2014-15

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PV Powered Performance enhanced three-stage cascaded quasi Z-source inverter fed induction motor drive
(2015-03-23T05:54:14Z) Nisha, K C R; Sanjay, Jain
This paper proposes the use of performance enhanced multi-stage Cascaded quasi Z-source Inverter (CqZSI) topology for adjustable speed drives in Photo Voltaic (PV) applications. For the same boost factor, a new PV powered three-stage CqZSI system has an advantage of lesser shoot-through duty ratio compared to the disadvantage of traditional ZSI with very less boost ratio, increased shoot-through ratio and high component stress at the power switches. A 25% reduction in shoot-through duty cycle is achieved by using the three-stage cascaded solution. The boost factor of the proposed system is 1.5 times higher than single-stage system for the same input voltage. Simulation of the three-stage CqZSI fed induction motor drive is done and verified by experimental results. The performance of the cascaded three-stage qZSI system is compared based on efficiency boost factor and shoot-through performance. This paper illustrates that the performance enhanced CqZSI topology is a good alternative topology for efficient and highly reliable PV power generation system.