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单级式隔离型三相双向AC/DC变换器及其SVPWM调制策略

DOI: 10.13334/j.0258-8013.pcsee.2015.15.018, PP. 3886-3894

Keywords: 双向AC/DC变换器,空间矢量脉宽调制,高频电气隔离,三相逆变器,直流微网

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Abstract:

为了同时实现升降压AC/DC变换和高功率因数控制,提出一种单级式隔离型三相双向AC/DC变换器及其改进型空间矢量脉宽调制(spacevectorpulsewidthmodulation,SVPWM)策略。该拓扑具有功率因数高、升降压输出、高频电气隔离以及电能双向流动的优点,适合作为380V直流微网与电网之间的接口变换器。它与传统的三相电压型脉宽调制整流器相比,不需要外加工频变压器或者DC/DC降压变换环节,具有功率密度更高、成本更低的优点。给出变换器的推导过程以及工作原理,提出基于该拓扑的SVPWM调制策略,并分析变换器的直通问题。最后,在实验室研制一台由DSPTMS320F2812控制的3kW原理样机,实验结果验证了所提出的拓扑及其SVPWM算法的可行性。

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