Abstract
The paper describes and implements a stand-alone! unity power factor, controllable current source converter system. It is based on high frequency PWM technique. The converter topology is chosen to operate for both inverter and rectifier modes. Firstly, the principle of operation is discussed. Then. the presented AC-DC converter that demands only sinusoidal active current is studied Most features of the converter are dearly interpreted for resistive and dynamic loads. On the basis of the given analysis, the paper provides PWM converter design guidelines for unity power factor operation. Also, a novel control strategy is proposed, which .allows to fulfill all the specifications; in particular zero reactive power demand and very low distorted line currents have been guaranteed. The proposed method in this paper utilizes simultaneously the control variables: modulation index D (variab1e PWM pattern) and power angle 8 (position of the PWM pattern). The instantaneous control for both achieves high--dynamic response and insensitiveness to parameter variations and disturbances. Also, the presented control structure employs power factor adjustment capability. This development provides a low cost solution, where no digital signal processors or large memories for the PWM generation are required. Results from device Lwei PSPlCE confirm the validity of the proposed method and the performed analysis. The proposed system can be utilized for power conditioning, DC and AC drive applications.
Highlights
The proposed system can be utilized for power conditioning, DC and AC drive applications
Traditional power electronic systems are the main reason for harmonic pollution
The line cum:nts drawn by such ClntVerteIS have distorted waves those posses harmonic and reac2ive power
Summary
Traditional power electronic systems are the main reason for harmonic pollution. This pollution may lead to destructive resonance beside rrwty other drawbacks for the electrical distribution systems. For example inpw:filters are used to reduce input harmonics, a compensating system can be used for power factor improvement Another approaches ~ an additional power electronic schemes such as active filters [1]-[S] and reactive power compensators {6]-{8) that adapt itself with the AC-DC converters to overcome its drawbacks. The recent developed approach uses PWM tcchnique for rectifier schemes It can offer several advanced features such as sinusoidal input CWTent at unity power factor and simultaneous high quality DC output This in tum results in reduced current ripple and reduced AC voltage distortion in Mansoura Engineering Journal, Vol 20, No :l June 1995. Fin.aIly, the real control method and power circuit haw been implemented using Pspice for verification
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