Double-bus wiring outgoing line position discrimination method based on knife switch state and voltage verification

Abstract

The invention discloses a double-bus wiring outgoing line position judgment method based on knife switch state and voltage verification, which is characterized by comprising the following steps of: (1) judging an outgoing line position according to the state of a knife switch, and determining a bus connected with an outgoing line by monitoring the on-off state of the knife switch; (2) according to voltage data of transformer substation equipment in the monitoring information event system, calculating a Pearson's correlation coefficient aiming at the voltage of a bus connected with two ends of each outgoing line; and (3) determining the intensity and direction of the linear relationship between the two voltage data sequences according to the calculation result of the step (2), and further verifying whether the judgment result in the step (1) is correct or not. The problems that a traditional judgment method depends on artificial experience, the criterion is single, the efficiency is low, and errors are prone to occurring are solved. According to the invention, the automatic, high-efficiency and accurate outgoing line position discrimination method is realized.

Description

Technical Field

[0001] The invention relates to a method for determining the position of a double busbar connection outlet based on switch state and voltage verification, and belongs to the technical field of power system automation and intelligent monitoring equipment. Background Art

[0002] In the current power system, double busbar connection is one of the common connection methods in substations, which has the characteristics of power supply reliability and flexibility. However, due to the large number of outgoing lines and complex operation mode of double busbar connection, the correct judgment of the outgoing line position is crucial to ensure the safe and stable operation of the power system. At present, the traditional judgment method relies on manual experience and has a single judgment criterion, which is not only inefficient but also prone to errors. Therefore, it is necessary to develop an automated, efficient and accurate outgoing line position judgment method to ensure the safe and stable operation of the power station. Summary of the invention

[0003] The purpose of the present invention is to provide a method for determining the position of the outgoing line of a double busbar connection based on the status of the switch and voltage verification, so as to solve the problems that the traditional judgment method relies on manual experience and has a single judgment criterion, is inefficient, and is prone to errors, and to improve the function of the monitoring information event system.

[0004] The purpose of the present invention is achieved through the following technical solutions:

[0005] A method for determining the outgoing line position of a double busbar connection based on switch status and voltage verification comprises the following steps:

[0006] (1) Determine the outgoing line position based on the status of the switch, and determine the busbar to which the outgoing line is connected by monitoring the opening and closing status of the switch;

[0007] (2) Based on the substation equipment voltage data in the monitoring information event system, the Pearson correlation coefficient is calculated for the bus voltage connected to both ends of each outgoing line;

[0008] (3) Determine the strength and direction of the linear relationship between the two voltage data sequences based on the calculation results of step (2), and then verify whether the judgment result in step (1) is correct. If it is not correct, trigger the exception handling process and return to step (1) to check the switch position.

[0009] The purpose of the present invention can also be further achieved by the following technical measures:

[0010] Furthermore, the step (1) comprises the following steps:

[0011] 1) Identify the switch configuration between each outgoing line and busbar A and busbar B. There are two switches on the busbar side of each outgoing line, one connected to busbar A, marked as switch 1, and the other connected to busbar B, marked as switch 2. The line side switch is marked as switch 3;

[0012] 2) Monitor the status of the switch: Use the status monitoring device to monitor the status of each switch in real time. The status is "closed" (indicating that the outgoing line is connected to the corresponding busbar) or "open" (indicating that the outgoing line is not connected to the corresponding busbar);

[0013] 3) Establish a logical relationship: If switch 1 connected to bus A is closed and switch 2 connected to bus B is open, the outgoing line is connected to bus A; if switch 2 connected to bus B is closed and switch 1 connected to bus A is open, the outgoing line is connected to bus B; if both switches are closed or open, it is an abnormal state.

