A compensating type neutral line regulating step-down transformer

Abstract

The present invention relates to the technical field of step-down transformers, and discloses a compensated neutral line regulating step-down transformer, comprising: a step-down transformer body, a neutral line, and a compensation control module; a judgment unit is configured to judge whether to compensate the step-down transformer body based on a first voltage value; a compensation unit is configured to compensate the step-down transformer body according to a compensation scheme; a verification unit is configured to verify the compensation scheme based on a second voltage value and determine a verification result; judge whether to perform secondary compensation on the step-down transformer body according to the verification result; a secondary compensation unit is configured to compare a compensation influence index with historical data, determine a secondary compensation scheme according to the comparison result, and perform secondary compensation on the step-down transformer body according to the secondary compensation scheme; a storage unit is configured to store the compensation influence index. The present invention effectively balances the load of the power system and improves the power supply quality and stability.

Description

Technical Field

[0001] The present invention relates to the technical field of step-down transformers, and more particularly, to a compensated neutral line regulating step-down transformer. Background Art

[0002] In the power system, step-down transformers play a crucial role. They are mainly responsible for converting high voltage into low voltage to ensure that various electrical devices can obtain the appropriate voltage level for their operation. This conversion is essential for power distribution and use because different electrical appliances and devices have different voltage requirements. However, in traditional step-down transformer designs, there is a common problem that when the current in the neutral line (midline) is unbalanced, it may cause voltage instability and fluctuations. Such voltage instability and fluctuations will have a negative impact on the electrical devices connected to the transformer, resulting in abnormal operation of the devices and even possible damage to the devices.

[0003] Therefore, it is necessary to design a compensated neutral line regulating step-down transformer to solve the problems existing in the current technology. Summary of the Invention

[0004] In view of this, the present invention provides a compensated neutral line regulating step-down transformer, aiming to solve the problem that the voltage instability and fluctuations in the current technology will have a negative impact on the electrical devices connected to the transformer, resulting in abnormal operation of the devices and even possible damage to the devices.

[0005] The present invention provides a compensated neutral line regulating step-down transformer, comprising:

[0006] A step-down transformer body, a neutral line, and a compensation control module; the step-down transformer body includes an iron core, a primary winding, and a secondary winding, the primary winding is located on one side of the iron core, and the secondary winding is located on the other side of the iron core; the neutral line is connected to the neutral point of the step-down transformer body; the compensation control module is connected to the step-down transformer body and the neutral line, and the compensation control module includes a judgment unit, a compensation unit, a verification unit, a secondary compensation unit, and a storage unit;

[0007] The judgment unit is configured to collect a first voltage value of the neutral point and determine whether to compensate the step-down transformer body based on the first voltage value;

[0008] The compensation unit is configured to, when it is determined to compensate the step-down transformer body, collect real-time operation data of the step-down transformer body, determine a compensation scheme according to the real-time operation data, and compensate the step-down transformer body according to the compensation scheme;

[0009] The verification unit is configured to collect a second voltage value of the neutral point after compensation, verify the compensation scheme based on the second voltage value, and determine a verification result; and determine whether to perform secondary compensation on the step-down transformer body according to the verification result;

[0010] The secondary compensation unit is configured to, when it is determined to perform secondary compensation on the step-down transformer body, collect the load unbalance degree of the step-down transformer body and the line impedance data of the neutral line, and calculate a compensation influence index based on the load unbalance degree and the line impedance data; compare the compensation influence index with historical data, determine a secondary compensation scheme according to the comparison result, and perform secondary compensation on the step-down transformer body according to the secondary compensation scheme;

[0011] The storage unit is configured to store the compensation influence index.

[0012] Further, when determining whether to perform compensation on the step-down transformer body based on the first voltage value, it includes:

[0013] Compare the first voltage value with a voltage threshold, and determine whether to perform compensation on the step-down transformer body according to the comparison result;

[0014] When the first voltage value is less than or equal to the voltage threshold, it is determined not to perform compensation on the step-down transformer body;

[0015] When the first voltage value is greater than the voltage threshold, it is determined to perform compensation on the step-down transformer body.

