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Method for controlling voltage reactive variables of high-voltage power grid transformer substation

A voltage reactive power and control method technology, applied in reactive power compensation, reactive power adjustment/elimination/compensation, etc., can solve the problem of simple area division and control method, mismatched reactive power and voltage control conditions, and no consideration of active power The influence of voltage and reactive power control range and other issues

Active Publication Date: 2014-07-30
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The nine-zone diagram is based on the most basic relationship algorithm between the voltage and reactive power on both sides of the transformer. It has the advantages of simple relationship and clear purpose. The power grid operation control conditions are determined, so the reactive power control range of the substation should be determined according to the voltage control range. (2) The nine-area diagram does not consider the mutual influence of the relationship between voltage and reactive power changes, and the area division and control method are too simple, which may easily cause reciprocating action
Due to the increase or decrease of the voltage after switching the capacitor / reactor, the operating point moves to another unsatisfied area, which is a prominent problem in the current nine-zone diagram algorithm; (3) The control of active power on voltage and reactive power is not considered range of impact

Method used

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  • Method for controlling voltage reactive variables of high-voltage power grid transformer substation
  • Method for controlling voltage reactive variables of high-voltage power grid transformer substation
  • Method for controlling voltage reactive variables of high-voltage power grid transformer substation

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0159] Embodiment of the relationship between the substation voltage and reactive variables in step D:

[0160] Table 1 is the grid simulation calculation results of voltage and reactive power of transformers under the condition of different active power transmission in UHV substations and the calculation results of applying expression (9), where, in expression (9), U 2 and Q 1 Using the simulation results, U 1 The calculated value of expression (9) is compared with the simulation calculated results. It can be seen from the table that when the transformer load is large, ignoring the influence of active power will cause a certain deviation in the calculation result of expression (9); using the coefficient K correction can make the calculation result closer to the program simulation result.

[0161] Table 1 Comparison of calculation results of substation voltage and reactive power formulas with simulation results

[0162]

[0163] In the embodiment, according to the above ...

Embodiment 2

[0168] Embodiment of the judgment value range of the voltage and reactive power control strategy of the substation in step E:

[0169] In the embodiment, the voltage control ranges of the high-voltage side and the medium-voltage side of the substation are stipulated as follows during power grid operation:

[0170] High voltage side U 1 : 0.952p.u.~1.029p.u.

[0171] Medium pressure side U 2 : 0.971p.u.~0.996p.u.

[0172] Reactive power Q is obtained from expressions (10)~(13) 1 The control range of is shown in Table 3:

[0173] Table 3 Calculation results of reactive power control threshold in substation

[0174]

[0175] In the embodiment, the control requirements of reactive power stratification and partition are not proposed, so it is not considered with control threshold.

[0176] According to the simulation calculation results, it is determined that the low-voltage reactive power compensation equipment switching 1 group causes the voltage and reactive power o...

Embodiment 3

[0182] Embodiment of substation voltage and reactive power control strategy in step F:

[0183] Table 4 shows the simulation calculation results for verifying the voltage and reactive power control strategy in the thirteen-area diagram of the present invention by performing the switching operation of the low-voltage reactive power compensation equipment of the UHV substation under different voltage and reactive power conditions. The simulation calculation results show that the voltage and reactive power control strategy of the thirteen-area diagram in the present invention can accurately adjust the voltage and reactive power of the substation within the control range, and avoid repeated switching of reactive power compensation equipment.

[0184] Table 4 Simulation calculation results of substation voltage and reactive power control strategy

[0185]

[0186] The method for controlling the voltage and reactive power variable of a high-voltage power grid substation provided ...

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Abstract

The invention belongs to the technical field of voltage and reactive control for an electric system and particularly relates to a method for controlling voltage reactive variables of a high-voltage power grid transformer substation. The method comprises the following steps of: A, determining an application condition of a transformer element; B, establishing a mathematical model for the transformer element; C, taking a mathematical expression reduction result from the mathematical model; D, determining the voltage reactive variables of the transformer substation and calculating the relationship among the reactive variables; E, determining a control range of the voltage reactive variables of the transformer substation; and F, providing a control strategy for the voltage reactive variables of the transformer substation. The control method disclosed by the invention has the advantages of strong operability, complete consideration and rational scheme and has high practical value and good market prospect.

Description

technical field [0001] The invention belongs to the technical field of power system voltage and reactive power control, and in particular relates to a method for controlling the voltage and reactive power variable of a high-voltage power grid substation. Background technique [0002] The traditional substation voltage and reactive power control strategy mainly divides the relationship between voltage and reactive power into nine areas (i.e. nine area diagrams). When the substation voltage and reactive power enter different areas, it will be automatically or manually based on the established control strategy. Regulation control of reactive equipment. [0003] The nine-zone diagram is based on the most basic relationship algorithm between the voltage and reactive power on both sides of the transformer. It has the advantages of simple relationship and clear purpose. The power grid operation control conditions are determined, so the reactive power control range of the substatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/18
CPCY02E40/30
Inventor 吴丽华王青李再华侯雪李晓珺陈得治
Owner STATE GRID CORP OF CHINA
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