Analysis on Power Flow and Voltage Fluctuation of Tie Line in UHVAC Power Grid

Dispatching and control center of UHVAC system pays special attention to voltage fluctuation characteristics.The voltage fluctuation characteristics and power flow in UHVAC system were theoretically analyzed.Based on measured operational data of UHVAC system the relations between busbar voltage and short-circuit capacity,basic power flow and fluctuation of active power under normal operation conditions were quantitatively analyzed;during large disturbance in UHVAC system,voltage fluctuation is more complicated and influenced by both reactive power and active power,therefore the impacting factors of voltage fluctuation under large disturbances were further analyzed.Control strategy for reactive power and voltage of UHVAC system was given to guide the operational control of UHVAC system and its extension projects.