[0016] Further, when determining a compensation scheme according to the real-time operation data, it includes:

[0017] The real-time operation data includes: real-time current value, real-time voltage value, real-time power factor, real-time active power, and real-time reactive power;

[0018] Determine an operation deviation coefficient according to the real-time operation data, and determine the compensation scheme according to the operation deviation coefficient;

[0019] The operation deviation coefficient is obtained by the following formula:

[0020]

[0021] Wherein, ODC represents the operation deviation coefficient; I represents the real-time current value; Ir represents the rated current value; V represents the real-time voltage value, Vr represents the rated voltage value; PF represents the real-time power factor; PFr represents the rated power factor; P represents the real-time active power; Sr represents the rated apparent power; Q represents the real-time reactive power; α, β, γ, δ, and ∈ represent weight factors, and α + β + γ + δ + ∈ = 1.

[0022] Further, when determining the compensation scheme according to the operation offset coefficient, it includes:

[0023] Comparing the operation offset coefficient with a first operation offset coefficient and a second operation offset coefficient, and determining the compensation scheme according to the comparison result; wherein, the first operation offset coefficient is less than the second operation offset coefficient;

[0024] When the operation offset coefficient is less than or equal to the first operation offset coefficient, determining the compensation scheme as a first compensation scheme;

[0025] When the operation offset coefficient is greater than the first operation offset coefficient and less than or equal to the second operation offset coefficient, determining the compensation scheme as a second compensation scheme;

[0026] When the operation offset coefficient is greater than the second operation offset coefficient, determining the compensation scheme as a third compensation scheme.

[0027] Further, when verifying the compensation scheme based on the second voltage value and determining the verification result, it includes:

[0028] Subtracting the first voltage value from the second voltage value to obtain a voltage difference;

[0029] Comparing the voltage difference with a voltage difference threshold, and verifying the compensation scheme according to the comparison result;

[0030] When the voltage difference is less than the voltage difference threshold, verifying that the compensation scheme is invalid;

[0031] When the voltage difference is greater than or equal to the voltage difference threshold, verifying that the compensation scheme is valid;

[0032] When verifying that the compensation scheme is invalid, directly determining to perform secondary compensation on the step-down transformer body;

[0033] When verifying that the compensation scheme is valid, comparing the second voltage value with a voltage threshold, and determining the verification result according to the comparison result;

[0034] When the second voltage value is less than or equal to the voltage threshold, determining the verification result as successful compensation;

[0035] When the second voltage value is greater than the voltage threshold, determining the verification result as failed compensation.

[0036] Further, when judging whether to perform secondary compensation on the step-down transformer body according to the verification result, it includes:

[0037] When the verification result is compensation failure, it is determined to perform secondary compensation on the step-down transformer body;

[0038] When the verification result is compensation success, it is determined not to perform secondary compensation on the step-down transformer body.

[0039] Further, when calculating the compensation influence index based on the load unbalance degree and line impedance data, it includes:

[0040] The compensation influence index is obtained by the following formula:

[0041]

[0042] Wherein, CI represents the compensation influence index; LUI represents the load unbalance degree; LUImax represents the maximum allowable value of the load unbalance degree; Zline represents the line impedance value; Zlinemax represents the maximum allowable value of the line impedance; ω1, ω2 represent influence coefficients, and ω1 + ω2 = 1.

[0043] Further, when comparing the compensation influence index with historical data and determining the secondary compensation plan according to the comparison result, it includes:

[0044] When there is a historical compensation influence index in the historical data that is the same as the compensation influence index, perform secondary compensation on the step-down transformer body according to the secondary compensation plan corresponding to the historical compensation influence index;

[0045] When there is a historical compensation influence index in the historical data that is the same as the compensation influence index, calculate the similarity between the compensation influence index and the historical data, obtain the secondary compensation plan according to the similarity, and perform secondary compensation on the step-down transformer body according to the secondary compensation plan.

[0046] Further, when obtaining the secondary compensation plan according to the similarity and performing secondary compensation on the step-down transformer body according to the secondary compensation plan, it includes:

[0047] The similarity is obtained by the following formula:

[0048]

[0049] Wherein, Si represents the similarity; CI represents the compensation influence index; Cih i represents the i-th historical compensation influence index in the historical data; σ represents the standard deviation of all historical compensation influence indexes in the historical data.

