Safety correction auxiliary decision method and device based on balance adjustment of specific unit group

Abstract

The application discloses a kind of based on specific group of units balance adjustment safety correction auxiliary decision-making method and device, obtain safety correction auxiliary decision-making basic data;According to basic data, eliminate equipment overrun quantity, and obtain unit output adjustment quantity;After equipment overrun quantity elimination succeeds, calculate group of units adjustment demand according to unit output adjustment quantity;According to group of units adjustment demand, carry out group of units within unit output balance adjustment;After adjustment succeeds, the unit output of group of units within adjusted is warehoused, simultaneously sent to AGC tracking execution.The safety correction auxiliary decision-making method and device based on specific group of units balance adjustment provided by the application provide auxiliary decision-making method for the rapid adjustment of group of units output plan under new type power system uncertainty scenario.

Description

Technical Field

[0001] This invention relates to a safety correction auxiliary decision-making method and device based on the balance adjustment of a specific group of generating units, belonging to the field of power dispatch automation technology. Background Technology

[0002] With the rapid advancement of the construction of new power systems, new energy sources such as wind power and photovoltaics are gradually becoming the main power sources. The scale of adjustable resources on the load side is gradually expanding, and there are more and more uncertainties in the actual operation of the power grid, which seriously affects the safe and stable operation of the power grid.

[0003] Safety is the bottom-line requirement for the new power system, which should be a highly secure system that fully guarantees energy security and social development. Currently, my country's large-scale AC / DC hybrid power grid structure across multiple regions is becoming increasingly complex. The scale of intermittent and fluctuating renewable energy generation connected to the grid is rapidly expanding, and the application rate of new power electronic equipment has increased significantly. These developments have drastically altered the operating patterns and characteristics of the traditional power system, making it prone to power supply security issues under special circumstances. The new power system must innovate and develop in theoretical analysis, control methods, and regulation mechanisms to address the growing safety risks and challenges.

[0004] Currently, the multi-cycle power generation plan optimization technology under the three-level (open, fair, and transparent) dispatch model in China is maturing and has been widely applied to the State Grid's provincial-level three-level dispatch technical support system. With the rapid advancement of the electricity spot market construction, day-ahead, intraday, and real-time market clearing technologies have been piloted in a number of pilot units across the country for long-cycle settlement trials, basically meeting the actual operational requirements of provincial-level electricity spot markets. However, whether it's power generation plan preparation under the three-level (open, fair, and transparent) dispatch model or optimized clearing under the electricity spot market model, the shortest execution cycle is 5 minutes, and the fastest calculation process is 3 minutes, which cannot cope with the rapid decision-making required for resource regulation in an environment where new energy sources are the main power generation source.

[0005] Those skilled in the art urgently need to address the risks to grid safety caused by the inability of existing power generation plans and market clearing to cope with intermittent energy and real-time fluctuations in electricity demand. Summary of the Invention

[0006] Objective: In order to overcome the shortcomings of the existing technology, the present invention provides a safety correction auxiliary decision-making method and device based on the balance adjustment of a specific unit group, providing a fast and effective auxiliary decision-making means for the safe and stable operation of the new power system.

[0007] Technical solution: To solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0008] Firstly, a safety correction auxiliary decision-making method based on the balance adjustment of a specific unit group includes the following steps:

[0009] Obtain basic data for safety correction and decision support.

[0010] Based on the basic data, eliminate equipment exceeding limits and obtain the unit output adjustment amount.

[0011] After the equipment exceeds the limit and the problem is successfully eliminated, the computer group adjusts the demand based on the unit output adjustment.

[0012] Adjust the output balance of the units within the unit group according to the adjustment demand of the unit group.

[0013] After successful adjustment, the adjusted unit output of the unit group will be entered into the database and sent to AGC for tracking and execution.

[0014] As a preferred embodiment, the basic data for safety calibration includes: calculation parameters, data on out-of-limit equipment, unit data, unit group data, and sensitivity data.

[0015] As a preferred embodiment, the calculation parameters include: planned time to eliminate over-limits and equipment to eliminate over-limits; the over-limit equipment data includes over-limit equipment, equipment limits, and actual power flow of the equipment; the unit data includes basic unit information, unit calculation parameters, current actual unit output, unit output limit, unit ramp rate, and unit adjustable status; the unit group data includes unit group and unit group composition information; and the sensitivity data includes the power transfer distribution factor of the unit to the power flow of the line, transformer, or section.

