CN-121983976-A - Photovoltaic overvoltage platform area private line transformation method, system, equipment and medium

CN121983976ACN 121983976 ACN121983976 ACN 121983976ACN-121983976-A

Abstract

The invention belongs to the technical field of power systems and discloses a method, a system, equipment and a medium for modifying a special line of a photovoltaic overvoltage platform, wherein the method comprises the steps of constructing a distributed photovoltaic access scene of a future period by utilizing a random sampling method based on power load parameters and distributed photovoltaic parameters of each node, and calculating photovoltaic overvoltage conditions of a photovoltaic overvoltage typical period of a typical day corresponding to the distributed photovoltaic access scene; and planning a photovoltaic special line erection scheme for each distributed photovoltaic access scene based on the photovoltaic overvoltage condition of the photovoltaic overvoltage in a typical day period, and taking the union of the photovoltaic special line erection schemes in all the distributed photovoltaic access scenes as a photovoltaic special line reconstruction scheme for the distributed photovoltaic access in a future period. According to the method, the future photovoltaic access scene is generated, the special line is preferably erected aiming at the most serious node of the overvoltage, and the voltage level is verified by iteration, so that the problem of the overvoltage in the future scene is thoroughly treated with the minimum economic investment.

Inventors

YU HAIDONG
LI LISHENG
XU DING
LIU YANG
WANG FENG
HUANG MIN
LIU WENBIN
WU YING
ZHOU CHENGHAN
HE BANGWEI
YIN ZIYANG

Assignees

国网山东省电力公司电力科学研究院

Dates

Publication Date: 20260505
Application Date: 20251209

Claims (16)

