Load transfer intelligent analysis and auxiliary decision-making method

Abstract

The invention discloses a load transfer intelligent analysis and auxiliary decision-making method, which comprises the following steps: obtaining a power grid model and ground state section data through model management and state estimation, carrying out equipment power failure and out-of-limit transfer analysis, and adopting a parallel computing and servitization mode to carry out load transfer analysis; and a load transfer auxiliary decision is provided for real-time monitoring applications such as fault co-processing, analysis and check applications such as accident plan generation, and scheduling management applications such as maintenance plans, so that the risk level of the power grid can be determined according to specification requirements. According to the method, power failure and out-of-limit equipment are selected, a corresponding load transfer scheme is obtained through automatic calculation, affected important users are analyzed and clearly displayed in front of a dispatcher to serve as a reminding and auxiliary basis, and overload load transfer time can be shortened to a certain degree.

Description

Technical Field

[0001] The present invention belongs to the technical field of load transfer intelligent analysis, and in particular relates to a load transfer intelligent analysis and auxiliary decision-making method. Background Art

[0002] Research on system risk assessment technology, assessing the system's ability to withstand severe fault disturbances and extreme events, and actively responding to potential safety risks in the field of new energy power can improve the power system's emergency response capabilities in the face of emergencies and provide reference for emergency management of the power system. The introduction of a high proportion of renewable energy has not changed the distribution network's requirements for safety, and safety is still the main limiting factor for the amount of connected load and renewable energy. When the penetration rate is low, its power generation is consumed locally by the same node load at the low-voltage layer, which is equivalent to offsetting part of the load and has little impact on the safety of the distribution network. As the penetration rate increases, bidirectional power flows will appear on the line, and the intermittent nature of renewable energy increases the randomness of the power flow, which will have a great impact on system safety. It can be seen that the transfer path analysis and corresponding auxiliary decision-making are not practical and take a long time. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a load transfer intelligent analysis and auxiliary decision-making method, which is based on PAS (power system advanced application software), obtains power grid model and base state section data through model management and state estimation, conducts equipment power outage and over-limit transfer analysis, and adopts parallel computing and service-oriented methods to provide load transfer auxiliary decision-making to real-time monitoring applications such as fault collaborative disposal, analysis and verification applications such as accident plan generation, and dispatching management applications such as maintenance plans, so that the risk level of the power grid can be determined according to the specification requirements. The present invention selects power outage and over-limit equipment, automatically calculates the corresponding load transfer plan, analyzes the important users affected, and clearly displays it in front of the dispatcher as a reminder and auxiliary basis, which can shorten the overload load transfer time to a certain extent, realize the dispatcher and automation personnel to shorten the risk analysis time of power transfer during large power grid fault power outage and planned power outage, and intelligent decision-making quickly, accurately and timely formulates the power transfer plan to ensure the stable operation of the power grid.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] A load transfer intelligent analysis and auxiliary decision-making method comprises the following steps:

[0006] Step 1: Manage the load transfer event and set the load transfer event, including the transfer equipment and transfer type.

[0007] Step 2: Process the power transfer base state section and set the power transfer analysis section, including the setting of the power grid model, operation data and power transfer parameters;

[0008] Step 3: Perform power outage transfer analysis, determine the load power outage transfer analysis process according to the voltage level of the power-off equipment, and complete the main grid power outage transfer strategy analysis;

[0009] Step 4: Conduct over-limit power transfer analysis, determine the load over-limit power transfer analysis process according to the over-limit equipment voltage level, and complete the main grid over-limit power transfer strategy analysis;

[0010] Step 5: Display the results of the power transfer strategy. Display the results of the power transfer strategy analysis. The displayed content includes power transfer plan information, automatic power transfer path mapping, power outage information list, and power transfer risk information prompts.

[0011] Furthermore, in step 1, the setting of the transfer device includes adding and deleting the device; the setting of the transfer type includes power failure of the device and over-limit of the device.

[0012] Furthermore, in the step 2, the transfer section includes a historical section, a real-time section and a mode section; the transfer parameter settings include: transfer mode, standby automatic start-up operation mode, and over-limit transfer quantity; the transfer mode includes power outage transfer and over-limit transfer; the standby automatic start-up operation mode includes start-up and withdrawal.

[0013] Furthermore, in step 3, the main grid power outage transfer strategy analysis includes: restoring equipment in descending order according to the voltage level of the power-off equipment and the voltage level of the plant to which the equipment belongs; analyzing the power transfer strategy by transferring power out and communicating within the station, excluding maintenance equipment and faulty equipment, and considering the equipment load rate on the transfer path, the power supply reliability of important users, and the weak operation mode of the power grid to prioritize the strategies; each time a layer of voltage level power supply equipment is restored, the power-off area and the set of power-off equipment are recalculated, and the calculation is iterated in sequence.

