Multi-Rotor Virtual Machine for Grid-Forming Converter to Damp Sub-Synchronous Resonances

Grid-forming power converters (GFMC) have been widely adopted in power systems as an attractive solution against the challenges imposed by the ever-increasing penetration of renewables. Despite its versatility, GFMC is employed only to provide islanded operation, grid regulations, and synthetic iner...

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Bibliographic Details
Published in:IEEE access 2021, Vol.9, p.128178-128187
Main Authors: Lai, Ngoc Bao, Baltas, Gregory N., Rodriguez, Pedro
Format: Article
Language:English
Subjects:
Admittance
Control stability
Damping
Eigenvalues
Frequency-selective damping
grid-forming power converter
Oscillations
Oscillators
Power converters
Power generation
power oscillation damping
Power system stability
Rotors
sub-synchronous oscillation
Synchronous machines
Systems stability
Tuning
Virtual environments
virtual synchronous machine
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Summary:Grid-forming power converters (GFMC) have been widely adopted in power systems as an attractive solution against the challenges imposed by the ever-increasing penetration of renewables. Despite its versatility, GFMC is employed only to provide islanded operation, grid regulations, and synthetic inertia. To further extend the use of GFMC in enhancing power system stability, this paper proposes a multi-rotor virtual machine (MRVM) controller to attenuate sub-synchronous oscillations. Driven by the formulation of a virtual synchronous machine (VSM), the proposed MRVM implements a VSM-based GFMC with several virtual rotors whose electromechanical characteristics can be individually adjusted to target specific oscillatory modes in the system. In this work, the MRVM's working principle is described in detail and tuning guidelines are proposed to simplify the selection of control parameters by using frequency-domain techniques and the eigenvalue locus analyses. To validate the performance of the MRVM, an IEEE benchmark grid model is adopted namely, the three-machine-infinite-bus system. It is evident from the results that the MRVM (i) provides higher degrees of freedom when dealing with sub-synchronous oscillations, and (ii) outperforms conventional GFMC, especially in damping intra-area power oscillations.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2021.3112070