Abstract ▼ AI-Helper

In medium voltage system, no standard inverter exists to feed induction motors. Various topologies have been introduced to overcome limited voltage capacity of power switching devices which are Neutral Point Clamped(NPC) type, Series type, Flying Capacitor(FC) type. Generally, NPC type and series ty...

In medium voltage system, no standard inverter exists to feed induction motors. Various topologies have been introduced to overcome limited voltage capacity of power switching devices which are Neutral Point Clamped(NPC) type, Series type, Flying Capacitor(FC) type. Generally, NPC type and series type Multi-level drives are the main stream at high voltage and large capacity multi-level inverter drives. I used power module which is NPC type multi-level topology. NPC type Multi-level has advantage of other Multi-level topology. Various multi-level PWM methods have been proposed in this paper. They can be classified into two catalogues, Carrier-based method and space vector PWM method. This paper used the SHPWM which is composed three types method. the three types PWM method are Phase Disposition, Phase Opposition Disposition, Alternative Phase Opposition Disposition. In this paper, I introduce 1 MVA, 6600 V, 9-level voltage source inverter system and describe the main characteristics of inverter system which are NPC type power module, Subharmonic PWM. The multi-level waveform is synthesized by adding each inverter output voltage. and alternative phase opposition disposition method is employed in the new topology.The induction motor operation method is indirect Vector controller which is very simple so a lot of case using indirect Vector controller. The feasibility of the proposed algorithm is studied through the digital simulation and experimental results.

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