A transformer gear adjustment method, system, device and medium

Abstract

The present disclosure relates to the field of electric power technology, and provides a transformer gear adjustment method, system, equipment and medium, the method comprising: obtaining voltage data of a target low-voltage user group, and screening out the substations to which users with voltage indexes lower than a threshold value belong, and listing them as unqualified substations. Calculate the voltage value probability of each substation to obtain the voltage average and variance; select the substation with the smallest voltage variance and a user voltage index of 100% in the power supply line as the reference substation; calculate the relative entropy between the unqualified substation and the reference substation, screen out the substations with relative entropy and variance less than the threshold, identify them as substations that need gear adjustment, and adjust their transformer gears to stabilize user voltage. This method can find substation transformers with abnormal gear settings so as to adjust them.

Description

Technical Field

[0001] The present invention relates to the field of electric power technology, and in particular to a transformer gear adjustment method, system, equipment and medium. Background Art

[0002] With the increasing diversification of electricity demand and the continuous updating and iteration of power-consuming equipment, the load composition of the substation has become increasingly complex, covering multiple types such as industrial electricity, commercial electricity, and residential electricity. Different types of loads have significant differences in electricity consumption characteristics, electricity consumption time periods, etc.

[0003] However, many power grid provinces have a prominent problem in selecting the level of transformer taps in the new transformer installation process. When performing transformer level selection operations, relevant staff do not fully consider these complex and variable load components and their actual capacity requirements. They often determine the level of transformers in the area based on past work habits. This lack of accurate analysis and targeted considerations can easily lead to a series of adverse consequences.

[0004] Among them, the most notable is the problem of user voltage exceeding the limit, which may cause the voltage at some user ends to be too high, exceeding the rated voltage range of the electrical equipment, thereby accelerating equipment aging, increasing energy consumption, and may even cause equipment failure and safety hazards; while another part of the users may face the situation of too low voltage, making it impossible for electrical equipment to operate normally, affecting the normal order of production and life, and in severe cases may also cause an impact on the stability and reliability of the entire power grid, which is not conducive to the efficient, safe and stable operation of the power system and the optimal allocation and rational utilization of power resources.

[0005] In summary, the prior art has the problem of improper transformer gear selection when a new transformer is put into operation. Summary of the invention

[0006] To solve the above problems, the present disclosure provides a transformer gear adjustment method, system, device and medium, which adopts comparative relative entropy and variance to select the substation area with gear abnormality so as to adjust the gear of the transformer therein.

[0007] The following is the technology of the present invention:

[0008] A transformer gear adjustment method, characterized by comprising:

[0009] Obtain voltage data of the target low-voltage user group;

[0010] Based on the user meter voltage data, the substations of users with user voltage indexes lower than the threshold are screened out from all substations as unqualified substations;

[0011] Calculate the probability of occurrence of each voltage value at each substation gateway in all substations; calculate the average value of the substation gateway voltage based on the probability of occurrence of each voltage value at each substation gateway in all substations, and calculate the variance of each substation voltage based on the average value of the substation gateway voltage; select the substation with the smallest variance of the substation voltage and a voltage index of 100% for all users under each power supply line as the reference substation under the current power supply line;

[0012] Based on the probability of occurrence of each voltage value at each gateway in all substations, the relative entropy between the substation with unqualified user voltage index and the reference substation under each power supply line is calculated in turn;

[0013] Screen out the unqualified areas whose relative entropy and variance are both less than the threshold value as the areas that need to adjust the gear position;

[0014] Adjust the gear of the transformer in the substation where the gear adjustment is required so that the user voltage is maintained at a reasonable value.

[0015] Further,

[0016] The calculation of the probability of occurrence of each voltage value at each area gateway in all areas includes:

[0017] Round off all voltage data;

[0018] The rounded voltage data is used to calculate the probability of occurrence of each voltage value at each substation in all substations:

[0019]

[0020] Where: n For the n Areas; T is the total number of areas; j For the j Voltage value; J is the number of different voltage values; For the n The next area j The probability of a voltage value occurring; For the n The next area j The number of voltage values; For the n The total number of all voltages in a zone.

