CN110601363B - Station area branch identification method and system based on sinusoidal current disturbance - Google Patents
Station area branch identification method and system based on sinusoidal current disturbance Download PDFInfo
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Abstract
The invention relates to the technical field of power system detection, in particular to a station branch identification method and a station branch identification system based on sinusoidal current disturbance, wherein the method comprises a disturbance loading step, a disturbance detection step and a topology structure calculation step, and the method specifically comprises the following steps: the central node controls the target branch node to send a disturbance current signal at a specified preset time, wherein the disturbance current signal is a low-frequency sinusoidal disturbance current signal of 1-100 kHz; the branch node detects a disturbance current signal at preset time and feeds back a detection result to the central node; and the central node calculates the topological structure of the to-be-detected area according to the detection result. The method and the system for identifying the branch of the station area based on sinusoidal current disturbance provided by the invention have the advantages that the influence on power grid equipment is avoided, and the identification of the branch of the station area can be realized stably, accurately and rapidly.
Description
Technical Field
The invention relates to the technical field of power system detection, in particular to a station branch identification method and system based on sinusoidal current disturbance.
Background
Electric energy always plays a role in the energy pattern, and the intellectualization and informatization of a power grid system are important for further playing the role of electric energy and effectively utilizing the electric energy. However, there are many urgent problems to be solved in the process of intelligence and informatization, in which the topology of the power grid (especially the low-voltage transformer area) is always a difficult problem for rapid development. The low-voltage station users can use electricity quickly and conveniently, the wiring is quite random, the wiring is not carried out according to the regulations of related departments, even some users have two household wires of different station areas, and the large access of the actual electricity consumption of the users and the data of the branch summary table is caused. Secondly, because of various random connection and random lap joint, great potential safety hazard is brought to personal safety of power maintenance personnel to a certain extent. Therefore, in order to realize consumption reduction and loss reduction by the electricity management department, an accurate and dynamic knowledge of the whole topological structure of the transformer area is required to realize the refined, accurate and comprehensive management of the transformer area.
To accurately describe the topology of a low voltage area, it is first determined whether a system node is a target area or not, and if so, which phase it belongs to. Second, after determining all nodes and corresponding phase powers of a certain target area, it is necessary to further determine the topological relationship between all system nodes. The traditional station branch identification systems all adopt a power line carrier two-way communication mode, and the method has the advantages that the existing network can be directly utilized without upgrading on the system, and the operation is simple and convenient. Meanwhile, the system has a fatal weakness that firstly, the power communication system is quite complex, noise and line impedance of the system are different in different periods, attenuation of carrier signals is uneven, and therefore long-distance transmission cannot be carried out stably. And secondly, because the power line carrier communication mostly adopts high-frequency carrier signals, the high-frequency carrier signals are coupled to a high-voltage side through a distribution transformer and then transmitted to adjacent distribution transformers through high-voltage wires, and therefore, the accuracy problem exists in the identification of the distribution transformer areas of the adjacent distribution transformers sharing high voltages, sharing grounds and sharing cable trenches. The other scheme adopts a specific large pulse current mode to carry out the branch identification of the station area, and of course, the scheme has no problem of cross wire, and can improve the accuracy problem of the station area identification to a certain extent. However, the greatest disadvantage is that a long-term short-time high current may cause damage to the equipment and the system, which intangibly increases the burden and cost of the system, and is instead irreparable. In view of this, it is a difficult problem how to compromise the stability of the system equipment and the accuracy of the station branch identification.
Disclosure of Invention
The invention aims to provide a station branch identification method based on sinusoidal current disturbance and a station branch identification system based on sinusoidal current disturbance, which can stably, accurately and rapidly realize the identification of the station branch.
