Direct current system switch closing judgment method and device, electronic equipment and storage medium

Abstract

The invention discloses a direct-current system switch closing judgment method and device, electronic equipment and a storage medium, and relates to the technical field of direct-current systems, and the method comprises the steps: detecting an operation event of a switch; in response to detection that the switch is switched from the first position to the second position, acquiring output current values and floating charge voltage parameters of the first charging device and the second charging device at a preset moment before operation; acquiring output current real-time values of the first charging device and the second charging device after the operation, and calculating output current change values of the first charging device and the second charging device before and after the operation; comparing the output current change value with a preset current change threshold value, and if the output current change value is greater than the preset current change threshold value, determining that the switch is closed in place; and if any output current change value is smaller than or equal to the preset current change threshold value, adjusting the floating charge voltage parameter, and repeating the steps until the switch is switched on in place so as to quickly judge whether the related switch operation is in place or not.

Description

Technical Field

[0001] This invention relates to the field of DC system technology, and specifically to a method, device, electronic device, and storage medium for determining the closing of a DC system switch. Background Technology

[0002] The DC system is a crucial component of a power plant, its primary function being to provide DC power for signaling and remote control equipment, protection and automatic devices, and circuit breaker operation. The proper functioning of the DC system directly impacts the correct operation of relay protection, safety devices, and circuit breakers, thus affecting the safe operation of the power plant and the entire power grid.

[0003] Existing DC systems generally consist of AC power distribution units, power distribution monitoring units, high-frequency rectifier modules, battery banks, battery inspection devices, insulation monitoring devices, DC monitoring devices, and AC current monitoring devices. Under normal circumstances, a segmented operation mode is used for the DC load bus. Because the electrical load of the DC system is extremely important and the reliability requirements for power supply are very high, DC system switching operations should be carried out according to the principle of "power on first, then power off" to prevent DC system power outages.

[0004] However, during DC system switching operations, if a switch falsely closes and is not detected in time, it will lead to a DC system power outage, directly affecting the safe operation of the power plant and even the entire power grid. Currently, there is a lack of effective automatic judgment methods to quickly identify whether the switching operation is truly in place. Summary of the Invention

[0005] In view of the above problems, the present invention provides a method, device, electronic device and storage medium for judging the closing of DC system switches, so as to quickly judge whether the relevant switch operation is in place.

[0006] In a first aspect, embodiments of the present invention provide a method for determining the closing status of a DC system switch, applicable to a DC system, wherein the DC system includes a first charging device, a second charging device, a load bus tie switch, and a DC output switch, and the method for determining the closing status of the DC system switch includes: The operation events of the detection switch are detected; the switch is a load bus tie switch or a DC output switch. In response to detecting that the switch has switched from the first position to the second position, the output current value and float charge voltage parameter of the first charging device and the second charging device are obtained at a predetermined time before the operation. After the operation, obtain the real-time output current values ​​of the first and second charging devices, and calculate the change in output current of the first and second charging devices before and after the operation. Compare the output current change value with a predetermined current change threshold. If the output current change value is greater than the predetermined current change threshold, then it is determined that the switch is closed. If any of the output current changes is less than or equal to the predetermined current change threshold, the float charge voltage parameter is adjusted, and the real-time output current value after the operation is repeatedly acquired and compared until all output current changes are greater than the predetermined current change threshold, confirming that the switch is closed.

[0007] In some embodiments, adjusting the float charge voltage parameter includes: The float charge voltage parameters are gradually adjusted in predetermined voltage steps until the output current change values ​​are all greater than the predetermined current change threshold. After determining that the circuit breaker is in place, the float charge voltage parameters are restored to their pre-operation values.

[0008] In some embodiments, when the switch is a load bus tie switch, the first position is the first load bus position, and the second position is the second load bus position; obtaining the output current values ​​of the first charging device and the second charging device at a predetermined time before operation includes: Read the output current values ​​of the first charging device and the second charging device at the moment before operation.

[0009] In some embodiments, when the switch is a DC output switch, the first position is the off position and the second position is the load bus position; obtaining the output current values ​​of the first charging device and the second charging device at a predetermined time before operation includes: The output current value of the charging device corresponding to the DC output switch is set to zero at the moment before operation.