[0016] As a preferred solution, the elimination of equipment exceeding limits is performed based on basic data, including the following steps:

[0017] 2-1. Calculate the amount of equipment flow adjustment that needs to be eliminated from exceeding the limit based on the equipment flow and equipment quota.

[0018] 2-2. Based on the unit's current actual output and the unit's ramp rate and slippage rate, the computer group eliminates the output adjustment range at the time point when the equipment exceeds the limit. The intersection of the unit's output adjustment range, the unit's output obstruction range, and the unit's inherent maximum and minimum technical output range is then used to obtain the unit's final output adjustment range at the time point when the equipment exceeds the limit.

[0019] 2-3. Set the unit's sensitivity to the equipment as the allocation weight of the unit's output adjustment amount, add the weights of all participating units to obtain the total system weight, and divide the allocation weight of the unit's output adjustment amount by the system weight to obtain the unit's output adjustment ratio.

[0020] 2-4. Multiply the power flow adjustment amount of the equipment by the power output adjustment ratio of the participating units to obtain the power output adjustment amount of the unit. The sign of the power output adjustment amount of the unit is determined by the direction of the power flow adjustment and the sign of the sensitivity of the unit to the equipment.

[0021] 2-5. After obtaining the unit output adjustment amount, determine whether the adjusted output of each unit falls within the output adjustment range, and correct the output of units that exceed the limit. If the unit's adjusted output is greater than the right endpoint of the output adjustment range, the unit's output is reset to the right endpoint of the output adjustment range, and the unit is marked as no longer participating in the next round of output allocation. The unit's downward adjustment amount is added to the remaining adjustment amount of the equipment power flow for the next round of adjustment. If the unit's adjusted output is less than the left endpoint of the output adjustment range, the unit's adjusted output is set to the left endpoint of the output adjustment range, and the unit is marked as no longer participating in the next round of adjustment. The unit's upward adjustment amount is added to the remaining adjustment amount of the equipment power flow for the next round of adjustment.

[0022] 2-6. If the absolute value of the remaining power flow adjustment of the equipment is less than the first threshold, the equipment over-limit is eliminated, and proceed to 2-10. If the absolute value of the remaining power flow adjustment of the equipment is greater than the first threshold, calculate the number of adjustable units in the next round. If the number of adjustable units is greater than zero, proceed to 2-7; otherwise, proceed to 2-8.

[0023] 2-7. Multiply the remaining power flow adjustment amount of the equipment by the unit output adjustment ratio of the participating units to obtain the unit adjustment amount. Add this to the unit output after the previous adjustment to obtain the new unit output adjustment amount. After all units have finished adjusting, add back 2-5 and 2-6.

[0024] 2-8. If the absolute value of the remaining adjustment amount of the equipment power flow is greater than the first threshold and there are no adjustable units, it indicates that there are still over-limits after all units are adjusted. Determine whether the equipment can tolerate over-limits. If it can tolerate over-limits and the over-limit amount is less than the tolerance, proceed to 2-10. Otherwise, proceed to step 2-9.

[0025] 2-9. If the power flow limit of the equipment is not completely eliminated and there are no units available for allocation, the equipment power flow allocation will fail.

[0026] 2-10. The equipment power flow exceeding the limit has been successfully eliminated.

[0027] As a preferred embodiment, the first threshold is set to 0.01MW.

[0028] As a preferred option, the calculation method for the unit group adjustment demand includes:

[0029] The output adjustment of the system is statistically calculated based on the unit output adjustment. The system output adjustment is reversed, which is the demand for unit output adjustment within the unit group.

[0030] As a preferred option, the power output balance adjustment of the units within the unit group includes the following steps:

[0031] 4-1. Based on the unit composition information within the unit group and the unit's sensitivity information to the cross-section, select the units that will participate in the power balance adjustment. If the unit's sensitivity to equipment exceeding the limit is greater than the second threshold, it will not participate in the power balance adjustment.

[0032] 4-2. Based on the current actual output of each generating unit participating in the power balance adjustment, as well as the unit's ramp-up rate and run-down rate, calculate the unit's output adjustment range. Then, take the intersection of the unit's output adjustment range, the unit's obstructed output range, and the unit's inherent maximum and minimum technical output to obtain the unit's output adjustment range participating in the power balance adjustment.

[0033] 4-3. Take the reciprocal of the number of generating units participating in the power generation and consumption balance adjustment, which is the unit output adjustment ratio.

[0034] 4-4. Multiply the required output adjustment of the units within the unit group by the unit output adjustment ratio of the adjustable units to obtain the unit output adjustment amount.