1. The method for modifying the special line of the photovoltaic overvoltage platform area is characterized by comprising the following steps of: acquiring power load parameters and distributed photovoltaic parameters of each node in a photovoltaic overvoltage typical day typical period; based on the power load parameters and the distributed photovoltaic parameters of each node, constructing a distributed photovoltaic access scene of a future period by utilizing a random sampling method, and calculating photovoltaic overvoltage conditions of a photovoltaic overvoltage typical day typical period corresponding to the distributed photovoltaic access scene; planning a photovoltaic special line erection scheme for each distributed photovoltaic access scene based on photovoltaic overvoltage conditions of photovoltaic overvoltage in typical day typical period; and taking the union of the photovoltaic special line erection schemes under all the distributed photovoltaic access scenes as a photovoltaic special line reconstruction scheme for the distributed photovoltaic access in the future period.
2. The method for modifying a dedicated line for a photovoltaic overvoltage platform according to claim 1, wherein the electrical load parameters and the distributed photovoltaic parameters for each node comprise active power, reactive power of the electrical load for each node and active power of the distributed photovoltaic for each node.
3. The method for modifying a photovoltaic overvoltage platform area private line according to claim 1, wherein the constructing a future period of distributed photovoltaic access scene by using a random sampling method based on the power load parameters and the distributed photovoltaic parameters of each node, and calculating photovoltaic overvoltage conditions of a photovoltaic overvoltage typical day typical period corresponding to the distributed photovoltaic access scene comprises: Acquiring photovoltaic installation-reporting willingness data of power users at each node in a platform area, and evaluating the probability of adding distributed photovoltaics to each node in a future period based on the photovoltaic installation-reporting willingness data of the power users; Under the condition that the injection power increment generated in the typical period of the photovoltaic overvoltage is in normal distribution, randomly sampling the target node to determine whether the target node in the future period is additionally provided with distributed photovoltaic; Screening nodes added with distributed photovoltaic, and determining newly-increased injection power of the nodes added with the distributed photovoltaic in a typical period of photovoltaic overvoltage typical days according to normal distribution sampling; adding the newly added injection power with the active power of each node at present, and calculating the active power and reactive power of each node in a photovoltaic overvoltage typical day typical period in a future period; And repeating the random sampling flow until the preset sampling times are met, and stopping to obtain a plurality of photovoltaic access scenes in the future period and the photovoltaic overvoltage condition of each node in the corresponding photovoltaic overvoltage typical day typical period.
4. The method for modifying a dedicated line for a photovoltaic overvoltage platform according to claim 3, wherein the planning a dedicated line installation scheme for each distributed photovoltaic access scenario based on photovoltaic overvoltage conditions in a typical day period of photovoltaic overvoltage comprises: screening out-of-limit voltage nodes based on photovoltaic overvoltage conditions of all nodes in a photovoltaic overvoltage typical day typical period and a preset upper limit of the voltage of the platform area; Selecting a node with the most serious current voltage out-of-limit as a target voltage out-of-limit node, erecting a photovoltaic special line to an upstream adjacent node of the target voltage out-of-limit node, estimating the voltage of the target voltage out-of-limit node and a downstream node after the photovoltaic special line is erected, and transferring distributed photovoltaic active power at the target voltage out-of-limit node to the upstream adjacent node; Judging whether a voltage out-of-limit node still exists, if so, repeatedly selecting the node with the most serious current voltage out-of-limit as a new target voltage out-of-limit node, erecting a photovoltaic special line to an upstream adjacent node of the new target voltage out-of-limit node until the voltage out-of-limit node does not exist, stopping, executing the next step, and otherwise, directly executing the next step; And calculating the voltage distribution of the whole transformer area, and generating a planning photovoltaic special line erection scheme of the current distributed photovoltaic access scene based on the voltage distribution of the whole transformer area.
5. The method for modifying a photovoltaic overvoltage platform area private line according to claim 4, wherein calculating the voltage distribution of the whole platform area and generating a planned photovoltaic private line erection scheme of a current distributed photovoltaic access scene based on the voltage distribution of the whole platform area comprises: When no voltage threshold crossing node exists, calculating the voltage distribution of the whole area by using a forward-backward substitution method, and updating the voltage of each node of the area based on the voltage distribution of the whole area; And judging whether a voltage threshold crossing node still exists or not based on the updated voltage of each node of the transformer area, if so, repeatedly erecting a photovoltaic dedicated line to an upstream adjacent node of the node with the most serious current voltage threshold crossing until the voltage threshold crossing node does not exist, otherwise, generating a planned photovoltaic dedicated line erection scheme of the current distributed photovoltaic access scene.
6. The method for modifying a photovoltaic overvoltage area private line according to claim 4, wherein the expression for estimating the voltage of the target voltage out-of-limit node and the voltage of the downstream node after the photovoltaic private line is erected is: Wherein k represents a node with the most serious current voltage out-of-limit, k' represents an upstream adjacent node of the node k, i represents a node with the most serious current voltage out-of-limit and any node downstream thereof, R kk' represents line resistance of the node with the most serious current voltage out-of-limit to the upstream adjacent node, V i represents a node with the most serious current voltage out-of-limit and the voltage of the downstream node thereof after the photovoltaic special line is erected, P pv,k represents distributed photovoltaic active power of the node k, and V k represents the current voltage of the node k.
7. The method for dedicated line reformation of a photovoltaic overvoltage area according to claim 6, wherein the expression for transferring the distributed photovoltaic active power at the target voltage out-of-limit node to the upstream neighboring node is: P pv,k' ＝P pv,k' +P pv,k ,P pv,k =0; Where P pv,k' represents the distributed photovoltaic active power of node k' and P pv,k represents the distributed photovoltaic active power of node k.
