Rotary diode failure detection in brushless exciter system of power plant synchronous generator

Reliability and availability of synchronous generator in power plant is related to performance of exciter system that is coupled mechanically and electrically to synchronous generator. This paper focused on the condition monitoring of rotating rectifier diodes in brushless exciter. Two common types of diode failures such as diode open-circuit and diode short-circuit on the one branch of rotating rectifier are simulated during no load and full load conditions. All accessible signals of main generator and exciter are analyzed by FFT method. In the end best signals for detection fault condition are introduced and suitable criteria to distinguish between diode failures are presented.

[1]  Hideo Yamashita,et al.  Computer simulation of a three-phase brushless self-excited synchronous generator , 1999 .

[2]  J. Penman,et al.  The detection of stator and rotor winding short circuits in synchronous generators by analysing excitation current harmonics , 1996 .

[3]  Abdelkader Chaari,et al.  Detection of brushless exciter rotating diodes failures by spectral analysis of main output voltage , 2013, 2013 International Conference on Electrical Engineering and Software Applications.

[4]  P. Kundur,et al.  Power system stability and control , 1994 .

[5]  Chang Xu,et al.  A neural network based approach for the detection of faults in the brushless excitation of a synchronous motor , 2009, 2009 IEEE International Conference on Electro/Information Technology.

[6]  Changshu Zhan,et al.  System Stability and Control Strategy of Electric Power Steering , 2015 .

[7]  I. E. Chabu,et al.  Studies on electrical stresses in rotating rectifiers for brushless exciters , 2010, 2010 9th IEEE/IAS International Conference on Industry Applications - INDUSCON 2010.

[8]  D.J. Morrow,et al.  Noninvasive detection of brushless exciter rotating diode failure , 2004, IEEE Transactions on Energy Conversion.

[9]  Peter Tavner,et al.  Condition monitoring of electrical machines , 1987 .

[10]  Peter W. Sauer,et al.  Power System Dynamics and Stability , 1997 .

[11]  Woonki Na.  A feedforward controller for a brushless excitation system during the diode open circuit fault operation , 2011, 2011 IEEE Power and Energy Society General Meeting.

[12]  J. Machowski.  Power System Dynamics And Stability , 1997 .

[13]  S.D. Sudhoff,et al.  A brushless exciter model incorporating multiple rectifier modes and Preisach's hysteresis theory , 2006, IEEE Transactions on Energy Conversion.

[14]  Abdelkader Chaari,et al.  Brushless Three-Phase Synchronous Generator Under Rotating Diode Failure Conditions , 2014, IEEE Transactions on Energy Conversion.

[15]  Y. H. Ku,et al.  Electric Power System Dynamics , 1983 .

[16]  Tian Mingxing,et al.  Harmonic analysis of the exciter's exciting current of a brushless AC generator with a rotary rectifier , 2004, The 4th International Power Electronics and Motion Control Conference, 2004. IPEMC 2004..

[17]  F.C. Trutt,et al.  Condition monitoring of brushless three-phase synchronous generators with stator winding or rotor circuit deterioration , 2001, Conference Record of the 2001 IEEE Industry Applications Conference. 36th IAS Annual Meeting (Cat. No.01CH37248).