Motor Stator Insulation Stress Due to Multilevel Inverter Voltage Output Levels and Power Quality
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...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-06-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/15/11/4091 |
| _version_ | 1827665161096265728 |
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| author | Arshiah Yusuf Mirza Ali Bazzi Hiep Hoang Nguyen Yang Cao |
| author_facet | Arshiah Yusuf Mirza Ali Bazzi Hiep Hoang Nguyen Yang Cao |
| author_sort | Arshiah Yusuf Mirza |
| collection | DOAJ |
| description | 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 <i>dv</i>/<i>dt</i> 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. |
| first_indexed | 2024-03-10T01:20:34Z |
| format | Article |
| id | doaj.art-0336a134ccb1440c923d86e548982bc7 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-10T01:20:34Z |
| publishDate | 2022-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-0336a134ccb1440c923d86e548982bc72023-11-23T14:00:13ZengMDPI AGEnergies1996-10732022-06-011511409110.3390/en15114091Motor Stator Insulation Stress Due to Multilevel Inverter Voltage Output Levels and Power QualityArshiah Yusuf Mirza0Ali Bazzi1Hiep Hoang Nguyen2Yang Cao3Electrical and Computer Engineering, University of Connecticut, Storrs, CT 06269, USAElectrical and Computer Engineering, University of Connecticut, Storrs, CT 06269, USAElectrical and Computer Engineering, University of Connecticut, Storrs, CT 06269, USAElectrical and Computer Engineering, University of Connecticut, Storrs, CT 06269, USAMultilevel 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 <i>dv</i>/<i>dt</i> 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.https://www.mdpi.com/1996-1073/15/11/4091multilevel inverters3-level5-level7-levelvoltage<i>dv</i>/<i>dt</i> |
| spellingShingle | Arshiah Yusuf Mirza Ali Bazzi Hiep Hoang Nguyen Yang Cao Motor Stator Insulation Stress Due to Multilevel Inverter Voltage Output Levels and Power Quality Energies multilevel inverters 3-level 5-level 7-level voltage <i>dv</i>/<i>dt</i> |
| title | Motor Stator Insulation Stress Due to Multilevel Inverter Voltage Output Levels and Power Quality |
| title_full | Motor Stator Insulation Stress Due to Multilevel Inverter Voltage Output Levels and Power Quality |
| title_fullStr | Motor Stator Insulation Stress Due to Multilevel Inverter Voltage Output Levels and Power Quality |
| title_full_unstemmed | Motor Stator Insulation Stress Due to Multilevel Inverter Voltage Output Levels and Power Quality |
| title_short | Motor Stator Insulation Stress Due to Multilevel Inverter Voltage Output Levels and Power Quality |
| title_sort | motor stator insulation stress due to multilevel inverter voltage output levels and power quality |
| topic | multilevel inverters 3-level 5-level 7-level voltage <i>dv</i>/<i>dt</i> |
| url | https://www.mdpi.com/1996-1073/15/11/4091 |
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