CN-122026300-A - Distributed energy power distribution network bearing capacity assessment method, system, equipment and medium based on digital twin

CN122026300ACN 122026300 ACN122026300 ACN 122026300ACN-122026300-A

Abstract

The invention relates to the technical field of power distribution network bearing capacity assessment, and discloses a digital twinning-based distributed energy power distribution network bearing capacity assessment method, a digital twinning-based distributed energy power distribution network bearing capacity assessment system, digital twinning-based distributed energy power distribution network bearing capacity assessment equipment and a digital twinning-based distributed energy power distribution network bearing capacity assessment medium. Or adjusting the acquisition frequency for the power distribution network based on the operation fluctuation characterization parameter. The method improves the accuracy of the power distribution network bearing capacity assessment, identifies bearing hidden danger in advance and ensures operation safety.

Inventors

Lin Yunxuan
GUO HUIFANG
ZHENG DING
ZHANG NA
DONG YUNZHOU
WU CHUNJI
LIN SHIZHE
Zhu Mingsi
CAO LU
XING BOXIANG
QI MINGLU

Assignees

海南电网有限责任公司信息通信分公司

Dates

Publication Date: 20260512
Application Date: 20251202

Claims (10)

1. The method for evaluating the bearing capacity of the distributed energy power distribution network based on digital twinning is characterized by comprising the steps of obtaining working state data of the power distribution network, and extracting conventional working characteristics of a plurality of access points, wherein the conventional working characteristics comprise the maximum difference value of running power fluctuation and the distance between the corresponding access points; Calculating operation fluctuation characterization parameters aiming at the power distribution network by combining the conventional working characteristics and the operation overlapping time length of each access point so as to divide the operation fluctuation degree category of the power distribution network; according to the division result, selecting and calling the bearing evaluation or the acquisition adjustment; The load bearing evaluation comprises the steps of constructing a power time domain change curve of an access point corresponding to a power distribution network, determining a high-strength operation time domain segment, and evaluating a load bearing stability degree representation value of the power distribution network based on the operation state characteristics of the access point related to the high-strength operation time domain segment to judge whether the power distribution network accords with a load bearing fluctuation reference or not; The acquisition adjustment adjusts the acquisition frequency for the power distribution network based on the operation fluctuation characterization parameter; Locking a fluctuation access point, and identifying the number of branch lines of the fluctuation access point and the total operation duration in a preset time to judge whether the fluctuation access point is an interference access point or not; Marking the interference access point and sending out an early warning prompt signal.
2. A method of evaluating the load capacity of a distributed energy power distribution network based on digital twinning according to claim 1, wherein said calculating operational fluctuation characterizing parameters for the power distribution network comprises: taking the sum of the ratio of the maximum difference value of the operation power fluctuation to the maximum difference value threshold value of the operation power fluctuation and the ratio of the distance between the corresponding access points to the distance threshold value as a first operation fluctuation characteristic; Taking the ratio of the operation overlapping time length of each access point to the operation overlapping time length threshold value as a second operation fluctuation feature; and carrying out weighted summation on the first operation fluctuation characteristic and the second operation fluctuation characteristic as the operation fluctuation characteristic parameter.
3. The method for evaluating the bearing capacity of the distributed energy power distribution network based on digital twinning according to claim 2, wherein the classification of the operation fluctuation degree of the power distribution network comprises the following steps: If the operation fluctuation characteristic parameter of the power distribution network is greater than or equal to the operation fluctuation characteristic parameter threshold, classifying the operation fluctuation degree of the power distribution network into a strong operation fluctuation degree class; and if the operation fluctuation characteristic parameter of the power distribution network is smaller than the operation fluctuation characteristic parameter threshold, classifying the operation fluctuation degree category of the power distribution network into a weak operation fluctuation degree category.
4. The method for evaluating the bearing capacity of a distributed energy power distribution network based on digital twinning according to claim 3, wherein constructing a power time domain change curve of a power distribution network corresponding to an access point, and determining a high-strength operation time domain segment comprises: if any time domain segment exists and meets the high-strength operation condition, determining the time domain segment as the high-strength operation time domain segment; the high-intensity operation condition comprises a time domain section which has actual operation power larger than rated operation power by a preset proportion and continuously operates for not less than a preset time length as the high-intensity operation time domain section.
