An intelligent identification method for the relationship between power supply stations and users

Abstract

The present invention provides a method for intelligently identifying the relationship between power supply stations and users, which relates to the technical field of power distribution network data analysis, and includes the following steps: collecting the transformer low-voltage side voltage and each user-end voltage at a first time point to calculate a first voltage drop value, and obtain the line impedance of each user-end; collecting the transformer low-voltage side voltage and each user-end voltage at other time points; obtaining a second voltage drop value when the transformer low-voltage side voltage is different from the voltage at the first time point at any time; obtaining a third voltage drop value by using the impedance value and the current value at that time point; performing a consistency comparison between the second voltage drop value and the third voltage drop value to determine the relationship between power supply stations and users. The present invention has the advantages of fast speed and high accuracy in identifying the relationship between power supply stations and users, and does not have the problem of cross-stations. The method further determines the relationship between power supply stations and users by adding a low-frequency signal with a characteristic value to the low-voltage side of the transformer, and comparing the consistency between the low-frequency signal information with the characteristic value received by the user and the low-frequency information sent out.

Description

Technical Field

[0001] The present invention relates to the technical field of distribution network data analysis, and in particular to a method for intelligently identifying the relationship between power supply stations and users in power supply areas. Background Art

[0002] Power supply substations are fundamental components of the power system. Within each substation, a centralized management terminal is installed, hosting numerous electricity users. These terminals regularly collect basic information on user electricity usage, manage substation line losses, and collect information on electricity usage after load cutovers. However, as load increases and grid transformations progress, electricity users often shift between adjacent substations. Over time, this can lead to unclear relationships between substations and users, complicating both electricity usage information management and substation line loss management. Therefore, a suitable method is needed to identify and clarify these relationships.

[0003] There are many existing methods for identifying the relationship between transformers and users. For example, patent application number 202010859248.9 mainly identifies the relationship between transformers and users by comparing the characteristic values and correlations of the distribution transformer outlet voltage and the user-end voltage. Although this can solve certain problems, there is a problem that the voltage change trends on the low-voltage side of the transformers connected to the same high-voltage bus are the same, which can easily lead to misjudgment. For example, patent application number 202010805583.0 uses successful data such as total power consumption, daily line loss, and daily meter reading within a year to compare and analyze the relationship between transformers and users. This will result in large identification errors for situations with large load fluctuations and annual power consumption changes, and will lead to misjudgment of household-transformer relationships. For example, patent application number 202110036858.3 identifies household-transformer relationships by analyzing the zero-crossing data series obtained at the zero-crossing moment of the power frequency voltage and current signals. This method has the problem of not being able to accurately identify under abnormal line conditions or system imbalance. For example, application number 202111355187.3 uses a huge database to analyze power information to identify the relationship between households and transformers. This method has problems such as slow household-transformer relationship identification and easy deviation and error in comparison. In general, there are currently nearly 200 patents related to the identification of transformer-to-station relationships. There are different forms of transformer-to-station relationship identification methods such as instantaneous faults, characteristic values, various data information processing, line loss, and system power. Either high-frequency signals are generated during identification, resulting in cross-station phenomena, or complex processing algorithms are used, making identification difficult. At the same time, they all have more or less the characteristics of low recognition accuracy and long recognition cycles. Summary of the Invention

[0004] The present invention provides a method for intelligently identifying the relationship between power supply stations and users in a power supply area, aiming to solve the shortcomings existing in the prior art.

[0005] In order to achieve the above-mentioned object, the present invention provides the following technical solution: a method for intelligently identifying the relationship between power supply stations and users in power supply areas, comprising:

[0006] Collect the voltage on the low-voltage side of the transformer and the voltage, current, power, and phase angle of each user end at a first moment, and calculate a first voltage drop value from the low-voltage side of the transformer to each user;

[0007] Calculate the line impedance from the low-voltage side of the transformer to each user end according to the first voltage drop value and the power;

[0008] Traverse the process of collecting the transformer low-voltage side voltage and each user-end voltage, current, and phase angle at other time points, and stop traversing when the transformer low-voltage side voltage at any time point is different from the voltage at the first time point;

[0009] A second voltage drop value from the low-voltage side of the transformer to each user is calculated based on the voltage on the low-voltage side of the transformer at that moment;

[0010] A third voltage drop value is obtained by multiplying the impedance value from the low-voltage side of the transformer to each user collected at the first time point by the current value collected at the same time point;

[0011] The second voltage drop value is compared with the third voltage drop value for consistency to determine the station-user relationship.

