电力系统保护与控制2024，Vol.52Issue(13)：59-68,10.DOI:10.19783/j.cnki.pspc.231610
考虑新能源随机波动和T接线的城市电网连锁故障风险评估
Risk assessment for cascading failures in urban power grids considering the random fluctuation of renewable energy and T-connected lines
摘要
Abstract
Massive penetration of renewable energy brings great challenges to the secure operation and reliable power supply of important users in urban power grids,and it is easy for the random fluctuation of renewable energy power to result in cascading failure risks.A cascading failure risk assessment method for an urban power grid considering the random fluctuation of renewable energy outputs and T-connected line switching in a 110 kV power grid is proposed.The influence of the probability distributions of system states is taken into account in the calculation of the failure probability and consequences,and the probabilistic power flow based on cumulants is used to reflect the relationship of the probability distribution characteristics between the system states and renewable energy outputs.Additionally,a mixed-inter nonlinear optimization model to calculate the minimum load shedding considering the T-connection line switching of 110 kV power grid is established.Minimum load shedding is used to characterize the consequence of cascading failures.By deciding the switching state of each group of T-connection lines under faults,the load shedding in cascading failures can be reduced,and the risk of such failures is effectively decreased.The secure operating range of bus voltage of important user loads is described by chance constraints to ensure that the probability of important user loads without failure meets the given confidence level,so as to ensure the secure and reliable power supply for those users.Finally,the correctness and effectiveness of the proposed cascading failure risk assessment method are demonstrated in an actual urban power grid.关键词
连锁故障/风险评估/新能源/概率潮流/半不变量/T接线/混合整数非线性规划Key words
cascading failures/risk assessment/renewable energy/probabilistic power flow/cumulants/1-connected lines/mixed-integer nonlinear programming引用本文复制引用
郭挺,杨梓晴,徐良德,胡林麟,林舜江,刘明波..考虑新能源随机波动和T接线的城市电网连锁故障风险评估[J].电力系统保护与控制,2024,52(13):59-68,10.基金项目
This work is supported by the National Natural Science Foundation of China(No.51977080). 国家自然科学基金项目资助(51977080) （No.51977080）
南方电网公司科技项目资助(GZHKJXM20210047) （GZHKJXM20210047）