8. The utility model provides a photovoltaic overvoltage platform district private line transformation system which characterized in that, this system includes: The power consumption parameter acquisition module is used for acquiring power consumption load parameters and distributed photovoltaic parameters of each node in a typical solar typical period of photovoltaic overvoltage; The photovoltaic access scene construction module is used for constructing a distributed photovoltaic access scene of a future period by utilizing a random sampling method based on the power load parameters of each node and the distributed photovoltaic parameters, and calculating photovoltaic overvoltage conditions of a photovoltaic overvoltage typical day typical period corresponding to the distributed photovoltaic access scene; the photovoltaic special line erection scheme planning module is used for planning a photovoltaic special line erection scheme for each distributed photovoltaic access scene based on photovoltaic overvoltage conditions of typical solar typical time periods of photovoltaic overvoltage; and the photovoltaic special line transformation scheme integration module is used for integrating all the photovoltaic special line erection schemes in the distributed photovoltaic access scene as a photovoltaic special line transformation scheme for distributed photovoltaic access in the future period.
9. The photovoltaic overvoltage district private line modification system according to claim 8, wherein the node electrical load parameters and the distributed photovoltaic parameters include active power, reactive power of the node electrical load and active power of the node distributed photovoltaic.
10. The system for modifying a dedicated line of a photovoltaic overvoltage platform according to claim 8, wherein the constructing a distributed photovoltaic access scene of a future period by using a random sampling method based on the electrical load parameters and the distributed photovoltaic parameters of each node, and calculating photovoltaic overvoltage conditions of a photovoltaic overvoltage typical day typical period corresponding to the distributed photovoltaic access scene comprises: Acquiring photovoltaic installation-reporting willingness data of power users at each node in a platform area, and evaluating the probability of adding distributed photovoltaics to each node in a future period based on the photovoltaic installation-reporting willingness data of the power users; Under the condition that the injection power increment generated in the typical period of the photovoltaic overvoltage is in normal distribution, randomly sampling the target node to determine whether the target node in the future period is additionally provided with distributed photovoltaic; Screening nodes added with distributed photovoltaic, and determining newly-increased injection power of the nodes added with the distributed photovoltaic in a typical period of photovoltaic overvoltage typical days according to normal distribution sampling; adding the newly added injection power with the active power of each node at present, and calculating the active power and reactive power of each node in a photovoltaic overvoltage typical day typical period in a future period; And repeating the random sampling flow until the preset sampling times are met, and stopping to obtain a plurality of photovoltaic access scenes in the future period and the photovoltaic overvoltage condition of each node in the corresponding photovoltaic overvoltage typical day typical period.
11. The photovoltaic overvoltage area private line modification system according to claim 10, wherein the planning a photovoltaic private line erection scheme for each distributed photovoltaic access scenario based on photovoltaic overvoltage conditions for a photovoltaic overvoltage typical day typical period comprises: screening out-of-limit voltage nodes based on photovoltaic overvoltage conditions of all nodes in a photovoltaic overvoltage typical day typical period and a preset upper limit of the voltage of the platform area; Selecting a node with the most serious current voltage out-of-limit as a target voltage out-of-limit node, erecting a photovoltaic special line to an upstream adjacent node of the target voltage out-of-limit node, estimating the voltage of the target voltage out-of-limit node and a downstream node after the photovoltaic special line is erected, and transferring distributed photovoltaic active power at the target voltage out-of-limit node to the upstream adjacent node; Judging whether a voltage out-of-limit node still exists, if so, repeatedly selecting the node with the most serious current voltage out-of-limit as a new target voltage out-of-limit node, erecting a photovoltaic special line to an upstream adjacent node of the new target voltage out-of-limit node until the voltage out-of-limit node does not exist, stopping, executing the next step, and otherwise, directly executing the next step; And calculating the voltage distribution of the whole transformer area, and generating a planning photovoltaic special line erection scheme of the current distributed photovoltaic access scene based on the voltage distribution of the whole transformer area.
12. The photovoltaic overvoltage area private line modification system according to claim 11, wherein the calculating the full area voltage distribution and generating the planned photovoltaic private line erection scheme of the current distributed photovoltaic access scenario based on the full area voltage distribution comprises: When no voltage threshold crossing node exists, calculating the voltage distribution of the whole area by using a forward-backward substitution method, and updating the voltage of each node of the area based on the voltage distribution of the whole area; And judging whether a voltage threshold crossing node still exists or not based on the updated voltage of each node of the transformer area, if so, repeatedly erecting a photovoltaic dedicated line to an upstream adjacent node of the node with the most serious current voltage threshold crossing until the voltage threshold crossing node does not exist, otherwise, generating a planned photovoltaic dedicated line erection scheme of the current distributed photovoltaic access scene.
13. The photovoltaic overvoltage area private line modification system according to claim 11, wherein the expression for estimating the voltage of the target voltage out-of-limit node and the voltage of the downstream node after the erection of the photovoltaic private line is: Wherein k represents a node with the most serious current voltage out-of-limit, k' represents an upstream adjacent node of the node k, i represents a node with the most serious current voltage out-of-limit and any node downstream thereof, R kk' represents line resistance of the node with the most serious current voltage out-of-limit to the upstream adjacent node, V i represents a node with the most serious current voltage out-of-limit and the voltage of the downstream node thereof after the photovoltaic special line is erected, P pv,k represents distributed photovoltaic active power of the node k, and V k represents the current voltage of the node k.
14. The photovoltaic overvoltage district private line modification system according to claim 13, wherein the expression for transferring the distributed photovoltaic active power at the target voltage out-of-limit node to the upstream neighboring node is: P pv,k' ＝P pv,k' +P pv,k ,P pv,k =0; Where P pv,k' represents the distributed photovoltaic active power of node k' and P pv,k represents the distributed photovoltaic active power of node k.
15. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any of claims 1 to 7 when the computer program is executed.
16. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 7.

