Performance analysis of unified power quality conditioner under different power quality issues using d-q based control
Utility has to supply quality power to all consumers. Electrical equipment like compressors and pumps take heavy inrush of current during starting, causing voltage sag/swell. On the other hand, usage of Electric Drives and Switch Mode Power Supplies generate harmonics in the supply system. In this paper, Synchronous Reference Frame control applied to Unified Power Quality Conditioner is presented to regulate the load voltage and supply currents against supply voltage distortion, voltage sag/swell under non-linear and unbalanced loads. Using Matlab/Simulink, a three-phase four wire system under distorted voltage supply, voltage sag/swell and unbalanced non-linear load was developed. Active and reactive power flow analysis is also investigated in this study. Capacitor voltage balancing is maintained using PI controller. Simulation results prove that under unbalanced and nonlinear load conditions, UPQC effectively eliminates harmonics, compensates voltage problems like voltage sag/swell and improve power factor at supply.
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