A power distribution network dynamic load balancing method, system and apparatus

Abstract

The application provides a power distribution network dynamic load balancing method, system and equipment, and the method comprises the following steps: starting line load balancing when monitoring that the load of the power distribution network is unbalanced, wherein the process of the line load balancing comprises the following steps: firstly, calculating the final target load reduction of a task line; then, performing line topology analysis to determine all tie switches of the line; determining the opposite side load by using the tie switches; judging whether the opposite side line is overloaded; if the opposite side line is not overloaded, judging whether the target load reduction is less than the allowed transfer-in amount, and determining a tentative switch according to the judgment result; and calculating the load rate of the two sides after the power transfer by using the tentative switch. Based on the method, a power distribution network dynamic load balancing system and equipment are also provided. The application realizes the monitoring and early warning of overloaded equipment, realizes load balancing by changing the network topology, provides technical support for dispatching decisions, and also plays an important role in reducing network loss and improving voltage quality.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of load transfer of power distribution network, and particularly relates to a dynamic load balancing method and system of power distribution network. BACKGROUND

[0002] With the continuous development of social economy, the power load of power distribution network is growing, and the demand of customers for power supply reliability is also increasing. The transformer and line are facing increasing pressure of heavy overload due to power grid failure and maintenance work. Balancing the load of different main transformers and different distribution lines, reducing the operation risk of main transformers and lines, has become an important content of safe operation of power distribution network.

[0003] To adapt to the new situation and new needs and ensure the safe and stable operation of the power distribution network, the power distribution network gradually moves towards digitization and intelligentization. At present, the scale of power distribution network equipment is increasingly large, and the connection and distribution of equipment are increasingly complex. The load balancing of power distribution network still mainly relies on manual analysis and decision-making, which has problems such as huge workload, low efficiency, long time consumption, and high requirements for the ability of dispatchers. Therefore, how to intelligently and reliably realize the load balancing of power distribution network is particularly important. SUMMARY

[0004] In order to solve the above technical problems, the present application provides a dynamic load balancing method and system of power distribution network. It provides intelligent support for dispatching decision-making, and also plays an important role in improving the safe operation level of power grid, reducing network loss and improving voltage quality.

[0005] To achieve the above purpose, the present application adopts the following technical scheme:

[0006] A dynamic load balancing method of power distribution network, comprising the following steps:

[0007] When the load imbalance of the power distribution network is monitored, the line load balancing is started, wherein the process of line load balancing includes: firstly calculating the final target load reduction of the task line, then performing line topology analysis to determine all the tie switches of the line, using the tie switches to determine the opposite side load, and judging whether the opposite side line is overloaded; if the opposite side line is not overloaded, judging whether the target load reduction is less than the allowed transfer-in amount, and determining the proposed split switch according to the result of the judgment, and using the proposed split switch to calculate the load rate of the two sides after the load transfer.

[0008] Further, the method further comprises: displaying the result of the line load balancing, and the result of the line load balancing specifically includes: task generation time, task description, load transfer reason, load section calculation time, number of transferred-out successful feeders and non-transferred-out successful feeders, task state and total load transfer data.

[0009] Further, the load imbalance of the power distribution network specifically includes: the equipment overload lasts for a first preset time, the equipment overload lasts for a second preset time, or the load imbalance rate is greater than a preset threshold.

[0010] Further, the process of calculating the final target load shedding amount of the line includes: calculating a first target load shedding amount according to a threshold and a second target load shedding amount according to an average load rate, judging the size of the first target load shedding amount and the second target load shedding amount, and taking the larger value as the final target load shedding amount.

[0011] Further, the method further includes calculating a load imbalance rate, specifically:

[0012] The feeder load rate L = current value / current upper limit = I / I max ;

[0013]

[0014] Further, before determining the line load balancing, it is determined whether the line operation mode at the time is a transfer supply state, whether the diagram mode is correct, whether the tie switch is an automatic switch, and whether the line operation mode appears a loop operation condition.

[0015] Further, the process of then performing line topology analysis to determine all tie switches of the line, determining the opposite side load by using the tie switch, and judging whether the opposite side line is overloaded includes:

[0016] The line topology analysis is performed to determine all tie switches of the current line, if the number of tie switches is less than 1, a record that the current line cannot perform load balancing is generated, if the number of tie switches is greater than or equal to 1, each tie switch is analyzed in sequence to determine the opposite side load, and it is judged whether the opposite side line is overloaded, if the opposite side line is overloaded, the next transferable tie switch is analyzed, and a record that load balancing cannot be performed is generated.

