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Flux-switching permanent magnet machines (FSPM) show high-reliability and are quite suitable for the fields such as new energy, electric vehicle and aerospace. In this paper, the id=0 vector control strategy based on SVPWM was proposed. Besides, the high frequency signal injection method was used to identify the initial rotor position of FSPM. The experimental results proved the feasibility of the...
In order to increase the efficiency of enterprise and reduce the grid load demand of large-scale renewable energy such as wind and solar energy in regional power grid system, Shapley value method has been proposed to analyze the cooperation game relationship between high energy-consuming customer and power system. Using the system dynamics method, an interaction analysis model for describing participation...
To satisfy the high reliability demand of driving motor used in electrical vehicles, a novel parallel dual-redundancy flux-switching permanent magnet machine was proposed in this paper, which is composed of two identical machines. The installation angle of the two rotors to eliminate specific order and all odd order harmonic components of cogging torque was derived. Further, the torque sharing control...
A novel high-reliability DC generator system integrating flux-switching machine with segmental rotor, of which both armature and excited windings are located in the stator, rectifier and excitation controller was proposed in this paper. At first, the working principle of SFSM and the DC generator was introduced in detail. Further, a prototype was designed based on finite element analysis of flux-switching...
As heat flux densities grow higher, the evaporative cooling system seems to be the most effective way of removing heat from high current rectifier equipment. In order to validate the evaporative cooling system can substitute the water cooling in engineering application and get the actual operational effect, also to provide the DC power supply demands for 200MW turbo-generator model, the high current...
Cooling is very important for the safe operation of an electron cyclotron resonance ion source (ECRIS), especially when the window current density is very high (up to 11 A/mm2). We proposed an innovative cooling method using evaporative cooling technology. A demonstration prototype was designed, built and tested. The on-site test results showed that the temperature of the solenoids and permanent magnets...
Quench detection and protection of superconducting coil is an important subject of superconducting power technology practical application, in order to detecting the superconductor quenches signal quickly and accurately, on the basis of the existing super voltage loss test, this paper put forward a kind of microvolt dc voltage signal detection amplifier for superconducting motor rotor, through using...
The energy-saving Copper-clad Aluminum busbar is an new-type power transmission line, which has been used in many industry fields, such as power grid, petrochemical industry, metallurgic industry. It has the characteristic of energy-saving, material-saving, safety-operating. The new type busbar is composed of copper pipe and aluminum pipe. This paper is aim to study the best proportion of the thickness...
Aiming at overcoming the shortage of high cogging torque in flux-switching permanent magnet machine (FSPM), a novel coaxial double flux-switching permanent magnet machine was proposed. The electromagnetic characteristics of the machine, including flux linkage, back EMF, cogging torque, static torque, are studied by means of finite element method in this paper. The study results of this paper show...
Switched reluctance machine (SRM) and flux-switching machine (FSM) with segmental rotors are different in winding patterns and control strategies. The electromagnetic characteristics of the two machines, including magnetic field, static torque, torque ripple, iron loss and efficiency, are compared by means of analytical calculation and finite element method in this paper. The analytical results of...
Combine the fractional slot concentrated winding (CW) with inner evaporative cooling system (IECS), we can provide a new train of thought of cooling for the permanent magnet (PM) wind turbines. Wind generator with FSCW and IECS has some special characteristics compared with traditional wind generator with distributed wind (DW) and air cooling system. These must be considered during the design work...
In order to analyze the small signal stability of the grid interconnection of different types of wind turbines, in the PSAT simulation environment, this paper establishes simulation model with IEEE3 machine 9-bus system as a prototype, and the small signal stability of power system connected with 3 kinds of wind farms is respectively simulated and compared. The results show that, due to the isolation...
This paper proposed a novel dual closed loop control of speed and torque method in brushless DC motor (BLDCM) drivers based on genetic algorithm. By defining speed error and torque error as optimum objective functions, using genetic algorithm, the PID parameters can be optimized. In addition, the torque ripple during commutation has been analyzed, and a variable switch conduction mode has been introduced...
Evaporative cooling system has the advantage of high cooling performance, good insulation properties, less electrical fault, easy to maintain and high reliability, can meet the requirements of the cooling system in wind power generators. Based on a large number of theoretical researches and engineering practices, we had a comprehensive study of evaporative cooling wind power generator. Studies show...
In December 2011 and July 2012, two sets of 840MVA Hydro-generator of Three Gorges on Yangtze River with Close-Loop-Self-Circulating Evaporative Cooling (CLSCEC) System were put into commercial operation. In this paper, we make engineering summary of these two generators with CLSCEC System. We also make a comparison between the internal water cooling (IWC) hydro-generator used in Three Gorges power...
This paper discusses 3-D temperature estimation for the electric generator in rim-driven marine current power (RMCP) system. The structures of RMCP system, especially the structure of permanent magnet generator are presented in this paper. Based on the hydromechanics and heat transfer theories, the 3-D thermodynamics simulation model is modeled and its related parameters are discussed. Computational...
On the basis of character of high-power density and low-volume motor, this paper presents a new design proposal, using the evaporation-cooling technology. In this paper, the detailed design of the cooling structure of the motor is described. Meanwhile, the constructions of the electromagnetic structural model of the motor and computerized simulation are introduced, and the key points of the rotor...
Spray cooling is a very efficient mean for dissipating high heat flux with low volumetric flux and Low surface temperature, which is used in many fields. However, there are many differences about the heat transfer mechanism of spray cooling academically. This paper introduces in detail an experimental device, which can be used for heat transfer research of single-phase and two-phase spray cooling...
The brushless DC motor, which emerged as the development of technology of electronics, is a new kind of DC motor, and it is also the important part of modern industry [1]. Because of its reliability of operation, brushless DC motor has been widely used in many special areas, such as aerospace and mining.
Turbo generator with evaporative cooling stator and water cooling rotor possesses many excellent qualities for mid unit. The rotor bars are cooled by water inner cooling mode. The stator bars and core are immerged in evaporative coolant, which could be cooled fully. This paper presents the study of heat-transfer with different features in the turbo generator, and analyzing it by CFD. Finally, the...
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