基于双层功率分解的混合储能系统容量配置

Capacity Configuration of Hybrid Energy Storage System Based on Double Layer Power Decomposition

为风电场配置合适的储能系统可以平抑风电有功功率波动、提高系统电能质量。基于风电出力历史数据,提出了双层功率分解方法。第1层采用滑动平均法,在满足国家规定的风电并网要求下,分解出并网功率和混合储能系统的参考功率。第2层采用频谱分析方法,基于混合储能系统参考功率,利用傅里叶变换将其分解为低频分量和高频分量,分别分配给蓄电池和超级电容器吸收。考虑储能设备的荷电状态和蓄电池的循环使用寿命,建立混合储能系统容量配置模型,模型以其年综合成本最小为优化目标。仿真结果验证了双层功率分解方法的可行性,证明了混合储能系统较单类型储能系统在性能上和经济上的优越性。

Suitable energy storage can be configured for the wind power plant to stabilize the fluctuations of wind power and improve the power quality of wind power.Based on the historical data of wind power output,this paper proposes a double layer power decomposition method.The first layer adopts moving average method to decompose the power of the grid-connected power and hybrid energy storage system,according to the wind power grid connected indicators in China.The second layer uses spectrum analysis method and Fourier transform to decompose the reference power of hybrid energy storage system into low frequency component and high frequency component,which are distributed to the battery and the super capacitor,respectively.Considering the state of charge of energy storage equipment and the cycle life of the battery,this paper establishes the capacity optimization model of the hybrid energy storage system,which takes the minimum annual comprehensive cost as the optimization goal.The simulation results verify the feasibility of the double layer power decomposition method,and prove that the hybrid energy storage system is superior to the single type energy storage system in performance and economy.