Fault ride-through control system of offshore wind power series grid connection and control method thereof

The present invention relates to a fault ride-through control system of offshore wind power series grid connection and a control method thereof. The control system comprises a DC fan, an energy storage unit which is connected to the DC fan in series, an auxiliary power loop, an output inductor, a current detection unit, a voltage detection unit and a controller. The current detection unit is used for detecting the current of the system. The voltage detection unit is used for detecting the voltage of the system. According to the controller, the low voltage ride-through of the system is realized in the needed condition according to the detected current and voltage. The auxiliary power loop is used for regulating the output voltage of the controller such that the output power of the DC fan is stored in the energy storage unit. The output inductor is used for filtering the output voltage of the DC fan. According to the technical scheme of the invention, the offshore wind power low voltage fault ride-through ability requirement is satisfied, and the reliability of an offshore wind power system is improved.