Improved Control Strategy Of Grid Forming Inverters For Fault Ride Through In A Microgrid System
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Improved Control Strategy of Grid-Forming Inverters for Fault Ride-Through in a Microgrid System
This paper develops an improved control strategy of grid-forming (GFM) inverters with fault ride-through (FRT) capabilities to guarantee the stable operation of microgrids under fault conditions, especially islanded microgrids and asymmetrical faults. The proposed control strategy includes the dual control of positive-sequence and negative-sequence control as well as the adaptive virtual impedance (VI) control. Unlike existing works, the proposed strategy applies the VI control for only the d component of the positive-sequence control and leaves the q component of the positive-sequence control and the dq component of the negative-sequence control as zero, thus achieving improved stability and balanced three-phase voltages under asymmetrical faults. The adaptive feature of the VI control guarantees the stability of the GFM inverter under severe faults, which could cause the saturation of the inner current loop, and the instability if the VI is not adaptive. Simulation results of various unbalanced faults with high and low fault impedances show that the proposed control strategy improves the stability of the GFM inverter and achieves stable and balanced output voltages in islanded microgrids. And the algorithm also improves the stability of GFM inverters under balanced faults with high and low fault impedances.
Improved Control Strategy of Grid-Forming Inverters for Fault Ride-Through in a Microgrid System: Preprint
This paper develops improved control strategy of GFM inverter with fault ride-through (FRT) capabilities to guarantee stable operation of microgrid under fault conditions especially islanded microgrid and asymmetrical faults. The proposed control strategy includes dual control of positive-sequence and negative-sequence control, and the adaptive virtual impedance (VI) control. Unlike the existing works, the proposed strategy only applies the VI control for the d-component of the positive-sequence control and leaves the q-component of positive-sequence control and dq-component of negative-sequence control zero, thus achieving the improved stability and balanced three-phase voltage under asymmetrical faults. The adaptive feature of the VI control guarantees the stability of the GFM inverter under severe faults which could cause saturated inner current loop and instability if the VI is not adaptive. Simulation results of a phase-to-phase-ground fault show that the proposed control strategy improves the stability of GFM and achieves the stable and balanced output voltages in islanded microgrid.
Grid-Forming Converters
Grid-Forming Converters: Principles, Control, and Applications in Modern Power Systems is a pioneering guidebook to this state-of-the-art technology and its potential in enabling more-electronics grids and deep renewable integration for the energy systems of the future. Beginning with a clear explanation of the challenges presented for the standard synchronous generator or grid-tied converters by fossil-fuel phase-out and renewable integration, this book goes on to explain the fundamental concepts of grid-forming converters.Having established a solid foundational understanding the reader will learn practical techniques for implementation including design, control, analysis, and optimization. Finally, readers tackle case studies and example applications from energy storage to electric vehicles. From several of the foremost experts and educators in energy systems and power electronics, Grid-Forming Converters is an essential tool for students, professors and engineers working to make renewable-based grids a reality. - Builds a clear, foundational understanding of the technology of grid-forming converters and its importance in resolving the challenges of renewable-based grids - Offers a holistic guide to the operation and implementation of the technology, from design to modeling and optimization - Provides case studies and simulation codes to enable new and emerging applications - Equips the reader to use this pioneering technology for more electronics and the renewable grids of the future