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Method for designing coordinate amount among automatic voltage control systems of power grid and implementing method thereof

An automatic voltage and control system technology, applied in the direction of AC network voltage adjustment, electrical components, circuit devices, etc., can solve problems such as control oscillation and unbalanced reactive power reserve

Inactive Publication Date: 2011-01-12
NORTHEAST CHINA GRID +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using gate voltage or gate reactive power as coordinating variables still has problems of control oscillation and unbalanced reactive power reserve. Therefore, an index is needed to distinguish whether reactive power disturbance occurs in this area or adjacent areas, and to measure the impact of control actions in this area on adjacent areas. Direction and magnitude of area reactive power influence

Method used

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  • Method for designing coordinate amount among automatic voltage control systems of power grid and implementing method thereof
  • Method for designing coordinate amount among automatic voltage control systems of power grid and implementing method thereof
  • Method for designing coordinate amount among automatic voltage control systems of power grid and implementing method thereof

Examples

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Effect test

example 1

[0157] Setup: New England 10-machine 39-node system divided into 6 automatic voltage control zones (eg figure 2 ). The key node of each region ("critical node" is also called "pilot node", which is a term in automatic voltage control. Generally, the voltage of the key node is controlled near a given set value, which can make the region where the key node is located. The voltage level is maintained at a good level) and the controllable generator number is shown in Table 1 below. Among them, the reactive power upper limit of all generators is 300MVar. The reactive power and voltage at the boundary nodes are set as the initial power flow results, ie the initial steady state values.

[0158] Table 1

[0159] control area

key node

controllable generator

1

1

39

2

28

38

3

6

31，32

4

3

30，37

5

19

33，34

6

23

35，36

[0160] Disturbance situation: The re...

example 2

[0163] Setting: In scheme A, all 6 areas are equipped with secondary voltage control devices, but there is no coordination; in scheme B, 6 areas are also equipped with secondary voltage control devices, but use VACE as the coordination quantity, that is, formula (8) Add constraints where the reactive power and voltage at the boundary nodes are the initial power flow results.

[0164] Disturbance situation: In the 14th control period, the load consumption connected to the node 24 suddenly increases by 200MVar.

[0165] Simulation results: Figure 4 What is given is the change curve of the voltage amplitude of the critical node 19 . After adopting VACE as the coordination quantity, the oscillations subsided quickly. Figure 5 The curve in , shows that when VACE coordination is not employed, the generator reactive power oscillates several times before reaching steady state. It can be seen that the control oscillation can be suppressed by using VACE to coordinate automatic volt...

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Abstract

The invention relates to the technical field of automatic voltage control of power systems, in particular to a method for designing coordinate amount among automatic voltage control systems of a power grid and an implementing method thereof. The coordinate amount represents the voltage areal control deviation and consists of boundary node voltages among the automatic voltage control systems in different area and on different levels and weighted sum of reactive disturbance injected into a local area from foreign areas. In the invention, whether reactive disturbance occurs in or out the area can be determined through the coordinate amount, the direction and size of the reactive influences on neighboring areas of the control action of the local area are measured, each control area only responds for the reactive disturbance in the local area, and the examination is fair; and thus, the areal control responsibility is clear, coupling is reduced and coordinate control can be realized.

Description

technical field [0001] The invention relates to the technical field of automatic voltage control of power systems, in particular to a method for designing coordination quantities between automatic voltage control systems of different regions and different levels of power grids in a power system and an implementation method thereof. Background technique [0002] The Automatic Voltage Control (AVC) system has been widely used in regional power grids at home and abroad, and has achieved ideal results in optimizing voltage quality, improving system safety, reducing network losses, and reducing dispatcher labor intensity. The currently implemented AVC systems are often controlled independently for the area under their jurisdiction. The design considers that the reactive power coupling of adjacent areas or power grids of different levels is weak, and the coordination between AVC systems is not considered. [0003] However, with the development of the power system, the number of co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00H02J3/04H02J3/16
CPCY02E40/34Y02E40/30
Inventor 王钢梅生伟苏辛一张雪敏陶家琪何光宇贾伟高德宾刘家庆孟令愚侯凯元杨宁李泽宇邵广惠徐兴伟马新彭晓洁郗郅夏德明岳涵
Owner NORTHEAST CHINA GRID
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