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This paper presents a new speed-sensorless vector control drive system for induction motor. In order to produce low harmonics in output voltage and current, reduce the torque fluctuation, and avoid the high voltage jump in switching time, the system utilizes three-level inverter to supply power for the induction motor and a SVPWM scheme with neutral point voltage balance strategy is applied for the...
This paper studies the effect of the inverterpsilas dead time on the dynamic characteristics of the Permanent Magnetic Synchronous Motor (PMSM) systems. Considering the harmonic magnetic field, the state space model and transfer function are given for the PMSM system. Furthermore, the effect of the dead-time on the output voltage of inverter is analyzed. The mathematical model, considering the dead-time...
In the paper, a novel principle of variable reactor with a transformer and inverter control is proposed. A transformer with air gap is chosen and its primary winding is connected in series or parallel in power utility, the primary winding current of the transformer is detected and functioned as the reference signal. A voltage source PWM inverter is applied to produce a voltage, which is a controlled...
In order to expand the wind energy capture range, promote its global efficiency and fault tolerance and reduce its cost, a new direct-driven wind energy conversion system with multiple armature-winding hybrid-excitation generator is presented in this paper. The structure of the generator is described. Both operating principles and control strategies of the system are analyzed in detail. With the accurate...
This paper presents a design of a voltage controller of single-phase voltage source PWM inverter with LC filters. To compensate voltage distortion from non-linear loads, the resonant controller has been proposed. However, the design of the control system with the resonant controller is not clear. So we propose the design with the Coefficient Diagram Method (CDM).
The Selective Harmonic Elimination (SHE) PWM technique has become a significant PWM method for less switching loss for three-level neutral-point-clamped (NPC) inverter. This paper introduces an online optimization approach to the SHEPWM technology based on genetic algorithm and BP neural network. The method doesnpsilat need to preset the initial values and to predict the trend of these values over...
Compared with their three-phase counterparts, multiphase machines with phase number n ges 5 have many advantages like lower torque pulsation, higher power density, better fault tolerance, etc. Due to these advantages and the increasing demands on high performance and high power adjustable speed drives, the research on multiphase drives has experienced a significant growth since the end of last century...
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