PWM rectifier

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

A 100 kW high-performance PWM rectifier with a ZCT soft-switching technique

Abstract: This paper presents a 100 kW three-phase pulse-width modulated (PWM) boost rectifier that serves as the front-end power source for a DC distributed power system. A zero current transition (ZCT) soft-switching technique is applied to achieve greater performance in this high-power converter. This ZCT soft-switching technique assists the turn-on as well as the turn-off of the main and auxiliary insulated gate bipolar transistor (IGBT) switches. An issue about the implementation of the ZCT soft-switching technique in three-phase applications is discussed. A space vector modulation (SVM) scheme suitable for high power applications with high performance is identified. Experimental results demonstrate that high performance is achieved, in terms of wide control bandwidth, low total harmonic distortion (THD), unity power factor and high efficiency.

Direct power control for Neutral-point-clamped three-level PWM rectifier

Abstract: This paper proposes a direct power control (DPC) strategy employed for the neutral-point-clamped (NPC) three-level PWM rectifier. Mathematic model of NPC three-level rectifier is conducted firstly as a theoretical base. This topology generates a higher number of output voltage levels, increasing the flexibility for selecting an appropriate voltage vector. The direct instantaneous power control technique for the converter, which has been developed to control the instantaneous active and reactive power directly by selecting the optimum switching state of the converter, is discussed in detail in the paper. The neutral-point potential is controlled according to the direction of the mid-point current and a study of each switching vectorpsilas influence to active and reactive power. Theoretical analysis is presented and the performance of the proposed method is verified by simulation and experiment.

An Analytical Modelling of Three-Phase Four-Switch PWM Rectifier Under Unbalanced Supply Conditions

Abstract: A new description of the three-phase four-switch converter aimed at compensating reactive power in the general case of unbalanced source voltages is proposed. A mixed p-z approach based on integral transformations (the Laplace and modified Z-transform) is suggested for obtaining solution in a closed form. The analytical procedure is verified by experimental results to confirm the effectiveness of the proposed control scheme.

A three-phase three-switch two-level PWM rectifier

Abstract: This paper presents a new topology for a high power factor three-phase PWM rectifier system, without a neutral wire, with output voltage control and high efficiency The control is simple and was implemented using commercial single phase modulators with independent current loops and a voltage loop The power circuit is also very simple, permitting the use of low cost power devices A mathematical analysis for the converter is presented, including the determination of all the power devices, the current and voltage transfer functions and a project procedure Finally, results obtained through digital simulations and the experimental results obtained from a 6 kW prototype are presented

Modular PM generator/converter topologies, suitable for utility interface of wind/micro turbine and flywheel type electromechanical energy conversion systems

Abstract: In this paper, modular PM generator and converter topologies, suitable for the utility interface of wind turbine, micro turbine and flywheel type electromechanical energy conversion systems are explored. It is shown that winding connections of the standard PM generator in the above applications can be reconnected into several single-phase and three-phase groups, each powering a separate PWM rectifier, resulting in high performance electromechanical energy conversion systems. The proposed approaches are fault tolerant and can continue to function at reduced power levels under faults. An example 3-phase, 10 hp, 4 pole, 60 Hz, 230 V/460 V PM motor/generator winding connection diagram along with the associated converter configurations is fully analyzed for the above listed applications.