Abstract
A seamless battery integration with higher power conversion efficiency and lower system power rating can be achieved by adopting the DC-series battery integration topology into a photovoltaic (PV) string inverter system, the PV-battery series inverter. The PV-battery series inverter uses the partial-power processing technique to achieve flexible current control between PV string and battery. In the process of designing the partial-power DC-DC optimizer, different types of DC-DC converters and different size of batteries can be considered, and the system efficiency and the power rating vary based on the system design. This paper presents a comparative analysis of the different type partial-power optimizers for the PV-battery series inverter in residential rooftop applications « 10kW PV output power, < 500V DC-bus voltage), in consideration of the DC-DC converter topology. Non-isolated and isolated bidirectional DC-DC converters are considered and selection of battery voltage in each case is made to have the optimized system design. The operation of the designed DC-DC optimizer is verified through controller hardware-in-the-loop test.
Original language | English |
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Title of host publication | 2018 IEEE Energy Conversion Congress and Exposition, ECCE 2018 |
Publisher | Institute of Electrical and Electronics Engineers Inc. |
Pages | 6207-6213 |
Number of pages | 7 |
ISBN (Electronic) | 9781479973118 |
DOIs | |
State | Published - Dec 3 2018 |
Externally published | Yes |
Event | 10th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2018 - Portland, United States Duration: Sep 23 2018 → Sep 27 2018 |
Publication series
Name | 2018 IEEE Energy Conversion Congress and Exposition, ECCE 2018 |
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Conference
Conference | 10th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2018 |
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Country/Territory | United States |
City | Portland |
Period | 09/23/18 → 09/27/18 |
Funding
ACKNOWLEDGMENT This work is supported by Energy Production and Infrastructure Center (EPIC), Electrical and Computer Engineering Department at the University of North Carolina at Charlotte.
Keywords
- Comparative analysis
- Dc-series PV-battery integration
- Non-isolated and isolated bidireacinal DC-DC converters
- Partial-power DC-DC optimizer
- Pv-battery series inverter
- Residential rooftop PV application