The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper presents a closed loop vector control for an interior permanent magnet synchronous motor (IPMSM) drive incorporating a neuro-fuzzy controller (NFC) and a fuzzy logic controller (FLC). The NFC serves as the speed controller of the drive. It is designed so as to generate the appropriate command q-axis current and ensure dynamic speed control. The back-propagation technique is used for the...
This paper proposes multivariable PI control strategies for humidity and temperature of neonate incubator loop This process is a TITO system (Two Input Two Output). The transfer function matrix was identified using closed loop step response through sequential method that decouples the TITO system into four independent loops. Models of three parameters were used for the system loops due to simplicity...
This paper presents a novel design of adaptive sliding mode observer. An adaptive sliding mode observer with a proportional and integral sliding surface is derived and the stability condition of the closed-loop system is established. The proposed adaptive sliding mode observer could reconstruct the unmeasured states and estimate unknown system parameters in real time despite parameter variations and...
A method is presented in this paper to design proportional-integral (PI) controller for industrial processes which are modeled by second order plus dead time transfer function. Frequency domain approach is employed in order to construct this method. For this purpose some frequency characteristics constant loci such as gain and phase margins constant loci are determined and plotted in the controller...
In this paper, we compare two solutions for suppressing slug flow in pipes conveying a diphasic fluid by active feedback control of the outlet (production) choke. Conventionnaly, a non-collocated PI controller is used to stabilize the measured inlet pressure. Unfortunately, this method lacks robustness to changes in operating conditions and reveals difficult to calibrate. In this work, we propose...
Neural network inverse control is applied to doubly-fed generation system, and the mathematical model of inverse system is derived from the power control model of the doubly-fed induction generator. Through the proper selection of input and output signals of inverse control system and the use of neural network inverse control algorithm, the system is decomposed into two single-variable linear subsystems...
In this paper we introduce an adaptive structure that dynamically calculates the gains of a PI controller, in presence of parametric disturbances in the controlled process approach, with the purpose of maintaining a desired pole assignment in closed loop, besides fulfilling a specified time closed loop performance. The designing procedure presented in this work is useful when the process to be controlled...
In dual closed loop direct current governor system, startup current is usually much larger than rated current so that current restricting problem must be considered during startup stage of direct current motor. In this paper, a dual closed loop robust control scheme is presented for a direct current governor system with input constraints by using robust right coprime factorization approach. PI regulator...
Switching power amplifier for magnetic bearing is a nonlinear system. An accurate system model is presented. According to the operating modes of three-level switching power amplifier, the math model of power amplifier based on the state-space averaging model is deduced. By using this math model, the closed-loop system transfer function can be analyzed. The PI controller parameter can be designed according...
A nonlinear mathematical model of three-phase voltage source PWM rectifier is established in the dq rotating frame. Aiming at the poor dynamic performance of conventional PI controlled three-phase PWM rectifier, a control system with double close-loops of voltage and current is designed based on the mathematical model of 3-phase PWM rectifier. A sliding-mode control algorithm on synchronous rotating...
This paper presents a comprehensive analysis of the direct torque and flux control (DTFC) scheme for interior permanent magnet synchronous motor (IPMSM) drives. Closed-loop regulation of the torque and stator flux linkage are achieved via two independent proportional-integral (PI) controllers. The reference voltage vectors are generated by a space vector modulation (SVM) unit. A mathematical analysis...
The mathematical model of linear induction motor (LIM) based on slip frequency type vector control system is established. A self-adjusting fuzzy controller (SAFC) is designed as magnetic thrust adjuster of the motor. The speed of the motor is adjusted by control magnetic thrust of the motor. The scheme of the slip frequency type vector control system of the LIM is obtained by observing the magnetic...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.