Interleaving Angle Variation Analysis for Variable Frequency PWM Drives
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Authors
Ashton, Robert W.
Knauff, Michael C.
Dafis, Chris J.
Subjects
variable speed drives
interleaving
stacked phaselegs
harmonic elimination
interleaving
stacked phaselegs
harmonic elimination
Advisors
Date of Issue
2017
Date
Publisher
Language
Abstract
Generally, drive manufacturers include input filters and/or output filters to meet system requirements. Depending on damping, these filters have the potential to introduce resonant conditions. Often the switching frequency changes with the rotational speed of the drive machine leading to the possibility that switching harmonics align with the resonant peak of the filters. As the frequency of the drive decreases, the number of pulses per half cycle of the output fundamental can increase to maintain a reasonably constant switching frequency. For drives that utilize interleaving, another possibility investigated in this paper is to dynamically alter the phase angle between interleaved converters. This allows selective elimination of harmonics near the filter resonance while reducing losses due to a lower switching frequency. Typically, the phase shift is based on the number of system inverters and is used to increase the effective switching frequency. The phase-shifting strategy in this paper differs from the traditional method by targeting specific harmonics of interest. This paperĀ¹ describes the details of implementing strategies to dynamically alter the phase shift between interleaved converters to eliminate harmonics.
Type
Article
Description
Series/Report No
Department
Electrical and Computer Engineering (ECE)
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Naval Surface Warfare Center Philadelphia Division
Funding
Format
5 p.
Citation
Ashton, Robert W., Michael C. Knauff, and Chris J. Dafis. "Interleaving angle variation analysis for variable frequency PWM drives." Electric Ship Technologies Symposium (ESTS), 2017 IEEE. IEEE, 2017.
Distribution Statement
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.