[0021] Further,

[0022] The calculating the average value of the voltage at each gateway of each substation based on the probability of occurrence of each voltage value at each gateway of all substations includes:

[0023]

[0024] Where: For the n The average voltage of each area; For the n The next area j A voltage value.

[0025] Further,

[0026] The calculation of the variance of each substation voltage based on the average value of the substation gateway voltage includes:

[0027]

[0028] In the formula, For the n The variance of the voltage in each area.

[0029] Further,

[0030] The relative entropy is calculated as:

[0031]

[0032] Where: For the n The relative entropy between the station area and the reference station area; For reference area j The probability of a voltage value occurring; J is the number of different voltage values; T The total number of areas.

[0033] Further,

[0034] The step of adjusting the gear position of the transformer in the substation area where the gear position needs to be adjusted so that the user voltage is maintained at a reasonable value includes:

[0035] For the areas where the user voltage exceeds the limit, the maximum value of the user voltage difference exceeding the limit in each area is calculated respectively;

[0036] The adjustment gear of the transformer in the substation is calculated based on the maximum value of the over-limit voltage difference of the users in each substation, and the gear of the transformer in the substation is adjusted to maintain the user voltage at a reasonable value.

[0037] Further,

[0038] The calculation of the maximum value of the over-limit voltage difference of each user in each substation area includes:

[0039] For the area where the user voltage exceeds the upper limit, the maximum value of the voltage difference of each area where the user exceeds the upper limit is:

[0040]

[0041] In the formula, The number of areas where the user voltage exceeds the upper limit; For the n The maximum value of the voltage difference that exceeds the upper limit for users in each area; For the n The maximum value of the voltage of all users in a substation area; Rated voltage for users.

[0042] Further,

[0043] The step of calculating the adjustable gear of the transformer in the substation area based on the maximum value of the over-limit voltage difference of each substation area user includes:

[0044] For areas where the user voltage exceeds the upper limit, the gear should be adjusted to:

[0045]

[0046] Where: For the n The gear position that the transformer in each area should be adjusted; For the n The actual voltage on the high-voltage side of each transformer in each substation; For the n The actual voltage on the low-voltage side of each transformer in each substation; For the n The actual current gear position of the transformer in each substation.

[0047] Further,

[0048] The calculation of the maximum value of the over-limit voltage difference of each user in each substation area includes:

[0049] For the area where the user voltage is lower than the lower limit, the maximum value of the voltage difference of each area where the user voltage is lower than the lower limit is:

[0050]

[0051] In the formula, The number of areas where the user voltage exceeds the lower limit; For the n The maximum value of the voltage difference that exceeds the lower limit for users in each area; For the n The minimum voltage of all users in a substation area.

[0052] Further,

[0053] The step of calculating the adjustable gear of the transformer in the substation area based on the maximum value of the over-limit voltage difference of each substation area user includes:

[0054] For the area where the user voltage exceeds the lower limit, the gear should be adjusted to:

[0055]

[0056] Where: For the n The gear position that the transformer in each area should be adjusted; For the n The actual voltage on the high-voltage side of each transformer in each substation; For the n The actual voltage on the low-voltage side of the transformer in each substation.

[0057] Further,

[0058] The method of screening out the substations to which users with voltage indexes lower than a threshold value belong from all substations based on the user meter voltage data as unqualified substations comprises:

[0059] Calculate the voltage index for each user:

[0060]

[0061] Where: i For the i Users; M is the total number of users; For the i Voltage index of each user; For the i The number of qualified user voltages, For the i The total number of user voltages;

[0062] The substations to which users with voltage indexes less than the threshold are screened out are unqualified substations.

[0063] Further,

[0064] The user meter voltage data of the target low-voltage user group is the voltage data of the target low-voltage user group in the latest three months.

[0065] Further,

[0066] The step-up adjustment of the transformer in the substation area is performed so that the voltage for users is maintained at a reasonable value;

[0067] When the transformer's adjustable gear position does not match the actual adjustable gear position in value:

[0068] If the user voltage exceeds the upper limit, adjust the transformer to a level difference not less than A higher gear;

[0069] If the user voltage exceeds the lower limit, adjust the transformer to a level difference not less than lower gear.

