Abstract
The high penetration of new device technologies, such as Electric Vehicles (EV), and Distributed Generation (DG) in Distribution Networks (DNs) has risen new consumption requirements. In this context, it becomes crucial to implement a flexible, functional and fast responsive management of the voltage level and Reactive Power (RP) in the DN. The latest improvements in the Solid State Switches (SSS) field demonstrate they can be used as a Power Electronic (PE) converter. In particular, they have been shown to be capable of operating synchronously with transformers, making the Hybrid Distribution Transformer (HT) concept a potential and cost-effective solution to various DN control issues. In this paper, a HT-based approach consisting of augmenting the conventional Low Voltage (LV) transformer with a fractionally rated PE converter for regulating and controlling the RP in the last mile of the DN is proposed. In this way, it is expected to meet the demand of the future DN from an efficiency, controllability and volume perspective. The proposed approach is implemented using a back-to-back converter. In addition, a power transfer control topology is used to implement the proposed control of the RP injection that controls the voltage level at the Direct Current (DC) link. The proposed approach has been demonstrated in different load scenarios using the Piecewise Linear Electrical Circuit Simulation (PLECS) tool. The simulation results show that the proposed approach can compensate the loads with their need from RP instead of feeding them from the transmission grid at the primary side of the Distribution Transformer (DT). In this way, the proposed approach is able to decrease the transferred amount of RP in the transmission lines.
Highlights
IntroductionPublisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations
The ACinside of the converter converter is simulated operating under different loading scenarios order to assess the is simulated operating under different loading scenarios in order to assess the robustness robustness of the proposed approach
The parameter values for circuit configuration in the proposed approach *
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. The latest improvements in the field of Solid State Switches (SSS) suggest that using them as a Power Electronic (PE) converter can be a potential solution to modernise and harmonise Alternating Current (AC) and DC electrical networks [16,17] In this line, several approaches have been proposed in the literature using full rated converters, showing they are capable of adding a huge amount of functionalities and a high controllability to DTs. using full rated converters, usually located after or before the DT as a standalone device, yields high losses for switching and conduction as well as requiring high maintenance.
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