不平衡负载下SVG分序控制策略研究  

Research on Sequential Control Strategy of SVG Under Unbalanced Load

作　　者：贾永博 JIA Yongbo(Department of Track Engineering,Shaanxi Railway Institute,Weinan 714000,Shaanxi,China)

机构地区：[1]陕西铁路工程职业技术学院轨道工程系,陕西渭南714000

出　　处：《电气传动》2020年第11期47-53,共7页Electric Drive

基　　金：陕西铁路工程职业技术学院2016年第二批科研基金(KY2016-32)。

摘　　要：不平衡负载接入电网会导致系统电能质量降低,通常采用静止无功发生器(SVG)实现无功补偿。针对三相四桥臂SVG拓扑结构,首先通过理论分析,提出了一种新型的分序控制策略。该策略通过信号延迟对消法(DSC)分离出电网电流和负载电流的正、负序分量,在两相静止坐标系下分别补偿电网的正序和负序电流,采用快速重复控制和PI控制相结合的方法补偿零序电流。然后在Matlab/Simulink平台进行系统仿真,最后搭建了样机进行实验验证。仿真及实验结果表明,新型分序控制策略对平衡电网电流,补偿系统无功功率有很好的效果。Unbalanced load connected to power grid will lead to the reduction of power quality,and static var generator(SVG)is usually used to realize reactive power compensation.Aiming at the three-phase four-bridge SVG topology,a new sequential control strategy was proposed through theoretical analysis.The strategy separated the positive and negative sequence components of grid current and load current by delayed signal cancellation(DSC),compensatesd the positive and negative sequence currents of grid respectively in two-phase static coordinate system,and compensated the zero sequence current by combining fast repetitive control and PI control.Then the system was simulated on the platform of Matlab/Simulink.Finally,a prototype was built for experimental verification.The simulation and experimental results show that the new sequential control strategy has a good effect on balancing grid current and compensating reactive power of the system.

关 键 词：三相四桥臂 不平衡负载 分序 重复PI控制 

分 类 号：TM761.1[电气工程—电力系统及自动化]