A distribution network load precise control method based on master coordination

Abstract

The application discloses a kind of based on main coordination's distribution network load precision control method of coordination, including by provincial dispatching automation system Cut-off load target value instruction is issued to regional control system;In response to Cut-off load target value instruction, regional control system inquires whether there is special line load, if there is special line load, then cut-off special line load and calculate remaining cut-off load target value, generate remaining cut-off load target value instruction and issue to regional distribution network system;In response to remaining cut-off load target value instruction, regional distribution network system according to pre-constructed controllable load resource pool inquires each cut-off load and corresponding cut-off load amount, based on each cut-off load and corresponding cut-off load amount according to pre-set control strategy Generation control scheme, according to control scheme carries out distribution network load precision control;The application can accurately cut off part of load, reduce the influence of power grid power imbalance, maintain power system stable operation.

Description

Technical Field

[0001] This invention relates to a method for precise control of distribution network load based on primary and secondary coordination, belonging to the field of power system technology. Background Technology

[0002] In recent years, my country's economy has experienced sustained and rapid growth, leading to a surge in electricity demand. However, current power infrastructure development lags behind, failing to keep pace with the continuously increasing demand, resulting in frequent power shortages. When there is insufficient supply of energy sources such as coal and gas, or during extreme weather events, the national power gap will widen further. To avoid and mitigate the severe impacts of such problems, safe and effective control measures are needed, especially in emergency situations, to ensure the safe and stable operation of the power system. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a method for precise load control of distribution networks based on main and distribution coordination. This method can accurately cut off part of the load when there is a power shortage, reduce the impact of power imbalance in the power grid, and maintain the stable operation of the power system.

[0004] To achieve the above objectives, the present invention is implemented using the following technical solution:

[0005] This invention provides a method for precise load control in a distribution network based on primary and secondary coordination, comprising:

[0006] The provincial-level dispatch automation system sends the load shedding target value instruction to the regional control system.

[0007] In response to the load shedding target value command, the regional control system queries whether there is dedicated line load. If there is dedicated line load, the dedicated line load is shedding and the remaining load shedding target value is calculated. The remaining load shedding target value command is generated and sent to the regional distribution network system.

[0008] In response to the remaining load cut-off target value command, the regional distribution network system queries each cut-off load and its corresponding cut-off load amount according to the pre-built controllable load resource pool. Based on each cut-off load and its corresponding cut-off load amount, it generates a control scheme according to the preset control strategy and performs precise control of the distribution network load according to the control scheme.

[0009] Optionally, if there is no dedicated line load, the load shedding target value instruction will be sent to the regional distribution network system as the remaining load shedding target value instruction.

[0010] Optionally, the controllable load resource pool is constructed from the attribute information of each user load maintained in the PMS system, and the controllable load resource pool is updated every preset periodic time.

[0011] Optionally, the query for resectable load and the corresponding resectable load amount includes:

[0012] Obtain attribute information of each user's load from the PMS system. The attribute information includes communication status, remote signaling status, and load that can be cut off.

[0013] The communication status and remote signaling status of each user load are verified. Each user load that passes the verification is designated as a load that can be cut off, and the amount of load that can be cut off for each user load that passes the verification is designated as the amount of load that can be cut off for each load.

[0014] Optionally, the generation of a control scheme based on each rescindable load and its corresponding rescindable load amount according to a preset control strategy includes:

[0015] Each rescuable load is grouped into a rescuable load set U. set :

[0016] U set =[U1,U2,…,U n ,…,U N ]

[0017] In the formula, U n Let n be the load that can be cut off, where n = 1, 2, ..., N, and N is the number of loads that can be cut off.

