PWM rectifier

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

Power Quality Improvement Using Hybrid Passive Filter Configuration for Wind Energy Systems

Abstract: Wind energy conversion systems (WECS) which consist of wind turbines with permanent magnet synchronous generator (PMSG) and full-power converters have become widespread in the field of renewable power systems. Generally, conventional diode bridge rectifiers have used to obtain a constant DC bus voltage from output of PMSG based wind generator. In recent years, together advanced power electronics technology, Pulse Width Modulation (PWM) rectifiers have used in WECS. PWM rectifiers are used in many applications thanks to their characteristics such as high power factor and low harmonic distortion. In general, L, LC and LCL-type filter configurations are used in these rectifiers. These filter configurations are not exactly compensate current and voltage harmonics. This study proposes a hybrid passive filter configuration for PWM rectifiers instead of existing filters. The performance of hybrid passive filter was tested via MATLAB/Simulink environment under various operational conditions and was compared with LCL filter structure. In addition, neuro-fuzzy controller (NFC) was preferred to increase the performance of PWM rectifier in DC bus voltage control against disturbances because of its robust and nonlinear structure. The study demonstrates that the hybrid passive filter configuration proposed in this study successfully compensates current and voltage harmonics, and improves total harmonic distortion and true power factor.

Suppression of common-mode voltage in a PWM rectifier/inverter system

Abstract: This paper proposes a PWM rectifier/inverter system capable of suppressing not only supply harmonic currents but also electromagnetic interference (EMI) An active common-noise canceler (ACC) developed for this system is characterized by sophisticated connection of a common-mode transformer which can compensate for common-mode voltages produced by both PWM rectifier and inverter As a result, the size of the common-mode transformer can be reduced to 1/3, compared with the previously proposed ACC A prototype PWM rectifier/inverter system (22 kW) has been implemented and tested Some experimental results show reduction characteristics of the supply harmonic current and EMI

Multilevel three-phase rectifier with sinusoidal input currents

Abstract: A multilevel three-phase PWM rectifier absorbing sinusoidal and in phase mains currents is proposed in this paper. The article deals with this new structure, its control and the way to balance the voltage of the output capacitors in order to optimize its characteristics without disturbing the current waveform.

A three-phase current-source type PWM rectifier with feed-forward compensation of input displacement factor

Abstract: Three-phase current-source type PWM rectifiers are often used as the front-end power converter unit in utility-interfaced systems. Due to the input filter (needed for current harmonic suppression), the input displacement factor is less than unity. It varies with the rectifier operating point and may result in unacceptable low values. In this paper, a new control method is proposed to achieve unity displacement factor independent of the load conditions. The proposed method controls the phase shift of the input currents in a feedforward fashion. The modulating signals are phase shifted according to the rectifier operating point to always result in near unity input displacement factor. The compensation scheme makes use of a DC current loop and the standard DC voltage regulation loop to produce the modulating signals with the required phase shift. As a result, the control circuitry does not require additional sensors. The PWM pattern is generated online, which results in fast response to transients. The rectifier is analyzed and design equations are derived. A design example is given and theoretical considerations are verified through simulation and by experimental results obtained on a 1 kVA laboratory prototype. >

Modular energy feedback type traction power set and control method

Abstract: The invention relates to a modularized energy feedback traction power supply device and a control method thereof, wherein, the device comprises a multi-winding transformer, a plurality of PWM rectifier units and a central controller, wherein, the multi-winding transformer is provided with a primary winding and a plurality of secondary windings, and all of the secondary windings have the same connecting mode; each secondary winding of the transformer is connected with a PWM rectifier unit; the direct-current outputs of all the PWM rectifier units are connected to a direct-current bus of the general power supply device in serials. Double closed-loop control of voltage and current is adopted; an outer loop of direct-current voltage is arranged on the central controller and an inner loop based on synchronous rotating frame is arranged on each PWM rectifier unit. The power supply device is remarkably characterized by easy modularization, large capacity, bipolar energy transmission, high power factor, small current harmonic wave and stable direct-current voltage.