摘要
对特高压同塔双回线路中的并联电抗器中性点接小电抗补偿潜供电流的方法进行了研究,分析了该方法补偿潜供电流的原理,得到了4种不同补偿方案下的中性点小电抗的计算公式。以淮南-上海的同塔双回特高压输电线路为例,针对实际线路中的所采用补偿方案,确定出中性点小电抗的取值范围。使用PSCAD/EMTDC仿真软件搭建数学模型,通过计算潜供电流、熄弧时间等主要的技术指标,从中选出抑制潜供电流效果最好的一组中性点小电抗参数。使用优选出的参数,分别对4种方案在不同故障类型、不同故障点位置的潜供电流进行综合比较分析,得到一种最优的补偿方案。并结合补偿效果和经济性,推荐了混合补偿方案,给设计者提供一个有价值的参考。
The principle of secondary arc current compensation by the neutral reactor of shunt reactor for UHV double-circuit lines is discussed and the calculation formulas of neutral reactor for four compensation schemes are obtained. With Huainan-Shanghai UHV double- circuit lines as an example,its value range of present compensation scheme is determined. The math model is established by PSCAD/EMTDC and main technical indexes,such as secondary sac current and extinction time,are calculated,from which the optimal neutral reactor parameters are selected for the optimal suppression of secondary arc current. With the selected optimal parameters,the secondary arc currents are compared among different fault locations and different fault types for four compensation schemes. By synthetical analysis,the optimal scheme is obtained and an effective and economical hybrid scheme is recommended.
出处
《电力自动化设备》
EI
CSCD
北大核心
2009年第11期87-91,共5页
Electric Power Automation Equipment
关键词
特高压
潜供电流
恢复电压
中性点小电抗
最优补偿方案
UHV
secondary arc current
recovery voltage
neutral reactor
optimal compensation scheme
