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This paper investigates the performance limits of pulsating carrier signal injection method in detecting the initial rotor position of permanent magnet synchronous motors (PMSMs). To eliminate the influence of motor parameter variations and signal delays, a novel signal extraction algorithm by simultaneously demodulating the two orthogonal response currents in the estimated rotor frame is proposed...
A nonlinear control algorithm is given for a class of quadrotors operating in small angles. The control of 6-DOF moving platform using only four actuators results in an under-actuated control system. In order to transform the dynamics in affine form, an additional constraint is applied on the actuation mechanism that reduces the independent control signals even further. In this paper, the system is...
This article presents two variants of the extended Kalman filter (EKF), applied to the fault detection and isolation (FDI) of the inter-turn short circuits in stator windings of the induction motor (IM). Besides the state variables, these two variants allow estimating some parameters, named fault factors. They are three fault factors, i.e., one by phase, which are to be estimated. The first EKF variant...
This paper describes a control mode transition method between Speed Closed Loop control modes based on Voltage Vector Control (VVC-SCL) and torque control mode based on Torque Control with Speed Feedback (TCSF), which was proposed for applying in medium dynamic applications. In order to describe conveniently, the principle of VVC-SCL and TCSF are introduced in brief first. The relationship between...
The operation of variable speed ac drives with loss-minimizing flux strategies can produce important energy savings. This paper proposes algorithms for the evaluation of loss power components, and the flux level that produces minimum loss operating condition, covering the whole constant torque operating region. Both scalar and vector drives are considered, although it is found that the operation of...
The paper presents the sensorless control of induction machine based on multi-scalar variables in which the rotor angular speed is estimated by the novel structure of the speed observer. The novel speed observer structure is constructed by using the backstepping approach. This observer structure is named Z-type observer backstepping. A comparison between the standard adaptive backstepping and the...
This paper describes a design of a wind turbine pitch controller based on the disturbance accommodating control (DAC) theory. Wind turbine systems generally operate under stochastic environments, such as random wind inputs and noise corrupted sensor signals. Especially wind inputs can be treated as persistent disturbances and DAC can play a role in reducing effects of wind disturbances. By doing this,...
Much of the work in the area of attitude synchronization of multiple satellites is focused on satellites with external actuators. In this paper we focus on satellites that are actuated by internal actuation mechanisms, like momentum wheels or rotors. The distinguishing aspect of the internal actuation case is that the dynamics are described on a level set of the angular momentum map. We propose a...
The paper discusses the problem of flux estimation for the induction motor (IM) drive and presents a sensorless observer. The objective is to estimate the fluxes of the IM in the stationary reference frame and to obtain the magnitude and the angle of the rotor flux. In a typical sensorless IM scheme, both these estimates are needed. The paper first presents an alternative state-space model of the...
A new hybrid position sensorless control method for reluctance synchronous machine drives is presented in this paper. The active-flux and arbitrary injection position estimation techniques are combined for the first time in this hybrid controller. The controller switches between estimation techniques depending on speed and load. A hysteresis region is implemented with phase-locked loop synchronisation...
A comparison between two-phase-on (2PO) and three-phase-on operation (3PO) for Three-phase Brushless DC machines (BLDCs) is presented in this paper. It aims to highlight the different BLDC exploitation achievable by means of 3PO compared to that obtainable by 2PO. For this purpose, two different control strategies are considered, i.e. a traditional 2PO-based and a 3PO-based, whose main details are...
We study a class of optimal control problems that are encountered in consensus and synchronization networks. These are characterized by structural constraints that arise from the lack of the absolute measurements for a part of the state vector. In order to deal with these constraints, we introduce a coordinate transformation to eliminate the average mode and assure stabilizability and detectability...
With increasing demand for energy, there is a growing tendency to employ renewable sources such as wind energy. Using large amounts of energy from wind arouses critical issues such as voltage variation and poor quality power supply. Several papers have been published on suggestions to improve performance of wind turbines during grid fault; however, to the authors' knowledge only a few papers address...
In the paper, a model predictive controller (MPC) for the position control for an induction motor drive with an elastic connection is presented. The control methodology enables the drive's safety and physical limitations to be directly incorporated into control synthesis. The effect of the predictive horizon on the drive performance is examined. The theoretical consideration are supported by experimental...
The paper presents closed-loop ac drive with 5-phase induction motor operating with voltage source inverter and sine-wave filter. The motor supply voltages and currents have sinusoidal shape. For well known adjustable electric drives the field oriented control method with flux and speed control can be applied. In the presence of output filter both control and estimation algorithms should be modified...
A novel Subspace Predictive Repetitive Control (SPRC) methodology is presented and used to control trailing edge flaps for wind turbines. First, the dynamics of the wind turbine are identified online. This is especially important for trailing edge flaps on a large wind turbine, where a local change in wind conditions can result in significantly altered aerodynamics. Next, a repetitive control (RC)...
This paper deals with field-oriented control (FOC) and vector control (VC) of a promising brushless doubly-fed reluctance generator (BDFRG) technology for large-scale wind turbines. The BDFRG has been receiving increasing attention because of the low operation & maintenance costs afforded by the use of partially-rated power electronics, and the high reliability of brushless construction, while...
In this paper a nonlinear attitude tracking control scheme is developed for a small-scaled unmanned helicopter under input constraints. Via the analysis of the properties associated with the helicopter's rotor dynamics, the elevator servo input, the aileron servo input, and the rudder servo input are chosen to be the control inputs to be designed. Their constraints in amplitude under hovering flight...
Based on the inner-outer loop structure, a robust H∞ flight controller is designed for small-scale unmanned helicopters. Under the hovering flight condition, the small-scale unmanned helicopter dynamic model is linearized. External disturbances, nonlinear uncertainties, and parameter uncertainties are considered as an equivalent disturbance. The velocity and the yaw angular rate are controlled by...
This paper proposes a Hybrid optimization, which combines intelligent genetic algorithm and nonlinear least squares method. The Hybrid optimization can achieve the optimal tuning value of ADRC controller. Under the control structure of Maximum Power Point Tracking(MPPT)strategy and Active Disturbances Rejection Control (ADRC), the ADRC controller which is tuned by the Hybrid optimization can find...
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