Multi-fault diagnosis and fault-tolerant control of wind turbine system

Abstract

The invention discloses a multi-fault diagnosis and fault-tolerant control method of a wind turbine system. The method comprises the following steps: firstly, establishing a global fuzzy model of the wind turbine system by utilizing the T-S fuzzy algorithm; converting an actuator fault into a sensor fault by utilizing the characteristic of combining the sensor hardware redundancy technology with the actuator fault, and establishing a multi-fault diagnosis logical table to realize multi-fault detection; then, introducing a filter, converting the sensor fault into the actuator fault, establishing a virtual actuator fault, and realizing simultaneous reconstitution of two faults through reconstitution of the virtual actuator fault; finally, revising input and output of a controller based on a fault reconstitution value to realize active fault-tolerant control. The method has the following advantages: diagnosis and reconstitution of the wind turbine system with concurrent actuator and sensor faults can be simultaneously realized, accurate fault information is obtained in a real-time and on-line manner, fault-tolerant control is realized, the capacity of processing unknown faults of the system is enhanced, and the wind energy conversion efficiency under the fault is improved.

Description

technical field [0001] The invention relates to a multi-fault diagnosis and fault-tolerant control of a wind power generation system, which performs active fault-tolerant control on faults based on accurate fault information acquired online and in real time by an FDD unit. Background technique [0002] Wind power is the fastest growing renewable energy in the world, and it has become an indispensable force to solve the world's energy problems. Wind power generation equipment is generally located in high mountains or remote areas far from the coast, where climate change is unpredictable. In such a highly harsh and complex working environment, actuator and sensor failures occur frequently. [0003] The internal structure of the wind power generation system is complex, and there are many components. Among them, the actuator is the most complex, including the transmission system, power generation system, yaw system and hydraulic system, etc., which carry the largest load and hav...

AI Technical Summary

Problems solved by technology

[0005] Most of the current research is aimed at the diagnosis and fault-tolerant control of a single sensor or actuator fault in the wind power generation system. With the continuous improvement of the automation level, the wind power generation system is becoming more and more complicated, and the failure situation is also complex and changeable. The actual system The probability of failure of a single sensor or actuator is low, and the research has great limitations

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