Fault diagnosis method and system

Abstract

The invention discloses a fault diagnosis method and system which are used for solving the problems that equipment is started and stopped frequently in the prior art and the like. The fault diagnosis method comprises the following steps of: acquiring redundant measurement data; processing the redundant measurement data and performing fault diagnosis; triggering a fault program and running a restarting program; and setting a threshold value and a restarting hysteresis value during fault diagnosis. According to the method, a fan cannot be started normally after failing until an actually measured value of a part to be measured does not trigger the threshold value added with the restarting hysteresis value, so that the equipment safety is guaranteed, and a phenomenon that the fan is frequently started and stopped because of the same fault is avoided; when a key value of a wind driven power generator set is measured, unnecessary fault alarm can be well avoided by adopting a redundancy technology, so that manmade mistakes are avoided, alarm halt caused by hardware fault of a measurement sensor is reduced, the accuracy of a measured value is improved, and the wind driven power generator set has relatively high performance under a severe condition.

Description

technical field [0001] The invention relates to a fault diagnosis technology, in particular to a fault diagnosis method and system for redundant measurement of wind power generating sets. Background technique [0002] Fault diagnosis of wind turbines is an important part of its electrical control system. The electronic control system monitors the status of various peripheral devices, interface modules and software programs in the system through fault diagnosis, so as to obtain the operating status of the control system. Abnormal situations will automatically give alarm prompts to protect the hardware equipment in the control system, thereby ensuring the service life of key components, providing operators with convenient fault prompts, and facilitating related debugging and maintenance; at present, the wind power generation in the industry Redundancy technology has not been widely used in the measurement of key quantities of the unit, and only a single sensor is used to form ...

AI Technical Summary

Problems solved by technology

[0004] 1) In terms of the measurement of key quantities of wind turbines, the existing schemes do not use redundancy technology on a large scale, which may cause the system to shut down due to sensor failure or measurement error, which reduces the mean time between failures of the wind turbines

[0005] 2) Every time the fault is handled, the fault bit is reset, and there is no time for the corresponding equipment to adjust to the normal state. This will cause the fan to start quickly after the fault is reset, but due to the same error, it will shut down again. Such frequent start and stop will greatly increase the wear and tear of equipment and components and reduce their service life, thereby reducing the service life and mean trouble-free running time of the fan, which has a great impact on the benefit of the fan

Images