CN110768256A - Transformer area topology identification method, device and system based on voltage harmonic atlas - Google Patents
Transformer area topology identification method, device and system based on voltage harmonic atlas Download PDFInfo
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Abstract
The invention discloses a method, a device and a system for identifying a distribution room topology based on a voltage harmonic map, and belongs to the field of low-voltage distribution automation systems. The method comprises the steps of comparing the distance between a transformer of a transformer area and a voltage harmonic spectrum of a household meter to identify the topology of the transformer area; the device comprises a three-phase voltage acquisition module, a local communication module and a main processing module, wherein the three-phase voltage acquisition module is used for acquiring the voltage of the low-voltage side of a transformer area, the local communication module is used for collecting voltage harmonic data of each household meter, and the main processing module is used for calculating a voltage harmonic map and comparing the distance between the voltage harmonic maps of the transformer area and the household meter to identify the topology of the transformer area; the system comprises a plurality of identification devices deployed in different transformer areas and a server. The server is used for identifying the station area and the phase to which the abnormal user list belongs. The method can effectively identify and verify the correctness of the topological structure data of the low-voltage distribution network, and improves the management informatization and intelligentization levels of the low-voltage distribution network.
Description
Technical Field
The invention belongs to the field of low-voltage distribution automation systems, and particularly relates to a method, a device and a system for identifying a distribution room topology based on a voltage harmonic map.
Background
And the transformer area (or low-voltage transformer area) refers to a low-voltage side power supply area of a 10kV/0.4kV distribution transformer. The topology of the cell refers to the relationship between the cell and the user table (cell-user), and further, the user table belongs to the subordinate relationship of a certain phase (cell-phase-user) in A, B, C three phases in the cell. In the construction of an information system of a power distribution network, management and distribution relations need to be combed, an accurate station-line-transformer (transformer area) -household incidence relation is established on the basis of graphical display of a power distribution network GIS platform, informatization and intellectualization of power distribution network power utilization management is achieved, and intelligent power utilization service level and production and marketing business operation efficiency are improved.
In the past, attention to a distribution area is insufficient, and two error expression forms mainly exist in distribution area topological relations, particularly in a user-to-user relation: (1) some users do not have complete user profile information due to historical reasons; (2) the topological relation of the user profile information record does not correspond to the actual topological relation. These errors can affect the normal deployment of services based on the topology of the power distribution network. In order to check and correct the errors, the common practice of power grid companies is to manually record the changes and update the platform-related data when the actual topology of the power distribution network changes, or to manually and practically manage and correct the errors. These methods are labor intensive, time consuming, and not accurate enough.
Therefore, the accurate identification and verification of the topological relation of the low-voltage distribution network, particularly the accurate user-variable relation, are the basis and the key of the current distribution network management refinement.
Disclosure of Invention
Aiming at the defects or improvement requirements in the prior art, the invention provides a method, a device and a system for identifying the distribution area topology based on the voltage harmonic atlas, so that the technical problems of time consumption, labor consumption and low accuracy existing in the prior art that the topological relation of the low-voltage distribution network is identified and verified in a manual mode when the actual topological structure of the distribution network is changed are solved.
In order to achieve the above object, according to an aspect of the present invention, there is provided a method for identifying a topology of a distribution room based on a voltage harmonic map, including:
measuring each phase voltage at the low-voltage side of the distribution transformer of the transformer area, and obtaining a voltage harmonic map of each phase of the distribution transformer of the transformer area through harmonic analysis;
obtaining the voltage harmonic content of each household meter by using a local metering network to form a voltage harmonic map of each household meter;
and acquiring a target distance between the voltage harmonic map of each household meter and the voltage harmonic map of each phase of the distribution transformer of the transformer area, and judging whether each household meter belongs to the transformer area or not according to the relation between the target distance and a preset distance threshold.
