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An ac voltage regulating system of doubly Salient Electro-magnetic Generator has been performed in this paper. In order to maintain the high voltage 360VDC stable, the dual boost converter with fixed frequency PWM controlled is adopted. Three-phase dual buck inverter was adopted to output 115VAC/400Hz. the generating system configuration, control strategy of dual boost converter and three-phase dual...
The research on the application of the 3-phase high power PWM (Pulse Width Modulation) rectifier in the battery charge and discharge device has been a hotspot in the field of power electronics and control. As the traditional PID controller is difficult to achieve the optimum parameters, this paper proposes a new control method of PWM rectifier based on Genetic Algorithm (GA). The design of the PWM...
In power electronics efficiency improvement is constantly being sought out through venues such as improved topologies or improved devices. Series loaded resonant (SLR) DC-DC converter is a type of soft-switching topology widely known for providing improved efficiency. This paper investigates the efficiency and transient performance of SLR when a new type of diode called Super Barrier RectifierTM is...
Wind is one of the most abundant and environment friendly energy sources among renewable power sources. This paper aims to provide an efficient, reliable and cost effective model for off grid wind power solution for small industries, homes, Base transceiver station BTS and remote rural areas. Primary focus is on the design of an efficient and intelligent charge controller that utilizes maximum wind...
The converting circuit requires high performance such as the output current with high accuracy, low ripple (les0.2 %) and full-range regulated in power accumulator battery testing system for electric vehicles (EV). In this paper, a three-phase current rectifier (CSR) is taken as the main circuit. Double-loop control strategy which is base on the feedback of grid current and the output current is used,...
The free piston energy converter (FPEC) is a new type of power unit for hybrid electric vehicle. In a FPEC, an internal combustion engine driven permanent magnet linear generator (PMLG) may be utilized to produce electrical energy. A three-phase active rectifier topology together with its controller is presented for controlling the generator output. The PMLG loaded with an active rectifier is modeled...
An improved three-phase single-stage isolated power factor correction (PFC) converter topology is studied in this paper. The converter is based on full-bridge structure and operates in constant-frequency discontinuous conduction mode (DCM). Through the analysis on the working principle and mechanism of voltage spike of the original topology, a voltage-clamping circuit is proposed and added in primary...
This paper introduces a new vector control strategy of three-phase PWM rectifier. Because input currents of PWM rectifier are cross coupling in d-q coordinates, hysteresis regulators are used to achieve approximate decoupling control. Absolute error of d-q currents is considered while building d-q switching functions. Suitable space voltage vector is selected base on a switching function table. To...
This paper presents a three-level rectifier with reduced number of power switches based on one-cycle control. Only six power switches with voltage rating of half DC-link are adopted in this multilevel rectifier. A nonlinear control method, one-cycle control, is used to control the rectifier. The controller is composed of some integrators with reset, flip-flops, comparators and linear components, which...
In this paper, in order to simplify the control of indirect matrix converter (IMC) and ensure the reliability of it, the theory of finite state machine (FSM) is employed. Essentially, power electronics system consists of limited amount of states, so FSM can be introduced to the design of power electronics control system. The topology of IMC is made up of two stages: rectifier stage and inverter stage...
A novel direct power control (DPC) strategy for three-level neutral-point-clamped (NPC) pulse-width-modulation (PWM) rectifier, based on fixed synthesizing vectors, is proposed in this paper. The strategy breaks through the restrictions of vector switching with a simple switching table, improves the excellent dynamic performance of DPC, avoids the neutral-point voltage unbalance and the excessive...
The matrix rectifier described in this paper can realizes three-phase AC voltages to a DC output voltage and can work as a power factor correction converter. The paper presents an SPWM control strategy based on virtual DC link for AC/DC matrix rectifier with high frequency link. The matrix converter in the paper can be equivalent to a virtual rectifier and a virtual inverter. The proposed control...
This paper introduces the model of PWM rectifier by regarding the AC side as a virtual motor, and presents the estimation method of AC voltage, virtual flux and instantaneous active/reactive power. It is now well known that the switching table is the most important for PWM rectifier. The traditional switching table in power loop of DPC system controls instantaneous active and inactive power, leading...
To draw a sinusoidal line current and to achieve high power factor and low voltage stress of power switches, Some single-phase three-level switching mode unidirectional rectifiers with power diodes have been presented. But there is an inherited disadvantage of imbalance of the DC-link voltage, which is difficult to be solved only by control method. A novel three-level rectifier with asymmetrical legs...
This paper models the three-phase boost-type rectifier as switched linear systems (SLS) in the d-q reference frame which includes six available subsystems, so the problems of PFC and DC-bus voltage regulation are transformed to stabilizing the SLS. And then a novel control rule based on min-projection strategy is proposed, which controls the switching sequence around the six subsystems such that the...
In this paper, the high frequency mathematical model based on controlled objects of tri-phase tri-wire diode-clamped tri-level rectifier in tri-dimensional alphabetagamma coordinates has been presented. This mathematical model shows that switch function Sgamma has only effect on the voltage difference of up and down capacitor in DC side and has no effect on line current in AC side and DC output voltage...
A three-phase PWM bidirectional converter system based on line voltage oriented vector control is researched. A novel on line voltage oriented vector control without line voltage sensing is proposed. The system is operated with unit power factor in the side of AC line no matter in rectifier mode or active inverter mode. The alpha and beta components of line voltage were estimated by the line current,...
This paper proposes a novel algorithm for two-stage matrix converter to implement space vector pulse width modulation (SVPWM). Since the two-stage matrix converter has an intermediate dc link, the control process can be decoupled into rectifier stage modulation and inverter stage modulation. Conventionally, PWM algorithm for the rectifier stage is based on two larger source line voltages without zero...
This paper presents a strategy of matrix converter driving three-phase brushless DC motor (BLDCM) with trapezoidal back electromotive force. The matrix converter is described as an equivalent circuit combining virtual rectifier stage and virtual inverter stage. Input current space vector modulation and 120deg conduction mode are employed in these two stages respectively. An important part of this...
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