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A 4-ary Control Algorithm for Direct Power Control of Three Phase Pulse Width Modulated Rectifier
Objectives: The Direct Power Control (DPC) strategy for front end Pulse Width Modulated (PWM) rectifier employing binary hysteresis controller with two digital outputs and a new 4-ary control algorithm with four digital outputs is investigated. Methods/Analysis: The prototype DPC-PWM rectifier based on conventional binary algorithm and proposed 4-ary control algorithm for hysteresis controllers is designed and modeling and simulation was performed in MATLAB/ SIMILINK® environment. The total harmonic distortion of supply current and average switching frequency under steady state are measured for a load of wide dynamic range for different hysteresis widths. The DC output voltage ripples and power ripples are also observed. Findings: It was found that the total harmonic distortion in supply current was reduced and remained bounded within narrow range in 4-ary control as compared to binary control. The average switching frequency also remained bounded within narrow range in proposed control as compared to conventional hysteresis control. The DC output voltage ripples and power ripples were found to be reduced considerably at heavy loads as compared to binary control. Novelty/Improvement: The tight control of active and reactive powers not only around the hysteresis band but also within the hysteresis band is achieved with simple algorithm.
Direct Power Control, DPC, 4-ary Algorithm, Front End Rectifier, Improved DPC, Pulse Width Modulated Rectifier.
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