Optimal Variable Frequency Soft Switching for Interleaved Grid Tied Inverters in Electric Vehicle Charging Applications
Synchronized variable frequency soft-switching is analyzed and implemented in a 3-phase bidirectional grid-tied inverter. The common-mode connected topology and control allow for independent analysis of a single phase leg before six are combined into two interleaved, 3-phase inverters. Effective ope...
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MDPI AG
2024-12-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/17/23/6077 |
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| author | Youssef A. Fahmy Matthew Jahnes Matthias Preindl |
| author_facet | Youssef A. Fahmy Matthew Jahnes Matthias Preindl |
| author_sort | Youssef A. Fahmy |
| collection | DOAJ |
| description | Synchronized variable frequency soft-switching is analyzed and implemented in a 3-phase bidirectional grid-tied inverter. The common-mode connected topology and control allow for independent analysis of a single phase leg before six are combined into two interleaved, 3-phase inverters. Effective operation is enabled by discretizing the variable switching frequencies before synchronizing them with a control signal. The resulting inverter can operate at any power factor at power levels up to 50 kVA while maintaining zero-voltage switching (ZVS) throughout the grid cycle. Formal conditions for soft-switching and methods for achieving ZVS while maintaining global synchronization are presented. These conditions are then verified in a simulation. Finally, results for different power factors with and without interleaving are demonstrated in a prototype that achieves >98.1% efficiency when converting all real power. |
| format | Article |
| id | doaj-art-0c67a770f7f44a71b0cb1d929beac2ca |
| institution | Kabale University |
| issn | 1996-1073 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj-art-0c67a770f7f44a71b0cb1d929beac2ca2024-12-13T16:25:59ZengMDPI AGEnergies1996-10732024-12-011723607710.3390/en17236077Optimal Variable Frequency Soft Switching for Interleaved Grid Tied Inverters in Electric Vehicle Charging ApplicationsYoussef A. Fahmy0Matthew Jahnes1Matthias Preindl2Department of Electrical Engineering, Columbia University in the City of New York, New York, NY 10027, USADepartment of Electrical Engineering, Columbia University in the City of New York, New York, NY 10027, USADepartment of Electrical Engineering, Columbia University in the City of New York, New York, NY 10027, USASynchronized variable frequency soft-switching is analyzed and implemented in a 3-phase bidirectional grid-tied inverter. The common-mode connected topology and control allow for independent analysis of a single phase leg before six are combined into two interleaved, 3-phase inverters. Effective operation is enabled by discretizing the variable switching frequencies before synchronizing them with a control signal. The resulting inverter can operate at any power factor at power levels up to 50 kVA while maintaining zero-voltage switching (ZVS) throughout the grid cycle. Formal conditions for soft-switching and methods for achieving ZVS while maintaining global synchronization are presented. These conditions are then verified in a simulation. Finally, results for different power factors with and without interleaving are demonstrated in a prototype that achieves >98.1% efficiency when converting all real power.https://www.mdpi.com/1996-1073/17/23/6077EV charginggrid-tied inverterspulse width modulation converterssoft-switchingtransportation electrification |
| spellingShingle | Youssef A. Fahmy Matthew Jahnes Matthias Preindl Optimal Variable Frequency Soft Switching for Interleaved Grid Tied Inverters in Electric Vehicle Charging Applications Energies EV charging grid-tied inverters pulse width modulation converters soft-switching transportation electrification |
| title | Optimal Variable Frequency Soft Switching for Interleaved Grid Tied Inverters in Electric Vehicle Charging Applications |
| title_full | Optimal Variable Frequency Soft Switching for Interleaved Grid Tied Inverters in Electric Vehicle Charging Applications |
| title_fullStr | Optimal Variable Frequency Soft Switching for Interleaved Grid Tied Inverters in Electric Vehicle Charging Applications |
| title_full_unstemmed | Optimal Variable Frequency Soft Switching for Interleaved Grid Tied Inverters in Electric Vehicle Charging Applications |
| title_short | Optimal Variable Frequency Soft Switching for Interleaved Grid Tied Inverters in Electric Vehicle Charging Applications |
| title_sort | optimal variable frequency soft switching for interleaved grid tied inverters in electric vehicle charging applications |
| topic | EV charging grid-tied inverters pulse width modulation converters soft-switching transportation electrification |
| url | https://www.mdpi.com/1996-1073/17/23/6077 |
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