[0070] A transformer gear adjustment system, characterized by comprising:

[0071] Data acquisition module, used to obtain voltage data of the target low-voltage user group

[0072] An unqualified area screening module is used to screen out the areas where users with a voltage index lower than a threshold value belong from all areas based on the user meter voltage data as unqualified areas;

[0073] The reference substation screening module is used to calculate the probability of occurrence of each voltage value at each substation gateway in all substations; the average value of the substation gateway voltage is calculated based on the probability of occurrence of each voltage value at each substation gateway in all substations, and the variance of each substation voltage is calculated based on the average value of the substation gateway voltage; the substation with the smallest variance of the substation voltage and a voltage index of 100% for all users is selected as the reference substation under the current power supply line;

[0074] A calculation module, used for calculating the relative entropy between the substation with unqualified user voltage index and the reference substation under each power supply line in turn based on the probability of occurrence of each voltage value at each substation gateway in all substations;

[0075] A screening module is used to screen out the unqualified areas whose relative entropy and variance are both less than the threshold value as the areas that need to adjust the gear position;

[0076] The adjustment module is used to adjust the gear of the transformer in the substation where the gear adjustment is required, so that the user voltage is maintained at a reasonable value.

[0077] Compared with the prior art, the present invention has the following advantages:

[0078] The present invention obtains the historical voltage data of the target low-voltage user group to fully understand the past situation of the transformer area voltage. Based on these data, the transformer area to which the user whose voltage index is lower than the threshold belongs is screened out as an unqualified transformer area, and the area where the transformer gear problem may exist can be accurately located.

[0079] Then, the probability, average value and variance of each voltage value at the substation gate in all substations are calculated, so as to grasp the distribution and fluctuation characteristics of the substation voltage. Under each power supply line, the substation with the smallest voltage variance and a voltage index of 100% for all users in the substation is selected as the reference substation. Then, based on the probability, the relative entropy between the substation with unqualified user voltage index and the reference substation under each power supply line is calculated. Under the condition that the relative entropy and variance are both less than the threshold, the substation that needs to adjust the gear is screened out from the unqualified substations.

[0080] From the perspective of relative entropy, when the voltage in the substation is unqualified only due to unreasonable transformer gear setting, its voltage probability distribution curve is highly consistent with the reference substation and has a small relative entropy. Relative entropy measures the relative change in the amount of information in the voltage probability distribution. The small relative entropy of the unqualified substation means that the waveform of its voltage probability distribution curve is closer to the reference substation, which means that the voltage problem of the unqualified substation is mainly caused by the gear. This can be used to screen out the substations whose voltage is unqualified mainly due to abnormal transformer gear. From the perspective of variance, the variance reflects the discrete degree or fluctuation size of the substation voltage. A small variance means that the voltage fluctuation is small and the situation is stable. Among the unqualified substations, the substations with variances less than the threshold are more likely to have voltage problems caused by the stable factor of the transformer gear, rather than large fluctuations caused by unstable factors such as external interference, thereby excluding the substations whose voltage is unqualified due to temporary interference but has little to do with the transformer gear.

[0081] Subsequently, the gear adjustment is carried out on the substations with adjustable gears, and the gear to be adjusted is calculated based on the user voltage exceeding the limit situation, so that the output voltage is adjusted to a reasonable value, thereby solving the user voltage exceeding the limit problem caused by improper transformer gear setting, and ensuring the normal operation of user equipment and the stability and reliability of the power grid.

[0082] Other features and advantages of the present disclosure will be described in the following description, and partly become apparent from the description, or be understood by implementing the present disclosure. The purpose and other advantages of the present disclosure can be realized and obtained by the structures pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0083] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0084] Figure 1 A schematic diagram of the method of the present invention is shown. DETAILED DESCRIPTION

[0085] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0086] Figure 1A schematic diagram of the method according to the present invention is shown, and the specific implementation details of the present invention include:

[0087] Adjust the gear area filter:

[0088] 1. Step 1: Screening the areas where the user voltage index is unqualified

[0089] 1) In order to ensure the timeliness of the screening results, the voltage data of the target low-voltage user group in the last three months are selected as the basis for analysis, and the voltage data of the target low-voltage user group in the power user electricity consumption information collection system are exported to the database.