[0017] Further, the process of judging whether the target load shedding amount is less than the allowed transfer-in amount, and determining the tentative distribution switch according to the judgment result includes: if the target load shedding amount is less than the target load shedding amount, searching from the tie switch to the main network load, searching for a switch greater than the target transfer supply amount and less than the opposite side allowed transfer-in amount as the tentative distribution switch, if no search is found, searching from the main network load to the tie switch, and searching for a switch less than the opposite side allowed transfer-in amount as the tentative distribution switch.

[0018] The application further provides a power distribution network dynamic load balancing system, which comprises a balancing module.

[0019] The equalization module is used to start line load equalization when monitoring that the power distribution network load is unbalanced, wherein the process of line load equalization comprises the following steps: firstly, calculating the final target load reduction of the task line, then performing line topology analysis to determine all the tie switches of the line, determining the opposite side load by using the tie switches, and judging whether the opposite side line is overloaded; if the opposite side line is not overloaded, judging whether the target load reduction is less than the allowed transfer-in amount, and determining the tentative distribution switch according to the judgment result, and calculating the load rate of the two sides after transfer by using the tentative distribution switch.

[0020] The application further provides a power distribution network dynamic load equalization device, comprising:

[0021] a memory for storing a computer program;

[0022] a processor for executing the computer program to realize the method steps.

[0023] The effects provided in the summary are only the effects of the embodiments, not all the effects of the application, and one of the above technical solutions has the following advantages or beneficial effects:

[0024] The application provides a power distribution network dynamic load equalization method, system and device, the method comprising the following steps: starting line load equalization when monitoring that the power distribution network load is unbalanced, wherein the process of line load equalization comprises the following steps: firstly, calculating the final target load reduction of the task line, then performing line topology analysis to determine all the tie switches of the line, determining the opposite side load by using the tie switches, and judging whether the opposite side line is overloaded; if the opposite side line is not overloaded, judging whether the target load reduction is less than the allowed transfer-in amount, and determining the tentative distribution switch according to the judgment result, and calculating the load rate of the two sides after transfer by using the tentative distribution switch. Based on the power distribution network dynamic load equalization method, the application further provides a power distribution network dynamic load equalization system and device. The application aims at the situation that the main distribution network device is overloaded due to the peak period of power grid load, the maintenance of the main distribution network, the fault of the power grid, the change of the operation mode, etc., fully utilizes the network topology and measurement data of the main distribution network, realizes the monitoring and early warning of the overloaded device, generates a load equalization scheme by comprehensively considering the conditions such as the connection topology relationship of the line, the controllability of the tie switch, the load rate of the opposite side line / main transformer, etc., and automatically or manually confirms the execution of the change of the network topology to realize load equalization.

[0025] The application solves the problems of long time consumption and high operation risk of traditional dispatching operation, realizes the monitoring and early warning of the overloaded device, realizes load equalization by changing the network topology, provides technical support for dispatching decision, and plays an important role in reducing network loss and improving voltage quality. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 A power distribution network dynamic load equalization method flowchart is provided for the embodiment 1 of the application.

[0027] Figure 2 A flow chart for starting a power distribution network dynamic load balancing method proposed in embodiment 1 of the present application;

[0028] Figure 3 A detailed flow chart for load balancing proposed in embodiment 1 of the present application;

[0029] Figure 4 A power distribution network dynamic load balancing system schematic diagram proposed in embodiment 2 of the present application;

[0030] Figure 5 A power distribution network dynamic load balancing equipment schematic diagram proposed in embodiment 3 of the present application. DETAILED DESCRIPTION

[0031] To clearly illustrate the technical features of the present application, the present application will be described in detail below with specific embodiments, and in conjunction with the accompanying drawings. The following disclosure provides many different embodiments or examples to implement different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. In addition, the present application can repeatedly refer to the same numbers and / or letters in different examples. Such repetition is for the purpose of simplification and clarity, and does not in itself indicate the relationship between the various embodiments and / or settings being discussed. It should be noted that the components illustrated in the drawings are not necessarily drawn to scale. The present application omits the description of well-known components and processing techniques and processes to avoid unnecessary limitation of the present application.

[0032] Embodiment 1

[0033] Embodiment 1 of the present application proposes a power distribution network dynamic load balancing method, which solves the problems of long time-consuming and high operation risk of traditional dispatching operation. Figure 1 A flow chart of a power distribution network dynamic load balancing method proposed in embodiment 1 of the present application;

[0034] In step S1, in order to make full use of the main distribution network data, the interface between the distribution network and the main network information system is opened, the main and distribution network data and the graph model are connected, the substation side full amount telemetry, remote signaling information and graph, model parameters are accessed to the power distribution automation master station for real-time monitoring, and the basis for topology analysis, loop closing phase angle difference calculation and main transformer load rate calculation is provided.

