研究目的
To verify the feasibility of decentralized control scheme in the three-phase AC-stacked PV inverter system and mitigate unbalanced output power caused by asymmetrical irradiance conditions.
研究成果
The proposed three-phase AC-stacked PV inverter architecture with decentralized control and output balancing strategy is feasible and effective in mitigating unbalanced output power under asymmetrical irradiance conditions, as demonstrated by CHIL test results showing reduced neutral current and balanced phase currents.
研究不足
Limitations include the use of a reduced number of modular inverters in the CHIL test due to simulator constraints (e.g., only seven modular inverters used instead of the full set for real applications), and the need for optimization of droop gain for better control performance.
1：Experimental Design and Method Selection:
The study uses a controller hardware-in-the-loop (CHIL) test to verify the proposed three-phase AC-stacked PV inverter architecture and its decentralized output balancing control strategy. The design includes a real-time power electronics simulator and a microcontroller for implementation.
2：Sample Selection and Data Sources:
The test bench includes PV panels (
3：1 W and 5 VDC at MPP under 1000W/m2 irradiance) and Li-ion batteries (800 Wh and 40 VDC). Data is generated from simulations under symmetrical and asymmetrical irradiance conditions. List of Experimental Equipment and Materials:
2 Real-time power electronics simulator (Typhoon HIL 602), microcontroller (TMS320F28335), PV panels, batteries, sensors for AC string current and neutral current.
4：Experimental Procedures and Operational Workflow:
The CHIL test involves setting up the simulator and controller, applying irradiance changes (e.g., from 1000 W/m2 to 500 W/m2), measuring currents and voltages, and implementing the output balancing control with PR controller-based harmonics filter.
5：Data Analysis Methods:
Analysis of transient and steady-state responses, measurement of neutral current reduction, and verification of control effectiveness through graphical results.
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