[0014] Furthermore, in step 4, the main network over-limit power transfer strategy analysis includes: analyzing in sequence from high to low according to the voltage level of the over-limit equipment and the voltage level of the plant to which the equipment belongs, adopting the method of transferring out and communicating within the station to analyze the power transfer strategy, excluding maintenance equipment and faulty equipment, considering factors such as equipment load rate and power supply reliability for important users, and performing strategy priority sorting; for each layer of voltage level power supply equipment transferred, recalculate whether the goal of eliminating the over-limit is achieved, and iterate the calculation in sequence.

[0015] Furthermore, in step 5, the power transfer scheme information is a specific switch operation sequence for the power transfer, information on power-off devices that will be restored after the switch is operated, and a list of power transfer lines.

[0016] Furthermore, in step 5, the transfer path is automatically mapped as a transfer path diagram of the transfer scheme, including automatic mapping and topological coloring of local wiring in the fault area, and displaying information of operable switches for transfer.

[0017] Furthermore, in step 5, the power outage information list is power outage equipment information generated according to the main grid power transfer plan, including power outage equipment, equipment type, important users, and loss load.

[0018] Furthermore, in step 5, the risk information of the supply transfer is: the newly added over-limit equipment information and the newly added weak operating mode after the supply transfer, wherein the weak operating modes include a single line in a plant or station, a single main transformer in a plant or station, a single line and a single transformer, a multi-line single power supply in a plant or station, and a single power supply for important users.

[0019] Beneficial effects:

[0020] Compared with the prior art, the present invention selects power outage and over-limit equipment, can automatically calculate the corresponding load transfer plan, analyze the important users affected, and clearly display it on the dispatcher interface as a necessary reminder and auxiliary basis, which can shorten the overload load transfer time to a certain extent. The present invention is aimed at the over-limit and power outage application scenarios of equipment of different voltage levels (including main transformers, busbars, lines, distribution network feeders, distribution network switches, etc.), considering factors such as power grid operation mode, dual power sources of important users, equipment load rate, and equipment operation status. Based on the specified base state section, the main and distribution integrated network topology search algorithm is used to generate a reasonable load transfer path, and multiple optional transfer plans are screened and sorted according to the priority of the transfer strategy, and the best plan is recommended to provide load transfer auxiliary decision-making for dispatching operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A system diagram of the load transfer intelligent analysis and auxiliary decision-making method of the present invention;

[0022] Figure 2 The present invention is a flow chart of the load transfer intelligent analysis and auxiliary decision-making method. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other. The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0024] like Figure 1-Figure 2 As shown, a load transfer intelligent analysis and auxiliary decision-making method of the present invention comprises the following steps:

[0025] Step 1: Manage the load transfer event, including: setting the load transfer event, including the setting of the transfer equipment and the transfer type.

[0026] Among them, the settings of the transfer equipment include adding and deleting equipment; the settings of the transfer type include equipment power failure and equipment exceeding the limit.

[0027] Step 2: Processing the base state section of power transfer, including: setting the power transfer analysis section, including the power grid model, operation data and power transfer parameter settings.

[0028] Among them, the transfer section includes historical section, real-time section and mode section; the transfer parameter settings include transfer mode (power outage transfer, over-limit transfer), standby automatic start-up operation mode (start, stop), and over-limit transfer quantity setting.

[0029] Step 3: Conduct power outage transfer analysis, including: determining the load power outage transfer analysis process according to the voltage level of the power-off equipment, and completing the main grid power outage transfer strategy analysis.

[0030] Specifically, in step 3, the main grid power outage transfer strategy analysis includes:

[0031] According to the voltage level of the power-off equipment (busbar) and the voltage level of the plant to which the equipment belongs, power supply is restored from high to low. Each time a voltage level power supply equipment (busbar) is restored, the power-off area and the set of power-off equipment are recalculated and calculated iteratively. For the power-off distribution network feeder, the main network sends a transfer analysis request to the distribution network, and the distribution network performs a transfer analysis, including the load transfer path, transfer amount and risk verification results of the feeder to be transferred.

[0032] (1) Principle of transfer

[0033] Carry out load transfer strategy analysis after considering anticipated or real-time fault backup automatic transfer action. According to the type of outgoing load on the bus, there are three ways of 110kV bus outgoing line transfer in 220kV station: transfer of all outgoing loads, bus series supply, and bus coupling within the station.

