引用本文:刘航,黄曼茜,彭茂兰,王海军,许建中,张怿宁.三端直流输电系统大地金属回线转换策略[J].电力自动化设备,2022,42(3):
LIU Hang,HUANG Manxi,PENG Maolan,WANG Haijun,XU Jianzhong,ZHANG Yining.Conversion strategy between ground return and metallic return of three-terminal DC transmission system[J].Electric Power Automation Equipment,2022,42(3):
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三端直流输电系统大地金属回线转换策略
刘航1, 黄曼茜2, 彭茂兰1, 王海军1, 许建中2, 张怿宁1
1.超高压输电公司 检修试验中心,广东 广州 510663;2.华北电力大学 新能源电力系统国家重点实验室,北京 102206
摘要:
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,遍历取小即可明确最优回线转换开关配置站点与回线转换策略,在不影响转换功能的前提下减少工程投资。同时针对优选方案下可能存在的回线转换失败问题,提出了改变各站电流水平的应对措施。计算结果表明,在三端直流输电系统中,所提评估方法能够降低模拟精度需求并选出最优转换开关配置方案与回线转换策略。
关键词:  三端直流输电系统  大地金属回线  转换开关  随机数原理
DOI:10.16081/j.epae.202111006
分类号:TM721.1
基金项目:南网超高压科技项目(012000KK52180016)
Conversion strategy between ground return and metallic return of three-terminal DC transmission system
LIU Hang1, HUANG Manxi2, PENG Maolan1, WANG Haijun1, XU Jianzhong2, ZHANG Yining1
1.Maintenance & Test Center, EHV Power Transmission Company, Guangzhou 510663, China;2.State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China
Abstract:
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.
Key words:  three-terminal DC transmission system  ground return and metallic return  transfer switch  random number principle

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