Study on total fault clearing time in digital substations

2021 ◽  
Author(s):  
Anamaria Iamandi ◽  
Iulia-Cristina Constantin ◽  
Costel Constantin ◽  
Nicoleta Arghira ◽  
Ioana Fagarasan ◽  
...  
Keyword(s):  
Clearing Time

Evaluación probabilística de la estabilidad transitoria considerando la incertidumbre de la demanda y gestión del riesgo

2018 ◽  
Vol 15 (1) ◽  
Author(s):  
Marlon Chamba ◽  
Walter Vargas ◽  
Jaime Cepeda
Keyword(s):  
Clearing Time

El presente artículo propone una metodología para evaluar el impacto de la incertidumbre de la demanda eléctrica, sobre la estabilidad transitoria del sistema con base en el análisis probabilístico del tiempo crítico de despeje de falla CCT (Critical Clearing Time).  El análisis probabilístico de estabilidad transitoria, permite establecer una función de densidad de probabilidad (PDF por sus siglas en inglés) del comportamiento del CCT. La PDF se calcula a partir de simulaciones de Montecarlo, donde, para cada escenario generado y contingencia, se evalúa el CCT. Para el cálculo del CCT se emplea el método de la bisección, variando el tiempo de duración de falla (

scholarly journals Dynamic grid fault analysis in wind power plant with DFIG by using supervisory control and data acquisition (SCADA) viewer

2020 ◽  
Vol 181 ◽  
pp. 03006
Author(s):  
Nduwamungu Aphrodis ◽  
Ntagwirumugara Etienne ◽  
Utetiwabo Wellars ◽  
Mulolani Francis
Keyword(s):  
Power Systems ◽  
Power Flow ◽  
Control Strategies ◽  
Electrical Power ◽  
Fault Analysis ◽  
Operational Mode ◽  
Electrical Power Systems ◽  
Fault Ride Through ◽  
Before And After ◽  
Clearing Time

Faults in electrical power systems are among the key factors and sources to network disturbances, however control strategies are among key faults clearing techniques for the sake of safe operational mode of the system.Some researchers have shown various limitations of control strategies such as slow dynamic response,inability to switch Off and On network remotely and fault clearing time. For a system with wind energy technologies, if the power flow of a wind turbine is interrupted by a fault, the intermediate-circuit voltage between the machine-side converter and line-side converter will fall in unacceptably high values.To overcome the aforementioned issues, this paper used a Matlab simulations and experiments in order to analyze and validate the results.The results showed that fault ride through (FRT) with SCADA Viewer software are more adaptable to the variations of voltage and wind speed in order to avoid loss of synchronism. Therefore at the speed of 12.5m/s a wind produced a rated power of 750W and remained in synchronization before and after a fault created and cleared but worked as generator meanwhile at speed of 3.4m/s wind disconnected from grid and started working as a motor and consumed active power (P=-25watts) and voltage dip at 100% .For the protection purpose, the DC chopper and crowbar should be integrated towards management of excess energy during faults cases.

Modified Critical Trajectory Algorithm to Determine the Critical Clearing Time for Unbalanced Fault

2021 ◽  
Author(s):  
Isa Hafidz ◽  
Ardyono Priyadi ◽  
Margo Pujiantara ◽  
Sjamsjul Anam ◽  
Naoto Yorino ◽  
...  
Keyword(s):  
Clearing Time

scholarly journals Enhancement the stability of power system using optimal location of FACTS devices

2020 ◽  
Vol 18 (2) ◽  
pp. 648
Author(s):  
Ali Najim Abdullah ◽  
Ahmed Majeed Ghadhban ◽  
Hayder Salim Hameed ◽  
Husham Idan Hussein
Keyword(s):  
Power Network ◽  
Performance Factors ◽  
Facts Devices ◽  
Clearing Time ◽  
Thyristor Controlled Series Capacitor ◽  
Overall Performance ◽  
Set Up ◽  
The Stability ◽  
And Control ◽  
Better Than

<p><span>This paper proposes a steady-state of the Static Var Compensator (SVC) &amp; Thyristor Controlled Series Capacitor (TCSC) set up for enhancing the damping overall performance and growing the integral clearing time (CCT) of a power network. The indispensable clearing time is carried out through increasing the time fault interval until the gadget loses stability. Increasing the CCT can be contribute to reliability of the safety gadget, decrease the protection machine ranking and cost. In order to attain most enhancement of machine stability via optimizing location, sizing and control modes of SVC and TCSC. Models and methodology for putting and designing shunt FACT’s units SVC (injected reactive strength Q) and series FACT’s devices TCSC (chose capacitive region) are examined in a 6-bus system. Performance factors are described to show validation of SVC and TCSC on extraordinary conditions. It is proven that the SVC is better than TCSC. </span></p>

scholarly journals Design of Optimal Power System Stabilizer Using ETAP

2012 ◽  
pp. 221-224
Author(s):  
Raja Nivedha. R ◽  
Sreevidya. L ◽  
V. Geetha ◽  
R. Deepa
Keyword(s):  
Power System ◽  
Optimal Power Flow ◽  
Transient Stability ◽  
Transient Behavior ◽  
Steel Plant ◽  
Power System Stabilizer ◽  
Optimal Power ◽  
Clearing Time ◽  
System Stabilizer ◽  
System Power

The main objective of this paper is to improve the critical clearing time of the Steel Plant 35 MW Turbo generator. In order to enhance the transient behavior of the system, Power System Stabilizer is added so that proper damping is done. Damping intra area and inter area oscillations are critical to optimal power flow and stability on a system. Power system stabilizer is an effective damping device, as they provide auxiliary control signals to the excitation system of the generator. Transient stability analysis was carried out for the Steel plant. The three phase to ground and line to ground fault was simulated. The critical clearing time was found to be more when Power System Stabilizer was added and when Power System Stabilizer was not added the critical clearing time has considerably reduced.

scholarly journals Lyapunov Analysis of Two Imbalanced Power System Areas

2021 ◽  
Vol 19 (3) ◽  
Author(s):  
Gilang Nugraha Putu Pratama ◽  
Adha Imam Cahyadi
Keyword(s):  
Lyapunov Function ◽  
Transmission Lines ◽  
Transient Stability ◽  
Analytical Tool ◽  
Necessary Condition ◽  
Lyapunov Analysis ◽  
Simultaneous Solution ◽  
Region Of Attraction ◽  
Admittance Matrix ◽  
Clearing Time

The transient stability is the capability of the system to preserve synchronism while being affected by large disturbances. It is a nonlinear problem that requires a simultaneous solution for many differential equations. Therefore, a thorough analysis is needed to resolve it. In this paper, we present the transient stability for multimachine under different fault cases and to analyze using the Lyapunov function. It serves as an analytical tool to determine the necessary condition to be stable. The system is stable as long as it is contained in the region of attraction. Meanwhile, the swing equation and reduced admittance matrix are used to model the system in three conditions, pre-fault, during the fault, and post-fault. The numerical simulations are conducted to verify that the synchronism can be preserved despite under faults on the transmission lines by achieving the critical clearing time.  

Sign in / Sign up

Export Citation Format

Share Document