浙江电力

2021, v.40;No.307(11) 78-84

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考虑延时补偿的配电网柔直网侧谐波电流抑制策略
Harmonic Current Suppression Strategy of MMC-MVDC Considering Delay Compensation

朱海勇,吴小丹,董云龙,吴永华,刘鹏,裘鹏,戚宣威
ZHU Haiyong,WU Xiaodan,DONG Yunlong,WU Yonghua,LIU Peng,QIU Peng,QI Xuanwei

摘要(Abstract):

在配电网系统中普遍存在非线性负载引起的谐波电流污染现象,通过适当控制策略的优化,基于MMC-MVDC(模块化多电平换流器中压直流)的配电网柔性直流输电系统可以实现网侧谐波电流的有效抑制。在柔直内环PI控制器的基础上,基于比例谐振控制器实现谐波电流的无静差跟踪,提出一种配电网柔直网侧电流闭环控制策略,无需谐波分离算法,采用基波和谐波电流独立、控制链路延时补偿的双序闭环控制结构,可同时实现多端系统互联、潮流优化以及谐波治理功能。利用MATLAB分析了功率控制环和谐波抑制环幅频特性,证明该控制策略具有良好的稳定性。方案应用到三端配电网柔直系统,RTDS试验结果验证了控制策略的正确性和有效性。
Harmonic current pollutions caused by nonlinear loads is a universal phenomenon in distribution systems. The medium voltage direct current distribution system based on a modular multilevel converter(MMC-MVDC) can effectively suppress the harmonic current on the network side by optimizing the appropriate control strategy. In this paper, based on the traditional inner loop PI controller, the harmonic current tracking without static difference is realized based on the proportional resonance controller, and a networkside current closed-loop control strategy of the MMC-MVDC distribution system is proposed, which dispenses with harmonic separation algorithm and employs a dual closed-loop control structure with independent fundamental and harmonic current and the control link delay compensated. It can realize multi-terminal system interconnection, power flow optimization and harmonic control at the same time. Based on MATLAB, the amplitude-frequency characteristics of the power control loop and harmonic suppression loop are analyzed, and the excellent stability of the system is verified. The scheme is applied to the three-terminal MMC-MVDC distribution system, and the RTDS test results verify the correctness and effectiveness of the control strategy.

关键词(KeyWords): MMC-MVDC;谐波抑制;谐振控制器;延时补偿
MMC-MVDC;harmonic suppression;resonance controller;time delay compensation

Abstract:

Keywords:

基金项目(Foundation): 国网浙江省电力有限公司科技项目(2021ZK07)

作者(Author): 朱海勇,吴小丹,董云龙,吴永华,刘鹏,裘鹏,戚宣威
ZHU Haiyong,WU Xiaodan,DONG Yunlong,WU Yonghua,LIU Peng,QIU Peng,QI Xuanwei

DOI: 10.19585/j.zjdl.202111012

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