Realization of a Single Stage Control Strategy for Three-Phase Grid-Connected Photovoltaic System with Linear and Non-Linear Loads

摘要

This paper realizes the design of three phase grid connected photovoltaic system with a single stage inverter control strategy for obtaining the maximum power point tracking. The control strategy is adopted based on p-q theory for better utilization of grid connected photovoltaic system with linear & nonlinear loads. Based on this theory, during day time PV system compensates active power (completely/partially) and the reactive power required by the load. When the irradiance is weak (during night time), the PV system compensates the reactive power required by the load, and the active power is supplied by grid. The significance of the presented control strategy is that the photovoltaic system can be operated throughout the day. Further, harmonic compensation is also supplied to mitigate the harmonics in order to enhance the power quality issues at grid side. Finally, the single stage control strategy is demonstrated on three phase grid connected system with linear balanced, linear unbalanced and non-linear loads and thus obtained simulation results are validated the effectiveness of the control strategy for effectively minimizing the total harmonic distortion and greater reduction of harmonic content.