[0012] Preferably, the specific process of obtaining the first voltage drop value from the low-voltage side of the transformer to each user includes:

[0013] Collect the transformer low-voltage side voltage U10 at the first moment;

[0014] Collect the voltage U2 sequence [U21 U22 U23 ... U2n] of each user end, the current I2 sequence [I21 I22 I23 ... I2n] of each user end, the phase Q2 sequence [Q21 Q22 Q23 ... Q2n] of each user end, the active power P2 sequence [P21 P22 P23 ... P2n] of each user end, and the reactive power q2 sequence [q21 q22 q23 ... q2n] of each user end at the first time point;

[0015] Set the resistance R2 sequence from the low-voltage side of the transformer to each user-end line to [R21 R22 R23 ... R2n], the reactance X2 sequence from the low-voltage side of the transformer to each user-end line to [X21 X22 X23 ... X2n], and set the voltage U2 drop sequence from the low-voltage side of the transformer to each user-end to [ΔU21 ΔU22 ΔU23 ... ΔU2n];

[0016] According to the voltage drop formula ΔU=U10-U2n, the voltage drop ΔU sequence value from the low-voltage side of the transformer to the user end [ΔU21 ΔU22 ΔU23......ΔU2n] is calculated.

[0017] Preferably, the specific process of calculating the line impedance from the low-voltage side of the transformer to each user end according to the first voltage drop value and the power includes:

[0018] According to the formula P=I 2 (R+jX)*cosQ,q=I 2 (R+jX)*sinQ calculates the resistance series value [R21 R22 R23......R2n] and reactance series value [X21 X22 X23......X2n] from the low-voltage side of the transformer to each user end;

[0019] Where I is the user-end current, R and X are the resistance and reactance of the line from the low-voltage side of the transformer to the user-end, and cosQ and sinQ are the cosine and sine values of the phase angle at the user-end, respectively.

[0020] Preferably, the traversal process of collecting the transformer low-voltage side voltage and each user-end voltage, current, and phase angle at other time points includes:

[0021] Collect the transformer low-voltage side voltage U11 at other time points;

[0022] Collect each user-side voltage sequence [U31 U32 U33...U3w], each user-side current sequence [I31 I32 I33...I3w], and each user-side phase sequence [Q31 Q32 Q33...Q3w];

[0023] The voltage U3 drop sequence from the low-voltage side of the transformer to each user end is set to [ΔU31 ΔU32 ΔU33......ΔU3w];

[0024] According to the voltage drop formula ΔU=U11-U3w, the voltage drop ΔU sequence value from the low-voltage side of the transformer to the user end [ΔU31 ΔU32 ΔU33......ΔU3w] is calculated.

[0025] Preferably, the specific process of obtaining the third voltage drop value includes:

[0026] The third voltage drop sequence is obtained by multiplying the current of each user end at other time points by the impedance value at the first time point.

[0027] Combine [ΔU31 ΔU32 ΔU33......ΔU3w] with A consistency comparison is performed. If the error values between the two are within the threshold range, it is determined that the user is in the transformer area; otherwise, the user is not in the transformer area.

[0028] Preferably, when determining the relationship between the user and the platform, the process of determining the relationship between the user and the platform is repeated multiple times. If there are two inconsistent calculation results during the calculation process, the user can be marked as an abnormal user for further determination.

[0029] Preferably, for the abnormal user obtained, it is necessary to further confirm the platform-user relationship for the abnormal user, and the specific process includes the following steps:

[0030] Install a low-frequency signal generator on the low-voltage side of the transformer;

[0031] A low-frequency signal generator is used to generate two sets of low-frequency sine wave signals with different frequencies and a certain time interval, and characteristic values are added to the two sets of sine wave signals. At the same time, when the low-frequency sine wave signal is sent, the system will also send out the address of the concentrator;

[0032] Set up a collector at the collection terminal at the low-voltage end of the transformer;

[0033] Collect the sine wave signal and characteristic value through the collector and record them;

[0034] The low-frequency signal generator sends the sinusoidal wave signal and characteristic value to the power grid on the low-voltage side of the transformer;

[0035] The user-side electric meter receives normal grid information, and receives the address information and two sets of low-frequency sinusoidal wave signals with characteristic information sent by the concentrator, and sends the received waveform information and address information to the collection terminal on the low-voltage side of the transformer through carrier communication;

[0036] The acquisition terminal performs consistency comparison based on each received waveform information, address information, recorded waveform information and the inherent address of the concentrator;

[0037] If the received waveform information and address are consistent with the recorded waveform information and the inherent address of the concentrator, the user and the transformer are in the same substation; otherwise, the user and the transformer are not in the same substation.

