scholarly journals Compact Medium Voltage DC/DC Converter Using Series-Connected Power Devices

Electronics ◽  
2020 ◽  
Vol 9 (6) ◽  
pp. 1024
Author(s):  
Shaoduo Zheng ◽  
Feng Lyu
Keyword(s):  
Simple Structure ◽  
Low Voltage ◽  
High Reliability ◽  
Low Cost ◽  
Power Devices ◽  
Medium Voltage ◽  
Dc Power ◽  
Driver Circuit ◽  
Converter Design ◽  
Medium Voltage Dc

Medium voltage (MV) DC/DC converters are key equipment for interconnection between DC power lines with different voltage levels in MVDC grids. The Input-series-output-parallel (ISOP) modular MV DC/DC converter is feasible to realize MV to low voltage (LV) conversion. However, a large number of LV modules in the converter may reduce the reliability and increase the complexity. This letter proposes a phase-shifted full-bridge MV DC/DC converter using series-connected power devices as switching modules. The converter is of low cost, simple structure, compact volume, and high reliability because these switching modules require only one external isolated driver circuit and very few components to achieve voltage sharing among series-connected power devices. The operation principle of the switching modules is analyzed, and the simulation and experimental results validate the feasibility of the converter design.

Microgrid Model on Homer Software

2021 ◽  
Vol 9 (VI) ◽  
pp. 757-760
Author(s):  
Mohd Ahamad
Keyword(s):  
Power Generation ◽  
Power Electronics ◽  
Life Cycle Cost ◽  
Low Voltage ◽  
High Reliability ◽  
Low Cost ◽  
Local Area ◽  
New Paradigm ◽  
Power Sources ◽  
Wide Range

A new concept in power generation is a microgrid. The Microgrid concept assumes a cluster of loads and microsources operating as a single controllable system that provides power to its local area. This concept provides a new paradigm for defining the operation of distributed generation. The microsources of special interest for MGs are small (<100-kW) units with power electronic interfaces. These sources are placed at customers sites. They are low cost, low voltage and have a high reliability with few emissions. Power electronics provide the control and flexibility required by the MG concept. A properly designed power electronics and controllers insure that the MG can meet the needs of its customers as well as the utilities. The goal of this project is to build a complete model of Microgrid including the power sources, their power electronics, and a load and mains model in THE HOMER. The HOMER Micropower Optimization Model is a computer model developed by the U.S. National Renewable Energy Laboratory (NREL) to assist in the design of micropower systems and to facilitate the comparison of power generation technologies across a wide range of applications. HOMER models a power system’s physical behavior and its life-cycle cost, which is the total cost of installing and operating the system over its life span. HOMER allows the modeler to compare many different design options based on their technical and economic merits. It also assists in understanding and quantifying the effects of uncertainty or changes in the inputs.

Design of Intelligent Winding Machine for Tassel Thread Based on Stepping Motor

2012 ◽  
Vol 189 ◽  
pp. 317-320
Author(s):  
Hong Shen ◽  
Feng Shao ◽  
Jun Peng Xu
Keyword(s):  
Simple Structure ◽  
Intelligent System ◽  
Rotation Speed ◽  
High Reliability ◽  
Low Cost ◽  
Production Quality ◽  
Stepping Motor ◽  
Precise Control ◽  
Winding Machine ◽  
Thread Problem

On account of the end splitting and dropping thread problem for domestic winding machine during tassel thread production process at present, an intelligent system with subdivision driving module TB6560AHQ and SANYO stepping motor was designed, which adopted the ATMEL89S52 MCU as the core controller. The system achieved precise control of some parameters during the course of tassel thread winding such as torque, direction of rotation, speed, cycle laps, twist, etc. It also reduced the worker’s labour intensity and improved the production quality and efficiency of the tassel manufacturing, moreover, this winding machine has the advantages of simple structure, high torque, high reliability and low cost. It can meet the various control requirements for different tassel thread winding and have a considerable market prospect.

Research on D-PMSG Wind Power System with SDBR for LVRT

2013 ◽  
Vol 448-453 ◽  
pp. 1767-1772
Author(s):  
Xiong Feng He ◽  
Xian Yun Li ◽  
Tong Zhou Ji ◽  
Hao Peng ◽  
Kun Liu
Keyword(s):  
Power System ◽  
Wind Power ◽  
Low Voltage ◽  
Simulation Analysis ◽  
High Reliability ◽  
Low Cost ◽  
Synchronous Generator ◽  
Protection Scheme ◽  
Wind Power System ◽  
Grid Side

For enhancing low voltage ride though (LVRT) capability, this paper proposes a new protection scheme of series dynamic breaking resistor (SDBR) connected to the grid-side inverter (GSI) of directly driven permanent magnet synchronous generator (D-PMSG) wind power system, which has a lot of advantages such as possessing low cost, simple structure and high reliability. The structure, switching control strategy and matched resistance of SDBR are researched. The proposed scheme was then applied to uplift GSI voltage during a fault, maintain active power delivered to grid, inhibit DC-link overvoltage and GSI overcurrent. The simulation analysis shows that the SDBR can substantially improve the LVRT capacity of D-PMSG wind power system in PSCAD/EMTDC.

