Study of the impact of longitudinal variations in ambient conditions on transmission line voltage stability margin

2017 ◽  
Author(s):  
Mahbubur Rahman ◽  
Christoph Braun ◽  
Valentina Cecchi
Keyword(s):  
Transmission Line ◽  
Voltage Stability ◽  
Stability Margin ◽  
Ambient Conditions ◽  
Line Voltage ◽  
Voltage Stability Margin ◽  
Longitudinal Variations ◽  
The Impact

scholarly journals Implementation of Static Line Voltage Stability Indices for Improved Static Voltage Stability Margin

2019 ◽  
Vol 2019 ◽  
pp. 1-14 ◽  
Author(s):  
Natakorn Thasnas ◽  
Apirat Siritaratiwat
Keyword(s):  
Optimal Power Flow ◽  
Voltage Stability ◽  
Stability Margin ◽  
Stability Index ◽  
System Stability ◽  
Line Voltage ◽  
Voltage Stability Index ◽  
Static Voltage Stability ◽  
Voltage Stability Margin ◽  
Stability Indices

Nowadays, the changes of economic, environment, and regulations are forcing the electric utilities to operate systems at maximum capacity. Therefore, the operation and control of power system to improve the system stability has been receiving a great deal of attention. This paper presents an approach for enhancing the static voltage stability margin and reducing the power losses of the system with voltage security-constrained optimal power flow (VSC-OPF) that is based on static line voltage stability indices. The control approaches incorporate the voltage stability criteria into the conventional OPF. The minimization of the summation of fast voltage stability index (FVSI), line stability index (Lmn), and line voltage stability index (LVSI) is used as the objective functions. The performance and effectiveness of the proposed control approaches are evaluated on the standard IEEE 30-bus, 57-bus, and 118-bus test systems under normal and contingency conditions. The comparison analysis is carried out with different cases including minimization of generation cost. The proposed control approaches indicate the promising results and offer efficient countermeasures against the voltage instability of the system.

scholarly journals Stochastic voltage stability margin in unbalance feeder with fuzzy based distributed generation placement

2018 ◽  
Vol 7 (2.21) ◽  
pp. 53
Author(s):  
Jagdish Prasad Sharma ◽  
H Ravishankar Kamath
Keyword(s):  
Distributed Generation ◽  
Voltage Stability ◽  
Stability Margin ◽  
Test System ◽  
Load Flow ◽  
Base Case ◽  
Time Interval ◽  
Voltage Stability Margin ◽  
The Impact ◽  
Distributed Generation Placement

In this paper, the impact of distributed generation (DG) integration on worst stochastic voltage stability margin is investigated for a modified IEEE 37 node test system. This unbalance test system has voltage sensitive load model for industrial, commercial and residential consumers and load flow computed in MATLAB environment with 15 minutes metering time interval for a whole day. DG integration is based on fuzzy expert system and integrated between 35 to 73 period of metering time interval. The stochastic voltage stability margin for all phase are evaluated under three different DG operational scenarios and compared with results obtained in the base case. The cause and consequence of unbalance phenomena is also broadly discussed in detail. 

scholarly journals Network Structure-Based Critical Bus Identification for Power System Considering Line Voltage Stability Margin

2018 ◽  
Vol 06 (09) ◽  
pp. 97-111 ◽  
Author(s):  
Oludamilare Bode Adewuyi ◽  
Mir Sayed Shah Danish ◽  
Abdul Motin Howlader ◽  
Tomonobu Senjyu ◽  
Mohammed E. Lotfy
Keyword(s):  
Power System ◽  
Network Structure ◽  
Voltage Stability ◽  
Stability Margin ◽  
Line Voltage ◽  
Voltage Stability Margin

scholarly journals Identification of Optimal Path in Power System Network Using Bellman Ford Algorithm

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
S. Hemalatha ◽  
P. Valsalal
Keyword(s):  
Power System ◽  
Transmission Line ◽  
Shortest Path ◽  
Voltage Stability ◽  
Optimal Path ◽  
Power Balance ◽  
Line Voltage ◽  
System Components ◽  
Path Search ◽  
Search Guidance

Power system network can undergo outages during which there may be a partial or total blackout in the system. In that condition, transmission of power through the optimal path is an important problem in the process of reconfiguration of power system components. For a given set of generation, load pair, there could be many possible paths to transmit the power. The optimal path needs to consider the shortest path (minimum losses), capacity of the transmission line, voltage stability, priority of loads, and power balance between the generation and demand. In this paper, the Bellman Ford Algorithm (BFA) is applied to find out the optimal path and also the several alternative paths by considering all the constraints. In order to demonstrate the capability of BFA, it has been applied to a practical 230 kV network. This restorative path search guidance tool is quite efficient in finding the optimal and also the alternate paths for transmitting the power from a generating station to demand.

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