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This paper proposes a simple technique to get maximum power of wind energy conversion system (WECS) without using sensors for wind and rotor speed of the permanent magnet synchronous generator (PMSG). It uses the measurements of DC current and DC voltage to obtain maximum power point tracking (MPPT) by controlling the duty cycle of the DC-DC boost converter switch. Moreover, a PI control is employed...
The drive system of a variable speed pump-storage power station consisting of a doubly-fed induction machine with a 3-level voltage source inverter feeding the rotor is presented. The advantages of variable speed pump-storage power stations are outlined. After a short comparison with the classical cyclo-converter solution the voltage source inverter solution is described in detail covering various...
Sensorless field oriented control (SFOC) of induction motor (IM) drives estimate the mechanical position of the rotor and the field orientation by means of the motor voltage and current measures. In many cases, the motor voltages measures are substituted by the inverter commands, and the flux estimation is based on the stator model of the machine, i.e. the integration of back EMF voltages. With closed...
A predictive digital control algorithm, suitable for synchronous reluctance motor drives, is presented in the paper. The proposed algorithm, which is a direct digital control one, is implemented in rotor coordinates. It is a recursive algorithm which allows the imposition of the reference values of d and q current components. The digital control system directly synthesizes an output vector which imposes...
A predictive control algorithm for PMAC motor drives is presented in the paper. The proposed approach, implemented in rotor coordinates, allows to impose the reference values of d and q current components using recursive algorithms. The output of the digital control system directly imposes the timing control of the inverter by means of on/off state of the switches. Due to the time required for the...
We have investigated a method to regulate the voltages in the secondary windings of an induction machine stator with multiple windings. By introducing one or more triple-n harmonics in a three-phase machine, the rectified output voltage of one or more grounded-wye windings can be controlled and regulated. Voltage regulation is achieved through triple-n harmonic current injection, so there is no net...
Following previous studies on stator and rotor field orientation for low power drives, the simplification of air gap field oriented control methods was investigated for induction motor drives with voltage-source inverters. Firstly, a general control law for voltage input is established using input-output linearization. This sophisticated procedure is then the subject of simplification steps, leading...
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