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Brushless Doubly-Fed Machine (BDFM) is a machine which incorporates the robustness of the squirrel cage induction machine while having the speed and power factor control of a synchronous machine. A special kind of rotor called Nested-Loop rotor plays an important part in the BDFM, coupling the two stator fields. In future BDFM will share a large part in wind power market. This paper presents a mathematical...
A simple and intuitive Doubly Fed Induction Generator (DFIG) predictive rotor current control scheme is presented. Predictive control of an Indirect Matrix Converter (IMC) is combined with predictive rotor current control of a DFIG to achieve a very good dynamic response as the rotor currents smoothly follow the applied reference in a ±30% range of the generator nominal rpm. Simulation results are...
Interior permanent magnet machines are gaining more importance due to their advantages of cost optimized fabrication and the ability to use the reluctancy torque. A drawback of the interior permanent magnet machine is the more complex control structure than for synchronous machines having the magnets on the rotor surface. Therefore an optimized control structure has been developed and simulated to...
This paper propose a new current control system for IPMSM to reduce harmonic currents caused by the overmoduration and a non-sinusoidal magnetic flux distribution on the rotor. The harmonic currents have problems with making a current control system of IPMSMs unstable easily. The proposed current control system has two current controllers. One of them controls fundamental current to satisfy the required...
For doubly fed induction machines operating as wind generators (DFIG), the terminal voltage and the active power delivered to the grid are controlled by a PWM converter linked to the machine rotor. The monitoring of the direct and quadrature axis components of the rotor voltage makes possible the control of the terminal voltage and active power, respectively. Currently, this control is performed by...
Hybrid-excited flux-switching (HEFS) machine is a relatively novel brushless machine having magnets, armature windings and field windings in the stator, as well as a simple and robust rotor. In this paper, the control strategies for the proper injection of field currents are proposed and implemented by a simulated model based on Matlab/Simulink. The predicted performance confirms the excellent flux-regulation...
The hybrid recurrent fuzzy neural network (HRFNN) control permanent magnet synchronous motor (PMSM) drive system using rotor flux estimator is developed to control electric motorcycle in this paper. First, the dynamic models of a PMSM drive system and electric motorcycle are builted though experimental tests and parameters measurements. Then, a HRFNN control system using rotor flux estimator is developed...
This paper presents the direct model reference adaptive internal model controller for doubly fed induction generator used in wind farms based on MIT rule adjustment mechanism in addition to Perrin equation adjustment mechanisms with improved internal model controller filter design. Direct model reference adaptive internal model controller is developed and it is tuned using MIT rule adjustment mechanism...
This paper presents employment of adaptive deadbeat current controllers in vector control scheme working in rotor flux coordinates. The parameter changes cause the deterioration of control performance in high precision AC induction motor drives. The adaptive controllers with online identification keep the performance on a high level. On-line identification gives the estimate of the motor parameters...
BLDC motors have been gaining attention from various industrial and household appliance manufacturers, because of its high efficiency, high power density and low maintenance cost. After many research and developments in the fields of magnetic materials and power electronics, their applications to electric drives have increased to a significant extent. In this paper, the modeling of Brushless DC motor...
The paper deals with the problem of speed and position estimation in SRM drive equipped with hysteresis band current controller. Instead of measured current the observer utilize reference current. The voltage is calculated from switching on-time. A speed observer structure which uses estimated back EMF and current of each phase is presented. The shaft position is integrated from estimated speed signal.
The sensorless control of PMSM are mostly based on high frequency voltage signal injection method or state-observer. A novel rotor position self-sensing method was put forward in this paper by combing the fluctuating high frequency voltage signal injection (FHFVS) method and model reference adaptive system (MRAS) method, which was used in maximum ratio of torque to current control system. The speed-switcher...
The doubly-fed induction generator (DFIG) is normally controlled with stator-flux orientation. Stator-voltage orientation can also be adopted. It is a poorly damped system with a natural frequency near the grid frequency. This leads to natural oscillations on the flux and torque and, for stator-flux orientation, in some cases, to instability. An unstable region is verified when fast rotor current...
This paper focuses on the development of maximum wind power extraction strategies for variable speed constant frequency (VSCF) grid-connected wind power generation systems with a doubly fed induction generator (DFIG). A new control method is proposed by directly controlling the DFIG rotor current to follow an optimal condition for not only the extracted maximum power of the wind turbine below the...
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