Abstract A three-level common-mode voltage eliminated in- verter with single dc supply using flying capacitor inverter and

Transcription

1 , Member, IEEE, Fellow, IEEE, Member, IEEE, Fellow, IEEE Abstract A three-level common-mode voltage eliminated inverter with single dc supply using flying capacitor inverter and cascaded H-bridge has been proposed in this paper. The three phase space vector polygon formed by this configuration and the polygon formed by the common-mode eliminated states have been discussed. The entire system is simulated in Simulink and the results are experimentally verified. This system has an advantage that if one of devices in the H-bridge fails, the system can still be operated as a normal three-level inverter at full power. This inverter has many other advantages like use of single dc supply, making it possible for a back-to-back grid-tied converter application, improved reliability, etc. Index Terms Common-mode voltage elimination, hybrid multilevel inverter, multilevel inverter, three-level inverter. M dvdt dc dc dc

2 dc dc dc dc dc dc dc dc dc dc dc

3 dc dc dc V AO,V BO V CO V CM = (V AO +V BO +V CO )/3.

4 V AO I A V AC1 V AC2 V CM dc dc

5 V AO V AN V NO I A V AO I A V C 1 V C2 V CM V AO V AN V NO I A V AO V AN V NO I A V AO V AN V NO I A dc C dc C +

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7 V AN V C 2 C V CM I A V C 1 CV dc V C 2 CV dc V CM I A IEEE Ind. Electron. Mag. IEEE Trans. Ind. Electron. Proc. IEEE 23rd Annu. Power Electron. Spec. Conf. Proc. IEEE 19th Annu. Power Electron. Spec. Conf. Rec. IEEE Trans. Ind. Appl. Proc. 22nd Annu. IEEE Appl. Power Electron. Conf. Proc. IEEE 37th Power Electron. Spec. Conf. IEEE Trans. Power Electron. IEEE Trans. Power Electron. IEEE Trans. Power Electron. IEEE Trans. Power Electron. IEEE Trans. Power Electron. IEEE Trans. Energy Convers. IEEE Ind. Appl. Mag. IEEE Trans. Power Electron. IEEE Trans. Ind. Appl. Proc. Australasian Univ. Power Eng. Conf. IEEE Trans. Power Electron. IEE Proc. Electr. Power Appl.

8 IEE Proc. Electr. Power Appl. IEEE Trans. Power Electron. IEEE Trans. Power Electron. IEE Proc. Electr. Power Appl. K. Gopakumar P. Roshan Kumar Jose I. Leon P. P. Rajeevan K. Mathew Leopoldo G. Franquelo