研究目的
To present a stand-alone dc-bus Electric Vehicle (EV) charging station system using a photovoltaic (PV) source, ensuring the dc bus voltage is maintained at the nominal level under varying operating conditions.
研究成果
The proposed PV-fed EV charging station provides high reliable charging power in a stand-alone dc system. The ESU control scheme effectively regulates the bus voltage under variable solar irradiance and when the power required by EVs exceeds the power generated by the PV panel. The system finds applications in areas where the distribution system is congested and cannot support large numbers of EVs, as well as in remote locations with lack of infrastructure.
研究不足
The study is based on simulation results, and the practical implementation may face challenges such as the need for a larger grid with multiple PV units and EVs for broader applicability.
1：Experimental Design and Method Selection:
The study involves designing a PV-fed dc-bus EV charging station with variable solar irradiance and fast charging standard EV plugged-in. It includes a novel LC filter design to reduce the dc bus current ripple and a control scheme to regulate the bus voltage by using an energy storage unit (ESU).
2：Sample Selection and Data Sources:
The system includes a PV panel, an energy storage unit (ESU), and two EVs. The PV panel consists of 560 modules with 238 m2 total footprint, generating a maximum power Pmpp= 156.8 kW under Standard Test Condition (STC).
3：8 kW under Standard Test Condition (STC).
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: PV panel, boost converter, EV chargers, bi-directional dc-dc converter, battery (or super-capacitor), LC filter.
4：Experimental Procedures and Operational Workflow:
Two different operating scenarios are studied: sun irradiance variation and charging multiple EVs at different rates and time intervals. The system's performance is evaluated in terms of voltage, current, and power at different locations.
5：Data Analysis Methods:
The simulation results are analyzed to confirm the algorithm's effectiveness in regulating the dc bus voltage under varying operating conditions.
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