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This paper explains a new approach to avoid or to pass through singular states in a Control Moment Gyroscope (CMG) with pyramidal shape. It is well known that a CMG cannot produce torque in the singular direction when it enters in a singular state; therefore, the only option to cross the singularity state is to allow differences between the required and the real torque. The proposed scheme developed...
Hybrid Electrical Vehicles (HEV) are a very promising approach to save fuel and minimize exhaust emissions. The drivetrains of HEV are equipped with at least one Electric Machine (EM) in addition to the Internal Combustion Engine (ICE). Therefore it is possible to operate the Internal Combustion Engine (ICE) in more efficient working points or to shut it down if the efficiency is too low. Despite...
This work presents an adaptive nonlinear ℋ∞ control strategy for variable-speed wind turbines intended to maximize turbine power extraction. The control structure is shown to robustly reject disturbances acting on the system, particularly those introduced by time-varying wind profiles. Remarkably, the controller does not make use of externally sensed wind speed measures, but are obtained from a properly...
A model-based fault management system for a Three Mass Torsion Oscillator is described. Fault management includes fault detection, fault diagnosis and fault compensation. A process model of system dynamics is derived. Friction effects are modelled by a neuro-fuzzy Local Linear Model Tree (LOLIMOT) approach. Parameter estimation is obtained with two simple experiments. A friction estimation stage is...
This paper dealing with the problem of modeling an Electro Power Steering System. In a previous paper in this proceedings (part I) we have introduce a new position model reference structure composed of two inter-connected models. Here we present the reference model control strategy used for this application. The resulting control structure has three major components: an inner force feedback loop with...
Aiming at the simulation for the prime mover supplied by thyristor, the principle and the fundamental methods to dynamically simulate the self-balancing characteristics of a turbine are studied in this paper. A new scheme is presented to simulate the characteristics of the prime mover when the generator simulator operates in various conditions. Nonlinear control components are adopted to solve long-existing...
Aiming at the simulation for the prime mover supplied by thyristor, the principle and the fundamental methods to dynamically simulate the self-balancing characteristics of a turbine are studied in this paper. A new scheme is presented to simulate the characteristics of the prime mover when the generator simulator operates in various conditions. Nonlinear control components are adopted to solve long-existing...
Switched reluctance machines with its uncomplicated structure, low cost, high reliability and fault tolerance, is struggling to gain higher market share almost in all electric machinery utilities. Its simplicity encouraged researchers to apply a wide variety of classic and intelligent control techniques. These techniques are used to control the speed and torque via appropriate determination of switching-on...
Wound Rotor Induction Machine (WRIM) is used in various motoring and generating applications. Control of this machine from rotor side improves the operating speed and reduces the rating as well as cost of converter. The method proposed in this paper is field oriented control of WRIM with single current sensor. Rotor reference currents of current controllers are used for estimating the un-sensed rotor...
This paper describes a generalized method to develop steady state model (SSM) of different electric motors comprising electric equivalent circuit (EEC) and the torque equation. In most of the books on electric motors, EEC is used to explain operation and performance characteristics of motors, but the development of these EECs is not explained convincingly. This work overcomes this shortcoming by specifically...
In this paper, a control strategy for switched reluctance motor(SRM) based variable speed drives is proposed. The phase inductance profile for an SRM being nonlinear, a small signal model based method is applied in a restricted way to design and then implement the controllers based on a linearised model. Two control loops — a Pi-controller based speed loop and and a hysteresis controller current loop...
Induction motors are the workhorse of modern industry. Three-phase induction motors are the most common and frequently encountered machines in industry because of their simple design, rugged, low-price, easy maintenance and wide range of power ratings ranging from fractional horsepower to 10 MW. A low cost technique based on principle of motion is presented here to measure torque against speed of...
This paper presents an investigative work about the application of State Space Model-Based Predictive Control in a three-phase Permanent Magnet Synchronous Motor with trapezoidal back-electromotive force, for speed control. Such motor is utilized in the white goods appliances industry and also in automotive and medical applications, among others, especially due to its high effiency and long life cycle...
This work presents an computational tool of unbalanced voltage supply detection on-line in induction motor. A technique based on Goertzel algorithm has been used to compute the desired component frequency for real time application. The computer algorithm has been implemented in a low cost microcontroller (Arduino). Two successful methods have been used for condition monitoring of induction motors;...
The Solenoid Powered Engine (SPE) is one of the feasible alternative prime movers to replace the existing electric motors. From the machine's design and operational perspective, this particular prime mover design holds a few advantages over the existing electric motor designs. However, SPE development is still in its infant stages and future studies and improvements are required to further refine...
In recent years the availability of petroleum resources has decreased, which has paved the way for Electric Vehicles (EVs) and Hybrid Electric Vehicles (HEVs). In order to achieve a better drive range and improved performance of the motor, control techniques are necessary for the DC to DC power converters which are used in these vehicles. Designing of linear controllers for these converters like Proportional...
This paper presents a proportional-integral (PI) Fuzzy rule based controller using Matlab for speed control of a dc motor. Also an analysis and performance evaluation of the proposed controller design has been carried out and presented in this paper. The fuzzy logic controller is designed using Fuzzy logic toolbox in Matlab, A mathematical model based on fundamental equations governing the operation...
This paper presents the nonlinear control for variable speed wind turbine (VSWT). The dynamics of the wind turbine (WT) are derived from the single mass model. The control objective is to maximize the energy capture from the wind with reduced oscillation on the drive train. The generator torque is considered as the control input and it depends on the optimal rotor speed which is derived from the effective...
Identification of the induction machine substituting circuit parameters is very difficult despite the fact that induction machines are the simplest of all. This is caused by the fact that electrical quantities cannot be measured in the rotor cage. In addition there is proved in the literature, that classical Γ-network includes too much freedom degrees (i.e. 4), therefore it cannot be identified unequivocally...
In this paper, a new example of applying Routh-Hurwitz stability criterion is provided to design an optimal PD control gains for stabilizing a TORA. We solve analytically an optimization problem, which achieves a fast control response of the TORA. We present two steps to solve the optimization problem analytically. First, we perform a coordinate transformation to the TORA's characteristic equation,...
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