Tap tap gear adjustment and bus voltage constraint optimization configuration method and system

Abstract

The invention discloses a tap gear adjustment and bus voltage constraint optimization configuration method and system. The method comprises the following steps: acquiring input data; calculating input data and performing trend analysis to obtain a voltage difference value, a gear adjusting direction, a gear adjusting quantity, a voltage estimated value after gear adjustment, an optimized voltage upper limit and lower limit, an optimized 110kV bus voltage upper limit and lower limit and an optimization result at each moment; outputting the optimized main shift gear configuration curve and the optimized bus voltage upper and lower limits; the method is beneficial to improving the action adjusting space of the main grid side equipment, improving the load change coping capacity of the main grid side, and guaranteeing the safe and stable operation of the power grid.

Description

Technical Field

[0001] This invention relates to configuration methods and systems, and more particularly to a method and system for optimizing the configuration of tap position adjustment and bus voltage constraints. Background Technology

[0002] With the accelerated construction of new power systems, the large-scale integration of low-voltage distributed generation into the grid has complicated grid voltage management due to the high volatility and intermittent nature of new energy sources. This is especially true during periods of high distributed generation, when grid voltage experiences bidirectional over-limit issues, with "low voltage at the main source and high voltage at the distribution source." This not only affects the stable operation of the grid but also increases the difficulty of voltage regulation.

[0003] Furthermore, the voltage regulation resources at all levels of the current main and distribution networks are underutilized, with main grid transformers operating at low speeds for extended periods. Even with limited downward adjustment space, the main grid's ability to cope with significant load fluctuations is insufficient. Faced with these challenges, existing voltage regulation methods are ill-suited to effectively address the dynamic voltage issues arising from the highly volatile characteristics of renewable energy sources. Summary of the Invention

[0004] Purpose of the invention: The purpose of this invention is to provide a method for optimizing the configuration of tap position adjustment and bus voltage constraint without affecting the overall voltage index and bus voltage limits. This method optimizes the configuration of the main transformer tap position and AVC voltage strategy, thereby increasing the adjustment action space of the main grid equipment, improving the main grid's ability to cope with load changes, and ensuring the safe and stable operation of the power grid. On the other hand, this invention also provides a system for optimizing the configuration of tap position adjustment and bus voltage constraint.

[0005] Technical solution: The tap position adjustment and bus voltage constraint optimization configuration method of the present invention includes:

[0006] Obtain historical bus voltage data and voltage optimization target values, and calculate the voltage difference;

[0007] The direction of gear adjustment is determined based on the voltage difference. The amount of gear adjustment is calculated based on the direction of gear adjustment, the gear adjustment step size of the on-load tap changer of the main transformer, the rated voltage of the low-voltage side of the main transformer, and the voltage difference.

[0008] Calculate the estimated voltage after each gear adjustment based on the gear adjustment amount and voltage margin value at each moment.

[0009] Calculate the upper and lower limits of the voltage optimization, perform trend analysis on the upper and lower limits of the voltage optimization at each moment, and obtain the optimized main transformer gear configuration curve, voltage upper limit and lower limit results;

[0010] Output the optimized result.

[0011] Preferably, it also includes calculating the tap adjustment amount of the 110kV station by referring to the tap adjustment amount of the main transformer of the 220kV station, comparing it with the tap adjustment amount of the main transformer of the 110kV station at that moment, correcting the tap adjustment amount parameter of the 110kV station, and calculating the set of upper and lower voltage optimization values ​​of the 110kV station bus based on the corrected tap adjustment amount.

[0012] When the upper limit of voltage optimization is greater than the upper limit of assessment, the upper limit of assessment shall be used for correction; when the lower limit of voltage optimization is less than the lower limit of assessment, the lower limit of assessment shall be used for correction.

[0013] Trend analysis is performed on the set of upper and lower voltage optimization values ​​at each moment. Based on the trend, the time period is divided into several time periods, and the optimized gear configuration, upper voltage limit, and lower voltage limit results are obtained respectively. Fitting processing is performed on the time periods with similar voltage limits to form the optimization results.

