Turbogenerator losses dependence of reactive loads

Abstract

The new method for turbogenerator power losses determination is introduced in this paper. The method relies on the experimentally derived power losses versus power reactive power dependence using data recorded in characteristic operating points. The proposed procedure is illustrated on the example of turbogenerators 410 MVA (and 348 MW). The procedures and the results of power losses calculations are also given for purely active generator load and at different reactive load levels. The power losses difference at same active power levels and at different reactive power levels appears to be related to the reactive load. For the three different turbogenerators rated at 247 MVA (and 210 MW) 367 MVA (and 348 MW) 727 MVA (and 618 MW), the results of calculations and analysis of power losses functions from reactive loads are presented. It is shown that block generator-transformer power losses are reduced remarkably, when generators power factor increase up to 0.92 from 0.85. This presents an important argument for power factor correction improvement in EES EPS together with the fact that in this situation the rotation reserves have been increased. From 2005 to 2008 by installing 550 Mvar of new capacitors in distribution network, reactive power demand from generators has been reduced for 720 Mvar, and so power losses are reduced for 9 MW, only in generator-transformer blocks of total rated power of 3800 MW.