Assessment of line stability indices in detection of voltage stability status

Yari, Siavash; Khoshkhoo, Hamid

doi:10.1109/eeeic.2017.7977454

Cited by 21 publications

(12 citation statements)

References 25 publications

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“…where Z i is the impedance of the Line i, E th is the terminal voltage of the nearest generator to the sending bus of Line i, and Z th is the total impedance of the shortest path from the sending bus of line i to the nearest generator. It should be stated that, based on voltage magnitude criteria, among those buses across line i, the one whose voltage magnitude is greater than the other bus is selected as the sending bus [35], [36]. Critical value of ILSZ is unity, which means that, as the power passing through the line reaches the maximum transferrable power, ILSZ gets closer to unity.…”

Section: Assessment Of Voltage Stability Status Using Ilszmentioning

confidence: 99%

“…Steps ), sort them in descending order and determine their sending and receiving buses by the voltage magnitude criterion [35], [36]. Starting from the first critical line (the most critical one), sort the reactive power resources that can generate more reactive power, based on their ED, to the receiving bus of the intended critical line.…”

Section: Step 4: Generation Reschedulingmentioning

confidence: 99%

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A Remedial Action Scheme to Prevent Mid/Long-Term Voltage Instabilities

Khoshkhoo

Yari

Pouryekta³

et al. 2021

IEEE Systems Journal

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The main objective of this article is to propose a special protection system (SPS) to execute efficient remedial actions to prevent mid-term and long-term voltage instabilities. In this method, when the operating point (OP) leaves the normal operation state, the proposed SPS is initiated to execute the required corrective remedial actions to bring the OP back to a normal state and maintain bus voltages above prespecified thresholds. Considering the local nature of Volt/Var control and in order to execute fast remedial actions, in this approach, the required generation rescheduling or load shedding procedures were selected based on the electrical distance concept. This allows for remedial actions with the highest impact on volt/var control. In addition, in generation rescheduling procedures, the proposed method uses the ability of utility-scale photovoltaic resources, which can change their generation quickly. This plays a major role in maintaining stability of power systems. Efficiency of the proposed algorithm was validated through several scenarios performed in IEEE 39-bus, Nordic32, and PST 16 test systems using DIgSILENT PowerFactory software. Results of these dynamic simulations and their comparison with some previously published methods show the effectiveness of this method in timely executing appropriate remedial actions to maintain system stability.

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Section: Assessment Of Voltage Stability Status Using Ilszmentioning

confidence: 99%

Section: Step 4: Generation Reschedulingmentioning

confidence: 99%

A Remedial Action Scheme to Prevent Mid/Long-Term Voltage Instabilities

Khoshkhoo

Yari

Pouryekta³

et al. 2021

IEEE Systems Journal

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“…So, in these cases, proper selection of the SB and RB to accurately assess the stability is inevitable. In this respect, two criteria are analyzed to select the SB and RB: Voltage‐magnitude criterion: The bus with higher voltage magnitude is selected as the SB. Voltage‐angle criterion: The bus with higher voltage angle is selected as the SB. On the basis of Figure , connecting the capacitor at 50% of ML as well as increasing the loading (from 50% to 100% ML) causes the active power loss of line 2‐5 to increase, which indicates that the operating point is approaching to stability boundary . Accordingly, in this situations, the value of line index (calculated for line 2‐5) should also be increased to properly show the stability status of the system.…”

Section: Assessment Of Line Indices Against Different Directions Of Pmentioning

confidence: 99%

“…In this paper, two criteria that provided by authors in previous paper are studied to select the SB and RB, which will be described below. To evaluate the performance of these indicators based on these two criteria, a modified version of IEEE 14‐bus test system shown in Figure has been used .…”

Section: Assessment Of Line Indices Against Different Directions Of Pmentioning

confidence: 99%

“…According to the extensive investigation of authors, although few research works have assessed some line stability indicators and compared the performance of them, [24][25][26][27][28][29][30][31] the performance of these indices has not been properly analyzed yet. Simulation results proposed by Yari and Khoshkhoo 32 show that the performance of these indices highly depends on the power-system structure as well as system operating point and a detailed study is still required to determine the advantages and disadvantages of these indices.…”

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confidence: 99%

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A comprehensive assessment to propose an improved line stability index

Yari

Khoshkhoo

2019

Int Trans Electr Energ Syst

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Summary So far, several line stability indices have been introduced and used for evaluating voltage stability status of power systems. The objective of this paper is to propose a comprehensive assessment of these indices and also to propose a modified line stability index to accurately assess the stability status of networks in different situations. To this purpose, the performance of several line indices at different conditions is analyzed. Also, to categorize system states to normal, alert, and emergency, proper thresholds are proposed for these indices. It will be shown that although line indices are able to properly assess the stability of a two‐bus system, they cannot detect the stability status in real networks. Therefore, a modified index has been proposed, which can accurately assess the stability status of power systems. The static and dynamic simulation results performed in the Institute of Electrical and Electronics Engineer (IEEE) 39‐ and 118‐bus test systems verify the performance of the proposed index.

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