[0090] 2) Calculate the voltage index of each user:

[0091]

[0092] Where: i For the i Users; M is the total number of users; For the i Voltage index of each user; For the i The number of users with qualified voltage is in accordance with the national standard "Power Quality Supply Voltage Deviation" (GB / T 12325-2008), 220V single-phase power supply voltage deviation is +7%, -10% of the nominal voltage; For the i The total number of user voltages.

[0093] 3) Screen out the voltage index The area to which users with a value less than the threshold (the threshold can be selected as 95%) belong is an unqualified area.

[0094] Step 2: Screen the areas that need to adjust the gear from the areas where the user voltage index is unqualified

[0095] 1) Export the low-voltage side voltage data of the gateway meter in the power user electricity consumption information collection system in the last three months to the database;

[0096] 2) All voltage data are rounded off, rounded up or rounded down;

[0097] 3) Calculate the probability of occurrence of each voltage value at each substation in all substations:

[0098]

[0099] Where: n For the n Areas; T is the total number of areas;j For the j Voltage value; J is the number of different voltage values; For the n The next area j The probability of a voltage value occurring; For the n The next area j The number of voltage values; For the n The total number of all voltages in a zone.

[0100] 4) Calculate the average value of the station area's gate voltage:

[0101]

[0102] Where: For the n The average voltage of each area; For the n The next area j A voltage value.

[0103] 5) Calculate the variance of the voltage in each station area:

[0104]

[0105] In the formula, For the n The variance of the voltage in each area.

[0106] 6) Select the reference substation of each distribution network power supply line in turn for calculating relative entropy. The selection basis of the reference substation is that the voltage variance of the substation under this power supply line is the smallest and the voltage index of all users in the substation is =100%.

[0107] 7) Calculate the relative entropy between the substation with unqualified user voltage index and the reference substation under each distribution network power supply line in turn:

[0108]

[0109] Where: For the n The relative entropy between the station area and the reference station area; For reference area j The probability of a voltage value occurring.

[0110] Screen out the areas where the relative entropy and variance are both less than the threshold from the areas where the user voltage index is unqualified, and these areas are the areas that need to adjust the gear. The threshold can be set manually.

[0111] principle:

[0112] As the source of power supply for the substation, the fluctuation of bus voltage will be reflected in the voltage of the substation gateway meter and the substation user meter.

[0113] When the substation is not affected by other complex factors such as distributed photovoltaics and three-phase imbalance, and the voltage is unqualified only due to unreasonable transformer gear settings, the waveforms of the voltage probability distribution curves of the three are highly consistent. This consistency reflects the transmission characteristics of the voltage problem within the substation, that is, the similarity of the influence of the single factor of transformer gear at each level of voltage monitoring points.

[0114] Relative entropy can be used to measure the relative change in the amount of information between the probability distributions of two voltages at the same level or between the upper and lower levels.

[0115] In the case where the voltage exceeds the limit simply due to unreasonable gear position, the voltage information change of the entire substation is relatively simple, and no new and complex voltage fluctuation factors are introduced, which will not lead to a significant increase in entropy, that is, the value of relative entropy is very small. Based on this feature, when troubleshooting and diagnosing voltage problems in many substations, the substations with small relative entropy can be screened to find out the substations with unqualified voltage due to transformer gear setting problems. Through this screening method based on relative entropy, the scope of problem investigation can be quickly narrowed, the work efficiency of power operation and maintenance personnel can be improved, the transformer gear can be adjusted and optimized in a targeted manner, and the power quality at the user end can be improved.

