Multi-inverter parallel control method and system based on improved droop control

The invention discloses a multi-inverter parallel control method and system based on improved droop control, and the method comprises the steps: collecting the data of a microgrid system, and calculating the voltage range of the system; the slope is changed by improving droop control, and the system voltage is adjusted; and compensation is carried out through adaptive virtual impedance, line impedance difference is eliminated, and uniform distribution of reactive power is realized. According to the method, the variable slope droop curve and the translation droop curve are combined, the system voltage can be adjusted without errors in the power balance state, the power change can be quickly responded, and the voltage is prevented from greatly changing and exceeding the limited range. The self-adaptive virtual impedance is added, self-adaptive adjustment is carried out along with the change of a load power factor, the voltage drop difference can be eliminated, and therefore reasonable distribution of reactive p