研究目的
To analyze the resonance instability phenomenon found during tests of a photovoltaic charging station and to evaluate and quantify the power quality of charging stations.
研究成果
The resonance instability phenomenon in photovoltaic charging stations is analyzed, showing that the phase-locked loop (PLL) bandwidth and control parameters of the current loop significantly affect the output admittance of the inverter. Adjusting these parameters can prevent the inverter-grid system from being unstable at certain resonant frequencies. Two improvement methods are suggested: connecting a low pass filter or reducing the control bandwidth, both of which can significantly improve system stability.
研究不足
The study is limited by the specific conditions of the PV charging station tested and the control methods analyzed. The applicability of the findings to other systems or control methods may require further validation.
1：Experimental Design and Method Selection:
The study involves in-situ comparative analysis and power quality tests of a photovoltaic charging system for e-bikes. Two current control methods (proportional resonance and synchronous rotating frames) are modeled and tested under different conditions.
2：Sample Selection and Data Sources:
The PV charging station for e-bikes at the campus of the University of Twente is used, with measurements taken from current and voltage sensors installed at various points.
3：List of Experimental Equipment and Materials:
Includes commercially available components such as 275 Wp of Canadian Solar? PV modules and a 2.0 kW inverter SOLAX Power? X1 Series.
4：0 kW inverter SOLAX Power? X1 Series.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The system is analyzed analytically in the time domain and in the frequency domain by simulation. The passivity impedance-based stability criterion is applied to analyze resonance instability.
5：Data Analysis Methods:
The stability of the inverter-grid system is analyzed using the Nyquist criterion and passivity theory.
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