Diagnosis method and monitoring method for turn-to-turn short circuit fault of double-winding synchronous wind driven generator

Abstract

The invention discloses a diagnosis method and monitoring method for a turn-to-turn short circuit fault of a double-winding synchronous wind driven generator, and the diagnosis method comprises the following steps: 1), controlling a stator winding to serve as a testing winding when a target generator is in a stationary state, applying a testing voltage to the testing winding through a wind power converter, and enabling the other winding to serve as an induction winding; 2), diagnosing the state of a single-winding turn-to-turn short circuit fault according to the size relation between a three-phase induction voltage of the induction winding and the linear voltage of the testing winding. The monitoring method carries out the turn-to-turn short circuit fault diagnosis according to the above diagnosis method after the self-inspection of the wind power converter and the start of the target generator, and gives a fault alarm if the fault is diagnosed. The method can timely diagnose and monitor an early stator single-winding turn-to-turn short circuit fault of the double-winding wind driven generator, is simple for implementation, does not need auxiliary equipment and complex calculation, and is accurate in diagnosis result.

Description

technical field [0001] The invention relates to the technical field of fault detection of a synchronous wind power generator, in particular to a method for diagnosing and monitoring a short-circuit fault between turns of a double-winding synchronous wind power generator. Background technique [0002] Wind turbines based on synchronous wind generators (including two types of permanent magnet and electric excitation synchronous wind generators) are currently mainstream wind turbine products, with active power and reactive power that can be independently adjusted and a wide range of speed regulation Etc. After the wind turbine has been in operation for a period of time, the mechanical and electrical components will gradually expose some faults. Therefore, in order to ensure the stable and efficient operation of the wind turbine, timely diagnosis, early warning and maintenance of the key components of the wind turbine are of great significance. [0003] Large-scale synchronous ...

AI Technical Summary

Problems solved by technology

When an inter-turn short circuit occurs in the stator winding, a large amount of eddy current will be generated in the short circuit, and the generated local heating will greatly shorten the insulation life around the faulty coil. If the fault is not detected in time, the fault will continue to expand, resulting in grounding short circuit or The short circuit between phases and the temperature of the motor will continue to increase until the motor is completely damaged. Therefore, it is necessary to diagnose and warn the early stage short circuit fault of the stator single winding of the synchronous wind turbine, so as to detect and remove the fault point in time at the initial stage of the fault. very necessary

[0004] At present, the inter-turn short-circuit fault diagnosis for synchronous wind turbines is usually based on the analysis of the stator current using Fourier transform, wavelet transform, and empirical mode decomposition. However, this type of fault diagnosis method has poor sensitivity to the current signal on the one hand. , the implementation is complex and the detection accuracy is not high; on the other hand, the signal analysis technology requires a large amount of calculation, and it is difficult to realize timely fault diagnosis

If the fault diagnosis of wind turbines is realized through testing instruments, since wind turbines are generally installed in deserted places, the on-site environment is harsh, and each wind turbine is unattended, only centralized remote monitoring is realized through the wind farm management center, and the wind power The generators are all installed in the engine room at a height of nearly 100 meters from the ground. Therefore, testers need to carry special test instruments and climb nearly 100 meters from the bottom of the tower to enter the engine room to test the generators. It is very inconvenient to implement and is not suitable for The application environment of the wind farm, and it is also difficult to achieve timely detection

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