No-load tap changer adjustment method, device, terminal equipment and storage medium

Abstract

The present invention discloses a method, apparatus, terminal device, and storage medium for adjusting an off-load tap changer. The method includes: obtaining a first number of times, within a preset first period, a first voltage level busbar timed out when operating above an upper limit and a second voltage level busbar timed out when operating below a lower limit, and a second number of times a first voltage level busbar timed out when operating below a lower limit and a second voltage level busbar timed out when operating above an upper limit; when the first number is greater than a preset first number threshold, lowering the gear position of the off-load tap changer of the first voltage level main transformer; and when the second number is greater than a preset second number threshold, raising the gear position of the off-load tap changer of the first voltage level main transformer. The present invention can rationally distribute the voltage on each side of the transformer, thereby improving system voltage quality and maintaining power grid security and stability.

Description

Technical Field

[0001] The present invention relates to the technical field of power grid dispatching, and in particular to a no-load tap changer adjustment method, device, terminal equipment and storage medium. Background Art

[0002] Automatic voltage control system is an important means to achieve safe, economical and high-quality operation of power grid. Its basic principle is to achieve reasonable distribution of reactive voltage in the power grid by coordinating and controlling the reactive output of generators, transformer taps and reactive compensation equipment.

[0003] Currently, regional power grid automatic voltage control systems still mostly utilize a three-level voltage control model based on "soft zoning." The three- and two-level voltage control functions are performed at the automatic voltage control master station in the regional power grid dispatching center. The primary voltage control target is the power plant or substation. The substation serves as a voltage monitoring and control point, and the automatic voltage control system generally uses capacitors and reactors for voltage regulation. Some substation main transformers are equipped with off-load tap changers, which are prone to irrational tap position issues. This can cause the high-voltage bus voltage on the substation's high-voltage side to be excessively high or low, while the medium-voltage bus voltage remains excessively low or high for extended periods, impacting the safe operation of the power grid. Therefore, an optimization and adjustment scheme for off-load tap changer planning has been proposed to ensure a generally reasonable voltage distribution on all sides of the transformer. This is crucial for ensuring power grid voltage quality and improving voltage compliance rates. Summary of the Invention

[0004] The present invention provides a no-load tap changer adjustment method, device, terminal equipment and storage medium to solve the technical problem of unreasonable gear layout of no-load tap changers.

[0005] In order to solve the above technical problems, an embodiment of the present invention provides a method for adjusting a no-load tap changer, comprising:

[0006] Obtaining, within a preset first cycle, a first number of times the first voltage level bus times out of an upper limit and the second voltage level bus times out of a lower limit, and a second number of times the first voltage level bus times out of a lower limit and the second voltage level bus times out of an upper limit;

[0007] When the first number is greater than a preset first number threshold, the gear position of the no-load tap changer of the first voltage level main transformer is reduced; when the second number is greater than a preset second number threshold, the gear position of the no-load tap changer of the first voltage level main transformer is increased.

[0008] As a preferred solution, the obtaining, within a preset first period, of the first number of times the first voltage level bus times out of the upper limit and the second voltage level bus times out of the lower limit, and the second number of times the first voltage level bus times out of the lower limit and the second level bus times out of the upper limit, includes:

[0009] During the first cycle, repeatedly performing data statistical operations several times according to a preset first frequency until the first cycle ends, obtaining a first number of times that the first voltage level bus operates for a long time above the upper limit and the second voltage level bus operates for a long time above the lower limit within the first cycle, and a second number of times that the first voltage level bus operates for a long time above the lower limit and the second voltage level bus operates for a long time above the upper limit;

[0010] The data statistical operation includes:

[0011] Obtain, within the current second cycle, a first duration that the first voltage level bus operates beyond the upper limit, a second duration that the second voltage level bus operates beyond the lower limit, a third duration that the first voltage level bus operates beyond the lower limit, and a fourth duration that the second voltage level bus operates beyond the upper limit; wherein, the second cycle is obtained by dividing the first cycle by time according to the first frequency; when the data statistical operation is performed for the first time, the current second cycle is the first second cycle within the first cycle;

[0012] When the first duration is greater than a preset first duration threshold and the second duration is greater than a preset second duration threshold, the value of the first number is increased by 1; wherein the initial value of the first number is 0;

[0013] When the third duration is greater than the preset third duration threshold and the fourth duration is greater than the preset fourth duration threshold, the value of the second number is increased by 1; wherein the initial value of the second number is 0;

[0014] The next second cycle is used as the second cycle of the next data statistics operation.

[0015] As a preferred solution, the obtaining, within the preset second cycle, of the first duration of the operation of the first voltage level bus exceeding the upper limit, the second duration of the operation of the second voltage level bus exceeding the lower limit, the third duration of the operation of the first voltage level bus exceeding the lower limit, and the fourth duration of the operation of the second voltage level bus exceeding the upper limit, includes:

[0016] In the second cycle, the data collection operation is repeatedly performed several times according to the preset second frequency until the current second cycle ends, and a first duration of the operation of the first voltage level bus exceeding the upper limit, a second duration of the operation of the second voltage level bus exceeding the lower limit, a third duration of the operation of the first voltage level bus exceeding the lower limit, and a fourth duration of the operation of the second voltage level bus exceeding the upper limit are obtained in the second cycle;

[0017] The data collection operation includes:

