CN-115149533-B - Load transfer control method and device for AC/DC hybrid power distribution network and electronic equipment

CN115149533BCN 115149533 BCN115149533 BCN 115149533BCN-115149533-B

Abstract

The invention discloses a load transfer control method and device for an alternating current-direct current hybrid power distribution network and electronic equipment. The method comprises the steps of obtaining current running states of a plurality of converter stations in an alternating-current and direct-current hybrid power distribution network, determining a load transfer objective function and a load transfer constraint condition corresponding to the alternating-current and direct-current hybrid power distribution network according to the current running states, carrying out load flow calculation on the alternating-current and direct-current hybrid power distribution network by adopting a pre-built load transfer model and a system reconstruction model based on the load transfer constraint condition to obtain a load flow calculation result, calculating an objective function value corresponding to the load transfer objective function based on the load flow calculation result, and determining a load transfer control result of the alternating-current and direct-current hybrid power distribution network according to the objective function value. The invention solves the technical problems of low control efficiency and inaccurate control existing in the load transfer control method in the related art.

Inventors

WANG HAIYUN
YU XIJUAN
SHI ENJIE
CHEN YANXIA
ZHANG ZAICHI
CHEN QIAN
YANG LIPING
ZHANG YUXUAN
WANG WEI
YAO YIDI
XU PENG
WANG FANGYU

Assignees

国网北京市电力公司
国家电网有限公司

Dates

Publication Date: 20260508
Application Date: 20220525

Claims (9)

1. The load transfer control method of the alternating current-direct current hybrid power distribution network is characterized by comprising the following steps of: The method comprises the steps of obtaining current running states of a plurality of converter stations in an AC/DC hybrid power distribution network, wherein the current running states comprise current running parameters corresponding to the plurality of converter stations respectively and current switching states of contact switches included in the AC/DC hybrid power distribution network; Determining a load transfer objective function and a load transfer constraint condition corresponding to the AC/DC hybrid power distribution network according to the current running state; Based on the load transfer constraint condition, carrying out load flow calculation on the alternating current-direct current hybrid power distribution network by adopting a pre-constructed load transfer and system reconstruction model to obtain a load flow calculation result; Calculating an objective function value corresponding to the load transfer objective function based on the load flow calculation result; determining and obtaining a load transfer control result of the AC/DC hybrid power distribution network according to the objective function value; The load transfer constraint condition-based load transfer method comprises the steps of carrying out load flow calculation on an alternating current-direct current hybrid power distribution network by adopting a pre-built load transfer and system reconstruction model to obtain a load flow calculation result, carrying out outer layer optimization calculation on the load transfer and system reconstruction model by adopting a grid self-adaptive direct search algorithm to obtain an outer layer optimization calculation result based on the load transfer constraint condition, carrying out inner layer load flow calculation on the load transfer and system reconstruction model by adopting an alternate iteration algorithm to obtain an inner layer optimization calculation result based on the load transfer constraint condition, and determining to obtain the load flow calculation result according to the outer layer optimization calculation result and the inner layer optimization calculation result.
2. The method according to claim 1, wherein determining the load transfer control result of the ac/dc hybrid power distribution network according to the objective function value includes: acquiring a comprehensive operation constraint index value in the load transfer constraint condition; Determining whether the plurality of converter stations participate in load transfer optimization according to the comprehensive operation constraint index value; If the plurality of converter stations participate in the load transfer optimization, determining that the load transfer control result comprises target operation parameters respectively corresponding to the plurality of converter stations and target switch states of the contact switches in the AC/DC hybrid power distribution network; and if the plurality of converter stations do not participate in the load transfer optimization, determining that the load transfer control result is the target switch state of the included tie switch.
3. The method of claim 1, wherein when a failure of any one of the converter stations in the ac-dc hybrid distribution network is detected, the method further comprises: Acquiring current operation control modes of the plurality of converter stations; determining and obtaining an effective station set according to the current operation control mode; Calculating priority values respectively corresponding to all converter stations in the effective station set; And updating the current operation parameters respectively corresponding to the plurality of converter stations according to the priority value.
4. A method according to claim 3, characterized in that the method further comprises: determining and obtaining an updated load transfer objective function and an updated load transfer constraint condition according to the updated current operation parameters; Carrying out power flow calculation on the alternating current-direct current hybrid power distribution network based on the updated load transfer objective function and the updated load transfer constraint condition to obtain an updated power flow calculation result; and determining and obtaining optimized operation parameters corresponding to the plurality of converter stations respectively according to the updated power flow calculation result.
5. A method according to claim 3, wherein upon determining that the current operational control mode is a master-slave control mode, the method further comprises: And determining at least one new main station from the plurality of converter stations according to the priority value.
6. The method according to any one of claims 1 to 5, wherein, The alternating current-direct current hybrid power distribution network adopts a real-time Ethernet EtherCAT to carry out real-time communication.
7. The utility model provides a load transfer controlling means of alternating current-direct current hybrid distribution network which characterized in that includes: The acquisition module is used for acquiring the current running states of a plurality of converter stations in the AC/DC hybrid power distribution network, wherein the current running states comprise current running parameters corresponding to the plurality of converter stations and current switching states of tie switches included in the AC/DC hybrid power distribution network; the first determining module is used for determining a load transfer objective function and a load transfer constraint condition corresponding to the AC/DC hybrid power distribution network according to the current running state; the first calculation module is used for carrying out load flow calculation on the alternating current-direct current hybrid power distribution network by adopting a pre-constructed load transfer and system reconstruction model based on the load transfer constraint condition to obtain a load flow calculation result; The second calculation module is used for calculating and obtaining an objective function value corresponding to the load transfer objective function based on the load flow calculation result; The second determining module is used for determining and obtaining a load transfer control result of the alternating current-direct current hybrid power distribution network according to the objective function value; The first calculation module is further used for carrying out outer layer optimization calculation on the load transfer and system reconstruction model by adopting a grid self-adaptive direct search algorithm based on the load transfer constraint condition to obtain an outer layer optimization calculation result, carrying out inner layer power flow calculation on the load transfer and system reconstruction model by adopting an alternate iteration algorithm based on the load transfer constraint condition to obtain an inner layer optimization calculation result, and determining to obtain the power flow calculation result according to the outer layer optimization calculation result and the inner layer optimization calculation result.
8. A non-volatile storage medium, characterized in that the storage medium comprises a stored program, wherein the program, when run, controls a device in which the storage medium is located to execute the load transfer control method of the ac/dc hybrid distribution network according to any one of claims 1 to 6.
9. An electronic device comprising one or more processors and a memory for storing one or more programs, wherein the one or more programs, when executed by the one or more processors, cause the one or more processors to implement the method of load transfer control of an ac-dc hybrid distribution network of any of claims 1 to 6.

