نتایج جستجو برای: direct vector control
تعداد نتایج: 1869180 فیلتر نتایج به سال:
The paper presents a super-twisting sliding mode (STSM) regulator with neural networks (NN) of direct power command (DPC) for controlling the active/reactive power of a doubly-fed induction generator (DFIG) using a two-level space vector pulse width modulation (2L-SVPWM). Traditional DPC strategy with proportional-integral (PI) controllers (DPC-PI) has significantly more active/reactive power r...
To solve the problems of torque ripple and inconstant switch frequency of inverter in the conventional direct torque control (DTC), a novel DTC method using space vector modulation (SVM) is proposed based on input– output feedback linearization technique, where hysteresis controller is substituted by input–output feedback linearization and switch table is substituted by SVM. In order to preserv...
This paper addresses the high-precision tracking of mechanical systems with friction effect. A simple integrated proportional-derivative (PD) scheme is proposed where a support vector machine is incorporated to deal with friction. The bounded tracking is proved with Lyapunov’s direct method and the bound of tracking error can be made arbitrarily small by selecting large control gains. A major a...
Vector Product Format (VPF) based databases store geographical data in a relational framework, where individual VPF files are arranged hierarchically in a directory tree structure. Access and update of the VPF data can become difficult due to fragmentation of data among multiple tables. This paper presents an object-oriented model for the management of a VPF database, which provides easy access...
Background and Aim: Cutaneous leishmaniasis (CL) is the main vector-borne disease in Iran. There are two types of rural and urban CL which are transmitted by Phlebotomus papatasi and Phlebotomus sergenti. Military forces are more susceptible to this disease than other people due to their job conditions. In case of infection, according to the commune period, they can spread the disease to other ...
in this thesis our aim is to construct vector field in r3 for which the corresponding one-dimensional maps have certain discontinuities. two kinds of vector fields are considered, the first the lorenz vector field, and the second originally introced here. the latter have chaotic behavior and motivate a class of one-parameter families of maps which have positive lyapunov exponents for an open in...
9. PERMANENT MAGNET SYNCHRONOUS MACHINE (PMSM) ......................................... 1 9.1 PMSM Configurations and Machine Parameters ................................................................ 2 9.2 Equivalent Circuit and Vector Diagram of a PMSM ........................................................... 8 9.3 Current Vector Control ......................................................
the efficiency of induction motors decreases at light loads. efficiency optimizer control systemsadjust the motor flux value to achieve the best efficiency in a wide range of load variations. reduced fluxoperation has some other benefits such as power factor improvement and torque ripple reduction. the latter isan important issue in a direct torque controlled induction motor drive. in this pape...
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