The Phasor PWM (PPWM)-based Current Source Inverter (CSI) is a boost inverter. The difference between conventional CSIs and the boost inverter is that the boost ratio ( / ) in the boost inverter can easily be above 3.0, whereas this ratio is around one in conventional CSIs. In order to realize potential capabilities of the boost inverter and to assist its penetration into renewable energy systems, the boost inverter dynamic behaviors are studied in this paper. First, the large-and small-signal models as well as the -equivalent circuits of the boost inverter are presented. Then, the developed models are verified using circuit simulations and experiments on a laboratory-scale 2kW, 208/240VLLrms, = 65V boost inverter made of reverse-blocking IGBTs (RB-IGBTs). Finally, the developed small-signal model is used to study the stability of the boost inverter through root locus of small signal poles (eigenvalues) as control inputs and load parameters vary within the boost inverter's operating limits.Index Terms -Renewable energy sources, single-stage boost inverter, stability analysis, stand-alone conditions, state-spaceaveraged model.

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Department of Energy (DOE) reports produced after 1991 and a growing number of pre-1991 documents are available free via www.OSTI.gov.

Department of Energy (DOE) reports produced after 1991 and a growing number of pre-1991 documents are available free via www.OSTI.gov.

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 LL /V dc) 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 LLrms , 60 − 120 V dc 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.