Description

Photovoltaic overvoltage platform area private line transformation method, system, equipment and medium Technical Field The invention relates to the technical field of power systems, in particular to a method, a system, equipment and a medium for modifying a special line of a photovoltaic overvoltage transformer area. Background The access scale of the Distributed Photovoltaic (DPV) in the low-voltage distribution network is continuously enlarged, and the DPV becomes an important support for energy transformation. However, the original design of the low-voltage power distribution network is not suitable for high-proportion photovoltaic access requirements, the line impedance is large, the topological structure is fixed, and when a large amount of photovoltaic output is reversely transmitted through the original line, the problems of voltage lifting, out-of-limit and the like are easily caused, so that the power supply quality and the safe and stable operation of the power distribution network are seriously affected. The existing voltage treatment scheme has obvious limitations that the reactive power compensation device can only relieve local voltage fluctuation, has limited global out-of-limit effect caused by reverse power flow, has high cost of energy storage equipment, is difficult to popularize on a large scale, has long construction period of line capacity-increasing transformation and large land-feature difficulty, and does not optimize the specificity of photovoltaic access. In order to meet the large-scale photovoltaic access requirement, industry provides a transformation thought for synchronously erecting a photovoltaic special line, but a scientific special line erection section planning method is lacking currently, namely, blind full-section erection causes the rapid increase of transformation cost and serious resource waste, and the problem of voltage out-of-limit can not be thoroughly solved only by selecting a local line section according to experience, so that the treatment effect is unstable. Therefore, a planning method capable of accurately identifying key line segments of a photovoltaic special line to be synchronously erected in a low-voltage line and reducing transformation cost to the maximum extent on the premise of meeting voltage treatment requirements is needed, and technical support is provided for photovoltaic access transformation of a low-voltage distribution network. Therefore, how to provide a method, a system, a device and a medium for modifying a photovoltaic overvoltage platform private line is a problem to be solved at present. Disclosure of Invention The embodiment of the invention provides a special line reconstruction method for a photovoltaic overvoltage platform region, which aims to solve the technical problems in the prior art. According to a first aspect of an embodiment of the invention, a method for modifying a dedicated line of a photovoltaic overvoltage transformer area is provided. In one embodiment, the photovoltaic overvoltage platform area private line reconstruction method comprises the following steps: acquiring power load parameters and distributed photovoltaic parameters of each node in a photovoltaic overvoltage typical day typical period; based on the power load parameters and the distributed photovoltaic parameters of each node, constructing a distributed photovoltaic access scene of a future period by utilizing a random sampling method, and calculating photovoltaic overvoltage conditions of a photovoltaic overvoltage typical day typical period corresponding to the distributed photovoltaic access scene; planning a photovoltaic special line erection scheme for each distributed photovoltaic access scene based on photovoltaic overvoltage conditions of photovoltaic overvoltage in typical day typical period; and taking the union of the photovoltaic special line erection schemes under all the distributed photovoltaic access scenes as a photovoltaic special line reconstruction scheme for the distributed photovoltaic access in the future period. In one embodiment, the electrical load parameters and the distributed photovoltaic parameters of each node include the active power, the reactive power of the electrical load of each node and the active power of the distributed photovoltaic of each node. In one embodiment, the constructing a distributed photovoltaic access scene of a future period by using a random sampling method based on the electrical load parameters and the distributed photovoltaic parameters of each node, and calculating photovoltaic overvoltage conditions of a photovoltaic overvoltage typical day typical period corresponding to the distributed photovoltaic access scene includes: Acquiring photovoltaic installation-reporting willingness data of power users at each node in a platform area, and evaluating the probability of adding distributed photovoltaics to each node in a future period based on the photovoltaic installation-reporting willingn