±500 kV多端柔性直流输电系统监视功能设计

Monitoring Solutions for a ±500 k V Multi-terminal VSC-HVDC Transmission System

柔性直流输电系统在交直流系统互联、大规模风光并网等方面具有较强的技术优势,随着高压大容量多端柔性直流输电系统的逐步应用和推广,现有调度主站的监控功能已不能满足其发展需求。文中详细分析了华北±500 k V/3000 MW四端环形柔性直流电网的拓扑结构和关键设备特性,面向半桥型模块化多电平换流器+直流断路器的组网方式,以换流站无人职守为目标,提出了基于主站调度控制系统的监视功能框架,给出了电网建模、信息采集、拓扑分析及智能告警等主要监视模块的功能方案,以支撑对高压大容量柔性直流电网的监视,为后期工程实施提供借鉴。

VSC-HVDC（ voltage sourced converter based HVDC） transmission system has technical advantages in the AC and DC system interconnection,large-scale clean energy grid integration. With the application and promotion of the the high-voltage high-capacity multi-terminal VSC-HVDC transmission system,the master station monitoring function is hard to meet their development need. This paper analyzes the topology structure and key equipment features of ±500 k V/3000 MW four-terminal flexible DC power network. In the objective of unmanned converter stations,a monitoring functional framework based on existing monitoring functions of smart grid dispatching and control system（ SGDCS） is proposed. Based on the most promising VSCHVDC grid configuration of half bridge sub-module based modular multilevel converter（ HB-MMC） ＋ DC breaker,this paper presents the function schemes for 4 important monitoring modules,grid modeling,data acquisition,topology analysis and intelligent alarming. The proposed monitoring functions would be helpful for the project implementation in the future.