[0035] 4-5. After obtaining the unit output adjustment amount, determine whether the adjusted output of each unit falls within the unit output adjustment range participating in the power balance adjustment. If the adjusted output of the unit is greater than the right end of the output adjustment range, the unit output is reset to the right end of the output adjustment range, and the unit is marked as no longer participating in the next round of output allocation. The unit's downward adjustment amount is added to the remaining amount of the unit group adjustment demand for the next round of adjustment. If the adjusted output of the unit is less than the left end of the output adjustment range, the unit's adjusted output is set to the left end of the output adjustment range, and the unit is marked as no longer participating in the next round of adjustment. The unit's upward adjustment amount is added to the remaining amount of the unit group adjustment demand for the next round of adjustment.

[0036] 4-6. If the absolute value of the remaining adjustment demand of the unit group is less than the third threshold, the adjustment demand of the unit group is completed, and proceed to 4-10. If the absolute value of the remaining adjustment demand of the unit group is greater than the third threshold, calculate the number of adjustable units in the next round. If the number of adjustable units is greater than zero, proceed to 4-7; otherwise, proceed to 4-8.

[0037] 4-7. Multiply the remaining amount of the unit group adjustment by the output adjustment ratio of the units participating in the power generation and consumption balance adjustment to obtain the unit adjustment amount. Add this to the output of the unit after the previous round of adjustment to obtain the new unit output adjustment amount. After all units have been adjusted, return to 4-5 and 4-6.

[0038] 4-8. If the absolute value of the remaining demand for unit group adjustment is greater than the third threshold and there are no units that can be adjusted, it indicates that even after all units are adjusted, it is still impossible to achieve a balance between power generation and consumption. Determine whether to tolerate the imbalance between power generation and consumption. If the imbalance is tolerated and the amount of imbalance is less than the tolerance level, proceed to 4-10; otherwise, proceed to 4-9.

[0039] 4-9. Power generation and consumption are unbalanced, and there are no generating units available for allocation, resulting in failure to adjust the allocation of generating unit groups to meet demand.

[0040] 4-10. The demand allocation for the unit group adjustment was successful, meeting the power generation and consumption balance requirements.

[0041] As a preferred embodiment, the second threshold is set to 0.01MW and the third threshold is set to 0.01MW.

[0042] As a preferred option, the adjusted unit output is asynchronously written into the real-time library and the commercial library.

[0043] Secondly, a safety correction auxiliary decision-making device based on the balance adjustment of a specific unit group includes the following modules:

[0044] Basic data acquisition module: Used to acquire basic data for safety correction auxiliary decision-making.

[0045] Equipment exceeding limit elimination module: Used to eliminate equipment exceeding limits based on basic data and obtain the unit output adjustment amount.

[0046] Unit Group Adjustment Demand Calculation Module: After successful elimination of equipment exceeding limits, the module calculates the group adjustment demand based on the unit output adjustment.

[0047] Unit output balance adjustment module: used to adjust the output balance of units within a unit group according to the adjustment requirements of the unit group.

[0048] Unit output execution module: After successful adjustment, the adjusted unit output of the unit group is entered into the database and sent to AGC for tracking and execution.

[0049] Beneficial Effects: The safety correction auxiliary decision-making method and device based on the balance adjustment of a specific unit group provided by this invention, in order to adapt to the rapid decision-making needs under the uncertain scenarios of future new power systems, divides the units into units with over-limit equipment adjustment and units with power generation and consumption balance adjustment by specifying the balance system deviation of a specific unit group. The method adopts the approach of adjusting the output of units with over-limit equipment first and adjusting the output of units with power generation and consumption balance later, so as to realize rapid decision-making on unit output adjustment in emergency situations and provide an auxiliary decision-making method for rapid adjustment of unit output plans under the uncertain scenarios of future new power systems. Attached Figure Description

[0050] Figure 1 A flowchart for safety correction auxiliary decision-making based on the balance adjustment of a specific unit group.

[0051] Figure 2 Flowchart for eliminating equipment exceeding limits and adjusting unit output.

[0052] Figure 3 A flowchart for adjusting the output balance of units within a unit group. Detailed Implementation

[0053] The present invention will be further described below with reference to specific embodiments.

[0054] like Figure 1 As shown, a safety correction auxiliary decision-making method based on the balance adjustment of a specific unit group includes the following steps:

[0055] Step S1: Obtain basic data for safety correction auxiliary decision-making.

[0056] Step S2: Eliminate equipment exceeding limits based on basic data and obtain the unit output adjustment amount. If the equipment exceeding limits is successfully eliminated, proceed to step S3; otherwise, proceed to step S6.

