JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Prerequisite

Computer Methods in Power Systems

Course Objectives

to prepare the students to

• Build the Nodal admittance and Nodal impedance matrices of a practical network.
• Study various methods of load flow.
• Analyse various types of faults in power system.
• Understand power system security concepts
• Understand state estimation and study simple algorithms for state estimation.

Course Outcomes

Students will be able to:

• 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, per unit system, 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-Siedel, Newton-Raphson load flow methods, fast decoupled method, 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 - Fault calculations using ZBUS equivalent circuits, Selection of circuit breakers, symmetrical components, 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.

TEXT BOOKS:

• 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. R19 M. TECH. EPE/EPS
• 3. A.J. Wood, “ Power generation, operation and control” , John Wiley, 1994.
• 4. P.M. Anderson, “Faulted power system analysis” , IEEE Press , 1995.
• 5. NPTEL Course, A. K. Sinha, Power System Analysis, https://www.youtube.com/playlist?list=PL36A60B630E8C7B56
• 6. Pradeep Yemula, Power System Practice, online course https://www.youtube.com/playlist?list=PL-uxPiMl0_6GWFPGXgVapb1yjVAZs9YGz R19 M. TECH. EPE/EPS M. TECH. I Year I Sem. (EPE/EPS)