Reactive power control method and reactive power control system for wind farm clusters

Abstract

The invention discloses a reactive power control method and a reactive power control system for wind farm clusters. The method comprises the following steps: a wind farm cluster control device extracts the target grid-connection point voltage of each wind farm in a wind farm cluster from a voltage instruction issued by a dispatching center; the wind farm cluster control device detects a preset range to which the current grid-connection point voltage uploaded by each wind farm belongs; if the current grid-connection point voltage uploaded by any wind farm is within a normal operation range, the AVC substation of the wind farm enters a local control mode under control; if the current grid-connection point voltage uploaded by any wind farm is within an abnormal operation range, the AVC substation of the wind farm enters a coordinated control mode under control, a coordinated AVC substation is chosen from the wind farm cluster according to the sensitivity of reactive voltage and the reactive power adjustable capacity of each wind farm to assist in making the grid-connection point voltage of the wind farm in a coordinated control mode achieve the target voltage; and if the current grid-connection point voltage uploaded by any wind farm is within an emergency operation range, the AVC substation of the wind farm enters an emergency control mode under control, and the grid-connection point voltage of the wind farm is controlled through generator tripping, load shedding or wind farm cutting-off.

Description

technical field [0001] The invention relates to the technical field of wind farm cluster control, in particular to a reactive power control method and system for a wind farm cluster. Background technique [0002] At present, due to the influence of the view of in-situ reactive power layered balance, most of the research on wind farms at home and abroad focuses on the optimal control of reactive power and voltage of a single wind farm, considering the coordination and cooperation between similar wind farms. There are relatively few studies. [0003] my country's wind farms are often built in a concentrated manner, forming large-scale wind farm clusters. Multiple wind farms are connected to the same substation to form a wind farm cluster, which brings difficulties to the dispatching department. In terms of reactive power, due to the volatility of wind power, strong Affects regional voltage levels. [0004] In areas with many wind farms, for this kind of wind farm clusters tha...

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Problems solved by technology

[0004] In areas with many wind farms, for this kind of wind farm clusters that are geographically adjacent, have the same characteristics and are connected to the same substation, the reactive power and voltage control mode with wind farms as the basic unit and local compensation is not optimal Yes, the way of adjusting reactive power and voltage by a single wind farm alone cannot meet the requirements of the power grid, which will make the distribution of reactive power in the region inappropriate, and the overall voltage level of the region will drop

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