[0057] Step S3: Adjust the demand based on the unit output adjustment amount using the computer group.

[0058] Step S4: Adjust the output balance of the units within the unit group according to the adjustment demand of the unit group. If the adjustment is successful, proceed to step S5; otherwise, proceed to step S6.

[0059] Step S5: Input the adjusted unit output of the unit group into the database and send it to AGC for tracking and execution.

[0060] Step S6, adjustment complete.

[0061] Furthermore, the basic data for safety calibration mentioned in step S1 includes: calculation parameters, data on out-of-limit equipment, unit data, unit group data, and sensitivity data.

[0062] Furthermore, the calculation parameters include: planned time to eliminate over-limits and equipment to eliminate over-limits; the over-limit equipment data includes over-limit equipment, equipment limits, and actual power flow of the equipment; the unit data includes basic unit information, unit calculation parameters, current actual unit output, unit output limit, unit ramp rate, and unit adjustable status; the unit group data includes unit group and unit group composition information; the sensitivity data includes the power generation transfer distribution factor of the unit to the power flow of equipment (lines, transformers, or sections).

[0063] Sensitivity data is obtained by acquiring the latest power grid physical model and real-time operation data, and is calculated using the PQ decoupling method.

[0064] Furthermore, such as Figure 2 As shown, step S2 involves eliminating equipment exceeding limits based on basic data, including the following steps:

[0065] 2-1. Calculate the amount of equipment flow adjustment that needs to be eliminated from exceeding the limit based on the equipment flow and equipment quota.

[0066] 2-2. Calculate the output adjustment range for each participating unit at the time point for eliminating equipment over-limits. Based on the unit's current actual output and its ramp-up and ramp-down rates, calculate the output adjustment range for the unit at the time point for eliminating equipment over-limits. Then, take the intersection of the unit's output adjustment range, the unit's output obstruction range, and the unit's inherent maximum and minimum technical output range to obtain the final output adjustment range for the unit at the time point for eliminating equipment over-limits.

[0067] 2-3. Unit Output Adjustment Ratio. The unit's sensitivity to the equipment is set as the allocation weight of the unit's output adjustment amount. The weights of all participating units are added together to obtain the total system weight. The allocation weight of the unit's output adjustment amount is divided by the system weight to obtain the unit's output adjustment ratio.

[0068] 2-4. Calculate the unit output adjustment amount based on the unit output adjustment ratio. Multiply the equipment power flow adjustment amount by the unit output adjustment ratio of the participating units to obtain the unit output adjustment amount. The sign of the unit output adjustment amount is determined by the direction of equipment power flow adjustment and the sign of the unit's sensitivity to the equipment.

[0069] 2-5. Unit Output Correction. After obtaining the unit output adjustment amount, determine whether the adjusted output of each unit falls within the output adjustment range, and correct the output of units that exceed the limit. If the adjusted output of a unit is greater than the right endpoint of the output adjustment range, the unit output is reset to the right endpoint of the output adjustment range, and this unit is marked as no longer participating in the next round of output allocation. Since the adjusted output of this unit is reduced, the downward adjustment amount needs to be borne by other units' upward adjustment. Therefore, the downward adjustment amount of the unit is added to the remaining adjustment amount of the equipment power flow for the next round of adjustment. If the adjusted output of a unit is less than the left endpoint of the output adjustment range, the adjusted output of the unit is set to the left endpoint of the output adjustment range, and the unit is marked as no longer participating in the next round of adjustment. Since the adjusted output of the unit is increased, the upward adjustment amount should be borne by other units' downward adjustment. The upward adjustment amount of the unit is added to the remaining adjustment amount of the equipment power flow for the next round of adjustment.

[0070] 2-6. If the absolute value of the remaining power flow adjustment of the equipment is less than 0.01MW, the equipment over-limit has been eliminated, proceed to 2-10; if the absolute value of the remaining power flow adjustment of the equipment is greater than 0.01MW, calculate the number of adjustable units in the next round. If the number of adjustable units is greater than zero, proceed to 2-7; otherwise, proceed to 2-8.

[0071] 2-7. Multiply the remaining power flow adjustment amount of the equipment by the unit output adjustment ratio of the participating units to obtain the unit adjustment amount. Add this to the unit output after the previous adjustment to obtain the new unit output. After all units have finished adjusting, add back 2-5 and 2-6.

