Implementaion of a DSP-based Vector-Controlled Inverter

• Main Authors: Ming-Fuh Wang, 王明富
• Other Authors: Chang-Huan Liu
• Format: Others
• Language: zh-TW
• Published: 1994
• Online Access: http://ndltd.ncl.edu.tw/handle/52457840921163597849

碩士 === 國立臺灣科技大學 === 電機工程研究所 === 82 === A vector-controlled inverter is proposed for ac induction speed control drivess by using a digital signal processor (TMS320C/ E14). In the digital controller, the d-q model,indirect field oriented vector control algorithm and synchronous reference frame theory are employed to transform the highly nonlinear dynamic system into a simplier decoupled dc-like machine and both the current and the speed controller dessign can be easily done in frequency domain. The PWM generator algorithm of vector-controlled inverter adopted the voltage space vectors algorithm. It was shown that sinusoidal modulation generated in ace vector representation has the advantages of low harmonics . A possibly high modulation index compared with the SPWM method. the dynamic of the inverter is both simulated by using the SIMNON program and implemented in TMS320C14 assembly language. In the experiment, the effect of "dead time" is also investigated based on the output voltage waveforms of a bridge inverter using voltage space vector PWM. The results show that the dead time causes a reduction in the fundamental component of the output voltage and introduces low order harmonics. Methods for compensating the dead time are then proposed and implemented in hareware.