摘要
随着高渗透率新能源并网,同步发电机被逐渐替代,传统惯量支撑元件已经很难保证系统的频率稳定。为提高电力系统的频率稳定性,需要充分利用换流器高占比电力系统中的可控元件,提供虚拟惯量。首先,提出一种考虑系统动态频率响应特性的最小惯量估计方法,通过计算风电-储能并网系统的等值惯性时间常数,构建满足系统频率稳定性的惯量安全区间;然后,基于惯量安全区间,针对发生不同功率缺额时,系统频率稳定性与虚拟惯量之间的关系进行了机理阐释与量化分析;通过判断当前运行点是否位于安全区间内,可为频率稳定提供控制手段。最后,通过PSCAD/EMTDC仿真验证了所提方法的有效性和可行性。
With the integration of high penetration of renewable energy,synchronous generators are gradually replaced,and the traditional inertia support element is difficult to ensure the frequency stability of the system.To improve the fre⁃quency stability of power system,it is necessary to make full use of the controllable elements in the converter dominat⁃ed power systems to provide virtual inertia.First,a minimum inertia estimation method considering the dynamic fre⁃quency response characteristics of the system is proposed.The equivalent inertia time constants of a wind power-energy storage grid-connected system are calculated,and the inertia security interval satisfying the frequency stability of the system is constructed.Then,based on the inertia security interval,the correlation between frequency stability and virtu⁃al inertia in the case of different power shortages is deduced and analyzed quantitatively.The determination of whether the operating point is within the security interval can provide a control method for frequency stability.Finally,the effec⁃tiveness and feasibility of the proposed method is verified by PSCAD/EMTDC simulations.
作者
张桂红
刘飞
王世斌
李积泰
ZHANG Guihong;LIU Fei;WANG Shibin;LI Jitai(Economic and Technological Research Institute,State Grid Qinghai Electric Power Company,Xining 810008,China)
出处
《电力系统及其自动化学报》
CSCD
北大核心
2022年第7期81-87,共7页
Proceedings of the CSU-EPSA
基金
国网青海省电力公司科技项目(SGQHJY00GHJS2100130)。
关键词
安全区间
同步发电机
频率稳定
并网能力
虚拟惯量
security interval
synchronous generator
frequency stability
grid-connection capability
virtual inertia
作者简介
张桂红(1982-),女,硕士,高级工程师,从事电网规划设计及新能源并网发电技术研究。Email:24392121@qq.com;刘飞(1988-),男,硕士,高级工程师,研究电网规划设计及新能源并网发电技术。Email:1047265141@qq.com;王世斌(1995-),男,本科,工程师,研究电网规划设计及新能源并网发电技术。Email:1047265141@qq.com。
