中国电机工程学报2024，Vol.44Issue(5)：1701-1711,中插3,12.DOI:10.13334/j.0258-8013.pcsee.222402
高比例电力电子电力系统过电压(二):交流对称故障下暂时工频过电压机理
Overvoltage of the Power System Integrated With High Proportion of Power Electronics Equipment(Ⅱ):Mechanistic Analysis of Transient Power Frequency Overvoltage Caused by AC Symmetrical Fault
摘要
Abstract
With the growing penetration of renewable energy sources,the problem of transient power frequency overvoltage caused by disturbance has become increasingly serious,which may lead to a large-scale off-grid accident of renewable energy sources and threat the operation of the grid.The low voltage ride through(LVRT)characteristics of the renewable energy sources directly affect the overvoltage level.There is an urgent need for in-depth research on overvoltage mechanism.This paper first analyzes the reason of overvoltage of high renewable penetration power system caused by AC symmetrical fault.Then a simplified model for analysis considering LVRT strategy of renewable energy sources is introduced.Further,after three-phase short-circuit fault clearance,the maximum overvoltage of the renewable energy source terminal is analyzed based on the vector relationship.Moreover,the influence of different LVRT strategy and system parameters on voltage rise is analyzed.Next,equivalent reactive current coefficient ranges avoiding off-grid accident are derived.Considering both reactive power support requirements of renewable energy during the fault and voltage safety constraints of renewable energy after fault clearance,the reasonable value ranges of the equivalent reactive current coefficient under different system strengths are analyzed.Finally,the time domain simulation is used to verify the validity of the theoretical analysis.关键词
高比例电力电子电力系统/暂时工频过电压/机理分析/低电压穿越控制Key words
power system integrated with high proportion of power electronics equipment/transient power frequency overvoltage/mechanistic analysis/low voltage ride through control分类
信息技术与安全科学引用本文复制引用
徐式蕴,孙华东,王姝彦,王晶,毕经天..高比例电力电子电力系统过电压(二):交流对称故障下暂时工频过电压机理[J].中国电机工程学报,2024,44(5):1701-1711,中插3,12.基金项目
国家自然科学基金项目(51977197,U2166601,51907179). Program Supported by National Natural Science Foundation of China(51977197,U2166601,51907179). （51977197,U2166601,51907179）