Preferably, the obtaining a target distance between the voltage harmonic map of each of the household meters and the voltage harmonic map of each phase of the distribution transformer in the distribution area, and determining whether each household meter belongs to the distribution area according to a relationship between the target distance and a preset distance threshold includes:
for any voltage harmonic map of a target household meter, acquiring the minimum value of the distance between the voltage harmonic map of the target household meter and the voltage harmonic map of each phase of the distribution transformer of the transformer area;
if the minimum value of the distance is larger than the preset distance threshold value, judging that the target user table does not belong to the station area;
if the minimum value of the distance is smaller than the preset distance threshold value, judging that the target user table belongs to the station area, and the phase of the target user table is the phase corresponding to the minimum value of the distance.
According to another aspect of the present invention, there is provided a station area topology identification apparatus based on a voltage harmonic map, including: the system comprises a three-phase voltage acquisition module, a local communication module and a main processing module;
the three-phase voltage acquisition module is used for measuring each phase voltage at the low-voltage side of the distribution transformer of the transformer area;
the local communication module is used for communicating with each user meter in a local network to obtain the voltage harmonic content of each user meter;
the main processing module is used for obtaining the voltage harmonic maps of all phases of the distribution transformer of the transformer area through harmonic analysis, forming the voltage harmonic maps of all the household meters according to the voltage harmonic content of all the household meters, obtaining the target distance between the voltage harmonic maps of all the household meters and the voltage harmonic maps of all the phases of the distribution transformer of the transformer area, and judging whether all the household meters belong to the transformer area or not according to the relation between the target distance and a preset distance threshold.
Preferably, the main processing module is specifically configured to, for a voltage harmonic map of any target subscriber meter, obtain a minimum value of a distance between the voltage harmonic map of the target subscriber meter and a voltage harmonic map of each phase of the distribution transformer in the transformer area; if the minimum value of the distance is larger than the preset distance threshold value, judging that the target user table does not belong to the station area; if the minimum value of the distance is smaller than the preset distance threshold value, judging that the target user table belongs to the station area, and the phase of the target user table is the phase corresponding to the minimum value of the distance.
Preferably, the apparatus further comprises: a remote communication module;
and the remote communication module is used for reporting the household meter ID which does not belong to the transformer area, the voltage harmonic map of the household meter ID and the voltage harmonic map of the transformer area.
Preferably, the apparatus further comprises: the device comprises a human-computer interface module, a power supply module and a storage module;
the human-computer interface module is used for checking field information;
the power supply module is used for providing power supply for the device;
the storage module is used for storing configuration information, local voltage harmonic maps and other information.
According to another aspect of the present invention, there is provided a station area topology identification system based on a voltage harmonic map, including: the station area topology identification device is deployed in any one of the station areas and based on the voltage harmonic map;
the server is configured to receive the three-phase voltage harmonic map of each area, the abnormal household meter ID, and the voltage harmonic map of each abnormal household meter reported by each device, obtain, for any target abnormal household meter, a distance between the voltage harmonic map of the target abnormal household meter and each phase voltage harmonic map of each area, and find out a minimum distance, where a corresponding area of the minimum distance is an area to which the target abnormal household meter belongs, and a phase of a corresponding area of the minimum distance is a phase of a corresponding area to which the target abnormal household meter belongs.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
(1) the method for identifying the platform area topology has higher accuracy and reliability. The voltage harmonic map distance is used as a judgment basis, the load composition and the operation characteristics of the corresponding transformer area different from other transformer areas are reflected, and the essential characteristics of the corresponding transformer area different from other transformer areas are reflected, so that the accuracy of the transformer area can be ensured. Meanwhile, the transformer of the transformer area has a natural isolation effect on the voltage harmonic map, namely, when the harmonic waves cross to other transformer areas through the transformer, distortion is generated, the harmonic waves are overlapped with the harmonic waves of other transformer areas to form a new harmonic map, and the new harmonic map is different from the harmonic map of the original transformer area, so that the problem of cross talk in the traditional method is avoided, and the reliability of the transformer area is ensured;
(2) the station area topology identification method based on the voltage harmonic map has the advantages of being small in calculation amount, fast and simple.
