PWM rectifier

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

Study on the Sensorless Current Control Strategy of Three-Phase Voltage-Source AC/DC PWM Rectifier

Abstract: Three-phase AC/DC PWM rectifier can improve power factor and decrease harmonic contami-nation.Bi-directional power flow is realized when this rectifier is used at the commutating side of an in-verter.The rectifier can be controlled by direct and indirect current control schemes.The former requires at least two current sensors with high capability.The latter is put forward to use current observer,which is cost-effective by improving the dynamic response compared with the phase and amplitude control in indirect scheme and eliminating the expensive current sensors.The current observer estimates the current by detect-ing phase voltage,DC output voltage of the rectifier and three-phase switch functions.Yet it is crucial to detect switch functions and estimate input currents.Its mathematical model is acquired by theoretical analysis and simplified expressions of currents observer are deduced under certain hypothesis.The value of the cur-rent observer is acquired by digital simulation in Matlab and compared with the actual current wave con-trolled by direct current control scheme.The experimental results are verified on power system PE-PRO.

A high-efficiency soft switching zero-voltage-transition converter using combined inductor energy recovery circuits

Abstract: This paper presents a novel single-phase high power factor soft switching PWM rectifier, featuring soft commutation of the main and auxiliary switches using a simplified combined inductor energy recovery circuit. Conventional soft switching PFC circuits require both a boost inductor and an additional transformer separately to achieve soft switching and energy recovery. In this paper, these two devices are combined together as one unit. The combined inductor with simple additional winding can work as a boost inductor and an auxiliary inductor at the same time. The input current shaping is achieved with average current mode, and continuous inductor current mode control. Principle of operation, theoretical analysis, a design example and experimental results from a laboratory prototype rated 2 kW with 400 VDC output voltage are presented. The measured efficiency and power factor were 97.63% and 0.998 respectively with an input current THD less than 2.5%. Thus the proposed topology can reduce the number of devices in the circuits while achieving high efficiency.

Control of a single-switch three-phase rectifier operating in continuous conduction mode

Abstract: In many power electronics power supplies, power converters connected to the network are diodes or thyristors bridges, which cause a great deal of harmonic currents. The increasing number of power converters used today may lead to high harmonic levels on the network, which is deemed a potential problem for electricity supply quality and the proper operation of electrical equipment. This explains the appearance of standards aimed at reducing the harmonic emission of power supplies. In terms of the three-phase power converters which are typical of medium- and high-power applications, the PWM rectifier is a well-known and efficient way of obtaining a good power factor. It is expensive, however, and the challenge is now to find more economical devices which would help the spread of such nonpolluting power converters. In response, this paper thus describes a single-switch, three-phase PWM rectifier. This power converter operates in continuous conduction mode in order to avoid the voltage or current overloads which are inherent to discontinuous conduction mode operation.

Application of LCL-filter in three-phase PWM rectifier

Abstract: LCL-filter is used in three-phase PWM(Pulse Width Modulation)rectifier instead of traditional L-filter to attenuate high frequency harmonics.A new method is provided to simplify the parameter design of LCL.The converter-side inductor,AC capacitor and grid-side inductor are calculated based on the maximum allowable current ripple at converter side,the maximum reactive power to be absorbed and the maximum allowable current ripple at grid side respectively. An accurate simulation model is established with the consideration of the time delay induced by controllers and the system stability is analyzed in z-plane to optimize the damping resistor.An example is given.Comparison of PWM rectifiers between L-filter and LCL-filter are carried out by experiments,showing the advantages of the latter.Experimental results validate the correctness of proposed methods for parameter design and stability analysis.