求翻译：在并联型有源电力滤波器中，常规结构是检测出负载电流的谐波电流信号作为参考信号来控制功率逆变电路产生补偿电流，实现谐波补偿。其中谐波电流检测也是整个有源电力滤波器系统的重点和难点。是什么意思？

In parallel active power filter, conventional structures are detected by the load current harmonic current signal as a reference signal to control the power inverter circuit generates a compensation current to achieve harmonic compensation .

The shunt-active power filters, general structure is used to detect the load current of the harmonic current signal as a reference signal to control the Power Inverter Circuit generating a compensation current and harmonic compensation. The harmonic current test is also the active power filter the f

In the parallel active electric power filter, the conventional structure is examines the load current the harmonic current signal to control the power inversion electric circuit as the reference signal to produce the bucking current, the realization overtone compensation.Harmonic current examination

In shunt active power filter in the general structure is the load current detection of harmonic current signal as a reference signal to control the power Inverter circuit current and harmonic compensation. Which is part of the active power filter harmonic currents detection the key and difficult poi

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