Nonlinear modeling and control of a photovoltaic fed improved hybrid DSTATCOM for power quality improvement

• We model a low rating PV fed improved hybrid DSTATCOM for power quality improvement.
• Load active power demand with reduced power rating of PV is satisfied.
• For modeling and control, non-linearity of the system is considered.
• Switching pulses for inverter is generated using sliding mode controller.
• Real time implementation of proposed system has been carried out.

This paper proposes a low rating photovoltaic fed improved hybrid distributed static compensator (DSTATCOM) for the compensation of harmonics and reactive power. The proposed system satisfies the load active power demand with reduced power rating of the photovoltaic source for same load rating as compared to the standard L or LCL filters. The system is modeled and controlled by considering the non-linearity of the system. A dc voltage droop regulator is used to control the power flow from solar system and to maintain dc link voltage. To make the system robust, switching pulses for inverter is generated using sliding mode controller. The efficacy of proposed model with sliding mode controller over linearly controlled system is validated through simulation results. The proposed system prototype is developed and operated in real time to show the effectiveness of the system.