Double-fed wind turbine generator subsynchronous oscillation suppression method of broadband rotor additional damping

Abstract

The invention discloses a double-fed wind turbine generator subsynchronous oscillation suppression method of a broadband rotor additional damping, which is implemented in control of a rotor-side converter of a doubly-fed fan and used for suppressing subsynchronous oscillation of a doubly-fed wind turbine generator; the three-phase currents of a double-fed fan rotator is detected; after the rotor current is detected, Park transform is performed on the three-phase currents to form a DQ axis system; filtering is performed by using a filter, sub-synchronous frequency band components of the rotor currents are extracted in real time, and then phase compensation and proportional amplification control is performed, the virtual additional rotor damping is added to an original converter DQ-axis rotor voltage control command. A control strategy of a fan rotor-side converter is changed to perform subsynchronous oscillation suppression, broadband additional damping control is increased on the rotor-side so as to enhance the damping characteristics of a subsynchronous frequency band of the wind turbine generator, the electrical damping of the whole wind turbine generator is enhanced, the subsynchronous oscillation of the system is suppressed; and the method can avoid additional devices, and is conductive to engineering implementation.

Description

technical field [0001] The invention relates to the technical field of electric power system and automation thereof, in particular to a method for suppressing subsynchronous oscillation of a doubly-fed fan by additional damping control of a broadband rotor. Background technique [0002] my country's wind energy resources and loads are distributed inversely. With the increase in the proportion of power electronic devices and renewable energy connected to the grid, the unique multi-scale control mechanism and low-inertia broadband response characteristics of power electronic conversion technology have significantly changed the dynamic characteristics of the power system. The problem of low-frequency oscillation and subsynchronous oscillation in the power grid connected to the new energy grid has become increasingly prominent. In recent years, subsynchronous oscillation in regional power grids involving wind turbines has occurred in many regions, causing large-scale wind turbine...

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Problems solved by technology

[0006] In view of the above-mentioned defects in the prior art, the technical problem to be solved by the present invention is to provide a method for suppressing subsynchronous oscillation of doubly-fed wind turbines with additional damping of the broadband rotor, which can enhance the subsynchronous frequency band damping of doubly-fed wind turbines and reduce the frequency band of doubly-fed wind turbines. The risk of subsynchronous frequency band oscillation in wind farms, in order to partially solve the technical problem that the existing technology cannot suppress subsynchronous oscillation

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