CN107907752B - Method for positioning regional direct current ground potential fluctuation source - Google Patents
Method for positioning regional direct current ground potential fluctuation source Download PDFInfo
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- CN107907752B CN107907752B CN201710868921.3A CN201710868921A CN107907752B CN 107907752 B CN107907752 B CN 107907752B CN 201710868921 A CN201710868921 A CN 201710868921A CN 107907752 B CN107907752 B CN 107907752B
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- direct current
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- grounded neutral
- fluctuation source
- transformer substation
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
Abstract
The invention relates to the technical field of power transmission and transformation, and discloses a method for positioning a regional direct current ground potential fluctuation source, which comprises the following steps: the method comprises the steps of establishing a transformer substation grounding neutral point direct current monitoring network, obtaining the direct current magnitude and direction of a grounding neutral point, developing direct current distribution calculation software on the basis of transformer direct current monitoring data in a mode that a direct current transmission ground in the monitoring network returns to operation, deducing transformer substation grounding neutral point direct current distribution through the direct current distribution calculation software, comparing the transformer substation grounding neutral point direct current magnitude and direction with the transformer grounding neutral point direct current magnitude and direction obtained by the monitoring network, and obtaining the position and current magnitude of a fluctuation source. The method for positioning the regional direct current ground potential fluctuation source accurately positions the ground potential fluctuation source by utilizing the existing regional alternating current power grid transformer substation system without additionally detecting a detection station, thereby greatly reducing the detection cost.
Description
Technical Field
The invention relates to the technical field of power transmission and transformation, in particular to a method for positioning a regional direct current ground potential fluctuation source.
Background
Recent studies find that activities such as magnetic storm, high-altitude nuclear explosion, urban rail transit, monopolar and earth operation of a direct-current transmission system and the like can cause obvious fluctuation of earth surface potential in a large range, so that direct current or very low frequency current similar to the direct current is generated on a neutral point of a transformer in grounded operation of a power system. The current not only endangers the safe operation of an alternating current power grid, but also has a plurality of adverse effects on underground metal pipelines and industrial electric equipment, can cause abnormal work of a power system and an underground metal pipe network system in the area near a ground potential fluctuation source and false alarm of an earthquake monitoring station network, can also generate a series of chain reactions, causes great safety accidents and economic losses, and brings huge negative effects to the modern society.
The power transmission network has wide geographical distribution and low-resistance network characteristics, and the ground potential fluctuation can generate characteristic current distribution in a power system, so the power transmission network is a monitoring network capable of well finding the ground potential fluctuation, a great deal of research is currently carried out at home and abroad on the characteristic current distribution in an alternating current system under the direct current power transmission ground return operation mode, but the research belongs to forward thinking research, namely, the fluctuation of the ground potential is calculated under the condition that a fluctuation source is known, so that the direct current distribution in the power system is calculated, and the ground potential fluctuation source cannot be positioned.
Disclosure of Invention
The invention aims to provide a method for positioning a regional direct current ground potential fluctuation source, which can preliminarily judge the position and direction of the fluctuation source by monitoring the current of a neutral point of a transformer and then deduce the specific position and current magnitude of the fluctuation source through direct current distribution calculation software.
