在稳态条件下，分析了电压型PWM整流器四象限运行工作原理，得出关键在于网侧电流控制的结论。

Under steady state, the four-quadrant working principle of PWM rectifier has been explained here, the key for which has been found to be ac-side current control.

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针对以块联模型表示，且静态特性位于第一象限的饱和型非线性传感器，进行基于块联模型的动态非线性校正方法研究。

The nonlinear dynamic correcting methods based on block oriented model are researched for the sensors based on oriented model with the nonlinear static characteristic of saturation in first quadrant.

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介绍了单相电压型三电平四象限变流器工作原理。

The working principle of the single-phase voltage-source 4-quadrant converter is introduced.

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