Considering the turbine back-pressure effect of thermal units to optimize the PQ-power generation in power system

A new algorithm of PQ-power optimization is mentioned and some typical numerical examples are presented in this article. The fuel cost characteristics being obtained in form of superposition of some high order polynomial and sinusoidal functions can approximately simulate the turbine back-pressure effect the generator units at the electrical thermal stations and solve the problem of economic active power dispatch. A new loss factor formula expressing the network transmission power losses is a second order polynomial function of generator power containing a square matrix. This loss factor formula is proposed for optimum solution of generator reactive power in multi-machine power system. (author)