Comprehensive control system adopting doubly-fed wind generator participated in power grid primary frequency modulation

Abstract

The invention belongs to the technical field of wind power generation, and discloses a comprehensive control system adopting a doubly-fed wind generator participated in power grid primary frequency modulation. The control system comprises a rotor rotary speed control module, a simulation inertia control module, a droop control module, a rotary speed protection and power determination module and apitch angle control module. After the wind generator is participated in frequency modulation, the power grid inertia is equivalently enlarged, so that the doubly-fed asynchronous wind generator can have inertia response on the power grid frequent as the conventional synchronous generator, thereby lowering change rate of the power grid frequency; and by controlling the rotary speed and the pitch angle, the wind generator output is lowered, so that the wind generator has certain active backup capacity to be participated in primary frequency modulation, thereby lowering steady-state error of thefrequency.

Description

technical field [0001] The invention belongs to the technical field of wind power generation, and in particular relates to an integrated control system for a doubly-fed wind power generator participating in primary frequency regulation of a power grid. Background technique [0002] Frequency is one of the most important parameters of power system operation. The deviation of frequency is not conducive to the safe, reliable and economical operation of the power grid, and even has a serious impact on generators and power systems. The primary frequency regulation of the system is when the system power is unbalanced, that is, when the active power generated by the generator is not equal to the active power absorbed by the load, the synchronous generator automatically responds to the system frequency change and adjusts according to the relationship between frequency and active power The process of making contributions by oneself. When the system frequency rises, the generator nee...

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Problems solved by technology

[0003] To sum up, the problems existing in the existing technology are: the response of the traditional generating set to the system frequency is mainly realized by the change of the speed with the system frequency, and the doubly-fed asynchronous wind turbine is decoupled from the active power and the reactive power. Control so that the speed cannot effectively follow the system frequency change

This patent only conducts a detailed study on the frequency modulation control strategy of the wind turbine itself from the frequency modulation capability of the wind turbine itself and the control system of the wind turbine itself, so there will be no elaboration and research on the use of auxiliary energy storage equipment to improve the frequency modulation capability of the wind turbine generator

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