[0050] Further, when obtaining the secondary compensation plan according to the similarity and performing secondary compensation on the step-down transformer body according to the secondary compensation plan, it also includes:

[0051] Obtain the maximum value of the similarity, denoted as the maximum similarity;

[0052] Compare the maximum similarity with the first maximum similarity and the second maximum similarity, and determine the secondary compensation scheme according to the comparison result; wherein, the first maximum similarity is less than the second maximum similarity;

[0053] When the maximum similarity is less than or equal to the first maximum similarity, determine the secondary compensation scheme as the first secondary compensation scheme;

[0054] When the maximum similarity is greater than the first maximum similarity and less than or equal to the second maximum similarity, determine the secondary compensation scheme as the second secondary compensation scheme;

[0055] When the maximum similarity is greater than the second maximum similarity, determine the secondary compensation scheme as the third secondary compensation scheme.

[0056] Compared with the prior art, the beneficial effects of the present invention are as follows: The compensated neutral line regulating step-down transformer provided by the present invention can quickly respond to load changes through real-time monitoring and intelligent compensation, effectively balance the load of the power system, and improve the power supply quality and stability. Through the cooperation of each unit in the compensation control module, precise compensation and verification of the step-down transformer body are achieved, and power failures and potential safety hazards caused by improper compensation are avoided to the greatest extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present invention. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0058] Figure 1 is the structural block diagram of the compensated neutral line regulating step-down transformer provided by the embodiment of the present invention;

[0059] Figure 2 is the structural schematic diagram of the step-down transformer body of the compensated neutral line regulating step-down transformer provided by the embodiment of the present invention;

[0060] Figure 3 is the structural schematic diagram of the compensated neutral line regulating step-down transformer provided by the embodiment of the present invention.

[0061] In the figure: 101, iron core; 102, primary winding; 103, secondary winding. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0062] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be fully conveyed to those skilled in the art. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0063] Referring to Figure 1 As shown, in some embodiments of the present application, this embodiment provides a compensated neutral line regulating step-down transformer, including:

[0064] A step-down transformer body, a neutral line, and a compensation control module; the step-down transformer body includes an iron core 101, a primary winding 102, and a secondary winding 103. The primary winding 102 is located on one side of the iron core 101, and the secondary winding 103 is located on the other side of the iron core 101; the neutral line is connected to the neutral point of the step-down transformer body; the compensation control module is connected to the step-down transformer body and the neutral line, and the compensation control module includes a judgment unit, a compensation unit, a verification unit, a secondary compensation unit, and a storage unit;

[0065] The judgment unit is configured to collect a first voltage value of the neutral point and determine whether to compensate the step-down transformer body based on the first voltage value;

[0066] The compensation unit is configured to, when it is determined to compensate the step-down transformer body, collect real-time operation data of the step-down transformer body, determine a compensation scheme according to the real-time operation data, and compensate the step-down transformer body according to the compensation scheme;

[0067] The verification unit is configured to collect a second voltage value of the neutral point after compensation, verify the compensation scheme based on the second voltage value, and determine a verification result; determine whether to perform secondary compensation on the step-down transformer body according to the verification result;

[0068] The secondary compensation unit is configured to, when it is determined to perform secondary compensation on the step-down transformer body, collect the load unbalance degree of the step-down transformer body and the line impedance data of the neutral line, and calculate a compensation influence index based on the load unbalance degree and the line impedance data; compare the compensation influence index with historical data, determine a secondary compensation scheme according to the comparison result, and perform secondary compensation on the step-down transformer body according to the secondary compensation scheme;

[0069] The storage unit is configured to store the compensation impact index.

[0070] It can be seen that the compensated neutral line regulating step-down transformer provided in this embodiment realizes intelligent compensation for the step-down transformer body through the compensation control module. First, the judgment unit can collect the voltage value of the neutral point in real time and compare it with a preset voltage threshold to determine whether compensation is required for the step-down transformer body. When compensation is required, the compensation unit will further collect the real-time operation data of the step-down transformer body, such as real-time current value, real-time voltage value, real-time power factor, real-time active power, and real-time reactive power, etc., and determine a compensation plan based on these data. After the compensation plan is determined, the compensation unit will compensate the step-down transformer body according to this plan to improve the unbalanced condition of the power load. After the initial compensation is completed, the verification unit will collect the voltage value of the neutral point after compensation and compare it with the voltage value before compensation to verify the effectiveness of the compensation plan. If the verification result shows that the compensation plan is invalid or the compensation effect is not ideal, then the secondary compensation unit will be activated to further collect the load imbalance degree of the step-down transformer body and the line impedance data of the neutral line, calculate the compensation impact index, and compare it with the historical data to determine a more accurate secondary compensation plan. Finally, the step-down transformer body is secondarily compensated according to the determined secondary compensation plan to achieve a better power load balance effect. This compensated neutral line regulating step-down transformer also stores the compensation impact index through the storage unit to provide a reference for subsequent compensation operations. This improves the accuracy and efficiency of compensation.

