Journal
2023 IEEE POWER & ENERGY SOCIETY GENERAL MEETING, PESGM
Volume -, Issue -, Pages -Publisher
IEEE
DOI: 10.1109/PESGM52003.2023.10252895
Keywords
distributed energy resources; load shedding; power system protection; power system stability; smart grids
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The paper presents a conceptual framework for coordinating distributed energy resources in a data-rich environment to ensure optimal adaptive setting of UFLS relays. A novel adaptive UFLS scheme is proposed, and initial simulation results are provided.
Increasing penetrations of distributed renewables are decreasing the effectiveness of traditional decentralized under-frequency load shedding (UFLS) schemes. As more distribution circuits begin to back-feed the transmission system, operation of traditional UFLS may exacerbate frequency instability. This paper presents the conceptual framework for a data-rich environment to coordinate UFLS across multiple distribution providers based on the laminar coordination framework in order to ensure optimal adaptive setting of UFLS relays. Communication and control are enabled through a distributed implementation of the IEC 61968-1 Common Information Model message bus structure. In addition to the proposed architecture, a novel adaptive UFLS scheme informed by a bi-level state estimator to create optimal relay setpoints is introduced. Initial simulation results are presented for the IEEE 14-bus test system on scenarios leading to mis-operation of traditional UFLS.
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