一种改进的单相电路ip-iq谐波检测方法

摘要

针对单相电路谐波的特点，以瞬时无功理论为基础，分析了单相电路ip-iq 谐波检测法。综合考虑检测的精度及实时性要求，提出一种更适合单相电路谐波检测的改进方法。该检测方法在引入反馈环节、改善检测系统实时性的基础上，采用过渡带衰减速率快、频率特性好的椭圆低通滤波器代替传统的巴特沃斯低通滤波器，减少低通滤波器的延时及对检测精度的影响。利用MATLAB/Simulink进行建模和仿真，证明改进算法提高了检测精度和动态响应速度。%In view of the features of harmonics in single-phase circuits,the study makes an analysis on harmonics ip-iq detection for single-phase circuits in the way of mathematics based on the instantaneous reactive power theory. Considering accuracy and real-time of the harmonics detection, a much more suitable method for harmonics in single-phase circuits is proposed. In order to improve the performance of the whole detection system, a feedback process is added to the system. With the application of the elliptic low-pass filter featuring high decay rate in transition zone and a good frequency characteristic instead of traditional Butterworth low pass filter, the method can reduce the influence of time delay of low-pass filter on the detection accuracy. The modeling and simulation of MATLAB/Simulink proves that the method improves the accuracy and speed of dynamic response.