scholarly journals Active Hybrid Solid State Transformer Based on Multi-Level Converter Using SiC MOSFET

Energies ◽  
2018 ◽  
Vol 12 (1) ◽  
pp. 66 ◽  
Author(s):  
Chun-gi Yun ◽  
Younghoon Cho
Keyword(s):  
Solid State ◽  
Power Flow ◽  
Voltage Drop ◽  
Renewable Energy Sources ◽  
Current Control ◽  
Oxide Semiconductor ◽  
Prototype System ◽  
Solid State Transformer ◽  
Multi Level ◽  
Level Converter

As the types of loads have been diversified and demand has increased, conventional distribution transformers are difficult to maintain the constant voltage against voltage drop along with distance, grid voltage swell/sag, and various loads. Also, it is hard to control the power flow when connecting renewable energy sources. Active hybrid solid state transformer (AHSST) is application to keep the voltage and power quality. AHSST is a system that combines conventional distribution transformer and converter. Accordingly, it can be applied directly to distribution infrastructure and it has both the advantages of solid state transformer (SST) and conventional transformer. AHSST is capable of active voltage and current control and power factor control. It has a simpler structure than SST and it can perform the same performance with the lower rating converter. This paper presents two stage AHSST system based on multi-level converter. The converter is composed of the back-to-back converter using silicon carbide (SiC) metal-oxide semiconductor field effect transistor (MOSFET). Proposed system has a wider voltage and power flow control range, lower filter size, and simpler control sequence than existing AHSST systems. The performance of the proposed system was verified by prototype system experiments.

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

Energies ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4607
Author(s):  
Sebastian Stynski ◽  
Marta Grzegorczyk ◽  
Cezary Sobol ◽  
Radek Kot
Keyword(s):  
Solid State ◽  
Control Algorithm ◽  
Power Flow ◽  
Low Voltage ◽  
Control Strategies ◽  
Current Control ◽  
Renewable Energy Resources ◽  
Solid State Transformer ◽  
Voltage Transformer ◽  
Current Harmonics

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.

scholarly journals Solid State Transformers Topologies, Controllers, and Applications: State-of-the-Art Literature Review

Electronics ◽  
2018 ◽  
Vol 7 (11) ◽  
pp. 298 ◽  
Author(s):  
Ahmed Abu-Siada ◽  
Jad Budiri ◽  
Ahmed Abdou
Keyword(s):  
Solid State ◽  
Power Flow ◽  
Swot Analysis ◽  
Reactive Power ◽  
State Of The Art ◽  
Renewable Energy Sources ◽  
Electrical Energy ◽  
Modular Construction ◽  
Switching Speed ◽  
Power Semiconductors

With the global trend to produce clean electrical energy, the penetration of renewable energy sources in existing electricity infrastructure is expected to increase significantly within the next few years. The solid state transformer (SST) is expected to play an essential role in future smart grid topologies. Unlike traditional magnetic transformer, SST is flexible enough to be of modular construction, enabling bi-directional power flow and can be employed for AC and DC grids. Moreover, SSTs can control the voltage level and modulate both active and reactive power at the point of common coupling without the need to external flexible AC transmission system device as per the current practice in conventional electricity grids. The rapid advancement in power semiconductors switching speed and power handling capacity will soon allow for the commercialisation of grid-rated SSTs. This paper is aimed at introducing a state-of-the-art review for SST proposed topologies, controllers, and applications. Additionally, strengths, weaknesses, opportunities, and threats (SWOT) analysis along with a brief review of market drivers for prospective commercialisation are elaborated.

Review on the Development of Solid State Transformer

2021 ◽  
pp. 119-126
Author(s):  
Bharat Bhushan Khare ◽  
Rajeev Shankar Pathak ◽  
Sanjeev Sharma ◽  
Vinod Kumar Singh
Keyword(s):  
Solid State ◽  
Smart Grid ◽  
Energy Distribution ◽  
Power Flow ◽  
Electric Energy ◽  
Global Market ◽  
Transformer Oil ◽  
Solid State Transformer ◽  
Solid State Transformers ◽  
Compact Size

According to future renewable electric energy distribution and management (FREEDM) system, solid state transformers play an important role in smart grid technologies. They have several advantages over conventional transformers such as bi-directional power flow, light in weight, compact size, etc. They also compensate the environmental issues which are created due to transformer oil. Because of various advantages over traditional transformer, SST is preferred widely at the present time. So in this chapter, the various architectures, needs, and applications of solid state transformers are discussed. The global market of SST has continuously improved because it has several applications and benefits.

Surveying Solid-State Transformer Structures and Controls: Providing Highly Efficient and Controllable Power Flow in Distribution Grids

2020 ◽  
Vol 14 (1) ◽  
pp. 56-70 ◽  
Author(s):  
Felipe Ruiz ◽  
Marcelo A. Perez ◽  
Jose R. Espinosa ◽  
Tomasz Gajowik ◽  
Sebastian Stynski ◽  
...  
Keyword(s):  
Solid State ◽  
Power Flow ◽  
Solid State Transformer ◽  
Highly Efficient ◽  
Distribution Grids

Application of Multi-Level Converter for Fast Current Control in Small-Scale DC Power Network

2019 ◽  
Vol 55 (3) ◽  
pp. 2902-2909
Author(s):  
Masaya Katayama ◽  
Tatsuki Ohno ◽  
Hidemine Obara ◽  
Atsuo Kawamura
Keyword(s):  
Current Control ◽  
Small Scale ◽  
Power Network ◽  
Dc Power ◽  
Multi Level ◽  
Level Converter

scholarly journals Design of Three Phase Solid State Transformer Deployed within Multi-Stage Power Switching Converters

2019 ◽  
Vol 9 (17) ◽  
pp. 3545 ◽  
Author(s):  
Umair Tahir ◽  
Ghulam Abbas ◽  
Dan Glavan ◽  
Valentina Balas ◽  
Umar Farooq ◽  
...  
Keyword(s):  
Solid State ◽  
Power Flow ◽  
Harmonic Distortion ◽  
Iron Core ◽  
Switching Frequency ◽  
Switching Converters ◽  
Renewable Energy Resources ◽  
Solid State Transformer ◽  
Power Switching ◽  
Bidirectional Power Flow

This paper presents a symmetrical topology for the design of solid-state transformer; made up of power switching converters; to replace conventional bulky transformers. The proposed circuitry not only reduces the overall size but also provides power flow control with the ability to be interfaced with renewable energy resources (RESs) to fulfill the future grid requirements at consumer end. The proposed solid-state transformer provides bidirectional power flow with variable voltage and frequency operation and has the ability to maintain unity power factor; and total harmonic distortion (THD) of current for any type of load within defined limits of Institute of Electrical and Electronics Engineers (IEEE) standard. Solid state transformer offers much smaller size compared to the conventional iron core transformer. MATLAB/Simulink platform is adopted to test the validity of the proposed circuit for different scenarios by providing the simulation results evaluated at 25 kHz switching frequency.

HVDC bidirectional power flow using solid state transformer

2017 ◽  
Author(s):  
Yu Jianyang ◽  
Muhammad Qasim Khan ◽  
Zhang Yanwen ◽  
Muhammad Mansoor Khan ◽  
Muhammad Ali
Keyword(s):  
Solid State ◽  
Power Flow ◽  
Solid State Transformer ◽  
Bidirectional Power Flow
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