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.

scholarly journals An Accurate Method for Delay Margin Computation for Power System Stability

Energies ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 3466 ◽  
Author(s):  
Ashraf Khalil ◽  
Ang Swee Peng
Keyword(s):  
Time Delay ◽  
Power Systems ◽  
Power System ◽  
System Stability ◽  
Area Measurement ◽  
Power System Stabilizer ◽  
Iteration Algorithm ◽  
Measurement Units ◽  
System Stabilizer ◽  
Delay Margin

The application of the phasor measurement units and the wide expansion of the wide area measurement units make the time delay inevitable in power systems. The time delay could result in poor system performance or at worst lead to system instability. Therefore, it is important to determine the maximum time delay margin required for the system stability. In this paper, we present a new method for determining the delay margin in the power system. The method is based on the analysis in the s-domain. The transcendental time delay characteristics equation is transformed to a frequency dependent equation. The spectral radius is used to find the frequencies at which the roots cross the imaginary axis. The crossing frequencies are determined through the sweeping test and the binary iteration algorithm. A single machine infinite bus system equipped with automatic voltage regulator and power system stabilizer is chosen as a case study. The delay margin is calculated for different values of the power system stabilizer (PSS) gain, and it is found that increasing the PSS gain decreases the delay margin. The effectiveness of the proposed method has been proved through comparing it with the most recent published methods. The method shows its merit with less conservativeness and fewer computations.

scholarly journals State Estimation in Electric Power Systems Leveraging Graph Neural Networks

2022 ◽  
Author(s):  
Ognjen Kundacina ◽  
Mirsad Cosovic ◽  
Dejan Vukobratovic
Keyword(s):  
Power Systems ◽  
Power System ◽  
State Estimation ◽  
Electric Power Systems ◽  
State Variables ◽  
Evaluation Phase ◽  
Measurement Units ◽  
Synthetic Datasets ◽  
Graph Neural Networks ◽  
Test Scenarios

The goal of the state estimation (SE) algorithm is to estimate complex bus voltages as state variables based on the available set of measurements in the power system. Because phasor measurement units (PMUs) are increasingly being used in transmission power systems, there is a need for a fast SE solver that can take advantage of PMU high sampling rates. This paper proposes training a graph neural network (GNN) to learn the estimates given the PMU voltage and current measurements as inputs, with the intent of obtaining fast and accurate predictions during the evaluation phase. GNN is trained using synthetic datasets, created by randomly sampling sets of measurements in the power system and labelling them with a solution obtained using a linear SE with PMUs solver. The presented results display the accuracy of GNN predictions in various test scenarios and tackle the sensitivity of the predictions to the missing input data.

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.

scholarly journals Optimal Placement and Sizing of SVC for Improving Voltage Profile of Power System

2011 ◽  
pp. 146-150
Author(s):  
Shraddha Udgir ◽  
Sarika Varshney ◽  
Laxmi Srivastava
Keyword(s):  
Power Systems ◽  
Power System ◽  
Capital Investment ◽  
Reactive Power ◽  
Test System ◽  
Vital Role ◽  
Optimal Location ◽  
Optimal Placement ◽  
Voltage Profile ◽  
Stability Margins

In emerging electric power systems, increased transactions often lead to the situations where the system no longer remains in secure operating region. The flexible AC transmission system (FACTS) controllers can play a vital role in the power system security enhancement. However, due to high capital investment, it is necessary to place these controllers optimally in a power system. FACTS devices can regulate the active and reactive power control as well as adaptive to voltage-magnitude control simultaneously because of their flexibility and fast control characteristics. Placement of these devices at optimal location can lead to control in line flow and maintain bus voltages in desired level and so improve voltage profile and stability margins. This paper proposes a systematic method for finding optimal location of SVC to improve voltage profile of a power system. A contingency analysis to determine the critical outages with respect to voltage security is also examined in order to evaluate the effect of SVC on the location analysis. Effectiveness of the proposed method is demonstrated on IEEE 30-bus test system.

Improvement of large power system with facts devices placement to maxim-IZE the system load ability

2018 ◽  
Vol 7 (2.28) ◽  
pp. 381
Author(s):  
O L. Bekri ◽  
F Mekri
Keyword(s):  
Power Systems ◽  
Power System ◽  
New England ◽  
Power Flow ◽  
Voltage Stability ◽  
Optimal Placement ◽  
Test Case ◽  
Static Synchronous Compensator ◽  
Large Power ◽  
Loading Parameter

Voltage instabilities and/or collapses have been recognized as one of the major causes of power system blackouts. The main objective of this paper is to provide some solutions to prevent large power systems from voltage collapse. The FACTS (Flexible AC Transmission Sys-tems) devices placement gives new opportunities for enhancing voltage stability. The calculation of the loadability point is based on the con-tinuation power flow technique (CPF) to choosing the optimal placement of STATCOM (Static Synchronous Compensator) in order to improve voltage stability by increasing the loading parameter, maintaining bus voltages at desired level and minimizing losses in a power system network.A 39-bus New England power system is chosen as test case in order to illustrate this approach. The obtained results show the efficiency of the proposed method for the planning of the Static Synchronous Compensator optimal placement and the voltage stability enhancement.  

