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There are many applications employing image processing and/or control algorithms. Video surveillance, visual inspection of manufactured goods are among the examples. Self — driven cars are today one of the hottest topic. Using powerful image processing, control and learning technologies, self-driven vehicles appears to be just around the corner. Another possible application are robots in charge of...
The goal of this paper is to develop a S-function in MatLab Simulink for a symmetrical induction machine with squirrel cage rotor, in abc coordinates, for having direct access to rotor bars currents. We also use the circuit equivalent method (MEC), for having a hybrid mathematical model. This hybrid model is a simplified combination between abc frame model and MEC For the simulation model of induction...
This paper presents two links between wind turbine (WT) functional quantities. The first connection is the dependence of the mechanical angular velocity (MAV), corresponding to maximum power point (MPP), labeled as ωOPTIM from the maximum MAV, labeled as ωMAX, at no load operation. In this paper, it is shown that this report for a given WT-PMSG has a constant value and it does not depend on wind speed...
Efficiency improving methods, while maintaining the unity power factor, represent a major research topic in the PFC rectifiers' area. This paper introduces three novel highly efficient three-phase interleaved buck-type unity power factor rectifiers, namely the interleaved six-switch, the interleaved swiss and the interleaved eight-switch topologies. Compared to the switching strategy of the single-stage...
One major research topic in the PFC rectifiers area is represented by efficiency improving methods, while maintaining the unity power factor. In this paper, the single stage PFC rectifiers, namely the SWISS and 8-switch topologies, are investigated. New control strategy for the 8-switch rectifier proposed in [7] is introduced. Further, an interleaved switching strategy that enables cancellation of...
One major research topic in the PFC rectifiers area is represented by efficiency improving methods, while maintaining the unity power factor. The investigated topologies in this paper are the single stage versus interleaved eight-switch rectifiers topologies with or without considering the DC-link diodes. For the eight-switch rectifier a new control strategy is proposed in [8]. The proposed interleaved...
An increased research effort on the topic of unity-power-factor rectifiers has been lately noticed. In this paper two highly efficient three-phase buck-type unity power factor rectifiers are proposed to be studied: the conventional six-switch (single-stage) and its two-stage version, referred as the interleaved six-switch solution. They are in here compared in terms of efficiency and performances...
In this paper, we present a method for controlling a wind system consisting in a wind turbine (WT) and a permanent magnet synchronous generator (PMSG) so as to achieve the operation in the optimum energy efficient zone at time-varying speeds of wind. It analyzes the operation of a WT in the maximum power zone by changing the generator load, while the wind speed varies significantly over time. The...
The aim of this paper is to obtain the energy stored in the electric accumulators (EA), for a wind system operating at a time-variable wind speed. Mechanical energy captured by the wind turbine (VT) is converted into electric energy by permanent magnet synchronous generator, PMSG. The synchronous generator provides energy into an electric accumulator, by using a rectifier, in two ways: uncontrolled...
The main objective of this work is the determination of the relationship between wind speed and optimum speed. In this paper we determine the mechanical energy captured from the wind turbine (WT) and transformed into electricity by permanent magnet synchronous generator (PMSG) connected to WT. We can determine, through simulation, the mechanical angular speed (MAS), ωOPTIM and optimum load resistance...
In this paper a method for tuning the load of the photovoltaic solar panels (PVSP) based on measuring short-circuit current, ISC, and calculating the optimum current IOPTIM currents corresponding points of maximum power (MPP) is presented. Consequently, a permanent operation in MPP is ensured.
Due of its significant economical impact, Power-Quality (PQ) analysis is an important domain today. Severe voltage distortions affect the consumers and disturb their activity. They may be caused by short circuits (in this case the voltage drops significantly) or by varying loads (with a smaller drop). These two types are the PQ currently issues. Monitoring these phenomena (called dips or sags) require...
In this paper the control of wide speed range PMSM (permanent magnet synchronous motor with sinusoidal excitation) is investigated, with particular attention to the low power drives equipped with PWM-VSI (PWM voltage source inverters) without regenerative unit to supply the ac power from the mains to the dc link. An algorithm is proposed to generate the optimum reference current for four quadrant...
In general, low power induction motor drive systems are equipped with PWM inverter using a diode rectifier frond-end (has not a regenerative unit) to supply the ac power from the mains to the dc link. The main features of the proposed algorithm are the capability to generate the optimum torque, for four quadrant operation of drive system, over the wide speed range that is fed by PWM inverter equipped...
This paper proposes an original method of determining the maximum power function of a wind turbine at variable wind speeds. In this paper we determine the speed at which the system must work in order to obtain a maximum amount of electricity in a time interval of hours and days. For this purpose, we measure the wind speed and knowing the mechanical characteristic of the turbine, we calculate the optimum...
This paper deals with a current control method of a 8/6 Switched Reluctance Motor using a DSP TMS320C24×. The power converter used in the experiments was a classic one, with two transistors per phase. The current is sensed using two sensor resistances, one for a pair of phases. The current is measured only if the two transistors of the same phase are on. The current control loop is performed using...
Generally, the induction motors are designed for supplying conditions from an energetic source at which the supplying voltage represents a sinusoidal wave. If the machine is supplied by voltage inverters, in the wave of the voltage entering the motor, the superior time harmonics, of the order v = jmf ± k, j = 1, 2, …; k∊Z, occur. They are even, providing j is odd, and odd, providing j is even. The...
The inherent vulnerability to mechanical failures, extra cost, and size associated with external position sensors such as optical encoders and Hall sensors has motivated many researchers to develop sensorless control techniques for SRM drives. In this paper a flux linkage method and dual layer controller is developed to estimate rotor position and speed of a low-voltage Switched Reluctance Motor (SRM)...
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