[0014] Preferably, for a 110kV substation, the impact of the tap adjustment of the upstream 220kV substation should be considered, and the tap adjustment amount G of the main transformer of the upstream 220kV substation should be calculated. 220 Afterwards, and the 110kV substation main transformer at that moment, G 110 Value comparison;

[0015] If G 110 >G 220 >0, then G 110 By G 220 Correction, if G 220 ≥G 110 If the value is greater than 0, then no correction is made. The formula is as follows:

[0016]

[0017] Among them, G 110 This indicates the main transformer's tap adjustment at that moment, G. 220 This indicates the adjustment range of the main transformer at the 220kV substation; with the corrected G... 110 Recalculate the upper and lower limits of the voltage optimization for the 110kV substation bus.

[0018] Preferably, the formula for calculating the voltage difference is:

[0019] Vd i =V i -Vt i ;

[0020] Among them, V i Vt represents the bus voltage at time i. i Vd represents the voltage optimization target value. i This represents the voltage difference at time i;

[0021] The formula for adjusting the gear direction is as follows:

[0022]

[0023] Where D represents the gear adjustment direction, 1 is to shift up, and 0 is to keep the original gear;

[0024] The formula for calculating the gear adjustment amount is as follows:

[0025]

[0026] Where T represents the tap changer adjustment step size of the on-load tap changer of the main transformer, and V nom This indicates the rated voltage on the low-voltage side of the main transformer, and G indicates the range of adjustment.

[0027] The formula for calculating the voltage estimate after the range adjustment is as follows:

[0028] V es =V i +C×T×V nom +V mg ;

[0029] Among them, V es This indicates the estimated voltage after adjustment, V. i Let V be the bus voltage at time i. mg This represents the voltage margin value, which is a settable parameter.

[0030] Preferably, the formula for the set of upper and lower limits for voltage optimization is as follows:

[0031]

[0032] Where N represents the set of times, V opup,i V represents the optimized upper limit of voltage at time i. opdn,i This represents the optimized lower voltage limit at time i;

[0033] Since the default setting only adjusts the voltage level upwards, the optimized lower voltage limit value V opdn Keep the original value V dn The optimized upper limit of voltage V opup As shown in the following formula:

[0034]

[0035] Among them, V opup This represents the optimized upper limit of voltage, V. es This indicates the estimated voltage after adjustment, V. opdn This represents the optimized lower voltage limit, V. dn G represents the original lower limit value, and G represents the gear adjustment amount.

[0036] Preferably, the optimized main transformer gear configuration curve is given in units of 288 points per day, providing the optimized main transformer gear at each moment; the optimized bus voltage upper and lower limits are divided into several time periods each day, providing the start time, end time, upper voltage limit, and lower voltage limit for each time period as the criteria for AVC control.

[0037] The tap position adjustment and bus voltage constraint optimization configuration system of the present invention includes:

[0038] The data acquisition module is used to acquire input data, including historical data of bus voltage, historical data of bus AVC control parameters, voltage optimization target value, historical data of main transformer tap position, rated voltage of the low voltage side of the main transformer, tap position adjustment step of the main transformer on-load tap changer, and the topological relationship between the bus and the main transformer of the upstream 220kV substation.

[0039] The analysis and calculation module is used to perform calculations and trend analysis on the input data to obtain the voltage difference, adjustment direction, gear adjustment amount, voltage estimate after gear adjustment, upper and lower limits of optimized voltage, upper and lower limits of 110kV bus voltage optimization, and optimization results at each time point.

[0040] The strategy output module is used to output the optimized main transformer gear configuration curve and the optimized upper and lower limits of the bus voltage.

[0041] Preferably, in the data acquisition module, the voltage optimization target value is obtained by the median of the voltage range; and the rated voltage of the low-voltage side of the main transformer and the adjustment step size of the on-load tap changer of the main transformer are obtained according to the parameters on the nameplate of the main transformer.

[0042] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: By using historical data of bus voltage, AVC operating parameters and network topology, calculations and trend analysis are performed to obtain the tap adjustment amount of the power grid at various times and the optimized upper and lower voltage limits, etc., thereby optimizing the main transformer tap configuration, which is conducive to improving the adjustment action space of the main grid side equipment, improving the main grid side's ability to cope with load changes, and ensuring the safe and stable operation of the power grid. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the process of the present invention. Detailed Implementation

[0044] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0045] The method for optimizing tap position adjustment and bus voltage constraint configuration includes the following steps:

[0046] S1. Acquire input data, including historical bus voltage values, historical bus AVC control parameters, voltage optimization target values, historical transformer tap positions, rated voltage on the low-voltage side of the main transformer, tap adjustment step size of the on-load tap changer of the main transformer, and the topological relationship between the bus and the main transformer of the upstream 220kV substation. Specifically, this includes:

[0047] Historical data of bus voltage, bus AVC control parameters, and main transformer tap position are acquired with a sampling period of 5 minutes; the voltage optimization target value is determined based on the median value of the voltage range; and the rated voltage of the low-voltage side of the main transformer and the tap position adjustment step of the main transformer on-load tap changer are obtained based on the parameters on the main transformer nameplate.

