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.
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。
2
Consisting of a rectifier, charger, battery bank, inverter, monitor and other devices, UPS can offer the energy storage with constantvoltage and frequency power source for the electrical load.