矢量理论在谐波和无功电流检测中的应用与改进  

Application and development of the vectorial theory in detection of harmonics and reactive current

作　　者：陈永延[1] 吴为麟[1] 邹家勇[1] 

机构地区：[1]浙江大学电气工程学院,浙江杭州310027

出　　处：《电力系统保护与控制》2010年第20期126-129,135,共5页Power System Protection and Control

摘　　要：基于通用瞬时无功功率理论,对矢量理论在有源电力滤波器的谐波和无功电流检测算法中的应用进行了分析和改进。改进的算法针对电网电压存在谐波分量的情况,在保证补偿前后系统有功功率保持不变及不严重影响算法运行时间的前提下,在基准电流求取过程中增加了电压基波正序分量的检测环节,保证补偿后电流与供电电压基波正序分量同相位,完全消除三相四线系统中的谐波无功和不平衡分量。通过Matlab仿真给出了有源滤波器在电压含有零序分量及谐波分量情况下基准电流的检测结果,表明了该方法的准确性。Based on the generalized instantaneous reactive power theory,the vectorial theory used in the detection of harmonics and reactive current is analyzed and improved.A ccording to the condition of component harmonics existing in the voltage,the positive-sequence fundamental voltage detection is increased during obtaining the fundamental current in the improved algorithm to eliminate the harmonics and reactive current in 3-phase 4-wire system so that the current after compensation can be in phase with the voltage.In this algorithm,the active power is unchanged before and after compensation,and the operation time won＇t be largely increased.T he simulation results when the voltage contains zero-sequence component and harmonic component provided based on matlab simulation validate the accuracy of proposed strategy.

关 键 词：有源电力滤波器 瞬时无功功率理论 谐波和无功补偿 基波正序分量 

分 类 号：TM933.1[电气工程—电力电子与电力传动]