[0071] It can be understood that the compensated neutral line regulating step-down transformer provided in this embodiment can quickly respond to load changes, effectively balance the load of the power system, and improve the power supply quality and stability through real-time monitoring and intelligent compensation. Through the cooperation of each unit in the compensation control module, precise compensation and verification of the step-down transformer body are achieved, and power failures and safety hazards caused by improper compensation are avoided to the greatest extent.

[0072] Specifically, when determining whether to compensate the step-down transformer body based on the first voltage value, it includes:

[0073] Compare the first voltage value with the voltage threshold, and determine whether to compensate the step-down transformer body according to the comparison result;

[0074] When the first voltage value is less than or equal to the voltage threshold, it is determined that the step-down transformer body is not compensated;

[0075] When the first voltage value is greater than the voltage threshold, it is determined that the step-down transformer body is compensated.

[0076] It can be understood that the voltage threshold is preset according to the actual situation of the power system and the set safety standards. When the first voltage value of the neutral point is within the normal range or at a lower level, it indicates that the load of the power system is relatively balanced, and there is no need to compensate the main body of the step-down transformer at this time. When the first voltage value exceeds the voltage threshold, it indicates that there is a load imbalance in the power system, and compensation is required to adjust the distribution of the power load. This judgment method based on the voltage value is simple and effective, and can realize the real-time monitoring and rapid response of the load status of the power system.

[0077] Specifically, when determining the compensation scheme according to the real-time operation data, it includes:

[0078] The real-time operation data includes: real-time current value, real-time voltage value, real-time power factor, real-time active power, and real-time reactive power;

[0079] Determine the operation deviation coefficient according to the real-time operation data, and determine the compensation scheme according to the operation deviation coefficient;

[0080] The operation deviation coefficient is obtained by the following formula:

[0081]

[0082] Wherein, ODC represents the operation deviation coefficient; I represents the real-time current value; Ir represents the rated current value; V represents the real-time voltage value, Vr represents the rated voltage value; PF represents the real-time power factor; PFr represents the rated power factor; P represents the real-time active power; Sr represents the rated apparent power; Q represents the real-time reactive power; α, β, γ, δ, and ∈ represent weight factors, and α + β + γ + δ + ∈ = 1.

[0083] It can be understood that the operation deviation coefficient ODC is an index comprehensively reflecting the operation state of the main body of the step-down transformer. It is obtained by weighted average calculation of key operation data such as real-time current value, real-time voltage value, real-time power factor, real-time active power, and real-time reactive power. In the calculation process, the weight factors α, β, γ, δ, and ∈ of each parameter are set according to their influence degree on the power load balance, and the sum of these weight factors is equal to 1, ensuring the accuracy and rationality of the calculation of the operation deviation coefficient. The magnitude of the operation deviation coefficient directly reflects the deviation degree of the current operation state of the main body of the step-down transformer from the ideal state. When the operation deviation coefficient is large, it indicates that the operation state of the main body of the step-down transformer is poor, and compensation is required to adjust the distribution of the power load.

[0084] Specifically, when determining the compensation scheme according to the operation deviation coefficient, it includes:

[0085] Compare the operating offset coefficient with the first operating offset coefficient and the second operating offset coefficient, and determine the compensation scheme according to the comparison result; wherein, the first operating offset coefficient is less than the second operating offset coefficient;

[0086] When the operating offset coefficient is less than or equal to the first operating offset coefficient, determine that the compensation scheme is the first compensation scheme;

[0087] When the operating offset coefficient is greater than the first operating offset coefficient and less than or equal to the second operating offset coefficient, determine that the compensation scheme is the second compensation scheme;

[0088] When the operating offset coefficient is greater than the second operating offset coefficient, determine that the compensation scheme is the third compensation scheme.

