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arXiv2026

Development of an EMT model of the Balearic power system

The Balearic Islands are striving to achieve 100% renewable energy, which poses new challenges in operating the power system securely and reliably. With a higher integration of inverter-based resources (IBRs) and a reduced presence of conventional synchronous generators, the system strength, particularly short circuit levels, becomes weaker and more susceptible to disturbances; and the total inertia of the system becomes lower. Technology enablers are planned to achieve energy transition in the Balearic power system: a new 2x200 MW VSC-HVDC link (bipole with metallic return), Synchronous Compensators (SC) and Battery Energy Storage Systems (BESS), as fully-integrated network components. Detailed ElectroMagnetic Transient (EMT) simulation studies may be needed to analyse stability of the system, due to the high amounts of power-electronics devices in the system. This paper describes the implementation of an EMT model of the Balearic power system.

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arXiv2024

Power Oscillation Damping Controllers for Grid-Forming Power Converters in Modern PowerSystems

Inter-area oscillations have been extensively studied in conventional power systems dominated by synchronous machines, as well as methods to mitigate them. Several publications have addressed Power Oscillation Damping (POD) controllers in grid-following voltage source converters (GFOL). However, the performance of POD controllers for Grid-Forming voltage source converters (GFOR) in modern power systems with increased penetration of power electronics requires further investigation. This paper investigates the performance of GFORs and supplementary POD controllers in the damping of electromechanical oscillations in modern power systems. This paper proposes POD controllers in GFORs by supplementary modulation of active- and reactive-power injections of the converter and both simultaneously (POD- P, POD-Q and POD-PQ, respectively). The proposed POD controllers use the frequency imposed by the GFOR as the input signal, which has a simple implementation and it eliminates the need for additional measurements. Eigenvalue-sensitivity methods using a synthetic test system are applied to the design of POD controllers in GFORs, which is useful when limited information of the power system is available. This paper demonstrates the effectiveness of POD controllers in GFOR converters to damp electromechanical oscillations, by small-signal stability analysis and non-linear time-domain simulations in a small test system and in a large-scale power system.

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