Multi-terminal offshore direct-current wind power plant system

Abstract

The invention provides a multi-terminal offshore direct-current wind power plant system which comprises a three-layer structure including a basic power generation layer, a first boosting layer and a second boosting layer. The basic power generation layer is composed of a wind power generation unit and an alternating-current and direct-current converter connected with the power generation unit; thefirst boosting layer is composed of a direct-current transformer; the second boosting layer is composed of an offshore converter station; the alternating-current and direct-current converter is connected to a corresponding direct current transformer in the first boosting layer; and the DC transformer in the second layer is connected to the offshore converter station in the second boosting layer.According to the multi-terminal offshore direct-current wind power plant, a solution is provided for large-scale wind power plant construction, offshore wind power collection is carried out by using direct current so that cable loss in the wind power plant is reduced, repeated rectification, inversion and boosting of electric energy are avoided, system investment is reduced, and the load of the offshore platform is reduced.

Description

technical field [0001] The invention belongs to the technical field of power systems, and in particular relates to a multi-terminal offshore DC wind farm system. Background technique [0002] As a non-polluting and renewable new energy, wind energy has great development potential. Offshore wind farms have gradually become a new trend in the development of wind power due to their advantages such as stable wind speed, no occupation of land resources, and basically no environmental impact. As the latest technology of global wind power, offshore wind power has attracted much attention, and it is the new technology most likely to reduce the cost of wind power generation in the future. With the increase of installed capacity and transmission distance of offshore wind farms, the application of HVDC transmission technology in offshore wind power grid integration will become more and more extensive. [0003] The advantage of AC convergence combined with flexible DC transmission is ...

AI Technical Summary

Problems solved by technology

The series DC transmission scheme can omit the huge offshore converter platform, reduce the cost and construction difficulty, but its control and protection strategy is relatively complicated, and the fan transformer needs to withstand the insulation voltage level of high-voltage DC, which must increase the difficulty of manufacturing. There is no actual project yet , related technical bottlenecks need to be broken through

Images