Fault ride-through control method and system for offshore wind power grid-connected system

Abstract

The application relates to a fault ride-through control method and system of a marine wind power grid-connected system, which comprises the following steps: when a fault occurs, making a grid-side converter GSVSC enter a reactive power control mode; when the direct-current voltage exceeds a GSVSC voltage reduction control threshold value, reducing the alternating-current side voltage of a wind farm side converter WFVSC and the wind farm output by using a voltage reduction method; when the direct-current voltage satisfies an energy consumption circuit starting condition, the energy consumption circuit is started; when the fault is cleared, making the GSVSC enter an active power recovery mode; when the direct-current voltage satisfies an energy consumption circuit closing condition, the energy consumption circuit is closed; when the wind farm detects that the fault is cleared, making the wind farm enter the active power recovery mode and no longer reducing the alternating-current side voltage of the WFVSC; when the system reaches a new balance, making the WFVSC and the wind farm enter a normal control mode. The technical scheme provided by the application not only can reduce the configuration capacity of the energy consumption circuit, but also can reduce the working time of the energy consumption circuit; meanwhile, due to the use of the energy consumption circuit, the voltage reduction range is reduced, and the influence on the wind turbine is smaller.

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