Modelling and Control of a Small-Scale Distributed Generation System based on Wind-PV and Battery

The paper presents modelling and control of an autonomous distributed generation system comprises of direct-drive permanent magnet synchronous generator (PMSG) based wind turbine, solar photovoltaic (PV) array and battery. The main objective of the present work is to achieve maximum power point tracking (MPPT) operation of both wind turbine and solar PV array along with delivery of quality power to the end user. A battery bank is connected across DC link through bidirectional boost converter and controlled to maintain the DC link voltage constant by charging/discharging under the events of surplus/deficit generation. Incremental conductance (INC) and tip-speed-ratio (TSR) algorithms of MPPT are used for harnessing maximum power from both the renewable energy sources. The load side inverter is controlled in order to provide a voltage of constant magnitude and frequency to the end user. The proposed system is modelled in MATLAB/Simulink and performance of the system is analysed under changes in wind speed, solar irradiance, and load demand. Controller Performance are found satisfactory in both transient as well as steady state in addition MPPT operation of both wind turbine and PV array is achieved.