一种抑制HVDC换相失败的STATCOM补偿方案

针对高压直流输电（High Voltage Direct Current,HVDC）系统中的换相失败问题,提出一种STATCOM补偿方案。该方案将星型级联H桥STATCOM中性点直接接地,并入HVDC系统逆变端,从而具备三点优势：保留星型级联H桥STATCOM经济性高的优点;三相独立,可视为三个单相STATCOM,各相换流链独立控制,克服了传统星型级联H桥STATCOM在电网电压不平衡情况下的控制问题;利用HVDC所接入的交流电网的中性点接地的特点构成零序电流通道,不仅可以补偿谐波、正序、负序无功电流,也可以补偿零序无功电流,补偿性能较传统拓扑更为优良。详细分析了该补偿方案在HVDC中的可行性...

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Bibliographic Details
Published in电力系统保护与控制 Vol. 46; no. 5; pp. 135 - 142
Main Author 王轩;魏宏;欧朱建;付永生;喻劲松
Format Journal Article
LanguageChinese
Published 南瑞集团公司(国网电力科学研究院)有限公司, 江苏 南京 211000 01.03.2018
中电普瑞科技有限公司,北京102200%山东大学电气工程学院,山东 济南,250061
Subjects
高压直流输电;换相失败;STATCOM;中性点接地;零序电流
neutral-point grounding
zero-sequence current
零序电流
中性点接地
高压直流输电
STATCOM
commutation failure
换相失败
HVDC
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ISSN1674-3415
DOI10.7667/PSPC170230

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Summary:针对高压直流输电（High Voltage Direct Current,HVDC）系统中的换相失败问题,提出一种STATCOM补偿方案。该方案将星型级联H桥STATCOM中性点直接接地,并入HVDC系统逆变端,从而具备三点优势：保留星型级联H桥STATCOM经济性高的优点;三相独立,可视为三个单相STATCOM,各相换流链独立控制,克服了传统星型级联H桥STATCOM在电网电压不平衡情况下的控制问题;利用HVDC所接入的交流电网的中性点接地的特点构成零序电流通道,不仅可以补偿谐波、正序、负序无功电流,也可以补偿零序无功电流,补偿性能较传统拓扑更为优良。详细分析了该补偿方案在HVDC中的可行性,并推导了电网电压不平衡情况下,换流链电流指令中的零序电流分量。给出了控制策略并通过PSCAD/EMTDC对所提补偿方案用于抑制HVDC换相失败的性能进行验证。
Bibliography:HVDC; commutation failure; STATCOM; neutral-point grounding; zero-sequence current
41-1401/TM
WANG Xuan1, 2, WEI Hong1, 2, OU Zhnjian3, FU Yongsheng1, 2, YU Jinsong1, 2 （1. NARI Group Corporation （State Grid Electric Power Research Institute） Co., Ltd., Nanjing 211000, China; 2. China EPRI Science ＆ Technology Co., Ltd., Beijing 102200, China; 3. School of Electrical Engineering, Shandong University, Jinan 250061, China）
This paper proposes a STATCOM compensation scheme for suppressing commutation failure in HVDC. In this scheme, the neutral-point of CHB-STATCOM with star configuration which is connected to power grid is grounded. The scheme possesses three advantages. Firstly, it reserves high economy as CHB-STATCOM with star configuration. Secondly, three phases are independent of each other, which can be considered as three single-phase STATCOMs, leading to a simple and flexible control strategy and overcoming the control problem when CHB-STATCOM with star configuration operations under unbalance grid. Thirdl
ISSN:1674-3415
DOI:10.7667/PSPC170230