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The voltage control of flying capacitor is very important for safe operation in flying capacitor multi-level inverter (FCMLI). The voltage unbalancing of flying capacitor causes serious problems in safety and reliability of system, and also limits FCMLI's applications. The voltage unbalancing is occurred due to the difference of each capacitors charging and discharging time applied to FCMLI. This...
This paper describes a high performance voltage controller for 3-phase 4 wire UPS (uninterruptible power supply) system, and proposes a new scheme of synchronous reference frame controller in order to compensate for the voltage distortions due to unbalanced and nonlinear loads. Proposed scheme in this paper is able to completely eliminate the negative sequence voltage distortion due to unbalanced...
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