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Different current source converter topologies for permanent magnet synchronous generator (PMSG) wind turbine applications are presented and analyzed in the paper. In high-power and medium-voltage range, current source converter has its natural advantages, such as simple topology, compact size, high power capability, excellent short circuit protection, and flexible power flow control. However, it also...
This paper deals with an adaptive control method to be used in the dc-link voltage controller of diesel-electric power supply units being arranged with both permanent magnet generator and three-phase boost-rectifier. The proposed control method is based on a suitable manipulation of the overall system transfer function to achieve an adaptive “closed form” expression for the parameters of the dc-link...
Emerging technologies for marine current turbine are mainly relevant to works that have been carried out on wind turbines and ship propellers. It is then obvious that many electric generator topologies could be used for marine current turbines. As in the wind turbine context, doubly-fed induction generators and permanent magnet generators seems to be attractive solutions to be used to harness the...
This paper presents a novel single-phase reluctance generator with low-cost ferrite magnets between adjacent stator teeth. The stator has both 4-pole field and 8-pole armature windings. The armature windings are connected to the input terminals of a single-phase full-bridge rectifier circuit as AC power source. The DC output terminals are connected to the field windings to increase the excited flux...
The paper deals with the design and testing of a surface-mounting permanent magnet (PM) generator with an outer rotor for variable speed applications. The purpose of this work has been to build a PM generator with simple structure, good performances and relatively low costs. The paper presents the main design specifications and the performance characteristics of a 3 kW, 250 rpm and some test results...
In the perspective of the fossil fuels deposits depletion new energy resources must be developed; amongst them the renewable energy sector seems to be able to provide a long term solution. Besides the already popular wind, solar or thermal energies, the ocean energy sector offers a virtually infinite energy potential; many solutions for harvesting and converting this energy into usable form are under...
Due to their high efficiency and reliability, permanent magnet synchronous machines are widely used in low speed direct-driven applications. The present paper deals with the design and analysis of a special topology of a PMSG suited for small rating, direct-driven wind turbine. A preliminary design procedure is presented and the results are introduced in FEM based software in order to analyze the...
This publication deals with the design calculation of a linear generator 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. They will be explained to achieve a fundamental understanding of the requirements and the resulting topology selection. Then, the analytical and numerical calculations...
This paper deals with the design solution adopted for a high-speed axial-flux permanent-magnet (AFPM) generator devoted to supplementing power in automotive 42V electrical systems. The AFPM generator is suitably designed to be directly coupled with a radial turbo-expander which provides recovery of kinetic energy available from the exhaust gases of an internal-combustion engine. The paper describes...
This paper deals with the field-circuit method developed for quick computation of load characteristics of stand-alone permanent magnet synchronous generators (PMSGs) with different rotor structures. The method is based on the so-called loading method, used widely for calculation of electromechanical characteristics of permanent magnet synchronous motors. In the developed calculation algorithm, the...
This paper presents the emulation of grid-connected wind energy conversion system based on the 30 MIPS Digital Signal controller (DSC) dsPIC30f3011. This system is composed by a three-phase permanent magnet generator, an AC to DC converter and a single phase Voltage Source Inverter (VSI). The inverter was driven using Space Vector Pulse Width Modulation (SVPWM) at a switching frequency of 18 kHz and...
This article reports on a finite element analysis assisted optimisation strategy for a moving iron, transverse flux, short stroke linear generator for free-piston Stirling engine applications. The optimisation goal is to maximise the power-to-weight ratio while maintaining preset power and efficiency levels. The topology and the implementation of the optimisation strategy are described, followed by...
An electric brake for wind turbine systems is proposed in this paper. Effective emergency electrical braking is needed if an overvoltage occurs due to grid failure. The derived circuits use high power thyristors corresponding to the high values of generated power from today's wind turbines. A practical confirmation with BLDC a generator is ongoing in the laboratory. The principle of operation is proved...
A method for efficiency optimization of boost converter applied in wind turbine with permanent magnet generator (PMG) is proposed in this paper. This method gives the best results when output power of generator is less than rated value. Its validation is verified through simulation and experimental results.
The paper analyses and compares some solutions of AC/DC converter stages in grid connected Wind Energy Conversion Systems (WECSs), using modular Permanent Magnet Synchronous Generators (PMSGs). The converter dispositions here analyzed are based on 3-phase diode bridge rectifiers, and consider also the possibility of a commutation in winding connections.
The paper analyses the control problem of the fixed speed wind energy conversion system based on the grid connected PMSG drive train and series converter located in its star point. It proposes unique approach to modeling of different types of sinusoidal PMSG in quasi-stationary operation. This provides basis for the development of the control algorithm whose primary function is active damping of the...
This paper presents a method to calculate various losses in wind turbine generation system (WTGS) as a function of wind speed, which is based on the steady state analysis. Variable speed WTGS using a doubly-fed induction generator (DFIG) and power converters (inverter and converter) is mainly considered in this paper. By using the proposed method, wind turbine power, generated power, generator losses,...
Low cost and low cogging torque are the most important aspects in the design of direct drive PM wind generators. In this paper a low cost PM wind generator with an irregular, parallel slotted stator is analysed with respect to cogging torque. The sensitivity of average torque and cogging torque to machine dimension variations are investigated. From this a method is proposed whereby regions of low...
This paper presents two wind converter structures based on an axial flux PM synchronous generator directly coupled to the wind turbine. For the generator model, a 2-D analytical solution of the Maxwell's equations in the machine is used. A rectifier model is developed, taking into account the diodes commutation mode. The first topology which supplies a RL load is composed by a small wind turbine,...
A 50kW linear permanent magnet generator with a novel topology has been designed and built. The main significance of the generator topology is that there is no attractive force between the stator and permanent magnet translator. The magnetic force between the magnets is reacted within a self supporting structure. The lack of magnetic forces closing the airgap and the modular nature of the generator...
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