目前针对特高压直流线路短路故障下的间隔棒承载力及安全状况评估研究较少。文中以某实际±800 kV输电线路为例，通过实时数字仿真器（real time digital simulator, RTDS）动模试验系统搭建包含整流侧、输电线路和逆变侧的真实特高压直流输电网仿真模型，模拟近端短路过程中导线短路电流的变化，分析了保护动作时间对短路电流的影响。建立了包含输电导线、间隔棒的力学动态仿真有限元模型，将短路电流作为载荷施加于该模型，分析了实际短路电流下输电线路位移及间隔棒承载力动态变化过程，对间隔棒安全状况进行了评估。
英文摘要:
At present, there are few studies on the bearing capacity and safety of spacer rod under short-circuit fault of ultra high voltage (UHV) DC transmission line. This paper takes an actual ±800 kV transmission line as an example, a real UHV DC transmission network simulation model including rectifier side, transmission line and inverter side is built through real time digital simulator (RTDS) dynamic model test system. The variation of short circuit current in short-circuit process has been simulated and the influence of protection action time on short-circuit current has been analyzed. The finite element model of dynamic simulation including conductor and spacer has been established. The short-circuit current was applied to the model as the load, and the dynamic variation process of the transmission line displacement and spacer bearing capacity under the actual short-circuit current has been analyzed. The safety status of the spacer is evaluated.
