基于混合储能的微电网控制策略研究

Research on microgrid control strategy based on hybrid energy storage

微电网优化配置中风光出力的随机性和波动性给微电网的并网运行造成不利影响。为了提升不可控电源出力稳定性,减小直流母线电压波动,提高并网点电能质量,针对传统PI控制的不足,提出一种动态响应速度更快、控制效果更好的自抗扰和二阶低通滤波器复合控制混合储能系统策略,并在Matlab环境下搭建微电网仿真模型。结果表明,该策略可以提高系统的动态响应性能,减小直流母线承受的电压冲击,平抑直流母线电压波动,提高并网电能质量,验证了所提出的混合储能控制策略的正确性和可行性。

The randomness and fluctuation of wind and light output in the optimal allocation of microgrid have adverse effects on the grid⁃connected operation of microgrid.In view of the shortcomings of traditional PI control,a hybrid energy storage system with active disturbance rejection and two⁃order low⁃pass filter is proposed to improve the output stability of uncontrollable power supply.The proposed system has faster dynamic response and better control effect.In addition,a simulation model of microgrid is built in Matlab environment.The test results show that the dynamic response performance of the system is improved,the voltage shock borne by the DC bus is reduced,the voltage fluctuation of the DC bus is stabilized and the power quality of grid connection is improved,which verify the correctness and feasibility of the proposed hybrid energy storage control strategy.