Operation Modeling And Control Strategy Of PV-ES

With the rapid development of economy,energy shortage and environmental pollution problem more and more aroused people's attention,the solar energy for its characteristics such as no pollution,no restrictive became the object of attention,photovoltaic power generation to become the research important topic.However,PV has some volatility and not controllable,poor reliability.The energy storage is an effective method of improving controllability of PV,due to its fast throughput electricity.In this paper,according to the characteristics of between battery and super capacitor,super capacitor hybrid battery energy storage system is proposed,and its control strategy is analyzed.This paper introduces the PV-ES array principles and work,building the molding,according to external characteristics.Then,in order to maintain the PV array can always guarantee the maximum power output control method designed MPPT Boost law.Contribute to the instability of the impact of PV system is running against an energy storage system to do a detailed analysis of each of the batteries and super capacitors were analyzed,through the bidirectional DC/DC converter using PI control the duty cycle of the inverter changes to change the way the storage elements to improve the performance of the charge-discharge current of the energy storage unit.While for the system features including photovoltaic cells,super capacitors and batteries three energy sources,the corresponding energy management strategy,the basic idea is based on the work status of photovoltaic cells and hybrid energy storage devices to ensure the system set up in the three converter under the given operating mode,making the system three power coordination to ensure stability of the system.Finally,the control strategy of PV-ES is verified through simulation,and the results show that the hybrid energy storage system can be quickly balanced to maintain the DC bus voltage changes in the external environment,while reducing the battery capacity can be configured to extend the life of the system.