A Nine Level Inverter Topology with Linear Operation at Over-modulation Region

Pal, S and Majumder, MG and Rakesh, R and Mahapatra, RK and Gopakumar, K and Umanand, L (2020) A Nine Level Inverter Topology with Linear Operation at Over-modulation Region. In: 29th IEEE International Symposium on Industrial Electronics, ISIE 2020, 17-19 June 2020, Delft, Netherlands, pp. 229-234.

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Abstract

This paper discusses a nine level inverter scheme formed by cascading a five level T-type and a H-Bridge unit where all the three phase T-type and HB capacitors can be balanced using pole voltage redundancy. The proposed topology can also operate upto eleven level(pole voltage levels)mode. But at extreme level with conventional carrier based Pulse Width Modulation(PWM) HB capacitor balancing issue limits the operation of the inverter at over modulation range. So a unique PWM scheme is proposed which enables to balance the floating HB capacitors of all the three phases at 11-level mode such a way that the modulation range of the inverter can be increased linearly. Hence the output phase voltage is devoid of any lower order harmonics which are critical for drive application as those harmonics may cause low frequency torque ripple. The feasibility of the proposed inverter scheme is verified under different test condition with extensive simulation studies in MATLAB SIMULINK environment. A hardware prototype is build in the LAB and experimental results are also provided for further validation of the proposed scheme. The increase in linear modulation range is achieved till 0.6248Vdc at unity power factor operation. © 2020 IEEE.

Item Type:	Conference Paper
Publication:	IEEE International Symposium on Industrial Electronics
Publisher:	Institute of Electrical and Electronics Engineers Inc.
Additional Information:	The copyright of this article belongs to Institute of Electrical and Electronics Engineers Inc.
Keywords:	Bridge circuits; Industrial electronics; MATLAB; Poles; Pulse width modulation; Topology; Voltage control, Carrier-based pulsewidth modulations (PWM); Extensive simulations; Hardware prototype; Inverter topologies; Linear modulations; Linear operations; Lower order harmonics; Unity power factor, Electric inverters
Department/Centre:	Division of Electrical Sciences > Electronic Systems Engineering (Formerly Centre for Electronic Design & Technology)
Date Deposited:	01 Sep 2020 11:31
Last Modified:	01 Sep 2020 11:31
URI:	http://eprints.iisc.ac.in/id/eprint/66431

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