Journal
IEEE JOURNAL ON EMERGING AND SELECTED TOPICS IN CIRCUITS AND SYSTEMS
Volume 5, Issue 3, Pages 326-335Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JETCAS.2015.2462017
Keywords
Bifurcations; boost converter; constant power load; DC microgrids; nonlinear analysis; sliding mode control
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Funding
- Coordenadoria de Aperfeicoamento de Pessoal de nivel Superior (CAPES), Brazil
- Spanish Ministerio de Ciencia e Innovacion [DPI2013-47293-R]
- MINECO/FEDER Grant [MTM2012-31821]
- Consejeria de Economia, Innovacion, Ciencia y Empleo de la Junta de Andalucia [P12-FQM-1658]
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In this paper the nonlinear dynamics of interconnected power converters in an islanded direct current (DC) microgrid is analyzed. By using a simplified scheme based on two cascaded converters we analyze the dynamical behavior that can arise from the interconnection of these devices on a common DC bus. Furthermore, in order to address the bus voltage control problem, we propose a Sliding Mode Controller for a DC-DC bidirectional power converter to control the DC bus voltage under instantaneous constant power loads. This class of loads introduces a destabilizing nonlinear effect on the converter through an inverse voltage term that can lead to significant oscillations in the DC bus voltage. Simulation results are shown to illustrate the nonlinear analysis.
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