Loss reduction of 220 kV substation with optimum reactive power management at 33 kV voltage level a case study

At present scenario, in Indian Power System shunt capacitor banks have been installed at 33 kV voltage level at EHV substations to compensate load reactive power demand. Capacity of installed shunt capacitors are not matching with load reactive power demand which results excessive reactive power flow on lines and transformers. Poor power factor of lines and transformers, results higher transmission losses, increased loading and poor voltage profile of the network. In this research paper case study of Rajasthan power system has been presented and studied to evaluate the impact of optimum reactive power management at 33 kV voltage level on transmission losses and other system parameters. 220 kV GSS Sri Dungargarh located in Churu district has been selected to carry out the detail studies. Actual system condition of 220 kV GSS Sri Dungargarh on 10
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September 2016 at 1.00 PM has been simulated in MiPower Software. Then additional shunt capacitor banks have been installed to reduce the reactive power flow on EHV lines and transformers and system is simulated again. Impact of optimal reactive management at 33 kV voltage level has been analyzed on transmission losses, lines and transformers loading and network voltage profile. From simulation studies it is found out that there is a significant saving in transmission losses with optimum reactive power management at 33 kV voltage level and cost of additional shunt capacitor banks is recovered in one year.