scholarly journals ANALISA WAKTU PEMUTUSAN KRITIS SUATU SISTEM KELISTRIKAN

2013 ◽  
Vol 12 (2) ◽  
pp. 153
Author(s):  
Nathaniel L Bijang
Keyword(s):  
Transient Stability ◽  
Electrical Power ◽  
Circuit Breaker ◽  
Transient Condition ◽  
Electrical Power System ◽  
Circuit Breakers ◽  
Voltage Level ◽  
Transfer Capability ◽  
Clearing Time ◽  
The Stability

ANALISA  WAKTU PEMUTUSAN KRITIS SUATU SISTEM KELISTRIKAN  ABSTRAK Kestabilan adalah kemampuan mesin sinkron dari sistem tenaga listrik untuk mencapai kondisi stabil pada kondisi operasi baru yang sama atau identik dengan kondisi sebelum terjadi gangguan. Umumnya analisa kestabilan terbagi dalam dua kategori yaitu kestabilan steady  state yaitu analisa sistem untuk kembali ke kondisi stabil setelah mengalami gangguan kecil dan kestabilan transient yaitu analisa sistem untuk kembali ke kondisi normal/stabil setelah mengalami gangguan besar. Studi/analisa stabilitas sangat diperlukan saat perencanaan pembangkit  dan transmisi.   Analisa/studi stabilitas  sistem tenaga listrik membantu untuk menentukan setting waktu on/off relai proteksi , waktu pemutusan kritis circuit breaker, level tegangan dan kapasitas transfer diantara sistem-sistem. Kata kunci: Mesin sinkron, stabilitas, waktu pemutusan kritis  CRITICAL CLEARING TIME ANALYSIS ELECTRICAL POWER SYSTEM ABSTRACT The stability problem is concerned with the behavior of the synchronous machines after  a disturbance. Transient stability studies are needed to ensure the system can withstand the transient condition following a major disturbance. Frequently,such studies are conducted when new generating and transmitting facilities are planned. The studies are helpful  in determining such things as the nature of the relaying system needed, critical clearing time of circuit breakers, voltage level of, and transfer capability between systems. Keywords: Synchronous machine, stability, critical clearing time

scholarly journals Improvement of Transient Stability Using Different-Different FACTS Devices

2020 ◽  
Vol 5 (2) ◽  
pp. 35-37
Author(s):  
Vipin Kumar Pandey ◽  
Dr. Malay S Das ◽  
Dr. Anula Khare
Keyword(s):  
Power System ◽  
Transient Stability ◽  
Electrical Power ◽  
Power Demand ◽  
Electrical Power System ◽  
Industrial Growth ◽  
Voltage Instability ◽  
Facts Devices ◽  
Transfer Capability ◽  
The Stability

Due to increase in population and industrial growth, insufficient energy resources to generate or transmit the power in power system, increase in load causes power demand in the electrical power system. These power demand leads to voltage instability, increase the losses, reduces the power transfer capability and stability of the power system. To overcome this stability problem FACTS devices are optimally located in the power system to examine the stability of the system. To locate the FACTS devices different optimization algorithms are used in order to improve the stability of the electrical power system.

scholarly journals The Transient Stability Study of a Synchronous Generator Based on the Rotor Angle Stability

2015 ◽  
Vol 5 (6) ◽  
pp. 1319 ◽  
Author(s):  
Selwa Fetissi ◽  
Djamel Labed ◽  
Imen Labed
Keyword(s):  
Transient Stability ◽  
Electrical Power ◽  
Circuit Breaker ◽  
Stability Study ◽  
Electrical Power System ◽  
Step Method ◽  
Clearing Time ◽  
Angle Stability ◽  
Rotor Angle ◽  
Rotor Angle Stability

Transient stability is an important aspect in the operation of electrical power system. In case of fault occurs in the system, the determining of fault clearing time of circuit breaker is considered one of the main factors to ensure power transfer of the system. This paper is aim to study the transient stability of single machine infinite bus system (SMIB), based on the rotor angle stability. The study is performed to determine the influence of the critical clearing time of the circuit breakers on the rotor angle stability of the generator in the case of three phase fault. For obtaining and determining numerically the nature of the rotor angle of machine, we applied the Step-by-step method for different values of fault clearing time. The results of simulation indicate that determine of critical clearing time is a major evaluation in stability studies. The system model is created in MATLAB/ SIMULINK software.