[0048] S2. Calculate the input data and perform trend analysis. The specific steps are as follows:

[0049] S21. Calculate the voltage difference, specifically the bus voltage V at time i. i and voltage optimization target value Vt i The voltage difference Vd at time i is calculated. i :

[0050] Vd i =V i -Vt i ;

[0051] Among them, V i Let Vt be the bus voltage at time i. i The target value for voltage optimization at time i is Vd. i Let be the voltage difference at time i;

[0052] S22. Calculate the gear shift direction based on the voltage difference Vd. i Determine the gear adjustment direction, when Vd i When the voltage is >0 (current voltage is higher than the target value), downgrading is not considered:

[0053]

[0054] Where D represents the gear adjustment direction, 1 is to shift up, and 0 is to keep the original gear;

[0055] S23. Calculate the gear adjustment amount based on the gear adjustment direction D, the on-load tap changer adjustment step size T of the main transformer, and the rated voltage V on the low-voltage side of the main transformer. nom Voltage difference Vd i The gear adjustment amount G is calculated as follows:

[0056]

[0057] Where T represents the tap changer adjustment step size of the on-load tap changer of the main transformer, and V nomThis indicates the rated voltage on the low-voltage side of the main transformer, and G indicates the range of adjustment.

[0058] S24. Calculate the estimated voltage after the gear adjustment, using the gear adjustment amount G and the bus voltage V. i Calculate the estimated voltage V after the adjustment. es :

[0059] V es =V i +G×T×V nom +V mg ;

[0060] Among them, V es This indicates the estimated voltage after adjustment, V. i Let V be the bus voltage at time i. mg This represents the voltage margin value, which is a settable parameter.

[0061] S25. Calculate the optimized upper voltage limit value. Since the default setting only adjusts upwards, the optimized lower voltage limit value is V. opdn Keep the original value V dn The optimized upper limit of voltage V opup As shown in the following formula:

[0062]

[0063] Among them, V opup This represents the optimized upper limit of voltage, V. es This indicates the estimated voltage after adjustment, V. opdn This represents the optimized lower voltage limit, V. dn G represents the original lower limit value, and G represents the gear adjustment amount.

[0064] S26. Calculate the upper and lower limits of voltage optimization. Perform the calculation for each time i to obtain the upper and lower limits of voltage optimization.

[0065]

[0066] Where N represents the set of times, V opup,i V represents the optimized upper limit of voltage at time i. opdn,i This represents the optimized lower voltage limit at time i;

[0067] S27. Calculate the upper and lower limits of voltage optimization for the 110kV substation busbar, referring to the main transformer tap adjustment value G of the 220kV substation. 220 The calculation method yields the G value of the 110kV substation main transformer at that moment. 110 Then, the two need to be compared;

[0068] If G 110 >G 220 >0, then G110 By G 220 Correction; if G 220 ≥G 110 If the value is greater than 0, then no correction is made. The formula is as follows:

[0069]

[0070] Among them, G 110 This indicates the main transformer's tap adjustment at that moment, G. 220 This indicates the adjustment range of the main transformer at the 220kV substation; with the corrected G... 110 Recalculate the upper and lower limits of the voltage optimization for the 110kV substation bus.

[0071] S28. Limit Correction: The final set of upper and lower voltage optimization limits should consider the upper and lower voltage assessment limits as constraints. When V opup,i When V exceeds the assessment limit, the adjustment is made based on the assessment limit value. opdn,i If the value is less than the lower limit of the assessment, it will be adjusted according to the lower limit of the assessment.

[0072] S29. Data trend analysis: Starting from time 0 and ending at 24, perform trend analysis on the set of upper and lower voltage optimization values ​​at each time point. Divide the data into several time periods based on the trend, and obtain the optimized gear configuration, upper voltage limit, and lower voltage limit results respectively. Fit the voltage limit similar time periods to form optimization results for no more than 9 time periods.

