Modeling and Control of a Three Phase Voltage Source Inverter with an LCL Filter by Aratrik Sarkar A Thesis Master of Science ARIZONA STATE UNIVERSITY May 2015

Modeling and Control of a Three Phase Voltage Source Inverter with an LCL Filter by Aratrik Sarkar A Thesis Presented in Partial Fulfillment of the Requirements for the Degree Master of Science ARIZONA STATE UNIVERSITY May 2015

ABSTRACT
This thesis addresses the design and control of three phase inverters. Such inverters are used to produce three-phase sinusoidal voltages and currents from a DC source. They are critical for injecting power from renewable energy sources into the grid. This is especially true since many of these sources of energy are DC sources (e.g. solar photovoltaic) or need to be stored in DC batteries because they are intermittent (e.g. wind and solar). Two classes of inverters are examined in this thesis. A control-centric design procedure is presented for each class. The first class of inverters is simple in that they consist of three decoupled subsystems. Such inverters are characterized by no mutual inductance between the three phases. As such, no multivariable coupling is present and decentralized single-input single-output (SISO) control theory suffices to generate acceptable control designs. For this class of inverters several families of controllers are addressed in order to examine command following as well as input disturbance and noise attenuation specifications. The goal here is to illuminate fundamental tradeoffs. Such tradeoffs include an improvement in the in-band command following and output disturbance attenuation versus a deterioration in out-of-band noise attenuation. A fundamental deficiency associated with such inverters is their large size. This can be remedied by designing a smaller core. This naturally leads to the second class of inverters considered in this work. These inverters are characterized by significant mutual inductances and multivariable coupling. As such, SISO control theory is generally not adequate and multiple-input multiple-output (MIMO) theory becomes essential for controlling these inverters.
LINK COMPLETE THESIS
https://repository.asu.edu/attachments/150811/content/Sarkar_asu_0010N_15085.pdf

Circuit Systems with MATLAB and PSpice Por Won Y. Yang,Seung C. Lee

Study on the Voltage Balancing Inverter for UPS Byeon, Yong Seop Department of Electrical Engineering Graduate School, Myongji University

Electronic Engineering (Constant Voltage Circuit) - Provided by Kim, Gyun Nam (Korea Institute of Science & Technology)

Electronic Engineering (Constant Voltage Circuit) - Provided by Kim, Gyun Nam (Korea Institute of Science & Technology)- 전자공학(정전압회로) - 김기남공학원 제공(방송기술직, 공기업 공채전문 학원)

Analysis and Design of High Frequency Gapped Transformers and Planar Transformers in LLC Resonant Converters by Jun Zhang B.E. and M.S., Zhejiang University, China -School of Electrical and Electronic Engineering College of Engineering and Informatics National University of Ireland, Galway

Analysis and Design of High Frequency Gapped Transformers and Planar Transformers in LLC Resonant Converters by Jun Zhang B.E. and M.S., Zhejiang University, China
in fulfilment of the requirements for the degree of Doctor of Philosophy in the subject of Electrical and Electronic Engineering.

Abstract
The LLC resonant converter is particularly applicable for power supplies applications since soft switching is easily achieved. The dual objectives in power supply are higher switching frequencies and higher power densities. The analysis and design of the LLC resonant converter, especially the magnetic components needs further investigation and the related research has enormous practical significance. In this thesis, the design methodology for the LLC resonant converter is proposed based on the circuit analysis and the loss calculations with soft switching conditions and input voltage variations considered. The gapped transformer employed in the resonant converter is deeply investigated. The transformer was treated as the multiwinding inductor and a new design methodology is proposed. The parasitic parameters in the transformer involving high frequency leakage inductance and stray capacitance are studied, and reliable evaluation formulas are presented. With the purpose of introducing the planar transformer in the LLC resonant converter, the detailed modelling of planar transformer including the winding loss calculation, the stray capacitance and the leakage inductance for the integrated planar structure incorporating the low permeability magnetic shunt is carried out. Combing the analytical results of the gapped transformer design method and modelling of the planar transformer, the gapped planar transformer for the LLC resonant converter is designed and fabricated. Comparison with the conventional transformer shows that successful operation is possible with the low profile core.

LINK COMPLETE THESIS
https://aran.library.nuigalway.ie/bitstream/handle/10379/5048/Thesis_Jun.pdf?sequence=1&isAllowed=y