In order to solve the technical problems, the application provides the following technical scheme:
a station branch identification method based on sinusoidal current disturbance comprises the following steps: a disturbance loading step, wherein a central node controls a target branch node to send a disturbance current signal at a specified preset time, wherein the disturbance current signal is a low-frequency sinusoidal disturbance current signal of 1-100 kHz; a disturbance detection step, namely detecting a disturbance current signal at preset time by a branch node, and feeding back a detection result to a central node; and a topology structure calculation step, wherein the central node calculates the topology structure of the to-be-detected area according to the detection result.
In the technical scheme of the invention, the low-frequency sinusoidal disturbance current signal is used for carrying out the branch identification of the station area instead of the original large-current pulse signal, so that the influence on power grid equipment can be avoided; ensuring the stability of the operation of the equipment. The frequency of the disturbance current signal is too high to cause mutual coupling between low-voltage transformer areas, and the too low frequency can generate a coupling effect on a high-voltage side, so that the accuracy of the identification result can be reduced to a certain extent; the high-frequency signal of megahertz level is easily influenced by the equivalent capacitance in the actual power grid load circuit, so that the actual situation deviates from the expectations to a great extent; the method adopts the frequency of 1-100kHz to make the disturbance current signal, the sine wave wavelength of the disturbance current signal of 1-100kHz is 3-300km in the theoretical length of vacuum, and the method is sufficient for covering low-voltage areas of almost all scales, so that the noise influence can be reduced, the signal transmission quality can be ensured, the disturbance current signal can be ensured to be effectively covered on the whole area, and the detection accuracy can be ensured. Because the central node can broadcast the time of sending disturbance by the designated branch node, the disturbance current signal can theoretically occur at any moment, and the disturbance current signal does not need to occur at the zero crossing point moment of the voltage like the traditional large-current pulse signal, so that the condition of waiting for the zero crossing moment can be avoided, the detection efficiency can be improved, the corresponding voltage zero crossing circuit detection circuit is not needed, and the cost is reduced.
Further, the disturbance loading step includes:
s100: the center node selects one node of the target branch nodes as a current target branch node;
s200: the central node broadcasts the node number of the current target branch node and designates the preset time for sending the disturbance current signal;
s300: the branch node judges whether the branch node is a current target branch node according to the node number, and the current target branch node sends a disturbance current signal at preset time after receiving the broadcast;
the disturbance detection step comprises the following steps:
s400: the branch node detects disturbance current signals at preset time, and feeds back detection results to the central node when the disturbance current signals are detected;
s500: and if the central node receives the detection result corresponding to the current target branch node, selecting other branch nodes which are not notified as the current target branch node, and repeatedly executing S200 to S500 until the detection results corresponding to all the target branch nodes are received.
The central node is used for actively controlling each target branch node to send disturbance current signals one by one, so that the branch nodes can be orderly and efficiently detected.
Further, the disturbance current signal is a low-frequency sinusoidal disturbance current signal of 10 kHz.
The 10kHz sine wave wavelength lambda is 30km in the theoretical length of the vacuum, and its equivalent wavelength is about 10km, considering the complex path and round trip of the actual power line, sufficient to cover the entire low voltage area.
Further, in S400, the branch node feeds back the detection result to the central node through power line carrier communication.
The power line carrier communication is a well-established communication technology at present, and data transmission between the branch node and the central node is carried out by means of the power line carrier communication, so that the method is simple and convenient.
Further, in S500, if the central node does not receive the detection result of the corresponding current target branch node, the central node maintains the current target branch node, and repeatedly executes S200 to S500 until the detection result of the corresponding current branch node is received or the maximum retry number is reached, and then selects other branch nodes which are not notified as the current target branch node, and repeatedly executes S200 to S500 until the detection results corresponding to all the target branch nodes are received.
The failure of information transmission caused by unstable communication is avoided, and the center node can perform multiple message transmission on the branch nodes which are not fed back successfully through retry, so that the corresponding detection result is ensured to be acquired.
Further, S100 further includes, before:
s10: the central node identifies the station area and the phase line, and screens the branch node of the target station area as a target branch node.
Through the identification of the station areas and the phase lines, the corresponding target branch nodes can be screened out, and the station areas to be detected are detected only.
