Research On Energy Storage Configuration Of AC/DC Hybrid Microgrid

The AC/DC hybrid microgrid combines the advantages of AC micro-grid and DC micro-grid,so it is currently the focus of research.New energy power generation has the disadvantages of volatility,randomness,uncontrollability,etc.In order to reduce the adverse effects of new energy generation in AC/DC hybrid microgrid,increase the penetration rate of new energy and improve the load characteristics of the system,this paper focuses on the research of the configuration of energy storage in AC/DC hybrid microgrid.The main contents are as follows:Firstly,the components of the hybrid microgrid system are analyzed,and the mathematical models of photovoltaic and energy storage are established.At the same time,the efficiency models of power electronic devices(DC/AC,DC/DC),which occupy important proportion in the AC/DC hybrid microgrid,are established.It lays the foundation for the research on the configuration of energy storage in AC/DC hybrid microgrid.Secondly,this thesis studies the capacity configuration of energy storage for load characteristics optimization,analyzes the effect of energy storage on system load characteristics when different capacities are configured.The optimization strategies of load characteristics of reducing the peak-to-valley difference of net load,increasing the net load rate,and reducing the net load variance are used,and the energy storage output is optimized.Then,establishes the configuration model of energy storage optimization load characteristics,to minimize cost of the configuration of the storage energy,this thesis uses the load characteristic strategies as the constraints,uses a two-layer PSO algorithm to solve the optimal storage capacity.Then,this thesis studies the energy storage position configuration in AC/DC hybrid microgrid,applies the operation strategy of the system decreasing the peak valley difference,analyzes the power loss of energy storage,which is under the specific capacity of the system access to the AC side,DC side,and on both sides of the AC/DC.Then,establishes the configuration model of energy storage access to the location and to minimize the running loss of the system,this thesis studies the optimal position of the storage energy of specific capacity,uses the Particle Swarm Optimization(PSO)algorithm to solve the model.Finally,this thesis researches the combination configuration method of energy storage converter,and sets up the energy storage combined configuration model of the converter,on the basis of the configuration of the location and the capacity,according to different levels of power energy storage efficiency model of the converter.To minimize energy storage converter running loss as the goal,this thesis solves the optimal combination scheme of the energy storage converter by combining energy storage converter operation constraints,and optimizing the allocation power of energy storage of inverter.