| With the development of power-electronic techniques, the classical technique for excitation system of synchronous generator has been broken by the success in the brushless type DC system. A kind of polyphase brushless exciter which has better property came into the world in recent years. Scholars has simulation and experiment on it' s operating condition. But the research on harmonic problems has not been reported. The author detailly analyse the problems.The distributation of magnetic field in the exciter is decribed in detail in virtue of ANSYS 8.0 software, and inductances of this machine has been solved by the finite element method. By the means of simulation which is based on Kron' s tensor method we have the steady and fault analysis model.In order to analyse the distribution of harmonic components of polyphase brushless exciter, "step by step harmonic eliminate method" is used .which is referenced from the traditional way of harmonic analyse and has better precision. It is proved validity by analyse the harmonic of a DC power supply.The paper analyse the harmonic of 11-phase brushless exciter by means of "step by step harmonic eliminate method" . Lode-voltage, lode-current, phase-voltage and phase-current have been studied. Draw some conclusions from contrast with harmonic regulations of electric power system. It give reference to the design and improvement of this kind of machine. |
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