Determination of Static Voltage Load Characteristics in BiH Electricity System

Abstract

From 2015 to 2016, the Independent System Operator in Bosnia and Herzegovina (ISO BiH) performed periodic measurements in 26 substations 110/x kV, separately in winter and summer regimes. Power transformer tap changer positions were experimentally shifted in order to determine static load characteristics of complex consumer areas, ie. to determine self-regulating consumption coefficients that demonstrate the load change (in percentage) when the voltage changes by 1%. Experiments with changing different transmission ratios were realized in real exploitation conditions in BiH power system, whereby in the process of reducing the voltage, special care was taken about the security of supply of the most remote consumers. Reducing the voltage can be implemented as a system service, when there is a shortage of active power throughout the power system, or locally, as a result of problems in one part of the system, in order to provide the required level of safety and to avoid voltage collapse of the power system. The complete study and its accompanying measurements and results can be found in [1].