三端直流输电系统大地金属回线转换策略

针对现有三端直流输电系统大地、金属回线转换策略存在未考虑转换开关配置站点影响以及开关选型时直接采用随机数模拟精度有限的问题,提出一种将偏微分与随机数原理相结合的三端直流输电系统转换开关配置评估方法.通过循环求偏微分逐次降低目标函数中自变量个数,该方法可以准确评估不同配置方案及转换策略对应的转换开关分合能力需求,遍历取小...

Conversion strategy between ground return and metallic return of three-terminal DC transmission system

Aiming at the problem that the existing ground return and metallic return conversion strategies of three-terminal DC transmission system do not take into account the influence of switch configuration stations, and the precision of directly adopting random number simulation is limited in switch selection, an evaluation method for transfer switch configuration of three-terminal DC transmission system combining partial differential and random number principle is proposed. The number of independent variables in the objective function is reduced step by step by cyclic partial differentiation, and this method can accurately evaluate the opening and closing capacity requirements of transfer switches corresponding to different configuration schemes and conversion strategies. The optimal return transfer switch configuration stations and return conversion strategy can be determined by minimum the ergodic process, and engineering investment can be reduced without affecting the transfer function. At the same time, aiming at the possible failure of return conversion problem under the optimal selected schemes, the countermeasures for changing the current level of each station are put forward. Calculative results show that in the three-terminal DC transmission system, the proposed evaluation method can reduce the simulation precision requirements, and select the optimal switch configuration scheme and return conversion strategy.