Negative-sequence Current Control Strategy for Hybrid Cascaded STATCOM in Unbalanced Power Grid

WEI Miaoyu; LU Daorong; WU Tianhong; HU Haibing; LI Zhen

doi:10.7500/AEPS20241107001

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Negative-sequence Current Control Strategy for Hybrid Cascaded STATCOM in Unbalanced Power Grid

Application Research | 更新时间：2025-09-25

- Negative-sequence Current Control Strategy for Hybrid Cascaded STATCOM in Unbalanced Power Grid
- Automation of Electric Power Systems Vol. 49, Issue 17, Pages: 186-197(2025)
- 作者机构：
  
  1.南京航空航天大学自动化学院，江苏省南京市 211106
  2.南京师范大学电气与自动化工程学院，江苏省南京市 210046
  3.江苏金帆电源科技有限公司，江苏省苏州市 215618
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China(52007081)
- DOI：10.7500/AEPS20241107001
  CLC：
- Received：07 November 2024，
  
  Revised：2025-01-15，
  
  Published Online：12 June 2025，
  
  Published：10 September 2025
- 稿件说明：
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魏缪宇,陆道荣,吴天红等.不平衡电网下混合级联型STATCOM负序电流控制策略[J].电力系统自动化,2025,49(17):186-197.

WEI Miaoyu,LU Daorong,WU Tianhong,et al.Negative-sequence Current Control Strategy for Hybrid Cascaded STATCOM in Unbalanced Power Grid[J].Automation of Electric Power Systems,2025,49(17):186-197.
魏缪宇,陆道荣,吴天红等.不平衡电网下混合级联型STATCOM负序电流控制策略[J].电力系统自动化,2025,49(17):186-197. DOI： 10.7500/AEPS20241107001.

WEI Miaoyu,LU Daorong,WU Tianhong,et al.Negative-sequence Current Control Strategy for Hybrid Cascaded STATCOM in Unbalanced Power Grid[J].Automation of Electric Power Systems,2025,49(17):186-197. DOI： 10.7500/AEPS20241107001.

摘要

不平衡电网工况下，新能源电站需要输出负序电流以支撑电网电压。中高压场景级联H桥静止同步补偿器(STATCOM)已在新能源电站得到广泛应用。由于缺少公共直流母线，级联H桥STATCOM输出负序电流能力有限。为了提高级联H桥STATCOM负序电流补偿能力，文中通过解开三相级联H桥公共端，插入三相两电平拓扑，组成混合级联STATCOM，利用两电平拓扑具备的三相不平衡有功功率输出能力，拓展其负序电流补偿范围。首先，分析了不平衡电网下混合级联STATCOM不平衡有功功率与负序电流的关系，并在级联H桥和两电平电路上分别叠加2种负序电压分量，实现级联H桥不平衡有功功率的转移和混合级联STATCOM的负序电流控制。其次，通过构建2个负序电压分量和混合级联STATCOM负序电流补偿容量间的约束关系，计算了不平衡电网工况下混合级联STATCOM的负序电流补偿范围。仿真与实验结果验证了所提负序电流控制策略的可行性。

Abstract

Under the unbalanced power grid condition

renewable energy power plants need to output negative-sequence currents to support the power grid voltage. The cascaded H-bridge static synchronous compensator (STATCOM) has been widely utilized in renewable energy power plants operating under medium- and high-voltage scenarios. Due to the lack of the common DC bus

the negative-sequence current output capability of the cascaded H-bridge STATCOM is limited. To improve the negative-sequence current compensation capability of the cascaded H-bridge STATCOM

this paper constructs a hybrid cascaded STATCOM by unraveling the common end of the three-phase cascaded H-bridge and inserting a three-phase two-level topology

to expand the negative-sequence current compensation range by taking advantage of the three-phase unbalanced active power output capability of the two-level topology. Firstly

the relationship between the unbalanced active power and the negative-sequence current of the hybrid cascaded STATCOM in the unbalanced power grid is analyzed. Two kinds of negative-sequence voltage components are superimposed on the cascaded H-bridge and the two-level circuit

respectively. The goals of transferring the unbalanced active power of the cascaded H-bridge and controlling the negative-sequence current of hybrid cascaded STATCOM can be achieved. Secondly

by constructing the constraint relationship between the two negative-sequence voltage components and the negative-sequence current compensation capacity of the hybrid cascaded STATCOM

the range of the negative-sequence current compensation of the hybrid cascaded STATCOM is calculated under unbalanced power grid conditions. The simulation and experimental results verify the feasibility of the proposed negative-sequence current control strategy.

关键词

Keywords

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