Analysis on Current Control Strategy of Yunnan-Guizhou Interconnection Project

Yunnan-Guizhou Interconnection Project is the first ± 500 kV DC project in the world.By constructing the transmission channel from Luquan converter station in Yunnan, Gaopo converter station in Guizhou and Zhaoqing converter station in Guangdong, The flexible power transmission between Yunnan, Guizhou and Guangdong has been realized.Correspondingly, the function of its control and protection system also meets the requirements of power transmission under different working conditions of three-terminal operation. The control system realizes the angle control by adjusting the current reference value, and then realizes the power control.Therefore, the determination of the current reference value is one of the core functions of the control system. According to the actual situation of DC three-terminal operation, this paper combs the current control logic, that is, the transformation process of current reference value, with reference to the control software.Describe which functions affect the current reference and how.