A reactive power compensation configuration method and system for an offshore wind farm access system

Abstract

The invention relates to a reactive power compensation configuration method and system for an offshore wind farm access system, including: establishing a power grid data model including the offshore wind power access system; acquiring the overall inductive reactive power compensation demand and capacitive reactive power of the offshore wind farm Compensation requirements; analyze the power frequency overvoltage of the AC submarine cable under each preset ratio of both ends of the AC submarine cable corresponding to different parallel high-resistance configuration capacities, and determine the lower limit of the parallel high-resistance configuration capacity; only consider The compensation function of the parallel high reactance, when the voltage fluctuation rate of the grid connection point is less than the first preset threshold, according to the voltage fluctuation rate of the grid connection point and the voltage distribution state along the AC submarine cable under different parallel high reactance configuration capacity, determine the parallel connection The upper limit of the high-resistance configuration capacity; considering the fluctuation of wind power of the offshore wind power connection system and the requirement that the voltage fluctuation rate of the grid connection point is less than the second preset threshold, determine the dynamic reactive power configuration capacity; according to the reactive power balance, determine the low voltage The configuration capacity of the capacitor.

Description

technical field [0001] The present invention relates to the technical field of power systems, and more particularly, to a reactive power compensation configuration method and system for an offshore wind farm access system. Background technique [0002] At present, the main form of offshore wind power access is that the offshore wind farm is boosted and then connected to the onshore 220kV substation via the AC submarine cable. Compared with the overhead line, the AC submarine cable has higher charging power and the problem of power frequency overvoltage is more prominent. As the distance from the offshore wind farm increases, the length of the submarine cable continues to increase, resulting in a large surplus of charging power in the wind farm access system, and the reactive power cannot be balanced on the spot. The power frequency overvoltage problem seriously threatens the safe operation of the equipment. [0003] Therefore, it is necessary to configure reactive power comp...

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Problems solved by technology

[0004] The present invention proposes a reactive power compensation configuration method and system for an offshore wind farm access system to solve the problem of how to configure reactive power compensation for an offshore wind farm

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