Hybrid transformer with power exchange capability in DC link for use in distribution network

Document Type : Original Article

Authors

Department of Electrical Engineering, Lorestan University, Khorramabad, Iran

Abstract

This paper presents a promising distribution post for the construction of a future active distribution network by designing a hybrid transformer with the ability to connect to DC microgrids. The topology of the proposed smart distribution substation consists of a direct power converter and a line frequency transformer. The combination of these two is introduced as a hybrid transformer. The main aim of designing a smart distribution substation with a DC link is to achieve power exchange between renewable energy sources (solar cells) and the distribution network, and as a result, adjust the voltage sag/swell and control the reactive power of the distribution network by means of the power electronics converter. The designed smart distribution substation uses a two-stage direct power converter with space vector modulation, which is connected to the distribution network through a series transformer. In the two-stage direct power converter, it is possible to connect to the DC microgrid. The steady state and dynamic performance of the proposed system have been confirmed by computer simulation and experimental results by prototype. These results prove the efficiency of the smart distribution substation in combining AC/DC networks and increasing the controllability and intelligence of the distribution network. It is also effective in correcting the power factor with the help of the DC link and as a result reducing the capacitor bank in the MV substation and also adjusting the voltage of the LV network.

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TABRIZ JOURNAL OF ELECTRICAL ENGINEERING

Articles in Press, Corrected Proof
Available Online from 21 October 2024

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