[0018] Obtaining, in real time within a current third period, a first voltage operating upper limit of a first voltage level bus, a first voltage operating lower limit of a first voltage level bus, a first voltage operating reference value of a first voltage level bus, a first real-time voltage of the first voltage level bus, a second voltage operating upper limit of a second voltage level bus, a second voltage operating lower limit of a second voltage level bus, a second voltage operating reference value of a second voltage level bus, and a second real-time voltage of the second voltage level bus; wherein, the third period is obtained by dividing the second period by time according to the second frequency; when the data acquisition operation is performed for the first time, the current third period is the first third period within the second period;

[0019] Determine, based on the first voltage operating upper limit, the first voltage operating reference value, and the first real-time voltage, whether the first voltage level bus has exceeded the upper limit in the current third period; if so, add the first duration and the third period, and update the first duration with the added result; wherein the initial value of the first duration is 0;

[0020] Based on the second voltage operating lower limit, the second voltage operating reference value, and the second real-time voltage, determining whether the second voltage level bus is operating beyond the lower limit in the current third period; if so, adding the second duration and the third period, and updating the second duration with the added result; wherein the initial value of the second duration is 0;

[0021] Determine, based on the first voltage operation lower limit, the first voltage operation reference value, and the first real-time voltage, whether the first voltage level bus operates beyond the lower limit in the current third period; if so, add the third time duration and the third period, and update the third time duration with the added result; wherein the initial value of the third time duration is 0;

[0022] Based on the second voltage operating upper limit, the second voltage operating reference value and the second real-time voltage, determine whether the second voltage level bus is operating above the upper limit in the current third period. If so, add the fourth time duration and the third period, and use the addition result to update the fourth time duration; wherein, the initial value of the fourth time duration is 0.

[0023] As a preferred solution, judging whether the first voltage level bus is operating beyond the upper limit in the current third cycle based on the first voltage operation upper limit, the first voltage operation reference value and the first real-time voltage includes:

[0024] Calculate a first voltage level busbar upper limit crossing judgment index according to the first voltage operation upper limit, the first voltage operation reference value and the first real-time voltage using a first upper limit crossing judgment index calculation formula;

[0025] If the first voltage level busbar over-upper limit judgment index is greater than a preset first index threshold, it is determined that the first voltage level busbar is operating over-upper limit in the third cycle; otherwise, it is determined that the first voltage level busbar is not operating over-upper limit in the third cycle;

[0026] The calculation formula of the first upper limit judgment indicator is:

[0027]

[0028] Where a represents the first upper limit judgment index; Indicates the first real-time voltage; Indicates the first voltage operating upper limit; Indicates the first voltage operating reference value; K c Indicates the bus voltage measurement over-limit coefficient.

[0029] As a preferred solution, judging whether the second voltage level bus is operating beyond the lower limit in the current third cycle based on the second voltage operation lower limit, the second voltage operation reference value and the second real-time voltage includes:

[0030] Calculate the second voltage level busbar lower limit crossing judgment index according to the second voltage operation lower limit, the second voltage operation reference value and the second real-time voltage using the first lower limit crossing judgment index calculation formula;

[0031] If the second voltage level busbar crossing the lower limit judgment index is less than a preset second index threshold, it is determined that the second voltage level busbar is operating under the lower limit in the third cycle; otherwise, it is determined that the second voltage level busbar is not operating under the lower limit in the third cycle;

[0032] The calculation formula of the first lower limit judgment index is:

[0033]

[0034] Where, b represents the first lower limit judgment index; Indicates the second real-time voltage; Indicates the second voltage operating lower limit; Indicates the second voltage operating reference value; K c Indicates the bus voltage measurement over-limit coefficient.

[0035] As a preferred solution, judging whether the first voltage level bus operates beyond the lower limit in the current third cycle based on the first voltage operation lower limit, the first voltage operation reference value and the first real-time voltage includes:

[0036] Calculate the first voltage level busbar lower limit judgment index according to the first voltage operation lower limit, the first voltage operation reference value and the first real-time voltage using the second lower limit judgment index calculation formula;

[0037] If the first voltage level busbar crossing the lower limit judgment index is less than a preset third index threshold, it is determined that the first voltage level busbar is operating under the lower limit in the third cycle; otherwise, it is determined that the first voltage level busbar is not operating under the lower limit in the third cycle;

[0038] The calculation formula of the second lower limit judgment index is:

[0039]

[0040] Where c represents the second lower limit judgment index; Indicates the first real-time voltage; Indicates the first voltage operating lower limit; Indicates the first voltage operating reference value; K c Indicates the bus voltage measurement over-limit coefficient.

[0041] As a preferred solution, judging whether the second voltage level bus is operating beyond the upper limit in the current third cycle based on the second voltage operation upper limit, the second voltage operation reference value, and the second real-time voltage includes:

[0042] Calculate the second voltage level busbar upper limit crossing judgment index according to the second voltage operation upper limit, the second voltage operation reference value and the second real-time voltage using the second upper limit crossing judgment index calculation formula;

[0043] If the second voltage level busbar exceeding the upper limit judgment index is greater than a preset fourth index threshold, it is determined that the second voltage level busbar is operating exceeding the upper limit in the third cycle; otherwise, it is determined that the second voltage level busbar is not operating exceeding the upper limit in the third cycle;

[0044] The calculation formula of the second upper limit judgment index is:

[0045]

[0046] Where, d represents the second upper limit judgment index; Indicates the second real-time voltage; Indicates the second voltage operating upper limit; Indicates the second voltage operating reference value; K c Indicates the bus voltage measurement over-limit coefficient.

