scholarly journals A GENETIC BASED TECHNIQUE FOR THE DETERMINATION OF POWER SYSTEM TOPOLOGICAL OBSERVABILITY

2014 ◽  
pp. 16-21
Author(s):  
S. Vazquez-Rodriguez ◽  
R. J. Duro
Keyword(s):  
Genetic Algorithms ◽  
Power Systems ◽  
Power System ◽  
Spanning Tree ◽  
Point Of View ◽  
Genetic Operators ◽  
Building Process ◽  
Phenotype Transformation

In this paper we have addressed the problem of observability of power systems from the point of view of topological observability and using genetic algorithms for its determination. The objective is to find a way to determine if a system is observable by establishing if a spanning tree of the system that verifies certain properties with regards to the use of available measurements can be obtained. To this end we have developed a genotype-phenotype transformation scheme for genetic algorithms that permits using very simple genetic operators over integer based chromosomes which after a building process can become very complex trees. The procedure was successfully applied to standard benchmark systems and we present some results for one of them.

BASIN CONFIGURATION OF A SIX-DIMENSIONAL MODEL OF AN ELECTRIC POWER SYSTEM

2002 ◽  
Vol 12 (06) ◽  
pp. 1333-1356 ◽  
Author(s):  
YOSHISUKE UEDA ◽  
HIROYUKI AMANO ◽  
RALPH H. ABRAHAM ◽  
H. BRUCE STEWART
Keyword(s):  
Power Systems ◽  
Power System ◽  
Initial Conditions ◽  
Electrical Power ◽  
Practical Importance ◽  
Intervention Strategy ◽  
Basins Of Attraction ◽  
Electric Power System ◽  
Point Of View ◽  
Electrical Power System

As part of an ongoing project on the stability of massively complex electrical power systems, we discuss the global geometric structure of contacts among the basins of attraction of a six-dimensional dynamical system. This system represents a simple model of an electrical power system involving three machines and an infinite bus. Apart from the possible occurrence of attractors representing pathological states, the contacts between the basins have a practical importance, from the point of view of the operation of a real electrical power system. With the aid of a global map of basins, one could hope to design an intervention strategy to boot the power system back into its normal state. Our method involves taking two-dimensional sections of the six-dimensional state space, and then determining the basins directly by numerical simulation from a dense grid of initial conditions. The relations among all the basins are given for a specific numerical example, that is, choosing particular values for the parameters in our model.

scholarly journals Determination of Critically Objects of Electric Power Systems from the Position of Energy Security

2018 ◽  
Vol 58 ◽  
pp. 03009 ◽  
Author(s):  
Dmitry Krupenev
Keyword(s):  
Power Systems ◽  
Power System ◽  
Electric Power ◽  
Energy Security ◽  
Electric Power Systems ◽  
Time Interval ◽  
Factors Affecting ◽  
Interconnected Power System ◽  
The Given

The paper deal the problem of definition and ranking of critical objects (CO) in electric power systems (EPS). The identification of the CO is necessary for the timely adoption of measures to organize the provision of the required level of energy security of the region where the object is location. The adequacy model is used for determine the critical objects of EPS, within the framework of which the simulation of the functioning of EPS during the given time interval is carried out, taking into account the main random factors affecting its operation. Approbation of the proposed approach is presented on the interconnected power system.

scholarly journals Reserves of Generating Capacity for Perspective Planning of Development of the Unified Energy System of Russia

2020 ◽  
Vol 209 ◽  
pp. 06015
Author(s):  
Dmitry Krupenev ◽  
Denis Boyarkin ◽  
Dmitrii Iakubovskii ◽  
Gennady Kovalev ◽  
Ludmila Lebedeva
Keyword(s):  
Power Systems ◽  
Power System ◽  
Electric Power ◽  
Electric Power Industry ◽  
Energy System ◽  
Power Industry ◽  
Generating Capacity ◽  
Perspective Planning

Determination of reserves of generating capacity is one of the main tasks in planning the future development of electric power systems. There are many problems that affect the rational level of redundancy of generating capacities in Russian power industry. Modern changes in the Russian electric power industry concerning the level of redundancy of generating capacity in the long-term planning of the development of the Unified Power System (UPS) of Russia are analyzed in the article. The optimization problem of determining the necessary reserves of generating capacity in the power system, based on the assessment of adequacy, taking into account the modern features of the development of the UPS of Russia is presented. The results of assessing the adequacy of the UPS of Russia at the level of 2022 and the value of the optimized reserves of generating capacity in the UPS of Russia are showed in the final part.

scholarly journals A Spanning Tree Approach in Placing Multi-channel and Minimum Channel PMU’s for Power System Observability

