PWM整流器具有功率因数高、能量可双向流动、直流电压恒定等优点。
PWM rectifiers have the characteristics of large power factor, bidirectional power flow and constant direct voltage.
三相电压型PWM整流器具有输出电压恒定、能实现单位功率因数运行的特点，甚至可以实现电能回馈电网。
The three-phase PWM voltage source rectifier presented in this paper owns such features as constant output voltage, running under unit power factor and feedback of the power into the power networks.
系统通过瞬时无功功率闭环，实现了功率因数的恒定控制和无功功率的无静差调节。
The closed loop control of instantaneous reactive power is used to realize the constant power factor and suppresses the reactive power impact.
系统通过瞬时无功功率闭环，实现了功率因数的恒定控制和无功功率的无静差调节。
The closed loop control of instantaneous reactive power is used to realize the constant power factor and suppresses the reactive power impact.
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