[0010] In some embodiments, the DC system switch closing determination method further includes: When the circuit breaker is closed or an alarm is triggered, a signal indicator light will be activated. This signal needs to be manually reset.

[0011] In some embodiments, at least one of the predetermined current change threshold, predetermined voltage step size, or predetermined time is based on DC system tuning.

[0012] Secondly, embodiments of the present invention provide a DC system switch closing judgment device, wherein the DC system includes a first charging device, a second charging device, a load bus tie switch, and a DC output switch, and the device includes: The detection module is used to detect the operation events of the switch, which is a load bus tie switch or a DC output switch; The parameter acquisition module is used to acquire the output current value and float charge voltage parameter of the first charging device and the second charging device at a predetermined time before the operation in response to detecting that the switch is switched from the first position to the second position. The calculation module is used to obtain the real-time output current values ​​of the first charging device and the second charging device after the operation, and to calculate the change in output current of the first charging device and the second charging device before and after the operation. The first determination module is used to compare the output current change value with a predetermined current change threshold. If the output current change value is greater than the predetermined current change threshold, it is determined that the switch is closed. The second determination module is used to adjust the float charge voltage parameter if any of the output current change values ​​is less than or equal to the predetermined current change threshold, and to repeatedly obtain and compare the real-time output current values ​​after the operation until all output current change values ​​are greater than the predetermined current change threshold, thus confirming that the switch is closed in place.

[0013] In some embodiments, the adjustment module is further configured to restore the float charge voltage parameter to its pre-operation value after determining that the circuit breaker is in place.

[0014] Thirdly, embodiments of this application provide an electronic device, including a memory and a processor, wherein the memory stores program code that can run on the processor, and when the program code is executed by the processor, it implements a DC system switch closing judgment method as described in any embodiment of the first aspect.

[0015] Fourthly, embodiments of this application provide a computer storage medium storing one or more programs, which can be executed by an electronic device as described in the third aspect to implement a DC system switch closing judgment method as described in any embodiment of the first aspect.

[0016] This invention provides a method, apparatus, electronic device, and storage medium for determining the closing of a DC system switch. The method includes: detecting an operation event of a switch, where the switch is a load bus tie switch or a DC output switch; in response to detecting that the switch has switched from a first position to a second position, acquiring the output current values ​​and float charge voltage parameters of a first charging device and a second charging device at a predetermined time before the operation; acquiring the real-time output current values ​​of the first charging device and the second charging device after the operation, and calculating the change in output current values ​​of the first charging device and the second charging device before and after the operation; comparing the change in output current values ​​with a predetermined current change threshold; if all the change in output current values ​​are greater than the predetermined current change threshold, determining that the switch is closed; if any change in output current value is less than or equal to the predetermined current change threshold, adjusting the float charge voltage parameters, and repeating the above steps until the switch is confirmed to be closed, so as to quickly determine whether the relevant switch operation is in place and whether there is a false closing phenomenon.

[0017] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0018] The invention will now be described in more detail with reference to embodiments and the accompanying drawings.

[0019] Figure 1 This diagram illustrates an exemplary method for determining the closing of a DC system switch according to an embodiment of the present invention. Figure 2 A schematic diagram of an exemplary DC system according to an embodiment of the present invention is shown; Figure 3 The diagram illustrates an exemplary flowchart for determining the completion of the I-section load bus tie switch 1LZK tie operation according to an embodiment of the present invention. Figure 4 The diagram illustrates a flowchart of the determination process for the closing operation of the DC output switch DK11 of the No. 1 charging device in an embodiment of the present invention at the load bus position of section I. Figure 5 The diagram illustrates an exemplary flowchart for determining the completion of the tie operation of the II-stage load bus tie switch 2LZK according to an embodiment of the present invention. Figure 6 The diagram illustrates a flowchart of the determination process for the closing operation of the DC output switch DK21 of the No. 2 charging device in the II section load bus position, according to an embodiment of the present invention. Figure 7 A structural block diagram of a DC system switch closing judgment device according to an embodiment of the present invention is shown; Figure 8 This paper shows a structural block diagram of an electronic device for performing a DC system switch closing determination method according to an embodiment of this application. Figure 9 This application illustrates a computer-readable storage medium for storing or carrying a method for determining the closing of a DC system switch according to an embodiment of this application. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this invention are only for explaining this invention and are not intended to limit this invention.

