电力系统保护与控制2024，Vol.52Issue(12)：33-44,12.DOI:10.19783/j.cnki.pspc.231572
补偿不平衡负载的HC-SVG相间电压平衡控制与直流电压取值分析
HC-SVG phase-to-phase voltage balance control and DC voltage value analysis to compensate for unbalanced loads
摘要
Abstract
A hybrid cascade static var generator(HC-SVG)composed of neutral-point clamped(NPC)and cascade H-bridge(CHB)power units produces phase-to-phase voltage imbalance when compensating for unbalanced loads.To address this,a phase-to-phase voltage balance control method for the CHB power unit is established based on zero sequence voltage feedforward.The DC side voltage value of HC-SVG after zero sequence voltage injection is analyzed.First,the relationship between the fundamental voltage component of the CHB power unit and the output fundamental voltage of the HC-SVG is analyzed.The zero-sequence voltage required by the phase-to-phase voltage balance of the CHB power unit when the HC-SVG compensates for unbalanced loads is deduced and zero sequence voltage feedforward control is established.Secondly,the constraint relationship between the degree of compensation current imbalance and the HC-SVG DC side voltage is discussed based on the analytical relationship between zero sequence voltage and compensation current.Taking a 6 kV/3 Mvar device as an example,the value of the DC side voltage is analyzed and compared with the star CHB-SVG.It reveals the characteristics of low DC voltage required by the HC-SVG when compensating unbalanced loads.Simulation results show the effectiveness of clustered voltage balance control and DC side voltage value analysis.关键词
混合级联/静止无功发生器/不平衡负载/零序电压/直流侧电压取值Key words
hybrid cascade/static var generator/unbalanced loads/zero sequence voltage/DC side voltage value引用本文复制引用
杜少通,何金泽,原亚雷,朱军,李威..补偿不平衡负载的HC-SVG相间电压平衡控制与直流电压取值分析[J].电力系统保护与控制,2024,52(12):33-44,12.基金项目
This work is supported by the National Natural Science Foundation of China(No.52267018). 国家自然科学基金项目资助(52267018) （No.52267018）
