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Model predictive control (MPC) relies heavily on the accurate mathematical model which is usually difficult to be obtained. Parameters of permanent magnet synchronous motor (PMSM) would be changed in real time and influenced by uncertain factors. For this purpose, this paper proposes a multiparameter identification strategy for PMSM based on MPC. The simulation is carried out and its results show...
To trace maximum power points (MPP) d-axis and q-axis stator currents are required to be controlled individually, and decoupled for grid voltage support and reactive power injection during the grid faults. A decoupling method for Doubly Fed Induction Generator (DFIG) tied with grid is presented by Exact Feedback Linearization (EFL) based on differential geometry. State feedback linearization conditions...
In this paper, a controller design method is proposed for stand-alone doubly fed induction generator (DFIG). This method is based on forced stator-voltage-oriented vector control principle and active disturbance rejection control (ADRC) approach. Specifically, the forced stator-voltage-oriented vector control principle is used to simplify the mathematics model of stand-alone DFIG and guarantee constant...
The paper proposes a new method of chattering reduction based on Second Order Sliding Mode (SOSM), which is applied in sensorless control of Permanent Magnet Synchronous Machine (PMSM). In this implementation the PMSM model and proposed SOSM observer are both expressed in the γδ estimated reference frame. An augmented state observer uses the provided equivalent control input to bypass the high frequency...
Variation of rotor resistance in conventional PI-based vector controlled wind driven systems degrades the performance. This paper presents a novel adaptive power control method for the doubly fed induction generator (DFIG) based on the brain emotional learning-based intelligent controller (BELBIC), in which one set of conventional PI controllers are replaced with the soft BELBIC controllers. To obtain...
This paper describes problems of the sensorless starting of horizontal axis washing machines with direct drive and proposes solution, which was experimentally verified. H-axis washing machines have very difficult conditions for the drive starting, especially at full load. Inertia of the tub and water, torque from the laundry make load torque at starting higher than rated one and sometimes even higher...
Due to its great potential value in theory and application, nonlinear control strategies of synchronous motors (SM), especially passivity-based control (PBC) methods, have been a focus in the literature. A PBC strategy for SM with time-varying load torque to track flux and speed trajectories is proposed in this paper. The key point of this method is the identification of terms, known as workless forces,...
In order to avoid the influence of speed sensor and the parameter change as a result of the temperature variety on the system performance, a sensor-less vector control system based on model reference adaptive system (MRAS) for asynchronous motor is described in this paper. The rotor speed and magnetic flux are identified online with full order adaptive observers correctly and rapidly. The simulation...
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.
Nonlinear control strategies of variable speed constant frequency(VSCF) wind power generator systems, especially passivity-based control(PBC) methods, have been a focus in the literature. The main purpose of this paper is to develop a control algorithm that forces the wind driven doubly fed induction generator(DFIG) to track reference flux and speed trajectories with time-varying load torque. To achieve...
Three methods for the induction motor (IM) applying the interconnection and damping assignment passivity based control (IDA-PBC) have been summarized and compared with each other. After comparison, the IM system controlled by the third IDA-PBC method containing a load torque observer based on adaptation mechanism presents a better performance in accurately tracking the variable rotor speed and being...
This paper investigates the impact of the control system bandwidth on the detection of incipient faults in doubly fed induction generators used in wind turbines. In this application, the rotor is supplied by a static converter for the control of active and reactive power flows from the generator to the electrical grid. The Impact of the closed loop control system cannot be neglected when the detection...
A novel V/F induction motor control system based on stator voltage oriented method is presented. This scheme includes dead time compensation, stator voltage compensation and anti-oscillation regulation, which can greatly improve the V/F systempsilas performance especially low frequency load capability and fast response capability. Different from conventional V/F methods, all the compensation and regulation...
Induction motors have some inherent characteristics such as multivariate, parameter indeterminacy, strong coupling and non-linearity. These bring about a lot of trouble to the induction motor drive system. Considering the problems of AC speed regulation cause by the motor's inherent characteristics, a fuzzy control strategy based on the RBF neural network was presented. It was designed to make full...
Variation of winding resistance, magnetic saturation and iron loss in the induction motor result in field angle estimation error, which causes detuning problems. Especially, in cases when the iron loss and change of inductance cannot be neglected, ordinary resistance identification methods may lead to incorrect results. To solve this problem, a new method to directly revise the observed field position...
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