[0116] In the context of the rapid development of the power industry today, the power user electricity consumption information collection system has been widely popularized and applied. Based on the substation voltage data contained in the power user electricity consumption information collection system, the relative entropy calculation work is greatly facilitated. The calculation process of relative entropy involves the precise quantification of the degree of information difference between different voltage data sequences. The calculation result of relative entropy can be directly used as an important basis for transformer gear adjustment. Through digital analysis methods, power operation and maintenance personnel can get rid of the previous extensive experience judgment mode and implement gear adjustment operations based on scientific and accurate data support. This not only greatly improves the accuracy and effectiveness of gear adjustment, reduces the potential risks and adverse effects that may be caused by blind adjustment, but also helps to stabilize the voltage quality of the entire substation, ensure that power users can continue to obtain stable and qualified power supply, and further promote the power system towards intelligent and refined management.

[0117] Gear adjustment method:

[0118] 1. The method of adjusting the transformer tap position in the area where the user voltage exceeds the upper limit:

[0119] 1) For the areas where the user voltage exceeds the upper limit, calculate the maximum value of the voltage difference of each area where the user exceeds the upper limit:

[0120]

[0121] In the formula, The number of areas where the user voltage exceeds the upper limit; For the n The maximum value of the voltage difference that exceeds the upper limit for users in each area; For the n The maximum value of the voltage of all users in a substation area; Rated voltage for users.

[0122] 2) Common gears of transformers in the substation area include three gears of (10000±5%) / 400V and five gears of (10000±2×2.5%) / 400V. Calculate the gear that the transformer in the substation area should be adjusted.

[0123]

[0124] Where: For the n The gear position that the transformer in each area should be adjusted; For the n The actual voltage on the high-voltage side of each transformer in each substation; For the n The actual voltage on the low-voltage side of each transformer in each substation; For the n The actual current gear position of the transformer in each substation.

[0125] 3) Since the adjustable gear of the transformer in the substation area is not completely consistent with the actual adjustable gear in terms of value, in order to ensure that the voltage of all users in the substation area is qualified, it should be adjusted upward at least Select an adjacent gear.

[0126] 2. Adjustment method of transformer tap position in the area where the user voltage exceeds the lower limit:

[0127] 1) For the areas where the user voltage is below the lower limit, calculate the maximum value of the voltage difference of each area where the user voltage is below the lower limit:

[0128]

[0129] Where: The number of areas where the user voltage exceeds the lower limit; For the n The maximum value of the voltage difference that exceeds the lower limit for users in each area; For the n The minimum voltage of all users in a substation area.

[0130] 2) Calculate the gear position that the transformer in the substation should be adjusted to:

[0131]

[0132] Where: For the n The gear position that the transformer in each area should be adjusted; For the n The actual voltage on the high-voltage side of each transformer in each substation; For the n The actual voltage on the low-voltage side of the transformer in each substation.

[0133] 3) Since the adjustable gear of the transformer in the substation area is not completely consistent with the actual adjustable gear in terms of value, in order to ensure that the voltage of all users in the substation area is qualified, it should be adjusted downward at least Select an adjacent gear.

[0134] The following are the execution steps for a 10kv transformer as a specific embodiment:

[0135] 1. Screening of substations with unqualified user voltage index

[0136] In order to ensure the timeliness of the screening results, the voltage data of the target low-voltage user group in the last three months was selected as the analysis basis, and the voltage data of the target low-voltage user group in the power user electricity consumption information collection system was exported to the database;

[0137] Calculate the voltage index for each user:

[0138]

[0139] Where: i For the i Users; M is the total number of users; For the i Voltage index of each user; For the i The number of users with qualified voltage is in accordance with the national standard "Power Quality Supply Voltage Deviation" (GB / T 12325-2008), 220V single-phase power supply voltage deviation is +7%, -10% of the nominal voltage; For the i The total number of user voltages.

[0140] Screen out the voltage index δ( i )<95% of the users are located in the area that is unqualified.

[0141] (II) Screening out the substations that need to adjust the gear from the substations with unqualified user voltage index

[0142] Export the low-voltage side voltage data of the power meter in the power user power consumption information collection system in the last three months to the database;

[0143] All voltage data are rounded off, rounded up or rounded down;

[0144] Calculate the probability of occurrence of each voltage value at each substation in all substations:

[0145]

[0146] Where: n For the n Areas; T is the total number of areas; j For the j Voltage value; J is the number of different voltage values; For the n The next area j The probability of a voltage value occurring; For the n The next area j The number of voltage values; For the n The total number of all voltages in a zone.

