University of Miskolc Department of Automation. RUN-TIME RECONFIGURATION OF AC DRIVE CONTROLLERS. Vásárhelyi József. E-mail: [email protected] Details about the author.
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There are different approaches to define the reconfigurable systems [Brebner, Hauck, Luk, Maciejowski, Shirazi, Vuillemin].
Reconfigurable systems are usually considered those computing platforms whose architecture is modified by the software to suit the application at hand.
Most of Re-configurable Computing Systems are plug-in boards made for standard computers and they act as a Co-processor attached to the main micro-processing unit.
There was demonstrated significant potential for the acceleration of computing in general-purpose applications [Hauck, Smith, Villasenor, Vuillemin].
To treat the reconfiguration as a process one need a simple model for specifying and optimising designs, which contain elements that can be reconfigured at runtime.
Comparing to the number of applications known in the reconfigurable filed just a few of them are concentrated in the study of vector control for AC drives.
Vector control is a special field for digital signal processing.
There are known dedicated DSP processors for digital motor control and successful implementations of vector control [Beierke] are referred. The DSP implementation of speed-sensorless induction motor drive using artificial intelligence is also known [Vas].
Up to now the studied literature by the author, only the research of Monmasson and his group is reported as direct application of reconfigurable structures in vector control for AC Drives [Monmasson, Tazi]. The most significant result introduced in reconfigurable control was the parallel-machine control architecture.
Flux observations that the performances of different types of vector controlled drives are different, depending primarily on the range of speed.
Vector control structure for AC drive
Source Texas Instruments
The most often used method to control induction motors is the field oriented control method to achieve the best dynamic behaviour.
Using the Park’s direct and reverse transformations the AC drive can be controlled like a separately exited DC machine, whereby the direct (d) path is representing the flux building component and the quadrate (q) path sets the electrical torque.
Best results are obtained when the magnetising current imR is kept constant, which is direct proportional to the rotor flux r under the assumption that the main inductance Lh is constant
(3) - (4)
Based on the mathematical model of the induction machine in field co-ordinates, given in equation (1-4), a controller was developed and a flux model was derived.
Two-Level Current Tracking Controller
Field Oriented DC Quantities
Two Phase AC Quantities
Vector control system for voltage-source inverter-fed induction machine
Starting from the mentioned modularity a reconfigurable controller structure it is introduced.
Xilinx’s FPGA Virtex:
Q and P represent the two control structures, C and C’ represent the reconfiguration control, [is] and [is]* are the observed current signal and the current control signal, respectively.