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Induction machines are critical components in several industrial processes and are frequently integrated in commercially available equipments. The reliability of an induction motor is of great Importance in industrial as well as commercial, aerospace and military applications. in This paper two kinds of induction motor faults, stator short circuit and broken rotor bar fault, are investigated. The...
This paper deals with off-shore wind park model identification for output power prediction purpose. The investigated solution is based upon identifying the so-called wind deficiency factor for each turbine and for each wind direction sector. This is done by employing the effective wind speed concept that can establish a link between output power of a wind turbine and the meteorological mast measures...
The paper is concerned with field-oriented control (FOC) and vector control (VC) of a promising brushless doubly-fed reluctance generator (BDFRG) technology for adjustable speed wind turbines with maximum power point tracking. The BDFRG has been receiving increasing attention because of the low capital and operation & maintenance costs afforded by using partially-rated power electronics and the...
This paper discusses effects of short control period on control characteristics in an ultra-high-speed permanent magnet synchronous motor (PMSM) drive system based on direct torque control (DTC). High-performance control in ultra-high-speed region requires fast response time of control system and also short computation time. The DTC-based drive system has several advantages, including simple structure...
This work is dedicated to the robust fault detection and tracking problem for a UAV system with external disturbances. A quadrotor modelled as a Linear Parameter Varying system (LPV) is considered as a target to design and to illustrate recent advanced control methods. Firstly, the fault detection problem is addressed by considering the design of a robust fault detection observer with H∞ performance...
This paper describes the computation of electromechanical forces and torques in the surface-magnet synchronous motor. An analytical model of the machine is developed and tested. The results are compared with those obtained using finite-element analysis, and those obtained experimentally.
A self healing (SH) control framework is proposed in this paper against actuator stuck faults. For unmanned helicopters (UHs), the framework is composed by an active fault-tolerant control (FTC) system and reference redesign. The FTC system is based on linear-quadratic regulator (LQR) and pseudo inverse technique, which can compensate stuck faults of the post-fault system with output analytical redundancy...
In this paper the stability of voltage and frequency in Doubly fed induction generator for a variable speed wind turbine in stand-alone mode is analyzed and simulated. Important equations governing on the stand-alone structure has been discussed and then the control loops of Rotor Side Converter (RSC) and Load Side Converter (LSC) are analyzed and designed. Two methods of direct and indirect stator...
This paper proposes a new high-bandwidth speed sensorless direct torque control of interior permanent magnet synchronous motor drives for wide speed range operation, including standstill. The sliding mode observer is used for joint stator flux and rotor speed estimation at all speeds. At low speeds, the sliding mode observer is enhanced by the fundamental PWM excitation technique, which is used to...
This paper presents an adaptive fuzzy control strategy to solve the problem of trajectory tracking for quadrotor unmanned aerial vehicle in the presence of model parameters uncertainties and external disturbances. A fuzzy system is employed to approximate directly a model based control law developed using backstepping techniques. The adaptive laws for tuning the adjustable parameters of the fuzzy...
This paper focuses on the synthesis of Linear Parameter Varying (LPV) control based on two different LPV control structures. In the first structure the H∞ self-Gain-Scheduling (GS) control technique is used to obtain the LPV controller and in the second method, the composite quadratic Lyapunov function and the quadratic cost function are used to find the optimal state feedback gain. Finally, a six-degree...
A possibility of using the sliding mode technique for elimination of the influence of instability voltage source on the stand-alone drive behavior is discussed. For the AC drive that has an exterior permanent magnet synchronous motor and a classical two-level voltage source inverter the conditions of the sliding mode existing guaranteed elimination is presented. The designed control is analyzed.
This paper provides an improvement in sensorless control performance of surface permanent magnet synchronous motor(SPMSM). One method of the rotor position estimation by the complex number model based position estimator is proposed for the sensorless control of SPMSM. And, in order to eliminate the position estimation error that may be occurred by the uncertainty of motor parameters, a position type...
Asymmetrical voltage conditions in the grid can have significant negative effects on the performance of wind energy conversion systems (WECS) equipped with doubly-fed induction generators (DFIG). Transient peaks as well as steady-state second-order and higher frequency harmonics are introduced in the active and reactive output powers, in the DC-link voltage and in the toque produced by the WECS. These...
In this paper, dynamic behavior of a PWM-based vector controlled doubly fed induction generator (DFIG) will be analyzed and improved using an intelligent controller which takes advantage of the emotional decision making process which happens in the mammalian brain, called brain emotional learning-based intelligent controllers (BELBIC) in the literature. In this way, the intelligent controllers are...
A direct single stage single-phase to three-phase conversion has been realized using a cycloinverter (CI) capable of generating high frequency output voltage required by high speed motors, eliminating the requirement of dc link capacitor in two stage conversion. A three phase induction motor drive is run using single phase to thee phase cycloinverter. Space vector PWM controller has been developed...
The design of optimized modulation schemes at low pulse ratios, e.g. Selective Harmonic Elimination (SHE), has been widely studied. However, most previous work has focused on half-wave symmetry pulse patterns. For variable speed and variable torque applications, non-half-wave symmetry SHE modulators depending on the power factor angle still achieve highly efficient inverters in many power factors...
The issue of efficient large force and moment exertion with Unmanned Aerial Vehicles (UAVs) is the subject of this paper. Inspiration is drawn from the vision of UAVs that are capable of autonomously executing industrial activities, or effectively reconfiguring their environment via forceful interaction. Therein, the technical shortcomings of the potential utilization of conventional underactuated...
The requirement to improve power system stability is of utmost importance. Thyristor controlled series compensator (TCSC), which is a series compensating device, can be used to govern the power flow by compensating the reactance of the transmission line. It can also improve the system stability, sub-synchronous resonance mitigation, power oscillation damping and transient stability. Because of its...
Variable speed drives (VSD) constructed with doubly-fed machines (DFM) offer interesting flexibility for power electronic drive design. They also offer opportunities for controlling interactions with an ac grid. Design options are most flexible for the VSD DFM when the machine stator can be operated from an ac or dc source, selected “on-the-fly” as appropriate. This paper presents a SCR-based transfer...
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