A Heuristic method for shunt compensation of power systems based on the concept of “Up-Hill” MVAR Flow

2016 ◽  
Author(s):  
B. Fardanesh ◽  
A. Iravani ◽  
M. Graham
Keyword(s):  
Power Systems ◽  
Heuristic Method ◽  
Shunt Compensation

A Practical Design of a Fuzzy SMES Controller Based on Synchronized Phasor Measurement for Interconnected Power Systems

2008 ◽  
Vol 9 (3) ◽  
Author(s):  
Sanchai Dechanupaprittha ◽  
Komsan Hongesombut ◽  
Masayuki Watanabe ◽  
Yasunori Mitani ◽  
Issarachai Ngamroo
Keyword(s):  
Fuzzy Logic ◽  
Power Systems ◽  
Power System ◽  
Heuristic Method ◽  
Oscillation Mode ◽  
Membership Functions ◽  
Control Rules ◽  
Phasor Measurement ◽  
Practical Design ◽  
Synchronized Phasor Measurement

Recently, fuzzy logic control has widely received attention in various power system applications, despite difficulties of obtaining its control rules and membership functions. Nowadays, power systems consist of multiple areas where load variations with abrupt changes always exist, and proper control rules and membership functions could hardly be achieved. This paper proposes a practical design of fuzzy logic controllers for superconducting magnetic energy storage (SMES) based on a wide area synchronized phasor measurement for enhancing the stability of an interconnected power system. Moreover, a heuristic method is applied for determining control rules and membership functions. The estimated model is determined via a simplified oscillation model for detection and assessment of an approximated inter-area oscillation mode. Finally, some simulation studies based on a two-area four-machine power system are carried out to examine the performance and effectiveness of the designed fuzzy SMES controller.

scholarly journals Tuning of Controllers in Power Systems Using a Heuristic-Stochastic Approach

Energies ◽  
2019 ◽  
Vol 12 (12) ◽  
pp. 2325
Author(s):  
Humberto Verdejo ◽  
Rodrigo Torres ◽  
Victor Pino ◽  
Wolfgang Kliemann ◽  
Cristhian Becker ◽  
...  
Keyword(s):  
Genetic Algorithm ◽  
Steady State ◽  
Tabu Search ◽  
Power Systems ◽  
Heuristic Method ◽  
Stochastic Approach ◽  
Interconnected System ◽  
Cost Of Energy ◽  
System Stabilizer ◽  
The Cost

A method is proposed to fit parameters of Power System Stabilizer controllers in electromechanical multimachine power systems. The use of the Non-dominated Sorting Genetic Algorithm II heuristic method and Tabu search is considered to be initial search criteria. These methods give an approximation of the values that define the controllers. Then, the stochastic approach was used to evaluate the behavior of the parameters found when considering the system’s response to the presence of random and self-sustained in-time disturbances that affect the response of the system under steady state. The stochastic approach allows the evaluation of the system’s response through the calculation of the cost of energy loss under steady state. The method is applied to two systems: a three-machine nine-busbar system, and the Interconnected System of the Greater North (Sistema Interconectado del Norte Grande) in Chile. For these systems, the proposed methodology effectively optimized the controllers and Tabu search was shown to have a better performance than the Non-dominated Sorting Genetic Algorithm II.

scholarly journals Enhanced GSA-Based Optimization for Minimization of Power Losses in Power System

2015 ◽  
Vol 2015 ◽  
pp. 1-13 ◽  
Author(s):  
Gonggui Chen ◽  
Lilan Liu ◽  
Shanwai Huang
Keyword(s):  
Power Systems ◽  
Power System ◽  
Reactive Power ◽  
Power Transmission ◽  
Search Algorithm ◽  
Gravitational Search Algorithm ◽  
Heuristic Method ◽  
Mixed Integer ◽  
Mixed Integer Nonlinear Optimization ◽  
Power Loss Reduction

Gravitational Search Algorithm (GSA) is a heuristic method based on Newton’s law of gravitational attraction and law of motion. In this paper, to further improve the optimization performance of GSA, the memory characteristic of Particle Swarm Optimization (PSO) is employed in GSAPSO for searching a better solution. Besides, to testify the prominent strength of GSAPSO, GSA, PSO, and GSAPSO are applied for the solution of optimal reactive power dispatch (ORPD) of power system. Conventionally, ORPD is defined as a problem of minimizing the total active power transmission losses by setting control variables while satisfying numerous constraints. Therefore ORPD is a complicated mixed integer nonlinear optimization problem including many constraints. IEEE14-bus, IEEE30-bus, and IEEE57-bus test power systems are used to implement this study, respectively. The obtained results of simulation experiments using GSAPSO method, especially the power loss reduction rates, are compared to those yielded by the other modern artificial intelligence-based techniques including the conventional GSA and PSO methods. The results presented in this paper reveal the potential and effectiveness of the proposed method for solving ORPD problem of power system.