(3) The device used by the invention is deployed on the low-voltage side of the transformer of each transformer area on site, and the voltage harmonic spectrum distance is calculated in a distributed mode, so that the defect of high concentration ratio and large calculation amount of the traditional method is avoided, and the communication flow and the calculation resource are saved.
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Fig. 1 is a schematic flowchart of a station area topology identification method based on a voltage harmonic map according to an embodiment of the present invention;
FIG. 2 is a block diagram of an apparatus according to an embodiment of the present invention;
fig. 3 is a structural diagram of a platform topology identification system based on a voltage harmonic map according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The invention provides a method, a device and a system for identifying a transformer area topology based on a voltage harmonic map, which are used for identifying and verifying a low-voltage distribution network user-to-transformer topology relation by using the principle that a transformer in the same transformer area is similar to a voltage harmonic map of a user meter, solving the problem that the topology relation recorded by user file information is inconsistent with the actual topology relation or even omitted, and providing a basis for improving the power supply reliability, realizing line loss four-point management and improving the customer service level.
Fig. 1 is a schematic flow chart of a station area topology identification method based on a voltage harmonic map according to an embodiment of the present invention, where the method shown in fig. 1 includes the following steps:
s1: acquiring a voltage harmonic map of a transformer area;
in the embodiment of the invention, the voltage harmonic map represents a group of multidimensional vectors formed by the content rates of the harmonics of the voltage. The voltage subharmonics can be obtained by performing a Fast Fourier Transform (FFT) on the sequence of voltage samples.
And measuring each phase voltage on the low-voltage side of the transformer in the transformer area, and obtaining voltage harmonic maps of three phases of the transformer A, B, C, namely UGA, UGB and UGC through harmonic analysis.
S2: acquiring a household meter voltage harmonic spectrum;
obtaining the content rate of each subharmonic of each household meter voltage by using a local metering network to form a voltage harmonic map UGM;
s3: calculating and identifying:
the distance between the harmonic wave pattern of the household meter voltage and the harmonic wave pattern of the transformer voltage is calculated by Euclidean distance (Euclidean distance). Let vector X be { X ═ Xi|i＝1,2,…N}，xiRepresenting voltage harmonicsThe ith element of vector X, vector Y ═ Yi|i＝1,2,…N}，yiRepresenting the ith element of the voltage harmonic vector Y. Define the euclidean distance between the two sets of harmonic vectors X, Y as:
n represents the maximum voltage harmonic number, and in the embodiment of the present invention, the maximum voltage harmonic number is generally 31.
Comparing distances between the voltage harmonic map UGM of each household meter and the three-phase voltage harmonic maps UGA, UGB and UGC of the transformer area to be D (UGM, UGA), D (UGM, UGB) and D (UGM, UGC);
taking the minimum distance as:
Dmin＝MIN{D(UGM,UGA),D(UGM,UGB),D(UGM,UGC)}；
setting an appropriate distance threshold thD to determine whether the user belongs to the zone:
when D is presentminIf the value is greater than the threshold value thD, the user list is not considered to belong to the station area;
when D is presentminWhen the value is less than the threshold value thD, the user table is considered to belong to the station area, and the corresponding D is the position of the user tableminAnd (4) corresponding to each other.
To further increase the accuracy of identification, the weight coefficient matrix K may be set to { K ═ according to the different penetration of harmonics to the transformer of different ordersi1,2, … N, where k is equal to or less than 0iLess than or equal to 1. The distance calculation formula among the voltage harmonic maps is improved as follows:
x and Y respectively represent two groups of vectors corresponding to the voltage harmonic map, and N represents the maximum harmonic frequency; k is a radical ofiRepresenting the weight coefficient of the ith harmonic in the voltage harmonic map, and taking the value k as i is larger to enhance the effect of the higher harmonic in the voltage harmonic mapiThe larger the size, the more non-exclusive the embodiment of the present invention is. k is a radical ofiAn alternative value of (a) is a discrete sequence
xiThe i-th element, y, representing the voltage harmonic vector XiRepresenting the ith element of the voltage harmonic vector Y.
