Current Source Sepic Multi-level Inverter

Multi-level converters offers benefits of High power level, low switching frequency,reduced output harmonics and better electromagnetic compatibility. with these advantagesit avoids the problem of shortage of modern device technology and It is widely used inhigh-power situations. For the emerging new energy such as wind power, solar power,tidal power, etc. Because they are easily affected by the change of environment, such thatthe input side of the converter is Fluctuation and its output side of the converter must bestable, but Existing multi-level converters are difficult to meet requirements. Developmentof new multi-level converter is important for theoretical and practical significance.Against this background, we refer to a large number of relevant literature, severalkinds of multilevel CIS’s topologies and SEPIC are constructed in high thesis, we presentthe Current source multi-level inverter. It has ability of Step-Up/Step-Down and achievemulti-level.Through the establishment of Current Source SEPIC multi-level converterequivalent model, we analysis the characteristic of Current sharing. For the problem ofcurrent sharing, we present POD-PWM modulation, space vector modulation, and spacevector modulation with current feedback. In order to analysis and identify the cause ofsystem instability, we deduce the mathematical model of the topology and use two newcontrol methods to achieve closed-loop control system.According to theoretical analysis and simulation research, we have designed andproduced a prototype which is one kilo watt, completed experiments on the experimentalplatform and verified the feasibility of the topology.