Д. Земський: ORCID 0000-0003-4322-0727; В. Сиченко: ORCID 0000-0002-9533-2897; Д. Босий: ORCID 0000-0003-1818-2490

Моделювання сумісної роботи систем зовнішнього та тягового електропостачання залізниць змінного струму для оцінки якості електроенергії у несиметричних режимах

Nowadays, the quality of electrical energy really needs to be improved especially for industrial purposes that require a good level of reliability in the distribution of electrical energy. Maintenance of distribution transformers is routinely carried out to ensure that the quality of electrical energy produced is in accordance with standards. This maintenance is done using the customer’s load from the distribution transformer to the mobile substation transformer, that can be done using synchronization. This synchronization requires the same distribution transformer vector groups, otherwise it will produce non-standard output. The aim of this research is to determine the vector groups effect on parallel transformer installation system, the method to overcome the synchronous problem of different vector groups based on simulating and testing the synchronization of a 20 / 0.4 kV distribution transformer with the Dyn5 and Dyn11 vector groups. The results obtained from this research are two transformers that have different vector groups can be synchronized with an abnormal connection (changing the position of the secondary terminal cable connection and the primary terminal cable) so that it will produce the same voltage phase. This will abnormal treatment of distribution transformers maintenance that do not have a back-up transformer with the same vector group still can use the different vector group transformers.

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Distribution Transformer Synchronization Simulation with Two Different Vector Groups using the Matlab Simulink

Distribution Transformer Synchronization Simulation and Implementation with Dyn5 and Dyn11 Vector Groups using the MATLAB Simulink and TTR Test

The article is devoted to the experiment, what was performed on the local distribution networks with poor power quality. As a rule, these networks are subsystem of AC traction power supply system, and their design causes voltage unbalance and other power quality problems in consumers. Often, the network is powered by transformers with different vector groups, therefore their parallel operation is impossible. The purpose of the experiment is to assess the effect on energy quality of a regime with sources on both sides. The quality of electrical energy was estimated, considerable attention is devoted to unbalance voltage. Using the statistics methods measurement data are studied. During the experiment, the energy quality improved when the parallel mode was used. The concept of smart grid has been proposed to reduce energy losses for dynamic power management.

Denys R. Zemskyi

Papers

Energy Efficient Modes of Distribution Power Supply Systems with Different Vector Group of Transformer