高压直流双线并联运行故障选线策略

The Fault Line Selection Strategy for HVDC Parallel Line

针对高压直流输电工程中双线并联运行方式,在总结了交流小电流接地选线经验的基础上,分析了已投运直流输电工程线路故障的特征,提出了双线并联运行故障选线策略,并将其分为与行波保护及电压突变量保护相配合的暂态故障选线策略和与线路低电压及线路纵差保护相配合的整流侧稳态故障选线策略以及逆变侧稳态故障选线策略三部分,阐述了上述三部分故障选线策略的逻辑,RTDS仿真模型验证了高压直流双线并联运行故障选线策略的正确性。

In order to decrease transmission losses, double-line parallel operation mode is adopted in some high voltage direct transmission （HVDC） projects. However, only one line fault locator is configured due to the investment consideration and the limit of mounting position. Aiming at solving this problem, a fault line selection strategy is proposed based on the AC fault line selection experience and the analysis of the characteristic of DC line fault. The strategy is divided into transient fault line selection, rectifier steady fault selection and inverter steady fault selection. The proposed strategy is validated by real-time digital simulator （RTDS） system.