Differential Evolution Technique for the Optimization of Reactive Power Reserves

2017 ◽  
Vol 26 (10) ◽  
pp. 1750155 ◽  
Author(s):  
Biplab Bhattacharyya ◽  
Saurav Raj
Keyword(s):  
Differential Evolution ◽  
Modal Analysis ◽  
Voltage Stability ◽  
Reactive Power ◽  
Stability Margin ◽  
Optimization Techniques ◽  
Planning Problem ◽  
Power Sources ◽  
Voltage Stability Margin ◽  
Reactive Power Planning

In the present work, reactive power planning problem along with voltage stability margin is addressed by effective co-ordination of reactive power sources. Modal analysis and L-index methods are used to detect weak nodes of the system accordingly. Differential Evolution (DE) and Genetic Algorithm (GA)-based optimization techniques are applied for the proper co-ordination of Var sources under base and increased loading conditions maintaining voltage stability of the connected power network. The problem is multi-objective and IEEE 30 bus system is taken as the standard system. It is observed that modal analysis based detection of weak nodes are more effective than the L-index-based detection. Moreover, the DE-based optimization algorithm gives better result compared to GA-based approach in maximizing reactive power reserves.

scholarly journals Transmission congestion management considering voltage stability margin

2021 ◽  
Vol 3 (2) ◽  
Author(s):  
Nilesh K. Patel ◽  
Bhavik N. Suthar ◽  
Jalpa Thakkar
Keyword(s):  
Power Generation ◽  
Voltage Stability ◽  
Reactive Power ◽  
Stability Margin ◽  
Congestion Management ◽  
Test System ◽  
Optimization Techniques ◽  
Voltage Profile ◽  
Transmission Congestion ◽  
Voltage Stability Margin

AbstractThis paper presents a solution for the transmission congestion management considering voltage stability issues using optimal generation rescheduling. While practicing congestion management using optimization techniques, the control variables remain under their upper or lower limits but it may lead to the lowered level of voltage security after optimization. To counterbalance this adverse effect, a modified objective function has been used. The reactive power generation rescheduling and reactive support from capacitors have been incorporated along with active power generation rescheduling to manage congestion as well as to improve the network voltage stability margin. The Random Inertia Weight Particle Swarm Optimization (RANDIW-PSO) algorithm has been employed in this paper to obtain optimized solutions. The proposed methodology is tested on the New-England test system for different realistic scenarios. The results confirm a noteworthy decline in congestion cost along with the improvement in network voltage stability margin. Moreover, system performance has been improved in terms of system power losses, increased reactive power reserve at generators and voltage profile.

scholarly journals Voltage stability analysis using STATCOM

2021 ◽  
Author(s):  
Umang Patel
Keyword(s):  
Power System ◽  
Power Control ◽  
Voltage Stability ◽  
Reactive Power ◽  
Stability Margin ◽  
Power System Stability ◽  
System Stability ◽  
Transmission Network ◽  
Voltage Stability Margin ◽  
Three Phase

Power system stability is gaining importance because of unusual growth in power system. Day by day use of nonlinear load and other power electronics devices created distortions in the system which creates problems of voltage instability. Voltage stability of system is major concerns in power system stability. When a transmission network is operated near to their voltage stability limit it is difficult to control active-reactive power of the system. Our objectives are the analysis of voltage stability margin and active-reactive power control in proposed system which includes model of STATCOM with aim to analyse its behavior to improve voltage stability margin and active-reactive power control of the system under unbalanced condition. The study has been carried out using MATLAB Simulation program on three phase system connected to unbalanced three phase load via long transmission network and results of voltage and active-reactive power are presented. In future work, we can do power flow calculation of large power system network and find the weakest bus of the system and by placing STATCOM at that bus we can improve over all stability of the system

scholarly journals A modal analysis based on reactive power compensation on 6-bus Oman electrical grid

2021 ◽  
Vol 12 (2) ◽  
pp. 757
Author(s):  
Adnan Saif Al Mamari ◽  
Siti Fauziah Toha ◽  
Salmiah Ahmad ◽  
Ali Salim Al Mamari
Keyword(s):  
Modal Analysis ◽  
Reactive Power ◽  
Stability Margin ◽  
Electrical System ◽  
Peak Period ◽  
Electrical Grid ◽  
Capacitor Banks ◽  
Voltage Stability Margin ◽  
Eigen Values ◽  
Analysis Application

This paper covers the modal analysis application (MATLAB 2019a) for improving the voltage profiles by optimum positioning of the capacitor banks for 6-bus Oman Electrical System because the Oman electricity TransmissionCompany (OETC) is suffering of drop voltage in these 6 buses especially during summer season as a peak period. The Newton-Raphson (N-R) method will help to determine the required reactive power for each load bus and as well the ideal position or point of capacitors. The process aims to maintain the Q-V relations of the electrical grid by correlating the lowest Eigen-values to related Eigen-vectors in obtained Jacobian matrix. It depends on the Eigen-values, if they are positive then the system’s voltage is stable otherwise it is not stable. In a stable system, the potential voltage collapse could be anticipated by checking the participation factors for a group of minimal positive Eigen-values. In general, the critical weak bus is associated with lowerEigen-values. Electrical system collapse is attributable to the weakest bus in the network and it could be avoided by determining the weak buses and providing capacitor banks at suitable locations which will lead to improve the voltage stability margin.

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