CN-121996874-A - Method and device for selecting access node of camera

CN121996874ACN 121996874 ACN121996874 ACN 121996874ACN-121996874-A

Abstract

The application discloses a method and a device for selecting an access node of a camera, belonging to the field of control of an alternating current system; when the multi-feed interaction factor among the converter buses is not larger than the ratio of the impedance between the converter buses and the access node of the camera, the total objective function value of the address scheme of the camera is calculated according to the objective impedance data, the weight parameters of the converter buses, the rated power, the multi-feed short circuit ratio and the multi-feed interaction factor, and the node accessed by the camera in the address scheme of the camera with the highest total objective function value is used as the final access node of the camera. By implementing the application, the problems of overlong calculation period and high simulation cost caused by the fact that the prior art relies on electromagnetic transient simulation to solve the site selection of a camera can be solved.

Inventors

JIN CHU
YANG YAN
AI XIAOMENG
MAO ZHIPENG
FANG JIAKUN
WEN JINYU
LUO SHUXIN
DUAN XIAOYI
WU WENLI
WANG YUCHONG
He Tingke
LI ZUOHONG
CHEN DANQING
CUI SHICHANG

Assignees

广东电网有限责任公司

Dates

Publication Date: 20260508
Application Date: 20260129

Claims (10)

1. A method of selecting a camera access node, comprising: Acquiring initial impedance data of a target alternating current system, rated power of each converter bus in the target alternating current system and a plurality of camera site selection schemes, wherein each camera site selection scheme comprises weight parameters of each converter bus; For each camera tuning and addressing scheme, adjusting the initial impedance data according to the node impedance of a camera tuning access node in the current camera tuning and addressing scheme to obtain target impedance data; According to the target impedance data and rated power of each converter bus, calculating to obtain multi-feed short-circuit ratio and multi-feed interaction factor of each converter bus; According to the target impedance data, calculating to obtain the ratio of the impedance between each converter bus and the access node of the phase-change regulator; Judging whether the multi-feed interaction factors among the converter buses are not larger than the ratio, if so, calculating to obtain the total objective function value of the current site selection scheme of the camera according to the objective impedance data, the weight parameters of the converter buses, the rated power, the multi-feed short-circuit ratio and the multi-feed interaction factors, and if not, discarding the current site selection scheme of the camera; And screening the camera tuning address scheme with the highest total objective function value as a target camera tuning address scheme, and taking a node accessed by a camera tuning in the target camera tuning address scheme as a final access node of the camera tuning.
2. The method of selecting a camera access node of claim 1, wherein the node impedance of the camera access node comprises a self-impedance of the camera access node and a transimpedance of the camera access node with a remaining node in the target ac system; the step of adjusting the initial impedance data according to the node impedance of the camera access node in the current camera address selection scheme to obtain target impedance data comprises the following steps: According to the self-impedance of a camera access node and the mutual impedance of the camera access node and the rest nodes in a target alternating current system in the current camera address selection scheme, the initial impedance data is adjusted to obtain target impedance data, wherein the initial impedance between any two nodes in the initial impedance data is adjusted through the following formula: ; in the formula, Representing nodes And node An initial impedance therebetween; Access node for camera adjustment Is a self-impedance of (2); Representing a camera access node And node Is a trans-impedance of (c); Representing a camera access node And node Is a trans-impedance of (c).
3. The method for selecting a switching node for a camera according to claim 2, wherein calculating a multi-feed short-circuit ratio and a multi-feed interaction factor of each converter bus according to the target impedance data and the rated power of each converter bus comprises: according to the target impedance data, calculating to obtain multi-feed interaction factors among conversion buses in the target alternating current system; And calculating the multi-feed-in short-circuit ratio of each converter bus in the target alternating current system according to the rated power of each converter bus and the target impedance data.
4. The method for selecting a camera access node according to claim 3, wherein said calculating a multi-feed interaction factor between converter buses in said target ac system based on said target impedance data comprises: The multi-feed interaction factor is calculated by the following formula: ; in the formula, Indicating a converter bus And converter bus A multi-feed interaction factor therebetween; Indicating a converter bus And converter bus Is a trans-impedance of (c); representing the equivalent impedance of the branch where the access node of the phase-change modulator is located; Indicating a converter bus Access node for phase-change memory Is a trans-impedance of (c); Indicating a converter bus Access node for phase-change memory Is a trans-impedance of (c); Indicating a converter bus Is a self-impedance of the (c).
5. The method of claim 4, wherein said calculating a multi-feed short ratio for each converter bus in said target ac system based on said target impedance data comprises: the multi-feed short-circuit ratio is calculated by the following formula: ; in the formula, Representing a multi-feed short ratio; Representing a camera access node And converter bus Is a trans-impedance of (c); Representing the total number of the converter buses; Representing a camera access node And converter bus Is a trans-impedance of (c); Indicating a converter bus Is set to the rated power of (3); Indicating a converter bus Is set to the rated power of (3).
6. The method of selecting a camera access node of claim 1, wherein the total objective function value comprises a first objective function value and a second objective function value; The calculating to obtain the total objective function value of the current site selection scheme of the tuner according to the objective impedance data, the weight parameters of each converter bus, the rated power, the multi-feed short-circuit ratio and the multi-feed interaction factor comprises the following steps: calculating to obtain a first objective function value according to the objective impedance data, the weight parameters of each converter bus and the multi-feed interaction factor; Calculating a second objective function value according to the objective impedance data, the weight parameters of each converter bus, the rated power and the multi-feed short-circuit ratio; And calculating the total objective function value of the current camera tuning address scheme according to the first objective function value and the second objective function value.
7. The method of claim 6, wherein said calculating a first objective function value based on said target impedance data, weight parameters of each converter bus, and multi-feed interaction factors comprises: The first objective function value is calculated by the following formula: ; in the formula, Representing a first objective function value; Indicating a converter bus Weight parameters of (c).
8. The method of claim 7, wherein calculating a second objective function value based on the objective impedance data, the weight parameter of each converter bus, the rated power, and the multi-feed short-circuit ratio comprises: The second objective function value is calculated by the following formula: ; in the formula, Representing a camera access node And converter bus Is a trans-impedance of (c).
9. The method of selecting a camera access node of claim 8, wherein the weight parameters for each of the converter buses are determined by: according to node impedance of the three-phase symmetrical reactor access node in the target impedance data, calculating to obtain voltage coupling factors of all the converter buses; counting the number of the converter buses with the voltage coupling factors exceeding the corresponding threshold voltage coupling factors as a first number; and determining weight parameters of each converter bus according to the total number of the converter buses in the target alternating current system and the first number.
10. A selected apparatus for a camera access node, comprising: The system comprises a data acquisition module, a target alternating current system, a power supply module and a power supply module, wherein the data acquisition module is used for acquiring initial impedance data of the target alternating current system, rated power of each converter bus in the target alternating current system and a plurality of camera addressing schemes, and each camera addressing scheme comprises weight parameters of each converter bus; The data adjustment module is used for adjusting the initial impedance data according to the node impedance of the camera access node in the current camera address selection scheme to obtain target impedance data; the first calculation module is used for calculating and obtaining the multi-feed short-circuit ratio and the multi-feed interaction factor of each converter bus according to the target impedance data and the rated power of each converter bus; the second calculation module is used for calculating and obtaining the ratio of the impedance between each converter bus and the access node of the phase-change regulator according to the target impedance data; The scheme screening module is used for judging whether the multi-feed interaction factors among the converter buses are not larger than the ratio, if yes, calculating to obtain the total objective function value of the current camera tuning address scheme according to the objective impedance data, the weight parameters of the converter buses, the rated power, the multi-feed short circuit ratio and the multi-feed interaction factors, and if not, discarding the current camera tuning address scheme; The access node determining module is used for screening the camera positioning scheme with the highest overall objective function value as a target camera positioning scheme, and taking the node accessed by the camera in the target camera positioning scheme as the final access node of the camera.