[0089] It can be understood that different compensation schemes correspond to different compensation degrees and methods. The first compensation scheme is a relatively mild compensation method, which is applicable to the situation where the operating state of the step-down transformer body deviates from the ideal state not too seriously. At this time, the compensation unit will take some basic compensation measures, such as fine-tuning the voltage or current, etc., to improve the imbalance of the power load. The second compensation scheme is a more intense compensation method, which is applicable to the situation where the operating state of the step-down transformer body deviates from the ideal state more seriously. At this time, the compensation unit will take more active compensation measures, such as increasing or decreasing the capacity of the compensation capacitor, etc., to adjust the distribution of the power load faster. The third compensation scheme is a more complex and refined compensation method, which is applicable to the situation where the operating state of the step-down transformer body seriously deviates from the ideal state. At this time, the compensation unit will take more complex and refined compensation measures, such as dynamically adjusting the capacity and combination of the compensation capacitor, and adjusting the tap position of the transformer, etc., to achieve precise adjustment of the power load distribution.

[0090] Specifically, when verifying the compensation scheme based on the second voltage value and determining the verification result, it includes:

[0091] Subtract the first voltage value from the second voltage value to obtain a voltage difference;

[0092] Compare the voltage difference with the voltage difference threshold, and verify the compensation scheme according to the comparison result;

[0093] When the voltage difference is less than the voltage difference threshold, verify that the compensation scheme is invalid;

[0094] When the voltage difference is greater than or equal to the voltage difference threshold, verify that the compensation scheme is valid;

[0095] When it is verified that the compensation scheme is invalid, directly determine to perform secondary compensation on the step-down transformer body;

[0096] When it is verified that the compensation scheme is effective, compare the second voltage value with the voltage threshold, and determine the verification result according to the comparison result;

[0097] When the second voltage value is less than or equal to the voltage threshold, determine that the verification result is successful compensation;

[0098] When the second voltage value is greater than the voltage threshold, determine that the verification result is failed compensation.

[0099] It can be understood that the verification process of the compensation scheme is the evaluation and confirmation of the preliminary compensation effect. By calculating the difference between the neutral point voltage value after compensation and the voltage value before compensation, and comparing it with the set voltage difference threshold, it can be initially judged whether the compensation scheme is effective. If the voltage difference is small and lower than the voltage difference threshold, it means that the compensation effect is not significant. At this time, the secondary compensation program needs to be directly started to further optimize the balance state of the power load. If the voltage difference is large and reaches or exceeds the voltage difference threshold, it is initially considered that the compensation scheme is effective, but further verification is still needed. At this time, the neutral point voltage value after compensation will be compared with the voltage threshold to determine the final verification result. If the voltage value after compensation can be reduced below the voltage threshold, it means that the compensation is successful and the load balance state of the power system has been effectively improved. If the voltage value after compensation is still higher than the voltage threshold, it means that although the compensation scheme has played a certain role, it has not completely solved the problem of load imbalance. At this time, the compensation scheme needs to be adjusted or other measures need to be taken for further compensation.

[0100] Specifically, when judging whether to perform secondary compensation on the step-down transformer body according to the verification result, it includes:

[0101] When the verification result is failed compensation, determine to perform secondary compensation on the step-down transformer body;

[0102] When the verification result is successful compensation, determine not to perform secondary compensation on the step-down transformer body.

[0103] It can be understood that the decision on whether to perform secondary compensation on the step-down transformer body based on the verification result is an important link in the intelligent compensation process. When the verification result shows that the compensation scheme fails to achieve the expected effect, that is, the compensation fails, the system will immediately start the secondary compensation program to more precisely adjust the distribution of the power load.

[0104] Specifically, when calculating the compensation influence index based on the load imbalance degree and line impedance data, it includes:

[0105] The compensation impact index is obtained through the following formula:

[0106]

[0107] where CI represents the compensation impact index; LUI represents the load unbalance degree; LUImax represents the maximum allowable value of the load unbalance degree; Zline represents the line impedance value; Zlinemax represents the maximum allowable value of the line impedance; ω1 and ω2 represent impact coefficients, and ω1 + ω2 = 1.