5. The method for evaluating the bearing capacity of a distributed energy power distribution network based on digital twinning according to claim 4, wherein evaluating the bearing stability degree characterization value of the power distribution network based on the operation state characteristics of the access points involved in the high-intensity operation time domain segment to determine whether the power distribution network meets a bearing fluctuation reference comprises: Taking the ratio of the difference value between the actual operating power and the rated operating power to the power difference value threshold value as a first bearing stability characteristic; Taking the ratio of the average adjacent distance between the access points to the average adjacent distance threshold value as a second bearing stable characteristic; Taking the sum of the first bearing stability characteristic and the second bearing stability characteristic as the bearing stability degree representation value; And if the load bearing stability degree representation value of the power distribution network is smaller than the load bearing stability degree representation threshold, judging that the power distribution network does not accord with the load bearing fluctuation reference.
6. The method for evaluating the bearing capacity of a distributed energy power distribution network based on digital twinning as recited in claim 5, wherein adjusting the acquisition frequency for said power distribution network based on said operational fluctuation characterizing parameter comprises increasing the acquisition frequency for said power distribution network by an amount that is positively correlated with the operational fluctuation characterizing parameter.
7. The method for evaluating the bearing capacity of a distributed energy power distribution network based on digital twinning according to claim 6, wherein the locking fluctuation access point comprises: Invoking power fluctuation frequency of a plurality of access points related to a high-strength operation time domain section; the power fluctuation frequencies are arranged in a descending order; Taking an access point corresponding to the head of the column as the fluctuation access point; The determining whether the fluctuating access point is an interfering access point includes: if any fluctuation access point does not accord with the access operation condition, judging the fluctuation access point as an interference access point; The access operation condition comprises that the number of branch lines of the fluctuation access point is identified to be smaller than a threshold value of the number of branch lines, and the total operation duration in the preset time is identified to be smaller than a threshold value of the total operation duration.
8. A distributed energy distribution network bearing capacity assessment system based on digital twinning, applying the method according to any one of claims 1-7, comprising: The system comprises an operation acquisition module, a control module and a control module, wherein the operation acquisition module is used for acquiring the working state data of a power distribution network and extracting the conventional working characteristics of a plurality of access points, wherein the conventional working characteristics comprise the maximum difference value of operation power fluctuation and the distance between the corresponding access points; the fluctuation analysis module is used for calculating operation fluctuation characterization parameters aiming at the power distribution network by combining the conventional working characteristics and the operation overlapping time length of each access point so as to divide the operation fluctuation degree category of the power distribution network; the evaluation calling module is used for selecting and calling the bearing evaluation or the acquisition adjustment according to the division result of the fluctuation analysis module; The load bearing evaluation module is used for evaluating and analyzing the operation load bearing of the power distribution network, and comprises the steps of constructing a power time domain change curve of a power distribution network corresponding to an access point, determining a high-strength operation time domain segment, and evaluating a load bearing stability degree representation value of the power distribution network based on the operation state characteristics of the access point related to the high-strength operation time domain segment so as to judge whether the power distribution network accords with a load bearing fluctuation reference; The operating state characteristics comprise the difference value between the actual operating power and the rated operating power and the average adjacent distance between the access points; The acquisition adjustment module is used for adjusting the acquisition frequency aiming at the power distribution network based on the operation fluctuation characterization parameters; the depth locking module is used for locking the fluctuation access point, identifying the number of branch lines of the fluctuation access point and the total operation duration in the preset time to judge whether the fluctuation access point is an interference access point or not; and the marking early warning module is used for marking the interference access point and sending out an early warning prompt signal.
9. A computer device, comprising: A memory and a processor; The memory is configured to store computer executable instructions, and the processor is configured to execute the computer executable instructions, which when executed by the processor, implement the steps of a digital twin based distributed energy distribution network load capacity assessment method according to any one of claims 1 to 7.
10. A computer readable storage medium, characterized in that it stores computer executable instructions, which when executed by a processor, implement the steps of a digital twin based distributed energy distribution network load capacity assessment method according to any one of claims 1 to 7.