[0072] 2-8. If the remaining power flow adjustment of the equipment is greater than 0.01MW and there are no adjustable units, it indicates that there are still over-limits after all units are adjusted. Determine whether the equipment can tolerate over-limits. If it can tolerate over-limits and the over-limit is less than the tolerance, proceed to 2-10. Otherwise, proceed to step 2-9.

[0073] 2-9. If the power flow limit of the equipment is not completely eliminated and there are no units available for allocation, the equipment power flow allocation will fail.

[0074] 2-10. The equipment power flow exceeding the limit has been successfully eliminated.

[0075] Furthermore, in step S3, the calculation of the unit group adjustment demand is based on the statistical system output adjustment of the unit output adjustment, which is the power generation and consumption imbalance. It is necessary to adjust the output of the units within the unit group in the opposite direction so that the absolute value of the unit output adjustment of the unit group is the same as that of the system output adjustment, but the signs are opposite, to ensure the power generation and consumption balance of the system. Therefore, the system output adjustment takes the opposite sign, which is the demand for unit output adjustment within the unit group, and is called the unit group adjustment demand.

[0076] Furthermore, such as Figure 3 As shown, step S4, the power output balance adjustment of the unit group, includes the following steps:

[0077] 4-1. Based on the unit composition information within the unit group and the unit's sensitivity information to the cross-section, select the units that will participate in the power balance adjustment. If the unit's sensitivity to equipment exceeding the limit is greater than 0.01MW, it will not participate in the power balance adjustment.

[0078] 4-2. Calculate the power output adjustment range for each generating unit participating in the power balance adjustment. Based on the current actual output of the unit and its ramp-up and ramp-down rates, calculate the power output adjustment range of the unit. Then, take the intersection of the unit's power output adjustment range, the unit's obstructed power output range, and the unit's inherent maximum and minimum technical output to obtain the power output adjustment range of the unit participating in the power balance adjustment.

[0079] 4-3. Calculate the output adjustment ratio of the units participating in the power generation and consumption balance adjustment. Since an average distribution method is adopted, the reciprocal of the number of adjustable units is the unit output adjustment ratio.

[0080] 4-4. Calculate the output adjustment amount of the generating units participating in the power generation and consumption balance adjustment. Multiply the adjustment demand of the generating unit group by the unit output adjustment ratio of the adjustable units to obtain the unit output adjustment amount.

[0081] 4-5. Unit Output Correction. After obtaining the unit output adjustment amount, determine whether the adjusted output of each unit falls within the unit output adjustment range participating in the power balance adjustment, and correct the output of units exceeding the limit. If the unit's adjusted output is greater than the right end of the output adjustment range, the unit's output is reset to the right end of the output adjustment range, and this unit is marked as no longer participating in the next round of output allocation. Since the unit's adjusted output is lower, the lower adjustment amount needs to be borne by other units' upward adjustment. Therefore, the unit's downward adjustment amount is added to the remaining amount of the unit group's adjustment demand for the next round of adjustment. If the unit's adjusted output is less than the left end of the output adjustment range, the unit's adjusted output is set to the left end of the output adjustment range, and the unit is marked as no longer participating in the next round of adjustment. Since the unit's adjusted output is higher, the higher adjustment amount should be borne by other units' downward adjustment. The unit's upward adjustment amount is added to the remaining amount of the unit group's adjustment demand for the next round of adjustment.

[0082] 4-6. If the absolute value of the remaining adjustment demand of the unit group is less than 0.01MW, the adjustment demand of the unit group is completed, and proceed to 4-10. If the absolute value of the remaining adjustment demand of the unit group is greater than 0.01MW, calculate the number of adjustable units in the next round. If the number of adjustable units is greater than zero, proceed to 4-7; otherwise, proceed to 4-8.

[0083] 4-7. Multiply the remaining amount of the unit group adjustment by the output adjustment ratio of the units participating in the power balance adjustment to obtain the unit adjustment amount. Add this to the output of the unit after the previous adjustment to obtain the new unit output. After all units have been adjusted, return to 4-5 and 4-6.

[0084] 4-8. If the remaining capacity of the unit group adjustment is greater than 0.01MW and there are no units that can be adjusted, it indicates that the power generation and consumption balance cannot be achieved even after all units are adjusted. Determine whether to tolerate the power generation and consumption imbalance. If the imbalance is tolerated and the imbalance is less than the tolerance level, proceed to 4-10; otherwise, proceed to 4-9.

[0085] 4-9. Power generation and consumption are unbalanced, and there are no generating units available for allocation, resulting in failure to adjust the allocation of generating unit groups to meet demand.

