CN-122026614-A - Topology identification method and system for low-voltage transformer area

CN122026614ACN 122026614 ACN122026614 ACN 122026614ACN-122026614-A

Abstract

The invention provides a topology identification method and system for a low-voltage transformer area, which comprises the steps that a transformer area gateway device configures frequency parameters, characteristic sequence parameters and criterion threshold parameters for topology identification, networking of low-voltage monitoring units is completed according to the network access state of a transformer area head node, the frequency parameters and the characteristic sequence parameters are issued to the low-voltage monitoring units through the transformer area gateway device, time synchronization is carried out on the low-voltage monitoring units, a main monitoring unit is selected, the main monitoring unit is controlled to inject characteristic current into a power grid, identification event information generated by other low-voltage monitoring units is acquired, step-by-step judgment is carried out on the identification event information based on the criterion threshold parameters, and the topology association relation between the main monitoring unit and the transformer area head node and the other low-voltage monitoring units is determined, so that the topology structure of the low-voltage transformer area is generated.

Inventors

WU SHUQI
SUN KAN
WANG YIJUN

Assignees

南京灵枢智联技术有限公司

Dates

Publication Date: 20260512
Application Date: 20260202

Claims (10)

1. A topology identification method of a low-voltage station area, which is applied to a low-voltage distribution system corresponding to the low-voltage station area and comprising station area gateway equipment and a plurality of low-voltage monitoring units, and is characterized in that the method comprises the following steps: configuring frequency parameters, characteristic sequence parameters and criterion threshold parameters for topology identification by the gateway equipment of the platform region, and completing networking of a low-voltage monitoring unit according to the network access state of a pre-configured head node of the platform region; Respectively issuing the frequency parameter and the characteristic sequence parameter to each low-voltage monitoring unit through the gateway equipment of the platform area, and performing time synchronization on each low-voltage monitoring unit; selecting a target low-voltage monitoring unit as a main monitoring unit, controlling the main monitoring unit to inject characteristic current into a power grid of the low-voltage power distribution system, and collecting identification event information generated after the other low-voltage monitoring units identify the characteristic current; Based on the criterion threshold parameters, carrying out step-by-step discrimination on the identification event information, and determining topological association relations between the main monitoring unit and the platform area head node and the rest low-voltage monitoring units respectively; And generating a topological structure of the low-voltage transformer area according to the topological association relation between the main monitoring unit and the transformer area head node and the rest low-voltage monitoring units respectively.
2. The method of claim 1, wherein the zone head node corresponds to an outgoing primary node of the low voltage zone, and the zone head node is one or more of the low voltage monitoring units.
3. The method of claim 1, wherein the frequency parameter is a set of mutually unequal and numerically ordered frequency sequences; The characteristic sequence parameter is a binary coding sequence for characterizing a characteristic current waveform.
4. The method of claim 1, wherein the completing the networking of all the low voltage monitoring units according to the network access status of the pre-configured head node of the station comprises: if the area head nodes which are not connected with the network exist, continuously waiting until all the area head nodes are connected with the network; If all the area head nodes are connected to the network, starting a waiting period of preset time and starting countdown, resetting the waiting period to the preset time and restarting countdown when a new low-voltage monitoring unit is connected to the network in the countdown process, and completing networking after the countdown is finished.
5. The method of claim 1, wherein selecting the target low pressure monitoring unit as the master monitoring unit comprises: And selecting a low-voltage monitoring unit which does not start topology identification from the plurality of low-voltage monitoring units, and if the low-voltage monitoring unit does not exist, selecting the low-voltage monitoring unit in a suspected state.
6. The method of claim 1, wherein the criteria threshold parameters include one or more of a noise threshold, a topology identification signal strength threshold, a topology identification time threshold, an injection current latency, a high noise latency, a maximum number of in-band noise checks, and a maximum number of suspicions that can be tolerated; the identification event information includes one or more of identification time, identification signal strength, identification noise value, identification current direction, and identification phase.
7. The method of claim 6, wherein the step-wise discriminating of the identified event information based on the criteria threshold parameter is performed in the following order: The time criterion is judged by reserving identification event information that the time difference between the identification time and the standard identification time does not exceed the topology identification time threshold according to the topology identification time threshold and the predetermined standard identification time, and discarding the rest; the optimal event screening, namely, only reserving a single event with optimal identification signal intensity for the identification event information reserved by a time criterion by each low-voltage monitoring unit; direction criterion discrimination, namely reserving identification event information of which the identification current direction meets the forward direction requirement according to a preset forward direction requirement, and discarding the rest; Judging signal intensity criteria, namely reserving identification event information with the identification signal intensity higher than a threshold according to the topology identification signal intensity threshold, and discarding the rest; the head node event screening, namely, for the identification event information reserved by the signal strength criterion, if a plurality of events corresponding to the head nodes exist, only reserving the head node event with optimal identification signal strength; Judging whether the head node event exists or not, if so, judging that the main monitoring unit is local area equipment, and if not, judging that the main monitoring unit is non-local area equipment and accumulating suspected times; and judging the noise criterion, namely if the identification noise value exceeds a preset reasonable range under the condition that the main monitoring unit is judged to be the local area equipment, marking the main monitoring unit as a suspicion state and accumulating suspicion times, and if the suspicion state is not exceeded, confirming the topological association relationship between the main monitoring unit and the low-voltage monitoring unit and the area head node where the identification event occurs.
8. A topology identification system of a low-voltage transformer area, which is applied to a low-voltage power distribution scene corresponding to the low-voltage transformer area, and is characterized by comprising: The networking module is used for configuring frequency parameters, characteristic sequence parameters and criterion threshold parameters for topology identification by the gateway equipment of the platform region, and completing networking of the low-voltage monitoring unit according to the networking state of the head node of the pre-configured platform region; the parameter configuration module is used for respectively issuing the frequency parameters and the characteristic sequence parameters to each low-voltage monitoring unit through the gateway equipment of the transformer area and carrying out time synchronization on each low-voltage monitoring unit; the system comprises a characteristic injection module, a characteristic detection module and a characteristic detection module, wherein the characteristic injection module is used for selecting a target low-voltage monitoring unit as a main monitoring unit, controlling the main monitoring unit to inject characteristic current into a power grid of a low-voltage power distribution system, and collecting identification event information generated after the other low-voltage monitoring units identify the characteristic current; The topology identification module is used for judging the identification event information step by step based on the criterion threshold value parameter and determining the topology association relation between the main monitoring unit and the platform area head node and the rest low-voltage monitoring units respectively; The structure generation module is used for generating the topological structure of the low-voltage station area according to the topological association relation between the main monitoring unit and the station area head node and the rest of low-voltage monitoring units respectively.
9. The system of claim 8, wherein the zone head node corresponds to an outgoing primary node of the low voltage zone, and the zone head node is one or more of the low voltage monitoring units.
10. The system of claim 8, wherein the networking module comprises: the node non-networking submodule is used for continuously waiting until all the area head nodes are networked when the area head nodes which are not networked exist; And the node network access submodule is used for starting a waiting period of preset time and starting countdown when all the area head nodes are accessed to the network, resetting the waiting period to the preset time and restarting the countdown when a new low-voltage monitoring unit is accessed to the network in the countdown process, and completing networking after the countdown is finished.

