摘要
随着新能源替代同步机接入电网的比例不断攀升,系统电压支撑能力下降,故障点电压跌落可引发新能源规模化进入低电压穿越。为刻画电力系统故障扰动后的稳定运行风险及指导稳定控制措施量选取,扰动引发新能源低电压穿越风险与系统短时有功冲击量的快速准确评估显得尤为重要。为此,从机理解析层面,首先计及故障期间发电机暂态支撑与新能源低电压穿越无功支撑作用,改进传统电压交互因子法,提出适用于大电网的故障扰动期间新能源节点电压跌落评估方法。进一步,基于新能源暂态机电尺度功率响应特性,提出系统规模化新能源低电压穿越短时有功冲击量快速评估方法。最后,以含新能源的新英格兰39节点系统为例,仿真验证了所提短时有功冲击量评估方法的有效性。
With the increasing proportion of renewable energy replacing synchronous generators,the system voltage support capability decreases,and the voltage drop at the fault point can trigger large-scale renewable energy to enter low voltage ridethrough(LVRT).In order to describe the stable operation risk after the power system fault disturbance and guide the selection of stability control measures,it is particularly important to quickly and accurately assess the LVRT risk of renewable energy caused by disturbances and the short-term active power impact of the system.Therefore,from the perspective of mechanism analysis,the transient support of the generators during faults and the reactive power support of renewable energy entering LVRT are firstly considered.The traditional voltage interaction factor method is improved,and an assessment method for the bus voltage drop of renewable energy during fault disturbances suitable for large-scale power grids is proposed.Furthermore,based on the transient power response characteristics of renewable energy on the electromechanical scale,a rapid assessment method for the short-term active power impact of LVRT of system large-scale renewable energy is proposed.Finally,taking the New England 39-bus system with renewable energy as a case,the effectiveness of the proposed assessment method for the short-term active power impact is verified through simulation.
作者
朱玲
姜涛
薛峰
刘福锁
黄锡芳
李威
ZHU Ling;JIANG Tao;XUE Feng;LIU Fusuo;HUANG Xifang;LI Wei(School of Electrical Engineering,Northeast Electric Power University,Jilin 132012,China;State Grid Electric Power Research Institute(NARI Group Corporation),Nanjing 211106,China;State Key Laboratory of Technology and Equipment for Defense Against Power System Operational Risks,Nanjing 211106,China)
出处
《电力系统自动化》
北大核心
2025年第8期149-158,共10页
Automation of Electric Power Systems
基金
国家电网有限公司科技项目(5100-202440016A-1-1-ZN)。
关键词
新能源
电压跌落
节点电压评估
低电压穿越
短时有功冲击
renewable energy
voltage drop
bus voltage assessment
low voltage ride-through
short-term active power impact
