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The electrification of heat and transport along with significant increases in distributed energy resources pose challenges for distribution network operators (DNOs) as they evolve into distribution system operators (DSOs). Issues may include capacity constraints, voltage excursions, lower supply security and reduced power quality. A method of addressing these matters whilst unlocking capacity is therefore...
Electric road systems (ERS) are an emerging technology driven by the growing need for electric propulsion of land transports. Electric vehicles, supplied by energy from charging when standing still, have significantly more limited operating range than vehicles supplied by combustible fuels. Electric road systems allow the electric vehicles to charge continuously while driving, making the electric...
The evaporative cooling system for wind power generator inclines at an angle of 3∼5 degrees. Due to the special structure, it forms a liquid-gas two-phase self-circulation. Two-phase flow self-circulating system is a typical nonlinear dynamic system. So it is important to study the nonlinear characteristics. In this paper, the nonlinear characteristics were studied through theoretical analysis and...
Cable conductor temperature is the key condition to determine whether current in operation reaches to cable's ampacity. In order to optimize cable operation, it is important to calculate cable conductor temperature with high accuracy. A simple and quick method of calculating temperature field for double-circuit underground cables is introduced in this paper. The superpose principle is applied to establish...
The interest in using a superconducting (SC) distribution grid on a ship designed with a medium voltage dc (MVDC) system is a natural one, because superconductors (SCs) perform at their best under dc power. The potential advantages could be reduced losses, smaller cable plant size, and an electrically stiffer power bus. However, the use of SCs, does not eliminate losses completely and requires additional...
The U.S. Navy is exploring the use of power electronics based Medium Voltage Direct Current (MVDC) power distribution systems to affordably provide power to advanced mission systems. The design of equipment and the system grounding scheme should be designed to limit common mode (CM) currents through the ship's hull. This paper presents a CM model of an MVDC power distribution system and makes recommendations...
In order to design electrical devices using coil or conductive media, an analysis of precise eddy current distributions is necessary. However, the distribution of eddy current inside a conductive media is somewhat complicated. In this paper, the eddy current distributions by finite element analysis inside a conductive media is analyzed. Based on the eddy current distributions of this paper, several...
In the inner evaporative cooling turbo-generator, the cooling medium flows in the hollow conductor of stator and the cooling system depends on the sensible heat and latent heat of cooling medium to achieve the cooling goal of generator. Due to each cooling medium has unique thermal properties, the flow characteristics of different cooling medium in the hollow conductors is disaffinity. In this paper,...
To develop a new standard design of gas-insulated bus(GIB), an electromagnetic-structural finite element analysis has been conducted considering the electromagnetic force generated in GIB with a large current. The GIB are electrical bus-bar parts of a gas-insulated switchgear(GIS) installed as a protective device in power plants and substations. Since the electromagnetic forces generated by a large...
The core temperature of power cables is a key supervising factor which concerns the operation safety of transmission line. However, direct measurement influences insulation performance due to embedding instruments into the cable. In this paper a measurement method using temperature retrieval is proposed. The finite element models of the cable are established for excavating the implicit relationships...
This paper presents a comparative study of dual-adaptive DFE for 4PAM serial links with a reduced number of error slicers. Two set of SS-LMS DFE, one for optimal DFE tap coefficients and the other for optimal reference for error generation are employed. The data-dependent nonlinear characteristics of channels and their effect on the choice of the reference for error generation are investigated. We...
Penta-graphene (PG) has a large ratio of surface to volume and an intrinsic quasi-direct band gap that may benefit for the application of semiconductor sensors. In order to investigate the adsorption behavior of nitric oxide (NO) molecule on the surface of PG, in this study, the adsorption energy, charge transfer and adsorption distance of NO at different locations of pristine and Al-doped PG are...
Arc burning phenomenon of insulated rail joint at cut-off point is one of important challenges in high-speed railway (HSR) stations. In order to study this issue in specific, by utilizing MATLAB/Simulink software, the equivalent integration model of electric multiple units (EMU) running in the station traction network is established to perform simulation analysis. The actual traction power supply...
Electrical busways are replacing cables due to their ease of installation and the advantage of not having to pull extra lines for extra power needs. Elbows are used in busways to change the direction of straight run and has the disadvantage of requiring two junction blocks to integrate it to the system. A special elbow joint has been designed that removes the usage of two more junction blocks as used...
In this paper, an equivalent circuit approach is proposed to model the electric and thermal responses in DC cable systems intended for electric ships. The proposed model is sufficient to address the complexity of the nonlinear physics, including space charge accumulation within the dielectric, yet flexible enough to enable rigorous population-based design. Indeed, a genetic algorithm has been implemented...
As the device miniaturization, the assembly is becoming more and more dense. The current fine pitch package or micro BGA and other forms of interconnection come to a certain limit, which hindering the development of packaging and assembly. high-density assembly and packaging is facing a lot of new challenges. Today, even the most of the fine pitch packages' pitch maintained at around 0.3mm, it is...
Based on the Silicon-based IPD(Integrated Passive Device) technology, an experiment on IPD microstrips is presented. Some metal materials which are used in semiconductor press are applied in IPD microstrips and the microstrips are optimized for 50Ω impedance matching for better signal transmission. The experiment is carried by HFSS simulated software for transmission status from DC-30GHz and the reason...
We show the first experimental result of direct hot electron imaging by scanning the local ultra-high frequency 21 terahertz, THz) shot noise at room temperature. In nonequilibrium situations, the local fluctuation of current-carrying electrons (known as shot noise) contains fingerprint-like information of electron kinetics. We use a sharp tungsten tip as a movable, contact-free noise probe to locally...
Ironless axial-flux machines present an attractive machine design avoiding core losses. The design challenge with these machines is to find a suitable winding arrangement that does not generate additional losses in return. In a novel approach of using a ceramic plate winding carrier, this paper discusses the design considerations for a four-pole, high speed axial-flux machine winding. The work compares...
This paper studies the characteristics and design concept of low-speed high-torque direct-driven PMSM with fractional-slot concentrated winding used in coal mine belt conveyor system. The fractional slot concentrated winding PMSM with high efficiency, high power density and simple windings type is used widely, and more attention is paid to the influence of cogging torque with different slots and poles,...
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