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In this paper a position sensorless control applied to a synchronous reluctance machine for an industrial drive application is discussed. For a given stator of an induction machine a synchronous reluctance rotor with flux barriers is designed by finite element methods and a prototype machine is built up. In this application the synchronous reluctance machine drive has already replaced the induction...
Induction motor is an electric motor which has many advantages. One of them is robust and relatively cheap. But has some disadvantages in the regulation of speed, because of that, the system need smart control to operated the induction motor. in this case used Backstepping control as intelligent control to maximize the performance of induction motor. In this method Indirect Field Oriented Control...
The main objective is to study dynamic behavior of hydro generator at variable excitation. This paper presents analysis of the dynamic behavior of a hydroelectric power plant including hydraulic system, electrical installations, rotating inertia and control systems. First, the modeling of the electrical and hydraulic systems is described. The electrical system is constituted by a salient-pole synchronous...
In this paper, the optimal speed control, based on Linear Quadratic Regulator (LQR) theory, through stator field orientation (SFO) of an inverter fed induction motor is addressed. The voltage source inverter, behaving as an actuator, is operated using space vector pulse width modulation (SVPWM) technique. The state feedback system is augmented with integral output error to enhance reference tracking...
In order to compare braking performance of dual torus hydrodynamic retarderwith different blades, the braking performances of dual torus hydrodynamic retarder with the bowed blade and different angle straight blades are calculated. The internal flow fields of different blade hydrodynamic retarder are numerically simulated by computational fluid dynamics (CFD) method. The braking torque, the distribution...
The paper discussed several designed variants of TFG with different number of poles, speed and dimensional coefficients starting from two base module variants with a rated power of 8kW and 11 kW respectively. The proposed layout came from reluctance one and it is suitable to equipped stand-alone electric power plant being a proper solution for isolated farms. The influence of large number of poles...
The speed control of electric machines employed in automotive electrical traction drives is a challenging problem. Indeed, these applications are subject to physical and computational constraints. This paper addresses this challenging problem by employing a multi-rate predictive cascade state-space control structure, focusing on the design of the outer loop controller. Firstly, the mathematical model...
This work proposes a new control scheme for electrical drives system, named cascaded predictive speed control (PSC). The strategy seeks to maintain the simplicity of the classic predictive control while excluding linear or other controllers. The control strategy has a cascade architecture, similar to the techniques of classical control (FOC or DTC). The outer loop controls the speed of the machine,...
The speed control problem of permanent magnet synchronous machine drives is a challenging problem which has to deal with physical and computational constraints. Moreover, the speed control has to provide also the references of the stator currents. The goal of this paper is to develop an effective control methodology for speed control in permanent magnet synchronous machine drives using a two step...
We present the performance of a micro ultrasonic motor using a stator with a volume of approximately one cubic millimeter, which is one of the smallest ultrasonic motors. The stator consists of a metallic cube with through-hole, a rotor shaft is inserted to the hole, and piezoelectric elements adhered to its four sides. When voltages are applied to the piezoelectric elements, the stator generates...
According to the exist problems of traditional electromechanical theory, this paper make new analysis and industrial test on ac motor speed control principle, propose a new power control theory on ac motor speed control, that is ‘P’ theory. This theory is: motor speed control principle comes from mechanical. Speed regulation is the control of mechanical power in nature. Therefore, electric control...
This paper proposes the predictive controller design for a sensorless interior permanent magnet synchronous motor drive system. The predictive controllers include a current-loop predictive controller and a speed-loop predictive controller. By using the proposed control algorithms, the closed-loop sensorless interior permanent magnet synchronous motor drive system can achieve fast transient responses,...
Precise speed control of an Interior Permanent Magnet Synchronous Motor (IPMSM) drive becomes a complex issue due to complex coupling among its winding currents and the rotor speed as well as the nonlinear nature of the developed torque. The system nonlinearity becomes severe when the IPMSM drive operates in the field weakening region. The main purpose of this paper is to present the implementation...
A dual mechanical port electric (DMP) machine is used as an electrical variable transmission (EVT) in hybrid electric vehicle (HEV). In the conventional HEV, this machine is replaced to planetary gear box and two electric machines and makes their structures simpler. In this paper improved vector control of DMP machine with optimum design of PI speed controller and implementation of MTPA method is...
Brushless Doubly-Fed Machine (BDFM) is a machine which incorporates the robustness of the squirrel cage induction machine while having the speed and power factor control of a synchronous machine. A special kind of rotor called Nested-Loop rotor plays an important part in the BDFM, coupling the two stator fields. In future BDFM will share a large part in wind power market. This paper presents a mathematical...
Problem of control associated wind energy conversion systems using horizontal-axis fixed-pitch variable-speed low-power, working in the partial load region, consisting in the energy conversion maximization, is approached here under the assumption that the wind turbine model and its parameters are poorly known. Maximum Power Point Tracking (MPPT) by using an approach derived from the optimum seeking...
Wind Turbine (WT) systems based on Permanent Magnet Synchronous Generators (PMSG) have become important mainly due to their high power factor and high efficiency. In order to reduce costs, maintenance and complexity, speed and position estimators can be used to replace the corresponding sensors in low and high power WT. This paper studies a PMSG flux observer, which is used along with a PLL to estimate...
This paper designs a novel control method for energy efficient and wide speed range drive of the PMSM. The proposed method includes several parts: (1) using a PI speed controller to create a signed current norm value as input of the command converter. (2)The command converter can simply and accurately generate an analytical current command according to the current control standard satisfying the maximizing/current...
Several techniques are available for speed control of induction motor drive. The Direct Torque Control (DTC) method is simple and efficient because of independence of rotor parameters and free from d-q transformation. It is observed that dynamics of DTC drive can be improved by using estimators, observers, and machine intelligence systems. This paper proposes a new technique namely Sector Advancing...
In the traditional direct torque control (DTC) of induction motor, the low order harmonic component of stator current is very large when the motor is running at low speed. It leads to high torque ripple of motor in low speed. To solve this problem, a new control method has been proposed in this paper. Base on the traditional DTC method, electromagnetic torque and flux models have been analyzed. To...
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