[0047] On the basis of the above embodiment, another embodiment of the present invention provides a no-load tap changer adjustment device, comprising: a data acquisition module and a no-load tap changer adjustment module;

[0048] The data acquisition module is used to acquire, within a preset first period, a first number of times that the first voltage level bus times out of an upper limit and the second voltage level bus times out of a lower limit, and a second number of times that the first voltage level bus times out of a lower limit and the second voltage level bus times out of an upper limit;

[0049] The no-load tap changer adjustment module is configured to reduce the gear position of the no-load tap changer of the first voltage level main transformer when the first number is greater than a preset first number threshold; and to increase the gear position of the no-load tap changer of the first voltage level main transformer when the second number is greater than a preset second number threshold.

[0050] Based on the above embodiments, another embodiment of the present invention provides a terminal device, which includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, the no-load tap changer adjustment method described in the above embodiments of the invention is implemented.

[0051] Based on the above embodiment, another embodiment of the present invention provides a storage medium, wherein the storage medium includes a stored computer program, wherein when the computer program is executed, the device where the storage medium is located is controlled to execute the no-load tap changer adjustment method described in the above embodiment of the invention.

[0052] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0053] The present invention obtains a first number of times a first voltage level busbar times out of operation above its upper limit and a second voltage level busbar times out of operation above its lower limit within a preset first cycle, and a second number of times a first voltage level busbar times out of operation above its lower limit and a second voltage level busbar times out of operation above its upper limit. When the first number is greater than a preset first number threshold, the gear position of the no-load tap changer of the first voltage level main transformer is lowered; when the second number is greater than a preset second number threshold, the gear position of the no-load tap changer of the first voltage level main transformer is increased. The present invention reduces the gear position of the no-load tap changer of the first voltage level main transformer when a first voltage level busbar times out of operation above its upper limit and a second voltage level busbar times out of operation above its lower limit, and increases the gear position of the no-load tap changer of the first voltage level main transformer when a first voltage level busbar times out of operation above its upper limit and a second voltage level busbar times out of operation above its upper limit. Through the adjustment method of the present invention, the voltage distribution on each side of the transformer is basically reasonable, achieving the purpose of improving system voltage quality and maintaining power grid security and stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 This is a flow chart of a method for adjusting a no-load tap changer provided by one embodiment of the present invention;

[0055] Figure 2 The figure is a structural diagram of a no-load tap changer adjustment device provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0056] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0057] Example 1

[0058] Please refer to Figure 1 , which is a flow chart of a no-load tap changer adjustment method provided in one embodiment of the present invention, comprising:

[0059] S1. Obtain the first number of times the first voltage level bus times out of the upper limit and the second voltage level bus times out of the lower limit within a preset first cycle, and the second number of times the first voltage level bus times out of the lower limit and the second level bus times out of the upper limit.

[0060] It should be noted that the first voltage level busbar generally refers to the 500kV busbar, and the second voltage level busbar generally refers to the 220kV busbar.

[0061] The present invention involves three cycles: the first cycle, the second cycle, and the third cycle. The first cycle refers to the decision-making cycle, typically one day; the second cycle refers to the statistical cycle, typically one hour; and the third cycle refers to the data collection cycle, typically one minute or five minutes. The first cycle can be equally divided into several consecutive second cycles, and the second cycle can be equally divided into several consecutive third cycles.

[0062] If a behavior exceeds a certain percentage of the time within a certain time period, it is recorded as a timeout. The number of timeouts is used to count the number of timeouts that occur in several time periods.

[0063] In step S1, when a first cycle ends, the first number and second number of times within the first cycle are obtained. The first number refers to the number of times during the first cycle that a first voltage level bus times out of its upper limit while a second voltage level bus times out of its lower limit. The second number refers to the number of times during the first cycle that a first voltage level bus times out of its lower limit while a second voltage level bus times out of its upper limit.

[0064] In a preferred embodiment, obtaining, within a preset first period, a first number of times the first voltage level bus times out of an upper limit and the second voltage level bus times out of a lower limit, and a second number of times the first voltage level bus times out of a lower limit and the second voltage level bus times out of an upper limit includes:

[0065] During the first cycle, repeatedly performing data statistical operations several times according to a preset first frequency until the first cycle ends, obtaining a first number of times that the first voltage level bus operates for a long time above the upper limit and the second voltage level bus operates for a long time above the lower limit within the first cycle, and a second number of times that the first voltage level bus operates for a long time above the lower limit and the second voltage level bus operates for a long time above the upper limit;

[0066] The data statistical operation includes:

[0067] Obtain, within the current second cycle, a first duration that the first voltage level bus operates beyond the upper limit, a second duration that the second voltage level bus operates beyond the lower limit, a third duration that the first voltage level bus operates beyond the lower limit, and a fourth duration that the second voltage level bus operates beyond the upper limit; wherein, the second cycle is obtained by dividing the first cycle by time according to the first frequency; when the data statistical operation is performed for the first time, the current second cycle is the first second cycle within the first cycle;

[0068] When the first duration is greater than a preset first duration threshold and the second duration is greater than a preset second duration threshold, the value of the first number is increased by 1; wherein the initial value of the first number is 0;

[0069] When the third duration is greater than the preset third duration threshold and the fourth duration is greater than the preset fourth duration threshold, the value of the second number is increased by 1; wherein the initial value of the second number is 0;

[0070] The next second cycle is used as the second cycle of the next data statistics operation.

