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This paper proposes a hierarchical control structure that allows the thermal equalization among the DC-link capacitors of UPSs connected in parallel. The electrolytic capacitors typically used in DC-links are one of the main causes of failure in electronic equipment and the lifetime of this component is sensitive to high operating temperatures. In this sense, this work proposes the addition of a control loop with the objective to increase the lifetime of uninterruptible power systems. Through the estimation of the UPS’s internal temperatures, the proposed control loop manages the active power that each UPS unit must provide to equalize the DC-link capacitors temperatures. Hardwarein-the-loop results are acquired considering two 10 kVA single-phase UPSs connected in parallel and located in places with different temperatures, proving the good performance and the feasibility of the proposal.

Estrutura de Controle Hierárquico para o Paralelismo de UPS de Dupla Conversão com Equalização das Temperaturas dos Capacitores dos Barramentos CC