2015 ◽  
Vol 5 (3) ◽  
pp. 518
Author(s):  
Srihari Mandava ◽  
Vanishree J ◽  
Ramesh V
Keyword(s):  
Power Systems ◽  
Power System ◽  
Spanning Tree ◽  
Optimal Placement ◽  
Positive Sequence ◽  
Tree Search ◽  
Search Technique ◽  
Measurement Units ◽  
Novel Concept ◽  
Tree Approach

Synchronized phasor measurements have become the measurement technique of choice for electric power systems. They provide positive sequence voltage and current measurements synchronized to within a microsecond. The objective is to use the spanning tree approach and tree search technique for optimal placement of multichannel and minimum channel synchronized phasor measurement units (PMUs) in order to have full observability of Power System. The novel concept of depth of observability is used and its impact on the number of PMU placements is explained.  The spanning tree approach is used for the power system graphs and a tree search technique is used for finding the optimal location of PMUs. This is tested on IEEE-14 and IEEE-30 bus system. The same technique is modified to optimally place minimum channel PMUs on the same IEEE-14 and IEEE-30 bus systems. Matlab tool has been used for fulfilling the objective.

A SysML based hybrib photovoltaic-wind power system model

2017 ◽  
Vol 1 (2) ◽  
pp. 1
Author(s):  
Doudou Nanitamo Luta ◽  
Atanda K. Raji
Keyword(s):  
Power Systems ◽  
Power System ◽  
Wind Power ◽  
Systems Engineering ◽  
System Modeling ◽  
Point Of View ◽  
Modeling Language ◽  
Wind Power System ◽  
And Behavior ◽  
Model Based Systems Engineering

This paper presents a model of hybrid photovoltaic-wind power system based on SysML (System Modeling Language) which is a modeling language in supports to Model Based Systems Engineering (MBSE) practices. MBSE refers to a formalized procedure of systems development through the application of modeling principles, methods, languages and tools to the complete lifetime of a system.  Broadly speaking, the modeling of power systems is performed using software such as Matlab/Simulink, DigSilent, PowerWorld, ETAP, etc. These tools allow modeling considering a particular point of view depending on the objective that is to be assessed. SysML offers different aspects ranging from specifications and requirements, structure and behavior. This study focuses more specifically on the structural and behavioral modeling of hybrid photovoltaic-wind system; the main objective is to demonstrate the use of SysML in power systems’ modeling by developing models capturing the system’s major requirements, the structure and connection between entities, the interaction between stakeholders and the system itself and lastly, the system’s behavior in terms of transition between states.

scholarly journals Reduction of Annual Operational Costs in Power Systems through the Optimal Siting and Sizing of STATCOMs

2021 ◽  
Vol 11 (10) ◽  
pp. 4634
Author(s):  
Oscar Danilo Montoya ◽  
Jose Eduardo Fuentes ◽  
Francisco David Moya ◽  
José Ángel Barrios ◽  
Harold R. Chamorro
Keyword(s):  
Power Systems ◽  
Power System ◽  
Reactive Power ◽  
Programming Model ◽  
Operating Cost ◽  
Mathematical Optimization ◽  
System Optimization ◽  
Point Of View ◽  
Mixed Integer ◽  
Annual Operating Cost

The problem of the optimal siting and placement of static compensates (STATCOMs) in power systems is addressed in this paper from an exact mathematical optimization point of view. A mixed-integer nonlinear programming model to present the problem was developed with the aim of minimizing the annual operating costs of the power system, which is the sum of the costs of the energy losses and of the installation of the STATCOMs. The optimization model has constraints regarding the active and reactive power balance equations and those associated with the devices’ capabilities, among others. To characterize the electrical behavior of the power system, different load profiles such as residential, industrial, and commercial are considered for a period of 24 h of operation. The solution of the proposed model is reached with the general algebraic modeling system optimization package. The numerical results indicate the positive effect of the dynamic reactive power injections in the power systems on annual operating cost reduction. A Pareto front was built to present the multi-objective behavior of the studied problem when compared to investment and operative costs. The complete numerical validations are made in the IEEE 24-, IEEE 33-, and IEEE 69-bus systems, respectively.

scholarly journals Possibilities of using a superconducting energy storage in DC power systems of traction network

2018 ◽  
Vol 19 (6) ◽  
pp. 452-457
Author(s):  
Kamil Hebda ◽  
Marta Żurek-Mortka ◽  
Renata Repeć
Keyword(s):  
Energy Storage ◽  
Power Systems ◽  
Power System ◽  
Magnetic Energy ◽  
Industrial Applications ◽  
Point Of View ◽  
Superconducting Magnetic Energy Storage ◽  
Traction Network ◽  
Storage Technologies ◽  
Magnetic Energy Storage

