Method for establishing equivalent model of external characteristics of wind power plant of doubly fed induction generator (DFIG)

A technology of equivalent models and construction methods, applied in wind power generation, electrical components, circuit devices, etc.

Active Publication Date: 2013-04-03
HUNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Some researchers have obtained the equivalent model of constant-speed and constant-frequency wind farms by combining parameter aggregation and identification methods, which is worth learning, but it is a small disturbance model

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  • Method for establishing equivalent model of external characteristics of wind power plant of doubly fed induction generator (DFIG)
  • Method for establishing equivalent model of external characteristics of wind power plant of doubly fed induction generator (DFIG)
  • Method for establishing equivalent model of external characteristics of wind power plant of doubly fed induction generator (DFIG)

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Embodiment 1

[0087] Model Identification Initial Conditions

[0088] DFIG equivalent model parameter to be identified is α 1 =[R s X'k 1 k 2 the s 0 k p k q ], alpha 2 =[V 0 θ 0 ], where α 1 are independent parameters to be identified, representing equivalent resistance, equivalent reactance, transient voltage amplitude growth rate, transient voltage phase angle growth rate, CPS distribution active power ratio, control equivalent model active power coefficient, and reactive power coefficient; 2 are dependent parameters to be identified, respectively representing the initial value of the voltage amplitude difference and the initial value of the phase angle difference.

[0089] Stator partial current initial value I ds (0), I qs (0) for

[0090] I ds ( 0 ) = [ ...

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Abstract

The invention discloses a method for establishing an equivalent model of external characteristics of a wind power plant of a DFIG, A DFIG overall equivalent model response is shown in the specification, wherein P<total_res>, Q<total_res>, P<s_res>, Q<s_res> and P<grid_res represent a total active response of the DFIG, a stator reactive response of the DFIG and a grid side active response of the respectively, Pc and Qc represent a controlling equivalent model active response and a controlling equivalent model reactive response respectively, and a grid side reactive response is ignored here, and subscripts '-res' represent that responses are equivalent model responses, so that responses are distinguished from simulation model responses. The method for establishing the equivalent model of external characteristics of the wind power plant of the DFIG is high in fitting precision and fast in simulation speed.

Description

technical field [0001] The invention relates to a construction method of a DFIG wind farm external characteristic equivalent model, which belongs to the field of power system load modeling. DFIG refers to a double-fed wind generator, and its English name is Doubly Fed Induction Generator. Background technique [0002] Among various wind turbines, DFIG can generate variable-speed and constant-frequency power, realize decoupling control of output power, and provide certain reactive power support for the grid under the action of low-voltage ride-through control mode. Based on the above advantages, it has become the mainstream type of wind turbine at the present stage. [0003] In order to study the impact of DFIG on the power grid, its model needs to be established. At present, the research focus on DFIG modeling mainly focuses on the construction of detailed simulation models and the establishment of equivalent (or equivalent) models of wind farms, while the literature on the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00H02J3/38
CPCY02E10/76
Inventor 徐振华李欣然李培强朱琳户龙辉
Owner HUNAN UNIV
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