[0108] In this embodiment, the load unbalance degree is obtained by acquiring the real-time load data of each phase and then calculating the difference or ratio between the loads of each phase. The larger the value of the load unbalance degree, the more uneven the load distribution of the power system, and the greater the threat to the stability and security of the power system. The line impedance refers to the hindrance of the transmission line in the power system to the current, and the magnitude of the line impedance is related to factors such as the length, material, and cross-sectional area of the line. The larger the value of the line impedance, the stronger the hindrance of the transmission line to the current, and the corresponding reduction in the power transmission efficiency.

[0109] It can be understood that the compensation impact index CI is obtained by weighted average calculation of the two key parameters of the load unbalance degree LUI and the line impedance Zline. In the calculation process, the weight factors ω1 and ω2 of each parameter are set according to their influence degree on the power load balance, and the sum of these weight factors is equal to 1, ensuring the accuracy and rationality of the calculation of the compensation impact index.

[0110] Specifically, when comparing the compensation impact index with historical data and determining the secondary compensation scheme according to the comparison result, it includes:

[0111] When there is a historical compensation impact index in the historical data that is the same as the compensation impact index, perform secondary compensation on the step-down transformer body according to the secondary compensation scheme corresponding to the historical compensation impact index;

[0112] When there is a historical compensation impact index in the historical data that is the same as the compensation impact index, calculate the similarity between the compensation impact index and the historical data, obtain the secondary compensation scheme according to the similarity, and perform secondary compensation on the step-down transformer body according to the secondary compensation scheme.

[0113] It can be understood that by comparing the compensation impact index with historical data, past experience and data can be fully utilized to provide a more accurate and reliable reference for current compensation operations. When there is a historical record in the historical data that is exactly the same as the current compensation impact index, the secondary compensation plan corresponding to this historical record can be directly adopted, which can greatly improve the efficiency and accuracy of compensation. When there is no historical record in the historical data that is exactly the same as the current compensation impact index, the similarity between the current compensation impact index and the historical data can be calculated to find the closest historical compensation plan, and appropriate adjustments can be made according to this plan to obtain a secondary compensation plan suitable for the current situation. This method based on the comparison and similarity calculation of historical data can achieve more precise and personalized compensation for the step-down transformer body, further improving the load balancing effect and power supply quality of the power system.

[0114] Specifically, when obtaining the secondary compensation plan according to the similarity and performing secondary compensation on the step-down transformer body according to the secondary compensation plan, it includes:

[0115] The similarity is obtained through the following formula:

[0116]

[0117] Where, S i represents the similarity; CI represents the compensation impact index; CI h i represents the i-th historical compensation impact index in the historical data; σ represents the standard deviation of all historical compensation impact indexes in the historical data.

[0118] It can be understood that the similarity S i is an index reflecting the degree of closeness between the current compensation impact index and each historical compensation impact index in the historical data. The larger the value of the similarity S i, the closer the current compensation impact index is to a certain historical compensation impact index in the historical data. After determining the similarity, the secondary compensation plan can be determined according to the size of the similarity.

[0119] Specifically, when obtaining the secondary compensation plan according to the similarity and performing secondary compensation on the step-down transformer body according to the secondary compensation plan, it also includes:

[0120] Obtain the maximum value of the similarity, denoted as the maximum similarity;

[0121] Compare the maximum similarity with the first maximum similarity and the second maximum similarity, and determine the secondary compensation plan according to the comparison result; where, the first maximum similarity is less than the second maximum similarity;

[0122] When the maximum similarity is less than or equal to the first maximum similarity, determine the secondary compensation plan as the first secondary compensation plan;

[0123] When the maximum similarity is greater than the first maximum similarity and less than or equal to the second maximum similarity, determine that the secondary compensation scheme is the second secondary compensation scheme;

[0124] When the maximum similarity is greater than the second maximum similarity, determine that the secondary compensation scheme is the third secondary compensation scheme.

[0125] It can be understood that by setting different maximum similarity thresholds, the secondary compensation scheme can be divided into different levels to adapt to the compensation requirements in different situations. The first secondary compensation scheme is a relatively conservative compensation method, applicable to the situation where the maximum similarity is low, that is, the current compensation situation is quite different from the historical data. The first secondary compensation scheme is to gradually adjust the capacity of the compensation capacitor or finely adjust the voltage, etc., to gradually improve the imbalance of the power load. The second secondary compensation scheme is a more moderate compensation method, applicable to the situation where the maximum similarity is at a medium level. The second secondary compensation scheme is preferably to increase or decrease the capacity of the compensation capacitor, or adjust parameters such as voltage and current to achieve the load balance of the power system faster. The third secondary compensation scheme is a more complex and refined compensation method, applicable to the situation where the maximum similarity is high, that is, the current compensation situation is very close to the historical data. The third secondary compensation scheme is preferably to precisely adjust the capacity of the compensation capacitor, optimize the setting of parameters such as voltage and current to achieve a more accurate and efficient power load balance. This method of similarity calculation and scheme optimization based on historical data can make full use of past experience and data, improve the accuracy and efficiency of compensation, and further enhance the stability and power supply quality of the power system.

