APPLICATION OF COMPUTER FOR SOLUTIONS OF ELECTRICAL LOAD·FLOW STUDIES IN ELECTRICAL POWER SYSTEM

Abstract

ABSTRACT load study is the determination of the voltage, current and power factor or reactive power at arious points on electric network under existing or contemplated conditions of normal operation. _oad studies are essential in planning the future development of the system because satisfactory peration of the system depends on knowing the effects of inter-connections with other power ystem of new loads, new generating stations and new transmission lines before they are installed. efore the development of large digital computers, load-flow studies were made on calculating oards, which provided small-scale single-phase replicas of actual systems by inter-connecting ircuit elements and voltage sources. Setting up the connections, making adjustments and reading e data was tedious and time consuming. Digital computers now provide the solutions of loadow studies on complex systems. ·his project discussed two methods by which load-flow problems can be solved using digital omputer. The two methods are the Gauss-Seidel method and the Newton-Raphson method espectively. -he Gauss-Seidel method requires more number of iterations for convergence to take place ompare with the Newton-Raphson method. he project also considered how computer can be used to control the output of each plant and unit within a plant which is a common practice in a power-system operation termed matic generation control}. By continually monitoring all plant outputs and the power flowing in ·ons, inter-changing of power with other system is controlled. he print out of results provided by the computer consist of a number of tabulations. Usually the ost important information to be considered first is the table which lists each bus number and bus-voltage magnitude in per unit and phase angle, generation and load at each bus in egawatts and megavars. Line charging and megavars of static capacitors or reactors on the bus. totals of system generation and loads are listed in megawatts and megavars, the tabulation bed is shown in appendix B, being the output of the program. v