Design and implementation of the control of an MMC-based solid state transformer

Implementation of the control of a Solid State Transformer (SST) is described in this paper. The SST topology considered is derived from a Modular Multilevel Converter (MMC), in which the cells have the capability to transfer (inject or drain) power. The MMC is combined with an isolation stage formed by Dual Active Bridges (DABs) and a DC/AC power converter. The resulting modular multiport power converter can connect both high voltage and low voltage AC and DC ports, providing isolation between the high voltage and the low voltage terminals, and with full control of the power flow. Implementation of the control of this power converter is not trivial, due to the large amount of power devices and sensors involved, and to the complexity of the control algorithms. Furthermore, the need to provide isolation among the different stages adds further concerns mainly related with cost. This paper discusses the configuration, selection of the required hardware, as well as implementation aspects for the control of the proposed SST topolog

Energization and Start-up of Modular Three-stage Solid State Transformers

Workshop on Control and Modeling for Power Electronics, COMPEL (9th, 2028, Padua

Auxiliary power supply based on a modular ISOP Flyback configuration with very high input voltage

This paper proposes a Flyback-based Input-Series Output-Parallel (ISOP) Auxiliary Power Supply (APS), intended to feed the control system of the cells of a Solid-State Transformer (SST). The SST topology is based on a modular Multiport Multilevel Converter (MMC). Energization of the cells auxiliary circuitry is not trivial due to the high voltages involved (tens of kV for the electric power distribution system), most of the commercially available control and driving circuitry not being usable due to the isolation requirements. It is possible to energize the control circuitry from an APS, connected to the cell capacitor voltage. However, in the SST under consideration, cells target DC voltage is in the range of 1.5kV to 2.5kV. Design of an APS capable of feeding the auxiliary circuitry from such high voltage and the required isolation is not trivial. A modular APS using autonomous Flyback converters in Continuous Conduction Mode (CCM) and based on commercial AC adapters is proposed in this paper. The solution is scalable and therefore applicable to cells with larger DC voltage

Flexible and Fault Tolerant Distributed Control Structures for Modular Power Electronic Transformers

This paper addresses the design and implementation of distributed control structures for Modular Power Electronic Transformers (PETs). Medium voltage modular PETs are characterized by a large count of controlled power devices (easily in the range of hundreds or even thousands) and strict isolation requirements, both between modules in the high-voltage side and between the primary and secondary sides of each module as well. Due to this, distributed control structures have significant advantages compared to centralized ones. However, design of the distributed control structure is not trivial. Energization and start-up of the PET, as well as the required reconfigurations in the event of a module failure, to maintain the PET operative, can be especially challenging in this case. This paper discusses potential flexible, fault tolerant distributed control structures for modular PETs. Performance of the proposed solutions is verified experimentall

Dinamización del aprendizaje de VHDL a través del Aprendizaje Basado en Proyectos en una asignatura de Máster

Congreso Universitario de Innovación Educativa En las Enseñanzas Técnicas, CUIEET (26º. 2018. Gijón

Start-up of modular three-stage SST

Seminario Anual de Automática, Electrónica Industrial e Instrumentación, SAAEI (25º. 2018. Barcelona