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The paper deals with a Second Order Variable Structure Control (VSC) for Wind Turbine PMSG-based and Generator-side Converter System. By means of the proposed control and the associated sliding observer, a vectorial control of PMSG generator is recognized while maximum power point tracking by the renewable source and DC voltage control of the generator-side converter are assured to maintain a high...
A second-order integral flux observer (SOIFO-FLL) with dc component and harmonics attenuation capability is proposed for PMSM sensorless control in this paper. Due to the nonzero integral initial value, parameter mismatch, converter nonlinearities and detection errors, the estimated rotor flux by the conventional methods, pure integrator and low-pass filter (LPF) suffer the dc component and harmonics...
This paper proposes a novel adaptive sliding mode observer to improve the performance of sensorless control of permanent magnet synchronous motor (PMSM) in the More Electric Aircraft (MEA) system. An adaptive sliding mode observer base on adaptively tuning the observer gain is investigated to relax the requirement for the bound of load uncertainties and strengthen the anti-interference ability. System...
Brushless doubly-fed induction generator (BDFIG) is a new type of ac induction machine and can be used for both grid-connected and stand-alone power generation. The conventional control methods for the BDFIG almost all rely on the encoder, which brings many limitations in terms of cost, complexity, reliability, and so on. This paper presents a new rotor speed observer (RSO) for the encoderless operation...
Back-EMF self-sensing is commonly used in induction machine (IM) drive systems. Deadbeat-direct torque and flux control (DB-DTFC) has also shown to be a highly effective method for IM control. At low speeds, accurate machine parameters are important for both DB-DTFC and back-EMF self-sensing performance. In this paper, an injection-based real-time parameter estimation method in IM DB-DTFC drives for...
Permanent magnet synchronous machines (PMSMs) have been used in many applications due to their outstanding advantages such as high torque/power density, high efficiency, light weight and good reliability. However the emerging field of electrical traction gave arise to issues which were in general hardly considered in the past Yet, even though well established methods for eDrive control are available,...
This paper proposes an instantaneous power control method for high speed permanent magnet synchronous generators (PMSG), to realize the decoupled control of active power and reactive power, through vector control based on a sliding mode observer (SMO), and a phase locked loop (PLL). Consequently, the high speed PMSG has a high internal power factor, to ensure efficient operation. Vector control and...
In this paper, the simultaneous trajectory tracking of the speed and the flux state variables of induction machines is realized. Nonlinear feedback control laws are designed to make both the rotor speed and the flux variables reach the desired nominal values in finite time. In this study, the speed, the stator currents, and the flux are assumed to be available for measurement. Numerical simulations...
In order to realize the high dynamic performance of induction motor, a passive speed control scheme of induction motor based on full-order state observer and speed adaptive estimation is proposed for the non-linear nature of the motor. With the analysis of the passive of induction motor and the relationship between passive and stability, a scheme of asymptotic stability torque tracking controller...
Designing a control system for an induction motor (IM) is a generally twofold task: (1) controller synthesis and, (2) assessment of its stability. When using the full fifth order dq-frame model, with incomplete state information and unknown disturbances, the controller design and the proof of stability are not trivial tasks. In this paper, we propose a speed controller for the IM using a reduced-order...
To obtain a good dynamic control performance of permanent magnet synchronous motor (PMSM) drives, four sensors (one position, one DC-link voltage and at least two current sensors) are required for the control-loops. This paper deals with the unpredictable faults that occur in any one of the sensors using an advanced fault-tolerant control (FTC) scheme to provide continuous drive operation. The proposed...
In this paper, a new sensorless control strategy based on sliding mode observer(SMO) and phase-locked loop(PLL) for high speed surface-mounted permanent-magnet synchronous motor(SPMSM) is proposed. Compared to conventional sliding mode observer, the novel observer replaces signum function with sigmoid function as the switching function. This paper presents the results for improved SMO and conventional...
This paper presents a sensorless nonlinear control for an induction motor drive. The strategy is based on backstepping control in order to ensure a high-performance control and a good dynamic in different uncertainties and external disturbance. Moreover, a model reference adaptive system (MRAS) is used for rotor speed and rotor flux estimations; investigate a sensorless control algorithm by decreasing...
This paper presents the modelling and simulation of a low-power Brushless DC machine in a Rotor Flux Oriented mode in MATLAB/Simulink. The modelling of the machine is presented in the synchronous dq frame. Using this model suitable Proportional Integral controllers have been designed for the Rotor Flux Oriented speed and current loops. Sensorless simulation estimates obtained from a back-emf observer...
This paper presents a new method of simultaneous estimation of speed and rotor resistance of an induction motor, from a sensorless vector control system. The simultaneous estimation of the speed, rotor flux and of rotor resistance is done by using an adaptive estimator, called the COS observer. To ensure the persistent excitation condition, in the vector control system, over the rotor flux reference,...
This paper presents an alternative control strategy for 4 degree-of-freedom pose regulation of a quadrotor using the Active Disturbance Rejection approach. The proposed controller was designed using a kind of Lyapunov energy function to ensure asymptotic stability for regulation, in addition to the active disturbance rejection feature which is based in sliding mode extended state observer. This control...
This paper shall present the design, simulation and implementation of a sensorless observer for three-phase permanent magnet synchronous machines which can be used for automotive steer-by-wire applications. The observer tracks steering transients enabling the sensorless speed/position estimates to be used for backup in case of encoder failure. The sensorless method is based on a high frequency injection...
This paper deals with the detection and localization of electrical drives faults, especially those containing induction machines. First, the context of the study is presented and an Extended Kalman Filter is described for induction machines fault detection. Then the modeling procedure under faulty conditions is shown, and the machine diagnosis methods are developed. The proposed diagnosis approach...
In this paper robust nonlinear observer and controller are designed for sensorless control of interior permanent magnet synchronous motor (IPMSM). The proposed method is based on the high order sliding mode technique. The super twisting algorithm is combined with an interconnected observer which allows using it in multi-input multi output case. The proposed controller computed using the MTPA strategy...
The aim of this work is to control a permanent magnetic axial flux machine with non-sinusoidal back-emf, meant for electric vehicles, by applying a passivity based control strategy. Although, the drive is equipped with Hall Effect sensors, the performance of the system is improved by introducing a linear position observer. The control system consist in a nested current loop, designed using Passivity...
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