APPLICATION OF THE FAST NEWTON-RAPHSON ECONOMIC-DISPATCH AND REACTIVEPOWER VOLTAGE DISPATCH BY SENSITIVITY FACTORS TO OPTIMAL POWER-FLOW

This paper applies the sensitivity factor method to the reactive power /voltage dispatch problem and combines it with the fast Newton-Raphson economic dispatch to solve the optimal power flow problem. The advant age of this method is that it is fast and reliable. Firstly, the real power generalized generation shift distribution (GGSD) factors are use d in economic dispatch to find the real power generation for every uni t so that the fuel cost is minimum. During the process of solving the economic dispatch problem, the voltage magnitudes of load buses in a p ower system may be changed and may exceed the ranges of secure values. Therefore, reactive power sensitivity factors of bus voltage magnitud es are used to regulate the voltage magnitudes of load buses to the se cure ranges. The process is repeated to find the optimal generation wi th all voltages staying within the secure ranges. Results show that th e algorithm converges very fast.