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Novel Decentralized Load Shedding Algorithm for Preserving Voltage Stability in Smart Grids
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DOI：10.1109/TSG.2026.3662195.png)
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Abstract
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The occurrence of a short-circuit fault leads to the voltage reduction in power networks, and subsequently, induction motors experience relative speed decrease. This speed decline can sometimes lead to motor stalling for which, motors demand several times their rated current, drawing considerable reactive current. In the networks with a high penetration of motor loads, this can delay voltage recovery, posing a risk of short-term voltage instability. In order to enhance stability, this paper proposes a load shedding index based on kinetic energy to determine the level of kinetic energy of each motor. Motor loads, proportional to their kinetic energy, impose stress on the network. Thus, a load shedding scheme based on this index is presented. Initially, the proposed index is evaluated experimentally for an industrial induction motor and then is assessed on two active distribution networks. Subsequently, to evaluate the comprehensiveness of the index for larger networks, proper appraisal is conducted on a real sizable, multi-voltage-level power grid model and compared to other load-shedding schemes. Results demonstrate the effectiveness of the proposed method in addressing short-term voltage instability, requiring less load shedding compared to other approaches. Furthermore, the proposed method is computationally efficient and suitable for real-time implementation.
Keywords:
Active distribution network (ADN)
fault-induced delayed voltage recovery (FIDVR)
induction motor
load shedding
voltage stability
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