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电力牵引负荷作为大功率单相整流负荷,其电流具有随机性和不对称性,是一种严重的干扰性负荷,它给电力系统及其公共连接点其它用户的安全、经济运行带来了严重影响。文章通过对现有的单相谐波电流检测方法进行研究,提出了一种改进的谐波电流检测方法。该方法用简单的积分、延时加增益环节来代替传统方法中的低通滤波器,将检测延时减少到1/6个电源周期;并用求导代替传统方法中的相位延迟算法,不但克服了相位延迟算法造成的短时扰动现象,提高了检测精度,还明显加快了检测速度,实现了快速、准确地检测谐波电流。
As a high-power single-phase rectifier load, the electric traction load has a random and asymmetrical current. It is a serious interference load, which brings serious problems to the safety and economic operation of the power system and other users at its common connection point influences. By studying the existing single-phase harmonic current detection method, an improved harmonic current detection method is proposed. This method replaces the low-pass filter in the traditional method with a simple integral, delay and gain stage to reduce the detection delay to 1/6 power cycles. Instead of using the phase delay algorithm in the traditional method, the method not only overcomes The phase delay algorithm caused by short-term disturbance, improve the detection accuracy, but also significantly speed up the detection speed, to achieve a fast and accurate detection of harmonic currents.