[0086] 4-10. The demand allocation for the unit group adjustment was successful, meeting the power generation and consumption balance requirements.

[0087] Furthermore, after step S5, the unit output is asynchronously written into the real-time library and the commercial library, and simultaneously sent to AGC for tracking and execution.

[0088] Example 2:

[0089] A safety correction auxiliary decision-making device based on the balance adjustment of a specific unit group includes the following modules:

[0090] Basic data acquisition module: Used to acquire basic data for safety correction auxiliary decision-making.

[0091] Equipment exceeding limit elimination module: Used to eliminate equipment exceeding limits based on basic data and obtain the unit output adjustment amount.

[0092] Unit Group Adjustment Demand Calculation Module: After successful elimination of equipment exceeding limits, the module calculates the group adjustment demand based on the unit output adjustment.

[0093] Unit output balance adjustment module: used to adjust the output balance of units within a unit group according to the adjustment requirements of the unit group.

[0094] Unit output execution module: After successful adjustment, the adjusted unit output of the unit group is entered into the database and sent to AGC for tracking and execution.

[0095] The method of this invention is applicable to the rapid adjustment of unit output in the event of over-limit conditions of dispatching equipment at the national, provincial, and municipal levels. It features high computational efficiency and strong adaptability. The technical solution of this invention has been applied in provincial power grids, and the application effect meets expectations.

[0096] 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.

[0097] 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.

[0098] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0099] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0100] 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 principle 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 safety correction auxiliary decision-making method based on the balance adjustment of a specific unit group, characterized in that: Includes the following steps: Obtain basic data for safety correction and decision support; Based on the basic data, eliminate equipment exceeding limits and obtain the unit output adjustment amount; After the equipment exceeds the limit and the limit is successfully eliminated, the computer group adjusts the demand based on the unit output adjustment amount. Adjust the output balance of the units within the unit group according to the adjustment demand of the unit group; After the adjustment is successful, the adjusted unit output of the unit group will be entered into the database and sent to AGC for tracking and execution. Eliminating equipment exceeding limits based on basic data includes the following steps: 2-1. Calculate the amount of equipment flow adjustment that needs to be eliminated to eliminate over-limit equipment based on equipment flow and equipment limits; 2-2. Based on the unit's current actual output and the unit's ramp rate and slip rate, the computer group eliminates the output adjustment range at the time point when the equipment exceeds the limit. The intersection of the unit's output adjustment range, the unit's output obstruction range, and the unit's inherent maximum and minimum technical output range is then used to obtain the unit's final output adjustment range at the time point when the equipment exceeds the limit. 2-3. Set the unit's sensitivity to the equipment as the allocation weight of the unit's output adjustment amount, add the weights of all participating units to obtain the total system weight, and divide the allocation weight of the unit's output adjustment amount by the system weight to obtain the unit's output adjustment ratio. 2-4. Multiply the equipment power flow adjustment amount by the unit output adjustment ratio of the participating units to obtain the unit output adjustment amount. The positive or negative value of the unit output adjustment amount is determined by the direction of equipment power flow adjustment and the positive or negative value of the unit's sensitivity to the equipment. 2-5. After obtaining the unit output adjustment amount, determine whether the adjusted output of each unit falls within the output adjustment range, and correct the output of units that exceed the limit; if the unit's adjusted output is greater than the right end of the output adjustment range, the unit's output is reset to the right end of the output adjustment range, and the unit is marked as no longer participating in the next round of output allocation. The unit's downward adjustment amount is added to the remaining adjustment amount of the equipment power flow for the next round of adjustment; if the unit's adjusted output is less than the left end of the output adjustment range, the unit's adjusted output is set to the left end of the output adjustment range, and the unit is marked as no longer participating in the next round of adjustment. The unit's upward adjustment amount is added to the remaining adjustment amount of the equipment power flow for the next round of adjustment. 2-6. If the absolute value of the remaining power flow adjustment of the equipment is less than the first threshold, the equipment over-limit is eliminated, and proceed to 2-10; if the absolute value of the remaining power flow adjustment of the equipment is greater than the first threshold, calculate the number of adjustable units in the next round. If the number of adjustable units is greater than zero, proceed to 2-7; otherwise, proceed to 2-8. 2-7. Multiply the remaining power flow adjustment amount of the equipment by the unit output adjustment ratio of the participating units to obtain the unit adjustment amount. Add this to the unit output after the previous round of adjustment to obtain the new unit output adjustment amount. After all units have been adjusted, add back 2-5 and 2-6. 2-8. If the absolute value of the remaining adjustment amount of the equipment power flow is greater than the first threshold and there are no adjustable units, it indicates that there are still over-limits after all units are adjusted. Determine whether the equipment can tolerate over-limits. If it can tolerate over-limits and the over-limit amount is less than the tolerance, proceed to 2-10. Otherwise, proceed to step 2-9. 2-9. The power flow limit of the equipment has not been completely eliminated and there are no units available for allocation, so the equipment power flow allocation fails. 2-10. The equipment power flow exceeding the limit has been successfully eliminated.

