A novel phase-locked loop for three-phase ups under distorted utility conditions

作者：Liao, Hui^*; Chen, Yanfeng

来源：2011 International Conference on Electric Information and Control Engineering, ICEICE 2011, Wuhan, 2011-04-15 To 2011-04-17.

DOI：10.1109/ICEICE.2011.5777602

• Distorted utility conditions
• Fundamental wave
• Instantaneous power
• Phase information
• Phase locked
• Phased locked loops
• Positive-sequence components
• Zero crossing points

The characteristic of PLL (phased-locked Loop) has very important influence on the performance of UPS (uninterruptible power supply). Sometimes, false phase can be locked by the classical PLL circuit based on detecting the zero-crossing points due to the wrong phase information under distorted utility conditions. This paper proposes a novel PLL which implements phase-locked through eliminating the DC component of instantaneous power for three-phase UPS. The proposed PLL system can detect the positive sequence components to realize phase-locked for the fundamental wave voltage of unbalanced utility. The model of PLL has been analyzed. How to determine the parameters of loop filter has been proposed. The system is controlled by 32 bit DSP, TMS320F2812. The good performance of the PLL system for three-phase UPS has been verified by simulation and experimental results.

• 出版日期2011
• 单位华南理工大学