CN107894544B - A kind of localization method of region direct-current ground potential fluctuation sources - Google Patents
A kind of localization method of region direct-current ground potential fluctuation sources Download PDFInfo
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- CN107894544B CN107894544B CN201711137612.5A CN201711137612A CN107894544B CN 107894544 B CN107894544 B CN 107894544B CN 201711137612 A CN201711137612 A CN 201711137612A CN 107894544 B CN107894544 B CN 107894544B
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- current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/001—Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing
Abstract
The present invention provides a kind of localization method of region direct-current ground potential fluctuation sources；This method obtains all grounded neutral DC current size and Orientations of regional power grid according to regional exchange electricity grid substation grounded neutral DC System Monitoring；Fluctuation sources sense of current is determined according to the direction of the substation transformer neutral point current of edge placements several in regional exchange power grid, i.e. fluctuation sources current direction is identical as the neutral point current direction of edge substation.If there is the edge substation situation contrary with fluctuation sources, then using the region as fluctuation source region；Under the rail traffic method of operation based on existing transformer dc current monitoring data, network DC current parameters and ground resistivity parameter are considered；It show that substation's neutral point direct current is distributed in fluctuation source region machine setting fluctuation source position and size then in conjunction with substation's geographical location information, and compare with measurement result, fluctuation sources size and location is adjusted, until error is met the requirements.
Description
Technical field
The present invention relates to T & D Technology fields, more particularly, to a kind of positioning of region direct-current ground potential fluctuation sources
Method.
Background technique
Nearest is multinomial the study found that magnetic storm, high-altitude nuclear detonation, urban track traffic, DC transmission system monopole the earth fortune
The activity such as row can cause the obvious fluctuation of a wide range of surface potential, thus on the transformer neutral point of electric system ground connection operation
Generate the very low frequency electric current that DC current is either similar to DC current.This electric current not only jeopardizes the safety fortune of AC network
Row also can generate numerous adverse effects to underground metal pipes and industrial electricity apparatus, not only result in ground potential fluctuation sources
The irregular working of electric system and underground metalliferous pipe network system in the neighbourhood, earthquake monitoring stations and networks wrong report, can also generate one
Serial chain reaction, causes great safety accident and economic loss, brings huge negative effect to modern society.
For power transmission network due to its wide geographical distribution and lowohmic network characteristic, ground electric potential fluctuation can be in electric system
Characteristic current distribution is generated, so power transmission network is the monitoring network that can find ground electric potential fluctuation well.It is limited to mesh
Relevant transformer neutral point monitoring device is not arranged in preceding electric system for ground electric potential fluctuation, how to go monitoring transformation
Device neutral point current, then carry out the intensity in inverting ground electric potential fluctuation source from current monitoring value and position is a very significant work
Make.
It is distributed and carries out for the characteristic current in AC system under the direct current transportation the earth return method of operation both at home and abroad at present
A large amount of research, but these researchs belong to the research of direct ideation, i.e., ground potential is calculated in situation known to fluctuation sources
Fluctuation, to calculate the DC current distribution in electric system.The characteristic morphology electricity of transformer neutral point in known electric system
Flow distribution inverting fluctuation sources parameter (fluctuation sources form, fluctuation sources size of current and fluctuation source position), realizes ground electric potential fluctuation source
It positions urgently to be resolved.
Summary of the invention
The present invention provides a kind of localization method of direct-current ground potential fluctuation sources, and this method can realize preliminary criterion fluctuation sources position
It sets and direction, and calculates position and the size of current in region ground electric potential fluctuation source.
In order to reach above-mentioned technical effect, technical scheme is as follows:
A kind of localization method of region direct-current ground potential fluctuation sources, comprising the following steps:
S1: monitoring region AC network substation grounding neutral point obtains all grounded neutral direct currents of regional power grid
Flow size and Orientation；
S2: wave is determined according to the direction of the substation transformer neutral point current of edge placements several in regional exchange power grid
The direction of dynamic ource electric current, and determine fluctuation source region；
S3: the DC current distributed model of AC network is made of node and branch, and combination field road coupling model establishes wave
Dynamic source and direct current distributed current relationship；
S4: in conjunction with substation's geographical location information, it is randomly provided fluctuation source position and size in fluctuation source region, obtains change
The distribution of power station neutral point direct current, and compared with measurement result, fluctuation sources size and location is adjusted, until error satisfaction is wanted
It asks.