scholarly journals Analysis of Transient Stability in Synchronous Generator Using Nyquist Method

2018 ◽  
Vol 7 (4.44) ◽  
pp. 22
Author(s):  
Mohammad Noor Hidayat ◽  
Syarifatul Izza ◽  
Ratna Ika Putri
Keyword(s):  
Transient Stability ◽  
Electrical Power ◽  
Synchronous Generator ◽  
System Stability ◽  
Quality Analysis ◽  
Electrical Power System ◽  
Final State ◽  
Gain Margin ◽  
Two Factors ◽  
The Stability

There are two factors that must be considered for the power quality analysis of an electrical power system, i.e. frequency and voltage stability. The system that can return to the initial condition or the steady state after a disturbance occurred indicates that the system is stable. This paper aims to detect the transient stability of three generators, which have identical specification of 2.25 MW 6.6 kV and are operated in parallel, based on the frequency performance. In this paper, the stability analysis is determined by using the nyquist method, where the system stability is indicated by the value of the response curve of the system. The analysis results show that the system of three paralleled generators have the value that far from 1 + j0 and the phase margin value and gain margin tend to be minimum. These values indicate that the system is unstable. The system slowly changes into more unstable because the oscillations are getting bigger until the final state. So, it is necessary to change the parameters of each generator that can affect the system stability during synchronization state.   

scholarly journals Analyzing the impact of wind generation on the transient stability

2015 ◽  
Vol 18 (3) ◽  
pp. 86-91
Author(s):  
Binh Thi Thanh Phan ◽  
Thien Ngoc Ho
Keyword(s):  
Transient Stability ◽  
Circuit Breaker ◽  
Wind Generation ◽  
Power Network ◽  
Clearing Time ◽  
The Stability ◽  
The Impact

The wind generation causes some troubles on the stability of power network. Observing the critical clearing time of circuit breaker with existence of wind generation, one conclusion about the degrading of stability will be drawn. The location and the penetration level of this generation are also considered in this paper. The 14 buses IEEE network is examined with the soft ware PSAT.

Power Plant Station Protection System against Voltage Fluctuation

2015 ◽  
Vol 793 ◽  
pp. 65-69 ◽  
Author(s):  
Abadal Salam T. Hussain ◽  
Waleed A. Oraibi ◽  
Fadhel A. Jumaa ◽  
F. Malek ◽  
Syed F. Ahmed ◽  
...  
Keyword(s):  
Power Plant ◽  
Power System ◽  
Short Circuit ◽  
Electrical Power ◽  
Circuit Breaker ◽  
Digital Signal ◽  
Short Circuit Current ◽  
Electrical Power System ◽  
System Protection ◽  
Protective Relay

Electrical Power System protection is required to protectboth the user and the system equipment itself fromany fault, hence electrical power system is not allowed to operate without any protection devices installed. Power System fault is defined as the undesirable condition that occurs in the power system. Some of these undesirable conditions are short circuit, current leakage, ground faultand over-under voltage. With the increasing loads, voltages and short-circuit duty in power plant, over voltage protection has become more important today. Here, the component that had been used is PIC 16F877a microcontroller to control the whole system and especially on the circuit breakers as well as the LCT display unit is used to display the voltage level and type of generator that used to serve the load. Sensors are used to measure both thevoltage and the load. The controlled digital signal from PIC microcontroller is converted by using the digital analog converter to control the whole circuit. Thus a device called protective relay is created to meet this requirement. The protective relay is mostlyoften coupled with circuit breaker in a way that it can isolate the abnormal condition in the system.