[0147] Calculate the average value of the station area's gate voltage:

[0148] Where: For the n The average voltage of each area; For the n The next area j A voltage value.

[0149] Calculate the variance of the voltage in each station area,

[0150]

[0151] In the formula, For the n The variance of the voltage in each area.

[0152] The reference substation of each 10kV distribution network power supply line is selected in turn for calculating the relative entropy. The selection basis of the reference substation is that the voltage variance of this substation under this 10kV power supply line is the smallest and the voltage index of all users in this substation is 100%.

[0153] The relative entropy between the substation with unqualified user voltage index and the reference substation under each 10kV distribution network power supply line is calculated in turn:

[0154]

[0155] Where: For the n The relative entropy between the station area and the reference station area; For reference area j The probability of a voltage value occurring.

[0156] Screening out relative entropy from substations with unqualified user voltage index <0.5 and variance The area with a gear ratio of <15 is the area that needs to adjust the gear position.

[0157] (III) Method for adjusting the tap position of transformer in the area where the user voltage exceeds the upper limit

[0158] For the areas where the user voltage exceeds the upper limit, calculate the maximum value of the voltage difference of each area where the user exceeds the upper limit:

[0159]

[0160] In the formula, The number of areas where the user voltage exceeds the upper limit; For the n The maximum value of the voltage difference that exceeds the upper limit for users in each area; For the n The maximum value of the voltage of all users in a substation area; Rated voltage for users.

[0161] Common gears for transformers in the substation include three gears of (10000±5%) / 400V and five gears of (10000±2×2.5%) / 400V. Calculate the gear that the transformer in the substation should be adjusted:

[0162]

[0163] Where: For the n The gear position that the transformer in each area should be adjusted; For the n The actual voltage on the high-voltage side of each transformer in each substation; For the n The actual voltage on the low-voltage side of each transformer in each substation; For the n The actual current gear position of the transformer in each substation.

[0164] Since the adjustable gear of the transformer in the substation area is not completely consistent with the actual adjustable gear in terms of value, in order to ensure that the voltage of all users in the substation area is qualified, it should be adjusted upward at least Select an adjacent gear.

[0165] (IV) Method for adjusting the tap position of transformer in the area where the user voltage exceeds the lower limit

[0166] For the areas where the user voltage is below the lower limit, calculate the maximum value of the voltage difference of each area where the user voltage is below the lower limit:

[0167]

[0168] Where: The number of areas where the user voltage exceeds the lower limit; For the n The maximum value of the voltage difference that exceeds the lower limit for users in each area; For the n The minimum voltage of all users in a substation area.

[0169] Common gears of transformers in the substation area include three gears of (10000±5%) / 400V and five gears of (10000±2×2.5%) / 400V. Calculate the gear that the transformer in the substation area should be adjusted;

[0170]

[0171] Where: For the n The gear position that the transformer in each area should be adjusted; For the n The actual voltage on the high-voltage side of each transformer in each substation; For the n The actual voltage on the low-voltage side of the transformer in each substation.

[0172] 3) Since the adjustable gear of the transformer in the substation area is not completely consistent with the actual adjustable gear in terms of value, in order to ensure that the voltage of all users in the substation area is qualified, it should be adjusted downward at least Select an adjacent gear.

[0173] Based on the method of the present invention, the embodiment of the present disclosure also provides a system corresponding to the above method, which includes:

[0174] Data acquisition module, used to obtain voltage data of the target low-voltage user group

[0175] An unqualified area screening module is used to screen out the areas where users with a voltage index lower than a threshold value belong from all areas based on the user meter voltage data as unqualified areas;

[0176] The reference substation screening module is used to calculate the probability of occurrence of each voltage value at each substation gateway in all substations; the average value of the substation gateway voltage is calculated based on the probability of occurrence of each voltage value at each substation gateway in all substations, and the variance of each substation voltage is calculated based on the average value of the substation gateway voltage; the substation with the smallest variance of the substation voltage and a voltage index of 100% for all users is selected as the reference substation under the current power supply line;

[0177] A calculation module, used for calculating the relative entropy between the substation with unqualified user voltage index and the reference substation under each power supply line in turn based on the probability of occurrence of each voltage value at each substation gateway in all substations;

[0178] A screening module is used to screen out the unqualified areas whose relative entropy and variance are both less than the threshold value as the areas that need to adjust the gear position;

[0179] The adjustment module is used to adjust the gear of the transformer in the substation where the gear adjustment is required, so that the user voltage is maintained at a reasonable value.

