Show/Hide Menu
Hide/Show Apps
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Open Access Guideline
Open Access Guideline
Postgraduate Thesis Guideline
Postgraduate Thesis Guideline
Communities & Collections
Communities & Collections
Help
Help
Frequently Asked Questions
Frequently Asked Questions
Guides
Guides
Thesis submission
Thesis submission
MS without thesis term project submission
MS without thesis term project submission
Publication submission with DOI
Publication submission with DOI
Publication submission
Publication submission
Supporting Information
Supporting Information
General Information
General Information
Copyright, Embargo and License
Copyright, Embargo and License
Contact us
Contact us
DC-link capacitor sizing of three-level neutral point clamped voltage source inverters for variable speed drives
Download
10436182.pdf
Date
2021-12-13
Author
Ogan, Serhat Emir
Metadata
Show full item record
This work is licensed under a
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
.
Item Usage Stats
957
views
419
downloads
Cite This
A three-level neutral point clamped (NPC) voltage source inverter (VSI) topology can be advantageous in electric vehicles with a high DC-link voltage and a high switching frequency due to the flexibility in power switch selection. However, the potential oscillations in neutral point must be handled to guarantee an efficient operation of this topology. A bulky DC-link capacitor is not an option for EV applications; thus, the sizing of the DC-link capacitor considering the traction system characteristics is an important design step. This thesis investigates the effect of PWM modulation methods on the DC-link capacitor size of a three-level neutral point clamped voltage source inverter. Five PWM methods, from which three methods have an active neutral point potential control, are compared in terms of their neutral point potential (NPP) oscillations at various operating conditions. Since the operating conditions in a vehicle traction system depend on the traction motor, the worst-case NPP oscillation condition of each PWM method is determined based on the operation characteristics of a reference electric machine. Then, the size of the DC-link capacitor is determined for each PWM method so that NPP ripple is kept under desired limits under its worst-case operating condition. It is shown that both the modulation technique and the electric machine characteristics are effective on the capacitor size. A 1 kVA prototype three-level neutral point clamped inverter is designed and used to experimentally verify the results of capacitor sizing. Carrier-based PWM method required significantly smaller capacitors than other methods; however, this method had disadvantage of higher switching losses.
Subject Keywords
Three-level Neutral Point Clamped Inverter
,
Capacitor Sizin
,
Electric Vehicle
,
PMaSynRM Drive
,
Neutral Point Potential Ripple
,
Nearest Triangle Vector Method
,
Carrier Based Method
,
Numeric Modeling
,
Printed Circuit Board Design
URI
https://hdl.handle.net/11511/95068
Collections
Graduate School of Natural and Applied Sciences, Thesis
Suggestions
OpenMETU
Core
Performance Analysis, Filter Component Sizing, and Controller Structure Selection of Small Capacitor Diode Rectifier Front End Inverter Drives
Aban, V. Volkan; Hava, Ahmet Masum (2014-09-24)
In this study, the input filter design and dc-bus voltage control of ac motor drives utilizing low capacitance film capacitor are investigated. The dc-bus voltage instability problem arising due to the resonance between the dc-bus capacitor and circuit inductances is explained. A dimensioning algorithm of dc-bus filter components for stable operation is given. The simulation results of the low capacitance motor drives with and without dc-link inductor are provided to observe the stability of the dc-bus at d...
Compatibility Issues Between the Filter and PWM Unit in Three-Phase AC Motor Drives Utilizing the Pure Sine Filter Configuration
Cetin, N. Onur; Hava, Ahmet Masum (2011-11-01)
Inserted between the inverter and the ac motor for the purpose of providing clean sinusoidal voltage at the motor terminals, the pure sine filter (PSF) involves common-mode and differential-mode suppression components. When using PSF in a motor drive and employing advanced pulsewidth modulation (PWM) techniques with discontinuous modulation waveforms, a large common-mode current may circulate through the inverter and the filter resulting in overcurrent stress in the inverter and significant acoustic noise i...
Operation of Three-Phase Power Factor Corrected (PFC) Rectifiers
Mazur, D. (2011-09-10)
Rectifier circuits make a large number of higher harmonics in the mains and lower the power factor (PF). To reduce this harmful effect, rectifier circuits with electronic control are introduced. This article presents two Power Factor Correction rectifier circuits: I- and 3 -phase circuits. We present here the method of controlling these rectifiers, that allows to increase the power factor of these rectifiers. In the article we present also an algorithms, that provide this controlling The simulation results ...
Performance analysis and comparison of reduced common mode voltage PWM and standard PWM techniques for three-phase voltage source inverters
Un, E; Hava, Ahmet Masum (2006-03-23)
This paper investigates the performance characteristics of the reduced common mode voltage (RCMV) PWM methods for three phase voltage source inverters and provides a comparison with the standard PWM methods. PWM methods are reviewed and their pulse patterns and common mode voltage patterns illustrated. The AC output current ripple, DC link input current ripple, and output voltage linearity characteristics of each modulation method are thoroughly investigated by analytical methods and simulations. The analys...
Series active filter design, control, and implementation with a novel load voltage harmonic extraction method
Şentürk, Osman Selçuk; Hava, Ahmet Masum; Department of Electrical and Electronics Engineering (2007)
Series Active Filters (SAF) are designed for harmonic isolation and load voltage regulation of single-phase and three-phase voltage harmonic source type nonlinear loads. The novel Absolute Value Method (AVM) for load voltage harmonic extraction is proposed and applied in the control algorithm of SAF. The SAF compensated systems are represented by simplified linear models such that SAF controller gains can be easily determined. Harmonic isolation and load voltage regulation performances of 2.5 kW single-phas...
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
S. E. Ogan, “DC-link capacitor sizing of three-level neutral point clamped voltage source inverters for variable speed drives,” M.S. - Master of Science, Middle East Technical University, 2021.