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Flexible And Modular DSP Based Real-Time Implementation of Power Electronic Systems

S. Rajagopalan1, V. V. Sastry2, V. Ajjarapu2, S. S. Venkata2 1 Graduate Student, Georgia Institute of Technology, Atlanta, GA 30332 2 Iowa State University, Ames, IA 50011

Abstract

The massive growth of high performance digital signal processors (DSP) in the last two decades has led to a revolution in the wireless communications. Real-time control is being actively pursued in the recent past for applications such as high performance motor drives, VAR and harmonic compensation and energy efficient optimization strategies. Such developments in real- time are seen under topics such as rapid prototyping and hardware-in-the-loop simulation. In this paper, the application of DSP based real-time control technique towards design and development of power electronic equipment is explained through the use of the TI TMS320F240/243 digital signal processor keeping the above ideas in mind. Power electronic building blocks that compose of both hardware and software have been developed and used for rapid prototyping of existing power electronic converters. A modular approach has been followed while building these systems. This modularity has given rise to flexibility in choosing and experimenting with various power electronic systems with the given hardware through a software approach.

I. Introduction

In the last few years, the concept of integrated real-time control has been gaining importance in power electronic applications. This is the reason, why modern power electronic systems employ new techniques such as digital signal processing. Hence a modern power electronics lab should have a powerful thrust towards digital real-time control besides a good exposure to the hardware basics. However most of the literature indicates that the concept of real-time control has been limited to solving specific problems encountered in power electronic systems such as online monitoring of machine parameters for electrical drives, continuous fault diagnostics and real- time control of electrical drives.1-7 Real-time systems are also being used for harmonic minimization and new filter schemes such as adaptive filtering8-11. Applications that are more specific include uninterrupted power supplies (UPS) and extraction of parasitic elements in power semiconductor devices.12-14 As these applications are specific in nature, they cannot be used to impart any education to a fresh graduate engineer to this approach.

A generic real-time simulation approach using dual DSPs for power electronic systems was attempted a few years ago.15 However, this approach suffers from the drawback that multiple DSPs were used, thereby increasing the price and complexity of the system. Moreover, this approach was rigid in nature as one could not experiment with a number of power converter topologies in a short span of time. Real-time rapid prototyping tools based on “Proceedings of the 2002 American Society for Engineering Educat ion Annual Conference & Exposition Copyright © 2002, American Society for Engineering Education”

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Vedula, S. (2002, June), Flexible And Modular Dsp Based Real Time Implementation Of Power Electronic Systems Paper presented at 2002 Annual Conference, Montreal, Canada. 10.18260/1-2--11350