[0035] Figure 2 A flow chart for starting a power distribution network dynamic load balancing method proposed in embodiment 1 of the present application;

[0036] In step S2, when the peak period of power grid load, main and distribution network maintenance, power grid fault, and operation mode change cause the main transformer or line to be overloaded or the load imbalance rate to reach the threshold value, dynamic load balancing is performed.

[0037] When the device overload lasts for a first preset time, the device overload lasts for a second preset time, or the load imbalance rate is greater than a preset threshold, the dynamic load balancing is automatically started.

[0038] When the device overload (line load rate greater than 70%, main transformer load rate greater than 85% settable) lasts for 2 hours (settable), the overload (load rate greater than 100%) lasts for 5 minutes (settable), and the load imbalance rate is greater than a threshold value, load balancing analysis is performed.

[0039] The application can also manually start dynamic load balancing. When starting a new task, the device for load balancing needs to be selected, such as a transformer, a line switch, or a device selected on a wiring diagram to start a right-click menu. The load value to be reduced is manually input, and load balancing analysis is performed.

[0040] In step S3, the load balancing scheme is generated by comprehensively considering the line connection topology relationship, the controllability of the tie switch, the load rate of the line / main transformer on the side and the opposite side, and the like. The load transfer can be performed in a semi-automatic or automatic manner.

[0041] When performing load balancing, it is necessary to determine whether the line operation mode is in a transfer state, whether the diagram model is correct, whether the tie switch is an automatic switch, and whether the line operation mode has a loop operation condition.

[0042] The load balancing specifically includes: transfer-out device information, transfer-out feeder scheme overview, transfer-in feeder information, transfer supply situation analysis and statistics, main transformer load information, and the like.

[0043] The transfer-out device list information displays the devices for transfer-out operation, such as switch devices for operation mode adjustment;

[0044] The transfer-out feeder scheme overview displays the transfer-out feeder information and the transfer supply area, the transfer supply load, the load loss, the user loss, the transfer supply user, the transfer-in transfer supply line, whether the loop network is allowed, the execution mode, and the execution current state content;

[0045] The transfer supply situation statistics statistically display the transfer supply total load information, the transfer supply line information, and the transfer supply user information;

[0046] The main transformer information statistics display the main transformer reserve capacity and the load rate and the like;

[0047] The transfer-in feeder list displays the load rate and the reserve capacity of the transfer supply line, and the description of the transfer supply area;

[0048] The transfer supply scheme strategy describes the transfer supply line information of each transfer supply area, and can select different paths to regenerate the strategy.

[0049] The load balancing scheme combines the local line and the opposite line / main transformer load rate (based on the local line start section, opposite line / main transformer real-time load or 2-hour predicted load section calculation), whether the switch is three-remote controllable, and the load importance to set the priority of the load balancing strategy. Specifically:

[0050] First, the switch involved in the scheme is three-remote controllable;

[0051] According to the load margin of the opposite tie line from high to low, select the line with high load margin as the priority scheme; at the same time, provide all the optional schemes for manual selection and execution; if all the load margins of the opposite lines are insufficient, consider implementing segmented transfer or chain ball transfer, and identify them by color or other means, and provide the option of whether to enable.

[0052] Consider the level of users carried, and preferentially transfer the load of the line without important users, and preferentially consider transferring the load from the line without important users. If it is necessary to transfer the load of the line with important users or it is necessary to transfer the load from the line with important users, the important users should be ensured not to lose power during the transfer process. The single power transfer scheme for important users is identified.

[0053] Consider whether the transfer path of the scheme has a distributed power source, and prefer the scheme without a distributed power source in the transfer path.

[0054] The load balancing scheme prohibits the following transfer logic:

[0055] The station switch, sectionalizing switch, and tie switch involved have a signboard with a prohibited operation attribute (remote control, cold standby, fault, danger, maintenance) on it. In this case, the transfer strategy will not be included in the scheme.

[0056] The station switch, sectionalizing switch, and tie switch involved are abnormal (acquisition problem, working condition exit, suspicious, blocked, prohibited control, non-real measurement, double-bit error), and the protection signal is in the action state. In this case, the line will not appear in the transfer strategy.

