The main objective of the course is to study the performance of a power system network under steady state and Transient conditions. This course introduces formation of Z bus and Y bus of a transmission line, power flow studies by various methods. It also deals with short circuit analysis and analysis of power system for steady state and transient stability.
UNIT –I Load flow Studies (Steady state Analysis)
Formation of Ybus for load flow studies, Necessity of Power Flow Studies – Data for
Power Flow Studies – Derivation of Static load flow equations – Load flow solutions using Gauss Seidel Method: Acceleration Factor, Load flow solution with and without PV buses, Algorithm and Flowchart. Numerical Load flow Solution for Simple Power Systems (Max.3Buses): Determination of Bus Voltages, Injected Active and Reactive Powers (Sample One Iteration only) and finding Line Flows/Losses for the given Bus Voltages. Newton Raphson Method in Rectangular and Polar Co-Ordinates Form: Load Flow Solution with or without PV Busses Derivation of Jacobian Elements, Algorithm and Flowchart. Decoupled and Fast Decoupled Methods. Comparison of Different Methods – DC load flow.
UNIT – II Short Circuit Analysis (Transient analysis)
Formation of ZBus: Partial network, Algorithm for the Modification of ZBus Matrix for addition element for the following cases: Addition of element from a new bus to reference, Addition of element from a new bus to an old bus, Addition of element between an old bus to reference and Addition of element between two old busses (Derivations and Numerical Problems).Modification of Z Bus for the changes in network (Problems)
Per Unit System of Representation. Per Unit equivalent reactance network of a three phase Power System, Numerical Problems. Symmetrical fault Analysis: Short Circuit
Current and MVA Calculations, Fault levels, Application of Series Reactors, Numerical Problems.
UNIT –III Short Circuit Analysis2 (Transient analysis)
Symmetrical Component Theory: Symmetrical Component Transformation, Positive,
Negative and Zero sequence components: Voltages, Currents and Impedances.
Sequence Networks: Positive, Negative and Zero sequence Networks, Numerical
Problems. Unsymmetrical Fault Analysis: LG, LL, LLG faults with and without fault impedance, numerical problems
UNIT –IV Power System Steady State Stability Analysis
Elementary concepts of Steady State, Dynamic and Transient Stabilities.
Description of: Steady State Stability Power Limit, Transfer Reactance, Synchronizing Power Coefficient, Power Angle Curve and Determination of Steady State Stability and Methods to improve steady state stability.
UNIT –V Power System Transient State Stability Analysis
Derivation of Swing Equation. Determination of Transient Stability by Equal Area
Criterion, Application of Equal Area Criterion, Critical Clearing Angle Calculation.
Solution of Swing Equation: Point by Point Method. Methods to improve Stability
Application of Auto Reclosing and Fast Operating Circuit Breakers