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Mitigation of Power Quality Problems in Distribution System under Non Sinusoidal Supply Condition with UPQC using Mixed Mode Control Strategy

Dr. S Srinath

Abstract


A mixed mode control strategy for Unified Power Quality Conditioner (UPQC), which involves no transformation, is presented and demonstrated for compensating the power quality problems under non sinusoidal supply condition in a three phase distribution system. UPQC is a combination of Series Active Power Filter (SAPF) and Parallel Active Power Filter (PAPF) with a common dc link. The series compensation voltage and shunt compensation current are controlled in the present work by SPWM switching of SAPF and hysteresis control of PAPF respectively. Exhaustive simulation studies are carried out using PSCAD/EMTDC to validate the performance of UPQC with mixed mode control under non sinusoidal supply condition for compensating voltage sag, swell, unbalance in supply voltage and the effect of sudden load change. The effectiveness of mixed mode control is confirmed by comparing the results of hysteresis control applied to both APFs while mitigating the power quality problems.

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References


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