Description

Method and device for selecting access node of camera Technical Field The present invention relates to the field of ac system control, and in particular, to a method and apparatus for selecting an access node of a camera. Background Along with the continuous expansion of the large-capacity and long-distance direct current transmission engineering scale, a complex multi-direct current feed-in receiving-end power grid structure is formed in a load center area, and the introduction of a phase regulator is an important means for improving the voltage supporting capability of a receiving-end alternating current system and reducing the risk of commutation failure. However, because the investment cost of the phase-change camera is high, the phase-change camera cannot be deployed on a large scale on each converter bus, and the scientific and reasonable determination of the phase-change camera access node becomes an important problem in power grid planning and operation. The existing site selection method of the camera mostly depends on large-scale electromagnetic transient simulation, fault disturbance is applied to all nodes of the whole network one by one, and response is analyzed to obtain sensitivity and importance indexes of each node, and the method can be applied to a small-scale system with limited number of nodes, but in a multi-feed direct current receiving end power network with a large number of converter stations, complex alternating current network racks and dense coupling relations, the calculation scale is exponentially increased, so that the calculation period is overlong, the simulation cost is high, and the requirements of engineering practice on quick optimization and real-time decision are difficult to meet. Disclosure of Invention The invention provides a method and a device for selecting an access node of a camera, which can solve the problems of overlong calculation period and high simulation cost caused by the site selection of the camera due to electromagnetic transient simulation in the prior art. An embodiment of the present invention provides a method for selecting an access node of a camera, including: Acquiring initial impedance data of a target alternating current system, rated power of each converter bus in the target alternating current system and a plurality of camera site selection schemes, wherein each camera site selection scheme comprises weight parameters of each converter bus; For each camera tuning and addressing scheme, adjusting the initial impedance data according to the node impedance of a camera tuning access node in the current camera tuning and addressing scheme to obtain target impedance data; According to the target impedance data and rated power of each converter bus, calculating to obtain multi-feed short-circuit ratio and multi-feed interaction factor of each converter bus; According to the target impedance data, calculating to obtain the ratio of the impedance between each converter bus and the access node of the phase-change regulator; Judging whether the multi-feed interaction factors among the converter buses are not larger than the ratio, if so, calculating to obtain the total objective function value of the current site selection scheme of the camera according to the objective impedance data, the weight parameters of the converter buses, the rated power, the multi-feed short-circuit ratio and the multi-feed interaction factors, and if not, discarding the current site selection scheme of the camera; And screening the camera tuning address scheme with the highest total objective function value as a target camera tuning address scheme, and taking a node accessed by a camera tuning in the target camera tuning address scheme as a final access node of the camera tuning. Further, the node impedance of the camera access node comprises the self-impedance of the camera access node and the mutual impedance between the camera access node and the rest nodes in the target alternating current system; the step of adjusting the initial impedance data according to the node impedance of the camera access node in the current camera address selection scheme to obtain target impedance data comprises the following steps: According to the self-impedance of a camera access node and the mutual impedance of the camera access node and the rest nodes in a target alternating current system in the current camera address selection scheme, the initial impedance data is adjusted to obtain target impedance data, wherein the initial impedance between any two nodes in the initial impedance data is adjusted through the following formula: ; in the formula, Representing nodesAnd nodeAn initial impedance therebetween; Access node for camera adjustment Is a self-impedance of (2); Representing a camera access node And nodeIs a trans-impedance of (c); Representing a camera access node And nodeIs a trans-impedance of (c). Further, the calculating, according to the target impedance data and the rated