An additional control method and system for doubly-fed fan with optimized system frequency dynamics

Abstract

The invention discloses a doubly-fed wind turbine additional control method and system for optimizing system frequency dynamics. The method includes the following steps: system frequency-related indicators are acquired; the system frequency-related indicators are processed through a signal processor to obtain a frequency correction signal; and the frequency correction signal is added to a q-axis control branch of a rotor-side converter of a doubly-fed wind turbine to control the phase angle position of an equivalent voltage source of the doubly-fed wind turbine so that the doubly-fed wind turbine can help to balance the active power of the system and restrain the change of the system frequency. The system includes a system frequency correction signal generation module used for constructinga frequency correction signal and a system frequency response optimization module used for adding the frequency correction signal to a q-axis control branch of a rotor-side converter of a doubly-fedwind turbine to optimize the dynamic process of the system frequency. In the invention, the dynamic characteristic of the system frequency is optimized by adding a frequency correction signal to a reactive branch, which will not cause impact on the mechanical system of the doubly-fed wind turbine. The negative impact on the equipment is avoided while regulation is realized.

Description

technical field [0001] The invention belongs to the field of power system frequency stability control, and more specifically relates to an additional control method and system for a doubly-fed fan for optimizing system frequency dynamics. Background technique [0002] In recent years, with the increasing proportion of wind power generation in the power system, it has gradually become the core factor that determines the dynamic behavior of the system, and the controller is the core factor that determines the dynamic characteristics of the wind turbine. [0003] The frequency dynamic problem is mainly to study whether the system frequency can be within the acceptable range under the condition of large load or fault disturbance. The speed of system frequency change is determined by the total inertia of the system. DFIG, as a widely used fan type, contributes almost zero to the system inertia under classical control. Therefore, in order to suppress the increase in the frequenc...

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Problems solved by technology

[0005] Aiming at the defects of the prior art, the purpose of the present invention is to provide an additional control method and system for doubly-fed wind turbines that optimize the system frequency dynamics, aiming to solve the problem that the prior art is limited to changing the active power or active current command signal, and the mechanical system of the wind turbine problem causing impact

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