The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Indirect matrix converter (IMC) is studied for aircraft starter/generator(S/G) application in this paper. Careful consideration of two S/G system structures is presented. In the two structures, S/G is located at the voltage source side and the current source side of IMC respectively. The former is mentioned in existing literature and the latter is proposed by this paper. It is shown that the former...
In order to overcome the excitation problem of three-stage synchronous machine(TSM) used as starter for the engine cranking, this paper presented a novel three-phase open-winding structure of the exciter for the proposed machine with the dual-inverter for supplying the integrated AC and DC excitation power. The operation principle of the dual-inverter and the control method of the three-phase AC excitation...
This paper presents a novel integrated starter-generator system consisted of engine, open-winding permanent magnetic synchronous machine, storage battery, voltage source converter (VSC) and rectifier for overcoming the difficulties of voltage regulation and narrow speed range of conventional integrated starter-generator system based on permanent magnetic machine. In the proposed system, one side of...
This paper investigates a novel variable-speed generation system. A new integrated power circuit with voltage clamp protection and self-excitation function is presented. Conventionally, due to the large internal impedance of a generator, oscillations are produced by the resonances of the filter in armature currents which may cause unstable behavior of the generation system. In this paper, an active...
For a variable-speed wind power generation system equipped with the fixed-pitch wind turbine and doubly salient electro-magnetic generator (DSEG), the rotational speed can't be changed by pitch control. In this paper, a novel speed control method based on excitation current control of DSEG wind power generator (DEWG) in full range of wind speed is studied, based on their characteristics. It is composed...
A novel wind turbine emulator (WTE) based on a torque controlled Brushless DC (BLDC) motor is presented, which can emulate the steady-state and dynamic characteristics of an actual wind turbine. Variable wind speeds, turbine inertia and torque oscillation caused by tower shadow and wind shear are all considered in the construction of the actual wind turbine model and the torque controlled BLDC model...
Wind generator has a typical characteristic of more pole-pairs number on the occasion of low speed and high power, and DSEG should adopt multi-pole-rotor structure for the corresponding relation of pole-pairs number and rotor pole number. The increase of rotor-pole number leads to the obvious increase of core loss. Flux waveform of different part of 24-32-DSEG is analyzed in this paper, and core loss...
The paper presents a fault diagnosis algorithm for rectification circuit in doubly salient electro-magnetic wind generator system. The laws of excitation current both in normal condition and fault conditions were analyzed in detail. And it classified the faults (within 2 diodes faults) as 7 patterns or 22 faults states according to distortion laws of excitation current. Taking 24/16 poles doubly salient...
Efficient algorithms for mining frequent itemsets are crucial for mining association rules. As a condensed and complete representation of all the frequent itemsets, closed frequent itemsets mining has arisen a lot of interests in the data mining community. However, most of the studies havenpsilat addressed the effects of noise in the data sets on the algorithms, and there has been limited attention...
This paper presents the operational principles, design and transient analysis of a new three-phase 12/14-pole doubly salient electrical magnet (DSEM) generator for its application in direct-driven wind power generation. Design equations, finite element and dynamic analysis of the new generator are described. The 12/14-pole DSEM generator with constant self-inductance has lower voltage ripple compared...
Nowadays, characteristics analysis of doubly salient electro-magnet machine is mostly about starter or generator separately, while transient characteristics of switching from starter to generator are less studied. Process of switching from starter to generator is an important part of the whole starter/generator system. In this paper, integral MATLAB model of doubly salient electro-magnet starter/generator...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.