A Two-Transformer Substation with a Common Dual-Band Controlled Voltage Regulator

The article addresses matters related to improving the efficiency and reliability of power supply systems built on the basis of shop two-transformer substations. A mechanical voltage regulator of the OCTC type, which has known disadvantages, is a weak link in the transformers of such substations. It is proposed to install a common dual-band controlled voltage regulator before the primary windings of transformers, implemented on the basis of reactor-thyristor controlled switches. To evaluate the effectiveness of the proposed solution, a number of numerical experiments were carried out in stationary and dynamic operation modes of the electrical network and shop transformers of the substation. A simulation model of a two-transformer substation with 1000 kV•A, 6/0.4 kV transformers with one common dual-band reactor-thyristor controlled voltage regulator was developed for the study. By using the developed MATLAB model, it is possible to carry out studies with simulating a decrease in the power supply voltage and fluctuations of the active-inductive load current. The results obtained have confirmed the effectiveness of the proposed technical solution. The use of a dual-band reactor-thyristor controlled regulator makes it possible to perform smooth and accurate voltage regulation, thereby improving the power supply system reliability and the quality indicators of electricity supplied to the consumer.