特高压电网最大风电渗透率计算方法

Calculation Method for Maximum Wind Power Penetration of UHV Power Grid

摘要:

随着中国可持续发展战略的不断推进，风电并网容量不断增加，大量风电将通过特高压交直流输电系统由风电资源丰富的“三北”地区传输到东部负荷中心，而风电本身的波动性和电力电子化特点给其在特高压交直流混连系统中的消纳带来了诸多挑战。因此开展高渗透率风电对特高压交直流混连系统安全稳定运行影响的研究，估算系统最大风电渗透率，具有重要的学术创新和工程实践价值。提出了考虑系统频率响应的最大风电渗透率计算方法，分别从大扰动后系统频率响应和风电波动引起的频率偏移两个方面研究了风电渗透率的制约因素，并基于计及风电并网的频率响应（SFＲ）模型计算出相应的最大风电渗透率。研究成果对于未来并网风电场和传输风电的特高压交直流输电系统的规划设计具有一定的指导意义，同时也论证了风电场提供辅助调频服务的必要性。

Abstract:

With the continuous progress of national sustainable development strategy, the grid-connected capacity of wind power in China has been steadily increasing, and a large amount of wind power will be transmitted from the "three north" areas rich in wind power resources to the eastern load center through the UHV AC/DC transmission system. However, the inherent fluctuation and power electronics characteristics of wind power have brought many challenges to its absorption in the UHV AC/DC interconnected power system. Therefore, it is of great significance to study the impact of high penetration wind power on the safety and stability of the UHV AC/DC interconnected power system and further estimate the maximum wind power penetration from both academic and engineering perspectives. A method based on the system frequency response (SFＲ) model is proposed to calculate the maximum wind power penetration considering the system frequency response under both considerable disturbances and wind power fluctuations. This work presents some guidance on planning and design of wind farms and related UHV AC/DC transmission systems in the future, and also demonstrates the necessity of ancillary frequency regulation services from wind farms.