Multi-time-scale frequency optimization control method for high-proportion wind power system

Abstract

The invention provides a multi-time-scale frequency optimization control method for a high-proportion wind power system. The method is used for a power system containing a thermal power generating unit and a high-proportion doubly-fed wind power plant, and solves the technical problem that the frequency modulation capacity and the frequency modulation speed of a synchronous generator set cannot meet the frequency modulation requirements of a system due to violent wind speed fluctuation or large-scale sudden load change in the prior art. According to the invention, by completely considering theinfluence of wind power prediction errors, load changes, doubly-fed wind turbine generator system deloading control constraints, synchronous generator set frequency modulation capacity and system economy on the doubly-fed generator set frequency modulation capacity, a multi-time-scale frequency optimization control model is established based on the bidirectional frequency modulation capacity of the doubly-fed wind turbine generator system under the deloading control constraint, so that the dynamic deloading of the doubly-fed wind turbine generator system is realized, and the maximization of the economic benefits of a power system is realized on the premise of rapidly and effectively stabilizing power grid frequency fluctuation.

Description

technical field [0001] The invention relates to the field of wind power control, in particular to a multi-time-scale frequency optimization control method for a high-ratio wind power system. 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 frequency stability of t...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the deficiencies of the above-mentioned prior art, the present invention provides a multi-time-scale frequency optimization control method for a high-proportion wind power system, which is used for power systems including thermal power units and high-proportion doubly-fed wind farms, and solves the problem of severe wind speed in the prior art. The technical problem that the frequency regulation capacity and frequency regulation speed of the synchronous generator set cannot meet the frequency regulation requirements of the system caused by fluctuations or large-scale sudden changes in load, fully consider the wind power prediction error, load change, doubly-fed wind turbine load shedding control constraints, synchronous generator set frequency regulation capacity and system The influence of economy on the frequency regulation capacity of DFIG, based on the two-way frequency regulation capacity of DFIG under the constraints of load shedding control, a multi-time scale frequency optimization model is established, so as to realize the dynamic load shedding of DFIG, in a fast and Under the premise of effectively stabilizing the frequency fluctuation of the power grid, the economic benefits of the power system are maximized

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