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

A technology of wind farm group and distribution method, which is applied in the directions of reactive power compensation, reactive power adjustment/elimination/compensation, wind power generation, etc., and can solve the problem of large central node voltage regulation, large reactive power compensation, and lack of wind farm regulation. Cooperation and other issues

Active Publication Date: 2013-01-02
STATE GRID ELECTRIC POWER RES INST +1
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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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  • Electric principle-based wind power plant cluster reactive power sharing method
  • Electric principle-based wind power plant cluster reactive power sharing method
  • Electric principle-based wind power plant cluster reactive power sharing method

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[0074] The invention is used for reactive power control of a wind farm group including multiple wind farm areas. The system is an actual regional power grid including wind power in China. It contains 3 wind farms with wiring like Figure 4 shown. The three wind farms are connected to the main network through the same access point. Among them, the total installed capacity of wind farms 1 and 3 are both 200MW, consisting of 134 double-fed wind turbines with a single capacity of 1.5MW, and the total installed capacity of wind farm 2 is 100MW, composed of 67 double-fed wind turbines with a single capacity Composed of wind turbines, the power factor range of the three wind farms during rated operation is -0.95 to +0.95, and the reference voltage of the central node is 220kV. According to the relevant wind farm operation guidelines, when the wind farm is operating under non-rated conditions, its power factor should be variable within the range of -0.835 to +0.835. figure 1 , f...

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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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/18
CPCY02E10/763Y02E40/30Y02E10/76
Inventor 陈宁石磊包海龙刘隽
Owner STATE GRID ELECTRIC POWER RES INST
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