| 摘要 |
<P>PROBLEM TO BE SOLVED: To establish a technology for reducing noise level by setting delay time or carrier phase angle that is not based on harmonics n, relating to a noise reduction method of a power conversion system in which a plurality of power converters are operated in parallel. <P>SOLUTION: In a noise reduction method of a power conversion system in which at least two power converters 200 are operated in parallel, and switching frequencies of the plurality of power converters 200 are synchronized each other, for operation with a proper phase angle, a proper phase angle α is set to be α=(f<SB POS="POST">s</SB>/f<SB POS="POST">l</SB>)×(2 π/N)[rad.], where the number of parallel devices is N, lower limit frequency of the noise specification which should be the base for the power conversion system is f<SB POS="POST">l</SB>, and switching frequency is f<SB POS="POST">s</SB>. <P>COPYRIGHT: (C)2012,JPO&INPIT |
