基于虚拟异步机和无功复合控制的并网逆变器实现方法

doi:10.11985/2020.02.016

电气工程学报 ›› 2020, Vol. 15 ›› Issue (2): 110-115.doi: 10.11985/2020.02.016

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基于虚拟异步机和无功复合控制的并网逆变器实现方法

程文¹(),苏建徽²(),王建国²()

1.中国能源建设集团安徽省电力设计院有限公司合肥 230009;
2.合肥工业大学教育部光伏系统工程研究中心合肥 230009

收稿日期:2020-01-05 出版日期:2020-06-25 发布日期:2020-07-31
作者简介:程文,男,1991年生,硕士。主要研究方向为电力变换技术。E-mail:915970710@qq.com|苏建徽,男,1963年生,博士,教授。主要研究方向为光伏发电技术、分布式发电技术。E-mail:su_chen@126.com|王建国,男,1984年生,博士。主要研究方向为新能源利用及分布式发电技术。E-mail:wangjianguo1984@163.com

Implementation Method of Grid-connected Inverters Based on Virtual Asynchronous Machine and Reactive Compound Control

CHENG Wen¹(),SU Jianhui²(),WANG Jianguo²()

1. China Energy Engineering Group Anhui Electric Power Design Institute Co., Ltd., Hefei 230009 China;
2. Research Center for Photovoltaic System Engineering of Ministry of Education, Hefei 230009 China

Received:2020-01-05 Online:2020-06-25 Published:2020-07-31

摘要/Abstract

摘要：

一种基于虚拟异步机的并网逆变器实现方法被提出,通过建立并模拟异步电动机电磁及机械暂态模型,使并网逆变电源电压及电流特性等效为实际异步电动机及其负载。在功率控制模式下,通过设定发电转矩阈值使其工作于回馈制动模式,并向电网注入有功功率;配合无功复合控制,可使电网电压运行于单位功率因素,且当有功功率变化时,电网与系统均没有无功交换。模拟转子串联电阻分级起动模式,可有效降低并网电流,且无需锁相环和预同步环节,提高了并网的可靠性与安全性。仿真结果验证了所提方案的可行性和有效性。

关键词: 虚拟异步机, 发电转矩阈值, 无功复合控制, 分级起动, 并网电流

Abstract:

An implementation method of grid-connected inverters based on virtual asynchronous machine is presented, the voltage and current characteristics of the grid-connected inverters are equivalent to the actual asynchronous machine and its load by simulating its electromagnetic and mechanical transient model. Under the power control mode, the generating torque threshold is set to make it work in the feedback braking mode, and the active power is injected into the grid. The grid voltage can be operated at the unit power factor through the cooperation of the reactive compound control, and when the active power changes, there is no reactive power exchange between the grid and the system. Step-by-step starting by the simulation of the series resistance on the rotor can effectively reduce the grid-connected current, which improve the reliability and security of grid connection without phase-locked loops and pre-synchronization. Simulation results verify the feasibility and effectiveness of the presented scheme.

Key words: Virtual asynchronous machine, generating torque threshold, reactive compound control, step-by-step starting, grid-connected current

中图分类号:

TM46

程文, 苏建徽, 王建国. 基于虚拟异步机和无功复合控制的并网逆变器实现方法[J]. 电气工程学报, 2020, 15(2): 110-115.

CHENG Wen, SU Jianhui, WANG Jianguo. Implementation Method of Grid-connected Inverters Based on Virtual Asynchronous Machine and Reactive Compound Control[J]. Journal of Electrical Engineering, 2020, 15(2): 110-115.

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基于虚拟异步机和无功复合控制的并网逆变器实现方法

Implementation Method of Grid-connected Inverters Based on Virtual Asynchronous Machine and Reactive Compound Control

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