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Recently, the size of wind turbines is increased. As a result, the permanent magnet synchronous generator (PMSG) plays an important role because of its simple structure and high efficiency. This paper proposes a torque and pitch control scheme for variable speed wind turbines. A torque controller is designed to maximize the output power below the rated wind speed and a pitch controller is designed...
This paper presents a comparative study on four different structures of variable speed constant frequency (VSCF) wind power generator. The analysis results show that the direct-driven permanent magnet (PM) generator has good performance but high cost; the doubly-fed induction generator has low cost but poor reliability; the half-direct-driven PM generator and doubly-fed brushless generator may be...
The electromagnetic damp characteristics, namely, the characteristics of electromagnetic torque varying according to angular velocity, of permanent magnet synchronous generator (PMSG) were derived by phasor method. The relationships between the characteristics and PMSG interior parameters were discussed. Transient process and electromechanical time constant were proposed. Both the analysis result...
This paper describes the optimal control of variable-speed permanent magnet synchronous generators system. In order to maximize generated power, permanent synchronous generator is controlled by a maximum power point tracking (MPPT) control and maximum efficiency control. A sensor-less scheme is proposed for MPPT. Experimental results have been carried out to verify the benefits of the proposed system.
A novel maximum power point tracking (MPPT) strategy is presented in the paper. When wind speed varies, the wind turbine could obtain a big torque difference by adopting the novel strategy to achieve the aim of tracking the optimum turbine speed fleetly. The square wave permanent magnet synchronous generator (PMSG) is adopted in this paper for considering the characteristic of the diode rectifier-Boost...
This paper presents a detail analysis of flux control for high performance and high speed operation of an interior permanent magnet synchronous generator (IPMSG) used in the power generation. In this work, an algorithm for flux control is proposed to achieve optimum efficiency over the IPMSG. When the IPMSM worked as a generator, is almost in the constant power region meanwhile the flux control for...
The 2-D transient field model of Interior permanent magnet generator (IPMG) which is driven by wind turbine is set up and analyzed by the software of Ansoft. As a result, with the size of top rake of magnetic pole changing, the variation of starting resistant moment is obtained. Consequently, theoretic reference for minimization of starting resistant moment of IPMG is offered.
In this paper, an analytical modeling of an axial flux permanent magnet synchronous generator (AFPMSG) is investigated. The proposed model is based on an exact two dimensional (2D) solution of the magnetic field in the generator. Then, the generator's quantities such as the phase electromotive force (EMF), the cogging torque and electromagnetic torque are written based on the developed exact 2D solution...
This paper presents aspects of the design solution for a high speed, high efficiency permanent magnet machine used as a motor/generator (M/G) unit in a flywheel energy storage system. The motor is operated in a vacuum with passive cooling; thus the right choice of permanent magnet properties and ability to withstand demagnetization due to the temperature variation and armature reaction is important...
Fluctuations in the torque acting on the rotor in a rotating electric generator i.e., cogging, gives unstable rotor motion and can venture reliable operation of the machine. Cogging also gives a similar fluctuation in the output power. This paper presents a study of the cogging force in a linear permanent magnet generator. A constant output power is possible in a rotating machine with three phases...
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