The present study proposes a new, highly efficient fractal antenna with ultra-wideband (UWB) characteristics. proposed patch offers wide simulated operating band that reaches 8.3 GHz, gain varies between 2.47 and 7.73 dB throughout the range, high efficiency comes to 98% due modifications made geometry. carried out on are composed of several stages, circular ring extracted from in which four rings integrated and, each ring, other reduction factor 3/8. To further improve adaptation antenna,...

Abstract To improve the robustness and performance of dynamic response a cage asynchronous motor, direct torque control (DTC) based on sliding mode (SMC) is adopted to replace traditional proportional-integral (PI) hysteresis comparators. The combination proposed strategy with sinusoidal pulse width modulation (SPWM) applied three-level neutral point clamped (NPC) inverter brings many advantages such as reduction in harmonics, precise rapid tracking references. Simulations are performed for...

Accurate speed feedback is always required to achieve high performance and good accuracy control for an asynchronous motor. The use of conventional direct sensors involves additional electronic components, wiring space, frequent maintenance careful assembly, which undermine the robustness inherent reliability drive. To overcome aforementioned drawbacks, this paper proposes effective sensorless torque algorithm motor combines a sliding mode observer model reference adaptive system rotor flux...

This paper presents the design of a multiband microstrip patch antenna operating at seven frequencies i.e. 2.4 (Lower Worldwide Interoperability for Microwave Access (WiMAX), 5.3 (Wireless local area network (WLAN)) and 9.1-10.2 GHz (X-band) frequency bands. The radiating element is backed by 1.6 mm thicker FR4-epoxy substrate having dielectric constant 4.4 loss tangent δ = 0.02. fed through 50 Ω line. shape derived from basic rectangular inserting circular hole inside antenna. During...

The modern microwave communication system demands good antenna performance with variety of application. One should serve the purpose many antennas to reduce resource cost and installation cost. For this reason, concept multiband arises. In paper, attention has been given towards design a new multilayer rectangular microstrip patch antenna. A modified compact size line-feed is proposed for operation in UMTS (Universal Mobile Telecommunications System), ISM (Industrial Scientific Medical),...

The Direct Torque Control (DTC) technique was designed to provide high performance for a three-phase asynchronous motor’s behavior by accurately controlling the flux and torque of latter. However, this conventional DTC generates strong ripples at level variation switching frequency since it uses hysteresis comparators, reason, sine-triangle pulse width modulation (SPWM) has been proposed improve it. use Integral Proportional Regulators (PI) allows generation voltage direct quadrature...

Control of a class single-input single-output systems (SISO) described by linear vector difference equations with constant but unknown parameters is discussed. The minimum variance control for presented. A self-tuning regulator based on then proposed. It uses Recursive Least Squares (RLS) estimator and controller obtained directly from the current estimates.

In this paper, the Adaptive Generalized Predictive Control is designed to control a heat exchanger pilot plant. The standard (GPC) algorithm presented. then applied achieve set point tracking of output A Single Input Output (SISO) model used for purposes. parameters are estimated on-line using an identification based on Recursive Least Squares (RLS) method. performance proposed controller illustrated by simulation example Obtained results demonstrate effectiveness and superiority algorithm.

<p>To highlight the conceptual aspects related to implementation of techniques optimal control in form state, we present this paper, identification and temperature humidity air inside a greenhouse. Using respectively an online based on recursive least squares with forgotten Factor method multivariable adaptive linear quadratic Gaussian approach which advanced technique (LQG) is presented. The design controller parameters state models identified directly from measured greenhouse data....

In this paper, a complete and comprehensive study has been explored on the design performance analysis of grid side multi-level inverter in high power renewable energy. The LCL-Filter dq-PLL structure plus multi-variable band-pass filter (FMVPB) must be used as appropriate topologies to comply with interconnection requirements. Details mathematical models simulation using Matlab-Simulink/SimPower Systems for all these components have given evaluated. By providing future users tool control...

Direct Torque Control is a well-known high-performance technique used in asynchronous motors. This conventional which uses hysteresis comparators suffers from high torque ripples and variable switching frequency. The most common solution to those drawbacks use the modulation order have constant paper presents modified direct control of motor scheme associated sinusoidal pulse width PI regulators generate system voltages. In other hand instead using two-level inverter, fed by three-level...

<span>This letter presents the design, simulation, and measurement of a novel multiband fractal circular antenna for wireless applications. In we used where took ring. Then, in first iteration, added new ring divided into two same size. For second size after dividing it halves. third four. Due to resonator defection, were able reduce starting from 60×70×2 mm<sup>3</sup> 50×50×1.6 mm<sup>3</sup>, get frequency 2.48 GHz, generated bandwidths with high gain that...

Small hydro power is one of the most important renewable energy in world. It does not encounter problem population displacement and as expensive solar or wind energy. However, small electrical generating units are usually isolated from grid network; thus, they require control to maintain constant for any working conditions. This paper presents a flow approach speed turbines. Power can be controlled by controlling amount volume water running into turbine. In this study, adaptive predictive...

In this paper, the Adaptive Generalized Predictive Control is designed to control a heat exchanger pilot plant. The standard (GPC) algorithm presented. then applied achieve set point tracking of output A Single Input Output (SISO) model used for purposes. parameters are estimated on-line using an identification based on Recursive Least Squares (RLS) method. performance proposed controller illustrated by simulation example Obtained results demonstrate effectiveness and superiority algorithm.

In this paper, the design process and performance analysis of Adaptive Linear Quadratic Gaussian (ALQG) control are presented. The controller is expected to speed separately excited DC motor (SEDCM). Implement law performed trough use separation theorem, which involves a Kalman estimator linear quadratic separately. A robust identification algorithm used for online estimation SISO model's parameters. Simulation results show that proposed has remarkable tracking reference trajectory while at...

The installation studied in this work consists on applying the direct torque control (DTC) based sliding mode (SM) to an induction motor which will be supplied once by a conventional two-level inverter and second time NPC three-level inverter, with estimator model reference adaptive system (MRAS) combined method. application of strategy acquires great robustness system, whereas adoption considerably reduces ripples while improving waveforms. Finally, conjunction MRAS SM accentuates...

We propose in this letter, a new reconfigurable triangular antenna design with triangular-shaped slots. The proposed idea allowed us to have successfully multiband operation based on PIN diodes. got better results terms of gain and bandwidth, we possess high achieved 5.23 dB ultra-wideband witch can reach 1.68 GHz, thus, the operates efficiently Universal Mobile Telecommunications System (UMTS) (1.92-2.1 GHz), Broadband Personal Communications Service (PCS) (1.85-2 S-band (2-4 Worldwide...

This article presents the design, simulation and implementation of a didactic inverter based on IGBT. The inverter, controlled with digital pulse width modulation strategy 'DSPWM' by DSP card from eZdspTM F2812 platform, feeds balanced three-phase resistive load. To prove performance efficiency realized fair comparison its experimental results those compact industrial module 7MBR15SA120 is also presented for different parameters control strategy.

This paper treats in detail the performance process of an optimal full power converter topology that's suitable for direct driven megawatt hydraulic energy conversion system. Simulation results approve high efficiency suggested using three-phase uncontrolled rectifier plus three level boost 3L-DC/DC followed by three-level neutral-point clamped inverter (3L-NPC) and its control strategy. Since it can be rise greatly settling time to reach quickly steady state progress more waveforms outputs...