摘要
特高压变压器是特高压电网的重要设备,其短路电压百分比UK%的选择会影响到电网的多个指标。在1 000 k V变电站的模拟系统平台,采用理论计算方法分析了特高压变压器UK%的变化对1 000 k V系统注入500 k V母线的短路电流值的影响;兼顾变压器负载率的改变和是否通过第3绕组进行无功补偿两个方面,通过选取特定范围内的变压器不同的UK%值,运用PSCAD仿真软件,分析和讨论了500 k V母线电压变化情况,得出特高压变压器UK%为15%~23%时任何值均能通过无功补偿或有载调压将500 k V母线电压控制在515~530k V的范围内的结论。此工作可为特高压变压器UK%的选择提供一定的参考。
The ultra high voltage （UHV） transformer is a key equipment in the UHV grid, and the percentage of shortcircuit voltage UK% may affect multiple operating indexes of the grid. The 1 000 kV substation simulation system is built in the paper, and the impact of the variation of UK% on short current injected from 1 000 kV system into 500 kV bus is analyzed through theoretical calculation. Besides, load variation and reactive power compensation are considered, and the voltage of 500 kV bus is discussed and studied in PSCAD when UK% is within the particular scope. It＇ s concluded that the voltage of 500 kV bus can be controlled within the scope of 515-530 kV by means of reactive power compensation or on-load voltage regulation when UK% is controlled within 15%-23%. The work in this paper can provide certain reference for the selection of UK% of the UHV transformer.
出处
《电力系统及其自动化学报》
CSCD
北大核心
2015年第9期74-79,共6页
Proceedings of the CSU-EPSA
关键词
特高压(UHV)
变压器
短路电压百分比UK%
短路电流
运行电压
无功损耗
无功补偿
有载调压
ultra high voltage（UHV）
transformer
percentage of short-circuit voltage UK%
short-circuit current
operating voltage
reactive power loss
reactive power compensation
on-load voltage regulation
