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This paper describes the experimental study of a synchronous magnetoelectric generator which magnetic system is based on the asynchronous motor: the stator of magnetoelectric generator is made up of induction machine with a number of poles pairs 2p=12, a cylindrical inductor (rotor) is composed of permanent magnets distributed on the rotor surface. The modeling of magnetic system was carried out using...
This paper presents a new configuration of an off-grid single-phase generator using a three-phase induction machine. The use of this kind of machine, cheap and robust, is in line with the “jugaad” philosophy, better known as frugal innovation. In such an application, three-phase induction machines are usually operated as stand-alone single-phase generator which are either self-excited using terminal...
This paper presents test results of the control of a pole-modulated permanent magnet synchronous generator (PM-PMSG) using a dedicated power conversion system to deliver power from an oscillating, low speed wave energy converter (WEC). Due to the low speed of the WEC, the size of the generator is increased and the machine is designed with large number of poles and concentrated winding. The electromotive...
This paper presents the design, construction, and testing of a double-sided, dual airgap linear Vernier generator for wave energy conversion. Both the electromagnetic as well as mechanical design concepts are explored with a particular emphasis on the mechanical aspect given the fact that maintaining a dual airgap for this topology is challenging and has not been previously implemented.
In an Organic Rankine Cycle (ORC) systems, the Permanent Magnet (PM) generator is directly coupled to high-speed turbine shaft, in order to increase system efficiency avoiding introduction of gear-box. On the other hand, current time harmonics induce high frequency currents in rotor parts, which cause a temperature increase. PMs are strongly affected by the operating temperature, since both remanence...
This paper presents results of the control of a magnetic gear integrated permanent magnet synchronous generator (MG-PMSG) using a dedicated power conversion system to deliver power from an oscillating, low speed wave energy converter (WEC). The generator has two rotors and one stator. By magnetic gearing, the low speed of the outer rotor is amplified to the high speed of the inner rotor, which faces...
The optimization of electrical machines can be managed using advanced computational intelligence algorithms. These algorithms can speed up the design phase and can improve the performances, being able to find out the optimal design also in problems involving a large number of physical and geometric parameters. In this paper, a new population based metaheuristic algorithms, named Social Network Optimization...
This papers deals with the control of active and reactive powers in wind energy conversion systems (WECS) powered by dual-stator-winding squirrel-cage induction generators (BDFIG). In these systems, the MPPT technics based on a torque control present coupling with reactive power objectives. A High Order Sliding Mode MIMO control is proposed for satisfying the power objectives in a decoupled way. The...
This paper investigates spatial and time harmonics of flux density and radial force distributions in the airgap of a hydrogenerator with fractional-slot windings. Hydrogenerator is connected to a neutral-point-clamped (NPC) converter, representing a converter-fed synchronous machine (CFSM) in pumped-storage hydropower plant. Magnetic field in the hydrogenerator is computed using time-stepping finite...
Modular design of wind turbine generators is a promising means to increase the generator availability by reducing downtimes, especially for offshore turbines. With such physically modular designs, the structural support for the generator is an important consideration as it needs to overcome the loss of rigidity in the generator yoke. This makes the structural support design of the generator an important...
This paper presents the design and the measurement of two identical PM-generators driven by an axial counter-rotating micro-turbine, called DuoTurbo-microturbine. This prototype for drinking water networks has been jointly developed by the HES-SO Valais//Wallis, the EPFL-Laboratory for Hydraulic Machines and industrial partners. The modular in-line “plug & play” technology requires low investment,...
This paper analyzes the unbalance problem of a standalone cascaded doubly-fed induction generator feeding unbalanced three-phase load. Under this working condition, the output voltages become un-balanced and give rise to a negative sequence component. The classic vector control strategy does not provide the desired performance. A compensation method is proposed to balance the stator voltages. The...
The precise analysis of radio noise or electromagnetic interference produced by defects in high voltage 50 Hz and 60 Hz generator systems has been used as a tool for improved condition based maintenance planning since 1980. Over 65 conditions, both electrical and mechanical can be identified with this test. Several types of data analysis are used to isolate and identify specific conditions. The technique...
Offshore platforms have critical and isolated electrical power supply system including large direct-online motors connected to the generation bus. This paper discusses complications involved in applying protection systems including generator and generator-transformer differentials in coordination with motor starting and motor protection for such applications. Recommendations are provided for applying...
South coast of Java has been highly preferred as the placement location of wave energy converter, due to its relatively huge energy potential. Furthermore, linear permanent magnet generator (LPMG) has became one of the popular methods to convert wave energy to electrical energy. Based on the shape of stator core, there are several models of LPMG. Quasi-flat LPMG is one of them, which has rectangular...
The integrated starter generator (ISG) is one of the key components of hybrid electric vehicles. However, with the significant difference in power range between the two operation modes of the starter and generator, it is difficult for the generator to exhibit excellent behaviors in both modes. To solve this problem, a dual air-gap permanent magnet ISG is investigated in this paper. Torque characteristics...
Rotor winding interturn short circuit is the main fault of synchronous electric machines, it is of great significance to the safe and stable operation of the machine to discover and handle the fault timely. In view of this, the fault positioning method of rotor turn-to-turn short circuit of synchronous machines was studied. The mathematic expression of exciting magnetomotive force (e-m.m.f.), electromotiveforce...
After years of rapid development, wind energy has become one of the three major energy sources in China. Due to the rapid development of wind power industry, wind energy has become one of the most important energy sources in the world, the demand for wind turbines is also growing. Therefore, investigations of the wind turbines are particularly important. Dual-stator brushless doubly-fed generator...
A Linear Rotary Permanent Magnet Generator(LRPMG) is proposed for wind-wave combined power generation system(WWCPGS). The rotary unit and linear unit of the LRPMG can be used to generate electricity by wind energy and wave energy, respectively. Compared with rotary generator by single wind power and linear generator by single wave power, the LRPMG can improve the utilization rate of the material and...
Aircraft Generator is the core part in aircraft power supply system, and its internal fault can lead to the stator winding asymmetry. Even worse, the asymmetry output power created by the asymmetry winding can damage the aircraft electrical equipment, so it is significant to study the internal electrical fault of aircraft generator. And the study can provide reference for maintenance decision. In...
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