Topic
PWM rectifier
About: PWM rectifier is a research topic. Over the lifetime, 2254 publications have been published within this topic receiving 25614 citations.
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TL;DR: In this paper, a variable switching frequency PWM (VSFPWM) strategy was proposed for dc-link voltage ripple control in two-level rectifier. But, the voltage ripple is determined by the DC-link current directly, and can be predicted synchronously with PWM signals.
Abstract: The switching frequency is an important control parameter of pulse-width-modulation (PWM) rectifier to reduce switching losses and electromagnetic interference noise. This paper proposed a variable switching frequency PWM (VSFPWM) strategy for dc-link voltage ripple control in two-level rectifier. DC-link voltage ripple is determined by the dc-link current directly, and can be predicted synchronously with PWM signals. A real-time prediction model of dc-link voltage ripple is derived for a common voltage-oriented control PWM rectifier. Then, VSFPWM control is introduced, which changes the switching frequency cycle to cycle with a restriction of dc-link voltage ripple peak value. Furthermore, the dynamic behavior is also observed when the proposed VSFPWM control scheme is adopted. Detail simulation and experimental comparisons are carried out between VSFPWM and normal constant switching frequency PWM, which demonstrate the advantages of the proposed method.
21 citations
18 Jun 2006
TL;DR: In this article, a comparative simulation study between three different approaches applied to harmonic mitigation in permanent magnet synchronous generators (PMSG applied to wind energy conversion system (WECS) using variable speed operation is presented.
Abstract: Permanent magnet synchronous generators (PMSG applied to wind energy conversion system (WECS) using variable speed operation is being used more frequently i wind turbine application. Variable speed systems have several advantages over the traditional method of operating win turbines, such as the reduction of mechanical stress and a increase in energy capture. To allow the variable speed operation of the PMSG WECS a conventional three-phase bridge rectifier (BR) with a bulky capacitor associated with voltage source current controlled inverter (VS-CCI) is used This simple scheme introduces a high intensity low frequency current harmonic content into the PMSG and consequently increases the total loses in it. Subsequently, decreases the power capability of the system. This paper presents comparative simulation study between three different approaches applied to harmonic mitigation in PMSG WECS The studied techniques are: a) harmonic trap filters (HTF), b single-switch three-phase boost rectifier (PFC) and c) a three phase boost type PWM rectifier (PWMREC).
20 citations
24 Oct 2005
TL;DR: The modeling and control of a three-phase, three-switch buck-type rectifier system with integrated boost output stage (VRX-4) is analyzed and the stability of the closed loop system is discussed and the robust operation of the system is verified by measurements on a 5 kW prototype.
Abstract: The modeling and control of a three-phase, three-switch buck-type rectifier system with integrated boost output stage (VRX-4) is analyzed in this paper. A cascaded multi-loop control structure is presented that has the following features: constant output voltage for a wide input voltage range and step-wise changes of load; sinusoidal input currents in phase with the mains voltages that also remain sinusoidal in case of asymmetric mains conditions; and active damping of the input filter resonance. For the control design an equivalent DC-DC small-signal model of the converter is derived and verified by simulations and measurements. Based on this and the identification of the critical operating point the controllers for the inner DC current and outer voltage control loops are selected The stability of the closed loop system is discussed and the robust operation of the system is verified by measurements on a 5 kW prototype.
20 citations
23 Jun 1996
TL;DR: In this article, a quasi-single-stage isolated three-phase zero-voltage/zero-current-switched (ZVZCS) buck PWM rectifier for high-power off-line applications is proposed.
Abstract: A new quasi-single-stage isolated three-phase zero-voltage/zero-current-switched (ZVZCS) buck PWM rectifier for high-power off-line applications is proposed. It consists of a three-phase buck bridge switching under zero-current and a phase-shift-controlled full-bridge with ZVZCS, while no intermediate DC-link is involved. Input power and displacement factor control, input current shaping, tight output voltage regulation, high-frequency transformer isolation, and soft-switching for all the power devices are realized in a unified single stage. A 6 kW, 50 kHz prototype for telecommunication applications has been developed and preliminary tests for the prototype validates the operation of the proposed rectifier. Simple control, high efficiency and fast dynamics are among its salient features.
20 citations
26 Dec 2007
TL;DR: The rectifier in this paper employs the leakage reactance of the secondary windings of the input transformer instead of physical reactor because of the large number of reactors needed by the PWM rectifiers in a cascaded H-bridge multilevel converter.
Abstract: This paper proposes to use PWM rectifier to replace the diode rectifier in the cascaded H-bridge multilevel converter in order to regenerate the power from the load to the grid. The rectifier in this paper employs the leakage reactance of the secondary windings of the input transformer instead of physical reactor because of the large number of the reactors needed by the PWM rectifier in a cascaded H-bridge multilevel converter. Voltage oriented control (VOC) is used to obtain the good performance of the control system.
20 citations