[0018] The amount of each reversible load is summarized into a set of reversible load amounts X. set :

[0019] X set =[X1,X2,…,X n ,…,X N ]

[0020] In the formula, X n Let n be the amount of the load that can be cut off;

[0021] Divide a day into minutes to obtain minute-by-minute time intervals, and then summarize these minute-by-minute time intervals into a set t. set :

[0022] t set =[1,2,…,1440]

[0023] Based on the set of minute intervals, select the start and end times. Use the start time, end time, and the minute intervals between them as adjustment times. Summarize these adjustment times into an adjustment time set t. ad :

[0024] t ad =[t s ,ts +1,…,t s +T,t e ]

[0025] In the formula, t s Let t be the starting time. e The start time is the end time, and T is the number of minutes between the start time and the end time.

[0026] Let t = t s ,t s +1,…,t s +T,t e Then, the load shedding amount X of the load n that can be shedding at each adjustment time t is... n (t):

[0027] X n (t)=[X n (t s ),X n (t s +1),…,X n (t s +T),X n (t e )],

[0028]

[0029] In the formula, X k (t), To adjust the load shedding amount and the maximum value of the load shedding amount at time t;

[0030] Calculate the total load Y(t) to be removed at adjustment time t based on the load removed at adjustment time t:

[0031]

[0032] Calculate the ratio θ(t) of the total load shedding Y(t) at adjustment time t to the remaining target load shedding value:

[0033]

[0034] In the formula, Y r The target value for the remaining shearing load;

[0035] Calculate the average value of the ratio corresponding to each adjustment time t.

[0036]

[0037] average of the ratios Minimize the load shedding amount X of the shedding load n at each adjustment time t as the objective function. n (t) is used to solve;

[0038] The solution results will be used as the control plan.

[0039] Optionally, the precise control of distribution network load according to the control scheme includes:

[0040] Generate power outage and restriction plans based on the control scheme;

[0041] The power outage and restriction plan is pushed to the OMS system for approval. If the approval is granted, the regional distribution network system executes the power outage and restriction plan, records the actual load shelving, and returns the data to the regional control system for archiving and future reference.

[0042] Optionally, generating the power outage and restriction scheme according to the control scheme includes: compiling the operation modes of boundary switches, branch switches, section switches, and outgoing line switches based on the load shedding amount of the shedding load at each control time.

[0043] Optionally, the regional control system and the regional distribution network system exchange information using E-files.

[0044] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0045] This invention provides a method for precise load control in distribution networks based on primary and secondary coordination. Through a real-time maintained controllable load resource pool, it allows for easy querying of each switchable load and its corresponding amount. Based on a control strategy, it can generate corresponding control schemes according to the switchable loads and their corresponding amounts, achieving precise load control in the distribution network. This invention enables refined management of load control in scenarios where power supply gaps occur in the distribution network, reducing power imbalance in the network and maintaining stable system operation. Attached Figure Description

[0046] Figure 1 This is a flowchart of a precise load control method for distribution networks based on primary and secondary coordination, provided in Embodiment 1 of the present invention;

[0047] Figure 2 This is a connection diagram of a precise load control method for distribution networks based on primary and secondary coordination, provided in Embodiment 1 of the present invention. Detailed Implementation

[0048] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0049] Example 1:

[0050] like Figure 1 As shown, this embodiment of the invention provides a method for precise control of distribution network load based on master-distribution coordination, including the following steps:

[0051] 1. The load shedding target value instruction is issued to the regional control system through the provincial dispatch automation system;

[0052] 2. In response to the load shedding target value command, the regional control system checks whether there is dedicated line load:

[0053] If there is dedicated line load, the dedicated line load is disconnected and the target value of the remaining disconnected load is calculated. The remaining disconnected load target value instruction is generated and sent to the regional distribution network system.

[0054] If there is no dedicated line load, the load shedding target value instruction will be sent to the regional distribution network system as the remaining load shedding target value instruction.

[0055] In this embodiment, the dedicated line load is a 10-110KV dedicated line load.

[0056] 3. In response to the remaining load cut-off target value command, the regional distribution network system queries each cut-off load and its corresponding cut-off load amount according to the pre-built controllable load resource pool. Based on each cut-off load and its corresponding cut-off load amount, it generates a control scheme according to the preset control strategy and performs precise control of the distribution network load according to the control scheme.

