Improved Droop Control Strategy for Reactive Power Sharing of Inverters in Low-voltage Microgrids

BAI Xiaodan; MIAO Hong; ZENG Chengbi; MO Site

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Improved Droop Control Strategy for Reactive Power Sharing of Inverters in Low-voltage Microgrids

更新时间：2025-12-08

- Improved Droop Control Strategy for Reactive Power Sharing of Inverters in Low-voltage Microgrids
- Vol. 46, Issue 4, Pages: 1310-1318(2020)
- 作者机构：
  
  四川大学电气信息学院
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：30 April 2020，
  
  Published：2020
- 稿件说明：
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BAI Xiaodan, MIAO Hong, ZENG Chengbi, et al. Improved Droop Control Strategy for Reactive Power Sharing of Inverters in Low-voltage Microgrids[J]. 2020, 46(4): 1310-1318.
DOI：

BAI Xiaodan, MIAO Hong, ZENG Chengbi, et al. Improved Droop Control Strategy for Reactive Power Sharing of Inverters in Low-voltage Microgrids[J]. 2020, 46(4): 1310-1318. DOI：

摘要

由于低压微电网在孤岛运行时

往往存在功率耦合及线路阻抗差异等问题

应用传统的下垂控制将难以实现无功功率的精确分配。针对以上问题提出了一种改进下垂控制策略

以消除不匹配的线路阻抗引起的无功功率均分误差。首先

分析了无功功率均分机理

得出线路阻抗与无功功率之间存在的关系

并基于虚拟感抗将等效线路阻抗设计成感性

以实现功率解耦;其次

引入虚拟感抗的自适应环节

并采用无功功率调节其大小

从而达到在不检测线路阻抗参数的条件下

实现补偿线路阻抗差异造成的输出电压差的目的

进而提高无功功率均分精度。最后

在Matlab/Simulink仿真平台及搭建的逆变器并联系统实验平台下

通过对比传统下垂控制和改进下垂控制功率的均分情况

验证所提方法的有效性。仿真和实验结果表明:所提改进下垂控制策略能够基于一个起决定性作用的虚拟感抗以实现功率解耦

通过中央控制器与本地控制器的通信调节虚拟感抗以消除阻抗差异

从而实现无功功率均衡分配;并且该控制方法能够推广到不同容量及多台逆变器并联运行的情况。研究结果证明了该策略能够有效解决低压微网孤岛模式时的无功不均分问题。

Abstract

Due to the existence of power coupling and the differences in feeder impedances in low-voltage microgrids

reactive power cannot be accurately shared by traditional droop control. In order to solve this problem

we put forward an improved droop control strategy to eliminate the distribution error of reactive power. Firstly

the mechanism of reactive power sharing is analyzed. The correlation between line impedance and reactive power is obtained. Then the feeder impedance is designed to be inductive based on virtual impedance to get power decoupling. Secondly

the adaptive part of virtual impedance is introduced and adjusted by reactive power

so that the output voltage differences caused by impedance differences can be compensated without detecting feeder impedance parameters. The accuracy of reactive power sharing can be further improved. Finally

the validity of the improved droop control strategy was verified on the Matlab/Simulink simulation platform and the experimental platform of the inverter parallel system by comparing the power distribution of two control strategies. The simulation and experimental results demonstrate that this improved strategy can decouple power based on a decisive virtual impedance. This virtual impedance can be adjusted by the communication between the central controller and local controller to realize the balance of reactive power. The strategy can be extended to different capacity and multiple inverters. The results show that the proposed strategy can effectively solve the problems of power sharing in the island mode of low-voltage microgrids.

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