ANALYSIS OF DIFFERENT CONSTRUCTIONS OF DYNAMIC REACTIVE POWER COMPENSATORS, USED IN THE TRACTION SUBSTATIONS OF THE RAILWAY TRANSPORT IN BULGARIA

Georgi Dimitrov; Todor Lalev

Scientific paper ID 2271 : 2022/3

ANALYSIS OF DIFFERENT CONSTRUCTIONS OF DYNAMIC REACTIVE POWER COMPENSATORS, USED IN THE TRACTION SUBSTATIONS OF THE RAILWAY TRANSPORT IN BULGARIA

Georgi Dimitrov, Todor Lalev

Transport activities on the national railway infrastructure of the Republic of Bulgaria are carried out with over 240 electric locomotives and electric multiple-unit train trains /EMU/. More than 75% of them are with DC drives, fed through a step-down transformer and non-controlled or controlled rectifiers. This type of electric rolling stock is a significant consumer of reactive power and emits higher harmonics of the current in the traction network. On the other side the 25 kV, 50 Hz overhead contact system of railway transport has a significant capacitive conductivity, and is a generator of reactive capacitive power. All these features the use in traction substations of specialized equipment to compensate for reactive power, with the aim of improving the quality of traction power consumption from the power system.

The report presents an analysis of dynamic compensators of reactive power installed in the traction substations of the railway transport in Bulgaria, which differ in terms of construction and principle of operation. On the basis of energy measurements of different types of locomotives, an assessment of the necessary compensating reactive power has been made. A study was made on the effectiveness of reactive power compensation for different models of compensators installed in some typical traction substations. The results are presented in tabular and graphical form and appropriate conclusions are formulated.

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Електрифициран железопътен транспорт Тягови подстанции Динамични компенсатори на реактивна мощност Сравнителен анализ.Electrified railway transport Traction substations Dynamic reactive power compensators Comparative analysis.Georgi Dimitrov Todor Lalev

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