电气工程学报 ›› 2018, Vol. 13 ›› Issue (5): 14-20.doi: 10.11985/2018.05.003

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基于虚拟阻抗的变阻感比低压微电网功率控制策略研究

邢作霞,芦彦东,董焕宝   

  1. 沈阳工业大学电气工程学院 沈阳 110870
  • 收稿日期:2017-09-26 出版日期:2018-05-25 发布日期:2019-11-22
  • 作者简介:邢作霞 女 1976年生,博士,副教授,研究方向为风力发电系统控制与测试和智能电网与储能技术。|芦彦东 男 1995年生,硕士研究生,研究方向为电力电子在微电网中的应用。
  • 基金资助:
    国家能源应用技术研究及工程示范项目(NY20150303)

Power Decoupling Control Strategy of Variable Impedance Ratio Based on Virtual Impedance for Microgrid

Xing Zuoxia,Lu Yandong,Dong Huanbao   

  1. Shenyang University of Technology Shenyang 110870 China
  • Received:2017-09-26 Online:2018-05-25 Published:2019-11-22

摘要:

低压微电网中传统下垂控制存在耦合,且由于线路阻抗不匹配使逆变器难以精确控制输出功率,容易引起逆变器间环流。本文分析了逆变器输出功率特性,通过引入虚拟功率得出线路阻感比与下垂控制的耦合关系,提出了基于虚拟阻抗的功率解耦控制策略。策略通过增加虚拟阻抗控制环,改变逆变器输出等效阻感比,实现功率控制的解耦,同时解决了逆变器在正常运行及负载变化时功率不能均分的问题。利用Matlab/Simulink搭建了低压微电网基本结构的仿真模型,并与传统下垂控制对比,验证了本策略的有效性。

关键词: 低压微电网, 虚拟阻感比, 功率解耦, 功率均分

Abstract:

In low-voltage microgrids, coupling of traditional droop control, and mismatched feeder impedances can lead the inverter to control the output power imprecise, could cause the circulation between inverters. This paper analyzed the output power characteristics of the inverter, and concluded the coupling relationship between the line resistance ratio and the droop control by introducing the virtual power. A power decoupling control strategy based on the virtual impedance is proposed. The virtual impedance control loop which is added to this control strategy, can not only changed the output impedance ratio of the inverter to realize the decoupling of the power control, but solved the problem that actual output power could not be equally divided during normal operation and load change. Using Matlab/Simulink platform to build a basic structure of low-voltage microgrid model, and comparison the effectiveness of this strategy is verified by comparison with traditional droop control.

Key words: Low-voltage microgrid, virtual impedance ratio, power decoupling, power sharing

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