Study on a plug and play control method for renewable energy source

摘要

This paper proposes a new power supply module combining the solar panels with an energy storage device, which can achieve the plug-and-play function. Photovoltaic (PV) cells supply power to the micro-grid via an inverter controlled by maximum power point tracking (MPPT) strategy to extract the maximum power from the PV arrays. The energy storage system is used to maintain the voltage and frequency via an inverter governed by droop-control to maintain the stable operation of the system even under disturbances. This power supply module will have a droop characteristic when connected to a variable load. The combined module is modelled and simulated with MATLAB/SIMULINK for different working conditions, such as connecting to different load and working in the daytime or at night. The simulation results show the rationality and feasibility of the proposed module.