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In this paper a fast flux search controller based on the Neuro-fuzzy systems is proposed to achieve the best efficiency of a direct torque controlled induction motor at light load. In this method the reference flux value is determined through a minimization algorithm with stator current as objective function. This paper discusses and demonstrates the application of Neurofuzzy filtering to stator current...
This paper presents the robust speed and parameters control of induction motors (IM) without speed sensors. The reactive power Model Reference Adaptive System was used to estimate the speed. The method is independent from stator resistance and pure integrator in reference model. Furthermore, parameters, used in the speed approximation, are not affected by temperature change. A squirrel-cage induction...
Power electronic inverters are becoming more and more popular for various industrial drive applications. Many kinds of multilevel inverter topologies have been proposed to enhance the performance of motor drive system during last two decades. In this paper, a sensor-less drive of induction motor based on a new hybrid cascaded multilevel and SVM controls are presented. In the proposed drive system,...
In this paper, the most suitable time to replace to the damaged element in open-loop and closed-loop control for the fault-tolerant induction motor drive system is presented, with a previous stage of fault-diagnostic to detect a short-circuit or open-circuit failure in the power device. The technique is based on the connection of bidirectional switches to isolate electrically the damaged element by...
The reference frame theory constitutes an essential aspect of electric machine analysis and control. In this study, apart from the conventional applications, it is reported that the reference frame theory approach (RFTA) can successfully be applied to real time fault diagnosis of electric machinery systems as a powerful tool to find the magnitude and phase quantities of fault signatures with good...
Multiphase motor drives have many advantages over the traditional three-phase motor drives. In this paper we firstly deduce the mathematic modeling for a dual-three-phase permanent magnet synchronous motor (PMSM) according to vector space decomposition theory. Then, a sensorless vector control based on the model reference adaptive system (MRAS) is developed for a dual-three-phase PMSM and the system...
In this paper, a closed loop adaptive speed observer is proposed to improve the dynamic performance of a matrix converter (MC) fed stator flux oriented DTC induction motor drive. The speed observer uses estimated rotor fluxes to estimate the rotor speed. The advantages of using a full order Luenberger observer instead of a reduced order closed loop model with the proposed speed observer, for the estimation...
The concept of stator flux orientation control of induction motor (IM) based on the optimal regulator theory has been introduced in the literature. In this paper, the idea is expanded to improve the performance at low speeds by proposing programmable low-pass filter (LPF) for flux vector synthesis. The developed control structure provides high-quality signal for the stator frequency. This signal is...
In this paper, an uniform mathematic model of three-level inverters feed induction motor drives system has been constructed. Based on the application of the discrete space vector modulation (DSVM), a DTC strategy of three-level inverters induction motor drives system is proposed. With DSVM-DTC algorithm, the neutral-point (NP) voltage balancing problem and high dv/dt of output voltage is restrained...
Vector control methods have made accurate and fast control of induction machines possible. The success of indirect rotor-flux-oriented-control (RFOC) depends greatly on the accuracy of the machine parameters, especially the rotor time constant. In this paper, rotor resistance data is extracted from standard current-slip tests and analyzed. The data show that the rotor resistance appears to change...
Sensorless control of ac machines which is able to work even at zero speed can be realized using high frequency excitation. Different schemes have been presented recently, which use transient excitation caused by the switching of the voltage source inverter. Transient excitations of only one pair of test vectors are applied for each measurement in this paper. The signals resulting from transient excitation...
The objective of this work is to compare and analyze brushed DC, induction, brushless DC, and synchronous reluctance machines and drives in reciprocating applications. In particular, this work is focused on wave energy generator applications. In contrast to wind energy, the ocean environment can require bidirectional operation of the generator. For this study, the efficiency of a set of small induction,...
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