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In this paper a new servo drive system for controlling permanent magnet linear synchronous motor is designed. In the design process, a special space vector modulation technique is applied to obtain a robust system against load disturbance. It also minimizes the current total harmonic distortion in the motor. A desirable and fast drive system with high quality speed tracking is proposed. Simulation...
This paper presents a comprehensive review for short circuit fault in electrical motors particularly PMSM. First different factors leading to this fault, such as various stresses on the motors, are proposed; then different fault diagnosis methods in induction motors, permanent magnet motors and brush-less dc motors are proposed. Advantages and drawbacks of these fault diagnosis techniques related...
This paper presents ultracapacitors (U) and lithium-battery connection with an energy management strategy based on the frequency distribution approach. The module of ultracapacitors is linked to DC-bus through the buck-boost converter, and that of the lithium-battery is connected to DC-bus without a converter. DC/AC converter (inverter) and electrical machine (EM) are used to emulate the Hybrid Electric...
In this paper two key features of synchronous reluctance motors (Syn-RM) are analysed and proposed for high electrical torque, power factor & efficiency using finite element method (FEM). The total width of the flux barriers is kept same for all studies throughout. The numbers of flux barriers, location of single flux barrier as well as location of multiple flux barriers are varied. FEM is used...
AC drives based on full digital control have reached the status of a maturing technology in a broad range of applications, ranging from low-cost to high performance systems. In the field of the drive of the electric machines, the elimination of the mechanical speed sensor can present an economic interest and improve safety of operation. With speed estimation, sensorless vector control is possible,...
This paper presents an adaptive neuro-fuzzy inference system (ANFIS) based speed control for indirect field oriented controlled induction motor drive. The obtaining of maximum torque and efficiency in the motor necessitates a successful nonlinear speed control method due to the non-linear structure of the system. In this work, a fuzzy logic controller (FLC) and ANFIS controller has been developed...
Due to the voltage low-frequency oscillation (LFO) of high-speed railway traction network and Electric Multiple Units (EMUs) coupling system, many EMUs in different EMU depots appear the traction blockade. First, the mathematical model and small-signal analysis model of EMUs-traction network cascade system (ETNCS) are built. Second, considering Auto-transformer (AT) leakage reactance, traction network...
The evolution of power semiconductors has contributed enormously to variable-speed wind turbine systems (WTS). In this study, a new method for power output calculation of variable-speed WTSs is proposed. The model is developed from the charging voltage equation of capacitors and is only a function of the rated power and the rated wind speed. It is validated on the manufacturer power curve of different...
This paper presents a methodology that can be used to model the electromagnetic behavior of large disk type air-core reactors when excited by fast transient voltages having a frequency content ranging from 10 kHz to 500 kHz. A lumped parameter white-box model is generated using the design details of the reactor. The model parameters are calculated analytically and verified by measurements and finite...
This paper uses an easy technique to calculate directly the parameters for induction motors, using single- and double-cage models. This technique has been applied in a wide sample of 2167 induction motors, where the parameters have been calculated from manufacturer data. The results show that this technique provides large errors in the start and maximum torque points, but on the other hand, it provides...
High efficiency and minimum components of the interleaved micro-inverter make them popular in industry. In this paper, a micro-inverter is designed for a 240 W panel in which a high speed MPPT algorithm is implemented in order to keep the reliability of the control system. Moreover, the associated control system is completely described. An optimizing method is applied to the interleaved micro-inverter,...
Selective harmonic elimination (SHE) is a widely used method to minimize the amount of total harmonic distortion (THD) in multilevel inverters. The main challenge associated with SHE method is to solve multiple variable high order nonlinear equations to obtain desired switching angles. To overcome this problem, a new online approach is provided in this paper which does not require solving complex...
This paper focuses on modeling and SOC (State of Charge) balancing control of lithium-ion battery energy storage system based on cascaded multilevel converter for both grid integration and electric vehicle propulsion applications. The equivalent electrical circuit model of lithium-ion battery module is established based on the relationship between SOC (State of Charge) and OCV (Open Circuit Voltage)...
This paper present the Field Programmable Gate Array (FPGA) realization of speed-sensorless Direct Vector Control (DVC) utilizing Extended Kalman Filter (EKF) with stator resistance estimation for Induction Motors (IMs). The EKF simultaneously estimates stator stationary axis components of stator currents and rotor fluxes, rotor angular velocity, load torque and stator resistance. The implemented...
Slider crank Wave Energy Converter (WEC) is a novel energy conversion device. It converts wave energy into electricity at a relatively high efficiency, and it features a simple structure. Past analysis on this WEC has been done under regular sinusoidal wave conditions, and a suboptimal energy could be achieved. This paper presents the analysis of the system under irregular wave conditions; a time-domain...
Current drivetrain design procedures for electric actuation systems operating in offshore conditions typically consider two major requirements: to provide sufficient steady-state and maximum motor torques. As a result of this, no information regarding the transient state (e.g. during motor acceleration) is utilized when selecting drivetrain components. This leads to potentially dangerous situations...
Permanent magnet synchronous machines are used in many industrial applications today. In particular, depending on the developments in magnetic materials, permanent magnet synchronous motors rapidly developing in recent years have found themselves a widespread coverage in applications because of their outstanding features. When the research in the literature is surveyed, it is observed that the vector...
This paper is focused on a control method to improve the THD factor of a bidirectional flyback inverter. The inverter structure, presented in a previous paper of the authors, contains a DC-DC converter tracking a rectified sinusoidal voltage waveform, and a full-bridge to obtain the AC waveform. The flyback inverter has a zero in the right half plane for the output voltage transfer function in continuous...
The paper proposes a system developed to provide heat for a greenhouse using parabolic trough collectors (GHPTC). The GHPTC control system has the goal to maintain the temperature inside the greenhouse at a desired level, with the actuating variable the flow of the conducting fluid through collector pipes. Considering this aspect, the proposed model takes into account as an output variable the internal...
This paper presents a mathematical model used to calculate the symmetrical components depending on load current (actual values and phases) in low voltage electrical distribution networks. Based on the mathematical model proposed, transformer losses were evaluated for two windings transformers. Case studies dealt with non-symmetric mode due to load unbalance in the low voltage distribution network...
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