Power Loss Modeling of Individual IGBT and Advanced Voltage Balancing Scheme for MMC in VSC-HVDC System Gum Tae Son*, Soo Hyoung Lee** and Jung-Wook Park

Power Loss Modeling of Individual IGBT and Advanced Voltage Balancing Scheme for MMC in VSC-HVDC System Gum Tae Son*, Soo Hyoung Lee** and Jung-Wook Park†
Abstract – This paper presents the new power dissipation model of individual switching device in a high-level modular multilevel converter (MMC), which can be mostly used in voltage sourced converter (VSC) based high-voltage direct current (HVDC) system and flexible AC transmission system (FACTS). Also, the voltage balancing method based on sorting algorithm is newly proposed to advance the MMC functionalities by effectively adjusting switching variations of the sub-module (SM). The proposed power dissipation model does not fully calculate the average power dissipation for numerous switching devices in an arm module. Instead, it estimates the power dissipation of every switching element based on the inherent operational principle of SM in MMC. In other words, the power dissipation is computed in every single switching event by using the polynomial curve fitting model with minimum computational efforts and high accuracy, which are required to manage the large number of SMs. After estimating the value of power dissipation, the thermal condition of every switching element is considered in the case of external disturbance. Then, the arm modeling for highlevel MMC and its control scheme is implemented with the electromagnetic transient simulation program. Finally, the case study for applying to the MMC based HVDC system is carried out to select the appropriate insulated-gate bipolar transistor (IGBT) module in a steady-state, as well as to estimate the proper thermal condition of every switching element in a transient state.
LINK
http://www.jeet.or.kr/LTKPSWeb/pub/pubfpfile.aspx?ppseq=1039

Global theory of one-frequency Schrodinger operators

FLEXIBLE HIGH-POWER MULTI DC-DC CONVERTERS FOR TRAINS SYSTEMS ARASH ABBASALIZA BOORA PHD THESIS QUEENSLAND UNIVERSITY OF TECHNOLOGY

FLEXIBLE HIGH-POWER MULTI DC-DC CONVERTERS FOR TRAINS SYSTEMS
ARASH ABBASALIZA BOORA PHD THESIS
QUEENSLAND UNIVERSITY OF TECHNOLOGY AUSTRALIA
LINK
http://eprints.qut.edu.au/33208/1/Arash_Boora_Thesis.pdf

Research, Design and Implementation of Auxiliary Power Supplies APS for the Light Rail Vehicles DMITRI VINNIKOV

Research, Design and Implementation of Auxiliary Power Supplies for the Light Rail Vehicles DMITRI VINNIKOV THESIS ON POWER ENGINEERING, ELECTRICAL ENGINEERING, MINING ENGINEERING D24
 Faculty of Power Engineering Department of Electrical Drives and Power Electronics
 TALLINN UNIVERSITY OF TECHNOLOGY
 Dissertation was accepted for the commencement of the degree of Doctor of Technical Science on October 17, 2005
Introduction
Electric traction is the only present-day solution for environmental problems in the city context. Electric traction is safe, economical, reliable and with a minimum environmental impact. The tram (or LRV, Light Rail Vehicle) is increasingly being seen as a cost-effective, environment-friendly and attractive solution to the urban transport crisis. New demands for energy efficient, reliable and safe rolling stock require purchasing of new vehicles, which is always a bulky financial burden on the rolling stock owner. In many cases, the replacement of entire rolling stock to obtain a new and more efficient technology is not economically feasible. Introduction of new energy saving technologies on old but not yet established own resource trams/LRVs in recent years has become a very attractive approach.
FULL THESIS
http://digi.lib.ttu.ee/archives/2006/2006-07/1153818082.PDF

VISITANDO A FEIRA EMBEDDED SYSTEM CONFERENCE BRAZIL SÃO PAULO-26-27 AGOSTO 2014