Electric principle-based wind power plant cluster reactive power sharing method

Abstract

The invention provides an electric principle-based wind power plant cluster reactive power sharing method. The method comprises the following steps: calculating real-time voltage of hubs; calculating voltage difference of the hubs; calculating the reactive power demand quantity of the hubs; calculating equivalent electric impedance of the wind powder plant from the wind plant to the hubs according to regional tidal stream information and wind power plant access circuit parameters; calculating the reactive sharing quantity of the wind power plant; and sending a reactive adjusting command to a wind power plant monitoring system to enter the next control. In the method, the hub voltage in the wind power plant access region is used as a regulating object, the actual condition of the wind power plant access region is concerned, and local region operation information is utilized so that equivalence is performed to the impedance of a wind power plant power passing circuit according to the basic electric principle; the reactive power is optimized by using the minimum active power loss of the access region as a target to ensure that the power grid operation and economic benefit of reactivepower adjustment are concerned while the wind power plant cluster provides reactive power support, and the reactive power coordinating distribution control of the wind power plant cluster can be improved conveniently.

Description

technical field [0001] The invention relates to an electrical principle distribution method for realizing reactive power distribution of wind farm groups, and belongs to the technical field of reactive power control of wind farms in new energy power generation technology. Background technique [0002] As one of the most promising new energy technologies for large-scale development and commercialization, wind power has attracted more and more attention from various countries. The centralized connection of large-scale clustered wind farms to the power grid is the main application mode of wind power generation in my country. The most direct impact of wind farm access on the power grid is the voltage and reactive power problems at the access point, including voltage fluctuations and flicker caused by changes in wind force, excessive voltage amplitudes and unqualified power factors caused by changes in working conditions. [0003] With the development of wind power, there are us...

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Problems solved by technology

However, when using this method for autonomous control of each wind farm, when the central node voltage fluctuates, the regulation of each wind farm lacks coordination. At this time, the voltage support generated by reactive power compensation is the superposition of the reactive power output of each wind farm to the central node voltage support, so , it may make the amount of reactive power compensation too large, resulting in excessive adjustment of the central node voltage

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