Active damping control method and system for subsynchronous oscillation of doubly-fed wind turbine generator

Abstract

The invention relates to an active damping control method and system for subsynchronous oscillation of a doubly-fed wind turbine generator and relates to the technical field of high-voltage direct-current power transmission. The method comprises the steps of collecting oscillation components of stator current and / or stator voltage; determining each energy branch in the doubly-fed wind turbine generator converter according to the circulation path of the oscillation components of the stator current and / or the stator voltage in a doubly-fed wind turbine generator converter; determining a functioncorresponding to each energy branch according to the stator current and / or the stator voltage oscillation component; determining an energy compensation branch and an energy compensation function corresponding to the energy compensation branch in the doubly-fed wind turbine generator converter according to the function corresponding to each energy branch and a converter parameter; and controllingthe subsynchronous oscillation of the doubly-fed wind turbine generator by controlling the energy compensation branch according to the energy compensation function. According to the technical scheme provided by the embodiment of the invention, the accuracy and efficiency of the control strategy can be improved.

Description

technical field [0001] The present invention relates to the technical field of high voltage direct current transmission, in particular to an active damping control method and system for subsynchronous oscillation of double-fed wind turbines. Background technique [0002] When the doubly-fed wind farm is transmitted through the series compensation system, the phenomenon of subsynchronous oscillation will trigger the off-grid accident of the wind farm, thus seriously threatening the safe and stable operation of the power grid. At present, the suppression measures of subsynchronous oscillation of doubly-fed wind power grid-connected system have gradually become a research hotspot of many experts and scholars at home and abroad. [0003] However, the existing control strategy is still limited to a certain oscillation frequency point for active suppression, but when the system operation mode changes and the oscillation frequency changes, the existing method is difficult to meet t...

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Problems solved by technology

[0003] However, the existing control strategy is still limited to a certain oscillation frequency point for active suppression, but when the operating mode of the system changes and the oscillation frequency changes, the existing method is difficult to meet the damping requirements in the changing scenario

At the same time, the existing control strategy mainly focuses on improving the stability of the sub-synchronous frequency band of the wind turbine, and rarely considers the super-synchronous frequency band and the base frequency band, which makes the existing control strategy have control blind spots, thereby reducing the accuracy and efficiency of the control strategy

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