Magnetic levitation (Maglev) systems are widely employed in the industry especially mechatronics for precise positioning and suspension. They inherently unstable having nonlinear models with uncertain parameters exposed to external disturbances. Therefore, high-performance robust control designs recommended these systems. An Adaptive Variable Structure Controller based on barrier function (AVSC...

The design process and complexity of existing safety controls are heavily determined by the geometrical properties environment, which affects proof convergence, scalability, performance robustness, numerical efficiency control. Hence, this brief proposes a variable structure control to isolate environment’s from structure. A super-twisting algorithm (STA) is used achieve accurate trajectory tra...

Renewable energy sources are developed as a result of the increased demand for electrical power. The nature solar source is DC. DC many applications needs to be converted AC. inverter used convert power from Total harmonic distortion (THD) significant concern with inverters. Multi-level inverters reduce THD. stair output voltage multi-level not only reduces THD but also switches' stresses, so l...

Various commutation techniques, such as forced commutation, ignition angle control, and symmetrical have been developed to improve the input power factor harmonic level. However, all of these techniques will produce only one pulse per half cycle converter current, consequently, lowest order is third harmonic. A comparative study active filter converters between single PWM control has investigat...

This paper presents a mathematical model of 255 kW grid-connected solar photovoltaic (SPV) system. To study the performance characteristics SPV system, new hybrid adaptive grasshopper optimization algorithm with recurrent neural network (AGO-RNN) control technique was implemented. Furthermore, power quality at point common coupling (PCC) has been studied using conventional (PSO) and proposed AG...

In this paper, Artificial Neural Network (ANN) technique has been used for the estimation of voltage THD (Total Harmonic Distortion), current THD and power factor, mainly from input and output measurements of five different chorded induction motors fed from a pulse width modulation inverter voltage supply. A sinusoidal pulsewidth modulation (SPWM) inverter feeding five different chorded three-p...

A bridgeless single phase ac-dc rectifier based Cuk derived converter topology fed BLDC motor is proposed to improvepower factor at the AC mains near to the unity with low THD for PFC applications. It utilizes one control signal over the whole line cycle. In addition, the proposed converter exhibits low inrush current and low magnetic emissions as classical Cuk topology. The partial elimination...

In this paper, minimization of the total harmonics (THD) present in the output voltage of multilevel inverters is discussed . In order to reduce the harmonic contents of the inverter's output voltage the best approach is THD minimization. In multilevel inverters, if fundamental frequency switching strategy is considered,(each switch turning on and off once per output cycle), the switching angle...

Laser photoionization and ligand photodissociation in Ln(thd)(3) (Ln = Eu, Tb, Gd; thd = 2,2,6,6-tetramethyl-3,5-heptanedionato) are studied in a molecular beam via time-of-flight mass spectrometry. The fragmentation patterns are strongly wavelength dependent. With 355 nm excitation, the mass spectrum is dominated by Ln(2+), Ln(+), and LnO(+) fragments. The bare Ln ions are believed to arise fr...