[0038] Preferably, when adding characteristic values to the two groups of different low-frequency sine wave signals, the different sine wave signals to be sent are determined by adding the characteristic values of different waveform signals, and the two groups of low-frequency sine wave signals with characteristic values are sent at a certain interval.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] 1. The present invention determines the impedance and voltage drop from the transformer's low-voltage side to each user by first collecting the voltage and current phase angles. The impedance and voltage drop values are then compared with the voltage and current values determined by the second collection, and the voltage drop value obtained by multiplying the current by the impedance. If they are consistent, the user is determined to be within the transformer area. If they are inconsistent, the user is determined to be outside the transformer area. This method features fast station-to-user relationship recognition, high accuracy, and eliminates cross-station issues.

[0041] 2. The present invention further determines the station-user relationship by adding a low-frequency signal with a characteristic value to the low-voltage side of the transformer, and comparing the low-frequency signal information with the characteristic value returned by the user with the consistency of the low-frequency information sent out. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 This is the overall flow chart provided by the present invention.

[0043] Figure 2 The present invention provides a flow chart for further confirming the relationship between the platform and the user. DETAILED DESCRIPTION

[0044] The following embodiments of the present invention are further described in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0045] For the purpose of understanding and explanation, a method for intelligently identifying the relationship between power supply stations and users in power supply areas according to an embodiment of the present invention is described in detail below.

[0046] like Figure 1 As shown, a method for intelligently identifying the relationship between power supply stations and users in power supply areas includes the following steps:

[0047] Step 1: Collect the voltage on the low-voltage side of the transformer and the voltage, current, power and phase angle of each user at the first time point, and calculate the first voltage drop value from the low-voltage side of the transformer to each user.

[0048] Step 2: Calculate the line impedance from the low-voltage side of the transformer to each user end according to the first voltage drop value and the power.

[0049] Step 3: Traverse the process of collecting the transformer low-voltage side voltage and each user-end voltage, current, and phase angle at other time points, and stop traversing when the transformer low-voltage side voltage at any time point is different from the voltage at the first time point.

[0050] Step 4: Calculate the second voltage drop value from the low-voltage side of the transformer to each user based on the voltage on the low-voltage side of the transformer at that moment.

[0051] Step 5: The third voltage drop value is obtained by multiplying the impedance value from the low-voltage side of the transformer to each user collected at the first time point by the current value collected at the same time point.

[0052] Step 6: Compare the second voltage drop value with the third voltage drop value for consistency to determine the station-user relationship.

[0053] The steps for identifying the relationship between the platform and the household are as follows:

[0054] S1: The specific process of obtaining the first voltage drop value from the low-voltage side of the transformer to each user includes:

[0055] Collect the transformer low-voltage side voltage U10 at the first time point, which is any time point and each user-side voltage U2 sequence [U21 U22 U23...U2n], each user-side current I2 sequence [I21 I22I23...I2n], each user-side phase Q2 sequence [Q21 Q22 Q23...Q2n], each user-side active power P2 sequence [P21 P22 P23...P2n] and reactive power q2 sequence [q21 q22 q23...q2n], where n is the number of users that can be collected.

[0056] S2: Set the resistance R2 sequence from the low-voltage side of the transformer to each user-end line to [R21 R22R23...R2n], the reactance X2 sequence from the low-voltage side of the transformer to each user-end line to [X21 X22X23...X2n], and set the voltage U2 drop sequence from the low-voltage side of the transformer to each user-end to [ΔU21 ΔU22ΔU23...ΔU2n].

[0057] S3: According to the voltage drop formula ΔU=U10-U2n, the voltage drop ΔU sequence value [ΔU21 ΔU22 ΔU23......ΔU2n] from the low-voltage side of the transformer to the user end is calculated. According to the formula P=I 2 (R+jX)*cosQ,q=I 2(R+jX)*sinQ calculates the resistance series [R21 R22 R23...R2n] and reactance series [X21 X22 X23...X2n] from the transformer's low-voltage side to each user. In this formula, ΔU is the voltage drop from the transformer's low-voltage side to the user, I is the current at the user, R and X are the resistance and reactance of the line from the transformer's low-voltage side to the user, respectively, U2 is the voltage at the user, and cosQ and sinQ are the cosine and sine of the phase angle at the user, respectively. Because the conductor diameter, installation conditions, and installation environment of the line from the transformer's low-voltage side to each user are fixed, the calculated resistance and reactance values from the transformer's low-voltage side to each user are also fixed.

