Current Control Strategies for a Star Connected Cascaded H-Bridge Converter Operating as MV-AC to MV-DC Stage of a Solid State Transformer

Sebastian Stynski, Marta Grzegorczyk, Cezary Sobol and Radek Kot
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Sebastian Stynski: Institute of Control and Industrial Electronics, Warsaw University of Technology, 00-662 Warsaw, Poland
Marta Grzegorczyk: Institute of Control and Industrial Electronics, Warsaw University of Technology, 00-662 Warsaw, Poland
Cezary Sobol: Institute of Control and Industrial Electronics, Warsaw University of Technology, 00-662 Warsaw, Poland
Radek Kot: Institute of Control and Industrial Electronics, Warsaw University of Technology, 00-662 Warsaw, Poland

Energies, 2021, vol. 14, issue 15, 1-17

Abstract: Nowadays, the increasing number of nonlinear loads and renewable energy resources pose new challenges for the standard electrical grid. Conventional solutions cannot handle most of them. The weakest component in the whole system is a conventional distribution (converting medium to low AC voltage) transformer. It should not operate with unbalanced, heavily distorted voltage and cannot control power flow or compensate current harmonics. One of the promising solutions to replace the conventional transformer and thus minimize power flow and grid distortions is a power electronics device called a solid state transformer (SST). Depending on the SST topology, it can have different functionalities, and, with the proper control algorithm, it is able to compensate any power imbalances in both low voltage (LV) and medium voltage (MV) grid sides. In the case of a three energy conversion stage SST, the LV and the MV stages can be treated separately. This paper focuses on the MV-AC to the MV-DC stage only based on a star-connected cascaded H-bridge converter. In this paper, a simple control solution for such a converter enabling different current control strategies to distribute power among the phases in an MV grid in the case of voltage imbalances is proposed. Simulation and experimental results proved good performance and verified the validity of the proposed control algorithm.

Keywords: solid state transformer; star connected cascaded H-bridge converter; current control; MV grid voltage imbalance (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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