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Implementation Method of Overmodulation Technique With High Linearity in DSP

선형성이 우수한 과변조 기법의 DSP 구현 방법

  • Kim, Joon-Seok (Dept. of Electronic & Electrical Engineering, University of Dankook) ;
  • Kim, Do-Hyen (Dept. of Electronic & Electrical Engineering, University of Dankook) ;
  • Lee, June-Hee (Propulsion System Lab, Korea Railroad Research Institute) ;
  • Lee, June-Seok (Dept of Electronic & Electrical Engineering, University of Dankook)
  • Received : 2021.11.29
  • Accepted : 2021.12.01
  • Published : 2022.04.20

Abstract

With the aim to maximize the use of a given voltage source in the field of railway and electric vehicles, this study applies a technique for controlling the overmodulation region between the linear and the six-step regions. High linearity overmodulation techniques that do not use look-up table (LUT) to digital signal processor (DSP) using carrier based pulse width modulation (PWM) are proposed. Such technique requires the phase of the voltage vector at the point where the circular trajectory of the voltage command vector and hexagonal cross each other. Therefore, a method is proposed to obtain a phase of a voltage vector that is derived through an equation and applied to a carrier-based PWM. Validity of the proposed implementation method is confirmed through simulation and experiment.

Keywords

Acknowledgement

본 연구는 국토교통부 및 국토교통과학기술진흥원에서 지원하는 철도기술연구사업(과제번호: 22RTRP-C146008-05)과 정부(과학기술정보통신부)의 재원(과제번호: 2020R1G1A1100297)으로 한국연구재단의 지원을 받아 수행되었습니다.

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