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http://dx.doi.org/10.5370/KIEE.2017.66.1.40

Small-Signal Modeling and Controller Design of Grid-Connected Inverter for Solid State Transformer  

Kim, Bo-Gyeong (School of Electrical and Computer Engineering, UNIST)
Lee, Jun-Young (School of Electrical and Computer Engineering, UNIST)
Lee, Soon-Sinl (School of Electrical and Computer Engineering, UNIST)
Jung, Jee-Hoon (School of Electrical and Computer Engineering, UNIST)
Publication Information
The Transactions of The Korean Institute of Electrical Engineers / v.66, no.1, 2017 , pp. 40-47 More about this Journal
Abstract
In this paper, a small signal model for grid-connected inverter with unipolar pulse width modulation method is presented. Small-signal analysis allows to predict the stability and dynamics of the inverter. To regulate output voltage and to achieve power factor correction, inverter has two control loops. Loop gains are useful to identify the stability for multi-loop controlled system. Based on small-signal model, controllers are designed to improve audio susceptibility and output impedance characteristics. Proposed small-signal model and controllers are verified by PSIM simulation and experiments.
Keywords
Grid-connected inverter; Small-signal modeling; Controller design; Solid state transformer;
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