PWM rectifier

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

Direct Power Control System of Three Phase Boost Type PWM Rectifiers

Abstract: This paper establishs the power control mathematical model of rectifier based on the mathematical model of three phase boost type PWM rectifier in synchronous dq coordinates. According to the power control mathematical model, the paper proposes a new design method of filter inductance in AC side , voltage and capacitance in DC side of main circuit for three phase boost type PWM rectifier by combining with the features of direct power control(DPC) system. Based on the models of rectifier, the control structure of rectifier DPC system and the design method of controller is obtained. Meanwhile, the paper discusses the influence of bridge loss and equivalent series resistance(ESR) of capacitor on rectifier. The design method is proved feasible by simulation and experiment and is available for reference in engineering.

Simplified model and submodule capacitor voltage balancing of single-phase AC/AC modular multilevel converter for railway traction purpose

Abstract: A single-phase AC/AC modular multilevel converter (MMC) can interact directly with 25 kV railway grid without a bulky 50 Hz step-down transformer. This brings in great savings in size and cost. Submodule (SM) voltage balancing of this kind of MMCs remains a major technique issue. This study proposes a voltage-balancing solution for this scenario which consists of intra- and inter-arm voltage balancing methods. The former combines the advantages of carrier phase-shifted pulse-width modulation (PWM) and phase disposition PWM based voltage-balancing methods. It only uses two proportional regulators, easing the control system significantly. The latter is based on a power channel between the upper and lower arms. It avoids interferences with input/output voltage and current, and gets rid of common mode current component which would be injected into the grid with conventional inter-arm balancing methods. By assuming perfect voltage-balancing, a simplified mathematical model is also developed, which reveals more clearly the power conversion relationship. Simulations and experiments verify the proposed voltage-balancing methods and the mathematical model.

Modeling and control strategy for a single-phase PWM rectifier using a single-phase instantaneous active/reactive power theory

Abstract: This paper deals with a fast dc voltage control strategy for a single-phase PWM rectifier. The PWM rectifier must control the active and reactive powers for regulating the dc voltage. Then, in this paper, a single-phase instantaneous active/reactive power theory (the ps-qs theory) is applied to a control strategy of a single-phase PWM rectifier. In addition, the stability of a single-phase PWM rectifier is analyzed, and a novel circuit topology and control strategy using a dc active filter is proposed. Some significant characteristics on our proposal are verified by using a 100 V/1.8 kVA experimental system.

An evaluation of the DC-link capacitor heating in adjustable speed drive systems with different utility interface options

Abstract: In this paper, an evaluation of DC-link capacitor heating in adjustable speed drive systems with different utility interface options is presented. The evaluation is based on the level of ripple currents DC-link capacitors can endure that lead to self-heating and reduction of capacitors' operating life. Three popular utility interface options for ASD systems are considered for evaluation. First, a standard six-pulse diode rectifier with and without DC-link inductor is examined. Second, an active PWM rectifier, which draws nearly sinusoidal current from the utility, is studied. Third, an auto-connected 12-pulse rectifier system for utility interface is analyzed. A new term capacitor heating factor (CHF) based on the dependence of ESR on frequency is introduced and is computed for various utility interface options and the results are compared. A mathematical procedure is outlined to analytically compute the capacitor ripple current and hence heating. Simulation and experimental results are presented to verify analytical calculation. Finally, a relative comparison of capacitor heating as a function of utility interface options is presented.

Comparative evaluation of three-phase high power factor AC-DC converter concepts for application in future more electric aircrafts

Abstract: A passive 12-pulse rectifier system, a two-level, and a three-level active three-phase PWM rectifier system are analyzed for supplying the DC voltage link of a 5 kW variable speed hydraulic pump drive of an electro-hydrostatic actuator to be employed in future more electric aircrafts. Weight, volume and efficiency of the concepts are compared for an input phase voltage range of 98 V to 132 V and an input frequency range of 400 Hz to 800 Hz. The 12-pulse system shows advantages concerning volume, efficiency and complexity but is characterized by a high system weight. Accordingly, the three-level PWM rectifier is identified as most advantageous solution. Finally, a novel extension of the 12-pulse rectifier system by turn-off power semiconductors is proposed which allows a control of the output voltage and therefore eliminates the dependency on the mains and load condition which constitutes a main drawback of the passive concept.