Quick load shedding is a common measure for power systems to remain stable after a fault. In this paper

a DC microgrid load shedding decision-making method based on on-line load sensitivity identification is proposed for the DC microgrid with power electronics transformer（PET） as its core. Firstly

the voltage of PET DC terminal

is controlled to realize the on-line load sensitivity identification

and to obtain the real-time sensitivity of load power to the voltage change; then

the load characteristic parameters are applied to the voltage droop control curve of DC microgrid’s voltage regulating units

so as to accurately evaluate the influence of the load removal on the DC voltage and to quickly determine the load removal sequence. At last

a DC microgrid that includes wind/light microsources

energy storage

and various characteristic loads is established on Matlab/Simulink

and the cut-off load is determined according to the proposed voltage evaluation formula considering load sensitivity when the AC main grid side is faulty or the distributed power output is limited and the DC voltage is lower than the droop voltage regulation range. Then the system DC bus voltage and the operating modes of voltage regulating unit can be operated according to the theoretically determined value

which verifies the effectiveness of the proposed method. In addition

this method overcomes the problems of the load time-varying

and has the characteristics of simple principle and convenient calculation.