OFFSHORE WIND FARM LOW-FREQUENCY ALTERNATING-CURRENT UNCONTROLLED RECTIFICATION ELECTRIC POWER TRANSMISSION SYSTEM

摘要

Disclosed in the present invention is an offshore wind farm low-frequency alternating-current uncontrolled rectification electric power transmission system, comprising an onshore converter station and an offshore alternating-current system. The offshore alternating-current system comprises a wind turbine generator, an alternating-current submarine cable, a bus bar, and an offshore booster station; the onshore converter station comprises a wind field side alternating-current bus, an alternating-current system side alternating-current bus, an alternating-current filter, an energy consumption device, a rectifier, and a converter; the rectifier is composed of a three-phase six-pulse uncontrolled rectifier bridge, and the converter may be an MMC or an LCC; the rated frequency of the offshore alternating-current system is selected to be close to 10 Hz. Compared with a conventional flexible direct current transmission solution, in the present invention, the high technical maturity of an alternating-current transmission solution is fully used; and the economic electric power transmission length of the alternating-current submarine cable is increased by reducing the rated frequency of the offshore alternating-current system, and an offshore converter station and an onshore converter station are combined into a new onshore converter station, so that the use of an offshore platform can be reduced, the construction cost can be greatly reduced, and the system has a huge application value in actual engineering.