Owing to low voltage stresses, wide range of input and the same polarity output voltage, double-switch buck-boost converter (DSBBC) is a popular choice achieve dc/dc conversion in photovoltaic generations (PV), power factor correction (PFC), portable devices so on. Combined control (CC) makes DSBBC operate efficiently, but large ripples are unavoidable during mode transition. With two equal dut...

The objective of this paper is to control the phase shifting by applying a bias DC voltage and changing the mechanical characteristics in electrostatically-actuated micro-beams. This problem can be more useful in the design of micro-phase shifters, which has not generally been investigated their mechanical behavior. By presenting a mathematical modeling, Galerkin-based step by step linearizatio...

Multi-phase (more than three phases) drives possess several advantages over conventional three-phase drives such as: reducing the amplitude and increasing the frequency of torque pulsations, reducing the rotor harmonic currents, reducing the current per phase without increasing the voltage per phase, lowering the dc link current harmonics and higher reliability. By increasing the number of phas...

seed purification is one of the important agricultural processes to obtain high quality seeds. using modern technologies help producers to do this process with higher precision and accuracy. in order to separate seed impurities, a separation machine called tribo-aero-electrostatic separator was designed. the machine was evaluated by separating impurities of flixweed (descuriania sophia). primar...

This paper develops a Finite Element Model (FEM) for 138 kV High Temperature Vulcanized (HTV) Silicone Rubber (SiR) transmission insulator in which, first step, leakage current is calculated different non-uniform continuous and discontinuous pollution deposits then features based on the phase shift between applied voltage are extracted each kind of layer to identify existence dry bands surface....

This paper presents an interface system based on the Dual Active Bridge (DAB) converter for Photovoltaic (PV) arrays. Two control strategies are proposed for the DAB converter to harvest the maximum power from the PV array. The first strategy is based on a simple PI controller to regulate the terminal PV voltage through the phase shift angle of the DAB converter. The Perturb and Observe (P&O) M...

The aim of this project is to model a six step discontinuous current mode inverter fed to a Permanent Magnet Synchronous Motor (PMSM) drive using MATLAB/SIMULINK. The dq-axis Voltage-Current and Torque relation in terms of machine parameters are used along with a six step 120 degree mode inverter and gate drive using MATLAB/SIMULINK. There is also a provision for easy changes to the machine par...

Polycrystalline copper sulphide (Cu x S) thin films were grown by ultrasonic spray pyrolysis method using aqueous solutions of copper chloride and thiourea without any complexing agent at various substrate temperatures of 240, 280, and 320°C. The films were characterized for their structural, optical, and electrical properties by X-ray diffraction (XRD), scanning electron microscopy (SEM), ener...

Phase shifting transformers (PSTs) are currently widely used in power systems to control flow. In this manuscript, the results of asymmetrical PST (APST) with in-phase (called controllable PST-ACPST) were compared, allowing both longitudinal and quadrature voltage. The MATLAB simulation model ACPST was built obtain influence selected models for parameters. Then 30A laboratory device laboratory....

renewable energy sources like wind, sun, and hydro are considered as a reliable alternative to the traditional energy sources such as oil, natural gas, or coal. this paper describes modeling and simulations to determine a method for the power performance evaluation of autonomous wind turbine system. a speed control regulator is utilized to control the dc bus voltage. the inverter gate’s signals...