In order to achieve the purpose, the method for positioning the regional direct current ground potential fluctuation source comprises the following steps:
A) establishing a direct current monitoring network of a grounding neutral point of a transformer substation of a regional alternating current power grid, and acquiring the magnitude and direction of direct current of all grounding neutral points in the direct current monitoring network of the grounding neutral point;
B) in the grounded neutral point direct current monitoring network established in the step A), taking the grounded neutral point direct current direction of each edge position transformer substation in the grounded neutral point direct current monitoring network as the current direction of the fluctuation source at each edge position of the grounded neutral point direct current monitoring network;
C) sequentially taking the direct current direction of the grounded neutral point of the transformer substation from each edge position of the grounded neutral point direct current monitoring network inwards until the taken direct current direction of the grounded neutral point of the transformer substation is opposite to the direction of the fluctuation source current obtained in the step B) from the corresponding edge position of the grounded neutral point direct current monitoring network, and then taking the transformer substation area as a fluctuation source area;
D) developing direct current distribution calculation software according to the direct current transmission earth return transformer direct current monitoring data in the grounded neutral point direct current monitoring network in the step A) in the running mode, and combining network direct current parameters and earth resistivity parameters;
E) combining the geographical position information of the transformer substation, utilizing the direct current distribution calculation software developed in the step D), randomly setting the position of the fluctuation source in the fluctuation source region determined in the step C), calculating the distribution of the direct current of the grounded neutral point of the transformer substation through direct current distribution calculation software, comparing the calculated distribution of the direct current of the grounded neutral point of the transformer substation with the direct current directions of all the grounded neutral points in the grounded neutral point direct current monitoring network obtained in the step A), adjusting the position of a random fluctuation source until the calculated direct current directions of the direct current distribution of the transformer substation grounded neutral point are the same as the direct current directions of all grounded neutral points in the grounded neutral point direct current monitoring network obtained in the step A), so as to determine that the position of the random fluctuation source is the position of the actually generated fluctuation source;
F) increasing or decreasing the current of the fluctuation source on the position of the fluctuation source determined in the step E), calculating the distribution of the direct current of the grounded neutral point of the transformer substation through direct current distribution calculation software, comparing the calculated distribution of the direct current of the grounded neutral point of the transformer substation with the direct current of all the grounded neutral points in the direct current monitoring network of the grounded neutral point obtained in the step A), and determining the current of the fluctuation source to be the current of the actually generated fluctuation source when the error between the calculated direct current of the grounded neutral point of the transformer substation and the direct current of all the grounded neutral points in the direct current monitoring network of the grounded neutral point obtained in the step A) is less than 0.1%.
Preferably, in the step D), the dc distribution calculation software includes a dc current distribution model composed of nodes and branches in the regional ac power grid, and the dc distribution calculation software establishes a relationship between the ripple source and the dc current distribution in combination with the field-circuit coupling model.
Preferably, in the step D), the direct current distribution calculation software performs mesh division on the fluctuation source region.
Preferably, in the step E), the position of the source of the fluctuation is randomly set in each grid in sequence, and the calculation is performed.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, the characteristics that the power transmission network is wide in geographical distribution, the ground network resistance is lower than that of soil, and any ground potential fluctuation source can generate characteristic current in the power system are utilized, so that the monitoring and positioning of the ground potential fluctuation are more easily realized;
2. by utilizing the network parameters and the soil parameters of the power system, the mutual-pushing relation between the ground potential fluctuation source and the grounding neutral point current of the transformer substation is theoretically established, so that the fluctuation source is accurately positioned, and the positioning accuracy is ensured by verifying in direct-current distribution software;
3. the invention utilizes the existing regional alternating current power grid transformer substation system to accurately position the ground potential fluctuation source, does not need to additionally detect a detection station, and greatly reduces the detection cost.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