[0057] 3.1 The controllable load resource pool is constructed from the attribute information of each user load maintained in the PMS system, and the controllable load resource pool is updated every preset periodic time.

[0058] 3.2. Querying the resectable load and the corresponding resectable load amount includes:

[0059] Obtain the attribute information of each user's load from the PMS system. The attribute information includes communication status, remote signaling status, and load that can be cut off.

[0060] The communication status and remote signaling status of each user load are verified. Each user load that passes the verification is designated as a load that can be cut off, and the amount of load that can be cut off for each user load that passes the verification is designated as the amount of load that can be cut off for each load.

[0061] 3.3. Based on each reversible load and its corresponding reversible load amount, a control scheme is generated according to a preset control strategy, including:

[0062] Each rescuable load is grouped into a rescuable load set U. set :

[0063] U set =[U1,U2,…,U n ,…,UN ]

[0064] In the formula, U n Let n be the load that can be cut off, where n = 1, 2, ..., N, and N is the number of loads that can be cut off.

[0065] The amount of each reversible load is summarized into a set of reversible load amounts X. set :

[0066] X set =[X1,X2,…,X n ,…,X N ]

[0067] In the formula, X n Let n be the amount of the load that can be cut off;

[0068] Divide a day into minutes to obtain minute-by-minute time intervals, and then summarize these minute-by-minute time intervals into a set t. set :

[0069] t set =[1,2,…,1440]

[0070] Based on the set of minute intervals, select the start and end times. Use the start time, end time, and the minute intervals between them as adjustment times. Summarize these adjustment times into an adjustment time set t. ad :

[0071] t ad =[t s ,t s +1,…,t s +T,t e ]

[0072] In the formula, t s Let t be the starting time. e The start time is the end time, and T is the number of minutes between the start time and the end time.

[0073] Let t = t s ,t s +1,…,t s +T,t e Then, the load shedding amount X of the load n that can be shedding at each adjustment time t is... n (t):

[0074] X n (t)=[X n (t s ),X n (t s +1),…,X n (t s+T),X n (t e )],

[0075]

[0076] In the formula, X k (t), To adjust the load shedding amount and the maximum value of the load shedding amount at time t;

[0077] Calculate the total load Y(t) to be removed at adjustment time t based on the load removed at adjustment time t:

[0078]

[0079] Calculate the ratio θ(t) of the total load shedding Y(t) at adjustment time t to the remaining target load shedding value:

[0080]

[0081] In the formula, Y r The target value for the remaining shearing load;

[0082] Calculate the average value of the ratio corresponding to each adjustment time t.

[0083]

[0084] average of the ratios Minimize the load shedding amount X of the shedding load n at each adjustment time t as the objective function. n (t) is used to solve;

[0085] The solution results will be used as the control plan.

[0086] 3.4. Precise control of distribution network load according to the control plan includes:

[0087] The power outage and restriction plan is generated according to the control scheme. The generation of the power outage and restriction plan according to the control scheme includes: compiling the operation mode of boundary switches, branch switches, section switches and outgoing switches based on the load shedding amount of the load that can be shelved at each control time.

[0088] The power outage and restriction plan is pushed to the OMS system for approval. If the approval is granted, the regional distribution network system executes the power outage and restriction plan, records the actual load shelving, and returns the data to the regional control system for archiving and future reference.

[0089] 3.5 The regional control system and the regional distribution network system exchange information via E-files. Taking control commands as an example, the information exchange process includes:

[0090] First handshake: The regional control system sends a control command (i.e., the remaining load shedding target value command) to the regional distribution network system, and the regional distribution network system replies with a confirmation of the control command within a preset first time period;

[0091] Second handshake: The regional control system issues the execution command for control and waits for the regional distribution network system to reply with confirmation of the execution command within a preset second time period;

[0092] The third handshake: The regional distribution network system replies with a confirmation execution command, and the regional control system receives the confirmation execution command.

