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In this paper, a new unidirectional three-level rectifier is presented to draw sinusoidal line current with low THD and unity power factor. The adopted rectifier consists of a diode bridge, a power switch and two blocking diodes. Low cost, simple structure and convenient control are the main advantages of this rectifier. A two loop controller is developed to control the adopted rectifier. A voltage...
In this paper, a new control scheme is proposed for the new single-phase single-switch three-level rectifier to supply two different load with different voltages and draw sinusoidal line current with low THD. The adopted rectifier consists of a diode bridge, a power switch and two blocking diodes. Low cost, simple structure and convenient control and three level voltage are the main advantages of...
In this paper, according to the control requirement and actual project conditions of three-phase high power factor rectifier, the research of low switching losses three-phase PWM rectifier adopts hysteresis current control strategy which bases on load current feed-forward control. The system not only improves the high-frequency switching problem, but also makes that the system has much lower dependence...
This paper presents a direct torque control (DTC) applied to a three-phase asynchronous motor supplied by three-phase rectifier with absorption of the sinusoidal current cascaded with a two levels inverter in order to improve certain electrical sizes as the source current, and other mechanical characteristics as the undulations of the torque and the flux's distortion. The speed control is realised...
According to high power factor and the actual project needs which are requirements of three-phase rectifier control as known, the research of three-phase PWM rectifier is based on the current vector control. The system still adopts hysteresis current control strategy. This system not only truly reflect the operational status of PWM rectifier, but also make the design of control system easier, and...
PWM rectifier control system is designed, where predictive current control in two static reference frames is as current control method, voltage space vector pulse width modulation is pulse width modulation method, and traditional PI regulator is adopted as DC voltage control. This method has an advantage of quick response of hysteresis current control, the frequency of apparatus is fixed, and control...
There are two control objectives in active rectifiers: DC regulation and power factor correction, however it is difficult to reach both objectives simultaneously. In this paper is presented the use of an observer based control for complete both control objectives. A proporcional integral (PI) control is applied to regulate DC voltage and a hysteresis based control for improve the power factor. Experimental...
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