SIMULATION AND HARDWARE IMPLEMENTATION OF UPQC FOR POWER QUALITY IMPROVEMENT IN SECONDARY DISTRIBUTION SYSTEM
P VENKATESH KUMAR R.Rajeswari
Power quality is a prime issue in electrical distribution side. To alleviate the Power Quality problems, Unified Power Quality Conditioner (UPQC) is preferred. A UPQC that combines the feature of series and shunt active power filter, which are used at the Point of Common Coupling (PCC) for improving the power quality, is simulated using SRF control strategy. The synchronous reference frame (SRF) theory is used to obtain the reference signals for series and shunt active power filters (APFs). The UPQC is realized using two voltage source inverters (VSI) connected back to back, to a common dc link capacitor. For mitigation of voltage sag, voltage and current harmonics, a UPQC with robust control has been presented in this paper. The used technique is simulated using MATLAB/SIMULINK 7.8. The algorithm is validated by using a prototype of microcontroller (PIC18F877) based UPQC. Detailed experimental results are presented
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