Further, the detection result includes a phase characteristic of the disturbance current signal, and in the topology calculation step, the center node judges the topology of the branch node, including the following steps:
and the central node judges whether the disturbance current signal detected by the branch node is in phase with the current target branch node according to the detection result sent by the branch node, if so, the branch node is judged to be the father node of the current target branch node.
And according to the phase of the low-frequency disturbance current signal, judging the loop relation among the branch nodes, and calculating the topological structure relation of the whole to-be-detected area through the relation among the nodes.
The invention further discloses a station branch identification system based on sinusoidal current disturbance, which comprises:
the system comprises a central node and branch nodes, wherein a disturbance current signal generation and detection module is arranged on the branch nodes and comprises a disturbance current signal transmitting unit, a time unit and a disturbance current detection unit;
the central node is used for informing the target branch node to sequentially send disturbance current signals according to the designated preset time; the disturbance current signal is a low-frequency sinusoidal disturbance current signal of 1-100 kHz;
the time unit is used for recording time;
the disturbance current signal transmitting unit is used for transmitting a disturbance current signal at a preset time appointed by the center node after receiving notification information of the center node;
the disturbance current detection unit is used for detecting a disturbance current signal at a preset time appointed by the central node and feeding back a detection result to the central node;
the center node is also used for receiving the detection results sent by the branch nodes and calculating the topology structure of the to-be-detected area according to the detection results.
The disturbance current signal generation and detection module is used for carrying out the branch identification of the station area by replacing the original large current pulse signal with the low-frequency sinusoidal disturbance current signal, so that the influence on power grid equipment can be avoided; ensuring the stability of the operation of the equipment. The frequency of the disturbance current signal is too high to cause mutual coupling between low-voltage transformer areas, and the too low frequency can generate a coupling effect on a high-voltage side, so that the accuracy of the identification result can be reduced to a certain extent; the high-frequency signal of megahertz level is easily influenced by the equivalent capacitance in the actual power grid load circuit, so that the actual situation deviates from the expectations to a great extent; the disturbance current signal is made by adopting the frequency of 1-100kHz, so that the noise influence can be reduced, the signal transmission quality is ensured, the disturbance current signal can be effectively covered on the whole platform area, and the detection accuracy is ensured. Because the central node can broadcast the time of sending disturbance by the designated branch node, the disturbance current signal can theoretically occur at any moment, and the disturbance current signal does not need to occur at the zero crossing point moment of the voltage like the traditional large-current pulse signal, so that the condition of waiting for the zero crossing moment can be avoided, the detection efficiency can be improved, the corresponding voltage zero crossing circuit detection circuit is not needed, and the cost is reduced.
Further, the disturbance current signal generation and detection module further comprises a platform area feedback unit and a phase line feedback unit, the central node comprises a platform area identification unit and a phase line identification unit, the platform area feedback unit and the phase line feedback unit are used for sending platform area information and phase line information of a branch node where the central node is located to the central node, the platform area identification unit and the phase line identification unit are used for identifying the platform area and the phase line according to the platform area information and the phase line information, and the central node is further used for screening out the branch node of the target platform area according to the platform area and the phase line to serve as a target branch node.
And by acquiring the platform region information and the phase line information, the central node can conveniently screen the target branch node.
Further, the disturbance current signal generating and detecting module comprises a carrier communication unit, and the branch node receives notification information of the central node through the carrier communication unit, sends station area information, phase line information and a detection result to the central node.
The carrier communication unit can be used for carrying out data transmission between the branch node and the central node through power line carrier communication, and the method is simple and convenient.
Drawings
Fig. 1 is a flowchart of an embodiment of a method for identifying a branch of a station based on sinusoidal current disturbance according to the present invention.
