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

Abstract

The invention discloses a double-bus wiring outgoing line position judgment method based on a monitoring information event system, which comprises the following steps of: (1) judging an outgoing line position according to the state of a bus knife switch, and determining a bus connected with an outgoing line by monitoring the on-off state of the knife switch; (2) calculating an inflow current and an outflow current on a bus according to transformer substation equipment current data in the monitoring information event system, and verifying whether a judgment result in the step (1) accords with a Kirchhoff's current law; and (3) comparing the calculation result of the step (2) with a current balance threshold value, if the result is greater than the threshold value, triggering an exception handling flow, returning to the step (1), and checking the position of the knife switch. The technical problem that the double-bus wiring outgoing line position cannot be efficiently and accurately judged is solved.

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 current verification, and belongs to the technical field of power system automation and intelligent monitoring. Background Art

[0002] In the 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 modes, the correct judgment of the outgoing line position is crucial to ensure the safe and stable operation of the power system. The traditional judgment method relies on manual experience and has a single 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. Summary of the invention

[0003] The purpose of the present invention is to provide a method for determining the position of a double busbar wiring outlet based on switch status and current verification, to solve the technical problem that the position of a double busbar wiring outlet cannot be determined efficiently and accurately, 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] The present invention provides a method for determining the position of a double busbar connection outlet based on a monitoring information event system, comprising the following steps:

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

[0007] (2) Calculate the inflow current and outflow current on the busbar based on the substation equipment current data in the monitoring information event system, and verify whether the judgment result in step (1) complies with Kirchhoff's current law;

[0008] (3) Compare the calculation result of step (2) with the current balance threshold. If the result is greater than the threshold, the exception handling process is triggered, and the process returns to step (1) and checks 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:

[0012] First, 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;

[0013] 2) Monitor the status of the switch:

[0014] 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);

[0015] 3) Establish logical relationships:

[0016] If the switch 1 connected to bus A is closed, and the switch 2 connected to bus B is open, the outgoing line is connected to bus A; if the switch 2 connected to bus B is closed, and the 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 judged as an abnormal state;

[0017] Furthermore, the step (2) comprises the following steps:

[0018] 4) Current measurement:

[0019] (4.1) Current transformer installation: A current transformer is installed at the connection point between each outgoing line and the busbar to measure the current value flowing into and out of the busbar in real time;

[0020] (4.2) Current value identification: For bus A, the inflow current is identified as I A , the outflow current of the i-th outgoing line is marked as I Aouti ; For busbar B, the inflow current is marked as I B , the outflow current of the i-th outgoing line is marked as I Bouti ;

[0021] 5) Data collection:

[0022] The data acquisition system is used to obtain the current value measurement data of all current transformers at the same time point in real time;

[0023] 6) Current balance calculation:

[0024] According to Kirchhoff's current law, calculate the current balance of each node; for a node, the sum of the inflow current should be equal to the sum of the outflow current; for bus A and bus B and their outgoing lines, the current balance value of bus A is: The current balance value of bus B is

[0025] Furthermore, the step (3) comprises the following steps:

[0026] 7) Comparison of results: Considering the measurement error and system fluctuation in actual application, the calculation result of current balance Δ A , Δ BSet the threshold to 0.01 and compare whether the calculation result is less than or equal to the threshold. If so, verify that the wire position judgment in step (1) is correct.

[0027] 8) Exception handling: If the calculated result of the current balance is greater than the threshold, the switch status and current measurement data need to be rechecked to identify possible errors or abnormalities.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] In the existing double busbar wiring system, accurate judgment of the outgoing line position is crucial for the safe and stable operation of the power system. The traditional judgment method relies on manual experience and single judgment criteria, which is not only inefficient but also prone to errors. The invention realizes an automatic, efficient and accurate outgoing line position judgment method, which can adapt to measurement errors and system fluctuations in practical applications and improve the monitoring information event system function. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a flow chart of the present invention;

[0031] Figure 2 This is a typical double busbar wiring diagram;

[0032] Figure 3 This is the knife configuration diagram. DETAILED DESCRIPTION

[0033] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0034] 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 opening and closing states of the busbar switch. Then, the inflow current and outflow current on the busbar are calculated based on the current data of the substation equipment in the monitoring information event system to verify whether the judgment result in step one conforms to Kirchhoff's current law.

