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In this paper, a magnetizing characteristic identification method for an induction machine at standstill is proposed. The technique is based on machine testing with a single-phase ac supply generated through a standard inverter. This type of test strategy is available in the literature, however, it has been used for parameter identification at a single current level thus ignoring the effects of magnetic...
This paper targets to the challenge of electrical energy production and energy efficiency by studying synchronous reluctance machines (SynRM), as an alternative to permanent magnet generator in electric power generation with focus in renewable energy applications. Considering the SynRM as a special case of the wound-rotor synchronous generator, this paper explores the operating limits of the machine...
This paper analyses the detuning effects of machine electrical parameters on the performance of unified direct flux vector control (UDFVC) of induction motor drives. Drive self-commissioning is discussed as a way to estimate parameters for better control performance and accurate torque estimation. The potential of the unification of direct flux and current vector control has been recognized for both...
Compliancy to grid codes has been a driving force behind the development of variable-speed technologies for wind generation. This resulted in the doubly-fed induction generator (DFIG) to become a common technology. The operational benefits of the DFIG derive from the possibility of controlling the operating speed of the generator from the rotor windings. Even if constructively different, the Dual-Excited...
To ensure safe and reliable operation of power system based on wind energy, usually plant operators should satisfy grid code requirements such as grid stability, fault ride through (FRT), power quality improvement, grid synchronization and power control etc. To satisfy the grid code requirements of wind turbine, usually grid side converter is playing a major role. So in order to improve the operation...
This paper presents implementation of Feedback Linearization based control (FBLC) for the smooth connection of the doubly fed induction generator to the power grid and for the power control of the grid connected doubly fed induction generator. The induced stator voltage vector of the DFIG is synchronized with the grid voltage irrespective of the accuracy of signal from position encoder. Computer simulation...
This paper presents the findings of investigation of decoupled power control of grid-connected doubly fed induction generator (DFIG) based on Adaptive Back Stepping Control (ABSC) technique. The Adaptive Back Stepping control technique offers a systematic stabilizing procedure wherein unwanted cancellation of favourable nonlinearities can be avoided. Incorporation of the proposed controller improves...
High availability is a major concern in naval drive applications. In consequence, multiphase machines, e.g. IM with double-star stator windings, are used. To guarantee the high availability, comprehensive scenario-based analyses of the machine-control behaviour in case of faults have to be performed. Asymmetrical faults - which are a practical issue - are not featured by any simplified single-phase...
The multi-degree-of-freedom spherical driving joint with direct bearing driven by spherical motor owns high mechanical integrity and has many advantages such as control and trajectory planning. This paper presents a novel multi-degree-of-freedom spherical reluctance driving joint with magnetic levitation, and analyses operation mechanism, and next deduces the joint's magnetic conduction of the gap...
In this paper, the coupling magnetic field model which the power magnetic bearing generated by interference between the rotation and levitation force is linear inverse system decoupling, and study PID control strategy on decoupling linearization system. According to the performance analysis and simulation of PID control system, it can be concluded that PID control system has quick response, high control...
With increasing performance of magnet material and decreasing cost permanent magnet synchronous machines (PMSM) become more and more important for practical use in naval applications. Excellent torque dynamics are important in these applications - they allow meeting additional demands due to electrical system stability. Dynamics are limited by the rating and the switching frequency of the converter...
This paper presents a new scheme for induction motor control. First the feedback sliding mode linearization control is applied to induction motor in order to separate the control of the rotor speed and flux square. Once the two physical outputs reach their reference, the machine control is performed by an H∞ controller. We detail, in this paper, how to design the H∞ controller to guarantee the robust...
High speed maglev maintenance vehicle (MMV) is propelled by multiple in-wheel-induction-motors drive system (IWIM). This paper analyses the characteristics of multiple IWIM drive system for MMV. An electromechanical simulation platform is developed in our Lab. Adaptive flux observer is applied to provide speed sensor-less vector control for multiple IWIM drive system. The influences of different wheel...
This paper proposes a dual current-slope rotor position estimation and its relative sensorless closed-loop drive system for synchronous reluctance motors. First, the mathematical model of the synchronous reluctance motor is discussed. Then, a new rotor position/speed estimator of the synchronous reluctance motor is proposed. The proposed method uses dual current-slope to estimate the rotor position...
A new gain-scheduling sliding mode controller for permanent magnet synchronous motor (PMSM) was designed to achieve position tracing control and robust control. The sliding mode position controller is designed to ensure the tracing and robust performance of the PMSM servo system firstly, and then the gain-scheduling based on fuzzy logic theory is adopted to reduce chattering of sliding mode controller...
This paper implement an online training of dynamic neural networks (NNs) for identification and control of permanent magnet synchronous motor (PMSM) servo system. Utilizing two multilayer feed-forward NNs, it makes no such assumptions. The two networks work in tandem to simultaneously achieve system identification and adaptive control. The proposed control system is designed and its effectiveness...
This paper presents a unified control method for the combined permanent magnet generator (PMG) and three-phase boost rectifier that can be used in autonomous power systems such as more-electric aircraft requiring high power density. With the unified control, the paper shows the system can function well without additional boost inductors. The design procedure for the control is presented, including...
This paper introduces a new solution for Doubly-Fed Induction Generators (DFIG) to stay connected to the grid during short circuit condition. The main idea is to increase the stator voltage to a level that creates the required flux to keep the rotor side converter current below its transient rating. To accomplish this goal, a series compensator is added to inject voltage, during the short circuit,...
This paper studied mathematical model of doubly-fed induction generator (DFIG) based wind turbine generation system under unbalanced voltage. A dual-PI current control strategy was proposed to improve the performance of DFIG's rotor side convert (RSC) under asymmetrical voltage condition. The symmetrical component theory is employed to decompose asymmetrical three-phase variable such as voltage and...
This paper presents an elegant technique for mitigating the output power fluctuations from a grid connected Opti-slip induction generator (OSIG), due to sudden wind gusts leading to input drive torque variations. The proposed technique has also been extended to control the amount of real power into the grid at the desired value. The control of OSIG is achieved using the basic principles of chopper...
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