Energy Control Research Of Photovoltaic Power Generation System For Dynamic Stability Characteristies Of Micro-grid

At present, microgrid has gradually become the trend of distributed energy applications. View of uncontrollable output of PV generation system in microgrid, this paper put forward use of long and short-term energy management to control output of PV arrays. Daily output reference of PV generation system is the control objective of long-term management. Short-term energy management adjusts the fluctuations caused by load changes or unpredictable output of PV arrays. Hybrid batteries and super-capacitors energy storage systems are used to achieve the energy management. Simulation models are designed based on PSCAD/EMTDC platform, corresponding control strategies. Results show that the hybrid energy storage system can achieve good tracking of daily load forecast, and real-time power adjustment on the DC bus, reducing the adverse effects caused by output fluctuations of PV arrays on the microgrid. So the effectiveness of control strategies designs is verified.