一种改进的单相电路谐波与无功电流检测方法

针对低通滤波器对谐波检测延时影响较大的问题,提出了一种改进的单相电路谐波与无功电流检测方法,用1个基波周期内的数字积分代替低通滤波器,每个采样点处只需进行数次简单运算即可准确检测出谐波与无功电流,检测延时固定为1个基波周期。针对电力系统谐波大多数为奇次谐波的特点,对算法进一步改进,将积分时间减少一半,运算量不变而检测延时变为半个基波周期。该方法计算量小、延时短、易于实现。仿真结果验证了方法的有效性。

Improved Detecting Method for Harmonics and Reactive Currents in Single-phase Circuits

The low pass filter has great influence on the delay of harmonics detection. An improved detecting method for single-phase harmonics and reactive currents is proposed. The low pass filter is replaced by digital integration in a base cycle. It takes only several simple computations to detect harmonics and reactive currents at each sampling point. The detecting delay is fixed at one fundamental cycle. Considering that the harmonics of power systems are mostly odd harmonics,the algorithm is further improved. T...