scholarly journals Performance Comparison of Voltage Stability Indices for Weak Bus Identification in Power Systems

2013 ◽  
Vol 16 ◽  
pp. 012022
Author(s):  
R Verayiah ◽  
A Mohamed ◽  
H Shareef ◽  
I Hj Zainal Abidin
Keyword(s):  
Power Systems ◽  
Voltage Stability ◽  
Performance Comparison ◽  
Weak Bus ◽  
Stability Indices

scholarly journals A Recap of Voltage Stability Indices in the Past Three Decades

2019 ◽  
Author(s):  
Mir Sayed Shah Danish ◽  
Tomonobu Senjyu ◽  
Sayed Mir Shah Danish ◽  
Najib Rahman Sabory ◽  
Narayanan K ◽  
...  
Keyword(s):  
Power Systems ◽  
Voltage Stability ◽  
Monitoring And Control ◽  
Application Performance ◽  
The Past ◽  
Increasing Demand ◽  
Exhaustive Study ◽  
And Control ◽  
Stability Limits ◽  
Stability Indices

Increasing demand for electricity and modernization of power systems within competitive markets induce power systems to operate close to their stability limits. Therefore, a power system continuous monitoring and control by using voltage stability indices are known exigence. This is the first-ever effort, examined more than 40 voltage stability indices thorough an exhaustive study based in on their formulation, application, performance, and assessment measures. Which is conducted based on a logical and chronological order considering the most recent worldwide applied voltage stability indices. However, the generalizability of such an immense diversity of these indices in term of multivariable objectives subjects to a certain limitation to summate into a deciphered outcome. Despite all these obstacles, this study systematically reviews available indices in the literature within the past three decades to set out an integrated knowledge with an insight up-to-date exposition. That followed with a comparative analysis in term of their similarity, functionality, applicability, formulation, merit, demerit, and overall performances. Also, a broad categorization of voltage stability indices is addressed. This study with an immediate implication in practice as an exhaustive roadmap can be counted a planning and operation reference in the context of voltage stability for students, researchers, scholars, and practitioners.

scholarly journals A Recap of Voltage Stability Indices in the Past Three Decades

Energies ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1544 ◽  
Author(s):  
Mir Sayed Shah Danish ◽  
Tomonobu Senjyu ◽  
Sayed Mir Shah Danish ◽  
Najib Rahman Sabory ◽  
Narayanan K ◽  
...  
Keyword(s):  
Power Systems ◽  
Voltage Stability ◽  
Monitoring And Control ◽  
Application Performance ◽  
The Past ◽  
Overall Performance ◽  
Increasing Demand ◽  
And Control ◽  
Stability Limits ◽  
Stability Indices

Increasing demand for electricity and the modernization of power systems within competitive markets has induced power systems to operate close to their stability limits. Therefore, the continuous monitoring and control of power systems through voltage stability indices is urgently needed. This is the first-ever effort to examine more than 40 voltage stability indices based on their formulation, application, performance, and assessment measures. These indices are sorted based on a logical and chronological order considering the most recent indices to be applied worldwide. However, the generalizability of these indices in terms of multivariable objectives is limited. Despite its limitation, this study systematically reviews available indices in the literature within the past three decades to compile an integrated knowledge base with an up-to-date exposition. This is followed by a comparative analysis in terms of their similarity, functionality, applicability, formulation, merit, demerit, and overall performance. Also, a broad categorization of voltage stability indices is addressed. This study serves as an exhaustive roadmap of the issue and can be counted as a reference for planning and operation in the context of voltage stability for students, researchers, scholars, and practitioners.

Voltage stability indices for stressed power systems

1993 ◽  
Vol 8 (1) ◽  
pp. 326-335 ◽  
Author(s):  
P.-A. Lof ◽  
G. Andersson ◽  
D.J. Hill
Keyword(s):  
Power Systems ◽  
Voltage Stability ◽  
Stability Indices

scholarly journals ANN based SVC FACTS Controller to Enhance Voltage Stability of Multi-Machine Power System

2019 ◽  
Vol 8 (10) ◽  
pp. 381-387
Keyword(s):  
Power Systems ◽  
Power Supply ◽  
Voltage Stability ◽  
Reactive Power ◽  
Short Circuit ◽  
Supply And Demand ◽  
Optimal Location ◽  
Voltage Sensitivity ◽  
Index Value ◽  
Weak Bus

