Akademik Veri Yönetim Sistemi
Tezin Türü: Yüksek Lisans
Tezin Yürütüldüğü Kurum: Orta Doğu Teknik Üniversitesi, Türkiye
Tezin Onay Tarihi: 2014
Tezin Dili: İngilizce
Öğrenci: Umut Güvengir
Danışman: MUAMMER ERMİŞ
Özet:In this thesis, online selective harmonic elimination method (SHEM) has been applied to a voltage source converter (VSC) based grid-connected three-phase two-level inverter with variable DC link input voltage eliminating 5th, 7th, 11th, 13th, 17th, and 19th harmonics in the output voltage. The switching angles of SHEM are given by a set of nonlinear transcendental equations. Particle swarm optimization (PSO) algorithm is used for the solution of this equation set, and this algorithm is implemented in the field-programmable gate array (FPGA) for a fast and online calculation of switching angles in real time without using a lookup table. FPGA is used as the main and sole controller in the implemented voltage source inverter (VSI) to provide gating signals for IGBTs. In applications where input DC link voltage varies in a wide range, usage of lookup table for switching angle sets might be disadvantageous due to discretization of modulation index values, large lookup table storage, and infeasible region of solution space, which are investigated in detail in the thesis, with explanatory examples. The effects of PSO algorithm parameters on searching performance are also elaborated. FPGA implementation of PSO algorithm for solution of SHEM equation sets is described in detail. A 1.6 kVA, 380 V, three-phase VSI is successfully implemented and tested in the laboratory. Hardware co-simulation, computer simulation, and experimental results have shown that SHEM can be successfully applied online for the control of grid-connected inverters.