Abstract
This paper proposes strategies to share the energy handled by the series and parallel converters, which compose a single-phase line-interactive UPS system. Thus, the overall amount of active and non-active (reactive and harmonic) power processed by the PWM converters can be optimized when the UPS operates in backup-mode. Based on the functioning of the presented line-interactive UPS system, in standby operation mode, the powers processed by the series and parallel converters are lower than those demanded by the load, such that both converters operate underload. On the other hand, in backup-mode, the series converter is inhibited, while the parallel converter remains feeding the load. In other words, the parallel converter must be sized to provide all the power demanded by the load. It can be highlighted that by employing the strategies proposed in this paper, the series converter is not inhibited in backup-mode. Therefore, the power compensation algorithms predict an effective power sharing between the converters based on the amount of energy demanded by the load. As a result, the sizing of the parallel converter can be optimized, since its nominal VA power rate decreases and does not need to be equal to that demanded by the load. Simulation results are performed in order to present the effectiveness of the proposed power sharing compensation strategies.
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