研究目的
To present a synchronous control strategy for photovoltaic power plants that manages several power converters as an aggregated synchronous system to provide grid frequency and voltage support.
研究成果
The synchronous central controller for PV power plants effectively manages several PV generators as an aggregated system, emulating inertia through several interconnected and coordinated converters. Higher inertia values provide higher frequency support under a perturbation at Pcc, and the automatic power distribution shows how different participation factors distribute the power demanded even when one PV generator achieves its maximum power.
研究不足
The study is based on simulation results, and the practical implementation and performance under real-world conditions are not verified. The control strategy's effectiveness may vary with the scale of the PV power plant and grid conditions.
1:Experimental Design and Method Selection:
The study introduces a Synchronous Central Controller for PV power plants based on the SPC architecture, managing several power converters as a single unit to emulate a sole SG at the point of common coupling (Pcc).
2:Sample Selection and Data Sources:
The simulation setup includes a PV power plant formed by three 2L-VSC connected at Pcc through ac filters and step-up transformers, with the grid simulated using a synchronous generator.
3:List of Experimental Equipment and Materials:
The setup configuration includes dc sources in series connection to a dc resistor to represent the maximum power and the open circuit operation of the PV array.
4:Experimental Procedures and Operational Workflow:
The simulation verifies the power distribution and the grid frequency support of the synchronous central controller under different inertia values.
5:Data Analysis Methods:
The study analyzes the grid frequency response, output power, and load angle at Pcc under inertia emulation, and the current operation and grid synchronization through three-phase voltage, grid current, and converter currents.
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