| |
Steady-State Analysis of Soft-Switched Three-Phase Grid-Tie DC-AC Converter Isolated by High-Frequency Transformer for High Efficiency and Low THD
| [View]
[Download]
|
| Author(s) |
Mahmoud A. Sayed ABDALLAH |
| Abstract |
This paper presents a new mathematical model and soft-switching technique for the matrix-based highfrequency link (HFL) DC-AC converters. The converter topology uses an H-bridge converter linked with a single-to-three-phase matrix converter by a high-frequency transformer (HFT). The proposed mathematical model provides the matrix converter switches with the accurate duty cycles by compensating the trapezoidal approximated waveform of the HFT current. Soft-switching of all switches is realized by connecting shunt ceramic capacitor across each switch. This enables, simultaneously, zero-current switching (ZCS) for the OFF-going switches and zero-voltage switching (ZVS) for the ON-coming switches. Also, the proposed control technique regulates the battery DC current to follow the reference value and injects a sinusoidal three-phase current to the grid at unity power factor. In addition, the control technique is able to adapt with severe sudden reduction in the three-phase grid voltages and ensures safe operation of the converter. Compensated duty cycles of the matrix converter reduce the THD of the grid current, whereas the soft-switching enhances the system efficiency. The validity of the system has been verified experimentally using a 200 V/2.0 kW laboratory prototype system. |
| Download |
| Filename: | 0150-epe2018-full-16243265.pdf |
| Filesize: | 1.193 MB |
|
| Type |
Members Only |
| Date |
Last modified 2019-05-05 by System |
| |
 |