基于准谐振滑模扰动观测器的STATCOM海上风电场谐波抑制策略  

Quasi Resonant Sliding Mode Perturbation Observer of STATCOM for Harmonic Mitigation in Offshore Wind Farm

作　　者：郑超航 吴熙[1] 袁超[2] 王亮 顾文[2] ZHENG Chaohang;WU Xi;YUAN Chao;WANG Liang;GU Wen(School of Electrical Engineering,Southeast University,Nanjing 210096,Jiangsu Province,China;Jiangsu Frontier Electric Technology Co.,Ltd.,Nanjing 211102,Jiangsu Province,China)

机构地区：[1]东南大学电气工程学院,江苏省南京市210096 [2]江苏方天电力技术有限公司,江苏省南京市211102

出　　处：《中国电机工程学报》2025年第9期3504-3518,I0019,共16页PROCEEDINGS OF THE CHINESE SOCIETY FOR ELECTRICAL ENGINEERING

基　　金：国家自然科学基金项目(52177075);江苏省自然科学基金项目(BK20221466);国家重点研发计划项目(2022YFB2603100)。

摘　　要：海上风电场经交流海缆并网系统在电网背景谐波的作用下可能发生严重的谐波超标现象,威胁电力系统安全可靠运行。然而传统控制策略下静止同步补偿器(static synchronous compensator,STATCOM)抑制谐波时效果不佳,且存在跳闸风险。为此,该文提出一种基于准谐振滑模扰动观测器(quasi resonant sliding mode perturbation observer,QRSMPO)补偿策略的谐波抑制方法。首先,研究谐波在STATCOM上的传播路径,确定在STATCOM控制环节引入观测器实现谐波抑制的可行性;其次,利用QRSMPO实时估计并补偿谐波扰动的优势,从阻断谐波传播角度设计基于QRSMPO补偿的谐波抑制策略;进一步地,推导QRSMPO补偿策略传递函数,分析该谐波抑制策略的有效性与稳定性;最后,以江苏如东海上风电场为测试对象,验证QRSMPO补偿策略的谐波抑制性能。与现有方法相比,所提策略在不同工况下均可有效抑制海上风电场谐波,且具有较强的稳定性与鲁棒性。The harmonic exceeding phenomenon may be triggered when offshore wind farms are merged into the power grid via AC submarine cables under the influence of the background harmonic,which seriously threatens the safe and reliable operation of the power system.However,the static synchronous compensator(STATCOM)under traditional control strategies have poor mitigation performance and tripping risk when mitigating harmonics.To tackle this issue,a harmonic mitigation method based on quasi resonant sliding mode perturbation observer(QRSMPO)compensation strategy is proposed in this paper,to improve harmonic mitigation ability and operational stability of STATCOM.First,the propagation process of the harmonics on STATCOM is analyzed,and the feasibility of introducing an observer in the STATCOM control loop to achieve harmonic mitigation is determined.Then,the advantage of using QRSMPO to estimate and compensate for harmonic disturbances in real time,the harmonic mitigation strategy based on QRSMPO compensation is designed from the perspective of blocking harmonic propagation.Furthermore,the transfer function of QRSMPO compensation strategy is derived,which proves the effectiveness and stability of the proposed strategy.Finally,taking Rudong offshore wind farm as the research object,the mitigation performance of the QRSMPO is evaluated.Compared with the existing methods,the proposed strategy can effectively mitigate harmonic in the offshore wind farms under various operating conditions,and presents stronger stability and robustness.

关 键 词：海上风电场 谐波抑制 准谐振滑模扰动观测器 静止同步补偿器 

分 类 号：TM614[电气工程—电力系统及自动化]