JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Prerequisite

Computer Methods in Power Systems

Course Objectives:

• To build the Nodal admittance and Nodal impedance matrices of a practical network.
• To study various methods of load flow and their advantages and disadvantages.
• To understand how to analyze various types of faults in power system.
• To understand power system security concepts and study the methods to rank the contingencies.
• To understand need of state estimation and study simple algorithms for state estimation.

Course Outcomes

After completion of the course, students will be able to:

• Build/construct YBUS and ZBUS of any practical network.
• Calculate voltage phasors at all buses, given the data using various methods of load flow.
• Calculate fault currents in each phase.
• Rank various contingencies according to their severity.
• Estimate the bus voltage phasors given various quantities viz. power flow, voltages, taps, CB status etc.

UNIT - I

NETWORK MATRICES Introduction, Bus Admittance Matrix, Network Solution, Network Reduction (Kron Reduction), YBUS structure and manipulation, Bus Impedance matrix, Methods to determine columns of ZBUS.

UNIT - II

LOAD FLOW STUDIES Overview of Gauss-Seidel, Newton-Raphson, Fast decoupled load flow methods, Convergence properties, Sparsity techniques, Handling Qmax violations in constant matrix, Inclusion in frequency effects, AVR in load flow, Handling of discrete variable in load flow.

UNIT - III

FAULT CALCULATIONS Symmetrical faults, Fault calculations using ZBUS, Equivalent circuits, Selection of circuit breakers, Unsymmetrical faults, Problems on various types of faults.

UNIT - IV

CONTINGENCY ANALYSIS Security Analysis: Security state diagram, Contingency analysis, Generator shift distribution factors, Line outage distribution factor, multiple line outages, Overload index ranking.

UNIT - V

STATE ESTIMATION Sources of errors in measurements, Virtual and Pseudo measurements, Observability concepts, tracking state Estimation, Weighted Least Square method, Bad Data detection and estimation.

TEXTBOOKS:

• 1. J.J. Grainger &W.D.Stevenson, “Power system analysis” , McGraw Hill, 2003.
• 2. A. R. Bergen & Vijay Vittal, “Power System Analysis”, Pearson, 2000.

REFERENCES:

• 1. L.P. Singh, “Advanced Power System Analysis and Dynamics”, New Age International, 2006.
• 2. G.L. Kusic, “Computer aided power system analysis”, Prentice Hall India, 1986.
• 3. A.J. Wood, “Power generation operation and control”, John Wiley, 1994.
• 4. P.M. Anderson, “Faulted power system analysis”, IEEE Press, 1995. M. Tech – I Semester L T P C 3 0 0 3