[0021] The DC system is a crucial component of a power plant. Its primary function is to provide DC power to signaling and remote control equipment, protection and automatic devices, and circuit breaker (switch) operation. The proper functioning of the DC system directly impacts the correct operation of relay protection, safety devices, and circuit breakers, thus affecting the safe operation of the power plant and the entire power grid.

[0022] A DC system typically consists of an AC power distribution unit, a power distribution monitoring unit, a high-frequency rectifier module, a battery bank, a battery inspection device, an insulation monitoring device, a DC monitoring device, and an AC current monitoring device. Under normal circumstances, it operates in a segmented DC load bus configuration. Because the DC system's load is extremely critical and requires high reliability, DC system switching operations should follow the principle of "power on first, then power off" to prevent power outages. However, if a switch experiences a false close during a DC system switching operation and is not detected in time, it will lead to a DC system power outage, directly affecting the safe operation of the power plant and even the entire power grid.

[0023] Therefore, it is necessary to solve the problem of how to quickly determine whether the relevant switching operations are in place during DC system switching operations.

[0024] This invention provides a method for judging the closing of a DC system switch. This method automatically and quickly judges whether the closing operation is truly in place based on the changes in relevant electrical quantity data before and after the operation.

[0025] One of the methods for determining the closing of a DC system switch will be described in detail in the following embodiments.

[0026] The following describes an application scenario of a DC system switch closing judgment method provided by an embodiment of the present invention: Please see Figure 1 , Figure 1 This is a schematic flowchart of a DC system switch closing judgment method provided in an embodiment of the present invention. In this embodiment, a DC system switch closing judgment method can be applied to, for example... Figure 7 The DC system switch closing judgment device 300 shown is neutral. Figure 8 In the electronic device 200 shown, the following is specifically for... Figure 1 The process is described in detail below. A method for judging the closing of a DC system switch is applied to a DC system. The DC system includes a first charging device, a second charging device, a load bus tie switch, and a DC output switch, and may include steps S110 to S150.

[0027] S110: Detects the operation event of the switch, which is either a load bus tie switch or a DC output switch.

[0028] In this embodiment, the DC system switching operation involves the position switching of key switches (such as load bus tie switches 1LZK / 2LZK or DC output switches DK11 / DK21). For example, in a segmented tie-off operation, the PLC (Programmable Logic Controller) detects in real time the event of 1LZK switching from the "Section I load bus position" to the "Section II load bus position" via the "disconnect position". The detection mechanism relies on the DC system monitoring unit, triggering subsequent judgment processes through switch position signals or changes in electrical quantities.

[0029] S120: In response to detecting that the switch has switched from the first position to the second position, the output current value and float charge voltage parameter of the first charging device and the second charging device are acquired at a predetermined time before the operation.

[0030] In this embodiment, pre-operation parameters (such as the output currents IT1 and IT2 of charging devices 1 and 2 at time T, and the float charge voltage parameter UT1) are used for subsequent comparisons. The value of T can be adjusted according to the actual system settings; for example, it can be set to a few seconds before operation to capture a stable state. Taking the 1LZK communication operation as an example, the PLC reads the current and voltage parameters before the switch is switched to ensure that the data reflects the load distribution before operation. The float charge voltage parameter is crucial for adjusting the output voltage, and its acquisition provides a basis for subsequent current redistribution judgment.

[0031] S130: Obtain the real-time output current values ​​of the first charging device and the second charging device after the operation, and calculate the change in output current of the first charging device and the second charging device before and after the operation.

[0032] In this embodiment, the real-time current values ​​I1 and I2 are obtained after the operation, and the current change value is calculated by the difference, such as ΔI1 = |I1 - IT1|, ΔI2 = |I2 - IT2|. The current change value reflects whether the load is redistributed after the switch operation: if the switch is actually closed, the current will shift significantly due to the change in path. For example, after 1LZK switches to the load bus position of section II, part of the load originally borne by charging device 1 is transferred to charging device 2, causing a change in the current of both. The calculation steps are automatically completed by the PLC, which improves efficiency and reduces human error.

