A Multilevel Voltage Waveform Generation Scheme with Reactive Power Compensation for PV Systems

A scheme for generation of multilevel voltage waveform with reactive power compensation for standalone PV system is proposed in this paper. The proposed scheme is realized using two two-level, three-phase voltage source inverters feeding a transformer with open-end primary windings. In this scheme one inverter is fed by a PV source intended only for supplying active power whereas and the other inverter which supplies only reactive power is fed by a charged capacitor. The current oriented synchronous reference frame based closed loop control scheme ensures that the active power is supplied from one inverter and the reactive power from the other. The entire scheme is simulated on a MATLAB/Simulink platform. The experimental verification of the control scheme is carried out on a laboratory prototype using TMS320F28335 Digital Signal Processor.