摘要
采用小容值薄膜电容的H桥级联型静止同步补偿器(cascaded H-bridge static synchronous compensator,CHB-STATCOM)直流侧电压控制以直流侧电压平方值为被控量,在补偿功率发生跃变时相间电压不平衡加剧,传统相间电压平衡控制动态效果不佳。基于容值减小的CHB-STATCOM控制原理,推导各相直流侧电压平方值与跃变功率、电容容值的数学关系,揭示相间电压不平衡的原因,讨论直流侧电压峰值与电容电压纹波的关系。建立指令功率渐变的给定方法,分析指令功率渐变时间与相间电压不平衡的关系,揭示指令功率渐变时间对CHB-STATCOM补偿功率变化时相间电压不平衡的抑制机理。仿真和实验验证了理论分析与相间电压不平衡抑制机理的有效性。研究结论可为该类型的相间电压不平衡抑制提供理论基础。
The cascaded H-bridge static synchronous compensator(CHB-STATCOM)adopts small capacitance film capacitors,and its DC-side voltage control takes the DC-side voltage squared as the controlled quantity.The clustered voltage imbalance is aggravated when the compensation power jumps,and the traditional clustered voltage balancing control is dynamically ineffective.In this paper,based on the control principle of CHB-STATCOM with capacitance reduction,the mathematical relationship between the square of the DC voltage of each phase and the capacitor's jumping power and capacitance value is deduced.This study reveals the causes of clustered voltage imbalance and discusses the relationship between the peak DC side voltage and the capacitor voltage ripple.The given method of command power fading is established,the relationship between command power fading time and clustered voltage imbalance is analyzed,and the suppression mechanism of command power fading time on clustered voltage imbalance when CHB-STATCOM compensates for the power change is revealed.The simulation and experiment are conducted,and the effectiveness of the theoretical analysis and the clustered voltage imbalance suppression mechanism is verified.The study's conclusions can provide a theoretical basis for the clustered voltage imbalance suppression of this type.
作者
杜少通
李威
周娟
朱军
何金泽
DU Shaotong;LI Wei;ZHOU Juan;ZHU Jun;HE Jinze(School of Electrical Engineering and Automation,Henan Polytechnic University,Jiaozuo 454003,Henan Province,China;Henan Key Laboratory of Intelligent Detection and Control of Coal Mine Equipment(Henan Polytechnic University),Jiaozuo 454003,Henan Province,China;School of Electrical Engineering,China University of Mining and Technology,Xuzhou 221116,Jiangsu Province,China)
出处
《电网技术》
EI
CSCD
北大核心
2024年第11期4628-4637,I0052-I0054,I0051,共14页
Power System Technology
基金
国家自然科学基金项目(52267018)
河南省科技攻关计划项目(232102240096)。
