Modeling and Bifurcation Analysis for Photovoltaic Single-Sourced Trinary Inverter with Auxiliary Floating Capacitors controlled by Finite-Control-Set Model Predictive Control
- Authors
- Manoharan, M.S.; Ahmed, A.; Park, J.
- Issue Date
- Aug-2021
- Publisher
- Institute of Electrical and Electronics Engineers Inc.
- Keywords
- asymmetric cascaded H-bridge; Bridge circuits; Capacitors; Chaos; chaos operation; finite control set model predictive control; grid-connected; Inverters; photovoltaic; standalone; Switches; Topology; Voltage control
- Citation
- IEEE Journal of Emerging and Selected Topics in Power Electronics, v.9, no.4, pp.5002 - 5015
- Journal Title
- IEEE Journal of Emerging and Selected Topics in Power Electronics
- Volume
- 9
- Number
- 4
- Start Page
- 5002
- End Page
- 5015
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/40671
- DOI
- 10.1109/JESTPE.2020.3036068
- ISSN
- 2168-6777
- Abstract
- Asymmetric cascaded H-bridge (ACHB) trinary inverter has several advantages, such as high efficiency due to high power main H-bridge modulated under a fundamental low frequency, optimal modulation due to non-redundant output voltage levels, and reduction in output filter sizes due to high quality staircase output waveform. However, ACHB inverter requires pre-stage isolated DC sources for the individual H-bridges and has inherent control issues of non-regenerative operation, being incompatible with photovoltaic source. This paper proposes a single-stage, single-sourced ACHB trinary inverter topology without pre-sources. Then, a control strategy using unity horizon length finite control set-model predictive control (FCS-MPC) is proposed to modulate the ACHB inverter. Conventional unity horizon length FCS-MPC has presence of undesirable harmonics and chaos in its variable frequency switching waveform due to the minimum achievable error. Therefore, an exact discrete-time modeling for FCS-MPC is newly derived to show the nonlinear effects of power stage and control parameters in the closed-loop dynamics. And then, a bifurcation analysis based design is proposed to eliminate the undesirable harmonics and chaos operation in the FCS-MPC closed-loop operation. The proposed topology and FCS-MPC controller design is implemented and verified in hardware by using a 2kW prototype for standalone and grid-connected operation. IEEE
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