Volume 22, Issue 3 (JIAEEE Vol.22 No.3 2025)
Journal of Iranian Association of Electrical and Electronics Engineers 2025, 22(3): 130-142 |
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Rahimi H, Mirzabeigi A, Moradi M H. An Adaptive Under Frequency Load Shedding For Frequency Stabilization of Power Systems Considering Voltage and System Inertia Changes. Journal of Iranian Association of Electrical and Electronics Engineers 2025; 22 (3) :130-142
URL: http://jiaeee.com/article-1-1732-en.html
URL: http://jiaeee.com/article-1-1732-en.html
Department of Electrical Engineering, Bu-Ali Sina University
Abstract: (55 Views)
Abstract
Maintaining the network frequency close to its nominal value is crucial for the stability of a power network. When frequency stability is compromised due to an imbalance between production and consumption, it can cause significant damage to network equipment, including turbines and motors. The under-frequency load-shedding plan is a critical protection strategy in power systems, designed to keep the frequency within acceptable limits during severe power shortages. Conventional load-shedding schemes often face challenges in accurately estimating the active power deficit because they typically overlook the voltage dependence of loads and the precise value of the inertia constant. This oversight introduces uncertainty in power deficit estimation, potentially leading to significant adverse effects and even system collapse. This article proposes a load-shedding plan that assumes all production resources and loads are concentrated in a single bus. It introduces a voltage-frequency index to accurately estimate the active power deficit and adjusts the inertia constant during the load-shedding stages to determine the appropriate amount of load to be shed. To demonstrate the effectiveness of the proposed plan, four scenarios were tested using the IEEE 39-bus system in DigSILENT software. The simulation results validate the effectiveness and stability of the proposed approach.
Maintaining the network frequency close to its nominal value is crucial for the stability of a power network. When frequency stability is compromised due to an imbalance between production and consumption, it can cause significant damage to network equipment, including turbines and motors. The under-frequency load-shedding plan is a critical protection strategy in power systems, designed to keep the frequency within acceptable limits during severe power shortages. Conventional load-shedding schemes often face challenges in accurately estimating the active power deficit because they typically overlook the voltage dependence of loads and the precise value of the inertia constant. This oversight introduces uncertainty in power deficit estimation, potentially leading to significant adverse effects and even system collapse. This article proposes a load-shedding plan that assumes all production resources and loads are concentrated in a single bus. It introduces a voltage-frequency index to accurately estimate the active power deficit and adjusts the inertia constant during the load-shedding stages to determine the appropriate amount of load to be shed. To demonstrate the effectiveness of the proposed plan, four scenarios were tested using the IEEE 39-bus system in DigSILENT software. The simulation results validate the effectiveness and stability of the proposed approach.
Keywords: Frequency Control, Active Power Deficit, Inertia Constant, Voltage-Frequency Index Coefficient, Adaptive under-frequency Load Shedding
Type of Article: Research |
Subject:
Power
Received: 2024/06/12 | Accepted: 2024/10/1 | Published: 2025/12/12
Received: 2024/06/12 | Accepted: 2024/10/1 | Published: 2025/12/12
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