Abstract
Nowadays, many power electronics converters (PECs) are connected to the distribution grid, increasing the energy quality requirements in point of common coupling (PCC). One of the promising solutions to improve the energy quality is a smart transformer (ST) characterised by additional benefits in relation to the classical transformer throughout the possibility to implement advanced functionalities in PCC. However, the ST contains a lot of power semiconductor switches, making a problem for simulation software and the computer hardware when the control algorithm and all the ST functionalities are investigated. Usually, the solver algorithms in simulation software are used to create many linear time-varying states spaces, which increases exponentially with the number of switches. Therefore, very important is a model averaging process of the selected advanced ST topology, which is the aim of the paper. The proposed ST average model is compared with full switching models of each ST power conversion stage. It allows for decreasing the simulation time a dozen times, enabling the control algorithm analysis with a full ST model. The proposed solution and results prove steady-state and dynamic behaviour of the average model and provide a comprehensive averaging process for a novel multiple active bridge direct current/direct current (DC/DC) converter inside the ST.
Highlights
The transformer is one of the most important devices in transmission and distribution grids
The proposed average model of the advanced Smart Transformer (ST) with wye-delta HF transformer has been verified in simulation research
Since the full switching model is difficult to simulate and the attempts to conduct the full model analysis could not be completed with available hardware listed in Table 1 and used software (PLECS), the advantages of the described model have been studied for separated ST power conversion stages
Summary
The transformer is one of the most important devices in transmission and distribution grids. Tocontrolled conduct an efficient the advanced power electronics devices, such as ST, a by the voltage andanalysis current of sources, which replaces all switching elements. Good practice can is the design of for andozens average model for converters, the analysed circuit It is the simulation be performed of signal power electronics taking into [4,10,11]. The average model design technicsofare well electronics known in the literaturetaking for single consideration a converters complex control algorithm and significantly decreasing simulation time in power electronic included in all ST power stages 2020, 13,paper, 4613 a more advanced average model of the ST is proposed, taking into consideration this all dynamic behaviours of the real devices, neglecting only switching frequency influences on the measured voltage and currents. Using that relation, is obtained, obtained,as: as: Using that relation,the thereferenced referencedcurrent currentvalue value for for CCS
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