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Pilot node selecting method based on wind electric power fluctuation probability characters

A technology of wind power fluctuations and dominant nodes, applied in wind power generation, single-network parallel feed arrangement, etc., can solve the problem that the dominant node cannot reflect the representativeness of regional voltage

Inactive Publication Date: 2013-07-24
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These factors lead to the dynamic migration of the electrical distance center in the control area or the typical representative node of the regional voltage level as the power flow changes. For example, the dominant node cannot reflect the representative regional voltage in all operating states according to the original selection method.

Method used

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  • Pilot node selecting method based on wind electric power fluctuation probability characters
  • Pilot node selecting method based on wind electric power fluctuation probability characters
  • Pilot node selecting method based on wind electric power fluctuation probability characters

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] Embodiment 1: IEEE3 machine 9 node system calculation example.

[0073] Replace node 3 in the IEEE3 machine 9-node system with a wind farm, the system structure is as follows figure 2 shown.

[0074] Table 1 Active load table of each node under peak, waist and valley loads. The peak, waist and valley typical load per unit values ​​of nodes 5, 6 and 8 are shown in Table 1. The power factor is 0.98. The rated capacity of wind power is 30% of the total load in the maximum load mode.

[0075] Table 1

[0076]

[0077] According to the measured data of a wind field in Shandong Power Grid, the injected power is calculated according to the power interval of 10% of the rated capacity of the wind field, and the probability distribution of the peak and mid-valley load periods is shown in Table 2. Probability distribution table. Because there is only one random variable, the probability of the random operation state of the system is the same as that in Table 2. The pea...

Embodiment 2

[0089] Embodiment 2: Calculation example of New England39 node test system.

[0090] The structure of the New England39 node system is as follows: image 3 shown.

[0091] The initial load of each node is regarded as the valley load operating state, and all multiplied by the proportional coefficients 1.3 and 1.7 to form the waist load and peak load operating states. Randomly select nodes 2, 7 and 16 to connect to the wind farm. The injected power of each wind field adopts the same historical data as the calculation example in 3.1, and the rated capacity of each wind field is set at 12% of the total peak load active power.

[0092] If the power interval of the calculation example in Embodiment 1 is followed, the total number of random states of the system is 3×9×9×9=2187, which brings a large amount of calculation for subsequent optimization calculations. In order to control the number of random operating states, the power interval is 50%, that is, the injected power of the ...

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Abstract

The invention provides a pilot node selecting method based on wind electric power fluctuation probability characters. Due to the fact that large-scale renewable energy resources are merged into a control area, Fluctuations and trends of currents are changed greatly, and many challenges are brought to area voltage reactive power control. Pilot nods are as primary goals of secondary voltages, when the pilot nods are selected, access of renewable energy resources needed to be considered. According to the pilot node selecting method based on the wind electric power fluctuation probability characters, access of wind power is as an example, statistics of power injection probability distribution characters of a wind power plant in different periods is carried out, various system random working states with different probabilities are formed through superposition of the power injection probability distribution characters and load working modes of peaks, waists and valleys of a system, selected pilot nodes satisfy that after the system is subject to random disturbance, voltage deviation expectation of the rest load nodes in the whole net is made to be minimum under various random working states through control and elimination of voltage deviations of the selected pilot nodes. Feasibility and validity of the pilot node selecting method based on the wind electric power fluctuation probability characters are verified by IEEE three-machine-nine-node system simulation results and New England 39-node system simulation results.

Description

technical field [0001] The invention relates to a method for selecting a dominant node based on the probability characteristic of wind power fluctuation. Background technique [0002] The secondary voltage control is an important link in the automatic voltage control system, and maintaining the dominant node voltage is its primary control goal. Therefore, the selection of the dominant node is directly related to the effect of secondary voltage control on organizing and coordinating regional reactive power resources and maintaining regional voltage levels. The dominant node selection method is from the initial selection of the load node with the largest electrical distance center or short-circuit capacity based on the electrical distance (see reference 1), to the use of offline optimization methods to determine the voltage deviation of other nodes after eliminating disturbance deviations in the control area From the smallest node (see references 2-4), to the recent optimizat...

Claims

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Application Information

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IPC IPC(8): H02J3/38
CPCY02E10/763Y02E10/76
Inventor 贠志皓刘玉田梁军王洪涛
Owner SHANDONG UNIV
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