[0071] In this embodiment, in order to obtain the first and second times, it is necessary to count the number of times the above two timeout situations occur in the first cycle. To this end, the first cycle is divided into a number of consecutive second cycles, and the frequency of the second cycle update is the frequency of performing the data statistics operation, that is, the first frequency.

[0072] According to the order of all second periods within the first period, a data statistics operation is performed for each second period.

[0073] In each data statistical operation, a first duration, a second duration, a third duration, and a fourth duration in a second period corresponding to the data statistical operation are obtained. The first duration refers to the duration during which the first voltage level bus operates beyond the upper limit, the second duration refers to the duration during which the second voltage level bus operates beyond the lower limit, the third duration refers to the duration during which the first voltage level bus operates beyond the lower limit, and the fourth duration refers to the duration during which the second voltage level bus operates beyond the upper limit.

[0074] When the first time length is greater than the preset first time length threshold and the second time length is greater than the preset second time length threshold, it is considered that within the second cycle, there has been a situation where the first voltage level bus has timed out beyond the upper limit and the second voltage level bus has timed out beyond the lower limit, then the value of the first number is increased by 1.

[0075] When the third time duration is greater than the preset third time duration threshold and the fourth time duration is greater than the preset fourth time duration threshold, it is considered that within the second cycle, there has been a situation where the first voltage level bus has timed out at the lower limit and the second voltage level bus has timed out at the upper limit, and then the value of the second number is increased by 1.

[0076] In a preferred embodiment, the obtaining, within a preset second period, a first duration for the first voltage level bus to operate beyond the upper limit, a second duration for the second voltage level bus to operate beyond the lower limit, a third duration for the first voltage level bus to operate beyond the lower limit, and a fourth duration for the second voltage level bus to operate beyond the upper limit includes:

[0077] In the second cycle, the data collection operation is repeatedly performed several times according to the preset second frequency until the current second cycle ends, and a first duration of the operation of the first voltage level bus exceeding the upper limit, a second duration of the operation of the second voltage level bus exceeding the lower limit, a third duration of the operation of the first voltage level bus exceeding the lower limit, and a fourth duration of the operation of the second voltage level bus exceeding the upper limit are obtained in the second cycle;

[0078] The data collection operation includes:

[0079] Obtaining, in real time within a current third period, a first voltage operating upper limit of a first voltage level bus, a first voltage operating lower limit of a first voltage level bus, a first voltage operating reference value of a first voltage level bus, a first real-time voltage of the first voltage level bus, a second voltage operating upper limit of a second voltage level bus, a second voltage operating lower limit of a second voltage level bus, a second voltage operating reference value of a second voltage level bus, and a second real-time voltage of the second voltage level bus; wherein, the third period is obtained by dividing the second period by time according to the second frequency; when the data acquisition operation is performed for the first time, the current third period is the first third period within the second period;

[0080] Determine, based on the first voltage operating upper limit, the first voltage operating reference value, and the first real-time voltage, whether the first voltage level bus has exceeded the upper limit in the current third period; if so, add the first duration and the third period, and update the first duration with the added result; wherein the initial value of the first duration is 0;

[0081] Based on the second voltage operating lower limit, the second voltage operating reference value, and the second real-time voltage, determining whether the second voltage level bus is operating beyond the lower limit in the current third period; if so, adding the second duration and the third period, and updating the second duration with the added result; wherein the initial value of the second duration is 0;

[0082] Determine, based on the first voltage operation lower limit, the first voltage operation reference value, and the first real-time voltage, whether the first voltage level bus operates beyond the lower limit in the current third period; if so, add the third time duration and the third period, and update the third time duration with the added result; wherein the initial value of the third time duration is 0;

[0083] Based on the second voltage operating upper limit, the second voltage operating reference value and the second real-time voltage, determine whether the second voltage level bus is operating above the upper limit in the current third period. If so, add the fourth time duration and the third period, and use the addition result to update the fourth time duration; wherein, the initial value of the fourth time duration is 0.

[0084] In this embodiment, in order to obtain the first duration, second duration, third duration and fourth duration corresponding to each second period, the second period is divided into several consecutive third periods, and the frequency of updating the third period is the frequency of executing the data acquisition operation, that is, the second frequency.

[0085] According to the sequence of all third cycles within the second cycle, a data collection operation is performed for each cycle.

[0086] In each data acquisition operation, the first voltage operation upper limit, the first voltage operation lower limit, the first voltage operation reference value, the first real-time voltage, the second voltage operation upper limit, the second voltage operation lower limit, the second voltage operation reference value, and the second real-time voltage in the third period corresponding to the data acquisition operation are obtained. Among them, the first voltage operation upper limit refers to the voltage operation upper limit of the first voltage level bus, the first voltage operation lower limit refers to the voltage operation lower limit of the first voltage level bus, the first voltage operation reference value refers to the voltage operation reference value of the first voltage level bus, the first real-time voltage refers to the real-time voltage of the first voltage level bus, the second voltage operation upper limit refers to the voltage operation upper limit of the second voltage level bus, the second voltage operation lower limit refers to the voltage operation lower limit of the second voltage level bus, the second voltage operation reference value refers to the voltage operation reference value of the second voltage level bus, and the second real-time voltage refers to the real-time voltage of the second voltage level bus.

