In this paper

based on the actual fault types appearing in Zhangbei flexible HVDC transmission project

combined with the specific electrical parameters and structure of Zhangbei substation

an integral simulation model consisting of wind farms

busbars and energy consumption device is established.Aiming at the problem of Zhangbei flexible HVDC power grid under the isolated island operation circumstance

when the converter valve is locked

the switching operation of the energy consumption device of the converter station is simulated to research the influence of system power surplus and voltage instability

which verifies that the energy consumption device has a great effect on consuming the redundant power and balancing system voltage.And the simulation of the possible failures of the energy consumption device itself during the switching process is also explored

the variation trend of system power and voltage with fault severity under different fault types is studied

which provides theoretical support for fault analysis and troubleshooting strategy of energy dissipation devices in flexible HVDC power grid.