Further, according to the direction of the substation transformer neutral point current of edge placement and wave in regional exchange power grid
The direction of dynamic ource electric current is identical, chooses the transformer neutral point current direction substation near zone contrary with fluctuation sources and makees
To fluctuate source region.
Further, the process in the step S3 is:
Enable S=UI, wherein S is conductance matrix, and U is node voltage, and I is node Injection Current:
I.e.
Wherein AgIncidence matrix between node voltage and ground node voltage, GgSubstation grounding conductance matrix；
P=ФgCG+ФdcCdc (3)
Wherein P is surface potential, ФgThe mutual resistance between substation, ФdcThe mutual resistance between substation's fluctuation sources, CgFor substation
Injection Current, CdcFor fluctuation sources Injection Current；
Cg=Фg(Ug- P)=Фg(AgU-P) (4)
Simultaneous (2), (3), (4) obtain U:
Wherein K1, K2It is intermediary matrix, formula (5) represents response of the transformer neutral point to interference source.
Further, when error is below 0.1%, fluctuation sources size of current is determined.
Compared with prior art, the beneficial effect of technical solution of the present invention is:
The method of the present invention obtains regional power grid institute according to regional exchange electricity grid substation grounded neutral DC System Monitoring
There is grounded neutral DC current size and Orientation；Consider conducting wire DC impedance, substation grounding resistance, the earth soil resistivity
Etc. factors, in conjunction with neutral point current monitoring network, according in the substation transformer of edge placements several in regional exchange power grid
Property point sense of current determines fluctuation sources sense of current, i.e. the neutral point current side of fluctuation sources current direction and edge substation
To identical.If there is the edge substation situation contrary with fluctuation sources, then using the region as fluctuation source region；Track
Under traffic circulation mode based on existing transformer dc current monitoring data, network DC current parameters and the earth electricity are considered
Resistance rate parameter, exploitation ground potential are distributed software for calculation；Then in conjunction with substation's geographical location information, in fluctuation source region machine setting
Source position and size are fluctuated, show that substation's neutral point direct current is distributed, and compare with measurement result, adjustment fluctuation sources are big
Small and position, until error is met the requirements.
Detailed description of the invention
Fig. 1 is the flow chart of this forwarding method.
Specific embodiment
The attached figures are only used for illustrative purposes and cannot be understood as limitating the patent；
In order to better illustrate this embodiment, the certain components of attached drawing have omission, zoom in or out, and do not represent actual product
Size；
To those skilled in the art, it is to be understood that certain known features and its explanation, which may be omitted, in attached drawing
's.
The following further describes the technical solution of the present invention with reference to the accompanying drawings and examples.
Embodiment 1
As shown in Figure 1, a kind of localization method of region direct-current ground potential fluctuation sources, comprising the following steps:
S1: monitoring region AC network substation grounding neutral point obtains all grounded neutral direct currents of regional power grid
Flow size and Orientation；
S2: wave is determined according to the direction of the substation transformer neutral point current of edge placements several in regional exchange power grid
The direction of dynamic ource electric current, and determine fluctuation source region；
S3: the DC current distributed model of AC network is made of node and branch, and combination field road coupling model establishes wave
Dynamic source and direct current distributed current relationship；
S4: in conjunction with substation's geographical location information, it is randomly provided fluctuation source position and size in fluctuation source region, obtains change
The distribution of power station neutral point direct current, and compared with measurement result, fluctuation sources size and location is adjusted, until error satisfaction is wanted
It asks.
