Research On Optimal Configuration And Coordinated Control Strategy Of Hybrid Energy Storage System In New Energy Environment

In recent years,due to the energy crisis and the deterioration of ecological environment,the typical fossil energy of coal and oil has been facing depletion.Therefore,the new energy generation represented by solar energy and wind power is widely used.Because a large number of new energy generation is incorporated into the power grid,its disadvantages such as randomness,volatility and intermittence are gradually exposed,which seriously affects the power quality.The above problems can be solved by adjusting and controlling the energy storage system.However,only a single energy storage unit can not achieve good results,so it is very important to study the optimal configuration and control strategy of hybrid energy storage system.Firstly,each unit of hybrid energy storage system in new energy environment is modeled and analyzed.This paper describes the basic principle of photovoltaic and wind power generation,analyzes the working characteristics and the control of charge and discharge of battery and super capacitor.In view of the environmental protection hydrogen energy storage system,the mathematical model is established from two parts: the electrolytic cell and the fuel cell.Secondly,aiming at the problem of optimal configuration of hybrid energy storage system,a wind solar hybrid power generation system with hybrid energy storage is constructed.The super capacitor and battery are used as hybrid energy storage in order to optimize the capacity configuration.According to the whole life cycle cost of the system,the objective function of system is established.Under the condition of satisfying the power supply reliability index and other constraints,particle swarm optimization(PSO)and quantum particle swarm optimization(QPSO)are used to solve the optimization problems.It can be seen that the quantum particle swarm optimization algorithm can get better optimization parameters,not only accelerate the convergence speed,but also reduce the whole life cycle cost of the system,and optimize the capacity allocation of the energy storage system.Then,in order to study the control strategy of hybrid energy storage system,the hybrid energy storage system composed of battery and super capacitor is applied in the background of photovoltaic power generation.In the aspect of control strategy,it analyzes DC bus voltage control strategy,hybrid energy storage system power distribution strategy,bi-directional DC/DC converter control strategy and energy storage system limit management strategy to achieve the coordination between battery and super capacitor.Finally,the simulation analysis is carried out in the off-grid and on-grid modes respectively.The results show that under the proposed control strategy,not only the energy management is realized,the life loss of energy storage equipment is reduced,but also the stability of new energy grid connection is effectively improved,and the power quality is guaranteed.Finally,in view of the concept of green energy development advocated by the state,because of the serious pollution after the waste of storage battery,and hydrogen energy as a green and clean energy,has the characteristics of combustion pollution-free,convenient storage and transmission.So hydrogen energy storage replaces battery,it forms a hybrid energy storage system with supercapacitors,and the system control strategy is studied.A hybrid energy storage system including photovoltaic array,electrolyzer,fuel cell and super capacitor is constructed.Considering the upper and lower limits of the voltage of the super capacitor and the great loss of the life caused by frequent start and stop of the electrolyzer,a reasonable power coordinated control strategy is proposed.According to the three operating conditions of the system,through coordinating the output of each unit,the DC bus voltage is stable and the solar energy resource is utilized to the maximum.