Harmonic current detection is a key algorithms for shunt active power filter controller, which generates reference currents to compensate the harmonics of grid current. This paper presents a new harmonics detection method based on the triangle orthogonal principle algorithm. Compared to the conventional harmonic current detection methods, the presented method has the advantages of simple structure, low calculation, and fast execution time. Using the phase signal detected by the phase-locked loop synchronized with the power grid signal, the method based on the triangle orthogonal principle can provide a simple method to detect the reference current. At the same time, because the method proposed in this paper has lower implementation complexity and less microcontroller resource consumption, low-cost microcontrollers can be used to implement the proposed method, which has practical engineering value. Finally, this paper analysis the proposed method in detailly and verifies its great performance through experimental results.

谐波电流检测是并联有源电力滤波器控制器的关键算法，它产生参考电流来补偿电网电流的谐波。本文提出了一种基于三角正交原理算法的谐波检测新方法。与传统的谐波电流检测方法相比，该方法具有结构简单、计算量少、执行速度快等优点。利用锁相环检测到的与电网信号同步的相位信号，基于三角正交原理的方法可以提供一种简单的检测参考电流的方法。同时，由于本文提出的方法具有较低的实现复杂度和较少的单片机资源消耗，可以使用低成本的微控制器来实现所提出的方法，具有实用的工程价值。最后，本文详细分析了所提出的方法，并通过实验结果验证了其出色的性能。