Modified modulation techniques for quasi-Z-source cascaded H-bridge inverters
- Authors: Miceli, R.; Schettino, G.; Viola, F.; Blaabjerg, F.; Yang, Y.
- Publication year: 2018
- Type: Contributo in atti di convegno pubblicato in volume
- Key words: Harmonics; Modulation techniques; PV systems; Quasi-Z source cascaded H-Bridge inverters; Energy Engineering and Power Technology; Electrical and Electronic Engineering; Industrial and Manufacturing Engineering; Control and Optimization
- OA Link: http://hdl.handle.net/10447/344175
Abstract
Quasi-Z-source cascaded H-bridge (q Z S - C H B) inverters are one promising solution for high power photovoltaic (PV) systems. This type of topologies inherits the advantages of cascaded converters (i.e., multilevel outputs) and impedance-source inverters (i.e., high conversion ratios). In addition, it allows increasing the inverter reliability (with high redundancy). However, the modulation and control of qZS-CHB inverters are challenging to a certain extent. Thus, this paper proposes modified modulation techniques to increase the performances of qZS-CHB converters in terms of voltage gains and stresses. The novelty lies in the use of the switching frequency optimal as reference signals in the modulation techniques. A comparison in terms of harmonics with selected modulation techniques is performed.