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Dynamic equivalence modeling method for double-fed set wind power station based on action condition of pitch angle

A doubly-fed unit and dynamic equivalent technology, applied in the field of value modeling, can solve problems such as difficulty in realization and low precision, and achieve the effect of small number and convenient realization

Inactive Publication Date: 2011-01-05
HARBIN INST OF TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of low accuracy and difficult realization of the model constructed by the existing doubly-fed unit wind farm dynamic equivalent modeling method in actual production work, the present invention proposes a double-fed model based on the action of the pitch angle. Dynamic equivalence modeling method of wind farm with feeder units

Method used

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  • Dynamic equivalence modeling method for double-fed set wind power station based on action condition of pitch angle
  • Dynamic equivalence modeling method for double-fed set wind power station based on action condition of pitch angle
  • Dynamic equivalence modeling method for double-fed set wind power station based on action condition of pitch angle

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specific Embodiment approach 1

[0011] Specific implementation mode one: combine figure 1 Describe this embodiment, the steps of this embodiment are as follows:

[0012] Step 1: Collect the pre-fault active power, pre-fault terminal voltage and pre-fault wind speed of all DFIGs in the wind farm to be modeled;

[0013] Step 2: According to the pre-failure active power, pre-failure terminal voltage and pre-failure wind speed of all DFIGs in the wind farm to be modeled, extract the eigenvectors reflecting the action of the pitch angle and input them into the support vector machine classifier, and All doubly-fed wind turbines are classified dynamically; all doubly-fed wind turbines are divided into three groups, the first group is the doubly-fed wind turbine whose pitch angle has been activated before the fault; the second group is the pitch angle before the fault does not act, And the doubly-fed wind turbine with pitch angle action during the fault; the third group is the doubly-fed wind turbine with no action...

specific Embodiment approach 2

[0018] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is to further limit the extraction of feature vectors reflecting pitch angle actions in step 2;

[0019] The pitch angle action is obtained through the motion equation of the shaft system:

[0020] 2 H dω r dt = T m - T e formula one

[0021] In formula 1, H is the inertial time constant; T m , T e are the mechanical torque of the wind turbine and the electromagnetic torque of the generator, respectively; ω r is the wind turbine speed;

[0022] According to formula 1, the rotational speed during the fault period is

[0023] ω r = ω r 0 + 1 2 H ∫ ...

specific Embodiment approach 3

[0043] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that each parameter of each equivalent double-fed wind turbine described in step 3 includes six parameters, and the specific calculation process of the six parameters is further limited. for;

[0044] The first parameter, generator parameter

[0045] S eq = mS , x m _ eq = x m m , x 1 _ eq = x 1 m ...

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Abstract

The invention discloses a dynamic equivalence modeling method for a double-fed set wind power station based on the action condition of an pitch angle, relating to the technical field of wind power generation and solving the problem of low accuracy and difficult realization of the existing equivalence modeling method. The method comprises the following steps: firstly, acquiring the active power, generator terminal voltage and wind speed of the double-fed set before the fault of a model to be modeled in the wind power station; according to the parameter, extracting the characteristic vector reflecting the action of the pitch angle, inputting into a support vector machine classifier, and dividing the vector into three cluster; and finally equaling the three clusters into three equivalent double-fed wind power sets respectively and calculating the parameters and the equivalent cable parameter of each set, thereby obtaining a wind power station equivalent model. The modeling method has less number of the equivalent wind power sets, is convenient to use, can more accurately reflect the sychronization point dynamic characteristics of the wind power station, is applied to the dynamic equivalence modeling of the high-capacity wind power station and the impact analysis of the high-capacity wind power station to a power system, and has the important project application value.

Description

technical field [0001] The invention relates to a dynamic equivalent modeling method of a large-scale double-fed unit wind farm that accurately reflects the characteristics of a grid-connected point, and belongs to the technical field of wind power generation. Background technique [0002] With the rapid development of wind power generation technology, doubly-fed units have become the mainstream models in China. In the simulation analysis of large-scale wind farm grid-connected systems, detailed modeling of each DFIG and its control system will greatly increase the complexity of simulation, resulting in long calculation time and low resource utilization. In actual production, for the power grid, the "Technical Regulations for Connecting Wind Farms to the Power Grid of the State Grid Corporation of China (Trial)" stipulates that wind farms should provide models and parameters of doubly-fed wind turbines and wind farm collection systems in a timely manner as The basis for win...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCY02E60/76Y04S40/22Y02E60/00
Inventor 苏勋文
Owner HARBIN INST OF TECH
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