Effects of Cascaded Voltage Collapse and Protection of Many Induction Machine Loads upon Load Characteristics Viewed from Bulk Transmission System

2008 ◽  
Vol 128 (3) ◽  
pp. 545-550 ◽  
Author(s):  
Teruhisa Kumano
Keyword(s):  
Induction Machine ◽  
Transmission System ◽  
Voltage Collapse ◽  
Load Characteristics

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.

INDUCTION MACHINE MODELS NEAR VOLTAGE COLLAPSE

1997 ◽  
Vol 25 (1) ◽  
pp. 15-27
Author(s):  
M. TALEB ◽  
S. AHMED-ZAID ◽  
W. W. PRICE
Keyword(s):  
Induction Machine ◽  
Voltage Collapse

Wide-area voltage control system of flexible AC transmission system devices to prevent voltage collapse

2017 ◽  
Vol 11 (18) ◽  
pp. 4556-4564 ◽  
Author(s):  
Mathieu Perron ◽  
Esmaeil Ghahremani ◽  
Annissa Heniche ◽  
Innocent Kamwa ◽  
Claude Lafond ◽  
...  
Keyword(s):  
Control System ◽  
Voltage Control ◽  
Transmission System ◽  
Wide Area ◽  
Voltage Collapse ◽  
Flexible Ac Transmission ◽  
Flexible Ac Transmission System ◽  
Ac Transmission

Test of Significance and Fiducial Limit of Voltage Stability Index for Indian 205 Bus System

2019 ◽  
pp. 1-14
Author(s):  
Madhvi Gupta ◽  
N. K. Sharma ◽  
A. K. Gupta
Keyword(s):  
Voltage Stability ◽  
Stability Index ◽  
Maximum Load ◽  
Transmission System ◽  
Power Delivery ◽  
Voltage Collapse ◽  
Stressed Condition ◽  
Voltage Profile ◽  
Voltage Stability Index ◽  
Test Of Significance

Voltage delivery stability is frequently used to analyze power delivery systems. Under stressed condition, these indices denote the flexibility of voltage stability condition and predict the voltage collapse phenomenon by weak area clustering. The prediction of voltage collapse is very important for the smooth operation of power system, so that situation of voltage collapse could be avoided. For small transmission system, these indices work satisfactorily. In the present work, a large transmission system equivalent to 205 bus Indian transmission system has been examined. The Fast Voltage Stability Index (FVSI) proposed has been applying to test the system under consideration. Various aspects of power delivery system for example voltage profile, maximum load-ability limit, weakest bus and the different weak area clustering have been examined. Although the FVSI values obtained in the test result are capable of identifying the weak buses of the system, yet they vary in a non-linear manner i.e. for increasing values of load, the FVSI values first increase and then decrease.

scholarly journals Investigation of Load Sharing and Dynamic Load Characteristics of a Split Torque Transmission System with Double-Helical Gear Modification

2021 ◽  
Vol 2021 ◽  
pp. 1-22
Author(s):  
Xuan Liu ◽  
Zongde Fang ◽  
Haitao Jia ◽  
Ning Zhao ◽  
Yunbo Shen ◽  
...  
Keyword(s):  
Dynamic Load ◽  
Load Sharing ◽  
Helical Gear ◽  
Transmission System ◽  
Time Varying ◽  
Tooth Contact Analysis ◽  
Meshing Stiffness ◽  
Torque Transmission ◽  
Load Characteristics ◽  
Split Torque

A new dynamic model for a two-input two-path split torque transmission system which considers meshing error, time-varying meshing stiffness, and meshing-in impact is proposed. Time-varying meshing stiffness and meshing-in impact of each gear pair are accurately calculated based on tooth contact analysis and loaded tooth contact analysis. Equivalent displacements of eccentricity error and installation error along the meshing line of second- and third-stages gears are derived. The modified tooth surface of a third-stage double-helical gear is obtained by optimizing the amplitude of static loaded transmission error and meshing-in impact via nondominated sorting genetic algorithm-II (NSGA-II). Influence of modification on load sharing and dynamic load characteristics of split torque transmission system is investigated. The results indicate that the system’s dynamic meshing force increases when meshing-in impact is accounted for, which is unfavorable for the transmission. Following the modification of a double-helical gear, the dynamic load characteristics of the split torque transmission system are significantly improved, while its load sharing characteristics are improved to a certain extent.

Simulation Study on Power Load Characteristics Influence Voltage Collapse Process

2013 ◽  
Vol 706-708 ◽  
pp. 1810-1813
Author(s):  
Xiao Hui Bao
Keyword(s):  
System Design ◽  
Simulation Study ◽  
Simulation System ◽  
Circuit Model ◽  
Voltage Collapse ◽  
Basic Circuit ◽  
Power Load ◽  
Load Characteristics ◽  
Load Conditions ◽  
Collapse Process

This paper proceeds from basic circuit model, analyzing the influence of different characteristic load on voltage collapse. And then make the simulation system design. Take some examples to analyze the relation of the process of voltage collapse with system and load conditions.

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