June 22, 2008
June 22, 2008
June 25, 2008
Electrical and Computer
13.1386.1 - 13.1386.13
Virtual Instrumentation Interfaces For Real-Time Control And Display Of Electric Machine Drives
This paper presents a real-time instrumentation setup that benefits the subject matter in two courses: electric drives and test and measurement. The paper discusses virtual instrumentation-based interfaces for real-time control and display of electric machine drives. This approach will lead to the flexibility of applying this setup as a platform to study electric drives as well as the LabVIEW-based (from National Instruments, Inc.) experimentation design.
In this lab, the machine drive is implemented using a distributed real-time simulation system from Opal-RT 1 with machines and power electronics drive board as hardware-in- the-loop (HIL). The simulation executes on a hardware configuration consisting of the Command Station (host PC) communicating with the target node (another PC) via Ethernet communication links, I/O boards interfaced to HIL. The Command Station serves as the user interface to edit and modify models, to view model data, to execute the model, to compile the model into C code and load the code onto each target node. The target nodes perform real-time execution of the model simulation and include a real-time communication interface between the nodes and I/O modules. The models are designed and implemented in Simulink (from The Mathworks Inc.). For instance, the experiment to perform an open-loop control of a dc motor consists of the following setup: a dc motor under test coupled with a DC motor as load. For the experiment, the control to the dc motor under test is fed to a chopper. The steps may involve (a) creating a Simulink model for a pulse-width modulation control to run the dc motor at the desired speed, and (b) building the LabVIEW interface with controls for variables such as the reference speed of the motor (rpm), the reference frequency (Hz), numerical indicators to display the frequency of the induction motor, the speed of the DC motor, and graphs for phase voltage and phase current waveforms.
The experimental setup is modeled after the one proposed by the University of Minnesota 2, 3 . However, the setup along with the modification to the model with the dc motor assembly in the loop (HIL) is first correctly executed under the RT-LAB real-time system solution. This paper will give a brief description of a real-time controlled machine drive experiment, but the main focus is on the LabVIEW interface and measurement design to enhance the flexibility and capability to provide measurement analysis and control with visual interfaces. Not only does this LabVIEW application enhance the functionality of this experiment, but it also provides a platform of implementation and testing for the students studying LabVIEW design as part of the Test and Measurement class.
Sundaram, R., & Mak, F., & Tandle, S. (2008, June), Virtual Instrumentation Interfaces For Real Time Control And Display Of Electric Machine Drives Paper presented at 2008 Annual Conference & Exposition, Pittsburgh, Pennsylvania. https://peer.asee.org/3527
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