[0033] S140: Compare the output current change value with the predetermined current change threshold. If the output current change value is greater than the predetermined current change threshold, then the switch is determined to be closed.

[0034] In this embodiment, the predetermined current change threshold ΔI can be set according to the system, such as based on historical data or safety margin. If the current change values ​​are all greater than ΔI, it indicates that the current has been redistributed and the switch is truly closed. For example, in 1LZK operation, if both ΔI1 and ΔI2 exceed the threshold, the PLC directly illuminates the "Operation Complete" indicator. This judgment logic avoids the risk of power failure caused by false switch closing, and the threshold comparison ensures the objectivity of the judgment.

[0035] S150: If any output current change value is less than or equal to the predetermined current change threshold, adjust the float charge voltage parameter, and repeat the steps of acquiring and comparing the real-time output current value after the operation until the output current change value is greater than the predetermined current change threshold, and confirm that the switch is closed in place.

[0036] In this embodiment, taking the 1LZK operation as an example: if the current change value does not meet the threshold, the PLC automatically lowers the float charge voltage parameter of the No. 1 charging device by a step size ΔU, forcing the current to redistribute by reducing the output voltage until the change value exceeds the threshold. Repeated comparisons ensure the reliability of the judgment, avoiding the delays of traditional manual checks. After adjustment, the voltage parameter will return to its original value, preventing any impact on the long-term operation of the system.

[0037] In some implementations, adjusting the float charge voltage parameters includes: The float charge voltage parameters are gradually adjusted in predetermined voltage steps until the output current change value is greater than the predetermined current change threshold. After determining that the circuit breaker is in place, restore the float charge voltage parameters to their pre-operation values.

[0038] In this embodiment, the ΔU step size can be adjusted, for example, by 0.1V each time, to balance adjustment accuracy and speed. Voltage regulation is achieved through a DC system monitoring unit. For example, in DK11 operation, if the current change is insufficient, the PLC gradually increases the float charge voltage to attract load transfer. The recovery mechanism is crucial. After the switch is closed, the voltage parameters are gradually restored to UT1 or UT2 to ensure the system returns to normal float charge state and avoids overvoltage or undervoltage risks.

[0039] In some embodiments, when the switch is a load bus tie switch, the first position is the first load bus position, and the second position is the second load bus position; obtaining the output current values ​​of the first charging device and the second charging device at a predetermined time before operation includes: Read the output current values ​​of the first and second charging devices at the moment before operation.

[0040] In this embodiment, the specific characteristics of the load bus tie switches are considered. Taking 1LZK and 2LZK as examples, their position switching involves load transfer between busbars, such as from stage I to stage II. The current value is directly read before operation because both charging devices are energized before the tie switch is switched. For example, before 2LZK switches from stage II to stage I, the PLC reads IT1 and IT2 to compare the changes in I1 and I2 after the operation, ensuring that the judgment is based on the actual load distribution and conforms to the requirements of the segmented operation mode.

[0041] In some implementations, when the switch is a DC output switch, the first position is the off position and the second position is the load bus position; acquiring the output current values ​​of the first and second charging devices at a predetermined time before operation includes: The output current value of the charging device corresponding to the DC output switch is set to zero at the moment before operation.

[0042] In this embodiment, to adapt to the characteristics of the DC output switch, DK11 or DK21 is in the open position before operation, and the actual output current of the corresponding charging device is zero. Therefore, a value of 0 is assigned to simplify the calculation. For example, before DK11 is closed, charging device 1 has no output, and IT1 is assigned 0; after operation, the current I1 changes from 0 to a positive value. Comparing this with the change in IT2, this assignment logic accurately reflects the load increase brought about by the switch closing, avoiding misjudgment.

[0043] In some implementations, a signal indicator light is activated when the circuit is closed or an operation alarm is triggered, and the signal needs to be manually reset.

[0044] In this embodiment, the PLC issues a signal after making a determination, such as illuminating the "Operation in Progress" or "Operation Alarm" indicator light to prompt the operator to continue or pause. The signal needs to be manually reset to ensure that the operator confirms the status before proceeding to the next step, preventing oversights caused by automatic reset. For example, in 1LZK operation, if the alarm light illuminates, the switch position needs to be checked on-site, enhancing safety.

