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This paper presents a three-phase uninterruptable power supply (UPS) based on the high performance Z-source inverter (ZSI). The proposed control strategy is based on two loops. The first loop is dedicated to regulate the dc voltage of the Z-network capacitor and limiting the peak value of the dc link voltage by controlling the shoot-through duty cycle. The second loop employs the instantaneous voltage...
The dynamic voltage restorer (DVR) is considered as the most effective and economic solution for voltage disturbances. This paper presents an energy optimized control scheme for a transformerless DVR. The DVR structure is based on a cascaded H-bridge multilevel inverter topology to eliminate the need of insertion transformers. The proposed control algorithm maintains a balanced load-side voltage even...
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