Abstract
AbstractTo enhance the robustness and disturbance rejection ability of an on-line uninterruptible power supply (UPS) system, an internal model control (IMC)-based DC-link voltage regulation method is proposed in this chapter. Furthermore, the multi-mode operations of the on-line UPS system are investigated, and their corresponding control strategies are proposed. The proposed control strategies are capable of achieving the seamless transition in traditional normal mode, PV-aided normal mode, enhanced eco-mode, and burn-in test mode. Meanwhile, the uninterruptible load voltage is promised during the mode transition. The small-signal analysis is also conducted to investigate the stability of enhanced eco-mode and burn-in test mode. Finally, extensive experimental results are provided to validate the effectiveness of the proposed methods.KeywordsBurn-in test modeDC-link voltageDisturbance rejectionEnhanced eco-modeInternal model control (IMC)PV-aided normal modeRobustnessSeamless transferUninterruptible power supply (UPS)
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