scholarly journals DESIGN AND CONSTRUCTION OF A LOW-COST 30KV VARIABLE DC POWER SUPPLY UNIT

2020 ◽  
pp. 3666-3673
Author(s):  
Bolarinwa H.S. ◽  
Fajingbesi F.E. ◽  
Yusuf A. ◽  
Animasahun L. O. ◽  
Babatunde Y. O.
Keyword(s):  
High Voltage ◽  
Power Supply ◽  
Low Voltage ◽  
High Reliability ◽  
Low Cost ◽  
Scientific Data ◽  
High Voltage Power Supply ◽  
Technology Application ◽  
High Voltage Direct Current ◽  
Current Voltage

A high voltage power supply is a key component in the advancement of science and technology. Application of high voltage power supply requires careful attention to critical variables such as voltage ripple, long and shortterm stability, repeatability and accuracy. These are important factors in the consideration of reliable scientific data. This paper presents the design of a low-cost high voltage power supply from the off-the-shelf electronics components to meet the high-end requirement of high voltage power supply. A 30kV, 63.8mA maximum power supply was constructed at the Fountain University electronics workshop. This high voltage directs current (HVDC) power supply was built around three basic compartments that include an adjustable low voltage power supply (LVPS), a high frequency oscillator, and a line output transformer (LOPT) using flyback transformer, NE555timer, BU508D BJT, and other off-the-shelf components. The current-voltage relationship at the output of the constructed High Voltage Direct Current was found to be linear. This power source will serve any high DC voltage applications such as electrospinning. The constructed 30kV power supply has been tested in the electrospinning laboratory of the Center for Energy Research and Development (CERD) Obafemi Awolowo University (OAU) Ile-Ife. The unit successfully electrospun Zinc-Titaninm polymeric solution into fibers at about 8 kV. The importance of this fabricated device is its high reliability despite its low cost and capability to produce different magnitude of high voltage DC.

scholarly journals Partial Discharge and Internet of Things: A Switchgear Cell Maintenance Application Using Microclimate Sensors

Sensors ◽  
2021 ◽  
Vol 21 (24) ◽  
pp. 8372
Author(s):  
Radu Fechet ◽  
Adrian I. Petrariu ◽  
Adrian Graur
Keyword(s):  
Internet Of Things ◽  
Low Voltage ◽  
Low Cost ◽  
Time Interval ◽  
Efficient System ◽  
Climate Conditions ◽  
Medium Voltage ◽  
Iot Platform ◽  
Significant Damage ◽  
Microclimate Monitoring

This paper proposes a solution for the development of microclimate monitoring for Low Voltage/High Voltage switchgear using the PRTG Internet of Things (IoT) platform. This IoT-based real time monitoring system can enable predictive maintenance to reduce the risk of electrical station malfunctions due to unfavorable environmental conditions. The combination of humidity and dust can lead to unplanned electrical discharges along the isolators inside a low or medium voltage electric table. If no predictive measures are taken, the situation may deteriorate and lead to significant damage inside and outside the switchgear cell. Thus, the mentioned situation can lead to unprogrammed maintenance interventions that can conduct to the change of the entire affected switchgear cell. Using a low-cost and efficient system, the climate conditions inside and outside the switchgear are monitored and transmitted remotely to a monitoring center. From the results obtained using a 365-day time interval, we can conclude that the proposed system is integrated successfully in the switchgear maintaining process, having as result the reduction of maintenance costs.

scholarly journals Integrated Solution for Driving Series-Connected IGBTs and Its Natural Intrinsic Balancing

Energies ◽  
2019 ◽  
Vol 12 (12) ◽  
pp. 2406
Author(s):  
Gustavo O. Fortes ◽  
Marcos A. S. Mendes ◽  
Porfírio C. Cortizo
Keyword(s):  
Low Voltage ◽  
Low Cost ◽  
Operating Conditions ◽  
Experimental Results ◽  
Commercial Products ◽  
Lower Power ◽  
Medium Voltage ◽  
A Current

The use of series connected IGBTs is still a current subject in literature, despite such a discussion having started in the 1990s. Though countless academic studies, there are currently no available commercial products on the market for medium voltage inverters (up to 4.16 kV) and lower power (up to 1 MW) using this technology. This is related to the difficulty of ensuring the dynamic and static voltage sharing between IGBTs, giving rise to relatively expensive and complex firing circuits, when compared to the components they intend to control. Therefore, this article aims to present a simple and low-cost alternative, still effective for driving low voltage series-connected IGBTs, specifically for the encapsulation TO-247 type. Experimental results are presented showing the behavior of the solution under several operating conditions.

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