The activities undertaken under the Mahatma Gandhi National Rural Employment Guarantee Act in Chi... more The activities undertaken under the Mahatma Gandhi National Rural Employment Guarantee Act in Chitradurga district, Karnataka, were assessed for their potential to enhance and provide environmental services. Key programmes implemented in 20 villages during 2009 were studied using rapid scientific assessment methods. An indicator approach was adopted to analyse environmental services such as water for irrigation and improvement in soil quality. The status of environmental services before and after implementation of the activities was examined and vulnerability ...
An NPC‐type fault‐tolerant MLI with symmetrical and asymmetrical voltage modes
International Journal of Circuit Theory and Applications
SummaryCurrent studies have been challenging in reducing the number of devices and ensuring fault... more SummaryCurrent studies have been challenging in reducing the number of devices and ensuring fault tolerance features of the multilevel inverters (MLIs). This article proposes a new fault‐tolerant neutral point clamped (NPC)‐type MLI using two three‐level NPC legs, which can work in symmetric and asymmetric modes to generate nine and 17‐level output voltage, respectively. The proposed converter has less device count and low total blocking voltage (TBV); further, the converter has different redundant switching states for tolerating different categories of faults. This article also implements a modified pulse width modulation (PWM) control strategy to ensure the zero‐dc offset at the output when asymmetrical voltage levels appear with the occurrence of switch faults. A detailed operation of the proposed converter under symmetric and asymmetric modes is presented for healthy and different categories of faults. The converter's feasibility is verified by its current and voltage charac...
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Papers by Balram kumar