研究目的
To propose and validate a dual-input LLC resonant converter for interfacing a PV panel and a battery energy storage system, aiming to reduce component count, improve efficiency, and achieve soft switching and low voltage stress.
研究成果
The proposed dual-input LLC converter efficiently interfaces PV and battery sources using a shared resonant tank, achieving ZVS in all switches and low voltage stress. It offers a cost-effective and reliable solution for microinverter applications, with simulation results confirming theoretical analysis. Future work includes experimental validation.
研究不足
The study is based on simulation only; experimental validation with a physical prototype is pending and not reported. The topology may have complexity in control strategies for power flow management under varying source conditions.
1：Experimental Design and Method Selection:
The study uses a simulation-based approach in LTspice software to validate the proposed dual-input LLC topology. Theoretical analysis includes mode-by-mode operation scenarios and numerical time-domain analysis due to asymmetry.
2：Sample Selection and Data Sources:
Simulation parameters are defined with PV input voltage range of 25-50 V, battery voltage of 60 V, output voltage of 400 V, and power ratings of 500 W total.
3：List of Experimental Equipment and Materials:
Software: LTspice. Components: Resonant inductor Lr = 4 uH, resonant capacitor Cr = 0.0156 uF, magnetizing inductor Lm = 30 uH, transformer with turn ratio n = 8, active switches (S1-S4), capacitors C1, C2, C
4：0156 uF, magnetizing inductor Lm = 30 uH, transformer with turn ratio n = 8, active switches (S1-S4), capacitors C1, C2, CExperimental Procedures and Operational Workflow:
3.
4. Experimental Procedures and Operational Workflow: Simulations are conducted for different scenarios (e.g., PV charging battery and load, both sources supplying load) with phase-shift PWM control for MPPT and duty cycle control for battery current regulation. Dead time is set to 100 ns.
5：Data Analysis Methods:
Waveforms (e.g., resonant inductor current, magnetizing current, capacitor voltage) are plotted and compared with theoretical predictions to validate operating principles.
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