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Reactive Power Compensation and Harmonic Mitigation in a Grid connected system using STATCOM

Vandana S Pai, Jo Joy

This paper discusses about reactive power compensation and harmonic mitigation in a grid connected system with a non-linear load by using STATCOM (Static synchronous compensator). The main objective of this paper is to show that there the harmonic distortion and the unbalance caused due to non-linear load is not affected at the grid side. Also it provides a control to maintain the dc link voltage as constant. The unbalance of dc capacitor voltage is caused due to switching loss. The control strategy used is using PI (Proportional Integral) controller and hysteresis control. This control scheme has the advantage of good stability and strong regulation capacity. The simulations are done in the MATLAB/SIMULINK. The graph shows that voltage is stabilized to a constant value also reactive power is compensated and THD (Total Harmonic Distortion analysis) is done both in the grid side and load side.