[0014] Furthermore, the step (2) comprises the following steps:

[0015] 4) Data collection:

[0016] Real-time collection of bus voltage data of the outgoing line and the bus voltage data of the downstream substation to which the outgoing line is connected; these data are continuous voltage readings, obtained at a certain sampling frequency (for example, 60 times per minute);

[0017] 5) Preprocessing:

[0018] Preprocess the collected voltage data, including removing noise, filling missing values, and data standardization to ensure data quality;

[0019] 6) Calculate the mean:

[0020] Calculate the sample mean of two voltage series

[0021] 7) Calculate the difference:

[0022] For each time point of voltage data, calculate the difference between it and the corresponding sequence mean

[0023] 8) Calculate the covariance:

[0024] Calculate the sum of the products of the differences of the two voltage series, i.e. the covariance

[0025] 9) Calculate the standard deviation:

[0026] Calculate the square root of the sum of the squares of the differences between the two voltage series, i.e. the standard deviation

[0027] 10) Calculate the Pearson correlation coefficient:

[0028] Calculate the Pearson correlation coefficient r:

[0029] Furthermore, the step (3) comprises the following steps:

[0030] 11) Interpretation of results: Based on the calculated Pearson correlation coefficient, the similarity of the two voltage series was determined: r values ​​close to 1 indicate a strong positive correlation, close to -1 indicate a strong negative correlation, and close to 0 indicate no linear correlation.

[0031] 12) Abnormal handling: If the Pearson correlation coefficient is close to -1 or 0, the switch status needs to be rechecked to identify possible abnormalities.

[0032] Compared with the prior art, the beneficial effects of the present invention are: solving the problems that the traditional judgment method relies on manual experience and has a single judgment criterion, is inefficient, and is prone to errors. The present invention realizes an automated, efficient, and accurate method for determining the position of an outgoing line, thereby ensuring the safe and stable operation of the power station and improving the function of the monitoring information event system. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a flow chart of the present invention;

[0034] Figure 2 This is a typical double busbar wiring diagram;

[0035] Figure 3 This is the knife configuration diagram. DETAILED DESCRIPTION

[0036] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0037] Figure 1 This is the flow chart of the present invention. First, the busbar to which the outgoing line is connected is determined by monitoring the on-off state of the busbar switch. Then, the linear correlation degree of the busbar voltages connected at both ends of each outgoing line is calculated based on the voltage data of the substation equipment in the monitoring information event system to verify whether the judgment result in step 1 is correct.

[0038] Figure 2 The typical double busbar wiring diagram is shown, with two circuit breakers connected to the busbar. Figure 1 , Figure 2 , Figure 3 Taking busbar A and its outgoing lines as an example, the method has the following steps:

[0039] Step 1: Determine the outgoing line position according to the status of the switch, and determine the busbar to which the outgoing line is connected by monitoring the opening and closing status of the switch.

[0040] (1) Identify the switch configuration:

[0041] First, you need to identify the switch configuration between each outgoing line and busbar A and busbar B. Usually, there are two switches on the busbar side of each outgoing line, one connected to busbar A, marked as switch 1, and the other connected to busbar B, marked as switch 2. The line side switch is marked as switch 3.

[0042] 2) Monitor the status of the switch:

[0043] The status of each relevant switch is monitored in real time using a status monitoring device. These states can be "closed" (indicating that the outgoing line is connected to the corresponding busbar) or "open" (indicating that the outgoing line is not connected to the corresponding busbar).

[0044] 3) Establish logical relationships:

[0045] If switch 1 connected to bus A is closed and switch 2 connected to bus B is open, the outgoing line is connected to bus A. If switch 2 connected to bus B is closed and switch 1 connected to bus A is open, the outgoing line is connected to bus B. If both switches are closed or both are open, this may indicate an abnormal condition and further inspection is required.

[0046] Step 2: According to the substation equipment voltage data in the monitoring information event system, the Pearson correlation coefficient is calculated for the bus voltage connected to both ends of each outgoing line.

[0047] 4) Data collection:

[0048] Real-time collection of bus voltage U where the outgoing line is located A1 The bus voltage U of the downstream substation connected to the outgoing line A2 Data. These data are continuous voltage readings, usually acquired at a certain sampling frequency (for example, 60 times per minute).

[0049] 5) Preprocessing:

[0050] The collected voltage data is preprocessed as necessary, including noise removal, missing value filling, data standardization, etc., to ensure the quality of the data.

[0051] 6) Calculate the mean:

[0052] Calculate the sample mean of the two voltage sequences for bus A respectively

[0053] 7) Calculate the difference:

[0054] For each time point of voltage data, calculate the difference between it and the corresponding sequence mean.

