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Paper presents performance of the 40kVA autonomous, adjustable speed generation system in a short-circuit condition, protected by a B-class tripping switch. Tripping switch is unable to clear the short-circuit event when an inverter current is limited, thus a topology of asynchronous bypass is developed, which delivers additional current directly from permanent magnet generator. Experiments of the...
This paper analyzes power generation from sea waves by using power conditioning system and linear permanent magnet generator. A buoy is placed on the ocean surface and connected to the linear generator. The wave energy is carried out from the movement of a buoy. An electrical conversion system is needed between the generator and the grid. For an analysis of the power system, the modeling of the linear...
Reliability and safety issues of the electrical power generation systems becomes more and more popular research topic - especially analysis of the electrical power supply systems operation under fault conditions like e.g. overload or short circuit. Appropriate topology of the rectifier is required to provide stable output voltage and control of the supplied AC current. One of the rectifier topologies...
A double buoy power generation system using the field-modulating tubular linear permanent magnet generator (FMTLPMG) is proposed for wave energy conversion in this paper. Ocean wave theory is adopted to analyze the double buoys hydrodynamic problems and calculate the relative velocity. The traditional linear generator has disadvantages of big weight and low power density caused by the slow ocean wave...
This paper presents the design and analysis of a linear oscillatory single-phase permanent magnet generator (LOG) for free-piston stirling engine systems (FPSEs). In order to implement the design of LOG for suitable FPSEs, we performed a characteristic analysis of various types of LOGs having different design parameters. To improve the efficiency, we performed a characteristic analysis of the eddy-current...
This paper presents the operation and characteristics of a doubly salient PM generator for tidal energy turbine. The behavior and the supply strategy of this unconventional machine is described. An energy ratio criterion is introduced and combined with a torque to mass ratio one for the design of such system taking into account both the generator compactness and the converter sizing. A simple method...
This paper presents a decentralized current control approach for a nine-phase wind turbine generator. This type of generator has three different three-phase stators sharing the same machine yoke and connected to the grid by means of three different voltage source back-to-back power converters. Due to the machine configuration, magnetic couplings are present between the three stators, complicating...
This paper presents the optimization of linear permanent magnet generator for wave energy conversion. The finite element analysis has been carried out in order to determine the electromagnetic characteristics such as; air-gap flux density and induced-EMF. The copper loss and iron loss are evaluated individually and the effects of main leading dimension which have significant influence on the efficiency...
Transverse flux permanent magnet generator (TFPMG) with double-C stator-hoop and flux-concentrated rotor attracts people's attention due to its high power density and simple fabricated procedure. The structure and electromagnetic characteristics of the proposed generator with different pole-pair numbers are described and analyzed in detail by three-dimensional (3-D) finite element method (FEM). The...
Linear permanent magnet generators are widely considered for the direct conversion of energy contained in sea waves [1-3]. Both planar and tubular structures have been proposed [4-6] and all these structures present several advantages: relative high efficiency, simplicity of the structures, high sturdiness. However, as all other linear machines they present some drawbacks: oscillations in the movement,...
This paper focuses on the currents supply waveforms of a non-conventional electrical machine - Doubly Salient Permanent Magnet Generator (DSPMG) (10 kW, 50 tr/min), which is dedicated to marine tidal current applications. A dynamical dq model is firstly developed. Then, classical sinusoidal and quasi sinusoidal current waveforms are all applied for DSPMG to minimize the torque ripples and to analyze...
A new electric machine topology is presented — the Harmonic Fields (HF) Generator — which is perfectly suited for wind applications. A wind turbine drive built around an HF generator has a higher energy yield than a turbine with conventional generator and frequency converter, is cheaper to build and requires less maintenance.
Several linear synchronous generators for the exploitation of sea wave energy have been proposed. Such machines do not require reactive power for the magnetization since they use permanent magnets for the excitation. The use of permanent magnets in a rough environment such as the marine environment may be a very weak point in the application of these kind of devices. In order to overcome this difficulty,...
This paper focuses its attention on the wave energy converters (WEC), particularly the ones that use a moving body (wave activated bodies) coupled directly to a power take-off (PTO). It describes the analysis and the design of a small reciprocating linear permanent magnet generator. A comprehensive design methodology, which embraces both the electromagnetic and mechanical design, is described. Nonlinear...
The design of a prototype linear permanent magnet machine for a linear reciprocating generator is outlined in this paper, at the end, also the characterisation results are described. It has been built to investigate the energy conversion using long/short stroke linear reciprocating generators. The electromagnetic design is based around analytical field solutions which allow the optimisation of the...
The free-piston linear generator (FPLG) is a high efficient energy converter. It is capable of converting chemical energy into electrical energy by using a combustion process. The FPLG can be used as an alternative energy converter for hybrid cars. The focus of this publication is to show the interesting advantages of the FPLG if used as decentral heat and power station. The first part of this publication...
The paper describes the design and the experimental characterization of a small reciprocating linear permanent magnet generator. It has been built to investigate operation at speed of 0.5 m/s, for 1.2 meter wave energy converter. A comprehensive design methodology, which embraces both the electromagnetic and mechanical design, is described Nonlinear electromagnetic and structural finite-element analysis...
This publication deals with the calculation and the measurement of the iron losses in a linear generator. The linear generator is intended for use in a hybrid power train design for a vehicle. The system surrounding the linear generator and some parameters have an influence on the linear generator and its iron losses. They will be explained to achieve a fundamental understanding of the requirements...
The use of permanent magnets offers freedom in machine design and the highest possible efficiencies for wind power machines. Although full power converters must be used with permanent magnet machines, these converters make it possible to fulfill even the strictest grid codes. If appropriate care is taken in selecting the exact magnetic material composition, Neodymium-Iron-Boron magnets are compatible...
A new converter topology for a permanent magnet synchronous generator based variable speed wind turbine is presented in this paper. Main focus is on a combined topology of a controlled rectifier and a brand new step-up isolated DC/DC converter. This topology (controlled rectifier coupled with a quasi-Z-source based galvanically isolated step-up DC/DC converter) is essential to generate a regulated...
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