建议直流远送/稳控互联各大区强化的同步网,避免全国1000kV联网

Recommendation of HVDC transmission/interconnection for every strengthened regional grids,avoiding countrywide 1000kV interconnection

建议按现行稳定导则的分区原则、继续运用直流输电实现直流远送/稳控互联各大区强化的同步网,这比全国1000kV联网安全、经济。认为交流1000kV线路用于长距离输电不如直流输电,用于中、短距离输电不如同塔双回500kV紧凑型线路,特别是交流1000kV线路的安全性和环保性都不如其他两者。结合美国2030年联网预想、欧洲电网可行性研究和联合国的联网文件,分析世界电网长远发展趋势,将来都不会在现有电压电网上再叠加交流1000kV电网。应继续通过直流输电保持分区独立、贯彻分层原则,强化和充分发挥各级电网和线路的输电能力,同时从电网规划开始采取有效的方法解决短路容量和直流多落点问题。

It is recommended to continue implementing HVDC transmission/interconnection for strengthened regional grids according to the zoning fundamental of ＂Power System Security ＆ Stability Criteria＂ ,which is more secure and economic than countrywide 1 000 kV interconnection. For the same transmission capacity,it is concluded that,AC 1 000 kV line is worse than both HVDC line for long distance transmission and AC 500 kV line with compact double-circuit tower for short and middle distance transmission. AC 1 000 kV line is also worse than both HVDC and 500 kV lines in security and environmental protection. According to the analysis for long term development of worldwide power grids,including the acquisitions from the America Grid 2030 Vision,the Feasibility Report of European Grids and the Power Grids Document of United Nations,AC 1000 kV grid overlaying the existing power grids would never be achieved in the future. Grid zoning fundamental by HVDC and delamination fundamental should be maintained,and the transmission capacity of networks and lines at different voltage levels should be strengthened. The problems of short circuit current/close-in HVDC inverters should be solved by effective solutions from planning stage.