In the embodiment of the present invention, the distance threshold thD may be determined according to actual needs, and the embodiment of the present invention is not limited uniquely.
In the embodiment of the invention, the distance between the household meter voltage harmonic map and the voltage harmonic map at the low-voltage side of the transformer reflects, the distance between the household meter voltage harmonic map in the same transformer area and the voltage harmonic map at the low-voltage side of the transformer is smaller, and the distance between the household meter voltage harmonic map not in the same transformer area and the voltage harmonic map at the low-voltage side of the transformer is larger.
In the embodiment of the present invention, in consideration of dynamic changes of voltage harmonics, in acquiring the voltage harmonic maps in steps S1 and S2, clock synchronization between the topology identification device and the user electricity meter is required to acquire the station area voltage harmonics and the user electricity meter voltage harmonics at the same time period.
Fig. 2 is a block diagram of an apparatus according to an embodiment of the present invention, where the apparatus shown in fig. 2 includes: the device comprises a three-phase voltage acquisition module, a local communication module, a main processing module and a remote communication module.
As an optional implementation, the apparatus further comprises: the man-machine interface module, the power supply module and the storage module form a complete terminal device.
The functions of the modules of the device are detailed as follows:
① three-phase voltage collection module is used to collect the voltage of transformer low voltage side in the transformer area and send the voltage sampling value to the main processing module, ② local communication module is used to communicate with each ammeter in the local network and get the content of each sub-harmonic of the ammeter, ③ main processing module is used to send command to the collection module and the local communication module to get the voltage harmonic map of transformer low voltage side and the voltage harmonic map of ammeter user side and identify the household ammeter not belonging to the area by the above-mentioned topology identification method of area based on voltage harmonic map, ④ remote communication interface is used to report the harmonic voltage harmonic map not belonging to the area, the ID and voltage harmonic map, ⑤ man-machine interface module uses keys and screen for viewing field information, ⑥ power supply module provides the power supply of the whole device, ⑦ storage module is used to store the configuration information and the information such as local voltage harmonic map.
Fig. 3 is a structural diagram of a station area topology identification system based on a voltage harmonic map according to an embodiment of the present invention, and the specific implementation flow is as follows:
(a) making the voltage harmonic map of the abnormal household meter x be UGM (x), and the voltage harmonic map of the transformer area j be UGA (j), UGB (j) and UGC (j);
(b) calculating Euclidean distances between UGM (x) and UGA (j), UGB (j) and UGC (j) for the region j, and taking the minimum dmin (j);
(c) repeating the step (b) for all the areas of the target area to obtain the distances between all the areas and the x voltage harmonic spectrum of the household meter, sequencing, and taking the area and the phase corresponding to the minimum Dmin as the area and the phase of the electric meter;
(d) and (c) repeating the steps (a) to (c) until all the abnormal electric meters are identified.
The following description will be made with reference to fig. 3 as an example:
in the implementation example of the invention, the system consists of a server and a plurality of devices which are arranged on the low-voltage side of the distribution transformer in each area.
In the present embodiment, the respective portions are explained as follows:
(1) each station topology identification device identifies the user table which does not belong to the station area as an abnormal user table x through the steps in the station topology identification method based on the voltage harmonic atlas;
(2) the station area topology identification device reports the voltage harmonic map UGA (j), the UGB (j), the UGC (j), the ID of the abnormal user table x and the voltage harmonic map UGM (x) thereof to a server;
(3) and (4) the server identifies the station area and the phase to which each abnormal user table belongs through the calculation in the steps (a) to (d).