[0093] In this embodiment, both the first duration and the second duration are set to 300s.

[0094] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0095] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0096] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for precise load control in a distribution network based on primary and secondary distribution coordination, characterized in that, include: The provincial-level dispatch automation system sends the load shedding target value instruction to the regional control system. In response to the load shedding target value command, the regional control system queries whether there is dedicated line load. If there is dedicated line load, the dedicated line load is shedding and the remaining load shedding target value is calculated. The remaining load shedding target value command is generated and sent to the regional distribution network system. In response to the remaining load cut-off target value command, the regional distribution network system queries each cut-off load and its corresponding cut-off load amount according to the pre-built controllable load resource pool. Based on each cut-off load and its corresponding cut-off load amount, it generates a control scheme according to the preset control strategy and performs precise control of the distribution network load according to the control scheme. The step of generating a control scheme based on each reversible load and its corresponding reversible load amount according to a preset control strategy includes: Each resectable load is categorized into a resectable load set. : In the formula, For removable load , , The number of removable loads; The resectable load amounts of each resectable load are summarized into a resectable load amount set. : In the formula, For removable load The removable load; Divide the day into minutes to obtain minute-by-minute moments, and then summarize these minute-by-minute moments into a set. : Based on the set of minute intervals, select the start and end times, and use the start time, end time, and the minute intervals between the start and end times as adjustment times. Summarize all adjustment times into an adjustment time set. : In the formula, At the start time, The end time, The number of minutes between the start and end times; make Then each adjustment time Removable load Resection load : In the formula, To adjust the time The amount of load removed and the maximum value of the load removed; According to the adjustment time Calculation of shearing load and adjustment time Total resection load : Calculate adjustment time Total resection load Ratio to the target value of residual shearing load : In the formula, The target value for the remaining shearing load; Calculate each adjustment time The average of corresponding ratios : average of the ratios Minimize the objective function at each adjustment time. Removable load Resection load Solve the problem; The solution results will be used as the control plan.

2. The method for precise load control of a distribution network based on primary and secondary coordination as described in claim 1, characterized in that, If there is no dedicated line load, the load shedding target value instruction will be sent to the regional distribution network system as the remaining load shedding target value instruction.

3. The method for precise load control of a distribution network based on primary and secondary coordination as described in claim 1, characterized in that, The controllable load resource pool is constructed from the attribute information of each user load maintained in the PMS system, and the controllable load resource pool is updated every preset periodic time.

4. The method for precise load control of a distribution network based on primary and secondary coordination as described in claim 1, characterized in that, The query for resectable payloads and the corresponding resectable payload amounts include: Obtain attribute information of each user's load from the PMS system. The attribute information includes communication status, remote signaling status, and load that can be cut off. The communication status and remote signaling status of each user load are verified. Each user load that passes the verification is designated as a load that can be cut off, and the amount of load that can be cut off for each user load that passes the verification is designated as the amount of load that can be cut off for each load.

5. The method for precise load control of a distribution network based on primary and secondary coordination according to claim 1, characterized in that, The precise control of distribution network load according to the control scheme includes: Generate power outage and restriction plans based on the control scheme; The power outage and restriction plan is pushed to the OMS system for approval. If the approval is granted, the regional distribution network system executes the power outage and restriction plan, records the actual load shelving, and returns the data to the regional control system for archiving and future reference.

6. The method for precise load control of a distribution network based on primary and secondary coordination according to claim 5, characterized in that, The generation of power outage and restriction schemes based on the control scheme includes: compiling the operation modes of boundary switches, branch switches, section switches, and outgoing line switches based on the load shedding amount of the shedding load at each control time.

7. A method for precise load control of a distribution network based on primary and secondary distribution coordination as described in claim 5, characterized in that, The regional control system and the regional distribution network system exchange information via E-files.

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