The Coordinated Control Strategy Research Of Hybrid Energy Storage System Based On Photovoltaic Power Generation

Influenced by natural conditions, such as light and temperature, pv power sourceoutput has great volatility, power grid from the viewpoint of safe operation, therequirements of interconnection of photovoltaic power station should be constantpower characteristics, join the energy storage device in the photovoltaic power station,become the effective measures to solve these problems, through the energy storagesystem to assist in the photovoltaic power station output regulation, so as to improvethe output power of photovoltaic power station features as a whole. Using the energystorage device can to a certain extent, improve the power output of photovoltaicpower supply, but a single storage device it is difficult to meet the requirements, thehybrid energy storage system can have both the advantages of fast response speed andcapacity density, better adapt to a variety of applications.The paper’s main research topic is focused on converter topology and controlmethod in optical storage system, including the energy storage system powerconversion system (PCS) and photovoltaic (pv) power inverter.Firstly, discusses the mathematical model of bidirectional DC/DC converter andthe control method, based on this, advances a kind of applicable to energy storagesystem of triple bi-directional DC/DC converter, and formulate the correspondingcontrol strategy. Through the MATLAB simulation results, proves the correctness andthe effectiveness of the strategy. Then, on the basis of a single photovoltaic invertermodel, puts forward a pv inverter based on SVPWM algorithm parallel circulationelimination method. Writing circulation elimination algorithm in MATLAB S function,and combined with MATLAB/SIMULINK platform, the validation of the proposedcirculation between pv inverter eliminate strategy can effectively eliminate thecirculation, improve the quality of output power.Finally, based on the mentioned above, we design a hybrid energy storage issuitable for optical storage system coordinated control strategy, has set up a platformbased on MATLAB/SIMULINK simulation model of optical storage system.Classified by photovoltaic output of the simulation, the simulation results show thatunder the condition of different pv power, energy storage system can be effective forcharging and discharging movement, coordination of auxiliary photovoltaic (pv) power supply output, improve the operation stability of the power grid.