[0034] The mode of transferring all outgoing loads is: transferring outgoing loads through 110kV plant stations. The transfer modes are divided into 110kV station hot standby supply lines, 110kV station and 110kV combined busbar transfer;

[0035] Series bus power supply: The series supply methods are divided into tie line series supply and 110kV station series supply, among which the 110kV station series supply is divided into hot standby line series supply and 110kV station 110kV bus series supply;

[0036] In-station busbar combination: combine 110kV busbar in 220kV station.

[0037] (2) Supply transfer analysis

[0038] Transfer all outgoing loads: When all outgoing loads have plans to be transferred to other plants and stations, all outgoing loads will be transferred away, and the voltage-depleted busbar will not resume power supply.

[0039] Series supply busbar power supply (series supply lines are generally hot standby interconnection lines, try not to select 110kV stations and busbars for series supply, this solution can be selected in special circumstances). Specifically include: series supply lines without 110kV plant and station outgoing lines are interconnection lines (all outgoing line loads that can be transferred on the bus are transferred, and those that cannot be transferred are restored through series supply through interconnection lines); series supply lines with 110kV plant and station outgoing lines are interconnection lines with T-connections (nodes where three lines intersect) other 110kV plants and stations (all outgoing line loads that can be transferred on the bus are transferred, and those that cannot be transferred are restored through series supply through interconnection lines).

[0040] Through the 110kV power plant and station, two 220kV power plants and stations are connected to supply power to the same 110kV (all other outgoing lines that can be transferred are transferred).

[0041] The busbar in the station can be closed by closing the 110kV busbar in the 220kV station to restore power supply to the lost busbar.

[0042] Step 4: Conduct over-limit power transfer analysis, including: determining the load over-limit power transfer analysis process according to the over-limit equipment voltage level, and completing the main grid over-limit power transfer strategy analysis.

[0043] Specifically, in step 4, the main network over-limit transfer strategy analysis includes:

[0044] (1) Refer to the analysis principle of power transfer during power outage of the main grid, and analyze the power transfer strategy according to the methods of power transfer out, power transfer in, and inter-station communication. Consider the commissioning of hot standby contact lines or contact switches. For the busbars of the same voltage level associated with the over-limit equipment, by analyzing the AC line segments on the busbars and the knife switches and switches at the same interval as the AC line segments, determine whether a connection path can be established through the hot standby contact lines or contact switches, and finally generate a power transfer path that can eliminate the over-limit. The AC line segments on the connection path cannot be under maintenance, the knife switches must all be in the closed position, and one or more switches must be in the open position.

[0045] (2) For the distribution network feeders that need to be adjusted, the main grid sends a transfer analysis request to the distribution network, which then conducts a transfer analysis, including the load transfer path, transfer amount, and risk verification results of the feeder.

[0046] Step 5: Display the results of the power transfer strategy, including: displaying the analysis results of the power outage and over-limit power transfer strategies respectively.

[0047] Among them, the displayed content includes transfer plan information, automatic mapping of transfer routes, power outage information list, and transfer risk information prompts.

[0048] (1) The transfer plan information provides the specific switch operation sequence for the transfer, as well as the information of the power-off equipment that will be restored after the switch is operated and the list of transfer lines.

[0049] (2) Automatic mapping of the transfer path The transfer path diagram of the transfer plan is displayed, including automatic mapping and topological coloring of the local wiring in the fault area, and displaying the information of the operable switches for transfer.

[0050] (3) Generate a power outage information list based on the main grid transfer plan, including information such as power outage equipment, equipment type, important users, and loss load.

[0051] (4) The risk information of the supply transfer shall display the information of the newly added over-limit equipment and the newly added weak operating modes after the supply transfer. The weak operating modes include: single line in the plant or station, single main transformer in the plant or station, single transformer in a single line, single power supply for multiple lines in the plant or station, and single power supply for important users.

[0052] Dispatching and automation personnel conduct relevant analysis and judgment through the network topology and real-time data of the system software function modules, and conduct comprehensive screening, judgment, analysis, and classification based on the characteristics of some common risks and custom risks, as well as risk triggering conditions and requirements, and provide accurate and comprehensive prompts for possible risks. This function can provide necessary reminders and auxiliary basis for dispatching personnel to perform operations and troubleshooting.

[0053] The method of the present invention is run in PAS and mainly realizes the following functions:

[0054] 1) Transfer event management: Set up load transfer events, including the transfer equipment and transfer type.

[0055] 2) Power transfer base state section processing: Set up the power transfer analysis section, including the power grid model, operation data and power transfer parameter settings.

