Abstract:

As the first station of UHV power grid in Fujian, the 500 kV main connection scheme of Fuzhou UHV substation affects the steady and security of local power grid. According to the construction schedule of Fuzhou UHV substation and the characters of Fujian 500 kV power grid, this paper analyzed the 500 kV main electrical connection of Fuzhou UHV substation, from the aspects of network structure, power flow distribution, short-circuit current, economical efficiency and so on. Instead of traditional scheme in which the number of transformer matches the number of 3/2 unit, the recommended scheme for 500 kV main connection of Fuzhou UHV substation is setting up east and west transmission channel respectively. The analysis results show that the recommended scheme combines the actual situation of Fujian power grid, and can efficiently enhance the power transmit thoroughfare of coastal area. The recommended scheme has a better adaptability to the change of future power flow distribution than other schemes, also has the advantages of investment saving, short construction period, convenient operation and maintenance, etc.

Key words: UHV, substation, main electrical connection, short circuit current, power grid planning