研究目的
To propose an integrated methodology for common and differential mode filter design for single phase full-bridge photovoltaic topology with a LCL filter to reduce leakage currents and electromagnetic noise.
研究成果
The proposed methodology for common and differential mode filters design is simple and effective, allowing for the prediction of effects caused in different designs with the same power specifications. It enables the setting of maximum and minimum losses related to common mode filters to ensure the filter is effective without causing a significant impact on the converter efficiency.
研究不足
The methodology may require adjustments based on the specific design specifications and the quality factors (QRd, QRCM) chosen, which can affect the efficiency and effectiveness of the filters.
1：Experimental Design and Method Selection:
The methodology is based on the transfer function of the converter equivalent circuit to reach the design specifications related to the total harmonic distortion of the current injected into the grid (THDiL2), the power factor (PF) at the point of connection to grid and the natural frequency of the filter (ωn).
2：Sample Selection and Data Sources:
The design parameters include the DC bus voltage (VDC), the grid voltage and frequency (vg, fg), the injected apparent power (Sg), the switching frequency of the inverter fsw and the natural frequency of the LCL filter (ωn).
3：List of Experimental Equipment and Materials:
The design involves inductors (L1, L2, LCM), capacitors (Cf, CCM), and resistors (Rd, RCM).
4：Experimental Procedures and Operational Workflow:
The design process involves calculating the grid peak voltage, amplitude modulation index, current ripple, and using these to obtain the LCL filter parameters.
5：Data Analysis Methods:
The methodology includes mathematical modeling using MATLAB symbolic circuit analysis tool (SCAM) to obtain the transfer functions that relate the common and differential mode currents.
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