【作者】 何益宏； 卓放； 李红雨； 王兆安；

【机构】 西安交通大学电气工程学院；

【摘要】 本文以瞬时无功功率理论为基础,对影响谐波电流检测精度的因素进行了分析,指出用低通滤波器检测直流分量是影响谐波电流检测精度的主要原因。提出一种新型的数字化谐波电流的实时检测方法,用复化积分提高直流分量的检测精度,用Hamming窗消除直流分量检测过程产生的频谱泄漏。该方法不仅能实时提供有源电力滤波器所需的电流补偿指令信号,还能以较高的精度检测基波和各次谐波电流的正序及负序分量。仿真结果证明了该方法的正确性,并已在研制的30kVA有源电力滤波器中得到了成功的应用。更多还原

【Abstract】 This paper propose a new digital real-time method, which can improve precision by using complex integral arithmetic and reduce the spectrum leakage by using the Hamming window, to detect the harmonic current. This method not only can offer the current command signal to APF, but also can detect the positive phase-sequence and negative phase-sequence content of the fundamental and harmonic current. The result of simulation has proved it. And the method has been used in 30kVA APF. Furthermore, based on the instantaneous reactive power theory, this paper analyze the factors which depress the detect precision of the harmonic current, and show that the main reason is the use of low-pass filter.更多还原