Voltage Stability Assessment on Ethiopian 230 KV Transmission Network Using Modified Voltage Stability Indices

Tella, Teshome Goa; Sitati, Simiyu; Nvakoe, George N.

doi:10.1109/powerafrica.2018.8521144

Cited by 6 publications

(2 citation statements)

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“…Indices. e authors of [17] derived the modified voltage stability indices for the N-bus system. In this proposed method, the effect of transmission line conductance and active power, as well as the phase angle of the voltage, is neglected.…”

Section: Modified Voltage Stabilitymentioning

confidence: 99%

Voltage Stability Assessments and Their Improvement Using Optimal Placed Static Synchronous Compensator (STATCOM)

Wondie

Tella

2022

Journal of Electrical and Computer Engineering

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In this paper, static voltage stability assessments and their improvement using analytical and optimization techniques with different loading scenarios are described. In this study, the 400 kV, 230 kV, and 132 kV Ethiopian electric power networks are modeled using Power System Analysis Toolbox (PSAT), and the load flow analysis is carried out using MATLAB source code. Then, different voltage stability indices, such as the user-defined advanced voltage stability index (AVSI), modified voltage stability index (MVSI), and fast voltage stability index (FVSI), are used to identify the voltage unstable buses. Besides this, particle swarm optimization (PSO) is also used to find the optimal size and placement of the Static Synchronous Compensator (STATCOM) for the most severe buses identified by voltage stability indices. The result presents three special arguments: whether the most severe buses that are ranked at the top based on the voltage stability indices are optimal buses for compensation placement or not, the voltage stability improvement, and power loss reduction with the introduction of STATCOM. Accordingly, it is observed that the weakest bus that is identified through the stability indices may not be the optimal placement of the compensation device. It is also indicated that, with the introduction of STATCOM to the optimal selected bus, the network power loss is reduced from 46.65 MW to 33.32 MW and its voltage magnitude in all buses is also improved. All bus voltages are within the IEEE standard acceptable limit.

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Section: Modified Voltage Stabilitymentioning

confidence: 99%

Voltage Stability Assessments and Their Improvement Using Optimal Placed Static Synchronous Compensator (STATCOM)

Wondie

Tella

2022

Journal of Electrical and Computer Engineering

Self Cite

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“…Additionally, the papers, in the academia, that considered the issue are limited in number and methodology. It is tried to investigate voltage stability in EEP considering only the 230 kV transmission system in [32]. This, however, doesn't suffice to see the full picture of the problem within the EEP system.…”

Section: Ahadu Hilawie and Fekadu Shewaregamentioning

confidence: 99%

Static Voltage Stability Assessment of Ethiopian power System Using Normalized Active Power Margin Index

Hilawie

Shewarega

2022

EAI Endorsed Trans Energy Web

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Voltage stability assessments, made so far on the Ethiopian electric power system (EEP), are limited both in number and in methodology. Here, in this paper the static voltage stability of the Ethiopian power system is investigated using an index called normalized active power margin. The methodology starts from determining Thevenin equivalent of a system as viewed from the load buses. The Thevenin equivalent parameters help to determine the load bus maximum active power transfer limit and to draw the PV relation curves. The approach avoids the time-consuming method of PV curve based maximum active power transfer determination, which requires large number of power flow computations. The resulting maximum active power transfer and current operating active power load are used for the index calculation. The index is tested using IEEE 30 bus system and produced results matching with other previously established indices. The index is capable of ranking vulnerability of load buses to voltage instability. Then, scenarios of heavy load and light load EEP cases, with and without system reactive power compensation, are investigated. Results reveal weakest buses are supplied from 66kV transmission lines, load bus 232 being the weakest of all. On the other hand, the most stable buses are supplied from 132 kV transmission lines, bus 149 being the most stable bus. PV curves drawn, also, reveal the improvement that come with reactive power compensation and with operating in light load condition.

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The Stability Assessment of Responsible Oilfield Power Consumers

Лосев

Prokopchuk

Сушков

2019

2019 Dynamics of Systems, Mechanisms and Machines (Dynamics)

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Voltage Stability Assessment on Ethiopian 230 KV Transmission Network Using Modified Voltage Stability Indices

Cited by 6 publications

References 1 publication

Voltage Stability Assessments and Their Improvement Using Optimal Placed Static Synchronous Compensator (STATCOM)

Voltage Stability Assessments and Their Improvement Using Optimal Placed Static Synchronous Compensator (STATCOM)

Static Voltage Stability Assessment of Ethiopian power System Using Normalized Active Power Margin Index

The Stability Assessment of Responsible Oilfield Power Consumers

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