研究目的
To present a comparative analysis of non-isolated and isolated type partial-power optimizers for PV-battery series inverter architecture in residential rooftop applications, focusing on system efficiency and power rating based on DC-DC converter topology and battery sizing.
研究成果
The isolated partial-power optimizer (using a DAB converter) is more suitable for the PV-battery series inverter architecture, as it enables lower power rating of the power electronics converter and higher system efficiency by accessing an additional partial-power processing loop and having no static voltage gain limitation, compared to the non-isolated optimizer.
研究不足
The study is limited to residential rooftop applications with PV output power less than 10kW and DC-bus voltage less than 500V. The CHIL tests show slight mismatches in rated power due to system design errors, such as voltage mismatches. The analysis assumes a fixed converter efficiency of 0.975 for both converter types, which may not account for all real-world variations.
1：Experimental Design and Method Selection:
The study involves designing and comparing non-isolated (half-bridge converter) and isolated (dual active bridge converter) bidirectional DC-DC optimizers for a PV-battery series inverter. Theoretical models for partial-power processing rates and efficiency calculations are used.
2：Sample Selection and Data Sources:
A
3：5kW PV generation system with 4V MPP PV strings and three-phase 208VRMS grid is considered, with battery charging and discharging operations from 0 to 5kW. List of Experimental Equipment and Materials:
Includes real-time power electronics simulator (Typhoon HIL 600), microcontroller (TMS320F28335), and components for DC-DC converters.
4：Experimental Procedures and Operational Workflow:
Controller hardware-in-the-loop (CHIL) tests are conducted to verify the operation of the isolated DAB optimizer, with phase-shifted PWM signals for mode switching. Data on voltages and currents are gathered for analysis.
5：Data Analysis Methods:
Rated power and efficiency are calculated based on average voltages and currents from CHIL test results, comparing with theoretical predictions.
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