Optimal Allocation Of The Hybrid Energy Storage System In The Power System With High Penetration Of Wind Power Generation

The human society is facing the severe situation of energy crisis and environment pollution,the wind power generation and other renewable energy received a rapid development thanks to the clean and renewable advantages.However,with the increasing capacity of the grid connected wind power generation,the variability and nondispatchable nature of wind power presents sustainable challenges to the steady operation of power system.The energy storage technologies with rapid development in recent years provide an efficient way to solve the above problems.In this paper,the optimal allocation of hybrid energy storage system with high penetration of wind power is studied.Firstly,some common energy storage technologies are classified,and three kinds of energy storage technologies including the battery energy storage system,pumped storage and the compressed air energy storage,are analyzed in detail.In order to fully consider the variability and particularity nature of wind power,the extraction method of the typical wind power scenes and special scenes are put forward,and they are applied in the optimal operation of energy storage system.And the hybrid energy storage system including the battery and pumped storage is put forward.The battery energy storage system is applied to mitigate the wind power fluctuation and pumped storage power station is applied for peak load regulation in the power grid.The wind power spectrum analysis method based on Discrete Fourier Transform is proposed and the multi-time scale wind power output model is established,which is aimed to make the wind-battery combined output satisfy the upper fluctuation rate limit.By setting the system least annual cost as the objective function,the method to calculate the optimal capacity of the hybrid energy storage system is proposed.Considering about the shortcomings of the centralized power supply mode and the rapid development of distributed generation,the hybrid energy storage system composed of battery and small-scale compressed air energy storage is proposed in the distributed network with distributed wind power source.The battery storage is still applied in mitigation of wind power fluctuation,and considering about the restrictions of capacity and construction site,the compressed air energy storage system is used for peak regulation instead of the pumped storage power station.By analyzing the output difference of pumped storage and compressed air storage system,the peak load regulation method is proposed.And based on the location,capacity determination and optimal operation of the hybrid energy stoage systems,the optimal allocation method of the hybrid energy storage system is porposed.Finally,two cases of the power system and distributed network are studied,and the results verify the effectiveness of the model and the optimal sizing method of the two hybrid energy storage systems.