Coordinated control method for wind power plant of double-fed fan to participate in one-time frequency modulation of power system

A double-fed wind turbine and power system technology, applied in wind power generation, electrical components, circuit devices, etc., can solve the problems of relying on the centralized controller of wind farms, geographically distributed, unsuitable for response speed, etc.

Active Publication Date: 2017-05-24
TSINGHUA UNIV
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Problems solved by technology

However, due to the large number of wind turbines in large-scale wind farms and their geographical distribution, centralized control requires the construction of a complex communication network and relies heavily on the wind farm centralized controller
If the centralized controll

Method used

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  • Coordinated control method for wind power plant of double-fed fan to participate in one-time frequency modulation of power system
  • Coordinated control method for wind power plant of double-fed fan to participate in one-time frequency modulation of power system
  • Coordinated control method for wind power plant of double-fed fan to participate in one-time frequency modulation of power system

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Embodiment Construction

[0063] The coordinated control method for the DFIG wind farm participating in the primary frequency modulation of the power system proposed by the present invention includes two control processes, namely, the wind farm coordination controller control process and the DFIG distributed control process, both of which circulate according to a certain cycle Execution, the wind farm coordination controller regularly sends the station layer information to the double-fed wind turbine controller through broadcast communication. The method specifically includes the following steps:

[0064] (1) Establish the energy state evaluation index SOE of the kinetic energy stored in the blades of the doubly-fed fan in the wind farm i :

[0065]

[0066] In the above formula, SOE i Indicates the energy state evaluation index of the stored kinetic energy of the blades of the ith DFIG in the wind farm, ω t,i Indicates the speed per unit value of the i-th DFIG fan blade in the wind farm, ω tmin,...

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Abstract

The present invention relates to a coordinated control method for the wind power plant of a double-fed fan to participate in the one-time frequency modulation of a power system and belongs to the operation and control technical field of the power system. The method comprises the steps of establishing energy status evaluation indexes and power generation level evaluation indexes for fans; setting a communication coefficient matrix between fans; measuring the frequency of the coordination layer of the wind power plant and generating the reference value of the output power of the wind power plant; exchanging power generation level evaluation indexes between adjacent fans, conducting the Newton iteration through the outer loop iteration method, and tracking a reference value generated by the coordination layer; during each iteration step, calculating the approximate Newton direction of the step by each fan through the inner loop recursion method. In this way, the necessary information is provided for the outer loop iteration operation. According to the technical scheme of the invention, the stored kinetic energy of a double-fed fan can be fully utilized, and a coordinated control system is designed to reduce the computational burden of the coordination layer. Meanwhile, based on the second-order convergence of the distributed Newton method, the rapid primary frequency modulation of the overall wind power plant is realized. At the same time, the power can be reasonably distributed among fans, so that the safe operation of the fans is ensured.

Description

technical field [0001] The invention relates to a coordinated control method for a double-fed fan wind farm participating in primary frequency modulation of a power system, and belongs to the technical field of power system operation and control. Background technique [0002] Environmental issues drive the innovation and transformation of the power system, and the development of renewable energy power generation can optimize the energy structure, promote energy conservation and emission reduction, and achieve sustainable economic development. As one of the most representative forms of renewable energy power generation, wind power is widely considered to be an effective alternative to traditional thermal power generation. The rapid development of wind power generation is gradually changing the traditional operation mode of the power system. The most obvious problem caused by the integration of large-scale high-penetration wind power generation is that due to the randomness a...

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Application Information

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IPC IPC(8): H02J3/24H02J3/38
CPCH02J3/24H02J3/386Y02E10/76
Inventor 吴文传张伯明孙宏斌王中冠郭庆来王彬
Owner TSINGHUA UNIV
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