Improved Brushless Synchronous Generator model to study the turn-to-turn short circuit fault

The turn-to-turn short circuit (TTSC) fault is one of the most common faults in Brushless Synchronous Generator (BLSG). The robust TTSC fault detection, diagnosis and protection techniques require better understanding of the BLSG behaviour during such conditions. This paper presents an improved mathematical model of the main generator in BLSG with TTSC on a stator phase windings. In the proposed BLSG model, the performance under high degree of TTSC fault is improved by combining the d-q model approach and Winding Function Approach (WFA). The d-q model approach is used to keep the model simple for the development of online model based condition monitoring, and the WFA is used to improve the accuracy of the model under TTSC fault condition. The WFA is also used to consider the saturation effect in the model to improve the model accuracy under high degree TTSC fault condition. The verification results showed that the developed BLSG model is able to provide accurate and consistence performance under wider range of TTSC fault in the stator windings.