2. The safety correction auxiliary decision-making method based on the balance adjustment of a specific unit group according to claim 1, characterized in that: The safety correction auxiliary decision-making basis data includes: calculation parameters, out-of-limit equipment data, unit data, unit group data, and sensitivity data.

3. The safety correction auxiliary decision-making method based on the balance adjustment of a specific unit group according to claim 2, characterized in that: The calculation parameters include: planned time to eliminate over-limits and equipment to eliminate over-limits; the over-limit equipment data includes over-limit equipment, equipment limits, and actual power flow of the equipment; the unit data includes basic unit information, unit calculation parameters, current actual unit output, unit output limit, unit ramp rate, and unit adjustable status; the unit group data includes unit group and unit group composition information; the sensitivity data includes the power transfer distribution factor of the unit to the power flow of the line, transformer, or section.

4. The safety correction auxiliary decision-making method based on the balance adjustment of a specific unit group according to claim 1, characterized in that: The first threshold is set to 0.01MW.

5. The safety correction auxiliary decision-making method based on the balance adjustment of a specific unit group according to claim 1, characterized in that: The calculation methods for unit group adjustment requirements include: The output adjustment of the system is statistically calculated based on the unit output adjustment. The system output adjustment is reversed, which is the demand for unit output adjustment within the unit group.

6. The safety correction auxiliary decision-making method based on the balance adjustment of a specific unit group according to claim 1, characterized in that: Adjusting the output balance of units within a unit group includes the following steps: 4-1. Based on the unit composition information within the unit group and the unit's sensitivity information to the cross-section, select the units that will participate in the power balance adjustment. If the unit's sensitivity to equipment exceeding the limit is greater than the second threshold, it will not participate in the power balance adjustment. 4-2. Based on the current actual output of each generating unit participating in the power balance adjustment, as well as the unit's ramp-up rate and run-down rate, calculate the unit's output adjustment range. Then, take the intersection of the unit's output adjustment range, the unit's obstructed output range, and the unit's inherent maximum and minimum technical output to obtain the unit's output adjustment range participating in the power balance adjustment. 4-3. Take the reciprocal of the number of generating units participating in the power balance adjustment, which is the unit output adjustment ratio; 4-4. Multiply the required output adjustment of the units within the unit group by the unit output adjustment ratio of the adjustable units to obtain the unit output adjustment amount; 4-5. After obtaining the unit output adjustment amount, determine whether the adjusted output of each unit falls within the unit output adjustment range participating in the power balance adjustment. If the adjusted output of the unit is greater than the right end of the output adjustment range, the unit output is reset to the right end of the output adjustment range, and the unit is marked as no longer participating in the next round of output allocation. The unit's downward adjustment amount is added to the remaining amount of the unit group adjustment demand for the next round of adjustment. If the adjusted output of the unit is less than the left end of the output adjustment range, the unit's adjusted output is set to the left end of the output adjustment range, and the unit is marked as no longer participating in the next round of adjustment. The unit's upward adjustment amount is added to the remaining amount of the unit group adjustment demand for the next round of adjustment. 4-6. If the absolute value of the remaining amount of unit group adjustment demand is less than the third threshold, the unit group adjustment demand is completed, and proceed to 4-10; if the absolute value of the remaining amount of unit group adjustment is greater than the third threshold, calculate the number of adjustable units in the next round. If the number of adjustable units is greater than zero, proceed to 4-7; otherwise, proceed to 4-8. 4-7. Multiply the remaining amount of the unit group adjustment by the output adjustment ratio of the units participating in the power generation and consumption balance adjustment to obtain the unit adjustment amount. Add this to the output of the unit after the previous round of adjustment to obtain the new unit output adjustment amount. After all units have been adjusted, return to 4-5 and 4-6. 4-8. If the absolute value of the remaining demand for unit group adjustment is greater than the third threshold and there are no units that can be adjusted, it indicates that even after all units are adjusted, it is still impossible to achieve a balance between power generation and consumption. Determine whether to tolerate the imbalance between power generation and consumption. If the imbalance is tolerated and the amount of imbalance is less than the tolerance level, proceed to 4-10; otherwise, proceed to 4-9. 4-9. Power generation and consumption are unbalanced, and there are no generating units available for allocation, resulting in failure to adjust the allocation of generating unit group demand. 4-10. The demand allocation for the unit group adjustment was successful, meeting the power generation and consumption balance requirements.

