Synchrophasor-Assisted Prediction of Stability/Instability of a Power System

2013 ◽  
Vol 14 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Biman Kumar Saha Roy ◽  
Avinash Kumar Sinha ◽  
Ashok Kumar Pradhan
Keyword(s):  
Power System ◽  
New England ◽  
Electrical Power ◽  
Threshold Value ◽  
System Stability ◽  
Power Generator ◽  
Measurement Units ◽  
System Information ◽  
Bus Voltage

Abstract This paper presents a technique for real-time prediction of stability/instability of a power system based on synchrophasor measurements obtained from phasor measurement units (PMUs) at generator buses. For stability assessment the technique makes use of system severity indices developed using bus voltage magnitude obtained from PMUs and generator electrical power. Generator power is computed using system information and PMU information like voltage and current phasors obtained from PMU. System stability/instability is predicted when the indices exceeds a threshold value. A case study is carried out on New England 10-generator, 39-bus system to validate the performance of the technique.

Study on Serial MPPT Electrical Power System Stability for Space Application

2014 ◽  
Vol 1016 ◽  
pp. 441-445
Author(s):  
Wenl Li Lin ◽  
Zhi Gang Liu
Keyword(s):  
Power System ◽  
Electrical Power ◽  
System Stability ◽  
Space Application ◽  
Electrical Power System ◽  
Maximum Power Point ◽  
Point Tracking ◽  
Power Point Tracking ◽  
Bus Voltage ◽  
Power Point

Instability phenomena such as bus voltage fluctuations are occurred in serial MPPT(Maximum Power Point Tracking) electrical power system. To study the system stability, the system equivalent circuit models were built based on a serial MPPT unregulated bus electrical power system topology for space application. The small-signal equivalent analysis method and solving eigenvalues of state space equations method were adopted to perform stability analysis in two-domain control modes separately, from which the key conclusions were obtained.

scholarly journals Application of Auto-Switched Capacitor Bank to Mitigate Voltage Collapse Problem in Distribution System; A Case Study of Osogbo South –Western, Nigeria.

2018 ◽  
Vol 6 (07) ◽  
Author(s):  
Okelola, M. O.
Keyword(s):  
Power System ◽  
Power Supply ◽  
Distribution System ◽  
Reactive Power ◽  
Capacitor Bank ◽  
Electrical Power ◽  
System Stability ◽  
Switched Capacitor ◽  
Voltage Collapse

Exponential demand for electrical power supply caused by increased use of electricity at both domestic and industrial level pose threat to power system stability. The need to enhance power system with adequate compensation via reactive power supply becomes a necessity. This paper therefore presents application of auto-switched capacitor bank to mitigate voltage collapse problem; a case study of Osogbo South-Western, Nigeria. The proposed approach carefully design the correct size of capacitor required to supply the reactive power needed for compensation. The obtained values were used to model the power system. The modeled system was subjected to disturbances with a view to investigate its performance. The results obtained showed that the designed capacitor bank was able to stabilize the voltage on the line despite the heavy loads on the power system.

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.

An Intelligent Hybrid Model for Bus Load Forecasting in Electrical Short-Term Operation Tasks

2012 ◽  
pp. 540-562
Author(s):  
Ricardo Menezes Salgado ◽  
Takaaki Ohishi ◽  
Rosangela Ballini
Keyword(s):  
Power System ◽  
Hybrid Model ◽  
Electrical Power ◽  
Load Forecasting ◽  
Electrical Power System ◽  
Term Operation ◽  
Operating Load ◽  
Conventional Models ◽  
Safe Operating

The main objective of this chapter is to present a hybrid model for bus load forecasting. This approach represents an essential tool for the operation of the electrical power system and the hybrid model combines a bus clustering process and a load forecasting model. As a case study, the model was applied to the real Brazilian electrical system, and the results revealed a performance similar to that of conventional models for bus load forecasting, but about 14 times faster. The results are compatible with the safe operating load levels for the Brazilian electrical power system and have proved to be adequate for use in real operation tasks.

scholarly journals Comparasion of Different Configuration of Hybrid Electrical Power System – A Case Study of a Site in Peshawar

2020 ◽  
Vol 7 (08) ◽  
pp. 268-273
Author(s):  
Raheemullah Khan ◽  
◽  
Jehan Parvez ◽  
Abdur Rehman ◽  
Muhammad Ibrahim ◽  
...  
Keyword(s):  
Power System ◽  
Electrical Power ◽  
Electrical Power System ◽  
System A ◽  
A Site
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