换流站阀厅大电流柔性连接金具导流研究

Research on Diversion of Flexible Connection of Large Current in Value Hall of Converter Station

随着经济的持续高速增长,各行业用电需求加大,在加快特高压骨干电网建设的同时,提高现有电网的输电能力、输电质量成为重中之重。在±800 kV特高压直流输电工程中,额定电流高达6250 A,换流站阀厅金具的载流也相应加大,这对金具的耐热性、可靠性提出了更高的要求。因此,研究换流站阀厅金具的运行可靠性十分必要。对两种大电流柔性连接金具进行分析,应用有限元分析软件ANSYS对金具的温度场进行仿真,对以导电带和铝绞线两种典型的导流结构金具进行Ansoft涡流损耗分析后,再利用ANSYS导入涡损结果,得出金具结构的温度场分布,进而与实际温升试验结果相比较。验证了所采用的有限元仿真计算结果的可行性,同时导电带类金具分流和局部过热现象更明显,为今后大电流换流站阀厅金具的设计提供参考。

As the economy continues to grow at a high speed,the demand for electricity in various industries is increasing.While accelerating the construction of UHV backbone power grids,improving the transmission capacity and quality of existing power grids has become a top priority.In the ± 800 kV UHV DC transmission project,the rated current is up to 6 250 A,and the current carrying capacity of the fittings in the valve hall of the converter station is correspondingly increased,which puts forward higher requirements on the heat resistance and reliability of the fittings.Therefore,it is necessary to study the operation reliability of the fittings in the valve hall of the converter station.The two high-current flexible connection fittings were analyzed,and the finite element analysis software ANSYS was used to simulate the temperature field of the fittings.Ansoft eddy current loss analysis was conducted on the two typical conductive structures with conductive tape and aluminum strands,and then reused ANSYS imports the eddy loss results and obtains the temperature field distribution of the fitting structure,which was then compared with the actual temperature rise test results.The feasibility of the finite element simulation calculation results used is verified,and the shunting and local overheating of the conductive belt-like fittings are more obvious,which provides a reference for the design of the valve fittings of the high-current converter station in the future.