7. The safety correction auxiliary decision-making method based on the balance adjustment of a specific unit group according to claim 6, characterized in that: The second threshold is set to 0.01MW, and the third threshold is set to 0.01MW.

8. The safety correction auxiliary decision-making method based on the balance adjustment of a specific unit group according to claim 1, characterized in that: The adjusted unit output is asynchronously written into the real-time library and the commercial library.

9. A safety correction auxiliary decision-making device based on the balance adjustment of a specific unit group, characterized in that: Includes the following modules: Basic data acquisition module: used to acquire basic data for safety correction auxiliary decision-making; Equipment exceeding limit elimination module: Used to eliminate equipment exceeding limits based on basic data and obtain the unit output adjustment amount; Unit Group Adjustment Demand Calculation Module: After successful elimination of equipment exceeding limits, the module calculates the group adjustment demand based on the unit output adjustment. Unit output balance adjustment module: used to adjust the output balance of units within a unit group according to the adjustment requirements of the unit group; Unit output execution module: After successful adjustment, the adjusted unit output of the unit group is entered into the database and sent to AGC for tracking and execution. Eliminating equipment exceeding limits based on basic data includes the following steps: 2-1. Calculate the amount of equipment flow adjustment that needs to be eliminated to eliminate over-limit equipment based on equipment flow and equipment limits; 2-2. Based on the unit's current actual output and the unit's ramp rate and slip rate, the computer group eliminates the output adjustment range at the time point when the equipment exceeds the limit. The intersection of the unit's output adjustment range, the unit's output obstruction range, and the unit's inherent maximum and minimum technical output range is then used to obtain the unit's final output adjustment range at the time point when the equipment exceeds the limit. 2-3. Set the unit's sensitivity to the equipment as the allocation weight of the unit's output adjustment amount, add the weights of all participating units to obtain the total system weight, and divide the allocation weight of the unit's output adjustment amount by the system weight to obtain the unit's output adjustment ratio. 2-4. Multiply the equipment power flow adjustment amount by the unit output adjustment ratio of the participating units to obtain the unit output adjustment amount. The positive or negative value of the unit output adjustment amount is determined by the direction of equipment power flow adjustment and the positive or negative value of the unit's sensitivity to the equipment. 2-5. After obtaining the unit output adjustment amount, determine whether the adjusted output of each unit falls within the output adjustment range, and correct the output of units that exceed the limit; if the unit's adjusted output is greater than the right end of the output adjustment range, the unit's output is reset to the right end of the output adjustment range, and the unit is marked as no longer participating in the next round of output allocation. The unit's downward adjustment amount is added to the remaining adjustment amount of the equipment power flow for the next round of adjustment; if the unit's adjusted output is less than the left end of the output adjustment range, the unit's adjusted output is set to the left end of the output adjustment range, and the unit is marked as no longer participating in the next round of adjustment. The unit's upward adjustment amount is added to the remaining adjustment amount of the equipment power flow for the next round of adjustment. 2-6. If the absolute value of the remaining power flow adjustment of the equipment is less than the first threshold, the equipment over-limit is eliminated, and proceed to 2-10; if the absolute value of the remaining power flow adjustment of the equipment is greater than the first threshold, calculate the number of adjustable units in the next round. If the number of adjustable units is greater than zero, proceed to 2-7; otherwise, proceed to 2-8. 2-7. Multiply the remaining power flow adjustment amount of the equipment by the unit output adjustment ratio of the participating units to obtain the unit adjustment amount. Add this to the unit output after the previous round of adjustment to obtain the new unit output adjustment amount. After all units have been adjusted, add back 2-5 and 2-6. 2-8. If the absolute value of the remaining adjustment amount of the equipment power flow is greater than the first threshold and there are no adjustable units, it indicates that there are still over-limits after all units are adjusted. Determine whether the equipment can tolerate over-limits. If it can tolerate over-limits and the over-limit amount is less than the tolerance, proceed to 2-10. Otherwise, proceed to step 2-9. 2-9. The power flow limit of the equipment has not been completely eliminated and there are no units available for allocation, so the equipment power flow allocation fails. 2-10. The equipment power flow exceeding the limit has been successfully eliminated.

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