[0126] Those skilled in the art should understand that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0127] The present application is described with reference to the flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each flow and / or block in the flowchart and / or block diagram can be implemented by computer program instructions, and the combination of flows and / or blocks in the flowchart and / or block diagram can also be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate for implementation in the processFigure 1 one process or multiple processes and / or blocks Figure 1 a device for the functions specified in one block or multiple blocks.

[0128] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured article including an instruction device, and the instruction device implements the processes Figure 1 one process or multiple processes and / or blocks Figure 1 the functions specified in one block or multiple blocks.

[0129] These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process. Thus, the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0130] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: the specific implementation manners of the present invention can still be modified or equivalently replaced, and any modification or equivalent replacement that does not depart from the spirit and scope of the present invention shall be covered by the protection scope of the claims of the present invention.

Claims

1. A compensated neutral line regulating step-down transformer, characterized in that, Including: A step-down transformer body, a neutral line, and a compensation control module; the step-down transformer body includes an iron core, a primary winding, and a secondary winding, the primary winding is located on one side of the iron core, and the secondary winding is located on the other side of the iron core; the neutral line is connected to the neutral point of the step-down transformer body; the compensation control module is connected to the step-down transformer body and the neutral line, and the compensation control module includes a judgment unit, a compensation unit, a verification unit, a secondary compensation unit, and a storage unit; The judgment unit is configured to collect a first voltage value of the neutral point and judge whether to compensate the step-down transformer body based on the first voltage value; The compensation unit is configured to, when it is determined to compensate the step-down transformer body, collect real-time operation data of the step-down transformer body, determine a compensation scheme according to the real-time operation data, and compensate the step-down transformer body according to the compensation scheme; The verification unit is configured to collect a second voltage value of the neutral point after compensation, verify the compensation scheme based on the second voltage value, and determine a verification result; judge whether to perform secondary compensation on the step-down transformer body according to the verification result; The secondary compensation unit is configured to, when it is determined to perform secondary compensation on the step-down transformer body, collect the load unbalance degree of the step-down transformer body and the line impedance data of the neutral line, and calculate a compensation influence index based on the load unbalance degree and the line impedance data; compare the compensation influence index with historical data, determine a secondary compensation scheme according to the comparison result, and perform secondary compensation on the step-down transformer body according to the secondary compensation scheme; The storage unit is configured to store the compensation influence index; When verifying the compensation scheme based on the second voltage value and determining the verification result, it includes: Subtracting the second voltage value from the first voltage value to obtain a voltage difference; Comparing the voltage difference with a voltage difference threshold, and verifying the compensation scheme according to the comparison result; When the voltage difference is less than the voltage difference threshold, verify that the compensation scheme is invalid; When the voltage difference is greater than or equal to the voltage difference threshold, verify that the compensation scheme is valid; When verifying that the compensation scheme is invalid, directly determine to perform secondary compensation on the step-down transformer body; When verifying that the compensation scheme is valid, compare the second voltage value with a voltage threshold, and determine the verification result according to the comparison result; When the second voltage value is less than or equal to the voltage threshold, determine that the verification result is successful compensation; When the second voltage value is greater than the voltage threshold, determine that the verification result is failed compensation.

2. The compensated neutral line regulating step-down transformer according to claim 1, wherein When judging whether to compensate the step-down transformer body based on the first voltage value, it includes: Comparing the first voltage value with a voltage threshold, and judging whether to compensate the step-down transformer body according to the comparison result; When the first voltage value is less than or equal to the voltage threshold, determine not to compensate the step-down transformer body; When the first voltage value is greater than the voltage threshold, it is determined to compensate the step-down transformer body.