[0087] Based on the first voltage operating upper limit, the first voltage operating reference value and the first real-time voltage, determine whether the first voltage level bus operates above the upper limit in the current third cycle. If so, add the duration of the third cycle to the first duration.

[0088] Based on the second voltage operating lower limit, the second voltage operating reference value and the second real-time voltage, determine whether the second voltage level bus operates beyond the lower limit in the current third cycle. If so, add the length of the third cycle to the second time length.

[0089] Based on the first voltage operating lower limit, the first voltage operating reference value and the first real-time voltage, determine whether the first voltage level bus operates beyond the lower limit in the current third cycle. If so, add the duration of the third cycle to the third time length.

[0090] Based on the second voltage operating lower limit, the second voltage operating reference value and the second real-time voltage, determine whether the second voltage level bus operates above the upper limit in the current third cycle. If so, add the length of the third cycle to the fourth time length.

[0091] At the end of each data collection operation, the first duration, the second duration, the third duration and the fourth duration are reset to an initial value of 0.

[0092] In a preferred embodiment, judging whether the first voltage level bus is operating beyond the upper limit in the current third cycle based on the first voltage operation upper limit, the first voltage operation reference value, and the first real-time voltage includes:

[0093] Calculate a first voltage level busbar upper limit crossing judgment index according to the first voltage operation upper limit, the first voltage operation reference value and the first real-time voltage using a first upper limit crossing judgment index calculation formula;

[0094] If the first voltage level busbar over-upper limit judgment index is greater than a preset first index threshold, it is determined that the first voltage level busbar is operating over-upper limit in the third cycle; otherwise, it is determined that the first voltage level busbar is not operating over-upper limit in the third cycle;

[0095] The calculation formula of the first upper limit judgment indicator is:

[0096]

[0097] Where a represents the first upper limit judgment index; Indicates the first real-time voltage; Indicates the first voltage operating upper limit; Indicates the first voltage operating reference value; K c Indicates the bus voltage measurement over-limit coefficient.

[0098] In this embodiment, an upper limit crossing judgment indicator for the first voltage level bus is calculated based on the first voltage operation upper limit, the first voltage operation reference value, and the first real-time voltage using an upper limit crossing judgment indicator calculation formula. If the upper limit crossing judgment indicator for the first voltage level bus is greater than a preset first indicator threshold, then it is determined that the first voltage level bus is operating above the upper limit during the third period.

[0099] K c The general value is 0.003, which can be adjusted manually according to actual conditions.

[0100] In a preferred embodiment, judging whether the second voltage level bus operates beyond the lower limit in the current third cycle based on the second voltage operation lower limit, the second voltage operation reference value, and the second real-time voltage includes:

[0101] Calculate the second voltage level busbar lower limit crossing judgment index according to the second voltage operation lower limit, the second voltage operation reference value and the second real-time voltage using the first lower limit crossing judgment index calculation formula;

[0102] If the second voltage level busbar crossing the lower limit judgment index is less than a preset second index threshold, it is determined that the second voltage level busbar is operating under the lower limit in the third cycle; otherwise, it is determined that the second voltage level busbar is not operating under the lower limit in the third cycle;

[0103] The calculation formula of the first lower limit judgment index is:

[0104]

[0105] Where, b represents the first lower limit judgment index; Indicates the second real-time voltage; Indicates the second voltage operating lower limit; Indicates the second voltage operating reference value; K c Indicates the bus voltage measurement over-limit coefficient.

[0106] In this embodiment, a lower limit crossing judgment indicator for the second voltage level bus is calculated based on the second voltage operation lower limit, the second voltage operation reference value, and the second real-time voltage using a lower limit crossing judgment indicator calculation formula. If the lower limit crossing judgment indicator for the second voltage level bus is less than a preset second indicator threshold, then it is determined that the second voltage level bus is operating under a lower limit during the third period.

[0107] In a preferred embodiment, judging whether the first voltage level bus operates beyond the lower limit in the current third cycle based on the first voltage operation lower limit, the first voltage operation reference value, and the first real-time voltage includes:

[0108] Calculate the first voltage level busbar lower limit judgment index according to the first voltage operation lower limit, the first voltage operation reference value and the first real-time voltage using the second lower limit judgment index calculation formula;

[0109] If the first voltage level busbar crossing the lower limit judgment index is less than a preset third index threshold, it is determined that the first voltage level busbar is operating under the lower limit in the third cycle; otherwise, it is determined that the first voltage level busbar is not operating under the lower limit in the third cycle;

[0110] The calculation formula of the second lower limit judgment index is:

[0111]

[0112] Where c represents the second lower limit judgment index; Indicates the first real-time voltage; Indicates the first voltage operating lower limit; Indicates the first voltage operating reference value; K c Indicates the bus voltage measurement over-limit coefficient.

[0113] In this embodiment, a first voltage level bus lower limit crossing judgment indicator is calculated based on the first voltage operation lower limit, the first voltage operation reference value, and the first real-time voltage using a lower limit crossing judgment indicator calculation formula. If the first voltage level bus lower limit crossing judgment indicator is less than a preset third indicator threshold, then the first voltage level bus is determined to be operating at an under-limit crossing during the third period.

