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This paper presents a fault detection method for open-circuit faults of a switching device in neutral-point-clamped inverter systems, which is based on the inherent characteristic of continuous pulsewidth modulation. The proposed method is achieved by measuring the pole voltage and its duration time. The pole voltage includes information of switching states in the inverter system but not affected...
Three-level Diode Clamped Multilevel Inverter, generally known as Neutral-Point-Clamped (NPC) Inverter, has an inherent problem causing Neutral Point (NP) potential variation. Until now, in many literatures NP potential problem has been investigated and lots of solutions have also been proposed. However, in the cases of fault and fault tolerant control state, distinctive feature of NP potential variation...
This paper presents a new fault detection scheme for voltage fed inverter to improve the reliability of power electronic system, which is of paramount importance in industrial, commercial, aerospace, rolling mill and military applications. The proposed method is achieved by using voltage of lower switches in each phase under the inverter fault condition. The reconfiguration method is achieved by the...
In order to achieve the good load sharing performance in parallel operation of a three-phase UPS inverter system, this paper describes a control method with an inverter current feed-forward compensator including design criteria for choosing the feed-forward gain. Especially, this paper discussed about the harmonic circulating current due to PWM non-synchronization which disturbs the precision of load...
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...
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