双馈风机的虚拟同步发电机控制技术研究

Research on Virtual Synchronous Generator Control Technology of Doubly-fed Fan

随着风电渗透率的逐渐提高,导致电力系统的转动惯量变小.通过虚拟同步发电机技术(Virtual synchronous generator-VSG)模拟传统同步发电机的外特性,对风电场进行惯量补偿.采用虚拟同步机控制策略的储能系统与风电场并联输出的接口特性模拟同步发电机的外特性,分析了在风速变化下协助风电场实现虚拟惯量控制,减小系统频率振荡的幅值,以及在负荷扰动时用于增大系统惯量实现频率调整的作用,最后讨论了虚拟同步机参数对系统稳定性的影响.通过Simulink建立了由风电场、储能系统和大电网组成的风储并网发电系统模型,仿真结果验证了建立的虚拟同步型双馈风机的适用性.

As the wind power permeability increases,the moment of inertia of the power system becomes smaller.The virtual synchronous generator(VSG)is used to simulate the external characteristics of the traditional synchronous generator,and the inertia compensation is performed on the wind farm.The interface characteristics of the energy storage system in parallel with the wind farm using the virtual synchronous machine control strategy are simulated to simulate the external characteristics of the synchronous generator.The analysis of the wind power to assist the wind farm to achieve virtual inertia control and reduce the amplitude of the system frequency oscillation is analyzed.And the role of increasing the system inertia to achieve frequency adjustment during load disturbance.Finally,the influence of virtual synchronous machine parameters on system stability is discussed.The model of wind-storage grid-connected power generation system consisting of wind farm,energy storage system and large power grid was established by Simulink.The Simulation results verify the applicability of the established virtual synchronous doubly-fed wind turbine.