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Conversion Function Theory of Switching Power Converters
Abstract
Switching Power converters are more prominent and more utilized nowadays than at any other time before; we use power converters for power flow control in large alternating current (AC) grids, for connecting several asynchronous AC networks with high voltage direct current (HVDC) substations, connecting renewable substations such as wind and solar with the transmission system of the main AC-grid, and for the new developing fully electric vehicles (EVs) and all various types of hybrid electric vehicles (HEV) which all consists of several power converters serving one single system.
Modern power converters are switching converters that consist of several fast-switching de-vices. And the increasing penetration of switching power converters such as AC-DC, DC-AC, and DC-DC signifies the complexity of the main AC grid and converter-rich systems modeling and simulation work, which introduces a significant challenge to develop and analyze current networks and grids effectively. In this research, we continue the work on the power conversion functions theory that Professor Mark Ehsani and his Ph.D. assistant Ahmad Bashaireh started many years ago, where they presented a new way to model switching power converters based on the wanted quantity.
In this theory, we rely on the method of referring one side of the converter to the other side based on the wanted quantity, which allows us to simplify the system’s complexity and boosts the simulation speed; By replacing the converter circuit with a set of electrical elements and other modifications to the network, which in turn approximates several connected networks into one single circuit. And in this research, we accurately defined the DC-DC conversion function’s framework and extended it to include non-ideal converters, which significantly increased the simulation accuracy. Moreover, we were able to normalize DC systems using the conversion function theory, in which we can refer any DC system with all DC-DC converters to a base reference where switching converters are rendered transparent to the system. A couple of case studies were provided to demonstrate the efficiency of the proposed theory in reducing the system complexity and boosting the simulation speed up to 3 orders of magnitude faster than the conventional switching topology technique.
Citation
Shawartamimi, Ali (2023). Conversion Function Theory of Switching Power Converters. Master's thesis, Texas A&M University. Available electronically from https : / /hdl .handle .net /1969 .1 /198989.