[0045] Among them, at least one of the predetermined current change threshold, predetermined voltage step size, or predetermined time is based on DC system tuning.

[0046] In this embodiment, adjustments are made based on the charging device capacity, load size, or historical fault data, which improves versatility and reliability. The adjustment process can be completed through a monitoring interface without modifying the hardware.

[0047] In a specific application, taking a 220V DC system switching operation closing position auxiliary judgment as an example, the DC system switch closing judgment method of this application is illustrated through the following process: like Figure 1The DC system shown normally adopts a segmented operation mode for the DC load bus, that is, the I-section load bus tie switch 1LZK operates in the "I-section load bus position", the II-section load bus tie switch 2LZK operates in the "II-section load bus position"; the DC output switch DK11 of the No. 1 charging device operates in the "I-section load bus position", and the DC output switch DK21 of the No. 2 charging device operates in the "II-section load bus position".

[0048] Before performing live maintenance on the No. 1 battery bank of the DC system and the DC load section I, a segmented switching operation must be carried out to switch the DC load section I to DC load section II. During this operation, it is necessary to ensure that the switching operation of the section I load bus tie switch 1LZK is in place to ensure the stability and reliability of the DC load section I power supply during subsequent safety measures operations and maintenance.

[0049] Among them, see Figure 2 As shown, the steps for determining whether the tie operation of the I-section load bus tie switch 1LZK is in place are as follows: When the PLC detects that 1LZK switches from "Section I Load Bus Position" to "Section II Load Bus Position" via "Disconnect Position", the PLC reads the output currents IT1 and IT2 of charging devices 1 and 2 at time T before the 1LZK connection operation (T can be adjusted according to the actual situation) (at which time 1LZK is in "Section I Load Bus Position") and the "float charge voltage" parameter of charging device 1. UT1; and read the real-time output current values ​​I1 and I2 of charging devices 1 and 2 respectively after the 1LZK connection operation (at this time, 1LZK is in the "II section load bus position"). Compare the output current changes of charging devices 1 and 2 before and after the 1LZK communication operation. If the current change is greater than ΔI (ΔI can be adjusted according to the actual situation), it is considered that the current has been redistributed. The 1LZK communication operation is directly determined to be in place, and a signal is sent to light up the "1LZK communication operation in place" indicator light, indicating that the operation can continue.

[0050] If any current change value is less than ΔI, the PLC will lower the "float charge voltage" parameter of charging device 1, gradually decreasing it in steps of ΔU (ΔU can be adjusted according to actual conditions), with a minimum of not less than UT11 (UT11 can be adjusted according to actual conditions). The PLC will gradually decrease the output voltage of charging device 1 until all current changes are greater than ΔI, and will then issue a signal to illuminate the "1LZK communication operation in place" indicator. The PLC will then gradually increase the "float charge voltage" parameter of charging device 1 in steps of ΔU until it returns to the original value UT1. Otherwise, the PLC will issue a signal to illuminate the "operation alarm" indicator, prompting that operation needs to be suspended and on-site inspection required.

[0051] All of the above-mentioned signal indicator lights need to be manually reset.

[0052] After the DC system No. 1 battery pack and DC load section I are energized and maintained, a switching operation between the interconnection and the section needs to be performed to switch the section II connected to section I to section operation. During this operation, it is necessary to ensure that the DC output switch DK11 of the No. 1 charging device is closed in the "section I load bus position" to avoid the DC system losing power due to improper operation.

[0053] See Figure 4 The following are the steps for determining whether the DC output switch DK11 of charging device No. 1 is in the "I section load bus position" closing operation is in place: When the PLC detects that DK11 has switched from the "disconnected position" to the "I-section load bus position", the PLC reads the output current IT2 of charging device 2 and the "float charging voltage" parameter UT1 of charging device 1 at time T before the closing operation of DK11 in the "I-section load bus position" (T can be adjusted according to the actual situation), and assigns the output current IT1 of charging device 1 to 0 at that time (at this time, DK11 is in the "disconnected position" and the actual output current of charging device 1 is 0); and reads the real-time values ​​I1 and I2 of the output current of charging devices 1 and 2 after the closing operation of DK11 in the "I-section load bus position" (at this time, DK11 is in the "I-section load bus position").