According to the direction of the substation transformer neutral point current of edge placement in regional exchange power grid and fluctuation ource electric current
Direction it is identical, choose the transformer neutral point current direction substation near zone contrary with fluctuation sources as fluctuation sources
Region.
Process in step S3 is:
Enable S=UI, wherein S is conductance matrix, and U is node voltage, and I is node Injection Current:
I.e.
Wherein AgIncidence matrix between node voltage and ground node voltage, GgSubstation grounding conductance matrix；
P=ФgCg+ФdcCdc (3)
Wherein P is surface potential, ФgThe mutual resistance between substation, ФdcThe mutual resistance between substation's fluctuation sources, CgFor substation
Injection Current, CdcFor fluctuation sources Injection Current；
Cg=Фg(Ug- P)=Фg(AgU-P) (4)
Simultaneous (2), (3), (4) obtain U:
Wherein K1, K2It is intermediary matrix, formula (5) represents response of the transformer neutral point to interference source.
In ground potential distribution software, electric network model is established, and grid dividing is carried out to it in fluctuation source region；Each
Grid element center gradually places fluctuation sources and carries out simulation calculation；Substation's neutral point current value is linearly closed with fluctuation sources current value
Simulation result is become neutral point direct current characteristic value with monitoring and compared by system, determines fluctuation source position；On the basis of above-mentioned steps
On, increase and decrease simulated current value determines fluctuation sources size of current when error is below 0.1%.
The same or similar label correspond to the same or similar components；
Described in attached drawing positional relationship for only for illustration, should not be understood as the limitation to this patent；
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair
The restriction of embodiments of the present invention.For those of ordinary skill in the art, may be used also on the basis of the above description
To make other variations or changes in different ways.There is no necessity and possibility to exhaust all the enbodiments.It is all this
Made any modifications, equivalent replacements, and improvements etc., should be included in the claims in the present invention within the spirit and principle of invention
Protection scope within.
Claims (4)
1. a kind of localization method of region direct-current ground potential fluctuation sources, which comprises the following steps:
S1: it is big to obtain all grounded neutral DC currents of regional power grid for monitoring region AC network substation grounding neutral point
Small and direction；
S2: fluctuation sources are determined according to the direction of the substation transformer neutral point current of edge placements several in regional exchange power grid
Sense of current, and determine fluctuation source region；
S3: the DC current distributed model of AC network is made of node and branch, and combination field road coupling model establishes fluctuation sources
With direct current distributed current relationship；
S4: in conjunction with substation's geographical location information, it is randomly provided fluctuation source position and size in fluctuation source region, obtains substation
Neutral point direct current distribution, and compared with measurement result, fluctuation sources size and location is adjusted, until error is met the requirements.
2. the localization method of direct-current ground potential fluctuation sources in region according to claim 1, which is characterized in that the step S2
In, according to the direction of the substation transformer neutral point current of edge placement in regional exchange power grid and fluctuation sources sense of current
It is identical, the transformer neutral point current direction substation near zone contrary with fluctuation sources is chosen as fluctuation source region.
3. the localization method of direct-current ground potential fluctuation sources in region according to claim 1, which is characterized in that the step S3
In process be:
Enable S=UI, wherein S is conductance matrix, and U is node voltage, and I is node Injection Current:
I.e.
Wherein AgIncidence matrix between node voltage and ground node voltage, GgSubstation grounding conductance matrix；
P=ΦgCg+ΦdcCdc (3)
Wherein P is surface potential, ΦgThe mutual resistance between substation, ΦdcThe mutual resistance between substation's fluctuation sources, CgElectricity is injected for substation
Stream, CdcFor fluctuation sources Injection Current；
Cg=Φg(Ug- P)=Φg(AgU-P) (4)
Simultaneous (2), (3), (4) obtain U:
Wherein K1, K2It is intermediary matrix, formula (5) represents response of the transformer neutral point to interference source.
4. the localization method of direct-current ground potential fluctuation sources in region according to claim 1, which is characterized in that the step S4
In, when error is below 0.1%, determine fluctuation sources size of current.
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