Flux Leakage Reduction in Linear Vernier Generators Using High-Temperature Superconducting Elements

Vestnik MEI ◽  
2021 ◽  
pp. 82-90
Author(s):  
Andrey A. Drozdov ◽  
◽  
Pavel A. Kurbatov ◽  
Ekaterina P. Kurbatova ◽  
◽  
...  
Keyword(s):  
High Temperature ◽  
Power Plants ◽  
Cooling System ◽  
Magnetic Moments ◽  
Interaction Force ◽  
Wave Power ◽  
Power Performance ◽  
High Temperature Superconducting ◽  
Motion Speed ◽  
Generator Design

The article presents the results of studies aimed at improving the power performance indicators of linear electric generators for wave power plants by reducing the flux leakages using high-temperature superconducting (HTS) inserts placed in between the teeth. The generator design involving application of the Vernier principle for magnetic flux modulation with a translator in the form of a hollow cylinder is considered. Generators of this type are used in float wave power plants driven directly by a reciprocating float, which transmits large forces at a low motion speed. The calculations were carried out using the HTS properties modeling procedure based on representing the currents induced in a superconductor in the form of magnetic moments of these currents, which made it possible to simplify the analysis of the electromagnetic field in the generator without significant additional errors. As a result, the characteristics of the electromagnetic force longitudinal components and phase winding flux linkages versus the translator displacement have been obtained. The use of HTS inserts and a distributed winding in the stator made it possible to reduce the electromagnetic leakage losses and increase the interaction force between the stator and translator. However, since the additional outlays for the cooling system and thermal insulation of the HTS elements are commensurable with the generator cost, the obtained results on improving the power performance parameters do not allow an unambiguous statement to be made about the effectiveness of the considered technical solutions.

scholarly journals Thermo-Hydraulic Analysis of a Tri-Axial High-Temperature Superconducting Power Cable with Respect to Installation Site Geography

Energies ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3898
Author(s):  
Youngjun Choi ◽  
Dongmin Kim ◽  
Changhyung Lee ◽  
Duyeon Won ◽  
Jaeun Yoo ◽  
...  
Keyword(s):  
High Temperature ◽  
Urban Areas ◽  
Cooling System ◽  
Power Cable ◽  
Cfd Analysis ◽  
Power Cables ◽  
Hydraulic Analysis ◽  
Long Distance ◽  
High Temperature Superconducting ◽  
Return Path

Various high-temperature superconducting (HTS) power cables are being developed or are ready for commercial operation to help energy suppliers meet the growing power demand in urban areas. Recently, triaxial HTS power cables have been developed by Korea Electric Power Corporation (KEPCO) and LS Cable & System. Further, KEPCO has been planning to install a 2 km long 23 kV/60 MVA triaxial HTS power cable to connect the Munsan and Seonyu substations and increase the stability of the power grid. The HTS power cables should be cooled down to a cryogenic temperature near 77 K. A thermo-hydraulic analysis of the cooling system considering the geographical characteristics of the installation site is essential for long-distance sections. This paper describes the thermo-hydraulic analysis of the triaxial HTS power cable to determine the proper mass flow rates of subcooled liquid nitrogen that meet the operating temperature and pressure of the cable for four configurations of cooling systems: (1) a single cooling system with an external return path, (2) a dual cooling system with an external return path, (3) a single cooling system with an internal return path, and (4) a dual cooling system with internal return path. Since the flow characteristics in a corrugated cable cryostat differ significantly from those in a typical annular tube, a computational fluid dynamics (CFD) analysis was conducted to estimate the pressure drop along the cable cryostat. With the CFD analysis and given heat loads in the cable, the temperature and the pressure variations along the cable were calculated and their pros and cons were compared for each configuration of the cooling system. This thermo-hydraulic analysis will be referenced in the actual installation of the HTS power cable between the Munsan and Seonyu substations.

Study of neon heat flux in thermosyphon cooling system for high-temperature superconducting machinery

2019 ◽  
Vol 142 ◽  
pp. 258-265 ◽  
Author(s):  
K. Yamaguchi ◽  
M. Miki ◽  
E. Shaanika ◽  
M. Izumi ◽  
Y. Murase ◽  
...  
Keyword(s):  
Heat Flux ◽  
High Temperature ◽  
Cooling System ◽  
High Temperature Superconducting

Analysis and Design of Cooling System in High Temperature Superconducting Synchronous Machines

2007 ◽  
Vol 17 (2) ◽  
pp. 1557-1560 ◽  
Author(s):  
Biao Chen ◽  
Guo-Biao Gu ◽  
Guo-Qiang Zhang ◽  
Fu-Chuan Song ◽  
Cai-Hong Zhao
Keyword(s):  
High Temperature ◽  
Cooling System ◽  
Synchronous Machines ◽  
Analysis And Design ◽  
High Temperature Superconducting

Thermal Design of a Cryogenics Cooling System for a 10 MW-Class High-Temperature Superconducting Rotating Machine

2015 ◽  
Vol 25 (3) ◽  
pp. 1-5 ◽  
Author(s):  
Thanh Dung Le ◽  
Ji Hyung Kim ◽  
Sa Il Park ◽  
Dong-Hyung Kang ◽  
Haigun Lee ◽  
...  
Keyword(s):  
High Temperature ◽  
Cooling System ◽  
Thermal Design ◽  
High Temperature Superconducting ◽  
Rotating Machine

A Natural Circulation Waste Heat Recovery System for High Temperature Gas-Cooled Reactor Used and/or Spent Fuel Tanks: Part II — Theoretical and Experimental Validation

2013 ◽  
Author(s):  
Franck M. Senda ◽  
Robert T. Dobson
Keyword(s):  
High Temperature ◽  
Energy Conservation ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Power Plants ◽  
Waste Heat ◽  
Cooling System ◽  
Natural Circulation ◽  
Spent Fuel ◽  
Fuel Tanks

Since the beginning of the twenty-first century, energy conservation has become a major feature of interest in most industrialised countries. The economics of saving energy versus wasting it has driven industrial activists to pay more attention to energy conservation. The implementation of energy conservation requires that all the possibilities of counteracting any potential loss of energy must be considered. This includes reducing heat losses from furnaces, thermal insulation, repair of steam leaks in power plants, heat loss from nuclear reactors, and all other practices that may be implemented rapidly and, preferably at low cost. Once this is achieved, further strategies have to be developed to stabilise short-term energy conservation in systems by implementing permanent solutions. Permanent energy conservation solutions are more expensive, but result in energy benefits over many years. These permanent solutions are referred to as Waste heat recovery systems (WHRSs). This paper presents potential application of WHRSs in high-temperature reactors technology. WHRSs have attracted the attention of many researchers over the past two decades, as using waste heat improves the system overall efficiency, notwithstanding the cost of extra plant. WHRSs require specially designed heat recovery equipment, and as such the used and/or spent HTR fuel tanks were considered by the way of example. An appropriately scaled system was designed, constructed and tested to demonstrate the functioning of such a cooling system first and validated the theoretical model that simulates the heat transfer process in the as-designed WHRS. It is a one-dimensional flow model assuming quasi-static and incompressible liquid and vapour flow its mathematical simulations as developed in Part I (Senda and Dobson, 2013). Two separate and independent cooling lines, using natural circulation flow in a particular form of heat pipes called thermosyphon loops were used to ensure that the fuel tank (FT) is cooled when the power conversion unit has to be switched off for maintenance, or if it fails.

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