[0180] Based on the same inventive concept as the above disclosed content, an embodiment of the present disclosure also provides a device corresponding to the above method, which includes at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the above method.

[0181] It should be noted that the electrical connection between the above-mentioned units does not necessarily mean the connection between lines. An indirect connection method can be applied to the embodiments of the present disclosure as long as the purpose of the present disclosure is achieved.

[0182] Based on the same inventive concept, the present disclosure also provides a computer storage medium on which executable instructions are stored. When the instructions are executed by a processor, the processor performs the above method.

[0183] Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. A transformer gear adjustment method, characterized in that: include: Obtain voltage data of the target low-voltage user group; Based on the user meter voltage data, the user areas with user voltage index lower than the threshold are screened out from all the areas as unqualified areas; the user voltage index is calculated as follows: Where: i For the i Users; M is the total number of users; For the i User voltage index for each user; For the i The number of qualified user voltages, For the i The total number of user voltages; Calculate the probability of occurrence of each voltage value at each substation gateway in all substations; The average value of the voltage at the gateway of each substation in all substations is calculated based on the probability of occurrence of each voltage value at the gateway of each substation, and the variance of the voltage of each substation is calculated based on the average value of the voltage at the gateway of the substation; under each power supply line, the substation with the smallest variance of the substation voltage and a voltage index of 100% for all users is selected as the reference substation under the current power supply line; Based on the probability of occurrence of each voltage value at each gateway in all substations, the relative entropy between the substation with unqualified user voltage index and the reference substation under each power supply line is calculated in turn; Screen out the unqualified areas whose relative entropy and variance are both less than the threshold value as the areas that need to adjust the gear position; Adjust the gear of the transformer in the substation where the gear adjustment is required so that the user voltage is maintained at a reasonable value.

2. A transformer gear adjustment method according to claim 1, characterized in that: The calculation of the probability of occurrence of each voltage value at each area gateway in all areas includes: Round off all voltage data; The rounded voltage data is used to calculate the probability of occurrence of each voltage value at each substation in all substations: Where: n For the n Areas; T is the total number of areas; j For the j Voltage value; J is the number of different voltage values; For the n The next area j The probability of a voltage value occurring; For the n The next area j The number of voltage values; For the n The total number of all voltages in a zone.

3. A transformer gear adjustment method according to claim 2, characterized in that: The calculating the average value of the voltage at each gateway of each substation based on the probability of occurrence of each voltage value at each gateway of all substations includes: Where: For the n The average voltage of each area; For the n The next area j A voltage value.

4. A transformer gear adjustment method according to claim 3, characterized in that: The calculation of the variance of each substation voltage based on the average value of the substation gateway voltage includes: In the formula, For the n The variance of the voltage in each area.

5. The method for adjusting the gear position of a transformer according to claim 1, characterized in that: The relative entropy is calculated as: Where: For the n The relative entropy between the station area and the reference station area; For reference area j The probability of a voltage value occurring; J is the number of different voltage values; T The total number of areas.

6. The method for adjusting the gear position of a transformer according to claim 1, characterized in that: The step of adjusting the gear position of the transformer in the substation area where the gear position needs to be adjusted so that the user voltage is maintained at a reasonable value includes: For the areas where the user voltage exceeds the limit, the maximum value of the user voltage difference exceeding the limit in each area is calculated respectively; The adjustment gear of the transformer in the substation is calculated based on the maximum value of the over-limit voltage difference of the users in each substation, and the gear of the transformer in the substation is adjusted to maintain the user voltage at a reasonable value.

