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Research Article Open access CC BY 4.0

Reliability Evaluation of Rooftop Solar Photovoltaics Using Coherent Threshold Systems

Rudi Uswarman, Ali Muhammad Rushdi

Journal of Engineering Research and Reports · pp. 32–44 · Published 8 Feb 2021

10.9734/jerr/2021/v20i217263

Abstract

The trend for use of rooftop solar photovoltaics (PV) is rising due to their promising economic potential as a source of clean renewable energy. In general, a source of renewable solar energy consists of solar PV, an automatic charge controller, a battery pack, and an inverter. The reliability of a rooftop solar PV system is evaluated herein as that of a coherent threshold system (CTS). First, we utilize the unit-gap method and the fair-power method to verify that a given Boolean function is a threshold one and to identify its threshold and component weights. Both methods utilize specific features of the Karnaugh map (K-map). The unit-gap method uses the map to list all necessary inequalities by inspection, and then reduce them significantly by omitting dominated ones. The fair-power method uses the Karnaugh map to compute Banzhaf indices by appropriate map folding followed by XORing of true cells and false cells.  We evaluate the CTS reliability via a recursive algorithm based on the Boole-Shannon’s expansion in the switching domain, which is transformed via the real transform to the total probability law in the probability domain.

Solar photovoltaics coherent threshold system fair-power method Banzhaf index recursive algorithm.

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