高比例新能源电网中储能调频死区优化设定控制策略  

Improved dead zone setting of a frequency regulation strategy for energy storage with high penetration of RESs

作　　者：贺悝 郭罗权 谭庄熙 李欣然[2] 黄际元 陈超洋[1] HE Li;GUO Luoquan;TAN Zhuangxi;LI Xinran;HUANG Jiyuan;CHEN Chaoyang(College of Information and Electrical Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;College of Electrical and Information Engineering,Hunan University,Changsha 410082,China;Changsha Power Supply Branch,State Grid Hunan Electric Power Co.,Ltd.,Changsha 410000,China)

机构地区：[1]湖南科技大学信息与电气工程学院,湖南湘潭411201 [2]湖南大学电气与信息工程学院,湖南长沙410082 [3]国网湖南省电力有限公司长沙供电分公司,湖南长沙410000

出　　处：《电力系统保护与控制》2024年第18期65-75,共11页Power System Protection and Control

基　　金：国家自然科学基金项目资助(52207097);国家重点研发计划政府间国际科技创新合作重点项目资助(2019YFE0118700);湖南省自然科学基金项目资助(2022JJ40150)。

摘　　要：高比例新能源的接入使新型电力系统的净功率波动以及低惯量特性不断增强,给系统频率调节与稳定带来更大挑战。针对日益提升的调频需求,提出一种电网储能死区优化调频控制策略。首先,构建了含储能调频死区的电网频率响应模型,分析了随着新能源渗透率的提升系统频率的变化特性,并阐述了传统死区的不足之处。其次,提出一种基于调频阶段分区的死区优化设置方法,根据频率当前变化状态,设定不同的死区响应模式。基于描述函数法定量分析了死区非线性环节对系统稳定性的影响,给出了考虑死区影响的储能调频下垂系数的稳定边界。此外,提出了储能参与调频的容量配置方法。最后,搭建含新能源场站的区域电力系统模型,对比了不同死区设定下的系统调频动态特性。结果表明,所提新型死区设定方法可以有效改善电网的频率质量,减轻系统的调频负担,且所提死区设定方法不会增加储能的容量配置需求,具有一定的经济实用价值。A high proportion access of renewable energy sources(RESs)enhances the characteristics of net power fluctuation and low inertia of the new power system.This brings greater challenges to frequency regulation and stability.Thus an improved dead zone frequency regulation control strategy for energy storage to meet the increasing frequency regulation demand is proposed.First,the frequency response model of a power system with an energy storage dead zone is introduced.The characteristics of system frequency varying with the increase of RESs penetration are analyzed,and the shortcomings of the traditional dead zone are elaborated.Then,an improved dead zone setting method based on frequency regulation stage division is proposed,where the frequency response modes are set according to the frequency changing status.Based on the description function method,the influence of dead zone nonlinear elements on the stability of the system is quantitatively analyzed,and the stable boundary of the droop coefficient considering the dead zone is given.In addition,a capacity configuration method is proposed for energy storage in frequency regulation.Finally,a regional power system model is built with an RESs farm,and the dynamics are compared with different dead zone settings.The simulation results verify that the proposed dead zone can effectively improve the frequency quality,relieve the frequency regulation burden,and will not increase the capacity configuration.It has a certain economic and practical value.

关 键 词：新能源 储能 死区 调频 稳定性 

分 类 号：TM73[电气工程—电力系统及自动化] TK02[动力工程及工程热物理]