[0114] In a preferred embodiment, judging whether the second voltage level bus is operating beyond the upper limit in the current third cycle based on the second voltage operation upper limit, the second voltage operation reference value, and the second real-time voltage includes:

[0115] Calculate the second voltage level busbar upper limit crossing judgment index according to the second voltage operation upper limit, the second voltage operation reference value and the second real-time voltage using the second upper limit crossing judgment index calculation formula;

[0116] If the second voltage level busbar exceeding the upper limit judgment index is greater than a preset fourth index threshold, it is determined that the second voltage level busbar is operating exceeding the upper limit in the third cycle; otherwise, it is determined that the second voltage level busbar is not operating exceeding the upper limit in the third cycle;

[0117] The calculation formula of the second upper limit judgment index is:

[0118]

[0119] Where, d represents the second upper limit judgment index; Indicates the second real-time voltage; Indicates the second voltage operating upper limit; Indicates the second voltage operating reference value; K c Indicates the bus voltage measurement over-limit coefficient.

[0120] In this embodiment, an upper limit crossing judgment indicator for the second voltage level bus is calculated based on the second voltage operation upper limit, the second voltage operation reference value, and the second real-time voltage using an upper limit crossing judgment indicator calculation formula. If the upper limit crossing judgment indicator for the second voltage level bus is greater than a preset fourth indicator threshold, then it is determined that the first voltage level bus is operating above the upper limit during the third period.

[0121] S2. When the first number is greater than a preset first number threshold, lower the gear of the no-load tap changer of the first voltage level main transformer; when the second number is greater than a preset second number threshold, increase the gear of the no-load tap changer of the first voltage level main transformer.

[0122] In step S2, when the first number is greater than the preset first number threshold, it is considered that the voltage of the first voltage level bus is too high for a long time and the voltage of the second voltage level bus is too low for a long time, then the gear of the no-load tap changer of the first voltage level main transformer is reduced to reduce the voltage of the first voltage level and increase the voltage of the second voltage level.

[0123] When the second number is greater than the preset second number threshold, it is considered that the voltage of the first voltage level bus is too low for a long time and the voltage of the second voltage level bus is too high for a long time, then the gear of the no-load tap changer of the first voltage level main transformer is increased to increase the voltage of the first voltage level and reduce the voltage of the second voltage level.

[0124] It should be noted that the no-load tap changer adjustment method provided by the present invention addresses the current problem of improper main transformer tap position in substations, which can lead to prolonged high or low bus voltages on the high-voltage side of the substation, and conversely, low or high bus voltages on the low-voltage side. This adjustment method ensures a substantially reasonable voltage distribution on each side of the transformer, thereby improving system voltage quality and maintaining a safe and stable power grid. Furthermore, the present invention offers the advantages of high speed, high accuracy, and reduced labor costs.

[0125] Example 2

[0126] Please refer to Figure 2 , is a structural diagram of a no-load tap changer adjustment device provided by an embodiment of the present invention, comprising: a data acquisition module and a no-load tap changer adjustment module;

[0127] The data acquisition module is used to acquire, within a preset first period, a first number of times that the first voltage level bus times out of an upper limit and the second voltage level bus times out of a lower limit, and a second number of times that the first voltage level bus times out of a lower limit and the second voltage level bus times out of an upper limit;

[0128] The no-load tap changer adjustment module is configured to reduce the gear position of the no-load tap changer of the first voltage level main transformer when the first number is greater than a preset first number threshold; and to increase the gear position of the no-load tap changer of the first voltage level main transformer when the second number is greater than a preset second number threshold.

[0129] Example 3

[0130] Accordingly, an embodiment of the present invention provides a terminal device, which includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, the no-load tap changer adjustment method described in the above-mentioned embodiment of the invention is implemented.

[0131] Example 4

[0132] Accordingly, an embodiment of the present invention provides a storage medium, which includes a stored computer program. When the computer program is executed, the device where the storage medium is located is controlled to execute the no-load tap changer adjustment method described in the above embodiment of the invention.

[0133] It should be noted that the device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed across multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment. In addition, in the drawings of the device embodiments provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, which may be specifically implemented as one or more communication buses or signal lines. A person of ordinary skill in the art can understand and implement the present invention without inventive work.

[0134] Those skilled in the art will clearly understand that for the sake of convenience and brevity, the specific working process of the device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0135] The terminal device may be a computing device such as a desktop computer, a notebook computer, a PDA, a cloud server, etc. The terminal device may include, but is not limited to, a processor and a memory.

[0136] The processor may be a central processing unit (CPU), or other general-purpose processors, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc. The processor is the control center of the device, and various parts of the entire device are connected using various interfaces and lines.

[0137] The memory can be used to store the computer program, and the processor realizes various functions of the device by running or executing the computer program stored in the memory and calling the data stored in the memory. The memory can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, at least one application required for a function, etc.; the data storage area can store data created according to the use of the mobile phone, etc. In addition, the memory can include a high-speed random access memory, and can also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Med ia Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other volatile solid-state storage device.

[0138] The storage medium is a storage medium in which the computer program is stored. When the computer program is executed by the processor, the steps of each of the above-mentioned method embodiments can be implemented. The computer program includes computer program code, which can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electric carrier signals and telecommunication signals.