Description

Distributed energy power distribution network bearing capacity assessment method, system, equipment and medium based on digital twin Technical Field The invention relates to the technical field of power distribution network bearing capacity evaluation, in particular to a digital twin-based distributed energy power distribution network bearing capacity evaluation method, a system, equipment and a medium. Background The distribution network is used as a key link for connecting the centralized energy source and the terminal user, and the bearing capacity of the distribution network directly determines the consumption efficiency of the distributed energy source and the safety and stability of the operation of the power network. Under the distributed energy access scene, the running state of the power distribution network presents the characteristics of strong fluctuation, randomness and complexity, namely the output of the distributed power supply is obviously influenced by natural conditions, the problems of voltage fluctuation, frequency deviation, three-phase imbalance and the like of the power distribution network are easily caused, and the load distribution and the energy flow direction of the power distribution network are radically changed due to the scattered layout of a large number of distributed energy access points, so that the traditional power distribution network load bearing evaluation method based on the centralized power supply is difficult to adapt. In addition, the dynamic fluctuation characteristic of the distributed energy source requires that the bearing capacity assessment system has real-time response and dynamic adjustment capability, and the traditional assessment method has obvious limitations on timeliness, accuracy and adaptability. Under the background, the power distribution network bearing capacity evaluation system integrating the digital twin technology and the multidimensional operation data becomes a key technical direction for solving the bearing problem caused by the distributed energy access and ensuring the safe and stable operation of the power distribution network. CN115062975A discloses a method, a system and a storage medium for analyzing the carrying capacity of a regional multi-energy system, wherein the method comprises the steps of carrying out system operation simulation on a given evaluation period based on a digital twin model, calculating the maximum reverse load rate of the system according to simulation results, judging whether the maximum reverse load rate is larger than a preset threshold value, if the maximum reverse load rate is larger than the preset threshold value, the system operation is at risk, not suggesting to be connected with a distributed power supply, and if the maximum reverse load rate is smaller than or equal to the preset threshold value, obtaining the short-circuit current, voltage deviation, harmonic wave and three-phase unbalance rate of each bus of the system according to the simulation results, and if the short-circuit current, voltage deviation, harmonic wave and three-phase unbalance rate of each bus meet the corresponding preset limit value requirements, the distributed power supply can be normally connected with a grid, the distributed power supply can be newly increased, and the economical efficiency and the power supply quality of the regional multi-energy system are improved. However, the following problems still exist in the prior art, and the stable operation characteristics of the centralized power supply are mostly based on offline simulation and static indexes, such as rated capacity of equipment and fixed power flow distribution. However, the distributed energy output is obviously influenced by natural conditions, instantaneous severe fluctuation of the voltage and the power of the power distribution network is easy to cause, the dynamic fluctuation characteristics cannot be captured in real time by the traditional method, the real-time influence of fluctuation on the bearing capacity is difficult to quantify, the evaluation result is disjointed with the actual running state of the power distribution network, and the real bearing risk cannot be accurately reflected. Disclosure of Invention The present invention has been made in view of the above-described problems occurring in the prior art. Therefore, the invention provides a method and a system for evaluating the bearing capacity of a distributed energy power distribution network based on digital twinning, which solve the problems that the existing method and system cannot capture the dynamic fluctuation characteristics of the instantaneous severe fluctuation of the voltage and the power of the power distribution network in real time, which are obvious in influence of natural conditions, are easy to cause, further the real-time influence of fluctuation on the bearing capacity is difficult to quantify, the evaluation result is disjointed with the actual running state o