Title Virtual Admittance PLL Structure for Grid-forming Power Converters in Microgrids
Authors Tarraso, Andres , Ignacio Candela, Jose , LAI, NGOC BAO, BALTAS, NICHOLAS-GREGORY, RODRÍGUEZ CORTÉS, PEDRO
External publication No
Means Ieee Energy Conversion Congress And Exposition
Scope Proceedings Paper
Nature Científica
Publication date 01/01/2020
ISI 000645593605058
Abstract Synchronization plays a fundamental role in connecting power electronic converters with the grid. Conventionally, the synchronous reference frame phase-locked loop (SRF-PLL) has been widely used to estimate the grid phase angle. Though SRF-PLL is effective under normal grid voltage conditions, its performance degrades drastically under weak grid conditions. This paper presents a control strategy for current controller of grid-connected power converters that contributes in the reduction of the negative effects of SRF-PLL during grid disturbances. The main control concept is based on virtual admittance. This approach is capable of operating effectively power converters when connected to weak grids and permit grid-forming operation. Simulation and experimental results are provided to validate the proposed controller.
Keywords Microgrid; synchronization system; synchronous reference frame; power converter control
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