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Method for controlling primary frequency modulation of wind turbine generator based on short-time overload

A wind turbine, short-term overload technology, applied to electrical components, circuit devices, AC network circuits, etc., can solve problems such as large and secondary drops

Active Publication Date: 2021-05-18
NANJING UNIV OF SCI & TECH
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Problems solved by technology

Droop control and integrated inertial control under the premise of no load reduction can realize frequency difference adjustment. This frequency modulation is a steady state process, but due to the power mutation when exiting frequency modulation, there will be a large secondary drop problem in the frequency modulation process

Method used

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  • Method for controlling primary frequency modulation of wind turbine generator based on short-time overload
  • Method for controlling primary frequency modulation of wind turbine generator based on short-time overload
  • Method for controlling primary frequency modulation of wind turbine generator based on short-time overload

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Embodiment Construction

[0029] The technical solutions of the present invention will be further described below in conjunction with the drawings and embodiments.

[0030] Step 1) The wind turbine is running in the non-standby state, and the optimal speed running state is realized through the maximum power point tracking control (MPPT).

[0031] Such as figure 1 Shown, C p Represents the wind energy capture coefficient of the fan, which is a function of the tip speed ratio λ and the pitch angle β, and the mechanical power converted by the wind energy captured by the blades of the fan rotor through rotation can be expressed by the formula: express. ρ represents the air density, R represents the radius of the fan rotor, and V represents the equivalent wind speed. Therefore, when the pitch angle β is fixed at a certain value, C p -λ curve is a curve with a sharp peak, at a certain tip speed ratio, C p If the value is the largest, the corresponding mechanical power of the fan is the maximum value, w...

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Abstract

The invention discloses a method for controlling primary frequency modulation of a wind turbine generator based on short-time overload. The method is characterized by employing MPPT before a frequency event and in the process that the wind turbine generator which does not retain power standby operation participates in the primary frequency modulation, after the frequency event occurs, if the frequency deviation is detected to exceed a frequency modulation dead zone, adopting the short-time overload control, and releasing the kinetic energy stored in a rotor of the doubly-fed wind generating set so as to achieve power support, so that on the basis, a novel overload curve and a rotating speed recovery curve are established, the frequency deviation problem is relieved, meanwhile, secondary falling in the primary frequency modulation process is relieved, and the problems of electric energy waste, insufficient adjustment margin and the like caused by conventional load shedding reservation are avoided, and the control performance and the frequency modulation economy of a fan are integrally improved.

Description

technical field [0001] The invention belongs to the technical field of power system operation and control, in particular to a method for controlling primary frequency regulation of wind turbines based on short-term overload. Background technique [0002] In recent years, countries all over the world are facing the dual threats of energy shortage and environmental pollution. With the depletion of traditional energy such as coal and the serious pollution of nature caused by thermal power generation, the power industry urgently needs to find some new energy generation methods to replace some traditional power generation methods. As one of the important renewable clean energy, wind energy has abundant reserves, easy regeneration, wide distribution, and low pollution. It plays an important role in improving the ecological environment, optimizing the energy structure, and promoting sustainable social and economic development. Not only the wind power on land is developing rapidly,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24
CPCH02J3/241
Inventor 卜京朱哲语殷明慧周连俊邹云
Owner NANJING UNIV OF SCI & TECH
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