[0057] When the system gives the transfer scheme, it needs to consider the existence of phase angle difference of loop closing and other set conditions of whether the tie switch allows loop closing. If there is a phase angle difference or the tie switch does not allow loop closing, it should be considered to control the section first and then control the loop to avoid tripping and power outage caused by loop closing.

[0058] In step S4, after confirmation, the load balancing is performed, and the execution process includes two modes of semi-automatic execution and full-automatic execution. The semi-automatic mode includes simulation rehearsal, execution selection, execution scheme review, execution mode, and execution exception content. The full-automatic execution mode includes execution scheme review, execution mode, and execution exception content.

[0059] Simulation rehearsal, which can rehearse the execution process in the research state, can show the device overload, load transfer changes, operation execution results, and line topology state updates after load transfer, and operation personnel can simulate the execution of load transfer in an automatic or manual intervention manner and view the simulation execution results graphically.

[0060] Execution selection refers to that when the generated load transfer scheme contains multiple lines or multiple load transfer areas, the lines for execution can be selected according to actual conditions.

[0061] Execution scheme checking includes topology safety, operation switch, and load transfer source path checking; and the generated load balancing scheme can be manually modified, and the feasibility of the manually modified scheme needs to be checked, and the checking result (if the load transfer cannot be implemented, the reason for the failure needs to be given) is given.

[0062] Topology safety checking includes: anti-misoperation check such as ground switch state, loop network check, power supply interval check, power supply point state anomaly check, and tag check.

[0063] Operation switch checking content specifically includes: switches with maintenance, operation prohibition, grounding, keep closed, fault, danger, alarm, test, and transmission; no control authority (no remote control authority, device communication anomaly, and remote control preset failure);

[0064] Load transfer source line checking specifically includes: single-phase ground fault of the load transfer source line, no use of the load transfer path; whether the bus where the load transfer source line is located has been closed loop, only one feeder is allowed to be closed loop at the same time under the same bus; abnormal current collection of distribution lines, distribution lines are set to be unable to be used as load transfer source lines; outgoing switch with maintenance, operation prohibition, grounding, keep closed, fault, danger, alarm, test, and transmission; insufficient transformer, distribution line, and switch reserve; load transfer source line has a fault signal, and the load transfer path is not used.

[0065] Execution mode is that the scheme supports single-step, sequential, and concurrent execution, specifically as follows:

[0066] Single-step execution: each operation step needs to be confirmed by the operator;

[0067] Sequential execution: execute step by step according to the order of operation steps, and only need to be confirmed once;

[0068] Concurrent execution: operation steps belonging to different load transfer blocks are executed simultaneously, and operation steps of the same load transfer block are executed sequentially;

[0069] Single-step and sequential execution failures can skip the failed lines to continue execution, and the execution process can lock the execution of associated line schemes.

[0070] The execution exception specifically includes: detecting a fault signal of a related line before and during execution, interrupting an execution scheme, and re-generating the scheme if load balancing still needs to be executed. In the case of a failure of switch control, manual intervention or automatic execution is supported to restore the original operation mode or expand the range of power supply. In the case of a failure of contact switch control, manual or automatic adjustment of the standby scheme is required before execution after verification. In the same way, a new power supply scheme is calculated for the untransferred load, and the transferred area and path are selected according to the new power supply scheme for power supply.

[0071] Figure 3 The detailed flowchart of load balancing for the embodiment 1 of the present application is provided.

[0072] The process of line load balancing includes: first, calculating the final target load reduction of the task line, then performing line topology analysis to determine all contact switches of the line, using the contact switches to determine the load on the opposite side, and judging whether the opposite line is overloaded. If the opposite line is not overloaded, it is determined whether the target load reduction is less than the allowed transfer-in amount, and the proposed switch is determined according to the result of the judgment, and the load rate of the two sides after power supply is calculated using the proposed switch.

[0073] The load balancing method further includes: displaying the results of the line load balancing, which specifically includes: task generation time, task description, power supply reason, calculation load section time, number of successful and unsuccessful transferred feeders, task status, and total power supply load data.

[0074] The process of calculating the final target load reduction of the task line includes: calculating a first target load reduction according to a threshold value and a second target load reduction according to an average load rate, judging the size of the first target load reduction and the second target load reduction, and taking the larger value as the final target load reduction.

[0075] The load imbalance rate is calculated, specifically:

[0076] The feeder load rate L = current value / current upper limit = I / I max ;

[0077]

[0078] Before determining the line load balancing, it is determined whether the line operation mode at that time is in a power supply state, whether the diagram model is correct, whether the contact switch is an automatic switch, and whether the line operation mode has a loop operation condition.

