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Power distribution method and system for dual-machine parallel system based on virtual synchronous machine

A technology of a virtual synchronous machine and a distribution method is applied in the field of power distribution of a two-machine parallel system, and can solve the problems of difficulty in power distribution in a parallel system of three-phase PWM rectifiers and the like.

Active Publication Date: 2020-12-04
NARI NANJING CONTROL SYST +5
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Problems solved by technology

However, the power distribution of the parallel system of three-phase PWM rectifiers based on virtual synchronous machine is a difficult problem

Method used

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  • Power distribution method and system for dual-machine parallel system based on virtual synchronous machine
  • Power distribution method and system for dual-machine parallel system based on virtual synchronous machine
  • Power distribution method and system for dual-machine parallel system based on virtual synchronous machine

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Embodiment Construction

[0037] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0038] Such as figure 1 As shown, each three-phase PWM rectifier (referred to as "rectifier" for short) in the two-machine parallel system adopts a three-phase full-bridge topology, uses six IGBTs as power electronic switching devices, and adopts an LCL filter circuit on the AC side to filter out high High-frequency current harmonics, the DC side uses a large capacitor for voltage stabilization. The whole system consists of four parts: AC grid, LCL filter circuit, three-phase rectifier bridge and load; where v a , v b , v c is the three-phase grid voltage, i gaj i gbj i gbj (j=1,2, rectifier label) is the grid side current of the rectifier, i caj i cbj i cbj is the converter side curre...

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Abstract

The invention discloses a power distribution method and system for dual-machine parallel system based on a virtual synchronous machine. According to the invention, improvement is conducted to a conventional virtual synchronous machine control algorithm, single-phase active current feedback is added, and load power and droop support power are distributed in proportion according to needs based on feedback single-phase active current and an active current feedback coefficient.

Description

technical field [0001] The invention relates to a power distribution method and system of a two-machine parallel system based on a virtual synchronous machine, belonging to the technical field of converter control. Background technique [0002] In the construction process of smart grid, more and more emphasis is placed on the important role of demand response on the load side in the frequency and voltage regulation of the power system. According to the current development trend, more and more loads will be connected to the grid through power electronic converters. For example, most electric motors require drives that contain the motor electronics, personal computers require rectifiers to convert alternating current to stable direct current, and so on. Therefore, in the construction of smart grid, it is necessary to study a unified load interface with good network-load interaction to meet the development needs. Furthermore, with the development of social production, more an...

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Application Information

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IPC IPC(8): H02J3/48H02J3/50
CPCH02J3/48H02J3/50
Inventor 孙广明张卫国陈良亮顾琳琳纪程邵军军陈嘉栋李化周材孙季泽潘爱强刘哲
Owner NARI NANJING CONTROL SYST
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