Research On Energy Storage Configuration And Energy Management Strategy For Photovoltaic-Energy Storage Integrated Power System

Due to the shortage of fossil fuels and the expectation of depletion,and the real threat of global climate change,promoting distributed generation based on renewable energy has become the inevitable trend of power industry development.Solar energy is a kind of infinite renewable energywith broad application prospects.However,the solar energy is affected by climatic conditions and environmental factors,which are intermittent,fluctuating and random.Leading to the ability of the photovoltaic(PV)power generationsystem to withstand the disturbance is weak.Equipped with energy storage device to make up PV-energy storage integrated power system can solve this problem effectively.In this paper,the energy storage capacity configuration and energy management strategy forPV-energy storage integrated power system are studied.Firstly,the overall structure of PV-energy storage integrated power system,the model of each component and the corresponding control strategy are introduced.The advantages and disadvantages of the two methods to calculate the battery capacity from the point of view of ensuring the stability of power output are analyzed and compared.Different expected output curves are drew according to the difference of PV output abilityunder different weather conditions when configuring the capacity of battery.It has improved the problem that the calculated result will be too large when the gap between the expected power generation and the actual power generation gap is too large,and finally using statistical methods to optimize the results obtained.According to the difference of PV output ability under different weather conditions,a kind of energy management strategy based on climatic conditions for PV-energy storage integrated power system.Adopting different operation strategies according to weather condition in day-ahead scheduling.The rolling adjustment mechanism is introduced to adjust and amend the operation strategy in time when the weather forecast error is occurred.The calculation and simulation results demonstrate that the proposed energy management strategy can not only stabilize the output of PV,but also optimize the system operation cost and improve the economy.