Analysis method of DVR compensation strategy based on load voltage and minimum energy control

作者：Sun Zhe^*; Guo Chunlin; Xiao Xiangning; Xu Yonghai; Liu Yingying

来源：Proceedings of the CSEE, 2010, 30(31): 43-49.

• Analysis method
• Compensation strategy
• Dynamic voltage restorer (DVR)
• Minimum energy compensation
• Unbalanced loads
• Unbalanced voltages

The compensation strategy of the dynamic voltage restorer (DVR) has significant impact on the compensation result. A new analysis method based on pre-sag load voltage was proposed to overcome the shortcomings of the traditional method. The new method chooses the pre-sag load voltage phasor as the reference phasor and puts the centre of the limit compensation voltage circle at the terminal of the system voltage phasor. It has characteristics of both definite physical concept and convenient method in determining compensation range. Moreover, it has great advantages in analyzing the complicated voltage sag and unbalanced load as well. The basic theory and process of the new method was explained and compensation strategy of the three single-phase DVR which shares the common DC link was analyzed. Using the new method, the minimum energy compensation strategy was realized through the simulation when unbalanced voltage sag happened in the case of the unbalanced load. The conditions for zero active power compensation was also analyzed which could prolong the compensation time. The simulation result shows the correctness of the theoretical analysis. ? 2010 Chinese Society for Electrical Engineering.

• 出版日期2010
• 单位华北电力大学