Mitigation of Negative Impedance Instabilities in a DC/DC Buck-Boost Converter with Composite Load

Suresh Singh; Nupur Rathore; Deepak Fulwani

Mitigation of Negative Impedance Instabilities in a DC/DC Buck-Boost Converter with Composite Load

Suresh Singh

Nupur Rathore

Deepak Fulwani

Vol. 16, No. 3, pp. 1046-1055, May 2016

10.6113/JPE.2016.16.3.1046

Composite load

Constant power load

DC/DC buck?boost converter

Negative impedance instabilities

Sliding mode control

Voltage regulation

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Abstract

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.

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Cite this article

[IEEE Style]

S. Singh, N. Rathore, D. Fulwani, "Mitigation of Negative Impedance Instabilities in a DC/DC Buck-Boost Converter with Composite Load," Journal of Power Electronics, vol. 16, no. 3, pp. 1046-1055, 2016. DOI: 10.6113/JPE.2016.16.3.1046.

[ACM Style]

Suresh Singh, Nupur Rathore, and Deepak Fulwani. 2016. Mitigation of Negative Impedance Instabilities in a DC/DC Buck-Boost Converter with Composite Load. Journal of Power Electronics, 16, 3, (2016), 1046-1055. DOI: 10.6113/JPE.2016.16.3.1046.