Abstract
AbstractVoltage sag is the most appearing and unenviable Power Quality phenomenon in the distribution system which puts the sensitive load under risk. Voltage sags directly affect the stability of electrical networks. To diminish this phenomenon Dynamic Voltage Restorer (DVR) is implemented in distribution system. DVR uses multilevel converter for high power applications. Conventional DVR using multilevel PWM AC–AC converters undergo few drawbacks such as commutation problem and voltage balancing control issue. DVR with energy storages are bulky, costly and not able to compensate deep and longer voltage sags. This paper presents modeling and simulation of the proposed DVR system without energy storage unit and it eliminate problems undergone by conventional DVR system. Proposed system can mitigate longer voltage sags and reduce total harmonic distortions. The proposed DVR system consists of a switching cell (SC) structured cascaded multilevel PWM AC–AC converter (MPAC). The control scheme uses PI controller with PWM block to maintain the output voltage at its rated value. 1-Phase model is developed in SIMULINK for linear as well as nonlinear load. The reliability of the proposed DVR system is analyzed in MATLAB/SIMULINK for various load conditions.KeywordsPower qualityDirect PWM AC–AC converterVoltage sagDynamic voltage restorer (DVR)Switching cell (SC)
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