Integrated offshore wind electric field fault ride-through method based on HVAC grid connected

Abstract

The invention discloses an integrated offshore wind electric field fault ride-through method based on HVAC grid connected. The method comprises steps that 1), reactive demands under fault ride-throughconditions is calculated; 2), a reactive output limit of each set and a real-time reactive output limit of the whole offshore wind electric field set are calculated; 3), in a low voltage ride-throughcontrol mode, a dynamic reactive power compensator is cooperated by the wind electric field set to carry out layered capacitive reactive support; 4), in a low voltage ride-through continuity period,early removal of a crowbar circuit is considered, stator side reactive output capability of the set is recovered; 5), for the set of which a rotor transverter is under control and a reactive injectioncurrent can not satisfy requirements in the low voltage ride-through continuity period, through limiting output of active power, reactive output capability is enhanced; and 6), in a high voltage ride-through control mode, the dynamic reactive power compensator is cooperated by the wind electric field set to carry out layered sensitive reactive support. The method is advantaged in that offshore wind electric field fault ride-through capability is effectively improved.

Description

technical field [0001] The invention relates to a comprehensive fault ride-through method for offshore wind farms based on HVAC grid connection, and belongs to the technical field of offshore wind power generation. Background technique [0002] As the proportion of wind power grid-connected capacity in the power system continues to increase, the impact of wind power failure off-grid on the safe operation of the power grid is becoming more and more serious. Because the development scale of offshore wind farms is much larger than that of land wind farms, it is a hot spot in wind power technology research at the present stage. However, the research on the control method of its fault disconnection still uses the related technologies of onshore wind farms. Considering the actual conditions such as investment and cost, at present, most of my country's offshore wind power adopts the high-voltage AC networking (HVAC) method, which has the advantages of large submarine cable charging...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problem that the HVAC grid-connected offshore wind farms in actual engineering cannot give full play to the reactive power adjustment capability of the on-site units and coordinate the reactive power support of the wind farm units and reactive power compensation devices during the low-voltage ride-through and high-voltage ride-through processes, this paper The invention provides a comprehensive fault ride-through method for offshore wind farms based on HVAC grid connection

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