[0035] Figure 2 The typical double busbar wiring diagram is shown, with 2m+2 circuit breakers connected to the busbar. Figure 1 , 2 , 3. The method comprises the following steps:

[0036] Step 1: Determine the outgoing line position according to the status of the knife, and determine the busbar to which the outgoing line is connected by monitoring the opening and closing status of the knife:

[0037] 1) Identify the switch configuration:

[0038] 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.

[0039] 2) Monitor the status of the switch:

[0040] 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).

[0041] 3) Establish logical relationships:

[0042] 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.

[0043] Step 2: Calculate the inflow current and outflow current on the busbar based on the substation equipment current data in the monitoring information event system, and verify whether the judgment result in step 1 complies with Kirchhoff's current law:

[0044] 4) Current measurement:

[0045] (4.1) Current Transformer (CT) Installation: A current transformer is installed at the connection point between each outgoing line and the busbar to measure the current value flowing into and out of the busbar in real time.

[0046] (4.2) Current value identification: For bus A, the inflow current is identified as I A , the outflow current of the i-th outgoing line is marked as I Aouti ; For busbar B, the inflow current is marked as I B , the outflow current of the i-th outgoing line is marked as I Bouti .

[0047] 5) Data collection:

[0048] (1) Use the data acquisition system to obtain the measurement data of all relevant current transformers in real time.

[0049] (2) Ensuring the synchronization of data acquisition so that all relevant current values ​​are obtained at the same time point is crucial for accurate calculation of current balance.

[0050] 6) Current balance calculation:

[0051] According to Kirchhoff's Current Law (KCL), the current balance of each node is calculated. For a node, the sum of the inflow current should be equal to the sum of the outflow current. For bus A and bus B, and their outgoing lines, the calculation formula can be expressed as:

[0052] Step 3: If the current verification result is inconsistent with the switch status judgment, the exception handling process is triggered and returns to the first step to check the switch position:

[0053] (7) Comparison of results: Considering the measurement error and system fluctuation in actual application, the calculation result of current balance Δ A ,Δ B A threshold should be set for comparison. Here, the threshold is set to 0.01. Compare whether the calculation result is less than or equal to the threshold. If so, it verifies that the wire position judgment in step 1 is correct.

[0054] (8) Exception handling: If the calculated result is greater than the threshold, the switch status and current measurement data need to be rechecked to identify possible errors or exceptions.

[0055] 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 a monitoring information event system, characterized in that: The following steps are involved: (1) Determine the outgoing line position based on the state of the busbar switch, and determine the busbar to which the outgoing line is connected by monitoring the opening and closing state of the switch; (2) Calculate the inflow current and outflow current on the busbar based on the substation equipment current data in the monitoring information event system, and verify whether the judgment result in step (1) complies with Kirchhoff's current law; (3) Compare the calculation result of step (2) with the current balance threshold. If the result is greater than the threshold, the exception handling process is triggered, and the process returns to step (1) and checks the switch position.

2. The method for determining the position of the double busbar connection outlet based on the monitoring information event system according to claim 1, characterized in that: The step (1) comprises: 1) Identify the switch configuration: First, 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 logical relationships: 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 judged to be an abnormal state.

3. The method for determining the position of the double busbar connection outlet based on the monitoring information event system according to claim 1, characterized in that: The step (2) comprises: 4) Current measurement: (4.1) Current transformer installation: Install a current transformer at the connection point between each outgoing line and the busbar to measure the current value flowing into and out of the busbar in real time; (4.2) Current value identification: For busbar A, the inflow current is identified as I A , the outflow current of the i-th outgoing line is marked as I Aouti ; For busbar B, the inflow current is marked as I B , the outflow current of the i-th outgoing line is marked as I Bouti ; 5) Data collection: The data acquisition system is used to obtain the current value measurement data of all current transformers at the same time point in real time; 6) Current balance calculation: According to Kirchhoff's current law, calculate the current balance of each node; for a node, the sum of the inflow current should be equal to the sum of the outflow current; for bus A and bus B and their outgoing lines, the current balance value of bus A is: The current balance value of bus B is 4. The method for determining the position of the double busbar connection outlet based on the monitoring information event system according to claim 1, characterized in that: The step (3) comprises: 7) Calculation result of current balance Δ A , Δ B Set the threshold to 0.01 and compare whether the calculation result is less than or equal to the threshold. If so, verify that the wire position judgment in step (1) is correct. 8) Exception handling: If the calculated result of the current balance is greater than the threshold, the switch status and current measurement data need to be rechecked to identify possible errors or abnormalities.

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