7. A transformer gear adjustment method according to claim 6, characterized in that: The calculation of the maximum value of the over-limit voltage difference of each user in each substation area includes: For the area where the user voltage exceeds the upper limit, the maximum value of the voltage difference of each area where the user exceeds the upper limit is: In the formula, The number of areas where the user voltage exceeds the upper limit; For the n The maximum value of the voltage difference that exceeds the upper limit for users in each area; For the n The maximum value of the voltage of all users in a substation area; Rated voltage for users.

8. The method for adjusting the gear position of a transformer according to claim 7, characterized in that: The step of calculating the adjustable gear of the transformer in the substation area based on the maximum value of the over-limit voltage difference of each substation area user includes: For areas where the user voltage exceeds the upper limit, the gear should be adjusted to: Where: For the n The gear position that the transformer in each area should be adjusted; For the n The actual voltage on the high-voltage side of each transformer in each substation; For the n The actual voltage on the low-voltage side of each transformer in each substation; For the n The actual current gear position of the transformer in each substation.

9. The method for adjusting the gear position of a transformer according to claim 6, characterized in that: The calculation of the maximum value of the over-limit voltage difference of each user in each substation area includes: For the area where the user voltage is lower than the lower limit, the maximum value of the voltage difference of each area where the user voltage is lower than the lower limit is: In the formula, The number of areas where the user voltage exceeds the lower limit; For the n The maximum value of the voltage difference that exceeds the lower limit for users in each area; For the n The minimum voltage of all users in a substation area.

10. The method for adjusting the gear position of a transformer according to claim 9, characterized in that: The step of calculating the adjustable gear of the transformer in the substation area based on the maximum value of the over-limit voltage difference of each substation area user includes: For the area where the user voltage exceeds the lower limit, the gear should be adjusted to: Where: For the n The gear position that the transformer in each area should be adjusted; For the n The actual voltage on the high-voltage side of each transformer in each substation; For the n The actual voltage on the low-voltage side of the transformer in each substation.

11. The method for adjusting the gear position of a transformer according to claim 6, characterized in that: The step-up adjustment of the transformer in the substation area is performed so that the voltage for users is maintained at a reasonable value; When the transformer's adjustable gear position does not match the actual adjustable gear position in value: If the user voltage exceeds the upper limit, adjust the transformer to a level difference not less than A higher gear; If the user voltage exceeds the lower limit, adjust the transformer to a level difference not less than lower gear.

12. The method for adjusting the gear position of a transformer according to claim 1, characterized in that: The user meter voltage data of the target low-voltage user group is the voltage data of the target low-voltage user group in the latest three months.

13. A transformer gear adjustment system, characterized in that: include: Data acquisition module, used to obtain voltage data of the target low-voltage user group An unqualified area screening module is used to screen out the areas where users with a voltage index lower than a threshold value belong from all areas based on the user meter voltage data as unqualified areas; The user voltage index is calculated as: Where: i For the i Users; M is the total number of users; For the i User voltage index for each user; For the i The number of qualified user voltages, For the i The total number of user voltages; The reference area screening module is used to calculate the probability of occurrence of each voltage value at each area gate in all areas; The average value of the voltage at the gateway of each substation in all substations is calculated based on the probability of occurrence of each voltage value at the gateway of each substation, and the variance of the voltage of each substation is calculated based on the average value of the voltage at the gateway of the substation; under each power supply line, the substation with the smallest variance of the substation voltage and a voltage index of 100% for all users is selected as the reference substation under the current power supply line; A calculation module, used for calculating the relative entropy between the substation with unqualified user voltage index and the reference substation under each power supply line in turn based on the probability of occurrence of each voltage value at each substation gateway in all substations; A screening module is used to screen out the unqualified areas whose relative entropy and variance are both less than the threshold value as the areas that need to adjust the gear position; The adjustment module is used to adjust the gear of the transformer in the substation where the gear adjustment is required, so that the user voltage is maintained at a reasonable value.

14. A transformer gear adjustment device, comprising: at least one processor; And a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the transformer gear adjustment method described in any one of claims 1 to 12.

15. A computer storage medium having executable instructions stored thereon, wherein when the instructions are executed by a processor, the processor is enabled to implement the method according to any one of claims 1 to 12.

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