The invention relates to a method for positioning a regional direct current ground potential fluctuation source, which comprises the following steps:
A) according to a specific longitude and latitude of a certain place, establishing a regional alternating current power grid transformer substation grounding neutral point direct current monitoring network, and acquiring the magnitude and direction of direct current of all grounding neutral points in the grounding neutral point direct current monitoring network, wherein the regional alternating current power grid transformer substation grounding neutral point direct current monitoring network in the embodiment comprises the following 16 transformer substations;
B) in the grounded neutral point direct current monitoring network established in the step A), taking the grounded neutral point direct current direction of each edge position transformer substation in the grounded neutral point direct current monitoring network as the current direction of a fluctuation source at each edge position of the grounded neutral point direct current monitoring network;
C) sequentially taking the direct current direction of the grounded neutral point of the transformer substation from each edge position of the grounded neutral point direct current monitoring network inwards until the taken direct current direction of the grounded neutral point of the transformer substation is opposite to the direction of the fluctuation source current obtained in the step B) from the corresponding edge position of the grounded neutral point direct current monitoring network, and then taking the transformer substation area as a fluctuation source area; in the embodiment, the area where the 15 th transformer substation is located is a fluctuation source area;
D) according to the transformer direct current monitoring data in the grounded neutral point direct current monitoring network in the step A) in the running mode of returning the direct current transmission ground to the transformer, developing direct current distribution calculation software by combining network direct current parameters and ground resistivity parameters, wherein the direct current distribution calculation software carries out grid division on a fluctuation source region and comprises a direct current distribution model consisting of nodes and branches in a regional alternating current power grid, and establishes the relation between a fluctuation source and direct current distribution by combining the direct current distribution calculation software and a field coupling model;
E) combining the geographical position information of the transformer substation, utilizing the direct current distribution calculation software developed in the step D), randomly setting the position of the wave source in each grid in sequence in the wave source area determined in the step C), calculating the distribution of the direct current of the grounded neutral point of the transformer substation through direct current distribution calculation software, comparing the calculated distribution of the direct current of the grounded neutral point of the transformer substation with the direct current directions of all the grounded neutral points in the grounded neutral point direct current monitoring network obtained in the step A), adjusting the position of a random fluctuation source until the calculated direct current directions of the direct current distribution of the transformer substation grounded neutral point are the same as the direct current directions of all grounded neutral points in the grounded neutral point direct current monitoring network obtained in the step A), so as to determine that the position of the random fluctuation source is the position of the actually generated fluctuation source; the calculation result of the embodiment is 121.5019 degrees longitude and 30.9699 degrees latitude;
F) increasing or decreasing the current magnitude of the fluctuation source on the position of the fluctuation source determined in the step E), calculating the distribution of the direct current of the grounded neutral point of the transformer substation through direct current distribution calculation software, comparing the calculated distribution of the direct current of the grounded neutral point of the transformer substation with the direct current magnitudes of all the grounded neutral points in the grounded neutral point direct current monitoring network obtained in the step A), and determining the current magnitude of the fluctuation source to be the current magnitude of the actually generated fluctuation source when the calculated direct current magnitudes in the distribution of the direct current of the grounded neutral point of the transformer substation and the direct current magnitudes of all the grounded neutral points in the grounded neutral point direct current monitoring network obtained in the step A) have errors smaller than 0.1%, wherein the calculation result in the embodiment is 3002.5A.
The calculated results were compared with the actual parameters and the data matched as shown in the following table:
the method for positioning the regional direct-current ground potential fluctuation source accurately positions the ground potential fluctuation source by utilizing the existing regional alternating-current power grid transformer substation system without additionally detecting a detection station, greatly reduces the detection cost, theoretically establishes the mutual-deduction relationship between the ground potential fluctuation source and the transformer substation grounding neutral point current by utilizing the network parameters and the soil parameters of the power system, realizes the accurate positioning of the fluctuation source, and ensures the positioning accuracy by verifying in direct-current distribution software.