Detailed Description
The following is a further detailed description of the embodiments:
example 1
The embodiment provides a station area branch identification system based on sinusoidal current disturbance, which comprises a central node and branch nodes, wherein disturbance current signal generation and detection modules are arranged on the branch nodes, and each disturbance current signal generation and detection module comprises a carrier communication unit, a station area feedback unit, a phase line feedback unit, a disturbance current signal transmitting unit, a time unit and a disturbance current detection unit; the time unit is used for recording time; the disturbance current signal transmitting unit is used for transmitting a disturbance current signal at a designated preset time after receiving notification information of the central node; the disturbance current detection unit is used for detecting a disturbance current signal at a preset time appointed by the central node and feeding back a detection result to the central node. The central node is used for informing the target branch node to sequentially send disturbance current signals according to the appointed preset time; the disturbance current signal is a low-frequency sinusoidal disturbance current signal of 1-100 kHz; the central node is also used for receiving the detection results sent by the branch nodes and calculating the topology structure of the to-be-detected platform area according to the detection results. The communication between the branch node and the central node comprises the steps of receiving notification information of the central node, sending platform area information, phase line information and detection results to the central node, and is realized through a carrier communication unit.
The central node comprises a platform area identification unit and a phase line identification unit, the platform area feedback unit and the phase line feedback unit are used for sending platform area information and phase line information of a branch node where the central node is located to the central node, the platform area identification unit and the phase line identification unit are used for identifying the platform area and the phase line according to the platform area information and the phase line information, and the central node is also used for screening out the branch node of the target platform area according to the platform area and the phase line to serve as a target branch node.
In the embodiment, the disturbance current signal generation and detection module adopts a special chip module supporting carrier communication, in particular a WQ3011 power line carrier communication chip, and the chip module supports a platform area identification function and a phase line identification function and is used for sending platform area information and phase line information to a central node, so that the central node can conveniently and quickly determine all branch nodes of a certain low-voltage platform area, and can generate a low-frequency sinusoidal disturbance current signal of 10kHz under the signal control of the central node; the chip module comprises a disturbance current detection circuit, wherein the disturbance current detection circuit is used for detecting a low-frequency disturbance current signal and acquiring phase information of the low-frequency disturbance current signal.
Specifically, in this embodiment, the disturbance current signal is a low-frequency sinusoidal disturbance current signal of 10 kHz. The 10kHz sine wave wavelength λ is 30km in the theoretical length of the vacuum, and its equivalent wavelength is about 10km, considering the complex channels and round trips of the actual power line, even a quarter wavelength, i.e. λ/4=2.5 km, is sufficient to cover the whole low voltage area.
As shown in fig. 1, a method for identifying a branch of a station based on sinusoidal current disturbance according to the present embodiment is based on the above system, and includes:
a disturbance loading step, wherein a central node controls a target branch node to send a disturbance current signal at a specified preset time, wherein the disturbance current signal is a low-frequency sinusoidal disturbance current signal of 1-100 kHz;
a disturbance detection step, namely detecting a disturbance current signal at preset time by a branch node, and feeding back a detection result to a central node;
and a topology structure calculation step, wherein the central node calculates the topology structure of the to-be-detected area according to the detection result.
Specifically, the disturbance loading step includes:
s10: the central node identifies the station area and the phase line, screens the branch nodes of the target station area as target branch nodes, and screens the node numbers of the target branch nodes.
S100: the center node selects one node of the target branch nodes as a current target branch node;
s200: the central node broadcasts the node number of the current target branch node and designates the preset time for sending the disturbance current signal;
s300: the branch node judges whether the branch node is a current target branch node according to the node number, and the current target branch node sends a disturbance current signal at preset time after receiving the broadcast;
the disturbance detection step comprises the following steps:
s400: the branch node detects disturbance current signals at preset time, and feeds back detection results to the central node when the disturbance current signals are detected; the detection result includes a phase characteristic of the disturbance current signal.
