储能辅助电网参与调频的控制策略研究

Research on the Control Strategy of Energy Storage System Assisting Grid in Regulating Frequency

目的研究储能电站在风光发电情况下保持电力系统稳态的调节原理与方法,并在此基础上设计了一种虚拟同步发电机三级模型用有源支持控制方式辅助火电机组维持电网频率稳定的主动支撑控制策略。方法利用储能电池快速响应的特性,建立储能系统,对储能换流器的控制进行改进,在传统的控制架构的基础上改进为在电压中加入虚拟阻抗的外环调节器和基于准PR控制器的电流内环控制,深入分析控制策略的原理和同步发电机的对应关系。结果随着新能源渗透率越来越高,在储能电站并网参与频率调节的情况下,频率波动的次数变少。结论控制方法可以给新能源发电系统带来一定的惯性和阻尼,从而增强了系统的稳定性,并且证明了储能电站参与电网调频的必要性和可实施性,为储能电站的分布和储能电池的容量配置提供了一定的实际的参考意义。

Objective The regulation principles and methods of energy storage power plants to maintain the steady state of the power system in the case of wind and solar power generation were investigated,and on this basis,an active support control strategy of virtual synchronous generator three-level model assisting thermal power units to maintain the frequency stability of the grid with active support control was designed.Methods Using the characteristics of the fast response of energy storage batteries,an energy storage system was established to improve the control of the energy storage converter.The conventional control architecture was improved by adding an outer-loop regulator with virtual impedance in the voltage and introducing a current inner-loop control based on a quasi-PR controller.The principle of the control strategy and the correspondence of the synchronous generator were analyzed in depth.Results With the increasing penetration of new energy into the grid,the number of frequency fluctuations becomes less when energy storage power stations are connected to the grid to participate in frequency regulation.Conclusion This control method can bring a certain amount of inertia and damping to the new energy power generation system,thereby enhancing the stability of the system.It also provides the necessity and feasibility of energy storage stations participating in grid frequency modulation,and provides a certain practical reference significance for the distribution of energy storage stations and the capacity allocation of energy storage batteries.