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In this paper, an Adaptive PID with dynamic sliding mode control technique is proposed to control the speed of a separately excited DC motor. Speed control is done using Sliding mode control (SMC) and Dynamic sliding mode control techniques and to overcome their drawbacks the new controller is designed. The performance of the designed controller is evaluated via MATLAB simulations using linear model...
A multi-level inverter configuration for 4n pole induction motor drive is presented in this paper. This topology is developed using three two-level inverters and two isolated dc sources. Among these three two-level inverters one inverter is switched at fundamental frequency and remaining two inverters are switched at higher frequency. Two isolated dc sources with equal magnitude are used in this topology...
This research is design and construct of Sine Pulse Width Modulation (SPWM) 3-leg voltage source inverter for controlling speed of asymmetrical two-phase induction motor. ICs No. IRF2130 are used for motor driving part. The characteristics of output current signal are nearly closed to sinusoidal pattern, so that low harmonics and high efficiency for motor control are obtained. The Sine PWM switching...
A two-phase permanent magnet synchronous motor is designed for using an AC-AC converter drive system fed from a single-phase source. This motor and drive system are proposed to replace with a traditional single-phase motors fed by electricity grid for improving the efficiency of the system. The proposed AC drive system can be connected directly between AC grid and motor without requiring any storage...
Selective harmonic elimination (SHE) is a well-known PWM technique applied voltage source inverters (VSI) to control fundamental voltage and eliminate chosen harmonics. This technique requires the determination of optimum switching angles by solving the nonlinear equation set and a look-up table stored the switching times in a real-time application. This paper presents a hybrid genetic algorithm (GA)...
In modern drive applications fed by voltage source inverters, monitoring systems are of advantage to reduce the maintenance costs and prevent outages. The proposed insulation monitoring method detects stator insulation defects by evaluating the current's transient response after step excitation by the inverter. Due to fast switching of the voltage source inverter at high output voltage dv/dt rates,...
Electrified drive trains for tractors open great possibilities of raising performance in heavy agricultural operations due to high controllability and drive torque feedback. However, electric motor characteristics do not completely satisfy traction requirements in agricultural operations which imply high torques at low speeds as well as high transport speeds. The paper proposes to apply a winding...
Fault detection is one of the most important tasks in fault tolerant converters. In this paper, a new method is proposed to detect the faulty cell in a cascaded H-bridge multilevel inverter. The detection technique is based on comparison of the output voltage with reference voltage made by using switching control pulses and DC-Link voltage. Because of the simplicity of this method, it is possible...
This paper deals with a new ZCS bidirectional buck-boost converter for the energy storage applications. The conventional buck-boost converter is upgraded with an auxiliary resonant circuit to obtain the zero current switching during commutation of main IGBTs. The key advantage of this proposed topology has the reduced switching losses, as all the switching devices are operated in ZCS soft-switching...
Recently, reduced switch-count converters have garnered exceptional attention in power electronic systems due to the diversified advantages such as low cost, low weight and volume, and high reliability offered by them. In this paper, a novel design of single-phase inverters with a reduced number of switching devices is proposed based on the single-ended primary-inductance converter (SEPIC). The proposed...
This paper describes a new application of SEPIC (Single Ended Primary Converter) and Cuk converter for distributed generation systems. A DC/DC converter configuration based on a combination of both converters is proposed. In the resulting topology the switching node is shared by the SEPIC and Cuk converter, since they have the same instantaneous duty cycle. This topology allows the connection of renewable...
This paper presents a new stable fuzzy-logic-control (FLC) based maximum power point tracking (MPPT) algorithm for stand-alone photovoltaic (PV) system. The proposed method uses the power to voltage variation and voltage variation as the inputs, which significantly simplified the computation. The proposed FLC is compared in the simulation with the conventional perturb and observe (P&O) method,...
Renewable energy sources entail the power electronics inverters are the orbit of research objectives for optimum operation. Two commonly used inverters exist; the current source inverters (CSI) and the voltage source inverters (VSI). The first one supports only the boost capability and the other supports the buck capability, but due to the high variation of the output voltage of these renewable energy...
Bidirectional power flow in energy storage facilities is common and required. Energy supply from energy storages and energy imbursement back to the storages and preferably at high-efficiency are basic operations for these kinds of equipment. Since the boom growth on uninterruptable power supplies for critical loads and electric vehicles, storages, especially batteries, are in deep demands nowadays...
This paper presents experimental results for a three-phase direct ac-ac converter based on switched capacitor principle in delta and wye configuration. This converter employs only capacitors and switches in the power stage, it has a fixed gain, it operates in open loop with constant duty cycle and constant switching frequency and the topology is bidirectional. One advantage of the proposed converter...
Galvanically isolated drivers offer a good protection of the control part against EMI caused by the switching transients of the high power electronic devices. The proposed concepts aims to reduce the component count and building height by using one integrated magnetic core for the power and signal transformer. Furthermore, a communication link between the primary and secondary side is implemented...
The versatile buck-boost converter presents interesting features, such as continuous input and output currents and ease of control in both step-up and step-down models. This paper addresses its use in low voltage photovoltaic applications where the nonlinear current source-like I-V static characteristic of the PV module requires the inclusion of an input capacitor in the original power stage structure...
In this paper space vector model of a fifteen-phase voltage source inverter (VSI) is presented. The space vector Pulse Width Modulation (SVPWM) of a fifteen-phase voltage source inverter (VSI) with the aim of producing sinusoidal output waveform, is illustrated. Generalized space vector theory is used to model the inverter and the SVPWM. As per the general inverter switching theory there are 215 =...
Reactive power handling by distributed power generation systems (DPGS) was prevented in the past in order to avoid additional power losses in the distribution feeders, however several new national grid codes request reactive power generation/absorption by the converters of active users. Actually almost no literature is focused on power losses analysis in case of reactive current circulation from the...
Interleaving of voltage source converter legs enables higher output currents per phase, effectively increasing the power rating without increasing semiconductor ratings. Different switching patterns between the converter legs increase the number of Thevenin output voltage levels and, hence, the quality of the waveform but also generate circulating currents within one phase. This paper proposes a controller...
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