Control method of micro-grid bidirectional DC/DC (Direct Current/Direct Current) change drooping coefficient

The invention discloses a control method of a micro-grid bidirectional DC/DC (Direct Current/Direct Current) change drooping coefficient. The method comprises the following steps: detecting direct current bus voltage Udc and direct current bus current Idc on an output side; inputting the Udc, the Idc, a direct current bus voltage set value Udc and a drooping coefficient initial value k0 into a direct current bus drooping controller; comparing the direct current bus voltage Udc with the direct current bus voltage set value Udc to determine a DC/DC working region and regulating the drooping coefficient of each region; calculating a DC/DC output voltage reference value Udc-ref; transmitting a difference value of the DC/DC output voltage reference value Udc-ref and the direct current bus voltage Udc into a direct current voltage PI (Proportional Integral) regulator, and outputting a given value Idc of a current ring; comparing the Idc with the direct current bus current Idc, inputting the difference value into the direct current PI regulator, and taking the output as a given value of PWM (Pulse Width Modulation); generating PWM wave for controlling switch-on and switch-off of an IGBT (Insulated Gate Bipolar Transistor) to realize constant voltage control of DC/DC. The problem that the DC/DC output power cannot be regulated on line in the drooping control is effectively solved, the dynamic performance and the steady state performance of a direct current converging system are improved, and loop current between energy storage units is reduced.