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Stator inter-turn short circuit fault is one of the common faults in Double Fed Induction Generator (DFIG), the mathematical model of the DFIG is established based on the multi — loop theory, and the model of DFIG is built on the MATLAB / Simulink platform under normal condition and different degrees of inter — turn short circuit. The mathematical model of the grid side converter is analyzed to determine...
With the advance of power electronic technology, direct driven permanent magnet synchronous generators (PMSG) have increasingly drawn interests to wind turbine manufactures. This paper mainly introduces the basic principle and several traditional control strategies of PMSG. Furthermore, the PMSG model is developed completely based on detail mathematical formulas. In this study, the three-phase electrical...
Aim at the existing problems of the Extended Kalman Filter (EKF) in speed sensorless control system of permanent magnet synchronous motor (PMSM), such as too much computation, complex structure and high cost. A kind of Reduced-order Extended Kalman Filter (Reduced-order EKF) in speed sensorless control system of PMSM is proposed in this paper. By estimating the counter electromotive force according...
This paper presents a quantitative analysis of the advantages of a grid connected doubly fed induction generator (DFIG) for wind energy conversion systems (WECS) over the other available variable speed WECS. The WEC system includes back-to-back connected PWM voltage source converters (VSC) in the rotor circuit of the DFIG. The control strategy implemented is - unity power factor operation of the machine...
A new control strategy of induction motors with stator flux orientation (SFOC) that combines the advantages of both Vector Control and Direct Torque Control is presented. According to the dynamic model of induction motors, stator flux is controlled effectively. Based on the fuzzy logic control theory,the stator resistance estimator is designed to identify stator resistance and on-line compensate....
In this paper, we investigate the position control of spherical ultrasonic motor (SUSM). The generated torque of SUSM is influenced by the phase difference and the driving frequency of applied AC voltages. Therefore, the control strategy is classified into three types: (a) variable phase and fixed frequency, (b) fixed phase and variable frequency, and (c) variable phase and frequency. We formulate...
A new control strategy of induction motors with stator flux orientation is presented. According to the dynamic model of induction motors, stator flux is controlled effectively but affected by stator resistance. Based on the fuzzy logic control theory,the stator resistance estimator is designed to realize stator resistance on-line tuning. The Simulation confirmed the feasibility of the method.
The paper deals with a new scalar control algorithm for industrial IPMSM drives able to perform an effective energy saving strategy. According to the motor operating point and using a polynomial relationship between torque angle and stator current phase, such a control exploits the conditions of Maximum Torque per Ampere (MTPA), Flux Weakening (FW) or Maximum Torque per Voltage (MTPV). The paper provides...
This paper presents an enhanced direct power control (DPC) algorithm for doubly fed induction generators (DFIG) capable of reducing the common mode voltage (CMV). Nowadays the DFIG is often used in high power wind energy conversion systems (WECS). A common problem of converter fed induction machines are the bearing damages due to the bearing currents. The source of this problem is the common mode...
For fluctuations of the DC bus voltage in dual PWM motor drive system, which is caused by the frequent changes in motor running, the generation mechanism is analyzed. A new control strategy for dual PWM system is proposed, which is based on EL model and the load power feed forward. By using DC steady state voltage compensation and the Power load forecasting, the stable DC voltage and the unity power...
Using three-phase permanent magnet AC motor (PM motor) as drive part of electric vehicle (EV), the motor must achieve zero speed braking when the vehicle brakes to stop on the slope. Braking force and motor rotation have the same direction when the vehicle is braking in the downhill; and the direction are opposite when braking in the uphill. Therefore, the general control strategy for PM motor cannot...
A bearingless switched-reluctance motor (BSRM) has a complicated nonlinear character; therefore, its control strategy is very important to a stable operation. This paper presents a new control strategy for rotating and levitating a 12/8 BSRM with two sets of windings. This strategy can enhance not only the availability of winding currents in producing the radial force to suspend a rotor, but also...
Vibration and acoustic noise are the important reasons for switched reluctance motor to be unacceptable in variable speed drive market. To optimize the physical structure of the motor and to choose the appropriate control strategies are the two conventional ways to reduce the noise. In this paper, a new method is proposed to combine these two optimization ways together: harmony optimization of switched...
The purpose of this research is to optimize control and enhance performance for a variable speed constant frequency (VSCF) doubly-fed induction generator (DFIG) wind turbine generation system by using fuzzy logic controller. The control of the rotor-side converter is realized by stator flux oriented control and the fuzzy controller performs robust speed control. The control of the grid-side converter...
This paper presents an approach to utilize a passive impedance network in series at the stator side of a typical DFIG wind turbine for the purpose of voltage sag ride through. A control strategy that enables the passive impedance network to engage and stabilize the stator flux during grid voltage sag events has been studied. Simulation results demonstrates that electromagnetic torque and rotor current...
This contribution introduces proposed control of a wheel drive with permanent magnet synchronous machine (PMSM) intended for a new generation of 100-percent low-floor trams. The proposed control is based on a field oriented control linked to a rotor flux. The control strategy consists of two control algorithms which are changed based on the rotor speed. The proposed control fully satisfies demanded...
The rapid penetration of a large number of distributed generations poses new challenges for the safe and effective operation of the main grid. A better way to realize the emerging potential of distributed generation is to take a system approach which views generation and associated loads as a subsystem or a ldquomicro-gridrdquo. The DFIG with storage system is the main micro-source in this paper....
The vector control technique is applied in doubly fed induction generator (DFIG) according to the characteristic of AC-excited variable speed constant frequency (VSCF) wind power generation, a comprehensive control strategy is presented based on grid voltage orientation, which gets the same performances as stator flux orientation, but the stator flux observer can be omitted to simplify the control...
The integrated starter generator (ISG) technique has been widely used in the past in hybrid electric vehicle (HEV) drive trains. Instead of 2 independent electric machines, as in conventional vehicles, the ISG functions both as a starting engine as well as a generator, which facilitates the generation of on-board electric power. In this paper, the usage of the ISG in various advanced HEV topologies,...
The intention of the present paper is to draw a reasonable comparison of two different types of electrical machines for use in a parallel hybrid drive train: the induction machine with cage rotor on the one hand, the permanent magnet synchronous machine on the other hand. Both machine types have been designed for application in a mild hybrid vehicle. By dint of simulation models and a total vehicle...
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