基于一种新型正弦幅值积分器的谐波检测方法

针对基于瞬时无功理论的ip-iq谐波检测法结构复杂、响应速度慢等问题，提出了一种采用改进正弦幅值积分器结构的谐波电流检测方法。首先，利用二阶广义积分器的输出滤波特性及正弦幅值积分器的极性选择特性，使其相结合构造出了一种滤波性能更强，同时具有频率及极性选择作用的新型积分器。然后，利用该积分器快速准确地提取基波正序分量，并有效应用于谐波检测环节中。当电网电压存在直流偏置问题时，该积分器所构造的锁相环也能准确锁定电网频率及相位信息。最后，理论分析及仿真实验结果表明：该方法无需进行瞬时对称分量分离，就可提取出电网电压及负载电流基波的正负序分量，计算量小，谐波检测更精确。

Harmonic detection method based on a new sinusoidal amplitude integrator

There are problems of complex structure and slow response of the ip-iq harmonic detection method based on instantaneous reactive power theory. Thus a harmonic current detection method based on an improved sinusoidal amplitude integrator is proposed. First, the method uses the output filtering characteristics of the second-order generalized integrator and the polarity selection characteristics of the sinusoidal amplitude integrator to construct a new integrator with stronger filtering performance and frequency and polarity selection. Then, the integrator is used to quickly and accurately extract the fundamental positive sequence component, and is also effectively applied to harmonic detection. When the grid voltage has DC bias problems, the phase-locked loop constructed by the integrator can also accurately lock the grid frequency and phase information. Finally, the theoretical analysis and simulation experimental results show that this method can extract the positive and negative sequence components of power grid voltage and load current without instantaneous symmetric component separation. The calculation is short and the harmonic detection is more accurate