[0055] 8) Calculate the covariance:

[0056] Calculate the sum of the products of the differences of the two voltage series, i.e. the covariance

[0057] 9) Calculate the standard deviation:

[0058] Calculate the square root of the sum of the squares of the differences between the two voltage series, i.e. the standard deviation

[0059] 10) Calculate the Pearson correlation coefficient:

[0060] The Pearson correlation coefficient r was calculated using the following formula:

[0061] Step 3: Determine the strength and direction of the linear relationship between the two voltage data sequences based on the calculation result of step (2), and then verify whether the judgment result in step 1 is correct. If it is not correct, trigger the exception handling process and return to the first step to check the switch position.

[0062] 11) Result interpretation: Based on the calculated Pearson correlation coefficient, the similarity of the two voltage sequences can be determined. An r value close to 1 indicates a strong positive correlation, indicating that the judgment result in step 1 is correct.

[0063] 12) Abnormal handling: If the Pearson correlation coefficient is close to -1 or 0, the switch status needs to be rechecked to identify possible abnormalities.

[0064] In addition to the above embodiments, the present invention may also have other implementation modes. Any technical solutions formed by equivalent replacement or equivalent transformation shall fall within the protection scope required by the present invention.

Claims

1. A method for determining the outgoing line position of a double busbar connection based on switch status and voltage verification, characterized in that: The following steps are involved: (1) Determine the outgoing line position based on the status of the switch, and determine the busbar to which the outgoing line is connected by monitoring the opening and closing status of the switch; (2) Based on the substation equipment voltage data in the monitoring information event system, the Pearson correlation coefficient is calculated for the bus voltage connected to both ends of each outgoing line; (3) Determine the strength and direction of the linear relationship between the two voltage data sequences based on the calculation results of step (2), and then verify whether the judgment result in step (1) is correct. If it is not correct, trigger the exception handling process and return to step (1) to check the switch position.

2. A method for determining the position of a double busbar connection outlet based on switch status and voltage verification according to claim 1, characterized in that: The step (1) comprises the following steps: 1) Identify the switch configuration between each outgoing line and busbar A and busbar B. There are two switches on the busbar side of each outgoing line, one connected to busbar A, marked as switch 1, and the other connected to busbar B, marked as switch 2. The line side switch is marked as switch 3; 2) Monitor the status of the switch: Use the status monitoring device to monitor the status of each switch in real time, whether it is closed or open; 3) Establish a logical relationship: If switch 1 connected to bus A is closed and switch 2 connected to bus B is open, the outgoing line is connected to bus A; if switch 2 connected to bus B is closed and switch 1 connected to bus A is open, the outgoing line is connected to bus B; if both switches are closed or open, it is an abnormal state.

3. A method for determining the outgoing line position of a double busbar connection based on switch status and voltage verification as claimed in claim 1, characterized in that: The step (2) comprises the following steps: 4) Data collection: Real-time collection of bus voltage data of the outgoing line and the downstream substation to which the outgoing line is connected; 5) Preprocessing: Preprocessing the collected voltage data; 6) Calculate the mean: Calculate the sample mean of two voltage series 7) Calculate the difference: For each time point of voltage data, calculate the difference between it and the corresponding sequence mean 8) Calculate the covariance: Calculate the sum of the products of the differences of two voltage series, i.e. the covariance 9) Calculate the standard deviation: Calculate the square root of the sum of the squares of the differences between the two voltage series, i.e. the standard deviation 10) Calculate the Pearson correlation coefficient: Calculate the Pearson correlation coefficient r:

4. A method for determining the outgoing line position of a double busbar connection based on switch status and voltage verification as claimed in claim 1, characterized in that: The step (3) comprises the following steps: 11) Interpretation of results: Based on the calculated Pearson correlation coefficient, the similarity of the two voltage series was determined: r values ​​close to 1 indicate strong positive correlation, close to -1 indicate strong negative correlation, and close to 0 indicate no linear correlation; 12) Abnormal handling: If the Pearson correlation coefficient is close to -1 or 0, the switch status needs to be rechecked to identify possible abnormalities.

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