Description

Load transfer control method and device for AC/DC hybrid power distribution network and electronic equipment Technical Field The invention relates to the technical field of power grid load transfer control, in particular to a load transfer control method, a device and electronic equipment of an alternating current-direct current hybrid power distribution network. Background At present, for load transfer control of an alternating current/direct current distribution network, research is mainly focused on load transfer and reconstruction of an alternating current power grid, a sectionalizing switch and a contact switch are generally adopted to sectionalize and moderately contact a feeder line, a ring network structure and open-loop operation are realized, the sectionalizing level and the contact number are determined according to the number and the installation position of distribution transformers, the nature of power supply users, the length of overhead lines, the surrounding environment and other factors, the positions of the sectionalized positions of the lines are correspondingly adjusted according to the change of the distribution network and the load transfer condition, but the operation level of the distribution network is improved only by changing the opening and closing combination of the switch, the load transfer control efficiency is lower, and the control accuracy and the real-time performance are poor. In view of the above problems, no effective solution has been proposed at present. Disclosure of Invention The embodiment of the invention provides a load transfer control method, a device and electronic equipment of an alternating current/direct current hybrid power distribution network, which at least solve the technical problems of low control efficiency and inaccurate control existing in the load transfer control method in the related art. According to one aspect of the embodiment of the invention, a load transfer control method of an alternating-current/direct-current hybrid power distribution network is provided, and the load transfer control method comprises the steps of obtaining current operation states of a plurality of converter stations in the alternating-current/direct-current hybrid power distribution network, wherein the current operation states comprise current operation parameters corresponding to the plurality of converter stations and current switch states of tie switches included in the alternating-current/direct-current hybrid power distribution network, determining a load transfer objective function and a load transfer constraint condition corresponding to the alternating-current/direct-current hybrid power distribution network according to the current operation states, carrying out load flow calculation on the alternating-current/direct-current hybrid power distribution network by adopting a pre-built load transfer and system reconstruction model based on the load transfer constraint condition to obtain a load flow calculation result, calculating an objective function value corresponding to the load transfer objective function based on the load flow calculation result, and determining a load transfer control result of the alternating-current/direct-current hybrid power distribution network according to the objective function. The method comprises the steps of carrying out load flow calculation on an alternating current-direct current hybrid power distribution network by adopting a pre-constructed load transfer and system reconstruction model based on the load transfer constraint condition to obtain a load flow calculation result, carrying out outer layer optimization calculation on the load transfer and system reconstruction model by adopting a grid self-adaptive direct search algorithm based on the load transfer constraint condition to obtain an outer layer optimization calculation result, carrying out inner layer load flow calculation on the load transfer and system reconstruction model by adopting an alternate iteration algorithm based on the load transfer constraint condition to obtain an inner layer optimization calculation result, and determining to obtain the load flow calculation result according to the outer layer optimization calculation result and the inner layer optimization calculation result. Optionally, the determining the load transfer control result of the ac/dc hybrid power distribution network according to the objective function value includes obtaining a comprehensive operation constraint index value in the load transfer constraint condition, determining whether the plurality of converter stations participate in load transfer optimization according to the comprehensive operation constraint index value, determining that the load transfer control result includes a target operation parameter corresponding to the plurality of converter stations and a target switching state of the contact switch included in the ac/dc hybrid power distribution network if the plu