[0079] Then, the line topology analysis is performed to determine all contact switches of the line, the load on the opposite side is determined using the contact switches, and the process of judging whether the opposite line is overloaded includes:

[0080] A line topology analysis is performed to determine all tie switches of the current line, if the number of tie switches is less than 1, a record that the current line cannot perform load balancing is generated, if the number of tie switches is greater than or equal to 1, each tie switch is analyzed in sequence, and the opposite side load is determined, it is judged whether the opposite side line is overloaded, if yes, the next transferable tie switch is analyzed, and a record that load balancing cannot be performed is generated.

[0081] The process of judging whether the target load shedding amount is less than the allowed transfer-in amount and determining the tentative split switch according to the result includes: if the target load shedding amount is less than the target load shedding amount, searching from the tie switch to the main network load, searching for a switch greater than the target transfer-out amount and less than the opposite side allowed transfer-in amount as the tentative split switch, if not, searching from the main network load to the tie switch, and searching for a switch less than the opposite side allowed transfer-in amount as the tentative split switch.

[0082] In step S5, the load balancing scheme execution result is displayed and analyzed, specifically including: task generation time, task description, transfer-out reason, calculation load section time, number of transferred-out successful feeders and non-transferred-out successful feeders, task state, total transfer-out load data and the like.

[0083] After the load balancing scheme is executed successfully, the properties of the operated tie switch are automatically changed to sectional switches, the operated sectional switches are changed to tie switches, and the protection setting values should also be adjusted accordingly, and when the operation mode is restored, the original properties and setting values should also be changed back, so as to prevent power failure events or protection misoperation or inaction, and affect the safe operation of the power grid and the dispatching operation index.

[0084] In step S6, the original power supply mode before the load balancing transfer is restored, the section data before the task is generated is saved, the restoration mode is selected when the restoration is performed, and the original state operation sequence is generated.

[0085] The power distribution network dynamic load balancing method provided in Embodiment 1 of the present application is used for the case that the main distribution network device is overloaded due to the peak period of the power grid load, the main distribution network maintenance, the power grid fault, the change of the operation mode and the like, the network topology and the measurement data of the main distribution network are fully utilized to realize the monitoring and early warning of the overloaded device, the load balancing scheme is generated by comprehensively considering the line connection topology relationship, the controllability of the tie switch, the load rate of the opposite side line / main transformer and the like, the network topology is automatically or manually confirmed to be changed, and the load balancing is realized.

[0086] The power distribution network dynamic load balancing method provided in Embodiment 1 of the present application solves the problems of long time consumption and high operation risk of the traditional dispatching operation, provides intelligent support for dispatching decision, realizes the monitoring and early warning of the overloaded device, realizes the load balancing by changing the network topology, provides technical support for dispatching decision, and plays an important role in reducing the network loss and improving the voltage quality.

[0087] Embodiment 2

[0088] Based on the power distribution network dynamic load balancing method proposed in Embodiment 1 of the present application, Embodiment 2 of the present application further proposes a power distribution network dynamic load balancing system, Figure 4 A schematic diagram of the power distribution network dynamic load balancing system proposed in Embodiment 2 of the present application is shown in the figure, which comprises a balancing module.

[0089] The balancing module is used to start line load balancing when it is monitored that the power distribution network load is unbalanced, wherein the process of line load balancing comprises: firstly calculating the final target load shedding amount of the task line, then performing line topology analysis to determine all tie switches of the line, determining the opposite side load by using the tie switches, and judging whether the opposite side line is overloaded; if the opposite side line is not overloaded, judging whether the target load shedding amount is less than the allowed transfer-in amount, and determining the tentative separation switch according to the judgment result, and calculating the load rate of the two sides after transfer by using the tentative separation switch.

[0090] The system further comprises a display module; the process realized by the display module comprises: displaying the result of the line load balancing, and the result of the line load balancing specifically comprises: task generation time, task description, transfer reason, load section calculation time, number of transferred successful feeders and non-transferred successful feeders, task state and total transferred load data.

[0091] The process realized by the balancing module comprises: the power distribution network load unbalance specifically comprises: device overload lasting a first preset time, device overload lasting a second preset time, or load imbalance rate being greater than a preset threshold

[0092] The process of calculating the final target load shedding amount of the task line comprises: calculating a first target load shedding amount according to a threshold and a second target load shedding amount according to an average load rate, judging the size of the first target load shedding amount and the second target load shedding amount, and taking the larger value as the final target load shedding amount

[0093] The load imbalance rate is calculated, specifically as follows:

[0094] The feeder load rate L = current value / current upper limit = I / I max ;

[0095]

[0096] Before determining the line load balancing, it is determined whether the line operation mode at that time is a transfer state, whether the graph model is correct, whether the tie switch is an automatic switch, and whether the line operation mode appears a loop operation condition.