[0139] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for adjusting a no-load tap changer, characterized in that: include: Obtaining, within a preset first cycle, a first number of times the first voltage level bus times out of an upper limit and the second voltage level bus times out of a lower limit, and a second number of times the first voltage level bus times out of a lower limit and the second voltage level bus times out of an upper limit; When the first number is greater than a preset first number threshold, the gear position of the no-load tap changer of the first voltage level main transformer is lowered; when the second number is greater than a preset second number threshold, the gear position of the no-load tap changer of the first voltage level main transformer is increased; The obtaining of the first number of times the first voltage level bus times out of the upper limit and the second voltage level bus times out of the lower limit within a preset first period, and the second number of times the first voltage level bus times out of the lower limit and the second voltage level bus times out of the upper limit, includes: During the first cycle, repeatedly performing data statistical operations several times according to a preset first frequency until the first cycle ends, obtaining a first number of times that the first voltage level bus operates for a long time above the upper limit and the second voltage level bus operates for a long time above the lower limit within the first cycle, and a second number of times that the first voltage level bus operates for a long time above the lower limit and the second voltage level bus operates for a long time above the upper limit; The data statistical operation includes: Obtain, within the current second cycle, a first duration that the first voltage level bus operates beyond the upper limit, a second duration that the second voltage level bus operates beyond the lower limit, a third duration that the first voltage level bus operates beyond the lower limit, and a fourth duration that the second voltage level bus operates beyond the upper limit; wherein, the second cycle is obtained by dividing the first cycle by time according to the first frequency; when the data statistical operation is performed for the first time, the current second cycle is the first second cycle within the first cycle; When the first duration is greater than a preset first duration threshold and the second duration is greater than a preset second duration threshold, the value of the first number is increased by 1; wherein the initial value of the first number is 0; When the third duration is greater than the preset third duration threshold and the fourth duration is greater than the preset fourth duration threshold, the value of the second number is increased by 1; wherein the initial value of the second number is 0; The next second cycle is used as the second cycle of the next data statistics operation.

2. The no-load tap changer adjustment method according to claim 1, characterized in that: The obtaining, in the current second cycle, a first duration for the first voltage level bus to operate beyond the upper limit, a second duration for the second voltage level bus to operate beyond the lower limit, a third duration for the first voltage level bus to operate beyond the lower limit, and a fourth duration for the second voltage level bus to operate beyond the upper limit, includes: In the second cycle, the data collection operation is repeatedly performed several times according to the preset second frequency until the current second cycle ends, and a first duration of the operation of the first voltage level bus exceeding the upper limit, a second duration of the operation of the second voltage level bus exceeding the lower limit, a third duration of the operation of the first voltage level bus exceeding the lower limit, and a fourth duration of the operation of the second voltage level bus exceeding the upper limit are obtained in the second cycle; The data collection operation includes: Obtaining, in real time within a current third period, a first voltage operating upper limit of a first voltage level bus, a first voltage operating lower limit of a first voltage level bus, a first voltage operating reference value of a first voltage level bus, a first real-time voltage of the first voltage level bus, a second voltage operating upper limit of a second voltage level bus, a second voltage operating lower limit of a second voltage level bus, a second voltage operating reference value of a second voltage level bus, and a second real-time voltage of the second voltage level bus; wherein, the third period is obtained by dividing the second period by time according to the second frequency; when the data acquisition operation is performed for the first time, the current third period is the first third period within the second period; Determine, based on the first voltage operating upper limit, the first voltage operating reference value, and the first real-time voltage, whether the first voltage level bus has exceeded the upper limit in the current third period; if so, add the first duration and the third period, and update the first duration with the added result; wherein the initial value of the first duration is 0; Based on the second voltage operating lower limit, the second voltage operating reference value, and the second real-time voltage, determining whether the second voltage level bus is operating beyond the lower limit in the current third period; if so, adding the second duration and the third period, and updating the second duration with the added result; wherein the initial value of the second duration is 0; Determine, based on the first voltage operation lower limit, the first voltage operation reference value, and the first real-time voltage, whether the first voltage level bus operates beyond the lower limit in the current third period; if so, add the third time duration and the third period, and update the third time duration with the added result; wherein the initial value of the third time duration is 0; Based on the second voltage operating upper limit, the second voltage operating reference value and the second real-time voltage, determine whether the second voltage level bus is operating above the upper limit in the current third period. If so, add the fourth time duration and the third period, and use the addition result to update the fourth time duration; wherein, the initial value of the fourth time duration is 0.

3. The no-load tap changer adjustment method according to claim 2, characterized in that: The determining, based on the first voltage operation upper limit, the first voltage operation reference value, and the first real-time voltage, whether the first voltage level bus operates beyond the upper limit in the current third cycle includes: Calculate a first voltage level busbar upper limit crossing judgment index according to the first voltage operation upper limit, the first voltage operation reference value and the first real-time voltage using a first upper limit crossing judgment index calculation formula; If the first voltage level busbar over-upper limit judgment index is greater than a preset first index threshold, it is determined that the first voltage level busbar is operating over-upper limit in the third cycle; otherwise, it is determined that the first voltage level busbar is not operating over-upper limit in the third cycle; The calculation formula of the first upper limit judgment indicator is: Where a represents the first upper limit judgment index; Indicates the first real-time voltage; Indicates the first voltage operating upper limit; Indicates the first voltage operating reference value; K c Indicates the bus voltage measurement over-limit coefficient.