It should be noted that, according to the implementation requirement, each step/component described in the present application can be divided into more steps/components, and two or more steps/components or partial operations of the steps/components can be combined into new steps/components to achieve the purpose of the present invention.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. A station zone topology identification method based on a voltage harmonic map is characterized by comprising the following steps:
measuring each phase voltage at the low-voltage side of the distribution transformer of the transformer area, and obtaining a voltage harmonic map of each phase of the distribution transformer of the transformer area through harmonic analysis;
obtaining the voltage harmonic content of each household meter by using a local metering network to form a voltage harmonic map of each household meter;
and acquiring a target distance between the voltage harmonic map of each household meter and the voltage harmonic map of each phase of the distribution transformer of the transformer area, and judging whether each household meter belongs to the transformer area or not according to the relation between the target distance and a preset distance threshold.
2. The method according to claim 1, wherein the obtaining of the target distance between the voltage harmonic map of each household meter and the voltage harmonic map of each phase of the distribution transformer in the distribution area, and the determining whether each household meter belongs to the distribution area according to the relationship between the target distance and a preset distance threshold comprises:
for any voltage harmonic map of a target household meter, acquiring the minimum value of the distance between the voltage harmonic map of the target household meter and the voltage harmonic map of each phase of the distribution transformer of the transformer area;
if the minimum value of the distance is larger than the preset distance threshold value, judging that the target user table does not belong to the station area;
if the minimum value of the distance is smaller than the preset distance threshold value, judging that the target user table belongs to the station area, and the phase of the target user table is the phase corresponding to the minimum value of the distance.
3. A platform district topology recognition device based on voltage harmonic map, characterized by includes: the system comprises a three-phase voltage acquisition module, a local communication module and a main processing module;
the three-phase voltage acquisition module is used for measuring each phase voltage at the low-voltage side of the distribution transformer of the transformer area;
the local communication module is used for communicating with each user meter in a local network to obtain the voltage harmonic content of each user meter;
the main processing module is used for obtaining the voltage harmonic maps of all phases of the distribution transformer of the transformer area through harmonic analysis, forming the voltage harmonic maps of all the household meters according to the voltage harmonic content of all the household meters, obtaining the target distance between the voltage harmonic maps of all the household meters and the voltage harmonic maps of all the phases of the distribution transformer of the transformer area, and judging whether all the household meters belong to the transformer area or not according to the relation between the target distance and a preset distance threshold.
4. The apparatus according to claim 3, wherein the main processing module is specifically configured to, for a voltage harmonic map of any target user meter, obtain a minimum value of a distance between the voltage harmonic map of the target user meter and a voltage harmonic map of each phase of the distribution transformer of the transformer area; if the minimum value of the distance is larger than the preset distance threshold value, judging that the target user table does not belong to the station area; if the minimum value of the distance is smaller than the preset distance threshold value, judging that the target user table belongs to the station area, and the phase of the target user table is the phase corresponding to the minimum value of the distance.
5. The apparatus of claim 3 or 4, further comprising: a remote communication module;
and the remote communication module is used for reporting the household meter ID which does not belong to the transformer area, the voltage harmonic map of the household meter ID and the voltage harmonic map of the transformer area.
6. The apparatus of claim 5, further comprising: the device comprises a human-computer interface module, a power supply module and a storage module;
the human-computer interface module is used for checking field information;
the power supply module is used for providing power supply for the device;
the storage module is used for storing configuration information, local voltage harmonic maps and other information.
7. A platform zone topology identification system based on voltage harmonic atlas is characterized by comprising: the station topology identification device based on the voltage harmonic map is deployed in a plurality of stations and comprises a server and the station topology identification device based on the voltage harmonic map, wherein the station topology identification device is arranged in the plurality of stations and comprises a first network unit and a second network unit;
the server is configured to receive the three-phase voltage harmonic map of each area, the abnormal household meter ID, and the voltage harmonic map of each abnormal household meter reported by each device, obtain, for any target abnormal household meter, a distance between the voltage harmonic map of the target abnormal household meter and each phase voltage harmonic map of each area, and find out a minimum distance, where a corresponding area of the minimum distance is an area to which the target abnormal household meter belongs, and a phase of a corresponding area of the minimum distance is a phase of a corresponding area to which the target abnormal household meter belongs.
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