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Inverter parallel system and control method thereof

An inverter and parallel technology, which is applied in the direction of converting AC power input to DC power output, output power conversion devices, electrical components, etc., can solve the problems of poor current sharing effect, achieve good current sharing effect, and avoid current sharing. effect of error

Active Publication Date: 2014-12-24
SUNGROW SHANGHAI CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] In order to solve the above technical problems, the embodiment of the present application provides an inverter parallel system and its control method to solve the problem of poor current sharing effect of the existing inverter parallel system. The technical solution is as follows:

Method used

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  • Inverter parallel system and control method thereof
  • Inverter parallel system and control method thereof
  • Inverter parallel system and control method thereof

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Embodiment Construction

[0046] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described The embodiments are only some of the embodiments of the present application, but not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0047] See figure 1 , shows a schematic structural diagram of an inverter parallel connection system according to an embodiment of the present application.

[0048] The inverter parallel system includes a host computer 1, a centralized controller 2 and N inverters 3, where N is an integer greater than 1.

[0049] The upper computer 1 is...

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Abstract

The invention discloses an inverter parallel system and a control method thereof; the inverter parallel system comprises an integrated controller and a plurality of inverters having different DC ends, wherein AC ends of the inverters are connected in parallel so as to serve a system output end; the integrated controller is connected with a control module of each inverter; the inverter parallel system uses an indirect integrated control mode; the integrated controller generates a synchronic signal; the control modules of each inverters use a communication quantity and current sharing controller to realize current sharing control based on pqr coordinate change. Compared with an existing indirect integrated control mode, the system and method omit a phase-locking loop so as to prevent current sharing errors caused by differences of phase-locking loops of each inverter; the control strategy of the application can provide very good current sharing effects brought by three-phase four-line parallel system with unbalanced load.

Description

technical field [0001] The present application relates to the technical field of inverters, in particular to an inverter parallel system and a control method thereof. Background technique [0002] Inverter parallel systems are usually used in uninterruptible power supply systems, as emergency power supplies for users with high power supply levels, and can also be used in distributed power generation systems to form micro-grids to provide separate power to remote areas or islands. [0003] The inverter parallel system can be divided into centralized control mode, master-slave control mode, decentralized logic control mode, circular chain control mode and non-interconnected control mode according to the connection mode. The centralized control mode has the advantages of simple structure and easy energy management. In systems with large capacity and energy management, and with the introduction of fast and high-reliability communication technology, the failure rate of centralize...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/493
Inventor 刘宝其张彦虎胡兵金灵辉
Owner SUNGROW SHANGHAI CO LTD
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