A driving unit is connected to the first substrate and outputs a common voltage.

驱动单元连接到第一基板，并输出公共电压。

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Each module is controlled by voltage current two closed loops. The common voltage loop controls system output voltage & frequency, and generates a common reference current signal.

三台航空静止变流器模块均为电压、电流双环控制，通过公用电压调节器稳定并联系统的输出电压及频率，同时产生统一的模块电流给定信号。

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Each module is controlled by voltage-current two closed-loops. The common voltage loop controls system output voltage & frequency, and generates a common reference current signal.

每台航空静止变流器模块均为电压、电流双环控制，通过公用电压调节器稳定并联系统的输出电压及频率，同时产生统一的模块电流给定信号。

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Higher-voltage transmission lines that have become more common in recent years are intrinsically more susceptible to upset, and those lines are largely concentrated in the manufacturing centers of the Midwest.

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