Post-fault operation of hybrid DC-DC converter for Solid-State Transformer

Gajowik, Tomasz; Sobol, Cezary; Styński, Sebastian; Malinowski, Mariusz

doi:10.1109/iecon.2017.8216931

Cited by 9 publications

(10 citation statements)

References 14 publications

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“…Secondly, with a proper DC-MV to DC-LV converter topology, it can achieve a higher freedom degree of a post fault operation. Especially a three-phase topology of a dual active bridge (DAB) converter with input parallel output parallel (IPOP) connection to the SMs-as shown in Figure 3-is most suitable [22,23]. If a failure in one SM cell occurs, or even if the whole DAB fails, the failed SM can be bypassed.…”

Section: Converter Topologies For the Mv-ac To Mv-dc Stage Of The Sstmentioning

confidence: 99%

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

et al. 2021

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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.

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Section: Converter Topologies For the Mv-ac To Mv-dc Stage Of The Sstmentioning

confidence: 99%

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

et al. 2021

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“…e SST circuit is composed of two or more static converters isolated by a transformer that operates at frequency considerably higher than the conventional 50/60Hz. e SST concept is as represented in Figure 5 [8].…”

Section: Concept Of Sst Was Rst Discovered In 1968 Bymentioning

confidence: 99%

“…In addition, the LFT is associated with bulky size and heavy weight. ese disadvantages, coupled with the fact that the emerging grid in electric power system requires new functionalities, controllability and exibility from the distribution make the LFT undesirable [8]. ese and many more constraints of LFT permit researchers to conclude that the conventional transformer cannot effectively meet up with challenges of modern grid [4].…”

Section: Introductionmentioning

confidence: 99%

Glance into solid-state transformer technology: a mirror for possible research areas

Umar

Jibril²,

Jimoh³

et al. 2020

J. Appl. Mat. Tech.

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Solid-State Transformer (SST), a power electronics based transformer is an emerging technology in electric power system. The transformer is being investigated to completely replace existing Line/Low Frequency Transformer (LFT). SST is composed of either of the two topologies: AC-DC-AC, two steps approach; or AC-AC, single-step approach. The two steps approach consists of three stages: AC-DC; DC-DC; and DC-AC stages. The DC-DC stage is made up of a boost DC-DC converter, a DC-AC inverter and a High Frequency Transformer, HFT. Therefore, SST performs the tasks of LFT by means of power electronic converters and HFT. The main essence of SST is to provide solution to the problem of bulkiness and heaviness of the LFT in the power distribution network. This is with the view to providing reduction in construction cost, cost of maintenance and transportation. The power electronics transformer provides numerous advantages which are grouped into: The transformer has high power density; it functions in blackouts and brownouts; and it provides easy means of distributed renewable energy integration into associated grid. Therefore, this paper provides a glance into the technology of the SST for its better understating and promotion of research activities in the area.

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“…Additionally, a crucial part of the ST is a high-frequency (HF) transformer. Depending on the application and power electronics converters included in the ST, the significantly different HF transformers are designed and used [2,6,9]. Such an advanced power electronics device is a challenge in simulation research, caused by many switching elements, making the simulated circuit strongly non-linear.…”

Section: Introductionmentioning

confidence: 99%

The Enhanced Average Model of the Smart Transformer with the Wye-Delta Connection of Dual Active Bridges

Milczarek

Michna

2020

Energies

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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.

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Post-fault operation of hybrid DC-DC converter for Solid-State Transformer

Cited by 9 publications

References 14 publications

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

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

Glance into solid-state transformer technology: a mirror for possible research areas

The Enhanced Average Model of the Smart Transformer with the Wye-Delta Connection of Dual Active Bridges

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