[0097] The process of performing line topology analysis to determine all tie switches of the line, determining the opposite side load by using the tie switches, and judging whether the opposite side line is overloaded comprises:

[0098] Line topology analysis is performed to determine all tie switches of the current line, if the number of tie switches is less than 1, a record that the current line cannot perform load balancing is generated, if the number of tie switches is greater than or equal to 1, each tie switch is analyzed in sequence, and the opposite side load is determined, it is judged whether the opposite side line is overloaded, if it is overloaded, the next transferable tie switch is analyzed, and a record that load balancing cannot be performed is generated.

[0099] The process of determining whether the target load shedding amount is less than the allowed transfer-in amount and determining the tentative split switch according to the result includes: if the target load shedding amount is less than the target load shedding amount, searching from the tie switch to the main network load, searching for a switch greater than the target transfer amount and less than the opposite side allowed transfer-in amount as the tentative split switch, if not found, searching from the main network load to the tie switch, searching for a switch less than the opposite side allowed transfer-in amount as the tentative split switch.

[0100] The power distribution network dynamic load balancing system provided in Embodiment 2 of the present application solves the problems of long time consumption and high operation risk of traditional dispatching operation, provides intelligent support for dispatching decision, realizes monitoring and early warning of overloaded equipment, realizes load balancing by changing network topology, provides technical support for dispatching decision, and plays an important role in reducing network loss and improving voltage quality.

[0101] The power distribution network dynamic load balancing system provided in Embodiment 2 of the present application solves the problems of long time consumption and high operation risk of traditional dispatching operation, provides intelligent support for dispatching decision, realizes monitoring and early warning of overloaded equipment, realizes load balancing by changing network topology, provides technical support for dispatching decision, and plays an important role in reducing network loss and improving voltage quality.

[0102] Embodiment 3

[0103] The present application also provides a device, Figure 5 The present application also provides a device,

[0104] The memory is used for storing the computer program;

[0105] The processor is used for executing the computer program to realize the method steps as follows:

[0106] In step S1, in order to fully utilize the main distribution network data, the interface of the distribution network and the main network information system is opened, the main and distribution network data and the graph model are connected, the full amount telemetry, remote signaling information and the graphic, model parameters of the substation side are accessed to the distribution automation master station for real-time monitoring, and the basis for topology analysis, loop closing phase angle difference calculation and main transformer load rate calculation is provided.

[0107] In step S2, when the peak period of power grid load, main distribution network maintenance, power grid failure, and operation mode change cause the main transformer or line to be overloaded or the load imbalance rate to reach the threshold value, dynamic load balancing is performed.

[0108] In step S3, a load balancing scheme is generated by comprehensively considering the line connection topology relationship, controllability of the tie switch, load rate of the line / main transformer on both sides, and the like, and the load transfer can be configured in semi-automatic or automatic mode.

[0109] In step S4, after confirmation, the load balancing is performed, and the execution process includes semi-automatic execution and automatic execution modes, and the semi-automatic mode includes simulation rehearsal, execution selection, execution scheme review, execution mode, and execution exception content; the automatic execution mode includes execution scheme review, execution mode, and execution exception content.

[0110] The process of line load balancing execution includes the process of calculating the final target load reduction of the task line, which includes calculating the first target load reduction according to the threshold value and calculating the second target load reduction according to the average load rate, judging the size of the first target load reduction and the second target load reduction, and taking the larger value as the final target load reduction.

[0111] The load imbalance rate is calculated, specifically as follows:

[0112] The feeder load rate L = current value / current upper limit = I / I max ;

[0113]

[0114] Before determining the line load balancing, it is determined whether the line operation mode at the time is a transfer supply state, whether the diagram model is correct, whether the tie switch is an automatic switch, and whether the line operation mode appears a loop operation condition.

[0115] Then, line topology analysis is performed to determine all tie switches of the line, the tie switches are used to determine the opposite side load, and the process of judging whether the opposite side line is overloaded includes: performing line topology analysis to determine all tie switches of the current line, if the number of tie switches is less than 1, a record that the current line cannot perform load balancing is generated; if the number of tie switches is greater than or equal to 1, each tie switch is analyzed in sequence to determine the opposite side load; it is judged whether the opposite side line is overloaded, if it is overloaded, the next transferable tie switch is analyzed, and a record that load balancing cannot be performed is generated.