Description

Topology identification method and system for low-voltage transformer area Technical Field The invention relates to the technical field of power systems, in particular to a topology identification method and system for a low-voltage transformer area. Background At present, a low-voltage transformer area is taken as an end link of a power system and bears the task of distributing electric energy from a distribution transformer to a user ammeter, and the coverage range of the low-voltage transformer area comprises equipment such as overhead lines, cables, circuit breakers, the ammeter, a branch box and the like. With the acceleration of the urban process, the low-voltage transformer area presents the problems of rapid increase of equipment quantity, fuzzy topological relation, new energy access impact and the like, and brings barriers to line loss management, fault rush repair and new energy management. In the prior art, the topology identification is generally carried out on the low-voltage transformer area through injecting a single index of a specific current signal, so that the topology identification is inaccurate, and the problems of line loss intelligence, fault rush repair, new energy management blockage and the like are caused. Disclosure of Invention In order to solve the problem that in the prior art, when a single index is adopted to perform topology identification on a low-voltage area, the obtained topology structure is inaccurate, the invention provides a topology identification method of the low-voltage area, which is applied to a low-voltage power distribution system corresponding to the low-voltage area and comprising an area gateway device and a plurality of low-voltage monitoring units, and is characterized in that the method comprises the following steps: configuring frequency parameters, characteristic sequence parameters and criterion threshold parameters for topology identification by the gateway equipment of the platform region, and completing networking of a low-voltage monitoring unit according to the network access state of a pre-configured head node of the platform region; Respectively issuing the frequency parameter and the characteristic sequence parameter to each low-voltage monitoring unit through the gateway equipment of the platform area, and performing time synchronization on each low-voltage monitoring unit; selecting a target low-voltage monitoring unit as a main monitoring unit, controlling the main monitoring unit to inject characteristic current into a power grid of the low-voltage power distribution system, and collecting identification event information generated after the other low-voltage monitoring units identify the characteristic current; Based on the criterion threshold parameters, carrying out step-by-step discrimination on the identification event information, and determining topological association relations between the main monitoring unit and the platform area head node and the rest low-voltage monitoring units respectively; And generating a topological structure of the low-voltage transformer area according to the topological association relation between the main monitoring unit and the transformer area head node and the rest low-voltage monitoring units respectively. Optionally, the station area head node corresponds to an outgoing line primary node of the low-voltage station area, and the station area head node is one or more of the low-voltage monitoring units. Optionally, the frequency parameters are a group of mutually unequal and numerical ordered frequency sequences; The characteristic sequence parameter is a binary coding sequence for characterizing a characteristic current waveform. Optionally, the networking of all the low-voltage monitoring units is completed according to the network access state of the pre-configured platform head node, including: if the area head nodes which are not connected with the network exist, continuously waiting until all the area head nodes are connected with the network; If all the area head nodes are connected to the network, starting a waiting period of preset time and starting countdown, resetting the waiting period to the preset time and restarting countdown when a new low-voltage monitoring unit is connected to the network in the countdown process, and completing networking after the countdown is finished. Optionally, the selecting the target low-voltage monitoring unit as the main monitoring unit includes: And selecting a low-voltage monitoring unit which does not start topology identification from the plurality of low-voltage monitoring units, and if the low-voltage monitoring unit does not exist, selecting the low-voltage monitoring unit in a suspected state. Optionally, the criterion threshold parameters comprise one or more of a noise threshold, a topology identification signal strength threshold, a topology identification time threshold, an injection current waiting time, a high noise waiting time, a maxi