面向小干扰稳定提升的虚拟惯量优化分配模型与方法

Optimal Allocation of Virtual Inertia for Improving Small-signal Stability

虚拟惯量控制使可再生能源发电系统能够具备与火电类似的惯量特性,有利于为系统提供惯性支持。该文研究了虚拟惯量的分布对系统小干扰稳定的影响,并提出面向系统小干扰稳定提升的虚拟惯量优化分配模型与方法。首先,以小干扰分析中的区间振荡模式阻尼比最大为优化目标,以虚拟惯量控制参数为优化变量,频率稳定为约束条件,建立惯量优化分布模型;然后,利用基于灵敏度分析的牛顿法求解该模型,得到虚拟惯量优化分配方案;最后,通过仿真验证所提优化分配方法的有效性。

Inertia provided by renewable energy resources with virtual inertia controller is similar to the inertia of synchronous generator,and it is beneficial for providing inertial support in power system.In this paper,the effects of virtual inertia allocation were studied and an optimization method of virtual inertia allocation for improving small-signal stability was proposed.The damping ratio of inter-area model was set as the objective function of the optimization model.By selecting the parameters of virtual inertia controller as optimization variables and setting frequency stability as the constraint,an optimization model of virtual inertia allocation can be established.A solving algorithm based on Newton method was proposed to obtain the optimal allocation of virtual inertia.Case studies demonstrate the validity of the proposed method.