Offshore wind power plant reactive power optimization compensation device and control method thereof

[0028] Embodiment 1 of the present invention is applicable to the topological structure of the reactive power optimization compensation device of the double-split main transformer of the offshore wind farm as follows: figure 1 shown, figure 1 in, i SA , i SB , i SC Send current to the high-voltage side of the main transformer of the double-split winding of the offshore booster station, where i SA1 , i SB1 , i SC1 with i SA2 , i SB2 , i SC2 are the three-phase winding currents connected in parallel on the high-voltage side of the double-split main transformer, i sa1 , i sb1 , i sc1 with i sa2 , i sb2 , i sc2 is the low-voltage side current of the double-split main transformer, i u1 , i v1 , i w1 with i u2 , i v2 , i w2 It is the current injected by the back-to-back MMC converter equipment into the two low-voltage winding taps of the double-split main transformer. The back-to-back MMC converter equipment consists of MMC converter 1, MMC converter 2, and DC voltag