摘要
高比例新能源电力系统中单一短路故障容易引起大规模新能源进入低电压穿越,使得系统承受大容量短时性功率冲击,可能会导致系统暂态最大频率偏差超过低频减载阈值,带来负荷损失。将电化学储能纳入由电网故障事件触发的紧急控制是应对短时性功率冲击下暂态频率越限的有效手段。为此,首先构建了新能源短时性功率冲击下计及储能紧急功率控制的系统频率响应分析模型,进而分析总结了储能释放功率和持续时间对短时性功率扰动下系统频率特性的影响。以此为理论依据,综合考虑短时性功率冲击下的暂态低频与高频安全,提出了避免低频减载的最小储能紧急释放能量计算方法,并给出了满足要求的储能紧急控制功率和持续时间策略。最后,在IEEE 10机39节点系统中验证了分析结果的准确性。
In the power system with high-penetration renewable energy,a single short-circuit fault easily causes large-scale renewable energy into the low voltage ride-through condition,impacting the system with the high-capacity short-time power.This may result in the transient maximum frequency deviation exceeding the low-frequency load shedding threshold and lead to load losses.Including electrochemical energy storage in the emergency control triggered by the power grid fault events is an effective means to address issues of transient frequency over-limitation under the short-time power impact.To achieve this,this paper constructs a system frequency response analysis model considering the emergency power control using energy storage under the short-time power impact of renewable energy.Then,the impact of release power and duration of the energy storage on the frequency characteristics of the system under short-time power disturbances is analyzed and summarized.Based on this theoretical foundation and considering both transient low-frequency and high-frequency safety under the short-time power impact,this paper proposes a method for calculating the minimum emergency release energy of the energy storage to avoid low-frequency load shedding.The power and duration emergency control strategies using energy storage that meet the requirements are provided.Finally,the accuracy of the analysis results is validated in the IEEE 10-machine 39-bus system.
作者
魏玖明
李兆伟
李碧君
吴雪莲
朱玲
赖业宁
WEI Jiuming;LI Zhaowei;LI Bijun;WU Xueian;ZHU Ling;LAI Yening(NARI Group Corporation(State Grid Electric Power Research Institute),Nanjing 211106,China;School of Electrical and Electronic Engineering,North China Electric Power University,Beijing 102206,China)
出处
《电力系统自动化》
EI
CSCD
北大核心
2024年第8期152-161,共10页
Automation of Electric Power Systems
基金
国家电网有限公司科技项目(5100-202240026A-1-1-ZN)。
关键词
紧急控制
频率最低点
电化学储能
低电压穿越
短时性功率扰动
emergency control
frequency nadir
electrochemical energy storage
low voltage ride-through(LVRT)
short-time power disturbance
