Distributed double-fed wind power generation system and voltage adaptability control method

The invention provides a distributed doubly-fed wind power generation system and a voltage adaptability control method, in the system, a nine-switch converter is connected between a doubly-fed wind power generator set and a common connection point, an upper channel in two groups of three-phase output ends of the nine-switch converter outputs a first voltage uvc for voltage compensation, and a lower channel in two groups of three-phase output ends of the nine-switch converter outputs a second voltage uvc for voltage compensation; the lower channel outputs a second voltage ucc for current compensation; the upper channel is connected to a double-fed wind generating set side line through an LC filter and a series transformer in sequence, and the lower channel is connected to a common connection point side line in parallel after passing through a filter reactor; when the voltage of the power grid is within a preset normal working range, the series transformer is in short circuit by the bypass switch; and when the