Topological structure, grid-connected system and control method of offshore wind power plant

The invention discloses a topological structure, a grid-connected system and a control method of an offshore wind power plant; the offshore wind power plant comprises an N blowers and (N-1) sets of shunt circuits; the DC (Direct Current) output ends of the N blowers are connected in series in sequence; starting from the first one of the blowers connected in series, each two blowers are used one blower group, that is, the nth blower and the (n+1)th blower are utilized as one blower group, wherein N ranges from 1 to N-1; each blower group is connected in parallel with one set of the shunt circuit; the control method comprises the steps: when the port voltage of the previous blower of the blower group is lower than a rated voltage, controlling the shunt circuit to inject negative current to the blower group; when the port voltage of the previous blower of the blower group is higher than the rated voltage, controlling the shunt circuit to inject positive current to the blower group. Each blower is capable of independently finishing maximum-power tracking, and an offshore converter station and an offshore electric platform are cancelled; the construction of an offshore wind power generation system is reduced and the total energy loss of the system is reduced.