scholarly journals A heuristic method for simultaneous tower and pattern-free field optimization on solar power systems

2015 ◽  
Vol 57 ◽  
pp. 109-122 ◽  
Author(s):  
E. Carrizosa ◽  
C. Domínguez-Bravo ◽  
E. Fernández-Cara ◽  
M. Quero
Keyword(s):  
Power Systems ◽  
Solar Power ◽  
Free Field ◽  
Heuristic Method

scholarly journals The initialization of initial generating equipment maintenance schedules while a heuristic method is used

2021 ◽  
Vol 29 (2) ◽  
pp. 6-23
Author(s):  
Pavel Yu. Gubin ◽  
Vladislav P. Oboskalov
Keyword(s):  
Power Systems ◽  
Heuristic Method ◽  
Directed Search ◽  
Equipment Maintenance ◽  
Maintenance Schedule ◽  
Normal Probability ◽  
Normal Probability Distribution ◽  
Feasible Solutions ◽  
Generating Equipment ◽  
Maintenance Schedules

Currently, heuristic methods based on iterative changing of feasible solutions set provide a perspective tool for generation equipment maintenance scheduling in power systems. Wherein effectiveness of a heuristic method depends significantly on the initial set of possible schedules or in other words quality of the method initialization. In this case, a widely used methodology of building the initial array of solutions on the basis of pseudorandom uniform generation of control variables seems to be only palliative way to access the problem. This paper proposes alternative initialization procedure drawing on the example of generating units maintenance planning with heuristic differential evolution method. The principle of this method is to get initial set of solutions utilizing normal probability distribution to generate pseudorandom deviations from the suboptimal maintenance schedule which is to be preliminarily formed using directed search method. Following this approach allows to improve probabilistic characteristics of resultant maintenance schedule in particular to decrease median value of an objective function and its coefficient of variation, and to maximize probability to get the combination of units outage moments completely suiting operational constraints.

scholarly journals Comparison of Estimated Power Transfer in Transmission Line With and Without Shunt Compensator Using Different Line Models

2020 ◽  
Vol 8 (6S) ◽  
pp. 107-112
Keyword(s):  
Power Systems ◽  
Transmission Line ◽  
Transmission Lines ◽  
Power Transfer ◽  
Voltage Profile ◽  
Line Model ◽  
Section Model ◽  
Shunt Compensation ◽  
Shunt Compensator

In power systems, compensation techniques are used to improve the power transfer capacity in the transmission lines. Controlling the voltage profile along the line helps to control the transmittable power and this is achieved through compensation techniques. In this paper, different line models are used for the estimated power transmitted in the line both with and without shunt compensation. It is observed that with the Bergeron line model and PI-section model the estimated power is higher compared to that with the series RL model both with and without shunt compensation. PSCAD is used for the simulation.

scholarly journals Power system reactive compensation: evaluation of expansion plans taking into account electromagnetic transient restrictions

2009 ◽  
Vol 20 (1) ◽  
pp. 63-71 ◽  
Author(s):  
Fabrício Silveira Chaves ◽  
Maria Helena Murta Vale
Keyword(s):  
Power Systems ◽  
Power System ◽  
Reactive Power ◽  
Short Circuit ◽  
Transient Behavior ◽  
Critical System ◽  
Electromagnetic Transient ◽  
Reactive Compensation ◽  
Definition Of ◽  
Shunt Compensation

In this paper, the authors present developments regarding Power System Capacitive Shunt Reactive Compensation and Voltage Control, with respect to Expansion Activities, in an Electromagnetic Transient context. The definition of the amount and location of shunt reactive compensation to be installed in power systems considers several aspects, as reactive power optimization, short circuit calculations, voltage stability and harmonic analyses, among others. Different alternatives must be evaluated, regarding their impact (positive and negative) to system behavior, in order to select the most adequate compensation. Expansion decision process usually does not include studies about the transient impact of reactive shunt compensation caused by switching operation. Traditionally, this is done only after expansion definition, when the detailed project is elaborated, mainly to prepare equipment specifications. In this paper, it is proposed an innovative procedure to include a technical evaluation of different shunt compensation based on a preview of the overvoltage and overcurrent values caused by the corresponding capacitors bank switching. The new methodology is designed to (i) indicate the critical system buses that must be carefully investigated, considering transient behavior, and (ii) promote the adequate shunt compensation adjust. The proposed procedure is detailed and results of its application in real systems are presented.

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