HUANG Gui\|gen, WANG Teng\|fei, WANG Hui\|xin, MA Kai\|li, WANG Zheng\|shi

(College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China)

 

Abstract: Aiming at realizing load current sharing of dc micro grid, static current sharing, dynamic current sharing, dc bus voltage regulation and common current–sharing methods were researched, and the adaptive droop based on low bandwidth communication was proposed. In order to overcome the limitations of traditional droop control and to achieve excellent dynamic current sharing performance, two regulators were added, with a current regulator to fine netune droop coefficient and a voltage regulator to adjust voltage set point. Control was done locally without center controller, which was of high reliability. Comparative experiments of different control methods were presented. The results indicate that static current error is smaller than 3% and dynamic current error is smaller than 4%. The proposed control method can effectively realize load current sharing and restore the dc bus voltage.

 

Key words: DC micro grid; adaptive droop control; dynamic current sharing; CAN communication