A three-phase low-voltage grid-connected current source inverter
Titiz, Furkan Kaan; de Doncker, Rik W. (Thesis advisor); Dieckerhoff, Sibylle (Thesis advisor)
Aachen : ISEA (2019, 2020)
Book, Dissertation / PhD Thesis
In: Aachener Beiträge des ISEA 133
Page(s)/Article-Nr.: 1 Online-Ressource (iv, 128 Seiten) : Illustrationen, Diagramme
Dissertation, Rheinisch-Westfälische Technische Hochschule Aachen, 2019
Even though current source inverters are mainly used in high power applications, for example as electrical drives, they can be an alternative to voltage source inverters for medium and low power applications. In this thesis, a three-phase low voltage grid connected current source inverter having reverse blocking IGBTs is investigated and its analysis, design, simulations, construction and measurements are discussed. First, fundamentals of the used current source inverter including its steady-state behavior are presented. This section is followed by the analysis, which examines the optimization of the DC-link inductor value, filter design, modulation and harmonic analysis and loss distribution. Furthermore, discontinuous conduction mode and modeling with different methods, such as state-space-averaged dq-model are described. Afterwards, simulation environment is illustrated, and the control method and its design are explained. The results cover steady-state and transient behaviors considering some nonideal behavior. In addition to that, simulation results of the low voltage ride through behavior with single, double and three-phase grid faults is given while a PV module is inserted as an input source. Finally, as a proof-of-concept, realized protype setup is discussed and experimental results are demonstrated for the validation of steady-state and transient cases. Evaluation of the simulation and experimental results including calculated and measured efficiency values conclude the work.