角形链式SVG零序环流推导及电流指令获取  

Derivation of zero-sequence circulating current and detection of reference current for cascaded SVG with delta configuration

作　　者：熊桥坡[1] 罗安[1] 何志兴[1] 马伏军[1] 

机构地区：[1]湖南大学国家电能变换与控制工程技术研究中心,湖南长沙410082

出　　处：《电力自动化设备》2015年第2期75-79,96,共6页Electric Power Automation Equipment

基　　金：国家自然科学基金重点资助项目(51237003);国家高技术研究发展计划(863计划)资助项目(2011AA05A301);湖南省研究生科研创新项目(CX2012A006)~~

摘　　要：在已知线电流负序分量的前提下,对角形链式静止无功发生器(SVG)零序环流进行了推导,进而提出基于瞬时功率理论的零序环流计算方法。针对角形链式SVG相电流指令信号获取难题,提出一种由零序环流与线电流指令叠加产生相电流指令的方法,所需零序环流和线电流指令根据瞬时功率理论分别计算获得。该方法可与现有的单相链式SVG控制策略结合,实现角形链式SVG综合补偿功能。在PSIM仿真环境下搭建了链式SVG仿真模型,仿真结果表明,采用所提相电流指令获取方法可实现角形链式SVG综合补偿功能,且在负载变化时具有较快的响应速度。The zero-sequence circulating current of cascaded SVG（Static Var Generator） with delta configuration is derived from the premise that the negative-sequence component of line current is known and its calculation method based on the instantaneous power theory is then proposed. As it is difficult to acquire the reference phase current of cascaded SVG with delta configuration,a method is proposed to generate it by superposing the zero-sequence circulating current on the reference line current. The zero-sequence circulating current and reference line current are calculated based on the instantaneous power theory.Combined with the existing control strategy of single-phase cascaded SVG,the proposed method can be applied to achieve the comprehensive compensation of cascaded SVG with delta configuration. A cascaded SVG model is built in PSIM simulation environment and the simulative results show that,the comprehensive compensation of cascaded SVG with delta configuration is realized by the proposed method,with quicker response to load change.

关 键 词：SVG 链式SVG 角形连接 零序环流 相量分析 指令信号获取方法 补偿 瞬时功率理论 

分 类 号：TM76[电气工程—电力系统及自动化]