Article
A Basic DSP Processor-Based Sector-Independent Space Vector Modulation
This document demonstrates the process of building a sector-independent Space Vector Modulation (SVPWM) system using a DSP processor in fundamental motor drive systems. The implementation of traditional space vector modulation proves complex because it includes extensive calculations. Before moving forward, it is essential to determine the magnitude of voltage vectors according to speed specifications and Volts/Hz data in software and hardware domains. Computing the phase angle and quadrant and sector determination enables the calculation of switching time segments based on decomposition matrices. This proposed algorithm dissipates all computational requirements that exist in traditional approaches. The closed loop control system achieves precise switching period control through fixed compare register values which it implements using the Volts/Hz principle. Through its built-in Space Vector Pulse Width Modulation hardware module, the TI TMS320LF2407A generates PWM pulses that include four switching states within one PWM period. The performance evaluation of the 4-hp induction motor supplied by IGBT-based inverter modules generated through DSP processor control pulses showed promising results.
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