同步电网的网架电压、输电、结构组成和电网互联

Voltage levels, transmission, structure and interconnection of synchronized power system

就同步电网结合我国6大电网对网架电压、输电、结构组成和电网互联进行了安全性和经济性的分析。提出:交流500kV同步电网可以满足我国到2020年经济发展的需要;直流和独立电源的交流500kV输电是同步电网的基本输电方式;树枝状的供电结构和充分的本地热备用动态无功可以应对同步电网的连锁串级故障和电压稳定的2大安全隐患;电网互联要结合具体情况在可控(直流或背靠背)和不可控(超高压)联网进行优选。

Combined with six regional grids in China, the security and economy about the voltage levels,transmission,structure and interconnection of synchronized power system are analyzed. It is pointed out that,AC 500 kV synchronized power system can meet the demands of China＇s economic development until 2020 year;HVDC and AC 500 kV transmission of independent power sources arc its fundamental power supply modes;the branch-like network structure and the hot-standby dynamic reactive power are the solutions to its cascading faults and voltage instability;the regional grid interconnection could be optimized by choosing between controllable （ordinary or back- to- back HVDC） and uncontrollable （extra-high voltage AC） mode according to practical conditions.