Abstract
Multilevel Inverters (MLIs) are widely sought after in medium-voltage applications like electric ships, electric aircraft, and renewable energy integration due to excellent advantages like lower device stress, better power quality, and modularity. However, non-sinusoidal excitations from MLIs pose a serious problem to motor-insulation and lead to their premature breakdown. This paper investigates stress in medium-voltage motor insulation when the stator winding is excited by 3-, 5-, and 7-level multilevel inverter output waveforms. The effect of firing angle on insulation stress is also studied for each of the multilevel inverters. Results show that in addition to the number of output voltage levels, PWM wave shape is a critical factor which affects the insulation stress. Both these factors work together to impact the insulation health. A strong correlation is shown between the increase in the voltage root mean square (RMS) value and increase in dielectric stress when ignoring the dv/dt impact for a fixed DC input voltage and operating frequency of the inverter. Similarly, the dielectric stress in the stator insulation increased with an increase in firing angle for each of the MLIs. This paper shows a potential that both the RMSs can be optimized to reduce the insulation stress and improve the power quality of MLIs in medium voltage drives.
Subject
Energy (miscellaneous),Energy Engineering and Power Technology,Renewable Energy, Sustainability and the Environment,Electrical and Electronic Engineering,Control and Optimization,Engineering (miscellaneous),Building and Construction
Reference19 articles.
1. Multilevel inverters: a survey of topologies, controls, and applications
2. A Review of Multilevel Inverter Topologies, Control Techniques, and Applications;El-Hosainy;Proceedings of the Nineteenth International Middle East Power Systems Conference (MEPCON),2017
3. Online Predictive Maintenance Monitoring Adopting Convolutional Neural Networks
4. Partial Discharge Phase and Amplitude Distribution and Life of Insulation Systems Fed with Multilevel Inverters;Seri;Proceedings of the IEEE Transportation Electrification Conference and Expo (ITEC),2019
5. Partial discharge characteristics in motor insulations under exposure to multi-level inverters;Hammarström;Proceedings of the 2017 IEEE Conference on Electrical Insulation and Dielectric Phenomenon (CEIDP),2017
Cited by
4 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献