[0073] S3. Output the optimized main transformer gear configuration curve and the optimized upper and lower limits of the bus voltage. The optimized main transformer gear configuration curve is given in units of 288 points per day, providing the optimized main transformer gear at each moment; the optimized upper and lower limits of the bus voltage are divided into several time periods per day, providing the start time, end time, upper voltage limit, and lower voltage limit of each time period as the criteria for AVC control.

[0074] The tap position adjustment and bus voltage constraint optimization configuration system includes:

[0075] The data acquisition module is used to acquire input data, including historical data of bus voltage, historical data of bus AVC control parameters, voltage optimization target value, historical data of main transformer tap position, rated voltage of the low voltage side of the main transformer, tap position adjustment step of the main transformer on-load tap changer, and the topological relationship between the bus and the main transformer of the upstream 220kV substation.

[0076] The analysis and calculation module is used to perform calculations and trend analysis on the input data to obtain the voltage difference, adjustment direction, gear adjustment amount, voltage estimate after gear adjustment, upper and lower limits of optimized voltage, upper and lower limits of 110kV bus voltage optimization, and optimization results at each time point.

[0077] The strategy output module is used to output the optimized main transformer gear configuration curve and the optimized upper and lower limits of the bus voltage.

[0078] Specifically, the analysis and calculation module includes: calculating the voltage difference using the bus voltage and the voltage optimization target value; determining the tap adjustment direction using the voltage difference; calculating the tap adjustment amount using the tap adjustment direction, the tap adjustment step size of the on-load tap changer of the main transformer, the rated voltage on the low-voltage side of the main transformer, and the voltage difference; calculating the estimated voltage after tap adjustment using the tap adjustment amount and the bus voltage; calculating the upper and lower limit values ​​of the voltage optimization; calculating the tap adjustment amount of the 110kV substation by referring to the tap adjustment amount of the main transformer at the 220kV substation, and comparing it with the tap adjustment amount of the main transformer at the 110kV substation at that moment, and correcting it by 11. The tap position adjustment parameters of the 0kV station are used to calculate the voltage optimization upper and lower limit set of the 110kV station bus based on the corrected tap position adjustment parameters. When the voltage optimization upper limit is greater than the assessment upper limit, it is corrected by the assessment upper limit; when the voltage optimization lower limit is less than the assessment lower limit, it is corrected by the assessment lower limit. Trend analysis is performed on the voltage optimization upper and lower limit sets at each moment. Based on the trend, the time periods are divided into several time periods to obtain the optimized tap position configuration, voltage upper limit, and voltage lower limit results. Fitting processing is performed on the time periods with similar voltage limits to form optimization results for no more than 9 time periods.

[0079] Specifically, the strategy output module includes outputting the optimized main transformer gear configuration optimization curve in units of 288 points per day; dividing each day into several time periods based on the optimized upper and lower limits of the bus voltage, and outputting the start time, end time, upper voltage limit, and lower voltage limit of each time period as criteria for AVC control. Those skilled in the art will understand that the embodiments of this application can be provided as methods, systems, or computer program products.

[0080] 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 implemented 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. The solutions in the embodiments of this application can be implemented using various computer languages, such as the object-oriented programming language Java and the interpreted scripting language JavaScript.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0085] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A method for optimizing the configuration of tap position adjustment and bus voltage constraints, characterized in that, include: Obtain historical bus voltage data and voltage optimization target values, and calculate the voltage difference; The direction of gear adjustment is determined based on the voltage difference. The amount of gear adjustment is calculated based on the direction of gear adjustment, the gear adjustment step size of the on-load tap changer of the main transformer, the rated voltage of the low-voltage side of the main transformer, and the voltage difference. Calculate the estimated voltage after each gear adjustment based on the gear adjustment amount and voltage margin value at each moment. Calculate the upper and lower limits of the voltage optimization, perform trend analysis on the upper and lower limits of the voltage optimization at each moment, and obtain the optimized main transformer gear configuration curve, voltage upper limit and lower limit results; Output the optimized result.

