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http://dx.doi.org/10.6113/TKPE.2011.16.3.283

Single Phase 5-level Inverter with DC-link Switches  

Choi, Young-Tae (영진전문대학 신재생에너지전기계열)
Sun, Ho-Dong (경북대 대학원 전자전기컴퓨터학부)
Park, Min-Young ((주)LG전자 AC제어연구소)
Kim, Heung-Geun (경북대 IT대학 전기공학과)
Chun, Tea-Won (울산대 전기전자정보시스템공학부)
Nho, Eui-Cheol (부경대 전기공학과)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.16, no.3, 2011 , pp. 283-292 More about this Journal
Abstract
This paper proposed a new multi-level inverter topology based on a H-bridge with two switches and two diodes connected to the DC-link. The output voltage of the proposed topology is quite closer to a sinusoidal waveform compared with a typical single phase inverter. The proposed multi-level inverter is applicable to a power conditioning system for renewable energy sources, and it can be also used as a building block of a cascaded multi-level inverter for a high voltage application. In case of conventional H-bridge type or NPC type multi-level inverter, 8 controllable switches are used to obtain a 5 level output voltage, but the proposed multi-level inverter requires only 6 controllable switches. Thus the circuit configuration is quite simple, reliable and cost-effective implementation is possible. The efficiency can be improved owing to the reduction of the switching loss. A new PWM method based on POD modulation is suggested which requires only one carrier signal. The switching sequence to make the capacitor voltage balanced is also considered. The feasibility is studied through simulation and experiment.
Keywords
Multi-level inverter; Power conditioning system; Renewable energy sources; PWM strategy; Voltage balancing;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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