Comparative Analysis of Inverter Topology to Drive Four AC Loads

Author Name(s): Damini Shingne, Gaurav Goyal
Author Email: goyalg@rknec.edu

Abstract

There are various inverter topologies to drive a multiple AC load. Two different compact and cost-effective reduced switch count (RSC) inverter topologies are analysed in this paper. These topologies are capable to drive four ac loads and generating the twelve phase output voltage from a single common DC bus. In these topologies less number of switches are required than the conventional inverter. Both fifteen switch inverter topologies are realized by Carrier- based pulse width modulation technique. In this paper the comparative analysis of both Fifteen Switch Inverter topologies are presented.

Introduction

The term inverter has been mostly used in DC/AC converters for controlling voltage and frequency of AC loads. There are many industrial applications [1-5] requires a large number of motors for manipulating the robots, Hybrid electric vehicle (HEV), Electric vehicle (EV). Many electrical systems insets more than one load which requires the independent control. The conventional solution for such a problem is to use a single six-switch inverter for each load. Such uses of separate inverters increase the cost and the volume of the system. Multioutput reduced-switch-count inverter is the conventional solution to overcome this problem. In the existing system the Five-leg inverter (FLI) [6-8] consisting of ten switches and the nine switch inverter (NSI) are used to drive two three-phase loads [9]. A lot of work is done to reduce the number of switching per period and therefore the switching losses. Proposed generalized PWM strategy reduces the power loss by reducing the total number of switching in each switching cycle for both common frequency (CF) and variable frequency (VF) modes. Conventionally for driving four three-phase loads, twenty- four switches are required and because of it the switching losses get increased also the size and the cost get increased. To overcome this problem the new fifteen switch inverter topologies are introduced in [10 & 11]. These two topologies are control by using the conventional SPWM technique.

Conclusion

In this paper, two different topologies named fifteen switch inverter capable to drive four ac loads has been analysed through simulation. In both the topologies the, fifteen semiconductor switches are used to produce four sets of three phase outputs. In fifteen switch inverter proposed in [10] total seven switches are common whereas in fifteen switch inverter proposed in [11] total nine switches are in common for generating sub inverter Inv1, Inv2, Inv3 & Inv4. The simulation analysis shows that at modulation index 0.25 and common frequency mode both the inverters give the same result. Thus it is concluded that at CF mode both the inverters works in same manner

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