Psoc

MAY/JUNE2006 PART-B 11(i) Explain the function of typical control system for frequency control of synchronous generator stating the function of each component? (ii)what are the system level and plant level controls? 12a)(i) Develop a schematic of speed governing system and explain its operation? (ii)Develop a linear mathematical model of a speed governing system? b)(i) Explain the technique involved in LFC of asingle area system? (ii)Explain the principle involved in the tie line frequency bias control in case of two area system? 13a)(i)explain the methodology of voltge control in an electrical power system develop a typical excitation arrangement for an alternator and explain? (ii)explain the function of static shunt compensation sketch wit diagram? b)(i) explain how voltage control can be achieved by the use of on load tap changer and off circuit tap changer? (ii)write briefly about static VAR system? 14a)explain the function and configuration of SCADA system wit diagram also list the common features of all SCADA system? b)list the various contingencies that are generally consider for steady state security analysis ,explain the major functions of system security control? 15a(i)explain the term incremental operating cost of power system related with economic dispatch? (ii)derive the coordination equation with losses? b)the fuel inputs /hr of unit 1 &2 are given by F1=(8p1+0.024p1^2+80)10^6 Btu/hr F2=(6p2+0.04p2^2+120)10^6 Btu/hr The maximum and minimum loads on the units are 100MW & 10MW respectively.determine the minimum cost of generation when the following load is supplied the cost of fuel is Rs2.5 per million Btu…

NOV/DEC 2004

11)page 1.11 example1.1&1.2 12)a(i) using a simplified functional diagram explain the operating feature of a speed governing system? (ii)explain the static and dynamic response of ALFC control loop? B(i)develop a linear mathematical model of two area system? (ii)explain the tie line bias control of two area system? 13a(i)develop a mathematical model of an excitor system and brief on its control action? (ii)static & dynamic performance of AVR loop? B(i)explain the different types of static VAR compensators with a phasor diagram? (ii)discss the effect of compensation on the maximum power transfer in atransmission line? 14a(i)explain the task of energy control center & its interaction with individual power plants? (ii)different functions of SCAdA system? B(i)classify & distinguish between the various operating states of power system? (ii)explain how the system states are continuously monitored and controlled? 15a(i) in a system of n generating units show that all individual controllable generator must operate at equal incremental production cost for optimum dispatch? (ii)significance of equality and inequality constraints in the formulation of economic dispatch problem? B) algorithm of n bus with losses?