Abstract

AbstractThis paper presents an effective PWM method for power conversion circuits. The proposed method is called Vector Frequency Modulation (VFM) in this paper. VFM is different from conventional PWM methods. Although VFM is based on the concept of the space voltage vector, all necessary calculations of the periods of the voltage vectors can be performed without using traditional equations. The voltage vectors are classified into two groups, zero vectors and nonzero vectors. Instead of the complicated equations, a very simple algorithm is employed in VFM. One vector period is fixed and the zero vectors are distributed among the nonzero vectors in the ratio determined by the command voltage or frequency. The action of VFM is performed in software, and no modulation‐wave oscillators, comparators, and up‐down counters are needed.First, a reversible chopper is modulated by VFM and a 2‐kW DC motor is driven by the chopper. The motor speed is regulated by modern control theory. Next, a three‐phase inverter is modulated by VFM and a 2.2‐kW induction motor is driven by the inverter. Experimental results are presented to demonstrate that VFM is useful for power conversion circuits. © 2010 Wiley Periodicals, Inc. Electr Eng Jpn, 174(1): 59–68, 2011; Published online in Wiley Online Library (wileyonlinelibrary.com). DOI 10.1002/eej.20982

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.