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This paper deals with the design and implementation of a multi level based STATCOM to maintain voltage stability by compensating the reactive power in the power system. The static synchronous compensator (STATCOM) is the primary shunt connected Flexible AC Transmission System device, in which the power electronic devices are used to control power flow and to improve transient stability on power grids. The control of reactive power is performed by means of a cascaded nine level H-Bridge inverter. This multi level inverter uses forced commutated power electronic devices (GTOs) to synthesize a voltage from a DC voltage source. The control strategy used to control the output of voltage source converter is sinusoidal pulse width modulation technique in which specified harmonic elimination (SHEM) is possible. This paper presents an investigation of transient modulation-index controller and steady-state Modulation-index regulator for good dynamic response in the transient period and to ensure minimal harmonics at steady state.

Cascaded Nine Level H-Bridge Inverter Control of STATCOM for Compensation of Reactive Power and Voltage Stability Enhancement