Surveying multi cellular convertors controllers in power systems

Abstract

Multi-cellular convertors have interesting and versatile applications in the field of electricity and power. Two main types of multilevel converters based on floating capacitors include floating capacitor multicellular convertors and stack multi-cell. The first controller shows transient state based on average model and appropriate response and second controller functions based on a Lyapunov function and at the same time controls load currency and capacitor voltage at any Kumutasion (consecutive change) that leads to good performance in stable state. In this paper we design an observer to estimate capacitor voltage according to incorporate behavioral converter. A compound observer is designed based on collecting detailed information from separate switching system modes. Also this paper proposes a method for calculating capacitor voltage stability and load current. Finally, it shows controller effect and observer and proposed model for these three convertor using simulation