PWM rectifier

About: PWM rectifier is a research topic. Over the lifetime, 2254 publications have been published within this topic receiving 25614 citations.

High Dynamic Control a PWM Rectifier under Unbalanced Voltage Supply with Deadbeat Current Controllers

Abstract: In this paper, a control scheme of a three phase PWM boost rectifier using two parallel current deadbeat controllers is proposed. An unbalanced three-phase system produces the second order oscillation of the main frequency in DC link voltage. Two separated positive and negative sequence synchronous reference frames are applied. By using a notch filter to delete the second order harmonic on each frame, the remaining current components appear as DC parts, which are then processed by the inner control loop. Since the deadbeat digital controller has been proved itself a good solution with fast response, full digitalization, especially for applications based on Microcontroller or DSP, the inner current controllers are here implemented by deadbeat technique instead of conventional PI controllers. Simulation results with Matlab/Simulink/Plecs are also presented to demonstrate the control scheme

Research on control characteristics of PWM rectifier with RC-IGBT

Abstract: PWM rectifiers used in the vehicle power and the distributed power generation have higher requirements on the power density and the reliability. Compared with the traditional IGBT module, the reverse-conducting insulated-gate bipolar transistor (RC-IGBT) of the same package has lower thermal resistance and higher current tolerance. By using the gate of RC-IGBT to control the desaturation characteristic of the diode, the reverse recovery loss can be reduced. In the paper, an improved predictive current control method is studied to improve the output characteristics of the single-phase PWM rectifier with low switching frequency. Then through studying the desaturation control characteristics of the RC-IGBT's diode gate, we have achieved the control strategy of the gate pulse of the four switching devices of the single-phase full bridge circuit. At last, the improved predictive current control algorithm applied to the PWM rectifier of RC-IGBT based on the desaturation characteristic of the diode has been simulated, and tested on a small power platform. The results prove that the desaturation control of the improved predictive current control algorithm can effectively control RC-IGBT and realize the stable output of the PWM rectifier.

Control of three-phase PWM rectifier under unbalanced input voltage conditions without sequential component extraction

Abstract: Many methods for control of three-phase boost-type PWM rectifier under unbalanced input voltage conditions have been presented in the last two decades. Among these methods, the input-output-power-control (IOPC) method seems the most desirable one offering ripple-free dc bus voltage, low-distortion input currents and average unity power factor on the grid side. Most of the IOPC schemes adopt rotating frame and sequential component extraction of the input voltages, rectifier pole voltages and/or input currents are almost unavoidable. Anyway, this paper presents a novel IOPC method which can regulate the instantaneous active/reactive powers in stationary frame. Compared with the conventional methods, the most important advantage of the proposed algorithm is the complete elimination of the sequential component extraction, which means much reduced time delay can be expected in the control system. Meanwhile, grid voltage phase detection and rotating transformation are also nullified. Experimental results on a 30 kVA PWM rectifier prototype show validity of the proposed method.

A soft switching three-phase three-switch buck rectifier

Abstract: In this paper a novel soft switching three-phase pulse width modulation (PWM) rectifier is proposed. Various switching state sequences of a three-phase three-switch bucktype unity power factor rectifier are reviewed and the operation modes of the converter are explained and analyzed. The converter operates under zero current switching (ZCS) condition. By using an auxiliary circuit with a simple method of energy recovery, the current is diverted away from the main power switches before they are to be turned off; so, switching losses in the converter are reduced. The auxiliary circuit consists of two auxiliary switches and a resonant inductance-capacitance circuit connected to the auxiliary switches. The proper operation of the converter is confirmed by the results obtained from the digital simulations.

Research on the Novel Charge-discharge System of Storage Battery

Abstract: At present, the issue of low power factor and harmonic pollution in traditional charge-discharge system is serious, with the development of PWM rectifier technology, A novel main circuit topology of charge-discharge system with a three-phase voltage source PWM rectifier (VSR) and Bi-directional DC-DC converter are applied in this paper. It can be used as battery charging power supply, but also as a discharge load of battery. Regenerative energy is feedback to power grid and the purpose of energy-saving and environmental protection are attained. A charge-discharge simulation model based on constant-current-constant-voltage (CC-CV) charge/ constant-current discharge is established. Simulation results show compared with the traditional charge-discharge system, the novel charge-discharge system can achieve sinusoidal input currents and has lower harmonic pollution, and at the same time complete discharge process of energy to feedback to power gird.