A New Approach for Long-Term Stability Estimation Based on Voltage Profile Assessment for a Power Grid

Alireza Pourdaryaei, Amidaddin Shahriari, Mohammad Mohammadi, Mohammad Reza Aghamohammadi, Mazaher Karimi and Kimmo Kauhaniemi ()
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Alireza Pourdaryaei: Substations and Relays Repairs and Maintenance Affairs, Operation and Protection Office, Hormozgan Regional Electric Company, Bandar Abbas 7916795599, Iran
Amidaddin Shahriari: Department of Electrical Engineering, Islamic Azad University, South Tehran Branch, Tehran 1477893855, Iran
Mohammad Mohammadi: Department of Power and Control, School of Electrical and Computer Engineering, Shiraz University, Shiraz 7194684334, Iran
Mohammad Reza Aghamohammadi: Department of Electrical Engineering, Shahid Abbaspour School of Engineering, Shahid Beheshti University, Tehran 1983969411, Iran
Mazaher Karimi: School of Technology and Innovations, University of Vaasa, Wolffintie 34, 65200 Vaasa, Finland
Kimmo Kauhaniemi: School of Technology and Innovations, University of Vaasa, Wolffintie 34, 65200 Vaasa, Finland

Energies, 2023, vol. 16, issue 5, 1-21

Abstract: Load flow solutions refer to the steady-state stability of power systems and have a crucial role in the design and planning of slow-changing elements; e.g., in online tab changing actions, automatic generation control, over-excitation limiters and the power recovery characteristics of a load. Therefore, the purpose of this work was to show the connectivity between load flow analysis and long-term voltage stability using a generator model by introducing a novel voltage stability assessment based on the multi-machine dynamic model along with the load flow study for a power grid. The Euclidean distance (ED) was used to introduce a new voltage stability index based on the voltage phasor profile for real-time monitoring purposes. The effects of reactive power compensation, in addition to load-generation patterns and network topology changes in the system behavior, could be seen clearly on the voltage profiles of the buses. Thus, the increased values for the EDs of the buses’ voltage amplitudes—from 0 to around 1.5 (p.u.)—implied that the system was approaching the voltage collapse point, corresponding to the Jacobian matrix singularity of the load flow equation. Moreover, the weakest load bus with respect to any system change was also identified. Indeed, the criticality of any network interruption was in direct proportion to this voltage stability index. The proposed method was validated using the IEEE 118-bus test system.

Keywords: Euclidean distance; load flow analysis; maximum loading point; steady-state voltage stability index (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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