溪洛渡直流工程换相失败特性及相关因素分析

精确模拟直流逆变器换相失败及功率恢复对电力系统安全稳定分析是十分重要的。将电力系统实时仿真器RTDS连接到溪洛渡直流工程实际的直流控制保护系统装置,分析与评估逆变站换流母线电压跌落、故障类型以及交流系统强度等因素对溪洛渡直流的换相失败和故障恢复特性的影响。研究结果表明,换流母线故障相电压跌落幅度是决定溪洛渡直流逆变器在交流系统短路故障后是否发生换相失败的主要影响因素。

Analysis on the Characteristics of Commutation Failure and Its Related Factors of Xiluodu Guangdong HVDC Project

It is important to make an accurate simulation to the communication failure of DC inverter and the DC system＇ s recovery in analyzing the stability of a DC/AC power sytem. Connecting a real-time simulaton tool （ RTDS ） to the actual control and protection system of Xiluodu-Guangdong HVDC project, this paper analyzes and evaluates the commutation failure characteristics of Xiluodu- Guangdong HVDC project under different cases of the voltage drop on commutation bus, fault types and AC system strength. The re- sults show that the magnitude of voltage drop is the key factor that causes the commutation failure of Xiluodu-Guangdong HVDC pro- ject as a short circuit fault occured in its inverter side.