A method and system for suppressing subsynchronous oscillation of a doubly-fed wind turbine

Abstract

The present invention discloses a method and system for inhibiting double-feed wind turbine sub-synchronous oscillation. The system comprises a double-feed wind turbine, an active power damping controller and a reactive power damping controller. The active power damping controller and the reactive power damping controller are configured at the active and reactive power outer loop control modules of the rotor side inverter of the double-feed wind turbine. The active power damping controller is used for receiving an active power signal and outputting an active additional damping power signal to the active power outer loop control module after the active power signal is processed by a filtering module, a phase shift module, a gain module and an amplitude limiting module. The reactive power damping controller is used for receiving a reactive power signal and outputting a reactive additional damping power signal to the reactive power outer loop control module after the reactive power signal is processed by the filtering module, the phase shift module, the gain module and the amplitude limiting module. The double-feed wind turbine adjusts electrical damping according to the active additional damping power signal and the reactive additional damping power signal, and the sub-synchronous oscillation is inhibited.

Description

technical field [0001] The invention belongs to the technical field of power generation, in particular to a method and system for suppressing subsynchronous oscillation of a doubly-fed wind turbine. Background technique [0002] With the rapid development of wind power, the control system of doubly-fed induction generators is widely used due to its special advantages such as being able to capture wind energy to the greatest extent according to the change of wind speed and realizing flexible control of active and reactive power. However, the wind power resources are distributed inversely to the load center. The series compensation technology can greatly increase the system stability limit and thus improve the transmission capacity, and is widely used in high-voltage transmission lines. However, when the series compensation degree is high, electrical resonance with a frequency lower than the rated frequency may be generated in the line due to disturbance. If the natural torsio...

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Problems solved by technology

[0009] Based on the above principles, traditional design ideas such as figure 1 shown, however, in an actual wind power system, the rotor speed offset Δω r It cannot be obtained directly, and the data is generally not collected, which causes inconvenience to suppress the subsynchronous oscillation of the doubly-fed wind turbine

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