【摘要】 能否快速精确检测出谐波电流是决定有源滤波器整体滤波性能的关键。作者基于瞬时无功功率理论提出了一种改进的谐波检测算法。该算法采用变步长最小均方自适应滤波器作为检测电路中的低通滤波器,通过选择递推公式参数并结合两种误差信号的自相关估计结果调整步长进行迭代,实现了对滤波器收敛速度与稳态失调的灵活控制。理论分析和仿真实验验证了该谐波电流检测算法的正确性和有效性。更多还原

【Abstract】 Fast and precise detection of harmonic currents is the key factor that determines the integrative filtering performance of active power filter(APF).An improved harmonic detection algorithm based on the instantaneous reactive power theory is proposed,in which a new variable step length least mean square(LMS) adaptive filter is used as the low-pass filter in the detection circuit.By means of choosing the parameters of recurrence formula and the autocorrelation estimation of two error signals,the step length can be effectively adjusted,furthermore,the convergence rate and misadjustment can be controlled more flexibly.The theoretical analysis and simulation experiment prove that the proposed harmonic current detection algorithm is correct and effective.更多还原