Multi-terminal offshore wind power flexible direct current and energy storage cooperative grid-connected system and control method thereof

Abstract

The invention discloses a multi-terminal offshore wind power flexible direct current and energy storage cooperative grid-connected system. The system comprises a plurality of offshore wind power clusters, a plurality of offshore converter stations connected in parallel, and land converter stations connected with the offshore converter stations. Each offshore converter station is directly connected with the output end of the corresponding offshore wind power cluster, and the direct current output ends of the offshore converter stations are connected in parallel; the land converter stations are connected to the AC main power grid; the energy storage subsystem is connected with the land converter station, comprises a plurality of energy storage units and is used for stabilizing offshore wind power output fluctuation; and the invention further discloses a corresponding control method. The branch type multi-terminal offshore wind power flexible direct-current power transmission subsystem integrates a plurality of dispersedly distributed offshore wind power clusters, shares a seabed transmission corridor and an onshore converter station, is connected with the energy storage subsystem at the onshore converter station, saves the seabed transmission corridor and landing point resources, reduces the network loss of a current collection system, smoothes the wind power output, and improving the flexibility, stability and reliability of offshore wind power generation.

Description

technical field [0001] The invention belongs to the field of offshore wind power control, and in particular relates to a multi-terminal offshore wind power flexible direct current and energy storage coordinated grid connection system and a control method thereof. Background technique [0002] With the continuous development of my country's offshore wind power resources, offshore wind power will inevitably go to the deep sea. Flexible DC transmission is one of the most important technical routes for offshore wind power transmission, and has been widely used in Europe. However, the cost of offshore wind power flexible direct current transmission projects is still relatively high. If each offshore wind farm adopts flexible direct current transmission technology, there will be multiple parallel offshore wind power flexible direct current projects, and the investment will be huge. At the same time, the submarine corridors of multiple offshore wind power transmission lines take u...

AI Technical Summary

Problems solved by technology

If the balance between the load growth rate and the growth rate of new energy installed capacity and the construction of outbound transmission channels cannot be guaranteed, and the external power does not participate in peak shaving, it will cause a peak shaving gap in the AC main network; the volatility and randomness of offshore wind power will also aggravate the problem of wind curtailment

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