[0116] The process of judging whether the target load shedding amount is less than the allowed transfer-in amount and determining the tentative separation switch according to the judging result includes: if the target load shedding amount is less than the target load shedding amount, searching from the tie switch to the main grid load, searching for a switch greater than the target transfer-out amount and less than the opposite allowed transfer-in amount as the tentative separation switch, and if no switch is searched, searching from the main grid load to the tie switch, searching for a switch less than the opposite allowed transfer-in amount as the tentative separation switch.

[0117] In step S5, the result of the load balancing scheme is analyzed, including: task generation time, task description, transfer-out reason, calculation load section time, number of successful transfer-out feeders and unsuccessful transfer-out feeders, task state, total transfer-out load data, etc.

[0118] In step S6, the original power supply mode before the load balancing transfer is restored, the section data before the task is generated is saved, the recovery mode is selected when the recovery is performed, and the operation sequence of the original state is generated.

[0119] The power distribution network dynamic load balancing equipment provided in embodiment 3 of the present application is used for the case that the main distribution network device is overloaded due to the power grid load peak period, main distribution network maintenance, power grid fault, operation mode change, etc., fully utilizes the main distribution network topology and measurement data, realizes the monitoring and early warning of the overloaded device, comprehensively considers the line connection topology relationship, controllability of the tie switch, opposite line / main transformer load rate and other conditions, generates a load balancing scheme, automatically or manually confirms the execution of the change of the network topology, and realizes the load balancing.

[0120] The power distribution network dynamic load balancing equipment provided in embodiment 3 of the present application solves the problem of long time consumption and high operation risk of the traditional dispatching operation, provides intelligent support for dispatching decision, realizes the monitoring and early warning of the overloaded device, realizes the load balancing by changing the network topology, provides technical support for the dispatching decision, plays an important role in reducing the network loss and improving the voltage quality, and has the advantages of the prior art.

[0121] It should be noted that the technical scheme of the present application also provides an electronic device, which comprises: a communication interface capable of interacting with other devices such as network devices; a processor connected with the communication interface to realize information interaction with other devices, used to run a computer program to execute the power distribution network dynamic load balancing method provided by one or more technical schemes, and the computer program is stored on a memory. Of course, in actual application, various components in the electronic device are coupled together through a bus system. It can be understood that the bus system is used to realize the connection and communication between the components. In addition to the data bus, the bus system also includes a power bus, a control bus and a state signal bus. The memory in the embodiment of the present application is used to store various types of data to support the operation of the electronic device. Examples of these data include any computer programs used to operate on the electronic device. It can be understood that the memory can be a volatile memory or a non-volatile memory, and can also include both volatile and non-volatile memories. Among them, the non-volatile memory can be a read-only memory (ROM, Read-Only Memory), a programmable read-only memory (PROM, Programmable Read-Only Memory), an erasable programmable read-only memory (EPROM, Erasable Programmable Read-Only Memory), an electrically erasable programmable read-only memory (EEPROM, Electrically Erasable Programmable Read-Only Memory), a ferromagnetic random access memory (FRAM, ferromagnetic random access memory), a flash memory (Flash Memory), a magnetic surface memory, an optical disc, or a compact disc read-only memory (CD-ROM, Compact Disc Read-Only Memory); the magnetic surface memory can be a disk memory or a tape memory. The volatile memory can be a random access memory (RAM, Random Access Memory) used as an external cache.By way of example, and not limitation, many forms of RAM can be used, such as Static Random Access Memory (SRAM), Synchronous Static Random Access Memory (SSRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic Random Access Memory (SDRAM), Double Data Rate Synchronous Dynamic Random Access Memory (DDR SDRAM), Enhanced Synchronous Dynamic Random Access Memory (ESDRAM), SyncLink Dynamic Random Access Memory (SLDRAM), Direct Rambus Random Access Memory (DRRAM). The memory described in embodiments of the present application is intended to include, but not be limited to, these and any other suitable types of memory. The methods disclosed in embodiments of the present application can be applied in or implemented by a processor. The processor can be an integrated circuit chip

[0122] The related part of the power distribution network dynamic load balancing device provided in the embodiment 3 of the present application can refer to the detailed description of the corresponding part in the power distribution network dynamic load balancing method provided in the embodiment 1 of the present application, and will not be repeated here.