[0058] S4: Collect the transformer low-voltage side voltage U11 at the second time point and each user-side voltage sequence [U31U32U33......U3w], each user-side current sequence [I31I32I33......I3w], and each user-side phase sequence [Q31Q32Q33......Q3w]. w is the number of users that can be collected at the second time point. According to the method of S2, the voltage drop sequence from the low-voltage side of the transformer to each user [ΔU31ΔU32ΔU33......ΔU3w] can be calculated. At the same time, a voltage drop sequence can also be obtained by multiplying the current collected this time and the impedance value calculated in S2.

[0059] Compare [ΔU31 ΔU32 ΔU33......ΔU3w] obtained in S4 with Whether the corresponding values are consistent, if the corresponding error of the two voltage drop values is less than or equal to 0.3V, it is considered that the user is within the transformer area; if the corresponding value is greater than 0.3V, it is considered that the user is not within the transformer area.

[0060] The present invention proposes a household-transformer relationship identification method based on voltage drop. In order to further confirm the household-substation relationship identified by voltage drop, a low-frequency sine wave is applied to the low-voltage side of the distribution transformer, and characteristic information is added to the low-frequency sine wave. The characteristic information of the low-frequency sine wave is read at the meter end, and the read characteristic information is returned to the centralized unit of the distribution transformer for analysis and comparison with the sent sine wave and characteristic information to further confirm the household-substation relationship.

[0061] Example 1: In order to further confirm the area where the user is located, S1-S4 can be repeated for multiple confirmations. If the same result can be obtained each time the calculation is confirmed, the above-determined station-user relationship can be further confirmed. If there are two inconsistent calculation results during the calculation process, the user can be marked as an abnormal user and further confirmation is required.

[0062] For abnormal users, it is necessary to further confirm the relationship between the abnormal users and the users, or further verify the confirmed relationship between the users and the users. The specific process includes the following steps:

[0063] A low-frequency signal generator is installed on the low-voltage side of the transformer. This generator generates two sinusoidal signals with frequencies of 200 Hz and 300 Hz, each with an effective amplitude of 80 V. It also adds a characteristic value to the sine wave signals. The characteristic value can be a square wave signal, a triangle wave signal, or any other signal. The low-frequency signal and its characteristic value are collected and recorded by a data acquisition terminal on the low-voltage side of the transformer. The low-frequency signal generator then transmits the two low-frequency signals and the characteristic value to the power grid on the low-voltage side of the transformer, along with the address of the concentrator.

[0064] The user-side electric meter collects the received grid signals and waveforms, and sends the collected waveform information and address information to the collection terminal on the low-voltage side of the transformer through carrier communication. Then, each waveform information sent is compared with the recorded waveform information. After comparison, if the waveforms are consistent and the addresses are the same, it is considered that the user and the transformer are in the same area. If the compared waveforms are inconsistent, the user is not in the transformer area.

[0065] The above-described embodiments are only preferred specific implementation methods of the present invention, and the protection scope of the present invention is not limited thereto. Any simple changes or equivalent replacements of the technical solutions that can be obviously obtained by any technician familiar with the field within the technical scope disclosed in the present invention fall within the protection scope of the present invention.

Claims

1. A method for intelligently identifying the relationship between power supply stations and users, characterized in that: The steps include: Collect the voltage on the low-voltage side of the transformer and the voltage, current, power, and phase angle of each user end at a first moment, and calculate a first voltage drop value from the low-voltage side of the transformer to each user; Calculate the line impedance from the low-voltage side of the transformer to each user end according to the first voltage drop value and the power; Traverse the process of collecting the transformer low-voltage side voltage and each user-end voltage, current, and phase angle at other time points, and stop traversing when the transformer low-voltage side voltage at any time point is different from the voltage at the first time point; A second voltage drop value from the low-voltage side of the transformer to each user is calculated based on the voltage on the low-voltage side of the transformer at that moment; A third voltage drop value is obtained by multiplying the impedance value from the low-voltage side of the transformer to each user collected at the first time point by the current value collected at the same time point; The second voltage drop value is compared with the third voltage drop value for consistency to determine the station-user relationship.

