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Mitigation of Negative Impedance Instabilities in a DC/DC Buck-Boost Converter with Composite Load
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  • Journal title : Journal of Power Electronics
  • Volume 16, Issue 3,  2016, pp.1046-1055
  • Publisher : The Korean Institute of Power Electronics
  • DOI : 10.6113/JPE.2016.16.3.1046
 Title & Authors
Mitigation of Negative Impedance Instabilities in a DC/DC Buck-Boost Converter with Composite Load
Singh, Suresh; Rathore, Nupur; Fulwani, Deepak;
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A controller to mitigate the destabilizing effect of constant power load (CPL) is proposed for a DC/DC buck-boost converter. The load profile has been considered to be predominantly of CPL type. The negative incremental resistance of the CPL tends to destabilize the feeder system, which may be an input filter or another DC/DC converter. The proposed sliding mode controller aims to ensure system stability under the dominance of CPL. The effectiveness of the controller has been validated through real-time simulation studies and experiments under various operating conditions. The controller has been demonstrated to be robust with respect to variations in supply voltage and load and capable of mitigating instabilities induced by CPL. Furthermore, the controller has been validated using all possible load profiles, which may arise in modern-day DC-distributed power systems.
Composite load;Constant power load;DC/DC buck-boost converter;Negative impedance instabilities;Sliding mode control;Voltage regulation;
 Cited by
Constant Power Loads (CPL) with Microgrids: Problem Definition, Stability Analysis and Compensation Techniques, Energies, 2017, 10, 10, 1656  crossref(new windwow)
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