基于定关断面积的分层接入UHVDC系统换流器协调控制策略

doi:10.19912/j.0254-0096.tynxb.2020-1228

太阳能学报 ›› 2022, Vol. 43 ›› Issue (7): 316-325.DOI: 10.19912/j.0254-0096.tynxb.2020-1228

基于定关断面积的分层接入UHVDC系统换流器协调控制策略

韩平平¹, 孙浩然¹, 童青洋¹, 张炎², 陈忠³, 杨为³

1.新能源利用与节能安徽省重点实验室（合肥工业大学）,合肥 230009;
2.中国电子科技集团公司第三十八研究所,合肥 230088;
3.国网安徽省电力有限公司电力科学研究院,合肥 230601

收稿日期:2020-12-03 出版日期:2022-07-28 发布日期:2023-01-28
通讯作者: 韩平平（1981—）,女,博士、副教授,主要从事可再生能源并网技术的研究。LH021211@163.com
基金资助:
国家重点研发计划智能电网技术与装备重点专项（2016YFB0900600）

COORDINATED CONTROL STRATEGY OF CONVERTER FOR UHVDC SYSTEM UNDER HIERARCHICAL CONNECTION BASED ON CONSTANT EXTINCTION AREA

Han Pingping¹, Sun Haoran¹, Tong Qingyang¹, Zhang Yan², Chen Zhong³, Yang Wei³

1. Anhui Province Key Laboratory of Renewable Energy Utilization and Energy Saving （Hefei University of Technology）, Hefei 230009, China;
2. No. 38 Research Institute of CETC, Hefei 230088, China;
3. State Grid Anhui Electric Power Company Limited Research Institute, Hefei 230601, China

Received:2020-12-03 Online:2022-07-28 Published:2023-01-28

摘要/Abstract

摘要： 基于分层接入特高压直流输电（UHVDC）系统逆变侧高低端的耦合特性,分析叠弧面积增加引发换流器换相失败的机理,提出一种抑制分层接入UHVDC系统非故障层换流器换相失败的协调控制策略。该策略通过补偿交流故障后非故障层换流器所需的叠弧面积,使晶闸管具有足够的关断面积完成去游离过程,从而防止换相失败的发生。最后基于PSCAD/EMTDC搭建实际系统模型并进行了仿真验证,结果表明所提协调控制策略能有效抑制不同故障程度下受端电网对称和不对称故障下非故障层换流器的换相失败,可提升系统的稳定性。

关键词: 风力发电, 特高压直流输电, 分层系统, 换相, 协调控制

Abstract: The research on commutation failure suppression strategy of UHVDC system converter has important engineering significance. Based on the coupling characteristics of the high and low side of the inverter side in the UHVDC system under hierarchical connection, this paper analyzes the mechanism of commutation failure caused by the increase of the overlap area, and proposes a coordinated control strategy to suppress the commutation failure of the non-fault layer converter in the UHVDC system under hierarchical connection. The strategy compensates the overlap area required by the non-fault layer converter after AC fault, so that the thyristor has enough extinction area to complete the de dissociation process, so as to prevent commutation failure. Finally, an actual system model is built based on PSCAD/EMTDC, and the simulation results show that the proposed coordinated control strategy can effectively suppress the commutation failure of the non-fault layer converter under symmetrical and asymmetric faults of the receiving end grid under different fault degrees, and improve the stability of the system.

Key words: wind power generation, UHV power transmission, hierarchical systems, commutation, coordinated control

中图分类号:

TM721

韩平平, 孙浩然, 童青洋, 张炎, 陈忠, 杨为. 基于定关断面积的分层接入UHVDC系统换流器协调控制策略[J]. 太阳能学报, 2022, 43(7): 316-325.

Han Pingping, Sun Haoran, Tong Qingyang, Zhang Yan, Chen Zhong, Yang Wei. COORDINATED CONTROL STRATEGY OF CONVERTER FOR UHVDC SYSTEM UNDER HIERARCHICAL CONNECTION BASED ON CONSTANT EXTINCTION AREA[J]. Acta Energiae Solaris Sinica, 2022, 43(7): 316-325.

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基于定关断面积的分层接入UHVDC系统换流器协调控制策略

COORDINATED CONTROL STRATEGY OF CONVERTER FOR UHVDC SYSTEM UNDER HIERARCHICAL CONNECTION BASED ON CONSTANT EXTINCTION AREA

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