2. The method for intelligently identifying the relationship between power supply stations and users according to claim 1, characterized in that: The specific process of obtaining the first voltage drop value from the low-voltage side of the transformer to each user includes: Collect the transformer low-voltage side voltage U10 at the first moment; At the first time point, each user-side voltage U2 sequence [U21 U22 U23 ... U2n], each user-side current I2 sequence [I21 I22 I23 ... I2n], each user-side phase Q2 sequence [Q21 Q22Q23 ... Q2n], each user-side active power P2 sequence [P21 P22 P23 ... P2n], and reactive power q2 sequence [q21 q22q23 ... q2n] are collected; Set the resistance R2 sequence from the low-voltage side of the transformer to each user-end line to [R21 R22R23 ... R2n], the reactance X2 sequence from the low-voltage side of the transformer to each user-end line to [X21 X22X23 ... X2n], and set the voltage drop sequence from the low-voltage side of the transformer to each user-end to [ΔU21 ΔU22 ΔU23 ... ΔU2n]; According to the voltage drop formula ΔU=U10-U2n, the voltage drop ΔU sequence value from the low-voltage side of the transformer to the user end [ΔU21ΔU22ΔU23......ΔU2n] is calculated.

3. The method for intelligently identifying the relationship between power supply stations and users according to claim 2, characterized in that: The specific process of calculating the line impedance from the low-voltage side of the transformer to each user end according to the first voltage drop value and the power includes: According to the formula P=I 2 (R+jX)*cosQ,q=I 2 (R+jX)*sinQ calculates the resistance series value [R21 R22 R23......R2n] and reactance series value [X21 X22X23......X2n] from the low-voltage side of the transformer to each user end; Where I is the user-end current, R and X are the resistance and reactance of the line from the low-voltage side of the transformer to the user-end, and cosQ and sinQ are the cosine and sine values of the phase angle at the user-end, respectively.

4. The method for intelligently identifying the relationship between power supply stations and users according to claim 3, characterized in that: The process of traversing the process of collecting the transformer low-voltage side voltage and each user-end voltage, current, and phase angle at other time points includes: Collect the transformer low-voltage side voltage U11 at other time points; Collect each user-side voltage sequence [U31 U32 U33...U3w], each user-side current sequence [I31I32 I33...I3w], and each user-side phase sequence [Q31 Q32 Q33...Q3w]; The voltage U3 drop sequence from the low-voltage side of the transformer to each user end is set to [ΔU31ΔU32ΔU33......ΔU3w]; According to the voltage drop formula ΔU=U11-U3w, the voltage drop ΔU sequence value from the low-voltage side of the transformer to the user end [ΔU31ΔU32ΔU33......ΔU3w] is calculated.

5. The method for intelligently identifying the relationship between power supply stations and users according to claim 4, characterized in that: The specific process of obtaining the third voltage drop value includes: The third voltage drop sequence is obtained by multiplying the current of each user end at other time points by the impedance value at the first time point. Combine [ΔU31ΔU32ΔU33......ΔU3w] with A consistency comparison is performed. If the error value between the two is within the threshold range, it is determined that the user is in the transformer area; otherwise, it is determined that the user is not in the transformer area.

6. The method for intelligently identifying the relationship between power supply stations and users according to claim 1, characterized in that: When determining the relationship between the user and the platform, the process of determining the relationship between the user and the platform is repeated multiple times. In the calculation process, there may be a case where the two calculation results are inconsistent. The user can be marked as an abnormal user for further determination.

7. The method for intelligently identifying the relationship between power supply stations and users according to claim 6, characterized in that: For the abnormal user obtained, it is necessary to further confirm the platform-user relationship of the abnormal user, and the specific process includes the following steps: Install a low-frequency signal generator on the low-voltage side of the transformer; A low-frequency signal generator is used to generate two sets of low-frequency sine wave signals with different frequencies and a certain time interval, and characteristic values are added to the two sets of sine wave signals. At the same time, when the low-frequency sine wave signal is sent, the system will also send out the address of the concentrator; Set up a collector at the collection terminal at the low-voltage end of the transformer; Collect the sine wave signal and characteristic value through the collector and record them; The low-frequency signal generator sends the sinusoidal wave signal and characteristic value to the power grid on the low-voltage side of the transformer; The user-side electric meter receives normal grid information, and receives the address information and two sets of low-frequency sinusoidal wave signals with characteristic information sent by the concentrator, and sends the received waveform information and address information to the collection terminal on the low-voltage side of the transformer through carrier communication; The acquisition terminal performs consistency comparison based on each received waveform information, address information, recorded waveform information and the inherent address of the concentrator; If the received waveform information and address are consistent with the recorded waveform information and the inherent address of the concentrator, the user and the transformer are in the same substation; otherwise, the user and the transformer are not in the same substation.

8. The method for intelligently identifying the relationship between power supply stations and users according to claim 7, characterized in that: When adding characteristic values to the two groups of different low-frequency sine wave signals, the different sine wave signals to be sent are determined by adding the characteristic values of the different waveform signals, and the two groups of low-frequency sine wave signals with characteristic values are sent at a certain interval.

Images