[0056] 3) Power outage and power transfer analysis: According to the voltage level of the power-off equipment, determine the load power outage and power transfer analysis process and complete the main grid power outage and power transfer strategy analysis.

[0057] 4) Over-limit power transfer analysis: According to the voltage level of the over-limit equipment, determine the load over-limit power transfer analysis process and complete the over-limit power transfer strategy analysis of the main grid.

[0058] 5) Display of power transfer strategy results: Display the power transfer strategy analysis results, including power transfer plan information, automatic power transfer path mapping, power outage information list, and power transfer risk information prompts.

[0059] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A load transfer intelligent analysis and auxiliary decision-making method, characterized in that: The steps include: Step 1: Manage the load transfer event and set the load transfer event, including the transfer equipment and transfer type. Step 2: Process the power transfer base state section and set the power transfer analysis section, including the setting of the power grid model, operation data and power transfer parameters; Step 3: Perform power outage transfer analysis, determine the load power outage transfer analysis process according to the voltage level of the power-off equipment, and complete the main grid power outage transfer strategy analysis; Step 4: Conduct over-limit power transfer analysis, determine the load over-limit power transfer analysis process according to the over-limit equipment voltage level, and complete the main grid over-limit power transfer strategy analysis; Step 5: Display the results of the power transfer strategy. Display the results of the power transfer strategy analysis. The displayed content includes power transfer plan information, automatic power transfer path mapping, power outage information list, and power transfer risk information prompts.

2. A load transfer intelligent analysis and auxiliary decision-making method according to claim 1, characterized in that: In step 1, the setting of the transfer device includes adding and deleting the device; the setting of the transfer type includes power failure of the device and over-limit of the device.

3. The load transfer intelligent analysis and auxiliary decision-making method according to claim 1 is characterized in that: In step 2, the transfer section includes a historical section, a real-time section and a mode section; The power transfer parameter settings include: power transfer mode, standby automatic start-up operation mode, and over-limit power transfer quantity; the power transfer mode includes power outage power transfer and over-limit power transfer; the standby automatic start-up operation mode includes start and stop.

4. The method for intelligent analysis and auxiliary decision-making of load transfer according to claim 1, characterized in that: In step 3, the main grid power outage transfer strategy analysis includes: according to the voltage level of the power-off equipment and the voltage level of the plant to which the equipment belongs, the equipment is restored in order from high to low; the transfer strategy is analyzed by transferring out and communicating within the station, and maintenance equipment and faulty equipment are excluded. The equipment load rate on the transfer path, the power supply reliability of important users, and the weak operation mode of the power grid are considered to prioritize the strategies; each time a layer of voltage level power supply equipment is restored, the power-off area and the set of power-off equipment are recalculated, and the calculation is iterated in sequence.

5. The method for intelligent analysis and auxiliary decision-making of load transfer according to claim 1, characterized in that: In step 4, the main network over-limit transfer strategy analysis includes: analyzing in sequence from high to low according to the voltage level of the over-limit equipment and the voltage level of the plant to which the equipment belongs, adopting the transfer and in-station communication method to analyze the transfer strategy, excluding maintenance equipment and faulty equipment, considering factors such as equipment load rate and power supply reliability of important users, and ranking the strategy priorities; each time a voltage level power supply equipment is transferred, recalculate whether the goal of eliminating the over-limit is achieved, and iterate the calculation in sequence.

6. A load transfer intelligent analysis and auxiliary decision-making method according to claim 1, characterized in that: In step 5, the power transfer plan information includes a specific switch operation sequence for the power transfer, information about power-off devices that will be restored after the switch is operated, and a list of power transfer lines.

7. The load transfer intelligent analysis and auxiliary decision-making method according to claim 1 is characterized in that: In the step 5, the transfer path is automatically mapped into a transfer path diagram of the transfer scheme, including automatic mapping and topological coloring of local wiring in the fault area, and displaying information of operable switches for transfer.

8. The method for intelligent analysis and auxiliary decision-making of load transfer according to claim 1, characterized in that: In step 5, the power outage information list is the power outage equipment information generated according to the main network transfer plan, including power outage equipment, equipment type, important users, and loss load.

9. The method for intelligent analysis and auxiliary decision-making of load transfer according to claim 1, characterized in that: In step 5, the risk information of the supply transfer is: the newly added over-limit equipment information and the newly added weak operating mode after the supply transfer, wherein the weak operating modes include a single line in a plant or station, a single main transformer in a plant or station, a single line and a single transformer, a multi-line single power supply in a plant or station, and a single power supply for important users.

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