Voltage stability is the most vital phenomena in power systems which may be disturbed by the mismatch between the reactive power supply and demand. The occurrence of internal faults in the equipment and short circuit faults also there may be voltage collapse at the buses. Voltage stability can be improved using Static VAR Compensator (SVC) which is a shunt device. It can generate or absorb reactive power in a controlled manner such that it can enhance voltage stability of the system. LIndex method is used to determine voltage sensitivity at each bus and the bus having highest L- index value can be considered as a weak bus which is the optimal location of FACTS controller. The investigation is made to observe how susceptance in susceptance model and firing angle in firing angle model of the SVC is predicted to enhance the voltage at each bus by the artificial neural network under chaotic load. Standard IEEE 5 bus and 30 bus systems are considered as test systems and simulations are performed in MATLAB software.

scholarly journals Voltage Stability Indices: Formulation and Classification Perspectives

2019 ◽  
Vol 8 (12) ◽  
pp. 5777-5785
Keyword(s):  
Power Systems ◽  
Voltage Stability ◽  
Stability Margin ◽  
Stability Evaluation ◽  
Chronological Order ◽  
Real Time Control ◽  
Voltage Instability ◽  
Time Control ◽  
Voltage Stability Margin ◽  
Stability Indices

Voltage instability had been observed as the foremost cause of blackout incidents worldwide in last three decades. In order to deploy an appropriate countermeasure and enhance voltage stability margin, voltage stability predictor is of utmost importance. Therefore, much research had been focussed to propose voltage stability indices (VSIs) that can identify weak areas and overall condition of power systems. In this paper systematic review covering imperative aspects of formulation theory, expressions, critical values and applicability of VSIs has been presented in chronological order. A broad categorization of VSIs is also addressed. An inclusive review provides a strong foundation for further research in the perspective of voltage stability evaluation for real-time control applications.

Optimal Placement of FACTS Devices for Voltage Stability Improvement with Economic Consideration Using Firefly Algorithm

2019 ◽  
Vol 14 (1) ◽  
pp. 5-11
Author(s):  
S. Rajasekaran ◽  
S. Muralidharan
Keyword(s):  
Power Systems ◽  
Voltage Stability ◽  
Firefly Algorithm ◽  
Transmission System ◽  
Operating Conditions ◽  
Optimal Placement ◽  
Voltage Collapse ◽  
Facts Devices ◽  
The Cost ◽  
Bus System

Background: Increasing power demand forces the power systems to operate at their maximum operating conditions. This leads the power system into voltage instability and causes voltage collapse. To avoid this problem, FACTS devices have been used in power systems to increase system stability with much reduced economical ratings. To achieve this, the FACTS devices must be placed in exact location. This paper presents Firefly Algorithm (FA) based optimization method to locate these devices of exact rating and least cost in the transmission system. Methods: Thyristor Controlled Series Capacitor (TCSC) and Static Var Compensator (SVC) are the FACTS devices used in the proposed methodology to enhance the voltage stability of power systems. Considering two objectives of enhancing the voltage stability of the transmission system and minimizing the cost of the FACTS devices, the optimal ratings and cost were identified for the devices under consideration using Firefly algorithm as an optimization tool. Also, a model study had been done with four different cases such as normal case, line outage case, generator outage case and overloading case (140%) for IEEE 14,30,57 and 118 bus systems. Results: The optimal locations to install SVC and TCSC in IEEE 14, 30, 57 and 118 bus systems were evaluated with minimal L-indices and cost using the proposed Firefly algorithm. From the results, it could be inferred that the cost of installing TCSC in IEEE bus system is slightly higher than SVC.For showing the superiority of Firefly algorithm, the results were compared with the already published research finding where this problem was solved using Genetic algorithm and Particle Swarm Optimization. It was revealed that the proposed firefly algorithm gives better optimum solution in minimizing the L-index values for IEEE 30 Bus system. Conclusion: The optimal placement, rating and cost of installation of TCSC and SVC in standard IEEE bus systems which enhanced the voltage stability were evaluated in this work. The need of the FACTS devices was also tested during the abnormal cases such as line outage case, generator outage case and overloading case (140%) with the proposed Firefly algorithm. Outputs reveal that the recognized placement of SVC and TCSC reduces the probability of voltage collapse and cost of the devices in the transmission lines. The capability of Firefly algorithm was also ensured by comparing its results with the results of other algorithms.

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