3. The compensated neutral line regulating step-down transformer according to claim 1, wherein, When determining the compensation scheme according to the real-time operation data, it includes: The real-time operation data includes: real-time current value, real-time voltage value, real-time power factor, real-time active power, and real-time reactive power; Determine the operation deviation coefficient according to the real-time operation data, and determine the compensation scheme according to the operation deviation coefficient; The operation deviation coefficient is obtained by the following formula: ； Among them, ODC represents the operating offset coefficient; I represents the real-time current value; Ir represents the rated current value; V represents the real-time voltage value, Vr represents the rated voltage value; PF represents the real-time power factor; PFr represents the rated power factor; P represents the real-time active power; Sr represents the rated apparent power; Q represents the real-time reactive power; α, β, γ, δ, and ϵ represent weight factors, and .

4. The compensated neutral line regulating step-down transformer according to claim 3, characterized in that, When determining the compensation scheme according to the operation deviation coefficient, it includes: Compare the operation deviation coefficient with the first operation deviation coefficient and the second operation deviation coefficient, and determine the compensation scheme according to the comparison result; where the first operation deviation coefficient is less than the second operation deviation coefficient; When the operation deviation coefficient is less than or equal to the first operation deviation coefficient, determine that the compensation scheme is the first compensation scheme; When the operation deviation coefficient is greater than the first operation deviation coefficient and less than or equal to the second operation deviation coefficient, determine that the compensation scheme is the second compensation scheme; When the operation deviation coefficient is greater than the second operation deviation coefficient, determine that the compensation scheme is the third compensation scheme.

5. The compensated neutral line regulating step-down transformer according to claim 4, wherein When judging whether to perform secondary compensation on the step-down transformer body according to the verification result, it includes: When the verification result is compensation failure, it is determined to perform secondary compensation on the step-down transformer body; When the verification result is compensation success, it is determined not to perform secondary compensation on the step-down transformer body.

6. The compensated neutral line regulating step-down transformer according to claim 1, characterized in that, When calculating the compensation influence index based on the load imbalance degree and line impedance data, it includes: The compensation influence index is obtained by the following formula: ； Where, CI represents the compensation influence index; LUI represents the load imbalance degree; LUImax represents the maximum allowable value of the load imbalance degree; Zline represents the line impedance value; Zlinemax represents the maximum allowable value of the line impedance; ω1, ω2 represent influence coefficients, and ω1 + ω2 = 1.

7. The compensated neutral line regulating step-down transformer according to claim 6, wherein When comparing the compensation influence index with historical data and determining the secondary compensation scheme according to the comparison result, it includes: When there is a historical compensation influence index in the historical data that is the same as the compensation influence index, perform secondary compensation on the step-down transformer body according to the secondary compensation scheme corresponding to the historical compensation influence index; When there is no historical compensation influence index in the historical data that is the same as the compensation influence index, calculate the similarity between the compensation influence index and the historical data, obtain the secondary compensation scheme according to the similarity, and perform secondary compensation on the step-down transformer body according to the secondary compensation scheme.

8. The compensated neutral line regulating step-down transformer according to claim 7, characterized in that, When obtaining the secondary compensation scheme according to the similarity and performing secondary compensation on the step-down transformer body according to the secondary compensation scheme, it includes: The similarity is obtained by the following formula: ； Where, Si represents the similarity; CI represents the compensation influence index; Cihi represents the i-th historical compensation influence index in the historical data; σ represents the standard deviation of all historical compensation influence indexes in the historical data.

9. The compensated neutral line regulating step-down transformer according to claim 8, characterized in that, When obtaining a secondary compensation scheme based on the similarity and performing secondary compensation on the step-down transformer body according to the secondary compensation scheme, it further includes: Obtaining the maximum value of the similarity, denoted as the maximum similarity; Comparing the maximum similarity with a first maximum similarity and a second maximum similarity, and determining the secondary compensation scheme according to the comparison result; wherein, the first maximum similarity is less than the second maximum similarity; When the maximum similarity is less than or equal to the first maximum similarity, determining the secondary compensation scheme as the first secondary compensation scheme; When the maximum similarity is greater than the first maximum similarity and less than or equal to the second maximum similarity, determining the secondary compensation scheme as the second secondary compensation scheme; When the maximum similarity is greater than the second maximum similarity, determining the secondary compensation scheme as the third secondary compensation scheme.

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