The invention discloses an island 
microgrid voltage and frequency adjustment method and 
system. The method comprises the steps of collecting variable information through a distributed 
information processor, carrying out the data interaction and iterative calculation with a nearest adjacent node, and obtaining an average 
voltage deviation value and an average 
frequency deviation value; obtaining avoltage adjustment quantity and a frequency adjustment quantity through a secondary coordination controller; and adjusting the 
voltage and frequency of the island 
microgrid to stable operation throughdroop control by a primary stability controller. According to the scheme, the 
distributed information processing module only needs to perform information interaction with the nearest adjacent node onthe variable information, so that the complexity of 
processing the variable information of the source network load 
system is greatly reduced, and the operation burden is reduced; data interaction iscarried out on variable information of local nodes and neighbor nodes, the average voltage deviation and the average 
frequency deviation are directly obtained after iteration, the voltage and frequency adjustment quantity does not need to be calculated by collecting 
impedance parameters and constant-
power load information of the 
system, and the method has the advantages of being small in amount ofcollected information and simple in calculation process.