2. The method according to claim 1, characterized in that, It also includes calculating the 110kV station's tap adjustment amount by referring to the main transformer tap adjustment amount of the 220kV station, comparing it with the 110kV station's main transformer tap adjustment amount at that moment, correcting the 110kV station's tap adjustment amount parameters, and using the corrected tap adjustment amount to calculate the set of upper and lower voltage optimization limits for the 110kV station's bus. When the upper limit of voltage optimization is greater than the upper limit of assessment, the upper limit of assessment shall be used for correction; when the lower limit of voltage optimization is less than the lower limit of assessment, the lower limit of assessment shall be used for correction. Trend analysis is performed on the set of upper and lower voltage optimization values ​​at each moment. Based on the trend, the time period is divided into several time periods, and the optimized gear configuration, upper voltage limit, and lower voltage limit results are obtained respectively. Fitting processing is performed on the time periods with similar voltage limits to form the optimization results.

3. The method according to claim 2, characterized in that, For a 110kV substation, the impact of tap change by the upstream 220kV substation should be considered, and the tap change amount G of the main transformer of the upstream 220kV substation should be calculated. 220 Afterwards, and the 110kV substation main transformer at that moment, G 110 Value comparison; If G 110 >G 220 >0, then G 110 By G 220 Correction, if G 220 ≥G 110 If the value is greater than 0, no correction is made. The formula is as follows: Among them, G 110 This indicates the main transformer's tap adjustment at that moment, G. 220 This indicates the adjustment range of the main transformer at the 220kV substation; with the corrected G... 110 Recalculate the upper and lower limits of the voltage optimization for the 110kV substation bus.

4. The method according to claim 1, characterized in that, The formula for calculating the voltage difference is: Vd i =V i -Vt i ; Among them, V i Vt represents the bus voltage at time i. i VD represents the voltage optimization target value. i This represents the voltage difference at time i; The formula for adjusting the gear direction is as follows: Where D represents the gear adjustment direction, 1 is to shift up, and 0 is to keep the original gear; The formula for calculating the gear adjustment amount is as follows: Where T represents the tap changer adjustment step size of the on-load tap changer of the main transformer, and V nom This indicates the rated voltage on the low-voltage side of the main transformer, and G indicates the range of adjustment. The formula for calculating the voltage estimate after the range adjustment is as follows: V es =V i +C×T×V nom +V mg ; Among them, V es This indicates the estimated voltage after adjustment, V. i Let V be the bus voltage at time i. mg This represents the voltage margin value, which is a settable parameter.

5. The method according to claim 1, characterized in that, The formulas for the set of upper and lower limits for voltage optimization are as follows: Where N represents the set of times, V opup,i V represents the optimized upper limit of voltage at time i. opdn,i This represents the optimized lower voltage limit at time i; Since the default setting only adjusts the voltage level upwards, the optimized lower voltage limit value V opdn Keep the original value V dn The optimized upper limit of voltage V opup As shown in the following formula: Among them, V opup This represents the optimized upper limit of voltage, V. es This indicates the estimated voltage after adjustment, V. opdn This represents the optimized lower voltage limit, V. dn G represents the original lower limit value, and G represents the gear adjustment amount.

6. The method according to claim 1, characterized in that, The optimized transformer gear configuration curve is given in units of 288 points per day, providing the optimized transformer gear at each moment. The optimized upper and lower limits of the bus voltage will divide the day into several time periods, and give the start time, end time, upper voltage limit, and lower voltage limit of each time period as the criteria for AVC control.

7. A tap position adjustment and bus voltage constraint optimization configuration system, characterized in that, include: The data acquisition module is used to acquire input data, including historical data of bus voltage, historical data of bus AVC control parameters, voltage optimization target value, historical data of main transformer tap position, rated voltage of the low voltage side of the main transformer, tap position adjustment step of the main transformer on-load tap changer, and the topological relationship between the bus and the main transformer of the upstream 220kV substation. The analysis and calculation module is used to perform calculations and trend analysis on the input data to obtain the voltage difference, adjustment direction, gear adjustment amount, voltage estimate after gear adjustment, upper and lower limits of optimized voltage, upper and lower limits of 110kV bus voltage optimization, and optimization results at each time point. The strategy output module is used to output the optimized main transformer gear configuration curve and the optimized upper and lower limits of the bus voltage.

8. The system according to claim 7, characterized in that, In the data acquisition module, the voltage optimization target value is obtained by the median of the voltage range; the rated voltage of the low-voltage side of the main transformer and the adjustment step size of the tap position of the on-load tap changer of the main transformer are obtained according to the parameters on the nameplate of the main transformer.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the computer program is loaded into the processor, it implements the method according to any one of claims 1-6.

10. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, it implements the method according to any one of claims 1-6.

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