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A robust nonlinear adaptive controller design for unmanned autonomous vehicles (UAVs) for controlling the hovering flight is presented. The controller is premeditated recursively based on the control Lyapunov theory where the mass of the UAV in the model is considered as anonymous parameter. To illustrate the forcefulness property of the designed controller, the effects of external disturbances are...
This paper presents a nonlinear control scheme to control the attitude of a small-scale rotary wing unmanned aerial vehicle (RUAV) in the presence of external disturbances. The proposed attitude controller is designed in such a way that it is robust to external disturbances. To prove the convergence of the attitude tacking error to zero, i.e., the actual attitude of the closed-loop system to reference...
This paper presents the performance study of a speed sensor-less control of grid connected DFIG based variable speed Wind Energy Conversion System (WECS). A new phase locked loop (PLL) based slip speed estimator using rotor current is proposed for speed sensor-less stator field oriented vector control operation of rotor side converter (RSC) to ensure decoupled control of stator active and reactive...
This paper analyzes the steady state performance of isolated 3-phase self excited induction generator (SEIG) feeding balanced static resistive load. The effects of load and capacitance on magnetizing reactance, frequency, terminal voltage, currents have been shown in this paper. The model equations, which are nonlinear in nature, have been developed using graph theory. These equations can be easily...
This paper presents performance evaluation of an improved low cost single phase self excited induction generator (SEIG) using a three phase machine. This machine can be used in grid isolated and remote areas as a portable source of power supply. The reactive power requirement for this type of generator is provided through a single capacitor of suitable value and a single phase inverter with a photovoltaic...
The problem of stabilization of lateral and longitudinal position for hover flight mode of an unmanned autonomous helicopter (UAH) in a gusty environment is considered. The controller design is based on generic linear model which successfully describes the behavior of most small scale helicopters. A recursive (backstepping) design procedure is used to design the robust controller for longitudinal...
A position sensorless Surface Permanent Magnet Synchronous Motor (SPMSM) drive based on flux angle is presented in this paper. The motor equations are written in rotor fixed d-q reference frame. A PID controller is used to process the speed error to generate the reference torque current keeping the magnetizing current fixed. The estimated stator flux using Recurrent Neural Network (RNN) is used to...
Wound-rotor induction motor drive fed from inverters on both the stator and rotor side is discussed. The sensorless control scheme for the motor requires a V/f-type direct frequency control preferably on the rotor side, with either vector control or direct torque control on the stator side. Selection of any frequency for the rotor side inverter keeping the rotor flux constant is possible. This rotor...
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