S500: and if the central node receives the detection result corresponding to the current target branch node, selecting other branch nodes which are not notified as the current target branch node, and repeatedly executing S200 to S500 until the detection results corresponding to all the target branch nodes are received. If the central node does not receive the detection result of the corresponding current target branch node, the central node keeps the current target branch node, repeatedly executes S200 to S500 until the detection result of the corresponding current branch node is received or the maximum retry number is reached, selects other branch nodes which are not notified as the current target branch node, and repeatedly executes S200 to S500 until the detection results corresponding to all the target branch nodes are received.
In the topology structure calculation step, when the central node judges the topology structure of the branch node, the central node judges according to the following principle:
if one branch node is the parent of the current target branch node, the disturbance current signal it detects is in phase with the current target branch node, and if one branch node is a child or sibling of the current target branch node, the disturbance current signal it detects is in phase with the current target branch node.
Correspondingly, the central node judges the topological structure of the branch node specifically comprises the following steps:
the central node judges whether the disturbance current signal detected by the branch node is in phase with the current target branch node according to the detection result sent by the branch node, if so, the branch node is judged to be a father node of the current target branch node;
and the central node perfects the topological structure calculated before according to the detection result.
And according to the phase of the low-frequency disturbance current signal, judging the loop relation among the branch nodes, and calculating the topological structure relation of the whole to-be-detected area through the relation among the nodes.
Example two
The difference between this embodiment and the first embodiment is that the low-frequency disturbance current signal in this embodiment is a sinusoidal current signal of 9 kHz.
Example III
The difference between this embodiment and the first embodiment is that in this embodiment, the low-frequency disturbance current signal is a sinusoidal current signal of 11 kHz.
Example IV
The difference between the present embodiment and the first embodiment is that the low-frequency disturbance current signal in the present embodiment is a sinusoidal current signal of 1 kHz.
Example five
The difference between the present embodiment and the first embodiment is that in the present embodiment, a sinusoidal current signal of 100kHz is used as the low-frequency disturbance current signal.
The foregoing is merely an embodiment of the present invention, the present invention is not limited to the field of this embodiment, and the specific structures and features well known in the schemes are not described in any way herein, so that those skilled in the art will know all the prior art in the field before the application date or priority date, and will have the capability of applying the conventional experimental means before the date, and those skilled in the art may, in light of the teaching of this application, complete and implement this scheme in combination with their own capabilities, and some typical known structures or known methods should not be an obstacle for those skilled in the art to practice this application. It should be noted that modifications and improvements can be made by those skilled in the art without departing from the structure of the present invention, and these should also be considered as the scope of the present invention, which does not affect the effect of the implementation of the present invention and the utility of the patent. The protection scope of the present application shall be subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.
Claims (6)
1. A station branch identification method based on sinusoidal current disturbance is characterized by comprising the following steps: comprising the following steps:
a disturbance loading step, wherein a central node controls a target branch node to send a disturbance current signal at a specified preset time, wherein the disturbance current signal is a low-frequency sinusoidal disturbance current signal of 1-100 kHz;
a disturbance detection step, namely detecting a disturbance current signal at preset time by a branch node, and feeding back a detection result to a central node;
a topology structure calculation step, wherein the central node calculates the topology structure of the to-be-detected area according to the detection result;
the disturbance loading step comprises the following steps:
s100: the center node selects one node of the target branch nodes as a current target branch node;
s200: the central node broadcasts the node number of the current target branch node and designates the preset time for sending the disturbance current signal;
s300: the branch node judges whether the branch node is a current target branch node according to the node number, and the current target branch node sends a disturbance current signal at preset time after receiving the broadcast;
the disturbance detection step comprises the following steps:
s400: the branch node detects disturbance current signals at preset time, and feeds back detection results to the central node when the disturbance current signals are detected;
s500: if the central node receives the detection result corresponding to the current target branch node, selecting other branch nodes which are not notified as the current target branch node, and repeatedly executing S200 to S500 until the detection results corresponding to all the target branch nodes are received;
in the step S400, the branch node feeds back a detection result to the central node through power line carrier communication;
also included before S100 is:
s10: the central node identifies the station area and the phase line, and screens the branch node of the target station area as a target branch node.
