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The traditional phase-locked control technology seriously limits the upper and lower limits of the phase parameters of the inverter''s power grid signals. To solve the above problems, a new synchronous phase-locked control technology based on intelligent high voltage grid inverter is proposed. By selecting the high voltage switch device, the power grid data acquisition circuit is perfected to achieve the purpose of the modulation intelligent PI inverter organization, and the structure type of the intelligent high voltage grid inverter is completed. On this basis, by determining the synchronous response performance and intelligent control index of the PLL, the digital control process of the loop is perfected to complete the research of the digital synchronous phase locked control technology of the intelligent high voltage power grid inverter. The experimental results show that the upper limit of the phase parameters of the power grid signals is up to about 15×107T and the lower limit is about 16×107T, compared with the traditional technology.