Introduction

Faults and failure are two fundamental concepts in system reliability design [1].

• Fault: an unpermitted deviation of at least one characteristic property or parameter of the system from acceptable/usual/standard condition preventing the WT from generating electricity;
  
• Failure: a permanent interruption of a WT systems ability to generate electricity under specified operating conditions.

A WT fault in is a physical defect, imperfection or flaw that occurs within the system, for example gearbox or generator bearings which are above the expected operating temperature. This may cause a subsequent failure, such as the inability to generate electricity. However, it is important to note that not all system faults lead to system failure [2].

The aim of an Fault Detection and Diagnosis (FDD) is to avoid failure for a number of prescribed fault scenarios.

References & Resources

1. S. Donders (2002) Fault Detection and Identification for Wind Turbine Systems: a closed-loop analysis, Master’s Thesis.
2. M.N. Zaggout (2010) Condition Monitoring Using the Wind Turbine Generator Control Loop, 1st Year Report – Progressing for the Degree of Doctor of Philosophy.