June 26, 2011
June 26, 2011
June 29, 2011
Electrical and Computer
22.445.1 - 22.445.11
Designing Online Laboratories for Power Systems Courses Java-Digital Signal Processing (J-DSP) is a web-based, platform-independent, visualprogramming environment that enables users to perform online signal processing calculationsand simulations. The J-DSP Controls (J-DSPC) version provides a user-friendly environment fordesign and analysis of control systems. Due to the nature of control simulations which most oftenrequire feedback, all J-DSPC control blocks have been designed to activate simulations uponcommand issued by the user. All functions in J-DSPC appear as graphical blocks that are dividedinto groups according to their functionality and each block is linked to a control function. Byconnecting blocks together, a variety of control systems can be simulated and outputs at anypoint of a simulation can be examined. The controls version of the J-DSP software allows matrixmanipulations and state-space analysis. Functions and exercises pertinent to analysis of analogand digital systems in an advanced power electronics course have been developed. The studentsbegin by constructing simple transfer function models and analyzing their step and frequencyresponses. The effects of feedback and cascading transfer function models are also studied. Thestudents are also introduced to digital control and harmonic distortions associated with sinePWM systems. A list of exercises to demonstrate the effects of non-linear operations on signals,in terms of total harmonic distortion, and simulate the operation of a sine PWM modulator havebeen developed. Finally, they perform a detailed frequency-domain analysis of transfer functionsand design digital systems by suitably placing poles and zeros directly to achieve a desiredfrequency response. The list of functions developed include sine PWM, total harmonicdistortion, analog and discrete transfer function models, pole-zero plots and frequency domainanalysis for both the analog and discrete cases. These labs will be performed by the students of agraduate level power systems course and we will present results of the student assessment in thefinal version of our paper.
J.Thiagarajan, J., & Ayyanar, R., & Spanias, A. S. (2011, June), Designing Online Laboratories for Power Electronics Courses using J-DSP Software Paper presented at 2011 ASEE Annual Conference & Exposition, Vancouver, BC. https://peer.asee.org/17726
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