Lhasa Converter Station is the end of the Qinghai-Tibet HVDC interconnection project. In order to solve the weak structure problem of the central Tibet 220 kV power grid

an SVC device is installed at the 35 kV side of Lhasa converter station. Because the No.2 station transformer is also mounted at the 35 kV side

larger transient voltage fluctuation will be generated as the SVC device switches to harm the safety and stability of the station power system

or even to result in auxiliary system outage in converter station

leading to HVDC locking.In this article

a control strategy for the 35 kV side is proposed to eliminate the impact of the transient voltage fluctuation due to SVC switching on the station power system

check the important loads of the station power system

and ensure security and reliability of the station power system.