[0054] Compare the output current changes of charging devices 1 and 2 before and after the DK11 closing operation in the "I section load bus position". If the current change value is greater than ΔI (ΔI can be adjusted according to the actual situation), it is considered that the current has been redistributed. It is directly determined that the DK11 closing operation in the "I section load bus position" is in place. The signal is turned on to illuminate the "DK11 closing operation in place" indicator light, indicating that the operation can continue.

[0055] If any current change value is less than ΔI, the PLC will increase the "float charge voltage" parameter of charging device 1, gradually increasing it in steps of ΔU (ΔU can be adjusted according to actual conditions), with a maximum not exceeding UT12 (UT12 can be adjusted according to actual conditions). The output voltage of charging device 1 will be gradually increased until all current changes are greater than ΔI. The PLC will then issue a signal to illuminate the "DK11 closing operation in place" indicator light and gradually decrease the "float charge voltage" parameter of charging device 1 in steps of ΔU until it returns to the original value UT1. Otherwise, the PLC will issue a signal to illuminate the "operation alarm" indicator light, indicating that the operation needs to be suspended and an on-site inspection is required.

[0056] All of the above-mentioned signal indicator lights need to be manually reset.

[0057] Before performing live maintenance on the DC system's No. 2 battery bank and DC load section II, a segmented switching operation must be carried out to switch the DC load section II to DC load section I for power supply. During this operation, it is necessary to ensure that the switching operation of the section II load bus tie switch 2LZK is in place to ensure the stability and reliability of the DC load section II power supply during subsequent safety measures operations and maintenance.

[0058] See Figure 5 , Figure 5 The procedure for determining whether the tie operation of the 2LZK tie switch on the II-section load bus tie switch is in place includes the following: When the PLC detects that 2LZK switches from "Section II Load Bus Position" to "Section I Load Bus Position" via "Disconnect Position", the PLC reads the output currents IT1 and IT2 of charging devices 1 and 2 at time T before the 2LZK connection operation (T can be adjusted according to the actual situation) (at this time, 2LZK is in "Section II Load Bus Position") and the "float charging voltage" parameter UT2 of charging device 2; and reads the real-time values ​​I1 and I2 of the output currents of charging devices 1 and 2 after the 2LZK connection operation (at this time, 2LZK is in "Section I Load Bus Position").

[0059] Compare the output current changes of charging devices 1 and 2 before and after the 2LZK communication operation. If the current change is greater than ΔI (ΔI can be adjusted according to the actual situation), it is considered that the current has been redistributed. The 2LZK communication operation is directly determined to be in place, and a signal is sent to light up the "2LZK communication operation in place" indicator light, indicating that the operation can continue.

[0060] If any current change value is less than ΔI, the PLC will lower the "float charge voltage" parameter of charging device 2, gradually decreasing it in steps of ΔU (ΔU can be adjusted according to actual conditions), with a minimum of UT21 (UT21 can be adjusted according to actual conditions). The output voltage of charging device 2 will be gradually reduced until all current changes are greater than ΔI. The PLC will then issue a signal to illuminate the "2LZK communication operation in place" indicator light and gradually increase the "float charge voltage" parameter of charging device 2 in steps of ΔU until it returns to the original value UT2. Otherwise, the PLC will issue a signal to illuminate the "operation alarm" indicator light, indicating that operation needs to be suspended and on-site inspection is required.

[0061] All the above-mentioned signal indicator lights need to be manually reset.

[0062] After the DC system No. 2 battery pack and DC load section II are energized and maintained, a switching operation between the interconnection and the section needs to be performed to switch the connection operation of section I with section II to the section operation. During this operation, it is necessary to ensure that the DC output switch DK21 of the No. 2 charging device is closed in the "section II load bus position" to avoid the DC system losing power due to improper operation.

