【摘要】 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数进行了分析 ,得出低通滤波器是影响计算精度的主要原因之一。在此基础上 ,提出一种数字化的实时检测新算法 ,用复化积分提高检测直流分量的计算精度 ,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有效值。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 proposes a new digital real time method which is a modified method for harmonic current detection based on instantaneous reactive power theory With complex integral algorithm and employing Hamming window function to suppress spectrum leakage,the measurement accuracy can be improved It can be used to measure not only the total harmonic current,but also the positive sequence and negative sequence components of each harmonics The validity of the method is verified by computer simulation It is also verified in the applications to a 30kVA active filter experimental prototype更多还原