2. The method for identifying a branch of a station based on sinusoidal current disturbance according to claim 1, wherein the method comprises the steps of: the disturbance current signal is a low-frequency sinusoidal disturbance current signal of 10 kHz.
3. The method for identifying a branch of a station based on sinusoidal current disturbance according to claim 1, wherein the method comprises the steps of: in S500, if the central node does not receive the detection result of the corresponding current target branch node, the central node maintains the current target branch node, and repeatedly executes S200 to S500 until the detection result of the corresponding current branch node is received or the maximum retry number is reached, and then selects other branch nodes which are not notified as the current target branch node, and repeatedly executes S200 to S500 until the detection results corresponding to all the target branch nodes are received.
4. The method for identifying a branch of a station based on sinusoidal current disturbance according to claim 1, wherein the method comprises the steps of: the detection result comprises the phase characteristics of disturbance current signals, and in the topology structure calculation step, the central node judges the topology structure of the branch node and comprises the following steps:
and the central node judges whether the disturbance current signal detected by the branch node is in phase with the current target branch node according to the detection result sent by the branch node, if so, the branch node is judged to be the father node of the current target branch node.
5. A station branch identification system based on sinusoidal current disturbance is characterized in that: comprising the following steps:
the system comprises a central node and branch nodes, wherein a disturbance current signal generation and detection module is arranged on the branch nodes and comprises a disturbance current signal transmitting unit, a time unit and a disturbance current detection unit;
the central node is used for informing the target branch node to sequentially send disturbance current signals according to the designated preset time; the disturbance current signal is a low-frequency sinusoidal disturbance current signal of 1-100 kHz;
the time unit is used for recording time;
the disturbance current signal transmitting unit is used for transmitting a disturbance current signal at a preset time appointed by the center node after receiving notification information of the center node;
the disturbance current detection unit is used for detecting a disturbance current signal at a preset time appointed by the central node and feeding back a detection result to the central node;
the center node is also used for receiving the detection results sent by the branch nodes and calculating the topology structure of the to-be-detected platform area according to the detection results;
the disturbance current signal generation and detection module further comprises a platform region feedback unit and a phase line feedback unit, the central node comprises a platform region identification unit and a phase line identification unit, the platform region feedback unit and the phase line feedback unit are used for sending platform region information and phase line information of a branch node where the central node is located to the central node, the platform region identification unit and the phase line identification unit are used for identifying the platform region and the phase line according to the platform region information and the phase line information, and the central node is further used for screening out the branch node of the target platform region according to the platform region and the phase line to serve as a target branch node.
6. A sinusoidal current disturbance based station branch identification system according to claim 5 and wherein: the disturbance current signal generation and detection module comprises a carrier communication unit, and the branch node receives notification information of the central node through the carrier communication unit, sends station area information, phase line information and a detection result to the central node.
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| CN112688309B (en) * | 2020-12-14 | 2023-05-09 | 国网河北省电力有限公司电力科学研究院 | Branch topology construction method and device applied to power distribution network |
| CN112688310B (en) * | 2020-12-14 | 2024-01-09 | 国网河北省电力有限公司电力科学研究院 | Line loss analysis method and device applied to power distribution network |
| CN112737128B (en) * | 2021-02-01 | 2024-03-01 | 苏州门海微电子科技有限公司 | Alternating current chopper-based station division branch topology identification method |
| CN113608024A (en) * | 2021-07-23 | 2021-11-05 | 威胜信息技术股份有限公司 | Low-voltage transformer area line impedance measurement method and system based on electric power special edge computing chip |
| CN114221336B (en) * | 2021-12-16 | 2023-03-24 | 重庆物奇科技有限公司 | Method and device for identifying platform area topology and storage medium |
| CN114243924B (en) * | 2021-12-21 | 2023-01-10 | 重庆物奇科技有限公司 | Transformer area topology identification method and system based on current signal detection |
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