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This paper addresses design issues on a position sensorless drive for permanent magnet (PM) synchronous machines in the entire speed range. At initial state, the rotor magnetic polarity is identified based on the flux saturation through a square-wave voltage injection. For low speed operation, the spatial information in the saliency is tracked for the closed-loop sensorless drive. The square-wave...
A typical challenge for electric drivetrains is to reduce the number of sensors required for control action or system monitoring. This is particularly important for electric motors operating in offshore conditions, since they work in hostile environment which often damages data acquisition systems. Therefore, this paper deals with verification and validation of the extended Kalman filter (EKF) for...
This paper proposes a new flux estimation for permanent magnet synchronous motor sensorless control using all-path filters and band-pass filters as quasi-integrators, which can enhance the flux linkage estimation performance using all-path filters and low-path filters that the authors have already proposed. This paper also presents extremely precise rotor position estimation performances in the low-speed...
This paper proposes a sensorless control method for Wound-Rotor Synchronous Starter/Generator (WSSG) in starting process. It is necessary to identify the initial rotor position when uses sensorless control method to start-up AC machines. However, during the process of initial orientation the excitation current of the main generator contains severe pulsating components, which leads to the ineffectiveness...
This paper presents a novel sensor-less SRM drive based on adaptive-fuzzy logic control. In this method, SRM drive is model-based and current error between actual current and model current is from the proposed speed estimation. Speed estimation has been calculated in two stages; in first stage, current error is used for the compensation of SRM current and next stage obtains compensated torque using...
This paper proposes a new sensorless method for the vector control of grid-connected doubly-fed induction machine (DFIM) drive. The proposed sensorless method is based on the model reference adaptive controller (MRAC) which utilize instantaneous and steady state values respectively of a fictitious quantity obtained as the difference between two fictitious ratios of rotor voltage to current along the...
In the recent past, the use of permanent magnet synchronous motors (PMSM) has increased due to the numerous advantages they offer. The accurate performance and precise speed and/or position control of a PMS motor requires precise information about the rotor shaft position and angular speed in order to synchronize the phase excitation pulses to the rotor position. In order to achieve the speed control...
This paper presents, a rotor speed and stator resistance estimation under very low speed operating region using parallel rotor speed and stator resistance estimation scheme. This scheme is an extension of rotor flux based model reference adaptive system (MRAS) scheme. In this scheme the rotor speed and parameter variation is estimated using MRAS technique. The estimated speed is incorporated as a...
This paper aims to present a sensorless indirect field oriented control (IFOC) associated with an intelligent technique based on fuzzy logic controllers (FLC) in purpose to guarantee fast response and to improve the dynamic performance of a three-phase squirrel cage induction motor drive (SCIM). These regulators are used instead of the classical IP ones and are applied in speed and stator currents...
A new rotor position estimation method based on stator electromotive force (EMF) vector has been presented in this paper. The accurate rotor position is crucial information in the context of decoupled power control of doubly fed induction generator (DFIG) during its standalone as well as grid integrated mode of operation. The proposed rotor position estimation method uses the measured stator and rotor...
As a main limitation in the state and parameters estimation using Extended Kalman Filter (EKF) is that its optimality is critically dependent on the choice of the right covariance matrices of state and measurement noise. In order to overcome this difficulty, a new approach based on the use of the tuned EKF to estimate simultaneously the speed and rotor flux of an induction motor drive is proposed...
In this paper, sensorless speed control of permanent magnet synchronous motor (PMSM) with an Extended Kalman Filter (EKF) based observer is performed. The general model of the PMSM and EKF algorithm are presented. Simulation studies are carried out using MATLAB/Simulink, in order to explore effectiveness and usability of EKF in sensorless PMSM drive for washing machine applications. In order to investigate...
In this paper, the work has been developed aiming at reduction of inverter non-linear influences on high frequency carrier voltage injection sensorless control algorithm. For this method, inverter non-linear errors introduce distortions of the motor stator voltage that degrade the estimation performance. The main cause is the deviation of the high frequency voltage vector angle used for the demodulation...
This paper proposes a novel initial rotor position estimation algorithm for Interior Permanent Magnet Synchronous Machine (IPMSM) drives. First, the rotor position is determined based on the machine saliency using the flux equations in the stationary reference frame. Since the machine saliency performs two periods in one electrical cycle, there exists an ambiguity of 180° in the estimation result...
Multiphase variable-speed drives' advantages such as fault tolerance and better power-per-phase splitting make these electromagnetic devices suitable for high reliability applications. However, the applied control techniques require accurate knowledge of the electrical parameters of the machine. Although a large number of modulation and control strategies have been proposed, little work has been focused...
In this paper, kinodynamic motion planning is described for keeping the attitude of a quadrotor and converging to an arbitrary target point, while avoiding obstacles. Kinodynamic motion planning was extended for a quadrotor in our previous research, but its behavior was confirmed only in simulations. Therefore, we implement the proposed kinodynamic motion planning to an actual quadrotor, and confirm...
Surface-mounted permanent magnet synchronous machine with concentrated windings (cwSPMSM) is widely adopted in many industry applications. However, strong multiple saliencies is a main drawback impeding applying sensorless control over this type of machine. This work proposes a hybrid sensorless control scheme which integrates a novel Secondary Saliency Tracking (SST) algorithm and an improved Active...
Wind power plant is source of harmonics and inter-harmonics. Estimation of these harmonics is very important and crucial task in modern distribution generation environment. This paper presents sliding window matrix pencil algorithm to estimate harmonics and inter harmonics produced by doubly fed induction generator based wind power plant. The series of simulation results under variable wind speed...
This paper presents a speed estimation scheme using Rotor flux based Model Reference Adaptive System (MRAS). This estimated speed is incorporated as a feedback to the Direct Torque and Flux Control (DTFC) of Induction Motor Drive (IMD). In this scheme the rotor flux linkage components of the Induction Motor (IM) are obtained from the Reference Model (RM) and Adaptive Model (AM) respectively. The difference...
This paper evaluates the influence of unbalance supply voltage in calculating the various normalized performance parameters of three phase induction motor (3-ϕ IM). Firstly, the ratio of the various performance parameters of 3-ϕ IM, viz., stator copper loss, rotor copper loss, efficiency, output power, and output torques, under the condition of unbalance and balance supply voltage are calculated....
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