Implementation of dynamic energy storage technology and its integration with the power system represents another important step in the development of the energy sector. This article discusses the advancement of superconducting energy storage technologies and the possibilities of their use in power engineering as well as other branches of industry. It also presents the perspective of applications of superconducting energy storage type SMES (Superconducting Magnetic Energy Storage) both for commercial and industrial applications and their impact on power grid. The article analyzes the functions that systems can use with the use of a superconductor in the power system. The functionality of SMES systems has been analyzed in particular from the point of view of its use in railways.

scholarly journals New Techniques for the Prevention of Power System Collapse

2013 ◽  
pp. 294-300
Author(s):  
Fouzul Azim Shaikh ◽  
Ramanshu Jain ◽  
Mukesh Kotnala ◽  
Nickey Agarwal
Keyword(s):  
Power Systems ◽  
Power System ◽  
Distribution System ◽  
Reactive Power ◽  
Low Voltage ◽  
Point Of View ◽  
Voltage Collapse ◽  
Transmission Grid ◽  
System Collapse ◽  
Stability Point

From voltage stability point of view, maximum permissible loading limits must not be exceeded in the operation of power systems. The risk of cascading outages in power systems manifests itself in a number of ways like loss of generation units, breaker failures, common tower and common right-of-way circuit outages, combination of system conditions and events. With the advent of structured competitive power markets, and with the lack of needed investment in the transmission grid, electric power systems are increasingly being operated close to their limits. When a power system is subjected to large disturbances control actions need to be taken to steer the system away from severe consequences and to limit the extent of the disturbance. The main factor, which causes these unacceptable voltage transients, is the inability of the distribution system to meet the demand for reactive power. The major research in dealing with voltage collapse is the proper diagnosis of the underlying factors causing low voltage. These disturbances often result in voltage collapse of the system, which in turn causes huge losses in the system as well as monetary losses. This paper deals with some newer techniques for the prevention of the voltage system collapse for voltage system collapse, which may have a very large economic impact on the society. It also focuses on right initiation at right time to ease control action to enhance stability, reliability and security of the power system so as to provide a preventive plan to minimize the chances of failure in power system as possible.

scholarly journals Distributed Sources Optimal Sites and Sizes Search in Large Power Systems

2021 ◽  
Author(s):  
Mustafa Mosbah ◽  
Redha Djamel Mohammedi ◽  
Salem Arif
Keyword(s):  
Genetic Algorithms ◽  
Power Systems ◽  
Power System ◽  
Optimization Technique ◽  
Active Network ◽  
Large Power ◽  
Distributed Source ◽  
Matlab Code ◽  
Safety Constraints ◽  
Network Losses

The integration of renewable sources into the power system has now become an unavoidable necessity for these technical and economic advantages and for the protection of the environment. In this chapter, a study is given for the integration of the Distributed Source (DS) in an optimal way and this by looking for the best location (sites) and the best power to be injected (size). The optimization technique used is based on genetic algorithms under technical and safety constraints, with the aim of minimizing active network losses and maximizing voltage stability. These objective functions are handled as a single and multi-objective problem. This study is applied on the standard IEEE 30 bus network under the MATLAB code.

Transient Torque of Steam Turbines in Power Systems

1970 ◽  
Vol 185 (1) ◽  
pp. 641-653
Author(s):  
G. Sheard ◽  
F. J. Evans
Keyword(s):  
Power Systems ◽  
Power System ◽  
Steam Turbine ◽  
Transient Stability ◽  
Time Lag ◽  
Point Of View ◽  
Transient Condition ◽  
Steam Turbines ◽  
Exponential Time ◽  
Turbine Model

Techniques for the calculation of the transient torque of a steam turbine following step and ramp type displacements of throttle valves are developed. The objective is an improvement in steam turbine representation for digital and other studies of electric power systems under disturbed conditions, including transient stability. The turbine model used as a building block for the transient theory is a length of pipe, representing loop pipe or reheat boiler, followed by a multi-stage turbine. The theory of unsteady flow of compressible fluids is applied to the problem and this, together with throttle, nozzle and steam turbine equations, allows the transient torque to be calculated. A digital computer programme has been developed which could be used as a sub-routine in an overall transient stability programme. The dominant transient feature is a transport lag and not an exponential time delay, as is commonly assumed. Moreover this transport lag, being associated with the local sonic velocity rather than the steam particle velocity, has a value about one-tenth of the usually assumed exponential time lag in mass-flow. Methods are indicated for extending the transient response obtained for the above turbine model to multi-cylinder turbines. The conclusion to be drawn is that, for any fast turbine control or transient condition (on a time-scale of seconds rather than tens of seconds), the conventional assumption of an exponential time constant will be substantially in error. Such fast disturbances will almost certainly have their origins on the power system side. It is from the power system point of view that this paper is written.

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