Method for diagnosing stator inter-turn short circuit fault of doubly-fed fan based on D-S information fusion algorithm

A technology of inter-turn short-circuit fault and doubly-fed fan, which is applied in the direction of measuring devices, instruments, and measuring electricity, can solve the problems of grid stability damage, fan maintenance cost increase, and high cost, so as to improve accuracy and reliability, and not The effect of reducing certainty and improving recognition ability

Inactive Publication Date: 2018-12-28
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Fault detection and maintenance of key components of wind turbines have always been valued by people. However, with the development of wind turbines from land to sea and the increasing capacity of single units, the maintenance cost of wind turbines has greatly increased. cause great damage
At this time, the traditional fault detection and maintenance methods are difficult to meet the requirements
In addition, wind turbines are installed on pole towers, which are generally tens of meters high, which makes regular inspection and maintenance difficult and expensive

Method used

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  • Method for diagnosing stator inter-turn short circuit fault of doubly-fed fan based on D-S information fusion algorithm
  • Method for diagnosing stator inter-turn short circuit fault of doubly-fed fan based on D-S information fusion algorithm
  • Method for diagnosing stator inter-turn short circuit fault of doubly-fed fan based on D-S information fusion algorithm

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Embodiment

[0032] Attached below Figure 1-6 To further describe the present invention, Figure 6 It is a schematic flow diagram of the diagnosis method of the double-fed fan stator turn-to-turn fault based on the D-S information fusion algorithm for the double-fed fan. This embodiment is based on a D-S information fusion algorithm invented by the simulation software MATLAB / Simulink to diagnose the inter-turn short circuit fault of the double-fed fan stator. The specific situation of this embodiment is set as follows: after 2s, the system has a stator A-phase inter-turn short circuit fault, and after the system is stable, the current of the rotor phase A is used for fault diagnosis. figure 1 It is a schematic diagram of a double-fed fan stator turn-to-turn short circuit fault, which specifically includes the following steps:

[0033] S0. Set up a double-fed fan stator turn-to-turn short circuit model;

[0034] In a specific application, the step S0, building the inter-turn model of th...

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Abstract

The invention discloses a method for diagnosing a stator inter-turn short circuit fault of a doubly-fed fan based on a D-S information fusion algorithm, and belongs to the technical field of fault detection of a power system doubly-fed fan. The diagnosing method comprises the following steps: analyzing a characteristic mechanism of the stator inter-turn short circuit fault, establishing a MATLAB / Simulink-based stator inter-turn short circuit fault model for the doubly-fed fan, determining fault characteristic frequencies of a rotor-side current and a rotor instantaneous power spectrum, completing amplitude estimation of the two fault characteristic frequencies by the Prony algorithm, and further performing D-S information fusion to determine the fault, which effectively improves the faultmode identification ability, and has a reference value for the fault research of large wind farms.

Description

technical field [0001] The invention relates to the technical field of fault detection of a doubly-fed fan in a power system, in particular to a method for diagnosing a short-circuit fault between turns of a doubly-fed fan stator based on a D-S information fusion algorithm. Background technique [0002] At present, countries in the world generally attach importance to wind power generation and vigorously develop it, and the technology continues to progress and become increasingly mature. With the continuous increase of installed capacity of wind turbines, the proportion of total wind power generation capacity in the entire power system is increasing year by year. The reliability and stability of generator set operation put forward higher requirements. Turn-to-turn short-circuit faults account for a relatively large proportion of the fault types of wind turbines, and the damage is very serious. Therefore, analyzing the mechanism of wind turbine stator inter-turn short-circui...

Claims

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Application Information

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IPC IPC(8): G01R31/06
CPCG01R31/72
Inventor 许伯强郑泽慧
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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