fault ride-through strategy of flexible DC for improving transient stability in receiving grid

With the maturity of large-capacity flexible DC transmission technology, it is widely used in large power grids. Flexible DC has flexible and fast adjustment performance. Designing a reasonable control strategy is conducive to improving the security and stability of power system. In this paper, the extended equal area criterion (EEAC) is used to analyze the fault ride through (FRT) strategy of flexible DC in receiving system which affects the transient stability of the system. A new strategy is proposed which can improve the transient stability by optimizing the reactive power control target, the low voltage threshold, the active and reactive current limits and the recovery voltage threshold during FRT. The effectiveness of the new strategy is verified by simulation, which can provide technical support for the control strategy optimization and mode arrangement in a real flexible DC engineering.