Frequency emergency control method of power system based on dynamic load shedding of doubly-fed wind turbines

Abstract

The invention provides a power system frequency emergency control method based on dynamic load shedding of double-fed wind turbines, which is used for power systems including thermal power plants and high-proportion double-fed wind farms, and solves the problems caused by violent wind speed fluctuations or large-scale loads in the prior art. The frequency regulation capacity and frequency regulation speed of the synchronous generator set caused by the sudden change cannot meet the technical problem of system frequency regulation requirements. According to the power range where the initial active power unbalance of the power grid is located, the degree of participation of the doubly-fed wind turbine in the frequency control of the power system is different; according to the predicted wind speed and The target value of the load shedding rate of the doubly-fed wind turbine. In different wind speed ranges, the doubly-fed wind turbine adopts different load shedding control methods to stabilize the frequency fluctuation of the power grid and improve the economy of the power system. In order to realize the multi-time scale frequency control of the wind power system Provide a theoretical basis.

Description

technical field [0001] The invention relates to the field of wind power control, in particular to an emergency frequency control method of a power system based on dynamic load shedding of double-fed wind turbines. Background technique [0002] In recent years, the penetration rate of wind power has continued to increase, and its randomness has brought new challenges to the power balance and frequency stability of the power system. Doubly-fed generator sets have fast and flexible power regulation capabilities, and are currently the mainstream models of wind power generation. However, the rotor of the doubly-fed wind turbine is decoupled from the grid frequency and cannot provide inertial response when the frequency fluctuates. The integration of large-capacity wind power weakens the overall inertia of the power grid, which leads to the weakening of the frequency control ability of the power grid under disturbances such as wind speed fluctuations and load mutations, and the f...

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Problems solved by technology

[0007] Aiming at the deficiencies of the above-mentioned prior art, the present invention provides a power system frequency emergency control method based on dynamic load shedding of doubly-fed wind turbines, which is used for power systems including thermal power units and doubly-fed wind farms, and solves the problems caused by wind speed in the prior art. The frequency regulation capacity and frequency regulation speed of synchronous generating units caused by violent fluctuations or large-scale sudden changes in loads cannot meet the technical problems of system frequency regulation requirements. According to the power range where the initial active power imbalance of the power grid is located, the degree of participation of doubly-fed wind turbines in power system frequency control Different; according to the predicted wind speed and the target value of the load shedding rate of the DFIG, the DFIG adopts different load shedding control methods in different wind speed ranges to stabilize the frequency fluctuation of the power grid and improve the economy of the power system. System Multi-Time Scale Frequency Control Provides Theoretical Basis

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