A non-linearity state observer-based distributed voltage control method for a microgrid, comprising the following steps: step 10): building a large-signal model for each distributed power supply, a connection network and an impedance load in a microgrid; step 20): building a Luenberger non-linearity state observer for each distributed power supply; step 30): estimating dynamic characteristics of other distributed power supplies in real time according to a local measurement value of each distributed power supply; and step 40): achieving distributed voltage control of the microgrid on the basis of control requirements for reactive power sharing and voltage recovery. Said control method achieves distributed state observer-based voltage control of a microgrid and does not depend on communication transmission and remote measurement, thus the unfavorable influence of communication delay and data package dropout on control performance is avoided, and control stability and dynamic performance are thus effectively improved.
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