摘要
按照国家电网特高压输电规划,未来2~3年特高压交直流将接入江西电网。利用综稳计算程序PSASP详细分析了特高压交直流接入后江西电网短路电流水平,研究了目前应用最广泛的短路电流限制措施。对短路电流交流分量达到开断遮断电流90%的节点进行直流分量衰减时间常数计算,研究了江西电网短路电流直流分量对断路器开断能力的影响。分析了江西电网短路电流增加的原因,并提出了应对短路电流超标问题的措施和方法。
AC/DC UHV will be connected to Jiangxi power grid in the next 2 or 3 years according to the national high-voltage transmission plan. The short-circuit current level of Jiangxi power grid is analyzed when it is supplied to AC/DC UHV by PSASP. The most widely used short-circuit current limitation methods are studied in depth. The DC component decay time constant of the node with 90% breaking current is calculated. The influence of the DC component of the short circuit current on the breaking capacity of the circuit breaker is studied. The reasons of the short-circuit current in Jiangxi power grid increasing are studied. The measures and methods of dealing with the excessive current are proposed applied in Jiangxi power grid with UHV.
作者
章勇高
廖赟
苏永春
王帅
Zhang Yonggao;Liao Yun;Su Yongchun;Wang Shuai(East China Jiaotong University, Nanchang 330013, China;Guangdong Power Transmission and Transformation Engineering Company, Guangzhou 510160, China;Electric Power Research Institute of State Grid Jiangxi Electric Power Company, Nanchang 330096, China)
出处
《电测与仪表》
北大核心
2018年第10期34-39,共6页
Electrical Measurement & Instrumentation
基金
国家自然科学基金资助项目(51467006)
江西省科技厅科技专项-工业支撑项目(20151B8E5011)
关键词
江西电网
短路电流
特高压
直流分量
Jiangxi power grid
short-circuit current
UHV
DC component