scholarly journals Bi-Objective Optimization Model for Optimal Placement of Thyristor-Controlled Series Compensator Devices

Energies ◽  
2019 ◽  
Vol 12 (13) ◽  
pp. 2601
Author(s):  
Mohammad Reza Salehizadeh ◽  
Mahdi Amidi Koohbijari ◽  
Hassan Nouri ◽  
Akın Taşcıkaraoğlu ◽  
Ozan Erdinç ◽  
...  
Keyword(s):  
Power Systems ◽  
Power System ◽  
Electricity Market ◽  
Weather Conditions ◽  
Congestion Management ◽  
Optimal Placement ◽  
Novel Approach ◽  
Simulation Results ◽  
Increasing Demand ◽  
Thyristor Controlled Series Compensator

Exposure to extreme weather conditions increases power systems’ vulnerability in front of high impact, low probability contingency occurrence. In the post-restructuring years, due to the increasing demand for energy, competition between electricity market players and increasing penetration of renewable resources, the provision of effective resiliency-based approaches has received more attention. In this paper, as the major contribution to current literature, a novel approach is proposed for resiliency improvement in a way that enables power system planners to manage several resilience metrics efficiently in a bi-objective optimization planning model simultaneously. For demonstration purposes, the proposed method is applied for optimal placement of the thyristor controlled series compensator (TCSC). Improvement of all considered resilience metrics regardless of their amount in a multi-criteria decision-making framework is novel in comparison to the other previous TCSC placement approaches. Without loss of generality, the developed resiliency improvement approach is applicable in any power system planning and operation problem. The simulation results on IEEE 30-bus and 118-bus test systems confirm the practicality and effectiveness of the developed approach. Simulation results show that by considering resilience metrics, the performance index, importance of curtailed consumers, congestion management cost, number of curtailed consumers, and amount of load loss are improved by 0.63%, 43.52%, 65.19%, 85.93%, and 85.94%, respectively.

FACT Controllers and their Optimal Location: An Extensive Review

2020 ◽  
Vol 13 (8) ◽  
pp. 1206-1216
Author(s):  
Hanuman P. Agrawal ◽  
Hariom Bansal
Keyword(s):  
Power Systems ◽  
Power System ◽  
Dynamic Control ◽  
Optimal Location ◽  
Optimal Placement ◽  
Extensive Review ◽  
Flexible Ac Transmission ◽  
Flexible Ac Transmission System ◽  
Ac Transmission ◽  
Power System Performance

Background: The power industry has been evolving continuously and influenced by a competitive deregulated market. The crucial demand to maximize the efficiency of the existing equipment requires it’s proper management. Flexible AC Transmission System (FACTS) are flexible devices, which provide dynamic control over the power system to cope with its dynamic nature. Methods: An extensive review is carried out on FACT devices covering its classification, importance, optimal placement and influence on the power systems. Results: In this paper, different techniques to identify the optimal location of placing FACT devices have been discussed and compared, as the placement of these devices in the power system is of utmost importance for its efficiency. Conclusion: This paper summarizes techniques available for optimal placement of FACTS devices in order to improve power system performance. It will serve as a ready reference for the future researchers in this field and help them in selecting the proper devices to carry out their work.

Analisis Gangguan Pada Sistem Tenaga Listrik Jawa Bali 500 kV Menggunakan Power World Simulator

2019 ◽  
Vol 10 (1) ◽  
pp. 35-41
Author(s):  
Dwi Ajiatmo ◽  
Imam Robandi ◽  
Machrus Ali ◽  
Betta Aidya Suroya
Keyword(s):  
Power Systems ◽  
Power System ◽  
Electric Power ◽  
Power Distribution ◽  
Short Circuit ◽  
Electric Power Systems ◽  
Electric Power System ◽  
Positive Sequence ◽  
Simulation Design ◽  
Component System

Short circuit is one type of interference that often occurs in electric power systems. The interference if it lasts a long time will affect the quality and continity of electrical power distribution as well as the reliability and safety of the equipment on the system. To minimize the possibility of interference and to minimize the consequences caused by interference, an analysis of disturbances in the electric power system is needed. This study discusses the classification and analysis of disturbances in the electric power system. The type of interference in the electric power system is classified into two, namely symmetry and non-symmetrical interference. Symmetry disturbances are three phase disturbances which are described by the equation of the sequence of the symmetry component system. Sequence equations from the symmetry component system are positive sequence equations, negative sequence equations, and zero sequence equations. Non-symmetrical interference is a disorder that often occurs in electric power systems, namely the interference of one network to the ground, network interference to the network and interference of two networks to the ground. This research is to classify and to analyze the types of disturbances in the Java-Bali electric power system 500 kV 20 buses in the form of a single line diagram, using Power World Simulator and ETAP Software applications. The simulation results are calculated and display the simulation design of the power system with the tools contained in the program.

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