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Indirect model predictive control of a three-phase grid-connected Siwakoti-H inverter

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Original languageEnglish
Title of host publicationIECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society
Number of pages6
ISBN (Electronic)978-1-7281-4878-6
ISBN (Print)978-1-7281-4879-3
Publication statusPublished - Oct 2019
Publication typeA4 Article in a conference publication
EventAnnual Conference of the IEEE Industrial Electronics Society -
Duration: 1 Jan 1900 → …

Publication series

NameAnnual Conference of the IEEE Industrial Electronics Society
ISSN (Print)1553-572X
ISSN (Electronic)2577-1647


ConferenceAnnual Conference of the IEEE Industrial Electronics Society
Period1/01/00 → …


The Siwakoti-H flying-capacitor inverter (sFCI) is a potential candidate for photovoltaic applications, specifically for the transformerless grid-connected systems. One of the main challenges in the control of a sFCI is to maintain the flying capacitor voltage within prescribed limits while balancing the voltages on the three flying capacitors. This paper proposes an indirect model predictive control strategy for a three-phase sFCI connected to the grid via an LCL-filter. By linearizing the system model, the nonlinearities introduced due to the dynamics of the flying capacitor are neglected. Moreover, by not directly controlling the switches, but rather manipulating the modulating signal, the optimization problem can be formulated as a quadratic program (QP) and solved in a computationally efficient manner. The explicit solution computed by the controller makes the realtime implementation feasible by employing a carrier-based pulse width modulator (CB-PWM). The presented results illustrate the steady-state and dynamic performance of the controller.

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