±800 kV特高压柔性直流桥臂电抗器设计方法

Design Method of Bridge Arm Reactor for±800 kV UHV Flexible DC

依据大型干式空心电抗器设计理论,结合±800 kV特高压柔性直流桥臂电抗器运行工况和结构参数,计算得到了桥臂电抗器导线参数和包封分配电流参数。根据导线参数和包封分配电流参数计算结果,反复调试绕制工艺,控制制造工艺偏差,研制了桥臂电抗器样机,并对桥臂电抗器样机开展了分配电流试验验证和温升试验验证。分配电流试验结果表明,各包封分配电流实测值和理论计算值较为吻合,偏差率最大为48.5%,位于第7包封;偏差率最小为7.4%,位于最外层的第14包封。温升试验结果表明,各包封温升较为平衡,平均温升33.6 K、热点温升55.6 K,远小于工程允许值。该特高压柔性直流桥臂电抗器为行业内首次研发,型式试验合格,投运后运行状态良好,取得了良好的工程效果。

According to the design theory of large dry-type air-core reactor in combination with operation conditions and structural parameters of±800 kV UHV VSC-HVDC bridge arm reactor,the bridge arm reactor wire parameters and the envelope distribution current parameters are obtained by calculation.According to the calculation results of the wire parameters and the envelope distribution current parameters,the bridge arm reactor prototype is developed by way of repeatedly adjusting the winding process and controlling the manufacturing process deviation,and the verification of distribution current test and temperature rise test of the bridge arm reactor prototype are performed.The distribution current test results show that the actual measured value of the distribution current of each envelope is in good agreement with the theoretical calculation value.The maximum deviation rate is 48.5%,which is located in the 7th envelope;the minimum deviation rate is 7.4%,which is located in the 14th envelope in the outermost layer.The temperature rise test results show that the temperature rise of each envelope is relatively balanced,with an average temperature rise of 33.6 K and a hot spot temperature rise of 55.6 K,which are far less than the engineering allowable value.The UHV VSC-HVDC bridge arm reactor is developed for the first time in the industry,and the type test is qualified.The reactor has good result after operation and obtains excellent engineering effect.