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This paper proposes a pulsating torque control with a voltage suppression period, which is effective in reducing energy consumption and suitable for position-dependent load torque applications. The proposed control method is based on extracting the fundamental periodic component as a sinusoidal variation by applying a simplified Fourier transformation algorithm. The energy consumption can be reduced...
This paper proposes a flux vector-based discrete-time direct torque control (DTC) scheme for salient-pole permanent-magnet synchronous generators (PMSGs) used in the variable-speed, direct-drive wind energy conversion systems (WECSs). The discrete-time control law is derived from the perspective of flux space vectors and load angle with the torque and stator flux information only. The saliency of...
In this paper, the voltage signal injection at the half of the carrier frequency is proposed for sensorless control in a Three Shunt Sensing Inverter (TSSI). As the injection frequency in sensorless control, high frequency is preferred for a rapid angle estimation and small audible noise. However, the maximum sampling frequency for the current reconstruction is limited to the carrier frequency in...
In this paper, a state-feedback linear-quadratic regulator (LQR) is proposed for event-based control of a linear system. An interesting property of LQRs is that an optimal response of the system can be obtained in accordance to some specifications, like the actuator limits. An integral action is also added in order to not only restrict the study to null stabilization but also to tracking. The idea...
The aim of this paper is to study the use of the Extended Kalman filer (EKF) for sensorless control of a permanent magnet synchronous motor (PMSM) drive controlled by direct torque control (DTC). The main drawback of DTC is the necessity of short sampling period. The challenge for the EKF is therefore the minimization of its execution time. This is achieved by using so called reduced state space model...
In order to detect the initial rotor position of sensorless brushless DC motor in stationary condition, this paper applied the high-frequency signal injection. Utilizing the motor saliency effects, this method worked out the initial rotor position via detecting the different current response of the three phase caused by high-frequency signal injection. This method made up the defect of conventional...
The control system for doubly-fed induction generator (DFIG) operating in stand-alone mode is commonly based on the direct voltage control method, and employs negative-sequence compensation through rotor side converter (RSC) to improve the output voltage quality and support unbalanced loads. This paper demonstrates the limitations of the conventional sensorless direct voltage control method to support...
Among electrical machines with permanent magnets, the class of flux-switching permanent magnet machines has especially good properties with regard to mechanical robustness and cooling. It is a relatively new class of machines with only few industrial applications so far. The design of such machines is thus not well established and known publications on the topic focused on optimizing single objectives...
This paper proposes a novel position/speed estimation method for a special type of armature side excited synchronous machine, namely heteropolar inductor machines, by taking advantage of the machines' unique structural characteristics. The field winding characteristics of heteropolar inductor machines are analyzed firstly. Analytical approaches for developing q-axis position and rotor speed estimation...
Finite control set model predictive control requires a considerable computational burden and it is inevitable to have a time delay between the measurement and the actuation instants in an electric drive based on this control strategy. In this work, it is proposed a new method to compensate the calculation delays in an induction motor drive using predictive control. This new compensation method takes...
Rotor eddy current losses are one of the main reasons of permanent magnet demagnetization in high-speed permanent magnet machines. In this paper the rotor eddy current losses of high-speed permanent magnet machines with different slotless windings have been analysed. The analysis of the losses was performed using 2D and 3D analytical models. In the study, test machines with different windings and...
This paper presents a new self-sensing method for the direct estimation of the slip position angle in the DFIG connected to a dc network. This connection is made by the stator through a diode bridge and by the rotor through a single voltage source inverter. Considerable savings are obtained when this system is used in networks where several systems should work together, because only a dc-link is needed...
In this paper, a sliding mode attitude controller with a two-cascaded loop structure is designed for the attitude control of a quadrotor micro unmanned aircraft vehicle. Considering that the quadrotor systems usually suffer external disturbances in the practical flight, a nonlinear disturbance observer is introduced to improve the robustness of the attitude controller. Extensive simulations show that...
Autogyro or gyroplane as the first rotorcraft and a type of classical V/STOL aerial vehicle has become a hot point in academia and industry. Progresses have been achieved in many research areas such as aerodynamics, structure, flight dynamics, modeling identification. But a sparse contemporary research on autogyro emphasizes the control of autogyro/gyroplane. Our motivation is to design an autopilot...
This paper presents aerodynamic analysis of an unmanned small-scaled gyroplane with a rotor having cyclic pitch system. A comprehensive nonlinear model is derived for it which involves force and moment generation mechanism for the flying vehicle. The nonlinear model is linearized with approximations and deduced on a prescribed flight condition. Our gyroplane dynamic modal response is further reconfigured...
This paper establishes the prediction model of low cycle fatigue damage of steam turbine rotor using the rich data from finite element analysis. In order to monitor the damage, a multiple regression analysis of input data/output data with high correlation is made via dynamic PLS. The variation of the process parameters is extracted and it restrains the multiple dependency of the several parameters...
To obtain the constant torque of brushless DC (BLDC) motor with ideal trapezoid back EMF, rectangular phase-current is required. However, due to the tolerance in manufacturing and inevitable trade-off in motor designs, the back EMF of BLDC motor is not ideal in general, thus the torque ripple occurs if phase-current maintains rectangular waveform. To suppress the torque ripple of the BLDC motor with...
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...
Many attempts have been made on fault diagnosis of induction motors based on frequency and time domain analysis of stator current. In this paper, first the Park's vector transformation and frequency analysis for fault detection of induction motors are introduced. Then a smart approach using Adaptive Neuro Fuzzy Inference System (ANFIS) is proposed. This approach uses the time domain features derived...
Fast response of doubly fed induction generators is very important for grid synchronization where they are used for electrical energy generation in wind units with variable speed turbine. Predictive rotor control method is proposed in this paper. The cost function based predictive control is used to control the torque and flux of the rotor. A novel torque ripple reduction method is proposed. Therefore,...
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