Title :
Analysis of saturated synchronous reactances of large turbine generator by considering cross-magnetizing reactances using finite elements
Author :
Ide, K. ; Wakui, S. ; Shima, K. ; Takahashi, M. ; Miyakawa, K. ; Yagi, Y.
Author_Institution :
Res. Lab., Hitachi Ltd., Ibaraki, Japan
fDate :
3/1/1999 12:00:00 AM
Abstract :
This paper describes a method to calculate saturated reactances of synchronous machines at various loads under steady-state operation by considering influence of cross-magnetizing phenomenon between d- and q-axis circuits. In the method, mutual reactances xdq due to the cross-magnetizing phenomenon can be calculated on the basis of two-dimensional magnetic field analysis. The validity of analysis is shown by good agreement between measured and calculated field current values of a 592 MVA turbine generator at various loads. It is clear that quantitative accuracy requires the magnetic coupling between d- and q-axis circuits be considered. Subsequently, steady-state reactances at various loads are analyzed by considering mutual reactances xdq due to cross-magnetizing phenomenon. The relation between the load angle δ and mutual reactance xdq is clarified, and the difference between equivalent synchronous reactances that are obtained by considering xdq and conventional defined synchronous reactances that do not consider xdq is shown numerically
Keywords :
electric reactance; machine theory; magnetisation; synchronous generators; turbogenerators; 592 MVA; cross-magnetizing phenomenon; cross-magnetizing reactances; d-axis circuits; equivalent synchronous reactance; finite elements; load angle; mutual reactances; q-axis circuits; saturated synchronous reactances; steady-state operation; synchronous machines; turbine generator; two-dimensional magnetic field analysis; Coupling circuits; Equations; Magnetic analysis; Magnetic circuits; Magnetic flux; Saturation magnetization; Steady-state; Synchronous generators; Synchronous machines; Turbines;
Journal_Title :
Energy Conversion, IEEE Transactions on