Modular direct-current grid connection topology comprising energy storing device for wind power station group

Abstract

The invention discloses a modular direct-current grid connection topology comprising an energy storing device for a wind power station group. The modular direct-current grid connection topology comprises a first convertor station, a second convertor station and a third convertor station, wherein the first convertor station is positioned near the wind power station group; the alternating-current bus end of the first convertor station is connected with a wind power station; the alternating-current bus end of the second convertor station is connected with the energy storing device; the direct-current bus end of the second convertor station is connected with the first convertor station through a direct-current bus; the alternating-current bus end of the third convertor station is connected with a receiving end power grid; the direct-current bus end of the third convertor station is connected to the direct-current bus; the first convertor station is used for transmitting power of each wind power station to the direct-current bus; the third convertor station is used for controlling the voltage of the direct-current bus to be constant, and transmitting power emitted by each wind power station to the receiving end power grid; and the energy storing device is used for absorbing or transmitting power to stabilize the fluctuation of the wind power. The wind power stations in the system are not in alternating-current interconnection with a local power grid or other wind power stations, so that the influence range of an alternating-current fault can be limited, the wind power short fluctuation can be stabilized, and the system stability can be improved.

Description

technical field [0001] The invention belongs to the technical field of electric power system transmission, and in particular relates to the grid-connected topology of multiple wind farms and energy storage systems in the form of DC modules. Background technique [0002] In recent years, my country's wind power generation has developed very rapidly, and its installed capacity reached 44.73 million kilowatts at the end of 2010, surpassing the United States to become the country with the largest wind power installed capacity in the world. However, it is worth noting that the seven 10-million-kilowatt-level wind power bases planned in my country—Hami, Jiuquan, Hebei, Jilin, Jiangsu Coastal, Eastern Mongolia, and Western Mongolia—are mostly located at the end of the power grid, and the local electricity load Low self-absorbing capacity, weak self-absorbing capacity, and the reverse distribution of wind energy resources and load centers determine that most wind power generation nee...

AI Technical Summary

Problems solved by technology

This topology is aimed at the transmission of offshore wind power to land through DC cables, and considers the cost of offshore wind power construction. This topology does not consider energy storage devices

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