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Currently, there is significant attention being paid to the development of high-speed machines including motors and generators. In particular, permanent magnet machines are gaining more traction due to their outstanding efficiency, high power density, small size, low weight, simple mechanical construction, easy maintenance and good reliability. The higher the motor speed, the smaller the electric...
With advantages of low emissions, fuel flexibility, high efficiency and energy saving, micro turbines (MTs) are one of the most important technologies for distributed generated systems (DGSs) [1,2]. With many advantages such as high power density, simple structure, and higher efficiency, high speed permanent magnetic generator systems (HSPGSs) attract more attentions from the world wide researchers...
As one of the most important kinds of distributed generation systems, the micro turbine generation system can be flexibly installed near the end user, and becomes an important trend of development in DGS gradually. The high speed permanent magnetic generator (HSPMG) can be properly applied in a micro turbine generation system and benefits the system from high efficiency, high power density, simple...
Available sensorless speed control strategies of doubly fed induction generator (DFIG) usually fail around the synchronous speed or limited by the operation mode (motor or generator). A novel control strategy is proposed in this paper. It uses the stator flux magnetizing current to estimate the rotor position and speed. This strategy works properly in the whole speed range. The principle of the speed...
This paper analyzes the stator flux oriented vector control theory for doubly fed induction generator, control strategy of no-load cutting-in based on grid voltage feedback and control strategy of grid connected based on speed feedback are used in this system, the arithmetic of maximum power point tracking independent of the turbine characteristics and air density is used in this system. The results...
A variable-speed constant-frequency (VSCF) doubly-fed induction generator (DFIG) system using a back-to-back PWM converter connected between the generator rotor circuit and the power grid is investigated by the authors. By using a stator-voltage oriented vector control scheme, the independent control of the active and reactive power generated by the induction machine is achieved, based on which, the...
In this paper, a test-bed built for the experiments of variable-speed constant-frequency (VSCF) wind power generation is described. The test-bed is composed of a doubly fed induction generator (DFIG), a VVVF inverter driven squirrel motor for wind turbine simulation, dual-DSP-based controllers, as well as a PC-based data-acquisition and control system. In this system, a pair of bidirectional PWM voltage-source...
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