Abstract
A new optimal pulse width modulation (PWM) technique with unsymmetrical switching angles was introduced for high power applications. The exact switching angles, calculated off-line by the optimal PWM technique, were shown. Then the effective initial values of the real-time solution process were obtained by interpolation based on uniform grid of off-line switching angles. The effective iterative process and algorithm of real-time solution of the optimal PWM equations were developed. Therefore a specific harmonic can be controlled by its amplitude and phase angle. A new real-time implementation scheme has been carried out in a state of feedforward control based on the solution of nonlinear harmonic equation system using a digital signal process DSPTMS320C40. The calculation time was measured for 6 independent switching angles within about 200 μs for an iteration process. And the calculation of switching angles with six degrees of freedom has been performed within 1ms for each half fundamental period waveform. Finally the digital discrete time error sensitivity of the switching angles for harmonic output was discussed.
| Original language | English |
|---|---|
| Pages (from-to) | 80-84 |
| Number of pages | 5 |
| Journal | Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering |
| Volume | 26 |
| Issue number | 22 |
| Publication status | Published - 16 Nov 2006 |
| Externally published | Yes |
Keywords
- Algorithm of real-time solution
- Digital signal process
- Optimal pulse pattern
- Pulse width modulation
ASJC Scopus subject areas
- Electrical and Electronic Engineering