双电压闭环控制谐波电流检测方法的改进  

Improvement of Detection Method for Harmonic Currents Based on Double Voltage Close-Loop Control

作　　者：王晓远[1] 裴钰[1] 杨飞[1] 

机构地区：[1]天津大学电气与自动化学院,天津300072

出　　处：《电力系统及其自动化学报》2006年第1期48-52,共5页Proceedings of the CSU-EPSA

摘　　要：针对在负载电流有较大突变时补偿电路会产生较大畸变,以及三相电压畸变时ip-iq检测法存在的误差等问题,提出了一种改进的ip-iq检测法。在该检测法中加入了双电压闭环控制,以消除负载电流突变时产生的畸变;并采用一种新颖的基于低通滤波的A相正序电压提取单元代替原始ip-iq检测法的PLL锁相环,在三相电压畸变情况下仍可以正确提取A相正序电压,以精确检测出谐波和无功电流。研究和仿真结果表明,改进的ip-iq检测法在各种情况下都具有很好的补偿效果。Obvious distortion is caused by compensation circuits when load current varies promptly in a large scope. Distinct error occurs when ip-iq detecting approach is used in the case of unbalanced 3-phase voltage. As a solution, a developed detecting approach is proposed. Double close-loop control for DC link voltage is added to the method to achieve nice tracing performance of compensating current. A novel low pass lilting based positive-sequence voltage extracting unit substitutes for the original ip-iq PLL to ensure exact voltage of phase A is extracted even in case of imbalance three-phase voltage. Results of simulation show satisfying compensating effect with proposed detecting approach whereas mentioned original methods suffer errors.

关 键 词：有源滤波器 补偿电流 谐波 闭环控制 

分 类 号：TM76[电气工程—电力系统及自动化]