[0063] See Figure 6The procedure for determining whether the DC output switch DK21 of charging device No. 2 is in the "II section load bus position" closing operation is in place includes the following: When the PLC detects that DK21 has switched from the "disconnected position" to the "II section load bus position", the PLC reads the output current IT1 of charging device 1 and the "float charging voltage" parameter UT2 of charging device 2 at time T before the closing operation of DK21 in the "II section load bus position" (T can be adjusted according to the actual situation), and assigns the output current IT2 of charging device 2 to 0 at that time (at this time, DK21 is in the "disconnected position" and the actual output current of charging device 2 is 0); and reads the real-time values ​​I1 and I2 of the output current of charging devices 1 and 2 after the closing operation of DK21 in the "II section load bus position" (at this time, DK21 is in the "II section load bus position").

[0064] Compare the output current changes of charging devices 1 and 2 before and after the DK21 closing operation in the "II section load bus position". If the current change value is greater than ΔI (ΔI can be adjusted according to the actual situation), it is considered that the current has been redistributed. It is directly determined that the DK21 closing operation in the "II section load bus position" is in place. The signal is turned on to illuminate the "DK21 closing operation in place" indicator light, indicating that the operation can continue.

[0065] If any current change value is less than ΔI, the PLC will increase the "float charge voltage" parameter of charging device No. 2, gradually increasing it in steps of ΔU (ΔU can be adjusted according to actual conditions), with a maximum not exceeding UT22 (UT22 can be adjusted according to actual conditions). The output voltage of charging device No. 2 will be gradually increased until all current changes are greater than ΔI. The PLC will then issue a signal to illuminate the "DK21 closing operation in place" indicator light and gradually decrease the "float charge voltage" parameter of charging device No. 2 in steps of ΔU until it returns to the original value UT2. Otherwise, the PLC will issue a signal to illuminate the "operation alarm" indicator light, indicating that the operation needs to be suspended and an on-site inspection is required.

[0066] All the above-mentioned signal indicator lights need to be manually reset.

[0067] This invention provides a method for judging the closing of DC system switches. Based on the changes in relevant electrical quantity data before and after the DC system switching operation, it can automatically and quickly determine whether the relevant switches have falsely closed, ensuring the reliability of DC system power supply and the safe and stable operation of power plant equipment. It eliminates the need for manual recording and comparison of relevant data, improving operational efficiency. It can automatically adjust the "float charging voltage" parameter of the DC system centralized monitoring device according to the program settings, so as to safely and conveniently adjust the output voltage of the corresponding charging device and avoid the risk of human error.

[0068] Please see Figure 7 , Figure 7This invention provides a structural block diagram of a DC system switch closing judgment device. The device includes: a detection module 310, a parameter acquisition module 320, a calculation module 330, a first judgment module 340, and a second judgment module 350, wherein: Detection module 310 is used to detect the operation events of the switch, which is a load bus tie switch or a DC output switch; The parameter acquisition module 320 is used to acquire the output current value and float charge voltage parameter of the first charging device and the second charging device at a predetermined time before the operation in response to detecting that the switch has switched from the first position to the second position. The calculation module 330 is used to obtain the real-time output current values ​​of the first charging device and the second charging device after the operation, and to calculate the change in output current of the first charging device and the second charging device before and after the operation. The first determination module 340 is used to compare the output current change value with the predetermined current change threshold. If the output current change value is greater than the predetermined current change threshold, it is determined that the switch is closed. The second determination module 350 is used to adjust the float charge voltage parameter if any output current change value is less than or equal to a predetermined current change threshold, and to repeatedly acquire and compare the real-time output current value after the operation until the output current change value is greater than the predetermined current change threshold, thus confirming that the switch is closed in place.

[0069] It should be noted that the device embodiments in this invention correspond to the aforementioned method embodiments. The specific principles in the device embodiments can be found in the content of the aforementioned method embodiments, and will not be repeated here.

[0070] In the several embodiments provided in this example, the coupling between modules can be electrical, mechanical, or other forms of coupling.

[0071] Furthermore, the functional modules in the various embodiments of the present invention can be integrated into one processing module, or each module can exist physically separately, or two or more modules can be integrated into one module. The integrated modules described above can be implemented in hardware or as software functional modules.

