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**Jawaharlal Nehru Technological University Anantapur (JNTU) College of Engineering (CEP), Pulivendula, Pulivendula, Andhra Pradesh, India - JNTUACEP**- 2 Topics
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LECTURE NOTES ON COMPUTER METHODS IN POWER SYSTEMS B.Tech III-II semester

CONTENTS (CHAPTER-WISE) Chapter 1 LINEAR GRAPH THEORY PART A: INCIDENCE AND NETWORK MATRICES • Definitions of important terms • Incidence matrices: Element node incidence matrix and Bus incidence matrix • Primitive networks and primitive network matrices • Performance of primitive networks • Frames of reference • Singular transformation analysis • Formation of bus admittance matrix by rule of inspection and singular transformation • Examples PART B: ZBUS BUILDING ALGORITHMS • • • • • Partial networks Addition of Branch and addition of Link Algorithms for formation of ZBUS for single phase systems Special cases without and with mutually coupled elements Deletion of an element, changing the impedance value of an element, etc. • Examples Chapter 2 LOAD FREQUENCY CONTROL • • • • • • Turbine speed governing system Modeling and block diagram representation of single area Steady state and dynamic response Area control error Two area load frequency control Examples 2

Chapter 3 LOAD FLOW STUDIES PART A: REVIEW OF SOLUTION OF EQUATIONS • • • • • Solution of linear, nonlinear and differential equations Importance of iterative methods Flow diagrams for the iterative methods Comparison of methods Examples PART B: BASIC LOAD FLOW ANALYSIS • • • • • • • • • • Classification of buses Importance of slack bus Static load flow equations Gauss Siedel Method: for systems with PQ, PV and Constrained PV buses Limitations of Gauss Siedel method Importance of acceleration factor Newton Raphson method in polar coordinates Concept of Jacobian matrix Comparison of load flow methods Examples PART C: ADVANCED LOAD FLOW ANALYSIS • • • • Decoupled load flow Fast decoupled load flow analysis Representation of TCUL transformers Examples Chapter 4 ECONOMIC OPERATION OF POWER SYSTEMS • • • Optimal distribution of loads within a plant Langrangian multipliers Transmission loss as a function of plant generation 3

• • • Determination of loss coefficients Automatic economic load dispatch Examples Chapter 5 TRANSIENT STABILITY STUDIES • • • • • • • • • • Basic Stability terms Swing Equation & Swing Curve Numerical solution of differential equations Modified Euler’s method Runge-Kutta IV order method Milne’s predictor corrector method Representation of synchronous machine, loads, etc. for TS studies Network performance equations Solution techniques and flow charts Examples EXPECTED PATTERN OF QUESTION PAPER One question each on chapter 2 and 4, and Two questions each on chapters 1, 3 and 5. Note: Five questions out of 8 are to be answered in full. TEXTS/ REFERENCES: 1. Stagg and El Abiad, Computer methods in power system analysis, MH. 2. MA Pai, Computer techniques in power Systems, TMH.. 3. K Umarao, Computer Techniques and Models in Power Systems, IK International Publishing House Pvt. Ltd., New Delhi. 4. RN Dhar, Computer techniques in power system operation and control. PREREQUISITE SUBJECTS: 1. Power System Analysis 2. Synchronous Machines 3. Numerical analysis 4

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