Multi-wind generating set modeling method in large-scale wind power plant

A technology for wind turbines and wind turbines, applied in CAD numerical modeling, design optimization/simulation, etc., can solve problems such as inability to operate, complex system simulation models, and reduced calculation speed, and achieve the effect of shortening simulation time.

Active Publication Date: 2020-02-11
GANSU ELECTRIC POWER DESIGN INST
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

For simulation research, it is feasible to establish a detailed electromagnetic transient simulation model to comprehensively observe the response characteristics of a single wind turbine. However, a large-scale wind farm usually has dozens or even hundreds of wind turbines. Traditional electromagnetic transient simulation calculations Usually, the simulation step size of microsecond level is used. When the system simulation model is large in scale, the calculation speed will be significantly reduced, and it may even fail to run.
Establishing a large number of electromagnetic transient models will complicate the system simulation model, so it is not suitable for application in the study of transient stability of large-scale wind farms. It is necessary to explore a new simulation modeling method and apply it to large-scale wind farms The research of multi-wind turbine system makes the electromagnetic transient state of large-scale wind farm more efficient and faster

Method used

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  • Multi-wind generating set modeling method in large-scale wind power plant

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Embodiment 1; The present invention is used for a simplified model control structure schematic diagram of a single direct drive fan, see figure 1 ; The parameter settings of the direct drive motor model used in the simulation are shown in Table 1.

[0049] Table 1 Direct drive motor model parameters

[0050]

[0051] Step 1. Build a wind turbine model of the wind power generating set; it includes a wind speed model and a gust model, and the wind speed model includes a constant wind model and a gust model. The constant wind model expression is as follows:

[0052]

[0053] In the formula, V meanis the constant wind speed value, t is the time variable, T start1 is the constant wind start time, T end1 is the constant wind end time.

[0054] The gust model expression is as follows:

[0055]

[0056] In the formula, V min is the initial wind speed of the gust, V max is the wind speed after the gust step, t is the time variable, T start2 is the gust start ti...

Embodiment 2

[0083] Embodiment 2; The schematic diagram of the simplified model control structure of a single double-fed fan of the present invention is as image 3 As shown, the parameter settings of the doubly-fed motor model used in the simulation are shown in Table 2.

[0084] Table 2 DFIG model parameters

[0085]

[0086] When the model adopts the stator flux oriented control, the stator flux ψ sd for ψ s , and ψ sq =0. Since the stator side of the doubly-fed generator is directly connected to the grid, the stator voltage amplitude U s is a constant, that is, the grid voltage, and ω e ψ s =U s .

[0087] Step 1, construct wind turbine model of wind power generating set; Same as embodiment 1;

[0088] Step 2, constructing the shafting model of the wind power generating set; same as embodiment 1;

[0089] Step 3. Construct the generator model of the wind turbine generator; the double-fed parameter equation is as follows:

[0090]

[0091] In the formula, L m is the mu...

Embodiment 3

[0103] Embodiment 3; In order to further verify the correctness of the model built by the present invention, under the simulation software PSCAD environment, the electromagnetic transient model and the simplified model of the direct-drive type and the doubly-fed wind turbine are built, and the same parameter unit is under the same working condition comparing.

[0104] The simulation step length is set to 20 and 100 μs, the simulation time is 20s, and the constant wind speed is set to 9m / s. The simulation time-consuming and accuracy comparison results of the fan electromagnetic transient model and the simplified model built on the PSCAD platform are shown in Table 3 and Table 4, respectively. .

[0105] Table 3 Comparison results of model simulation time consumption

[0106]

[0107] It can be seen from the data in Table 3 that under the same simulation step size, the simplified model does not include the thyristor switching process, which is greatly shortened compared with...

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Abstract

The invention discloses a multi-wind generating set modeling method in a large-scale wind power plant. The modeling method comprises the following steps: 1, constructing a wind turbine model of the wind generating sets; 2, constructing a shafting model of the wind generating set; 3, constructing a generator model of the wind generating set; 4, constructing a converter control model of the wind generating set; and 5, constructing a maximum power point tracking control model of the wind generating set. The modeling method is suitable for simulation research of large-scale multi-unit wind power plants, shortens the simulation time, and increases the simulation speed. The modeling method simplifies a shafting model, a converter model and a control system model, ignores a part with a relativelysmall inertia constant in the electromagnetic transient model, enables the converter to be equivalent to a controlled current source, and establishes simplified models of the permanent magnet directdrive and the doubly-fed fan, so that an electromagnetic transient simulation model of a single wind generating set is simplified, and the electromagnetic transient simulation model can keep relatively high consistency with corresponding detailed electromagnetic transient model response characteristics under the working conditions of constant and variable external wind speed.

Description

technical field [0001] The invention belongs to the application field of electromagnetic transient simulation in wind power generation research, and in particular relates to a modeling method for multiple wind power generators in a large-scale wind farm. Background technique [0002] As energy and environmental issues become increasingly severe, wind energy has been widely used in power systems due to its technical and cost advantages. Electromagnetic transient simulation is an important tool to study the response characteristics of large-scale AC and DC systems. At present, the main research object for wind power generation systems is the electromagnetic transient model, including wind turbines, transmission shafts, generators, converters and control systems. model etc. For simulation research, it is feasible to establish a detailed electromagnetic transient simulation model to comprehensively observe the response characteristics of a single wind turbine. However, a large-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06F111/10
Inventor 姚天亮魏刚刘乔李志伟吴兴全瞿继平李召兄刘宏赵琦王虎
Owner GANSU ELECTRIC POWER DESIGN INST
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