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多电平逆变器延时叠加SVPWM调制方法的研究与实现
供稿: 郑征;闫飞;邹瑾 时间: 2018-11-26 次数:

作者:郑征;闫飞;邹瑾

作者单位:河南理工大学电气工程与自动化学院希望森兰科技服份有限公司;剑桥大学电力工程系电力电子组

摘要:载波移相SPWM调制方法存在开关损耗大、直流电压利用率低等不足,且不易于和矢量控制、直接转矩控制等高性能的控制系统相结合。SVPWM调制方法因具有直流电压利用率高、动态性能好、易于数字化实现等优点在两电平控制领域得到了广泛的应用,但直接应用于多电平逆变系统由于开关状态过多导致不易实现。采用一种新型的延时叠加SVPWM调制方法,在不增加算法复杂性的前提下,把SVPWM调制方法应用到级联H桥高压变频器系统中,通过Matlab仿真并在实验室380V三单元级联变频器设计项目中对其进行测试,仿真与实验结果有力地证明了这种调制方法的的可行性和正确性。

基金:国家自然科学基金资助项目(61340015);河南省国际合作项目(144300510014);河南理工大学博士基金资助项目(B2012-108);

关键词:高压变频器;直流电压利用率;SVPWM;DSP+FPGA;

DOI:10.16186/j.cnki.1673-9787.2014.01.017

分类号:TM464.23

Abstract:The carrier phase-shifted SPWM modulation method not only has the disadvantages of large switching loss and the poor utilization rate of DC voltage,but also has the poor dynamic performances. This paper puts forward a new type of delay superposition of SVPWM control strategy based on the sample time-staggered thought of carrier phase-shifted SPWM modulation method. This modulation method regards a multilevel system as a combination of two-level systems,which is simple in controlling and easy to realize. In addition,it is successfully applied to a cascaded H-bridge multilevel-inverter system based on DSP + FPGA. The simulation and experimental results show that this method not only solves the problem that SVPWM modulation method is difficult to apply to a multilevel system because of too many synthesis switch states,but also reaches to a high DC voltage utilization ratio with a simple algorithm and a good dynamic performance.

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