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High-speed nonpolar InGaN/GaN LEDs on free-standing GaN substrates with a peak emission wavelength between 455–465 nm were fabricated. A large frequency modulation bandwidth of 524 MHz and an output power of 1.5 mW are obtained.
In this paper keeping position and zero torque (KP-ZT) control of switched reluctance motor (SRM) drives is proposed to avoid any movement when used for charging reactor in electric vehicles. A sliding mode position control technique as an outer loop and zero torque control method as an inner loop are used to attain this. Whereas, power factor correction (PFC) and voltage regulation is achieved with...
Permanent magnet synchronous motors (PMSMs) are suitable options for high-performance applications due to their potential of high power density and torque smoothness. Nevertheless, there are some factors affecting this feature by producing unwanted pulsating torque. One of the causes of torque ripple is the presence of harmonic components in motor back EMF. This paper has presented a multiple reference...
In this paper, a two-stage power converter based on current source rectifier (CSR) is proposed to improve the power factor of Switched Reluctance Motor (SRM) drives and Battery Charging Capability in Regenerative Mode. CSR stage in the input of SRM converter, eliminate dc link's capacitors and create the capability of energy saving in regenerative operation mode of SRM drives. The space-vector modulation...
This paper investigates the problem of high torque ripple in current controlled switched reluctance motor (SRM) drives. Torque ripple reduction bellow the base speed of the motor is studied through adjustment of both turn-on and turnoff angles. A multiobjective optimization function is used to determine the proper turn-off angle in each operation point. Based on a proposed approach on intersecting...
This paper presents a modern control system for switched reluctance motor (SRM) drives. The control system is based on computational model of mammalian limbic system and emotional processes (BELBIC) which is presented as speed controller of the motor drive with attention to torque ripple decrease. In this work, a novel and simple model of SRM drives control plant is achieved by using the intelligent...
This paper presents a high-performance nonlinear controller for Switched reluctance machine (SRM), acting as a speed regulation motor drive. We use a cascaded torque control structure for torque ripple minimization. In a cascaded control structure, accurate torque control requires inner current controller. Passivity-based control (PBC) approaches is proposed for current control purpose. By using the...
Ever since the existence of negative refraction by metamaterial prisms was demonstrated by Pendry, Smith and others about a decade ago, the subject has received a tremendous amount of attention from many researchers around the world. A special class of MTMs, namely double negative or DNG type of artificially synthesized materials, has been used not only to design superlenses, but to also enhance the...
Increasing wind power penetration into power grids is desirable because of its environmental and other benefits, unfortunately wind farms could cause serious voltage stability problems due to their output variability and intermittency. So this paper proposes a method that determines the optimum penetration level of wind plants into power systems. To achieve this purpose, a nonlinear optimization problem...
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