飞轮控制系统是个多回路系统，内回路为电压稳定回路，外回路在不同的工作模式下分别为电流回路和转速回路。

Flywheel control system has two closed loops, the inner is voltage stabilization loop, other is current loop or is speed loop in different mode.

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在电路设计上，根据环路传递函数的特征，利用简单的电压模式控制和基本的PI补偿器，保证了宽带环路控制的稳定性。

According to the characteristic of the control loop, simple voltage control mode and basic PI compensation are employed to ensure the stability of the converter.

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当市电断路时，工作于电压控制模式，提供稳定的交流电源输出。

While the unity power is failed, the power conditioner works in voltage-controlled mode so as to output AC voltage.

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