考虑负序补偿的角型链式SVG指令电流提取方法  

A Reference Current Detection Method of Delta-connected Cascaded SVG Considering Unbalance Compensation

作　　者：熊桥坡[1] 罗安[1] 马伏军[1] 帅智康[1] 黎小聪[1] 刘雷[1] 

机构地区：[1]湖南大学电气与信息工程学院,湖南省长沙市410082

出　　处：《中国电机工程学报》2013年第27期12-19,4,共8页Proceedings of the CSEE

基　　金：国家自然科学基金重点项目(51237003);国家自然科学基金青年科学基金项目(51207048);湖南省研究生科研创新项目(CX2012A006)~~

摘　　要：角型链式静止无功发生器(static var generator,SVG)理论上能够进行负序、无功和谐波电流的综合补偿。针对角型补偿器指令电流提取的难题,通过对补偿电路相量图进行几何分析,根据瞬时无功功率理论,推导出dq/变换矩阵。三相电流瞬时值经abc/dq变换、滤波,得到两相旋转坐标系下的负序有功电流分量和负序无功电流分量;再经dq/变换矩阵,可得到角型链式SVG负序补偿所需的相电流指令信号。该变换矩阵可应用于负序补偿系统,也可应用于负序、无功和谐波电流综合补偿系统。所提指令电流提取方法物理意义清晰,算法简单;采用电流瞬时值进行运算,负荷变化时,可实时更新指令电流,动态调节速度快。最后,通过PSIM仿真验证了所提方法的正确性。It is a challenge to compensate negative sequence, reactive power and harmonic currents by delta-connected cascaded static var generator （SVG） which is theoretically feasible. To solve the problem of the detection reference current for delta-connected cascaded SVG, a dq/△ transformation matrix was derived through geometric analysis of the compensation circuit phasor diagram, based on the instantaneous reactive power theory. By the abc/dq transformation and filtering, the negative sequence active current component and negative sequence reactive current component in the two-phase rotating coordinate system was got from the three-phase current instantaneous values. By dq/△ transformation, the phase current reference signal required for the negative sequence compensation with the delta-connected cascaded SVG can be obtained. The transformation matrix can be applied to the negative sequence compensation system, also can be applied to the negative sequence, reactive and harmonic current comprehensive compensation system. The proposed method of reference current detection has clear physical meaning and it is simple. When loads change, the reference current can be updated in real time and the detection method has good dynamic performances. Simulation results verify the correctness of the proposed method.

关 键 词：链式静止无功发生器 负序补偿 abc/dq变换矩阵 dq/△变换矩阵 综合补偿 

分 类 号：TM76[电气工程—电力系统及自动化]