26-03-2011, 12:48 PM
Presented by.
Nishyandana.M
Swapna Sree.B
Veena.R
[attachment=11062]
Transient Stability Analysis On n-bus System
ABSTRACT
• In this project a program for handling the Transient stability of an electrical power system network is developed.
• With the growing stress on today’s power systems, many utilities increasingly face the threat of transient stability problems.
• The project analysis can be divided into two programs:
1. Load Flow Program
2. Transient Stability Program
• It contains solution of swing equation by Point by Point method .
• Finally we run the source code using the MATLAB software and plot the graphs for delta vs. time and then from the given system we tell the state of the system.
Introduction
• Stability:
The stability of an interconnected power system is its ability to return to normal or stable operation after having been subjected to some form of disturbance.
• Importance Of Stability:
Stability considerations have been recognized as an essential part of power system planning.
• For the purpose of analysis power system stability can be classified as :
1. Steady State Stability
2.Dynamic Stability
3.Transient Stability
Load Flow Studies
• The flow of active and reactive power is called ‘Power Flow’ Or ‘Load Flow’.
• Definition Of Load Flow Studies:
It is defined as the computational procedure required to determine the operating characteristics of a power system networks.
• Importance Of Load Flow Studies:
1.Easy to analyze
2.Plan for extension
3.Use as initial conditions
• Different Methods Of Load Flow Analysis:
1.Gauss-Seidel Method
2.Newton-Raphson Method
3.Fast Decoupled Load Flow Method
In our project analysis we make use of ‘Gauss-Seidel Method’ due to following advantages:
1.Simplicity of technique
2.Less memory requirement
3.Less time per iteration
Transient Stability Analysis
• Definition: A synchronous power system has ‘Transient Stability’ if ,after a large sudden disturbance, it can regain and maintain synchronism.
• Importance Of Transient State Stability:
Transient stability analysis has recently become a major issue in the operation of power system due to the increasing the stress on power system networks.
• Stability study of n-bus system is simpler when carried out on a
“ DIGITAL COMPUTER”
• The result obtained from load flow analysis is taken as initial condition for transient stability analysis.
• The load flow study is carried out on n-bus system.
Swing Equation:
The power system has rotating synchronism machines, in order to know whether the system is stable or not, it is necessary to derive ‘Swing Equation’
M( d2δ / dt2) = Pm – Pe
M( d2δ / dt2) = Pm – Pmax Sin δ
• The Swing Curves are used to get the critical clearing time.
• Usually, we write the Swing Equation at 3 instants
1.Pre Fault
2.During Fault
3.Post Fault
• For solving the problem we write the Swing Equation for ‘during fault’ and ‘post fault’ which can be solved by Point by Point method.
Nishyandana.M
Swapna Sree.B
Veena.R
[attachment=11062]
Transient Stability Analysis On n-bus System
ABSTRACT
• In this project a program for handling the Transient stability of an electrical power system network is developed.
• With the growing stress on today’s power systems, many utilities increasingly face the threat of transient stability problems.
• The project analysis can be divided into two programs:
1. Load Flow Program
2. Transient Stability Program
• It contains solution of swing equation by Point by Point method .
• Finally we run the source code using the MATLAB software and plot the graphs for delta vs. time and then from the given system we tell the state of the system.
Introduction
• Stability:
The stability of an interconnected power system is its ability to return to normal or stable operation after having been subjected to some form of disturbance.
• Importance Of Stability:
Stability considerations have been recognized as an essential part of power system planning.
• For the purpose of analysis power system stability can be classified as :
1. Steady State Stability
2.Dynamic Stability
3.Transient Stability
Load Flow Studies
• The flow of active and reactive power is called ‘Power Flow’ Or ‘Load Flow’.
• Definition Of Load Flow Studies:
It is defined as the computational procedure required to determine the operating characteristics of a power system networks.
• Importance Of Load Flow Studies:
1.Easy to analyze
2.Plan for extension
3.Use as initial conditions
• Different Methods Of Load Flow Analysis:
1.Gauss-Seidel Method
2.Newton-Raphson Method
3.Fast Decoupled Load Flow Method
In our project analysis we make use of ‘Gauss-Seidel Method’ due to following advantages:
1.Simplicity of technique
2.Less memory requirement
3.Less time per iteration
Transient Stability Analysis
• Definition: A synchronous power system has ‘Transient Stability’ if ,after a large sudden disturbance, it can regain and maintain synchronism.
• Importance Of Transient State Stability:
Transient stability analysis has recently become a major issue in the operation of power system due to the increasing the stress on power system networks.
• Stability study of n-bus system is simpler when carried out on a
“ DIGITAL COMPUTER”
• The result obtained from load flow analysis is taken as initial condition for transient stability analysis.
• The load flow study is carried out on n-bus system.
Swing Equation:
The power system has rotating synchronism machines, in order to know whether the system is stable or not, it is necessary to derive ‘Swing Equation’
M( d2δ / dt2) = Pm – Pe
M( d2δ / dt2) = Pm – Pmax Sin δ
• The Swing Curves are used to get the critical clearing time.
• Usually, we write the Swing Equation at 3 instants
1.Pre Fault
2.During Fault
3.Post Fault
• For solving the problem we write the Swing Equation for ‘during fault’ and ‘post fault’ which can be solved by Point by Point method.