一种无锁相环i_p-i_q检测新方法

针对常用的基于瞬时无功功率的谐波检测法计算量大、矢量变换复杂、实时性差、鲁棒性弱等问题,提出了一种基于反馈和高性能低通滤波器的无锁相环ip-iq检测新方法。该方法通过预设变换矩阵的频率实现谐波和基波电流的检测,无需坐标变换和锁相环;采用基波电流反馈技术,减小了检测误差及动态响应时间;采用低通滤波器和均值滤波器级联组成高性能低通滤波器,提高了谐波和基波检测的精度和响应速度。该方法适用于单相电路、三相三线制电力系统、三相四线制电力系统的谐波和基波电流检测。

A new i_p-i_q detection method without phase-locked loop

For problems of large calculation amount,complex vector conversion,poor real-time performance and weak robustness of common harmonic detection methods based on instantaneous reactive power,a newip-iqdetection method without phase-locked loop was presented which was based on feedback and high-performance low pass filter.In the method,frequency of transformation matrix is preset to detect harmonic and fundamental currents without coordinate conversion and phase-locked loop.Fundamental current feedback is used for reducing detection error and dynamic response time.A high-performance low pass filter is realized by cascading low pass filter and mean filter,which can improve detection accuracy and response speed.The method can be applied to detect harmonic and fundamental currents in single-phase circuit,three-phase three-wire mode power system and three-phase four-wire mode power system.