scholarly journals Resilient and Immune by Design Microgrids Using Solid State Transformers

Energies ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 3377 ◽  
Author(s):  
Mihai Sanduleac ◽  
João Martins ◽  
Irina Ciornei ◽  
Mihaela Albu ◽  
Lucian Toma ◽  
...  
Keyword(s):  
Solid State ◽  
Power System ◽  
New Technologies ◽  
Low Voltage ◽  
Distribution Networks ◽  
Electrostatic Energy ◽  
Time Interval ◽  
Solid State Transformers ◽  
Stability Point ◽  
Bulk Power

Solid State Transformers (SST) may become, in the near future, key technological enablers for decentralized energy supply systems. They have the potential to unleash new technologies and operation strategies of microgrids and prosumers to move faster towards a low carbon-based economy. This work proposes a paradigm change in the hierarchically and distributed operated power systems where SSTs are used to asynchronously connect the many small low voltage (LV) distribution networks, such as clusters of prosumers or LV microgrids, to the bulk power system. The need for asynchronously coupled microgrids requires a design that allows the LV system to operate independently from the bulk grid and to rely on its own control systems. The purpose of this new approach is to achieve immune and resilient by design configurations that allow maximizing the integration of Local Renewable Energy Resources (L-RES). The paper analyses from the stability point of view, through simplified numerical simulations, the way in which SST-interconnected microgrids can become immune to disturbances that occur in the bulk power system and how sudden changes in the microgrid can damp out at the Point of Common Coupling (PCC), thus achieving better reliability and predictability in both systems and enabling strong and healthy distributed energy storage systems (DESSs). Moreover, it is shown that in a fully inverter-based microgrid there is no need for mechanical or synthetic inertia to stabilize the microgrid during power unbalances. This happens because the electrostatic energy stored in the capacitors connected behind the SST inverter can be used for a brief time interval, until automation is activated to address the power unbalance for a longer term.

Low Voltage Bulk Power System Restoration Simulation

1981 ◽  
Vol PER-1 (11) ◽  
pp. 28-29
Author(s):  
Edward J. Simburger ◽  
Francis J. Hubert
Keyword(s):  
Power System ◽  
Low Voltage ◽  
Power System Restoration ◽  
System Restoration ◽  
Bulk Power

scholarly journals Application of Solid-State Transformers in a Novel Architecture of Hybrid AC/DC House Power Systems

Energies ◽  
2020 ◽  
Vol 13 (13) ◽  
pp. 3432 ◽  
Author(s):  
Fabio Bignucolo ◽  
Manuele Bertoluzzo
Keyword(s):  
Solid State ◽  
Power Systems ◽  
Distribution Networks ◽  
Heat Pumps ◽  
Operating Conditions ◽  
Dynamic Simulations ◽  
Load Variations ◽  
Solid State Transformers ◽  
Local Resources ◽  
Induction Cooking

The ongoing diffusion of solid-state DC/DC converters makes possible a partial migration of electric power systems from the present AC paradigm to a future DC scenario. In addition, the power demand in the domestic environment is expected to grow considerably, for example, due to the progressive diffusion of electric vehicles, induction cooking and heat pumps. To face this evolution, the paper introduces a novel electric topology for a hybrid AC/DC smart house, based on the solid-state transformer technology. The electric scheme, voltage levels and converters types are thoroughly discussed to better integrate the spread of electric appliances, which are frequently based on internal DC buses, within the present AC distribution networks. Voltage levels are determined to guarantee high safety zones with negligible electric risk in the most exposed areas of the house. At the same time, the developed control schemes assure high power quality (voltage stability in the case of both load variations and network perturbations), manage power flows and local resources according to ancillary services requirements and increase the domestic network overall efficiency. Dynamic simulations are performed, making use of DIgSILENT PowerFactory software, to demonstrate the feasibility of the proposed distribution scheme for next-generation smart houses under different operating conditions.

scholarly journals Solid State Transformers: Concepts, Classification, and Control

Energies ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2319 ◽  
Author(s):  
Mohammed Azharuddin Shamshuddin ◽  
Felix Rojas ◽  
Roberto Cardenas ◽  
Javier Pereda ◽  
Matias Diaz ◽  
...  
Keyword(s):  
Solid State ◽  
Power Distribution ◽  
Smart Grids ◽  
Energy Demand ◽  
Material Selection ◽  
Distribution Networks ◽  
Renewable Energy Resources ◽  
Power Sources ◽  
Solid State Transformers ◽  
And Control

Increase in global energy demand and constraints from fossil fuels have encouraged a growing share of renewable energy resources in the utility grid. Accordingly, an increased penetration of direct current (DC) power sources and loads (e.g., solar photovoltaics and electric vehicles) as well as the necessity for active power flow control has been witnessed in the power distribution networks. Passive transformers are susceptible to DC offset and possess no controllability when employed in smart grids. Solid state transformers (SSTs) are identified as a potential solution to modernize and harmonize alternating current (AC) and DC electrical networks and as suitable solutions in applications such as traction, electric ships, and aerospace industry. This paper provides a complete overview on SST: concepts, topologies, classification, power converters, material selection, and key aspects for design criteria and control schemes proposed in the literature. It also proposes a simple terminology to identify and homogenize the large number of definitions and structures currently reported in the literature.

A Isolated Bidirectional DC/DC Converter with Low-Voltage IGBTs for Solid-State Transformers

2020 ◽  
Author(s):  
Xiaodong Zhao ◽  
Binbin Li ◽  
Qintian Fu ◽  
Yuejie Zhang ◽  
Shaukai Mao ◽  
...  
Keyword(s):  
Solid State ◽  
Low Voltage ◽  
Solid State Transformers

scholarly journals Self-Healing Besides Restoration Methods in Smart Grid Distribution Networks

2020 ◽  
Vol 9 (6) ◽  
pp. 1123-1128
Keyword(s):  
Smart Grid ◽  
Power System ◽  
Distribution System ◽  
New Technologies ◽  
Distribution Networks ◽  
Grid Technology ◽  
Self Healing ◽  
Smart Grid Communications ◽  
Power Restoration ◽  
Smart Grid Technology

The Smart grid refers to a next-generation power grid which is a two-way information flow where electricity and information switch over between the service and its customer’s. The power system becomes smart by applying intelligence by way of multidirectional flow of electricity and information to create an extensive distribution network through smart grid technology. It made smarter power system by developing a networking communication, controls, automation, new technologies and tools working together to make the great efficient and more secure environment. For an effective integration and quality of the service to the consumer's smart grid technology is needed due to working with the electrical distribution system and quickly to respond digitally for rapidly changing electric demand. At this point, an electricity disruption such as a blackout can affect a series of failures that can affect several areas such as banking, traffic, and security. To address the power restoration, smart grid makes use of self-healing strategy which will allow automatic switching when equipment failure or outages occur. There have been numerous studies in the last decade or so in to even out the fundamental and mathematical challenges of making a smart self-healing grid a reality. In this paper, we explore the Selfhealing approach for Smart grid Communications likewise discusses the service restoration methods in Distribution Networks of Smart Grid Environment

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