电气工程学报 ›› 2020, Vol. 15 ›› Issue (1): 48-54.doi: 10.11985/2020.01.007

所属专题: 特邀专栏:微电网功率变换与稳定控制

• 特邀专栏: 微电网功率变换与稳定控制 • 上一篇    下一篇

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基于动态虚拟复阻抗的微网下垂控制策略

范必双,魏国强(),李泽扬,姚淦洲   

  1. 长沙理工大学电气与信息工程学院 长沙 410114
  • 收稿日期:2019-12-13 出版日期:2020-03-25 发布日期:2020-05-13
  • 通讯作者: 魏国强 E-mail:qq012369@163.com
  • 作者简介:范必双,男,1978年生,博士,副教授。主要研究方向为电力电子系统控制及电机驱动、电能质量及配电网有源消弧、风力发电变桨控制及风机叶片抗冰等技术。E-mail:10407151@qq.com;

Droop Control Method Based on Dynamic Virtual ComplexImpedance for Microgrid

FAN Bishuang,WEI Guoqiang(),LI Zeyang,YAO Ganzhou   

  1. School of Electrical & Information Engineering, Changsha University of Science and Technology, Changsha 410114 China
  • Received:2019-12-13 Online:2020-03-25 Published:2020-05-13
  • Contact: WEI Guoqiang E-mail:qq012369@163.com

摘要:

输出功率均分与系统间环流抑制是并联逆变器控制的热点问题。由于低压微网系统输电线路以阻性为主,将逆变器自身输出阻抗设计呈以阻性为主,使微网系统等效输出阻抗呈阻性,提升了有功电压无功频率PV-QF下垂方式的适用性,实现了有功功率与无功功率的解耦控制。在分析环流的产生和影响因素后,提出动态虚拟复阻抗方法对输出电压进行动态反向调整,从而对环流进行抑制,并提高系统动态响应,减小了并联冲击。最后通过搭建仿真模型,验证了所提方法的可行性。

关键词: 逆变器并联, 下垂控制, 动态虚拟复阻抗, 环流抑制, 功率均分

Abstract:

Output power sharing and circulating current suppression have been the main subjects for parallel inverters. The equivalent output impedance of the inverters is designed to be resistive using dynamic virtual complex impedance, which can improve applicability of selected PV-QF droop control and decouple the active power and reactive power. The dynamic virtual complex impedance method is proposed to further suppress the circulating current and improve performance of the power sharing and dynamic response after analyzing the generation and influencing factors of the circulating current. The feasibility of the proposed method is verified by the simulation.

Key words: Inverters in parallel operation, droop control, dynamic virtual complex impedance, circulating current suppression, power sharing

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