Variable-speed wind turbine generator inertia response simulating control method

Abstract

The invention discloses a variable-speed wind turbine generator inertia response simulating control method. The method comprises the steps that according to the wind turbine generator hub wind speed vw and the wind turbine generator rotating speed omega r, the active-power control reference value P0 of a wind turbine generator is set based on a maximum wind energy power tracking control strategy; extra controls are added through power grid frequency values on the basis of maximum wind energy power tracking control, according to operation conditions of the wind turbine generator, short-time constant-power supporting is carried out through table searching or online adjusting to achieve inertia response simulation, and meanwhile the wind turbine generator active power recovery process is achieved according to a certain power curve. The variable-speed wind turbine generator inertia response simulating control method can overcome the problems that the rotational inertia of a wind turbine generator is not sufficiently utilized, the wind turbine generator is out of a reasonable operation range, inertia control is lack of flexibility, response time is long, particularly, the rotating speed of the wind turbine generator is too low, and the torque and the rotator current of the wind turbine generator are too large in the prior art. The variable-speed wind turbine generator inertia response simulating control method can effectively reduce the frequency deviation amplitude and the rate of change after large frequency disturbance accidents, and improves frequency stability of an electric power system.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a control method for simulated inertia response of variable-speed wind turbines. Background technique [0002] Wind power generation is a clean and renewable new energy generation method, which is of great significance for protecting the environment and saving fossil energy. However, wind power generation is an "unfriendly" power generation technology for the power system due to its volatility, uncertainty and weak support ability of wind turbines to the grid. Power grid companies and dispatching agencies need wind turbines to respond to grid frequency disturbances and maintain grid frequency stability through power converters and other control devices when wind turbines are disturbed. Especially when the frequency of the power grid decreases, it can realize simulated inertia response and transient active power support. [0003] Traditional variable-speed wind tur...

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Problems solved by technology

[0006] In the process of realizing the present invention, the inventors found that in the prior art, there are at least insufficient utilization of the wind turbine inertia response capability, difficulty in controlling physical quantities such as torque and current within a reasonable range, insufficient optimization of the frequency stability support characteristics of the power system, Poor flexibility, long response time and other defects

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