Adaptive droop control method and system based on power margin

The invention discloses a self-adaptive droop control method and system based on power margin, and the method comprises the steps: collecting the data of a power transmission system, and calculating the voltage deviation caused by UI control; improving droop control based on the power margin ratio, and calculating a droop coefficient; the droop coefficient is adjusted according to fluctuation conditions of bus voltage and power, and accurate distribution of the power is achieved. On the basis of traditional droop control, a method for designing a variable droop coefficient based on the power margin ratio between converter stations is provided, and meanwhile the influence of line resistance is considered. Setting a direct-current bus voltage change fixed quantity, judging whether to change a droop coefficient or not by comparing the actual voltage change quantity, and adding a control link of translating a droop curve to ensure that the fluctuation voltage of the direct-current bus within the fixed quantity is