Parallel Control Strategy of Multiple Inverters Based on Improved Droop

LOU Junjie; SU Shiping; NI Liang; LI Zhixuan; SU Qiankun

doi:10.14044/j.1674-1757.pcrpc.2024.02.023

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Parallel Control Strategy of Multiple Inverters Based on Improved Droop

Application Technology in the Field of Clean Energy | 更新时间：2024-09-14

- Parallel Control Strategy of Multiple Inverters Based on Improved Droop
- Power Capacitor & Reactive Power Compensation Vol. 45, Issue 2, Pages: 169-176(2024)
- 作者机构：
  
  长沙理工大学电气与信息工程学院，长沙　 410114
- 作者简介：
- 基金信息：
- DOI：10.14044/j.1674-1757.pcrpc.2024.02.023
  CLC：
- Published：2024-04，
  
  Received：04 March 2023，
- 稿件说明：
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LOU JUNJIE, SU SHIPING, NI LIANG, et al. Parallel Control Strategy of Multiple Inverters Based on Improved Droop. [J]. Power capacitor & reactive power compensation, 2024, 45(2): 169-176.
DOI：

LOU JUNJIE, SU SHIPING, NI LIANG, et al. Parallel Control Strategy of Multiple Inverters Based on Improved Droop. [J]. Power capacitor & reactive power compensation, 2024, 45(2): 169-176. DOI： 10.14044/j.1674-1757.pcrpc.2024.02.023.

摘要

针对微电网孤岛运行时，传统解耦式下垂控制策略由于未能考虑线路阻抗的影响，多逆变器并联运行时存在无功功率分配不均、环流等问题，论文提出一种基于自适应电压补偿的改进下垂控制策略。文中首先针对因线路阻抗不同所带来的电压跌落问题，增加了线路压降补偿环节，在此基础上，考虑逆变器出口处电压与母线电压的一致性，改进了下垂控制式，并利用低带宽通信技术获取各逆变器输出功率信息，引入自适应电压补偿环节，提高了逆变器间无功功率的均分精度。最后，基于Matlab平台搭建文章所提控制策略的仿真模型，仿真结果验证了所提控制策略的正确性与有效性。

Abstract

In view of such problems as not consideration the influence of line impedance of the line under the traditional decoupling droop control strategy

the uneven reactive power distribution and circulating current of multiple inverters in parallel operation in the case of isolated island operation of micro grid

a kind of improved droop control strategy based on adaptive voltage compensation is proposed in this paper. Firstly

aiming at the voltage drop caused by different line impedance

the line voltage drop compensation link is added. On this basis

considering the consistency between the voltage at the outlet of the inverter and the bus voltage

the droop control type is improved

the output power information of each inverter is obtained by using low bandwidth communication technology

and the adaptive voltage compensation link is introduced to improve the accuracy of reactive power sharing between inverters. Finally

the simulation model of the proposed control strategy is set up based on Matlab platform

and the the correctness and effectiveness of the proposed control strategy is verified.

关键词

微电网下垂控制线路阻抗功率均分电压补偿

Keywords

micro griddroop controlline impedancepower sharingvoltage compensation

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