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IPC IPC(8): H02M7/5395H02M1/44H02J3/38H02J3/46H02J13/00
CPCH02M7/5395H02M1/44H02J3/388H02J3/46H02J13/00017H02J2300/24Y04S10/12Y04S40/124Y02E40/70Y02E60/00Y02E10/56
Inventor 彭喻周洁姜向龙张洪涛
Owner BEIJING IN POWER ELECTRIC
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