基于二次系统优化的储能变流器惯性提升方法

Inertial lifting method of an energy storage converter based on secondary system optimization

为了提升储能系统的虚拟惯量,提高电力系统的稳定性,针对储能变流器,给出了一种基于二次系统优化储能变流器惯性提升方法。通过构建完整的状态空间模型,分析了在不同控制器参数下系统的动态特性,揭示了虚拟同步机的振荡特性。在此基础上,设计了基于状态观测器的线性二次型最优控制器,并对储能电站二次系统进行优化,在保证交直流系统稳定性的前提下,弥补了传统虚拟惯性控制器对稳定性的不利影响。基于DIgSILENT/PowerFactory和Matlab的联合仿真验证了所构建状态空间模型的精确性和控制器的有效性。

In order to improve the virtual inertia of the energy storage and stability of power systems,an inertia lifting method of an energy storage converter based on secondary system optimization is proposed.A complete state space model of the energy storage converter is built,the dynamic performance of system with different controller parameters is analyzed,and oscillation characteristics of the virtual synchronous machine are revealed.Then a linear quadratic optimal controller based on a state observer is designed and the secondary system of the energy storage station is optimized.The method reduces the adverse impacts of a conventional virtual inertia controller on stability.The accuracy of the proposed state space model and the effectiveness of the controller are verified by the co-simulation of DIgSILENT/PowerFactory and Matlab.