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The paper describes the direct torque control of the switched reluctance motor drives. A new engineering way for reducing electromagnetic torque ripples in the switched reluctance motor drives was shown. For this purpose, the constructed 3D model which was formed using the Kompas 3D program is presented in the paper. The results of the optimization and simulation using Matlab/Simulink are given.
Indirect rotor field oriented control (IRFOC) plays an important role in the high performance induction machine drives. In the indirect rotor field oriented control — based induction machine adjustable speed control system, the rotor field angle is usually obtained by the rotor angular velocity and the slip angular velocity. The rotor angular velocity can be sensed by an encoder with sufficient accuracy...
The paper firstly establishes a passivity-based control (PBC) of a double-fed inductor generator (DFIG). A new control method of the DFIG is proposed with the outer speed loop controlled by a full-order terminal sliding mode (TSM) controller to undertake maximum wind power point tracking (MPPT), while the inner current control loop is a PBC designed to manage the three-phase PWM rectifier. Simulation...
Progresses obtained in command and power electronics have increased the technical and economic performances of brushless direct current motors. Consequently, the problem of optimum design and operation of these motors, frequently used for driving small vehicles, is a very present one. Studies presented in literature show that high oscillations of torque occur in these motors in a complete rotation...
As one of automotive engine's important working states, idle-speed has much relation to the engine's fuel consumption and exhaust-gas pollution level. Effective idle speed control (ISC) can improve fuel economy and reduce exhaust emissions, the principal operation of ISC is to uphold the actual engine speed very close to the set point value when any disturbance is added. Automotive engines are typical...
This paper addresses the estimation of a permanent magnet synchronous machine mechanical position and speed estimation at low speed and standstill. The method is based on the injection of an additive voltage at High Frequency (HF), which exploits the position dependency to the magnetic saliency. Unlike the usual HFI method, this estimator has a simple structure with only one filter. The simulation...
With the development of the smart meters, demand response (DR) is able to provide fast ancillary services, such as frequency control. Some recent studies demonstrated that DR can perform like thermal generators in the frequency control. However, little attention has been paid to DR's effect on the electromechanical oscillations of the power system. Fast-response DR can not only affect system frequency,...
In this paper there is detailed the asynchronous operation caused by an important overload, of a synchronous motor. There are mentioned the currents of all the windings, main flux, electromagnetic torque, electrical angular speeds of the rotating field and of the rotor which define the amplitudes of the electrical, magnetic and mechanical stresses. The effect of the damping windings resistance in...
This paper emphasizes technical and economic parameters at direct-on-line starting of low power asynchronous motors. There are presented a lot of simulations and there are carried out experimental tests, in order to establish deviations which occur between the two methods. On the basis of the mathematical model presented, it is also possible to study other dynamic states: variation of voltage, of...
In order to stabilize the engine speed, increase the dynamic performance, save the energy, this paper presents a speed sensing control method for an EFI engine. The best operating points of an engine were discussed according to the static characteristics of an engine. Based on the best operating points and the load, the engine speed could be controlled by a double-closed loop control method, which...
The marine industry is seeing an increasing number of vessels equipped with electric propulsion opposed to traditional mechanical propulsion. Electric propulsion has been shown to be advantageous in various land applications such as locomotives and road vehicles however in the marine setting the highly variable hydrodynamic load exposes the electric propulsion system to extreme load conditions. This...
This paper proposes an architecture where each agent maintains a cooperative tendency table (CTT). In the process of learning, agents need not communicate with each other but observe partners' actions while taking actions. If one of the agents meets a bad situation, such as bumping onto obstacles after taking an action. In such a case, agents will receive a bad reward from the environment. Similarly,...
This paper presents a wind-driven DC power generation and control system modified by a doubly fed induction generator (DFIG), which stator is connected with a full-power diode rectifier to supply DC power to a stand-alone load and rotor is connected to the DC link with a PWM converter in charge of regulation of frequency and voltage on stator side. The transient character and behavior of current,...
Switched reluctance motors (SRM) have many differences between traditional motors in performance analysis because of the special structure. First, the characteristics and structure parameters with large influence on the performance of SRM is discussed. Then a method for modeling and simulation of SRM system based on Maxwell and Simplorer is proposed. Finite element model of SRM with different structure...
This paper studies a new intelligent operation technology of high voltage circuit breaker(HVCB). An operating mechanism driven by a three-phase permanent magnet synchronous motor (PMSM) for HVCB is described. Through simulation model, the mechanism's opening and closing operations characteristics are simulated and calculated, and the relationship between the optimal moving contact travel of HVCB and...
The article presents results of parametric identification of mechanical part of drive system with permanent magnet synchronous motor by means of heuristic method of Particle Swarm Optimization (PSO). The assumed mechanical part has a complex structure, consisting of two-mass connected by an elastic joint with backlash. The optimization process was designed to find model parameters that assure the...
This paper presents results of simulation research of off-line trained, feedforward neural-network-based state estimator. The investigated system is the mechanical part of electrical drive characterized by elastic coupling with working machine, modeled as dual-mass system. The aim of the research was to find a set of neural networks structures giving useful and repeatable results of the estimation...
This paper analyzes the dynamic performance of FOC induction machines operating under current and voltage constraints. FOC rely on the proper performance of the inner current control loops. The capability of the machine to increase its torque can be seriously compromised due to the inverter voltage and current limits, which affect to the current regulator transient response. This can be especially...
In order to solve the conventional direct torque control contradiction between the dynamic and static performance, a permanent magnet synchronous motor system direct torque control architecture is proposed based on space vector modulation strategy. In this method flux and torque are controlled through stator voltage components in stator fluxlinkage coordinate axes and space vector modulation is used...
BEMF-based methods, with the purpose of estimating the position and speed of the permanent magnet synchronous machine (PMSM), cannot be applied in low- speed range. Though the high frequency injection (HFI) methods can be operated in low- speed range, they are complicated. For low cost SPMSM applications, it is not necessary to be operated in low- speed range. Thus, an I-f starting method was introduced...
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