含混合储能的风储微电网在并离网模式下建模与分析

Modeling and analysis of wind storage microgrid with hybrid energy storage in grid-connected and islanding mode

为提高微电网储能系统利用率,文章建立了超级电容器和磷酸铁锂电池的数学模型,在风力发电机机侧并联超级电容器,风电场并网侧接锂电池,建立了混合储能系统结构,给出了储能系统在并、离网两种模式下的控制策略。在Matlab/Simulink仿真环境中搭建了35 kV风储微电网系统,将实测风速导入模型,通过储能对风电场出力与系统频率响应的仿真,分析了该系统对风电场出力平滑与微电网频率控制的有效性。该策略实现了风电可靠入网与风储微电网离网稳定运行。

In order to improve the utilization rate of microgrid energy storage system,the paper established a mathematical model of supercapacitor and lithium iron phosphate battery,and proposed a hybrid energy storage system structure of parallel supercapacitor at the DC bus of wind turbine and parallel lithium battery outside the wind farm.The control strategy of the energy storage system in grid-connected and islanding mode is given.The 35 kV wind storage microgrid is built in the Matlab/Simulink simulation environment.The actual measured wind speed is introduced into the model.Through the simulation that energy storage responds to wind farm power output and system frequency,the effectiveness of this system on wind farm output smoothing and microgrid frequency control is analyzed.This simulation studies the dynamic response characteristics of the wind storage system in two modes of operation,which can realize the reliable connection of wind power to the grid,and can achieve stable operation under the islanding mode of wind storage microgrid.This provides a certain theoretical guidance for the extensive development and application of wind storage microgrid.