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Variable structure control (VSC) theory is applied to analyze and design AC servo system for field-oriented permanent-magnet synchronous motor, which is based on Luenberger load observer. Some results of simulation experiments suggest that the AC servo system based on VSC has speedy response, high accuracy and strong robustness against its parameter variations and load disturbances. Its performance...
Double-loop control systems of brushless DC motor (BLDCM) yield a combination of desired characteristics including simplified control structure, high speed accuracy, wide operating speed range and fast dynamic response. The current loop is very important for system performance. Its linearity is influenced by the accuracy of feedback current. The cost of detecting currents in three windings is higher,...
In this paper, a combined control strategy of Single Neuron PID and normal PID is proposed for the switched reluctance motor, which has simple structure, adaptability to environmental changes and strong robustness. The input of outer loop is error of speed while output is torque which enters the inner loop of the Direct Torque Control system to control a three phase 6/4 pole SRM whose capacity is...
Dual motor drives fed by single inverter are purposely designed to reduced sizes and cost with respect to single motor drives fed by single inverter. This paper presents the speed responses behavior of Dual Permanent Magnet Synchronous Motor (PMSM) driven base on two different PWM control schemes, which are Space Vector Pulse Width Modulation (SVPWM) and Hysteresis Current Controller. These two techniques...
A fault-tolerant technique valid for both open-loop and vector-control motor-drive systems is introduced in this paper. The technique is merely presented for AC motors with Delta-connected circuits in their stator windings. Hence, it enables the operation of the three phase motor upon a failure in one of its phases without the need of a special fault detection algorithm. This technique is to significantly...
The main objective of this paper is to control the speed of an induction motor by using seven level diode clamped multilevel inverter. To obtain high quality sinusoidal output voltage with reduced harmonics. The proposed Scheme for diode clamped multilevel inverter is multicarrier SPWM control. An open loop speed control can be achieved by using V/f method. This method can be implemented by changing...
This paper presents novel direct torque control (DTC) algorithms for induction motor drives for the reduction of common mode voltage. In the Proposed DTC algorithm-I the space vector plane is divided into six sectors same as that of Conventional DTC algorithm. In the proposed algorithm-II, the space vector plane is divided into twelve sectors instead of six sectors as in conventional DTC algorithm...
This paper presents some specific issues of a high speed permanent magnet synchronous motor control used in a combustion engine supercharger system. A description of a method designed to limit the load angle of synchronous motor in high speed is given. Also experimental results in dynamic states are shown. In these states mainly acceleration times and energy intensity with correlation on motor current...
In this paper, a new control strategy is proposed to improve the performance of a wind generator system composed of a three-phase PMSG and a Back-to-Back three-phase to single phase converter. With the use of the large inductance of the synchronous generator, the control method minimizes the generator torque ripple when the system supplies a single-phase load. The problem arises from the fact that...
Six-phase motors are widely used in industry, for they can be useful in increasing motor capacity with limit voltage level, and be more reliable in continuous operating and be more robust in performance controlling. Up to the present, there have been many researches on six-phase motors, and they are usually analyzed by analytical methods. However, most of six-phase motors are used with variable frequency...
This paper proposes a particular method for position velocity loops to solve the velocity control problem associated with conventional sliding mode control of permanent magnet synchronous motor (PMSM) servo system. The merits of conventional sliding mode control approach and PID control technique were introduced to design this novel controller for the position and velocity loops. The sliding mode...
This paper presents an investigation on the mechanism of the impact of the governor control on power system dynamics, and an introduction of boundary frequency. The well-known Hefferon-Phllips math model has been extended to include the math model of the turbine and its governor. By using this model the impact can be divided into the synchronizing and the damping torques. Based on the analysis of...
The present investigations relate to the development of TRIAC-DIAC based DC series motor speed controller for mud pumps of industrial drill-rig equipment. This paper deals with mud pumps on drilling rigs provide the means for supplying flow and pressure of the chemical mud fluid through the drill pipe, drill bit and return to the surface via the annulus of drill pipe. In this process, the mud maintains...
This paper studied mathematical model of doubly-fed induction generator (DFIG) based wind turbine generation system under unbalanced voltage. A dual-PI current control strategy was proposed to improve the performance of DFIG's rotor side convert (RSC) under asymmetrical voltage condition. The symmetrical component theory is employed to decompose asymmetrical three-phase variable such as voltage and...
This paper presents an elegant technique for mitigating the output power fluctuations from a grid connected Opti-slip induction generator (OSIG), due to sudden wind gusts leading to input drive torque variations. The proposed technique has also been extended to control the amount of real power into the grid at the desired value. The control of OSIG is achieved using the basic principles of chopper...
Voltage source inverter (VSI) fed induction motors are widely used in variable speed applications. Space Vector Pulse Width Modulation (SVPWM) has become the successful techniques to construct three phase sine wave Voltage Source Inverter (VSI) parallel to control three-phase induction motor using v/f control. Because of the low maintenance and robustness induction motors have many applications in...
This work investigates the impact of increased penetration of doubly fed induction generators (DFIGs) on electromechanical modes of oscillations of a large interconnected power system. The work proposes a control mechanism aimed at designing the power system stabilizer (PSS) for a DFIG similar to the PSS of synchronous machines. The wind generator power output is taken as input to the PSS. The active...
A three-phase squirrel-cage induction motor is used as a propulsion system of an electric vehicle (EV). The motor is controlled at different operating conditions using a direct torque control (DTC) technique known to have simple control structure with comparable performance. Whereas in a conventional DTC drive, the weakest points is the optimal voltage space vector choice. In this paper Artificial...
In this paper a high performance Direct Torque Control (DTC) theme for the induction motor fed by indirect matrix converter is proposed and investigated. Since the indirect matrix converter has an intermediate dc link, the control process can be separated into rectifier stage modulation and inverter stage modulation. Indirect space vector modulation (ISVM) for input current is applied on the rectifier...
This paper presents a high performance Direct Torque Control (DTC) theme for the induction motor using Indirect Matrix Converter (IMC). To improve the dynamic behavior of motor, Active Learning Method (ALM) is implemented on the DTC. The ALM uses its own modeling technique called the ink drop spread (IDS) method. Functionally the IMC is very similar to the Direct Matrix Converter (DMC) but it has...
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