[0123] It should be noted that, in this paper, the relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device inherent in the series of elements. Without more limitations, the element defined by the sentence "includes a" does not exclude the existence of other same elements in the process, method, article or device including the element. In addition, the above technical solutions provided by the embodiments of the present application have not been described in detail, so as not to be too repetitive.

[0124] The above describes the specific embodiments of the present application in combination with the drawings, but is not a limitation on the protection scope of the present application. For those skilled in the art, on the basis of the above description, other different forms of modification or deformation can also be made. Here, it is not necessary and impossible to enumerate all the embodiments. Various modifications or deformations made by those skilled in the art on the basis of the technical solutions of the present application without creative labor are still within the protection scope of the present application.

Claims

1. A method for dynamic load balancing of a power distribution network, characterized in that, The method comprises the following steps: The line load balancing is started when the unbalanced load of the power distribution network is monitored, and the process of the line load balancing comprises the following steps: firstly, the final target load shedding amount of the task line is calculated; then, line topology analysis is performed to determine all the tie switches of the line, the opposite side load is determined by using the tie switches, and it is judged whether the opposite side line is overloaded; if the opposite side line is not overloaded, it is judged whether the target load shedding amount is less than the allowed transfer-in amount, and the tentative transfer switch is determined according to the judgment result; and the load rates of the two sides after the transfer are calculated by using the tentative transfer switch. The process of calculating the final target load shedding amount of the task line comprises the following steps: the first target load shedding amount is calculated according to a threshold value, the second target load shedding amount is calculated according to an average load rate, the first target load shedding amount and the second target load shedding amount are compared, and the final target load shedding amount is the larger one. The process of then performing line topology analysis to determine all the tie switches of the line, determining the opposite side load by using the tie switches, and judging whether the opposite side line is overloaded comprises the following steps: The line topology analysis is performed to determine all the tie switches of the current line, if the number of the tie switches is less than 1, a record that the current line cannot perform load balancing is generated; if the number of the tie switches is greater than or equal to 1, each tie switch is analyzed in sequence, the opposite side load is determined, it is judged whether the opposite side line is overloaded, if the opposite side line is overloaded, the next transferable tie switch is analyzed, and a record that load balancing cannot be performed is generated. The process of judging whether the target load shedding amount is less than the allowed transfer-in amount and determining the tentative transfer switch according to the judgment result comprises the following steps: if the target load shedding amount is less than the target load shedding amount, the tie switch to the main network load is searched preferentially, the switch greater than the target transfer amount and less than the allowed transfer-in amount of the opposite side is searched as the tentative transfer switch, if no switch is searched, the main network load to the tie switch is searched, and the switch less than the allowed transfer-in amount of the opposite side is searched as the tentative transfer switch.

2. The method for dynamic load balancing of a power distribution network according to claim 1, wherein, The method further comprises: displaying the result of the line load balancing, and the result of the line load balancing specifically comprises: task generation time, task description, transfer reason, load section calculation time, number of transferred successful feeders and non-transferred successful feeders, task state and total transfer load data.

3. The method of claim 1, wherein, The unbalanced load of the power distribution network specifically comprises: that the equipment overload lasts for a first preset time, the equipment overload lasts for a second preset time, or the load imbalance rate is greater than a preset threshold value.

4. The method of claim 1, wherein, The method further comprises calculating the load imbalance rate, specifically as follows: Feeder load ratio L = current value / current upper limit = I / I max ; 5. The method for dynamic load balancing of a power distribution network according to claim 4, wherein, Before the line load balancing is determined, it is determined whether the line operation mode is in the transfer state, whether the graph model is correct, whether the tie switch is an automatic switch, and whether the line operation mode appears the loop closing operation condition.

6. A power distribution network dynamic load balancing system for performing the power distribution network dynamic load balancing method of any one of claims 1 to 5, characterized in that, The balancing module is used for starting the line load balancing when the unbalanced load of the power distribution network is monitored, and the process of the line load balancing comprises the following steps: firstly, the final target load shedding amount of the task line is calculated; then, line topology analysis is performed to determine all the tie switches of the line, the opposite side load is determined by using the tie switches, and it is judged whether the opposite side line is overloaded. ​ If the opposite side line is not overloaded, it is judged whether the target load shedding amount is less than the allowed transfer-in amount, and according to the judging result, a tentative switch is determined, and the load rates of the two sides after transfer are calculated by using the tentative switch.

7. A power distribution grid dynamic load balancing device, characterized by, The method comprises the steps that: a memory is used to store a computer program; a processor is used to execute the computer program to realize the method steps as claimed in any one of claims 1 to 5.

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