基于虚拟同步机的参数自适应频率控制策略

Parameter adaptive frequency control strategy based on virtual synchronous generator

为了解决传统虚拟同步机无法根据风机运行状态自适应调整控制参数这一问题,提出了一种基于虚拟同步机的参数自适应频率控制策略。首先,建立虚拟同步机控制方式下的双馈风机模型,并利用根轨迹法分析虚拟惯量和阻尼系数对系统稳定性的影响。在此基础上,提出自适应虚拟同步机控制策略与参数整定方法,建立虚拟惯量和阻尼系数与系统频率的函数关系,并根据风机运行状态确定参数初始值,实现虚拟同步机控制参数随频率变化的动态调整。最后,在Matlab/Simulink中进行仿真。结果表明,所提频率控制策略实现了虚拟惯量和阻尼系数的自适应调节,能够充分利用风机旋转动能,有效抑制频率跌落并提升频率恢复速度,提高系统频率稳定性,有助于将新能源有效融入电网,规避电网安全问题,并为新型电力系统建设提供有效参考。

In order to solve the problem that the traditional virtual synchronous machine cannot adjust the control parameters adaptively according to the running state of the fan,a parameter adaptive frequency control strategy based on virtual synchronous machine was proposed.Firstly,a double-fed wind turbine model under virtual synchronous machine control mode was established,and the influence of virtual inertia and damping coefficients on system stability was analyzed by using root locus method.Based on this,an adaptive virtual synchronous machine control strategy and parameter tuning method were proposed.This method established a functional relationship between the virtual inertia and damping coefficients and the system frequency,and determined the initial parameter values based on wind turbine operating conditions,achieving dynamic adjustment of virtual synchronous machine control parameters with frequency changes.Finally,simulation was carried out in Matlab/Simulink.The results show that the proposed frequency control strategy achieves adaptive adjustment of virtual inertia and damping coefficient,fully utilizes the rotational kinetic energy of the wind turbine,effectively suppresses frequency drops and improves frequency recovery speed,and enhances system frequency stability.The proposed method can fully utilize the rotational kinetic energy of the wind turbine,effectively suppress the frequency drop,improve the frequency recovery speed,and enhance the system frequency stability.The proposed strategy is helpful to integrate new energy into the power grid effectively,avoid the problem of power grid security,and provide an effective reference for the construction of new power system.