Abstract
This paper presents a solar-wind-battery uninterruptible power supply system, which improves reliability issues at the same time that reduces the electric energy bill. The system allows transparent commutation/combination among generators using a DC diode-based OR-gate scheme taking advantage of the renewable-sources nature and avoiding complex synchronization algorithms for the AC regime. The use of a diode-based structure is justified because an efficiency analysis shows that the associated efficiency of the scheme is close to 96%. Given the geographical location, the use of the solar resource is prioritized over other generators, whose operating voltage is therefore adjusted using DC/DC converters. Since a solar panel maximum power voltage is in fact a dynamic parameter, a fuzzy-logic controller is implemented to adjust the DC/DC converters output, which in turn minimizes grid consumption. Testing results show that the controller works properly with high accuracy and precision. Since reliability and grid consumption reduction are targeted, an automatic configuration agent is incorporated to operate the system in one of four predefined states. In tests spanning a complete day with blackout scenarios, the system can provide about 40% more energy to the users with a total grid consumption reduction close to 30%.
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