| 引用本文: | 严铭,蔡晖,谢珍建,张哲任,徐政.适用于多端柔性直流输电系统的分布式直流电压控制策略[J].电力自动化设备,2020,40(3): |
| YAN Ming,CAI Hui,XIE Zhenjian,ZHANG Zheren,XU Zheng.Distributed DC voltage control strategy for VSC-MTDC systems[J].Electric Power Automation Equipment,2020,40(3): |
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| 摘要: |
| 在总结多种系统级直流电压控制策略的基础上，提出了一种分布式直流电压控制策略。该控制策略由多座换流站共同控制多端柔性直流输电系统的直流电压，达到改善系统动态响应特性的目的；通过对换流站直流电流分配系数的控制间接调节有功功率。阐述分布式直流电压控制策略的总体结构、稳态控制策略及故障控制策略，在PSCAD/EMTDC仿真平台中针对主从控制、带死区的电压下垂控制、分布式直流电压控制3种控制策略进行典型故障仿真分析。仿真结果表明，分布式直流电压控制策略在典型故障期间的直流过电压水平较低、直流电流波动较小且过渡过程持续时间较短，动态响应特性较好。 |
| 关键词: 多端柔性直流输电 模块化多电平换流器 分布式直流电压控制 直流电流分配系数 故障分析 |
| DOI：10.16081/j.epae.202002011 |
| 分类号:TM721.1 |
| 基金项目:国家电网公司科技项目(SGJSJY00GHJS1900028) |
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| Distributed DC voltage control strategy for VSC-MTDC systems |
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YAN Ming1, CAI Hui2, XIE Zhenjian2, ZHANG Zheren1, XU Zheng1
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1.College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China;2.Economic Research Institute of State Grid Jiangsu Electric Power Co.,Ltd.,Nanjing 210008, China
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| Abstract: |
| Based on summarizing various system-level DC(Direct Current) voltage control strategies, a distributed DC voltage control strategy is proposed. The DC voltage of VSC-MTDC(Voltage Source Converter based Multi-Terminal Direct Current) system is controlled by multiple converter stations in this strategy, and the dynamic response characteristic is improved. Also, the active power is adjusted by controlling DC distribution coefficient of the converter station indirectly. The overall control structure, steady-state control and fault control of the distributed DC voltage control strategy are described. Typical fault simulation analysis is carried out for three control strategies including master-slave control, dead-band voltage droop control and distributed DC voltage control based on PSCAD/EMTDC. The simulative results show that the distributed DC voltage control strategy has smaller DC overvoltage level, smaller DC current fluctuation and less transition duration during typical faults, and the dynamic response characteristics are better. |
| Key words: VSC-MTDC modular multilevel converter distributed DC voltage control DC current distribution coefficient failure analysis |