Claims (4)
1. A method for positioning a regional direct current ground potential fluctuation source is characterized by comprising the following steps:
A) establishing a direct current monitoring network of a grounding neutral point of a transformer substation of a regional alternating current power grid, and acquiring the magnitude and direction of direct current of all grounding neutral points in the direct current monitoring network of the grounding neutral point;
B) in the grounded neutral point direct current monitoring network established in the step A), taking the grounded neutral point direct current direction of each edge position transformer substation in the grounded neutral point direct current monitoring network as the current direction of the fluctuation source at each edge position of the grounded neutral point direct current monitoring network;
C) sequentially taking the direct current direction of the grounded neutral point of the transformer substation from each edge position of the grounded neutral point direct current monitoring network inwards until the taken direct current direction of the grounded neutral point of the transformer substation is opposite to the direction of the fluctuation source current obtained in the step B) from the corresponding edge position of the grounded neutral point direct current monitoring network, and then taking the transformer substation area as a fluctuation source area;
D) developing direct current distribution calculation software according to the direct current transmission earth return transformer direct current monitoring data in the grounded neutral point direct current monitoring network in the step A) in the running mode, and combining network direct current parameters and earth resistivity parameters;
E) combining the geographical position information of the transformer substation, utilizing the direct current distribution calculation software developed in the step D), randomly setting the position of the fluctuation source in the fluctuation source region determined in the step C), calculating the distribution of the direct current of the grounded neutral point of the transformer substation through direct current distribution calculation software, comparing the calculated distribution of the direct current of the grounded neutral point of the transformer substation with the direct current directions of all the grounded neutral points in the grounded neutral point direct current monitoring network obtained in the step A), adjusting the position of a random fluctuation source until the calculated direct current directions of the direct current distribution of the transformer substation grounded neutral point are the same as the direct current directions of all grounded neutral points in the grounded neutral point direct current monitoring network obtained in the step A), so as to determine that the position of the random fluctuation source is the position of the actually generated fluctuation source;
F) increasing or decreasing the current of the fluctuation source on the position of the fluctuation source determined in the step E), calculating the distribution of the direct current of the grounded neutral point of the transformer substation through direct current distribution calculation software, comparing the calculated distribution of the direct current of the grounded neutral point of the transformer substation with the direct current of all the grounded neutral points in the direct current monitoring network of the grounded neutral point obtained in the step A), and determining the current of the fluctuation source to be the current of the actually generated fluctuation source when the error between the calculated direct current of the grounded neutral point of the transformer substation and the direct current of all the grounded neutral points in the direct current monitoring network of the grounded neutral point obtained in the step A) is less than 0.1%.
2. The method for locating the regional direct current ground potential fluctuation source according to claim 1, characterized in that: in the step D), the direct current distribution calculation software comprises a direct current distribution model consisting of nodes and branches in a regional alternating current power grid, and the direct current distribution calculation software is combined with a field coupling model to establish a relation between a fluctuation source and direct current distribution.
3. The method for locating the regional direct current ground potential fluctuation source according to claim 1, characterized in that: in the step D), the direct current distribution computing software performs grid division on the fluctuation source region.
4. The method for locating a regional direct current ground potential fluctuation source according to claim 3, characterized in that: in the step E), the position of the fluctuation source is randomly set in each grid one by one, and calculation is carried out.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101267116A (en) * | 2008-03-20 | 2008-09-17 | 浙江工业大学 | An automatic method for power quality interference source of distribution grid |
| US7598625B2 (en) * | 2007-06-08 | 2009-10-06 | Honeywell International Inc. | Network-based aircraft secondary electric power distribution system |
| CN102033151A (en) * | 2009-09-25 | 2011-04-27 | 华东电力试验研究院有限公司 | System and method for monitoring direct-current ground potential |
| CN102778634A (en) * | 2012-07-11 | 2012-11-14 | 福建省电力有限公司电力科学研究院 | Distribution network voltage fluctuation positioning method and device |
| CN105738772A (en) * | 2016-04-18 | 2016-07-06 | 东南大学 | Compulsory disturbance source positioning method based on power and frequency fluctuation phase |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US9581624B2 (en) * | 2014-08-19 | 2017-02-28 | Southern States, Llc | Corona avoidance electric power line monitoring, communication and response system |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7598625B2 (en) * | 2007-06-08 | 2009-10-06 | Honeywell International Inc. | Network-based aircraft secondary electric power distribution system |
| CN101267116A (en) * | 2008-03-20 | 2008-09-17 | 浙江工业大学 | An automatic method for power quality interference source of distribution grid |
| CN102033151A (en) * | 2009-09-25 | 2011-04-27 | 华东电力试验研究院有限公司 | System and method for monitoring direct-current ground potential |
| CN102778634A (en) * | 2012-07-11 | 2012-11-14 | 福建省电力有限公司电力科学研究院 | Distribution network voltage fluctuation positioning method and device |
| CN105738772A (en) * | 2016-04-18 | 2016-07-06 | 东南大学 | Compulsory disturbance source positioning method based on power and frequency fluctuation phase |
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