摘要
同塔双回高压直流线路间存在复杂的故障电磁耦合关系,大大增加了各回高压直流线路故障选线的难度。为此,基于同塔双回高压直流线路故障行波的相模变换,分析了基于现有单回线路模量行波计算方法所得到的同塔双回高压直流线路故障回和非故障回的模量行波特点;利用故障回和非故障回地模波和线模波的积分比值以及地模波的极性的差异,提出了1种基于单回线路信息的同塔双回高压直流线路故障选线方法。基于PSCAD/EMTDC的溪洛渡—广东±500 k V同塔双回高压直流输电系统的仿真结果表明,该方法能在行波到达后1 ms时间内快速、可靠地识别出故障极线,且所需采样频率为与实际工程相符的10 k Hz,具有工程实用性。
The characteristics of voltage and current coupling existing in each pole of double-circuit HVDC are very complicated, making it much harder to select the faulty-pole in each circuit at pole-to-ground fault situation. Therefore, we analyzed the characteristics of modulus traveling-wave for each circuit which was calculated by modulus definition from single-circuit based on the phase-mode transformation of traveling-wave on double-circuit HVDC. Then, according to the difference of the integral ratio of ground-mode and line-mode and the polarity of earth-mode, we put forward a fault-line selection method for double-circuit HVDC based on the information of each circuit. The EMTDC/PSCAD simulation of Xiluodu-Guangdong ±500 k V double-circuit HVDC system shows that the proposed method can identify the fault-line fast and reliably in 1 ms after the detection of fault travelling-wave, and the sampled frequency of protection is 10 k Hz which is consistent with actual project,thus the method is easy to realize in application.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2016年第5期1636-1643,共8页
High Voltage Engineering
基金
国家自然科学基金(51577072)
中央高校基本科研业务费专项资金(2013ZZ028)~~
关键词
高压直流
同塔双回高压直流线路
高压直流线路保护
故障选线
电磁耦合
行波模量积分比值
HVDC
double-circuit HVDC line on the same tower
HVDC line protection
fault line selection
electromagnetic coupling
integral ratio of travelling wave modulus
