Design and Simulation of Small Signal Model of a STATCOM for Reactive Power Compensation on Variation of DC link Voltage

In general, reactive power compensation for power factor and stability of the supply system can be improved. The STATCOM (STATic synchronous Compensator) is being increasingly popular in power system applications. A small signal model of the STATCOM has been proposed without controlling DC link voltage. This scheme controls the phase angle as well as modulation index of the switching pattern. With small perturbation of reference current (reactive current of load), the DC voltage remains nearly constant. On variation of DC link voltage, the spike and overshoot of the responses have been studied and suitable DC link voltage has been selected. The values of passive parameters which have been selected are used for designing of a STATCOM. All responses are obtained trough MATLAB simulink tool box and presented here for clarity of the control strategy.