描述
绝缘栅双极型晶体管(insulated gate bipolar transistor,igbt)被广泛用于各类pwm变流器,如ups、变频器、有源电力滤波器等。随着igbt制造工艺的发展,如今,igbt的额定电流和电压已分别提升到3600a和6500v,由大功率igbt构成的现代化兆瓦级变流器,广泛出现在各类工业应用当中,尤其是近年来,随着新能源发电技术的发展,中大功率igbt得到了更为广泛的应用。随着变流器容量的提升,变流器在整个系统的成本以及可靠性中所占的比重日益增大,因此,兆瓦级变流器的可靠性成为广泛关注的问题。
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