Evaluation of Available Transfer Capability Using Transient Stability Constrained Line Flows

2014 ◽  
Vol 15 (1) ◽  
pp. 59-68
Author(s):  
Lazarus Okechukwu Uzoechi ◽  
Satish M. Mahajan
Keyword(s):  
Transient Stability ◽  
Direct Determination ◽  
Computation Time ◽  
Critical Energy ◽  
Energy Performance ◽  
Electric Power System ◽  
Available Transfer Capability ◽  
Transfer Capability ◽  
The Stability ◽  
The Impact

Abstract This paper presents a methodology to evaluate transient stability constrained available transfer capability (ATC). A linear and fast line flow–based (LFB) method was adopted to optimize the ATC values. This enabled the direct determination of the system source–sink locations. This paper formulated different market transactions considering bilateral and multilateral impacts in the stability constrained ATC. The proposed method was demonstrated on the WECC 9-bus and IEEE 39-bus systems. The critical energy performance index (CEPI) enabled the direct identification of candidates for contingency screening based on ranking. This index helped to reduce the list of credible contingencies for ATC evaluation and, therefore, the computation time. The results of the proposed ATC method are consistent with the literature and can be deployed for fast assessment of the impact of transactions in an electric power system.

Improvisation on Standard Limit of the Critical Clearing Time Specified for the Protection Relays Using one Machine Infinite Bus Equivalent

2015 ◽  
Vol 785 ◽  
pp. 343-347 ◽  
Author(s):  
Nur Ashida Salim ◽  
Muhammad Murtadha Othman ◽  
Ismail Musirin ◽  
Mohd Salleh Serwan
Keyword(s):  
Transient Stability ◽  
Mathematical Formulation ◽  
Circuit Breaker ◽  
Test System ◽  
System Stability ◽  
Time Interval ◽  
Clearing Time ◽  
Transient Instability ◽  
The One ◽  
One Machine

This paper presents a computationally accurate technique used to determine the critical clearing time using the one machine infinite bus equivalent system based on the equal area criterion. The critical clearing time is the maximum time interval by which the fault must be cleared in order to preserve the system stability. The computation of critical clearing time involves an intrinsic mathematical formulation derived from the pre-fault, during fault and post-fault conditions. The value of critical clearing time becomes significantly less when transient instability is induced by a three phase fault occurred at the bus bar closest to the substation connected with a sensitive generator. By setting the protection relay with the obtained value of critical clearing time, it is adequate to sustain the transient stability even though fault happened at the other locations. During the occurrence of fault, a circuit breaker which is operating earlier than the smallest critical clearing time will not agitate to a transient instability. The IEEE Reliability Test System 1979 (RTS-79) is used to verify the robustness of the methodology in a determining the critical clearing time.

Transient Stability Analysis of IEEE-9 Bus Electrical Power System

2017 ◽  
Vol 6 (4) ◽  
Author(s):  
Saurabh Kamble ◽  
◽  
Swarna Kanojiya ◽  
Yogita Male ◽  
Gaurav Ingale ◽  
...  
Keyword(s):  
Stability Analysis ◽  
Power System ◽  
Transient Stability ◽  
Electrical Power ◽  
Electrical Power System ◽  
Transient Stability Analysis

Modelling of TCSC Controller for Transient Stability Enhancement

2006 ◽  
Vol 7 (1) ◽  
Author(s):  
Ramnarayan Patel ◽  
Vasundhara Mahajan ◽  
Vinay Pant
Keyword(s):  
Power System ◽  
Power Flow ◽  
Transient Stability ◽  
Electrical Power ◽  
Fast Response ◽  
Transmission System ◽  
System Stability ◽  
Electrical Power System ◽  
Facts Controllers ◽  
Ac Transmission

Power engineers are currently facing challenges to increase the power transfer capabilities of existing transmission system. Flexible AC Transmission system (FACTS) controllers can balance the power flow and thereby use the existing power system network most efficiently. Because of their fast response, FACTS controllers can also improve the stability of an electrical power system by helping critically disturbed generators to give away the excess energy gained through the acceleration during fault. Thyristor controlled series compensator (TCSC) is an important device in FACTS family, and is widely recognized as an effective and economical means to solve the power system stability problem. TCSC is used as series compensator in transmission system. In the present work a TCSC controller is designed and tested over a single machine infinite bus (SMIB) as well as a multi-machine power system. Detailed simulation studies are carried out with MATLAB/SIMULINK environment and the effect of the TCSC parameter variations over the system stability is studied.

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