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Method, system and equipment for calculating external overvoltage of wind turbine generator

A wind turbine and calculation method technology, applied in the field of overpower, can solve problems such as poor accuracy, single infinite large-capacity AC power supply, etc., and achieve the effect of improving safety and reliability and accurate calculation

Active Publication Date: 2020-11-13
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention provides a method, system and equipment for calculating the external overvoltage of wind turbines, which are used to solve the problem of simplifying and equivalenting the connected wind farms to a single infinite large-capacity AC in the study of lightning overvoltages in the prior art. power supply, leading to the technical problem of poor accuracy of external overvoltage calculation results

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  • Method, system and equipment for calculating external overvoltage of wind turbine generator
  • Method, system and equipment for calculating external overvoltage of wind turbine generator
  • Method, system and equipment for calculating external overvoltage of wind turbine generator

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Embodiment 1

[0057] Such as figure 1 As shown, a method for calculating the external overvoltage of a wind turbine provided by an embodiment of the present invention includes the following steps:

[0058] S1: Obtain the lightning current parameters from the meteorological observation station, obtain the structural parameters of the wind turbine from the background system of the wind turbine, and prepare for the subsequent construction of each model by obtaining the lightning current parameters and the structural parameters of the wind turbine in advance;

[0059] S2: Establish the lightning current model according to the lightning current parameters. Since the lightning wave propagated by the lightning current on the conductor is closely related to the length of the conductor, the upper limit cut-off frequency of the lightning wave determines the maximum length of the segmented conductor. Therefore, it is calculated according to the lightning current model Maximum length of segmented condu...

Embodiment 2

[0067] Such as figure 1 as shown in figure 1 As shown, a method for calculating the external overvoltage of a wind turbine provided by an embodiment of the present invention includes the following steps:

[0068] S1: Obtain the lightning current parameters from the meteorological observation station, obtain the structural parameters of the wind turbine from the background system of the wind turbine, and prepare for the subsequent construction of each model by obtaining the lightning current parameters and the structural parameters of the wind turbine in advance;

[0069] S2: Establish the lightning current model according to the lightning current parameters. Since the lightning wave propagated by the lightning current on the conductor is closely related to the length of the conductor, the upper limit cut-off frequency of the lightning wave determines the maximum length of the segmented conductor. Therefore, it is calculated according to the lightning current model The maximum...

Embodiment 3

[0133] Such as Figure 12 As shown, a wind turbine external overvoltage calculation system includes a data acquisition module 201, a segmented conductor maximum length calculation module 202, a wind turbine blade segment R-L-C equivalent model module 203, a wind turbine tower segment R-L-C equivalent model Module 204, the cable coupling equivalent model module 205 in the wind turbine tower, the wind turbine power equipment model module 206, the wind turbine system model module 207, and the external overvoltage calculation module 208;

[0134] The data acquisition module 201 is used to acquire lightning current parameters and wind turbine structural parameters;

[0135] The section conductor maximum length calculation module 202 is used to establish a lightning current model according to the lightning current parameters, and calculate the maximum length of the section conductor according to the lightning current model;

[0136] The wind turbine blade segment R-L-C equivalent m...

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Abstract

The invention discloses a method, a system and equipment for calculating external overvoltage of a wind turbine generator. According to the invention, the circuit characteristics of each part of the wind turbine generator are considered; lightning current, wind turbine generator blades, a wind turbine generator tower, cables in the wind turbine generator tower and wind turbine generator power equipment are accurately modeled; converting the wind turbine generator blades and the wind turbine generator tower into an R-L-C equivalent model; a cable in a wind turbine generator tower forms the characteristic of lightning overvoltage induction according to a cable shielding layer and a cable core; the cable coupling equivalent model in the tower of the wind turbine generator is constructed, so that the influence of wind power plants of different scales as impact and fluctuation power supplies on the electromagnetic transient process during grid connection is considered, the wind power external overvoltage calculation is more accurate, and the operation safety and reliability of a power grid are improved.

Description

technical field [0001] The invention relates to the field of overvoltage, in particular to a method, system and equipment for calculating external overvoltage of a wind turbine. Background technique [0002] Since the AC and DC access methods of offshore wind farms are all transmitted by submarine cables, the impact of intrusive waves from lightning strike lines is not considered. The lightning overvoltage of wind turbines in offshore wind farms is mainly generated by lightning strikes on the blades of wind turbines. point, the tower, and finally to the grounding of the wind turbine grounding device. During the propagation of the lightning current in the nacelle and the tower, it will generate electromagnetic coupling between itself and its internal equipment, forming a high lightning overvoltage. [0003] At present, in the study of lightning overvoltage, the connected wind farm units are simplified and equivalent to a single infinite large-capacity AC power supply, and t...

Claims

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Application Information

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IPC IPC(8): G06F30/20G06F30/3323G06F113/06
CPCG06F30/20G06F30/3323G06F2113/06
Inventor 赵晓凤王增彬庞小峰吕鸿孙帅宋坤宇姚聪伟李盈杨贤
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID