研究目的
To present a highly ef?cient, hybrid DC/DC topology for two-stage grid-connected 1500V PV systems using 900V SiC devices, focusing on achieving full ZVS transitions and partial energy processing to improve ef?ciency and energy harvesting capability.
研究成果
The proposed hybrid DC/DC topology achieves high ef?ciency (Euro ef?ciency of 99.48%), full ZVS transitions, and partial energy processing, making it suitable for 1500V PV systems. The simpli?ed Coss model accurately predicts ZVS conditions. Experimental results con?rm the theoretical analysis, with the prototype demonstrating high speci?c power and compact volume. Future work could optimize component arrangement and address low-load operation issues.
研究不足
The topology requires a higher number of switches compared to some alternatives, which may increase complexity and cost. Operation under low loads with AC side inductor con?guration leads to increased switching frequency, potentially requiring additional modulation techniques. The study is speci?c to 1500V PV systems and may not generalize to other voltage levels. Heat sinks are not used in the prototype, limiting thermal management in practical applications.
1：Experimental Design and Method Selection:
The study involves designing a hybrid DC/DC converter combining an interleaved boost stage and a multilevel resonant switched capacitor converter (RSCC). TCM (Triangular Conduction Mode) is used in the boost stage for ZVS, and resonant switching is employed in the RSCC stage. A simpli?ed Coss model is developed for ZVS prediction.
2：Sample Selection and Data Sources:
A 10kW prototype is built and tested. PV string behavior data from a sample location (using 'Canadian Solar CS6X-305P' PV module and environmental measurements from 'LI-200' and 'CR800 MTwr Temp' instruments) is analyzed.
3：List of Experimental Equipment and Materials:
Equipment includes Fluke 8808A multimeters, Fluke TI400 thermal camera, Basys-3 FPGA board for control, and various components like SiC MOSFETs (e.g., C3M0120090J), capacitors (e.g., KEMET ?lm capacitors), inductors (e.g., Ferroxcube cores), and drivers (e.g., CRD-001).
4：1). Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The prototype is tested under nominal and varying conditions (input voltage 650V-1500V, output power up to 10kW). Waveforms, ef?ciency, temperatures, and ZVS conditions are measured. Synchronization of interleaved phases is implemented via FPGA control.
5：Data Analysis Methods:
Ef?ciency is calculated from power measurements. Thermal imaging is used for loss estimation. The simpli?ed Coss model is validated against experimental data for ZVS prediction accuracy.
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Multimeter
8808A
Fluke
Precise measurement of electrical parameters such as voltage, current, and power for loss calculations.
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Thermal Camera
TI400
Fluke
Non-contact temperature measurement of components to estimate losses and verify thermal performance.
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SiC MOSFET
C3M0120090J
Wolfspeed/Cree
Semiconductor switch used in both boost and BRC stages for high-efficiency power conversion with ZVS.
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Solar Irradiance Instrument
LI-200
LI-COR
Measures solar irradiance for environmental data in PV system analysis.
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FPGA Board
Basys-3
Digilent
Implementation of control algorithms for synchronization and switching of the converter phases.
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Film Capacitor
C4AEOBW5140A3JJ
KEMET
Used as input and DC bus capacitors for energy storage and filtering in the converter.
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Inductor Core
PQ32/30
Ferroxcube
Magnetic core for constructing inductors in the boost stage, providing energy storage and filtering.
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Driver
CRD-001
Not specified in paper
Drives the gate of MOSFETs to control switching transitions, ensuring proper operation.
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PV Module
CS6X-305P
Canadian Solar
Source of input power for the system, used in analysis of PV string behavior.
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Temperature Instrument
CR800 MTwr Temp
Campbell Scientific
Measures ambient temperature for environmental data in PV system analysis.
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