根据非线性负载的等效电路模型，提出了一种基于快速跟踪算法的有源电力滤波器单相电路谐波电流检测方法。

According to the equivalent circuit model of non-linear load, a detecting approach of harmonic current in single-phase circuit based on fast iterative algorithm in active power filter is proposed.

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因此，有必要对其直流侧等效模型进行研究，从而揭示其作为前端变流系统的负载特性。

Thereby, it is necessary to study the DC-side equivalent model of the inverters and consequently reveal the load characters relative to their front converter systems.

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