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利用瞬时无功功率理论（ｐｑ理论）计算谐波电流的方法广泛应用于有源电力滤波器的补偿信号检测。文中对ｄｑ变换得到的ｉｄ，ｉｑ与三相电路电流、电压的各次谐波的正、负、零序分量的关系作了分析，对ｐｑ计算谐波电流的方法及ｄｑ变换计算电流的方法作了比较，并给出了在Ｓｉｍｕｌｉｎｋ中的仿真波形。从分析和仿真结果可见，ｐｑ方法不适合于谐波电流的检测，而ｄｑ方法在电压有畸变等场合都可以很好地计算电流中的谐波分量。
The method of calculating harmonic current by using instantaneous reactive power theory (pq theory) is widely used in the compensation signal detection of active power filter. In this paper, the relationship between id and iq obtained from dq transformation and the positive, negative and zero sequence components of the harmonics of the three-phase circuit current and voltage is analyzed. The method of calculating harmonic current for pq and the method of calculating current by dq transformation A comparison is made and the simulation waveforms in Simulink are given. From the analysis and simulation results, it can be seen that the pq method is not suitable for the detection of harmonic currents, while the dq method can well calculate the harmonic components in the current when the voltage is distorted.