750 KV OVERHEAD LINE FROM SUBSTATION “ZAPORIZKA NPP” TO SUBSTATION “KAKHOVSKA” AND ITS INFLUENCE ON THE OPERATING REGIMES OF THE INTEGRATED POWER SYSTEM OF UKRAINE

Abstract

Trunk transmission lines are very important for every huge power system. Integrated Power System (IPS) of Ukraine is not an exception to the rule. Therefore, the intensive construction of new system-forming 750 kV lines are provided for in the development strategy of Ukrainian electrical power engineering. Expansion and growth of trunk lines will improve the operational reliability of IPS of Ukraine. The main aim of the present article is to determine the influence of 750 kV overhead line from substation “Zaporizka NPP” to substation “Kakhovska” on the operation regimes of the IPS of Ukraine. This line had to be built by the end of the previous century. But the line construction had been stopped in the 1992. The construction of 750 kV overhead line from substation “Zaporizka NPP” to substation “Kakhovska” has been resumed by the present time, because of next benefits. In the first place, this line will remove the restriction of output power level from Zaporizka NPP. In the second place, this line will improve the power supply reliability of Southern regions of Ukraine, essentially of Crimean power system. Also, 750 kV overhead line from substation “Kakhovska” to substation “Prymorska” are to be built for the power supply reliability improvement of Odessa region. All the calculations has been done in software package «КОСМОС». The results have shown that working 750 kV overhead line from substation “Zaporizka NPP” to substation “Kakhovska” reduces power losses by 22 MW or 3,40%. In optimized regime power losses has been reduced by 31 MW or 4,78%. Such a result leads to the economy of about 15 thousand hryvnias per hour or about 135,78 million hryvnias per year. Also, working line improves voltage profile of IPS of Ukraine.