Abstract
In this work, an energy management strategy is proposed for the control of islanded off-grid energy systems with energy storage based on renewable energy sources. The proposed supervisory control framework is based on a hybrid automata algorithm which is combined with propositional-based logic, describing the transitions between different operating states of the integrated system's components. The algorithm can be extended to a variety of cases without compromising the operational objectives. Within the paper, four example cases of application are given. These example cases correspond to different load demands (industrial & residential) as well as different renewable energy sources including solar, wind, hydropower and biomass. In all cases the energy is stored in a combination of batteries and hydrogen (via electrolysis) and then used back in a fuel cell. Compared to the current energy solutions in the example cases based on diesel generation sets, a 95.6%–99.4% curtailment of fossil fuel consumption is achieved. The control algorithm manages to supply power without interruption to the current loads while ensuring the health of the storage components.
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