4. The no-load tap changer adjustment method according to claim 2, characterized in that: The determining, based on the second voltage operation lower limit, the second voltage operation reference value, and the second real-time voltage, whether the second voltage level bus operates beyond the lower limit in the current third cycle includes: Calculate the second voltage level busbar lower limit crossing judgment index according to the second voltage operation lower limit, the second voltage operation reference value and the second real-time voltage using the first lower limit crossing judgment index calculation formula; If the second voltage level busbar crossing the lower limit judgment index is less than a preset second index threshold, it is determined that the second voltage level busbar is operating under the lower limit in the third cycle; otherwise, it is determined that the second voltage level busbar is not operating under the lower limit in the third cycle; The calculation formula of the first lower limit judgment index is: Where, b represents the first lower limit judgment index; Indicates the second real-time voltage; Indicates the second voltage operating lower limit; Indicates the second voltage operating reference value; K c Indicates the bus voltage measurement over-limit coefficient.

5. The no-load tap changer adjustment method according to claim 2, characterized in that: The determining, based on the first voltage operation lower limit, the first voltage operation reference value, and the first real-time voltage, whether the first voltage level bus operates beyond the lower limit in the current third cycle includes: Calculate the first voltage level busbar lower limit judgment index according to the first voltage operation lower limit, the first voltage operation reference value and the first real-time voltage using the second lower limit judgment index calculation formula; If the first voltage level busbar crossing the lower limit judgment index is less than a preset third index threshold, it is determined that the first voltage level busbar is operating under the lower limit in the third cycle; otherwise, it is determined that the first voltage level busbar is not operating under the lower limit in the third cycle; The calculation formula of the second lower limit judgment index is: Where c represents the second lower limit judgment index; Indicates the first real-time voltage; Indicates the first voltage operating lower limit; Indicates the first voltage operating reference value; K c Indicates the bus voltage measurement over-limit coefficient.

6. The no-load tap changer adjustment method according to claim 2, characterized in that: The determining, based on the second voltage operation upper limit, the second voltage operation reference value, and the second real-time voltage, whether the second voltage level bus operates beyond the upper limit in the current third cycle includes: Calculate the second voltage level busbar upper limit crossing judgment index according to the second voltage operation upper limit, the second voltage operation reference value and the second real-time voltage using the second upper limit crossing judgment index calculation formula; If the second voltage level busbar exceeding the upper limit judgment index is greater than a preset fourth index threshold, it is determined that the second voltage level busbar is operating exceeding the upper limit in the third cycle; otherwise, it is determined that the second voltage level busbar is not operating exceeding the upper limit in the third cycle; The calculation formula of the second upper limit judgment index is: Where, d represents the second upper limit judgment index; Indicates the second real-time voltage; Indicates the second voltage operating upper limit; Indicates the second voltage operating reference value; K c Indicates the bus voltage measurement over-limit coefficient.

7. A no-load tap changer adjustment device, characterized in that: include: Data acquisition module and no-load tap changer adjustment module; The data acquisition module is used to acquire, within a preset first period, a first number of times that the first voltage level bus times out of an upper limit and the second voltage level bus times out of a lower limit, and a second number of times that the first voltage level bus times out of a lower limit and the second voltage level bus times out of an upper limit; The no-load tap changer adjustment module is configured to reduce the gear position of the no-load tap changer of the first voltage level main transformer when the first number is greater than a preset first number threshold; and increase the gear position of the no-load tap changer of the first voltage level main transformer when the second number is greater than a preset second number threshold; The obtaining of the first number of times the first voltage level bus times out of the upper limit and the second voltage level bus times out of the lower limit within a preset first period, and the second number of times the first voltage level bus times out of the lower limit and the second voltage level bus times out of the upper limit, includes: During the first cycle, repeatedly performing data statistical operations several times according to a preset first frequency until the first cycle ends, obtaining a first number of times that the first voltage level bus operates for a long time above the upper limit and the second voltage level bus operates for a long time above the lower limit within the first cycle, and a second number of times that the first voltage level bus operates for a long time above the lower limit and the second voltage level bus operates for a long time above the upper limit; The data statistical operation includes: Obtain, within the current second cycle, a first duration that the first voltage level bus operates beyond the upper limit, a second duration that the second voltage level bus operates beyond the lower limit, a third duration that the first voltage level bus operates beyond the lower limit, and a fourth duration that the second voltage level bus operates beyond the upper limit; wherein, the second cycle is obtained by dividing the first cycle by time according to the first frequency; when the data statistical operation is performed for the first time, the current second cycle is the first second cycle within the first cycle; When the first duration is greater than a preset first duration threshold and the second duration is greater than a preset second duration threshold, the value of the first number is increased by 1; wherein the initial value of the first number is 0; When the third duration is greater than the preset third duration threshold and the fourth duration is greater than the preset fourth duration threshold, the value of the second number is increased by 1; wherein the initial value of the second number is 0; The next second cycle is used as the second cycle of the next data statistics operation.

8. A terminal device, characterized in that: The system comprises a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, the method for adjusting the no-load tap changer according to any one of claims 1 to 6 is implemented.

9. A storage medium, characterized in that: The storage medium includes a stored computer program, wherein when the computer program is executed, the device where the storage medium is located is controlled to execute the no-load tap changer adjustment method according to any one of claims 1 to 6.

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