Abstract
The proposed three-phase boost Current Source Inverter (CSI) is equipped with Reverse-Blocking IGBTs (RB-IGBT) and the Phasor Pulse Width Modulation (PPWM) switching pattern to provide system efficiency greater than 92% and high boost ratios (V <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">LL</sub> /V <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">dc</sub> ) up to 3.5 in a single stage. The boost CSI results in elimination of dc-dc boost converter or a step-up transformer needed in dc-ac converters operating with a dc input voltage lower than the output line-to-line voltage. In this paper, the relationship between the fundamental component of the inverter output current and the PPWM modulation index is derived and then confirmed by simulation and experimentally obtained data in both stand-alone and grid-tied modes of operation. In this work, a 2 kW, 208 V <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">LLrms</sub> , 60 - 120 V <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">dc</sub> RB-IGBT-based boost CSI is prototyped to explore capabilities of the grid-tied boost CSI in terms of efficiency and THD for various input dc voltage and output power levels.
Highlights
The continuous growth in energy demand around the globe and limited availability of fossil fuels along with the increased awareness in the society about the impact of these fossil fuels on the environment has resulted in exploring of renewable energy sources (e.g. photovoltaic (PV) cells, fuel cells, wind turbines, etc.)
The IGBTs used in the boost Current Source Inverter (CSI) are Reverse-Blocking IGBTs (RB-IGBT) from Fuji, i.e. FGW85N60RB
The fundamental and switching frequencies were set to f1 = 60Hz and fs = 3.6kHz, respectively, with M = 10 and NT = 60 in the discretized Phasor Pulse Width Modulation (PPWM)
Summary
The continuous growth in energy demand around the globe and limited availability of fossil fuels along with the increased awareness in the society about the impact of these fossil fuels on the environment has resulted in exploring of renewable energy sources (e.g. photovoltaic (PV) cells, fuel cells, wind turbines, etc.). A maximum efficiency of 83.4% was reported for a boost ratio of 2 (at the line-line output voltage of 220Vrms) and a switching frequency of 8kHz. Anand et al (2014) presented a transformer-less grid-connected CSI with dc-bus capacitors, dc-link inductors, and an extra leg compared to the CSI topology [19]. Anand et al (2014) presented a transformer-less grid-connected CSI with dc-bus capacitors, dc-link inductors, and an extra leg compared to the CSI topology [19] This inverter provided a boost ratio of about 1.33 (at the line-line output voltage of 400Vrms) with a switching frequency of 7.5kHz, and high efficiency of the inverter was only possible without the boost capability.
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