[0072] Please see Figure 8 , Figure 8 This application provides a structural block diagram of an electronic device 200 that can execute the above-described DC system switch closing judgment method. The electronic device 200 may be a smartphone, tablet computer, computer, or portable computer.

[0073] The electronic device 200 also includes a processor 202 and a memory 204. The memory 204 stores programs that can execute the contents of the foregoing embodiments, and the processor 202 can execute the programs stored in the memory 204.

[0074] The processor 202 may include one or more cores for data processing and message matrix units. The processor 202 connects to various parts within the electronic device 200 using various interfaces and lines, and performs various functions and processes data by running or executing instructions, programs, code sets, or instruction sets stored in the memory 204, and by calling data stored in the memory 204. Optionally, the processor 202 may be implemented using at least one hardware form of Digital Signal Processing (DSP), Field-Programmable Gate Array (FPGA), or Programmable Logic Array (PLA). The processor 202 may integrate one or more of the following: Central Processing Unit (CPU), Graphics Processing Unit (GPU), and modem / decoder. The CPU primarily handles the operating system, user interface, and applications; the GPU is responsible for rendering and drawing the displayed content; and the modem / decoder handles wireless communication. It is understood that the modem / decoder may also be implemented separately as a communication chip, without being integrated into the processor.

[0075] Memory 204 may include random access memory (RAM) or read-only memory (ROM). Memory 204 can be used to store instructions, programs, code, code sets, or instruction sets. Memory 204 may include a program storage area and a data storage area, wherein the program storage area may store instructions for implementing an operating system, instructions for implementing at least one function (e.g., instructions for a user to obtain random numbers), instructions for implementing the various method embodiments described below, etc. The data storage area may also store data (e.g., random numbers) created by the terminal during use.

[0076] Electronic device 200 may also include a network module and a screen. The network module is used to receive and transmit electromagnetic waves, converting electromagnetic waves into electrical signals, thereby enabling communication with communication networks or other devices, such as audio playback devices. The network module may include various existing circuit elements used to perform these functions, such as antennas, radio frequency transceivers, digital signal processors, encryption / decryption chips, SIM cards, memory, etc. The network module can communicate with various networks such as the Internet, corporate intranets, and wireless networks, or communicate with other devices via wireless networks. The aforementioned wireless networks may include cellular telephone networks, wireless local area networks, or metropolitan area networks. The screen can display interface content and facilitate data interaction.

[0077] Please refer to Figure 9 , Figure 9 This diagram illustrates a structural block diagram of a computer-readable storage medium according to an embodiment of this application. The computer-readable storage medium 400 stores program code 410, which can be called by a processor to execute the methods described in the above method embodiments.

[0078] The computer-readable storage medium 400 may be an electronic memory such as flash memory, EEPROM (Electrically Erasable Programmable Read-Only Memory), EPROM, hard disk, or ROM. Optionally, the computer-readable storage medium includes a non-transitory computer-readable storage medium. The computer-readable storage medium 400 has storage space for program code 410 that performs any of the method steps described above. This program code 410 can be read from or written to one or more computer program products. The program code 410 may be compressed, for example, in a suitable form.

[0079] This application also provides a computer program product or computer program, which includes computer instructions stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the computer device to perform a DC system switch closing determination method described in the various optional implementations above.

[0080] 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 foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for determining the closing status of a DC system switch, characterized in that, Applied to a DC system, the DC system including a first charging device, a second charging device, a load bus tie switch, and a DC output switch, the method includes: The operation events of the detection switch are detected; the switch is a load bus tie switch or a DC output switch. In response to detecting that the switch has switched from the first position to the second position, the output current value and float charge voltage parameter of the first charging device and the second charging device are obtained at a predetermined time before the operation. After the operation, obtain the real-time output current values ​​of the first and second charging devices, and calculate the change in output current of the first and second charging devices before and after the operation. Compare the output current change value with a predetermined current change threshold. If the output current change value is greater than the predetermined current change threshold, then it is determined that the switch is closed. If any of the output current changes is less than or equal to the predetermined current change threshold, the float charge voltage parameter is adjusted, and the real-time output current value after the operation is repeatedly acquired and compared until all output current changes are greater than the predetermined current change threshold, confirming that the switch is closed.

2. The method for determining the closing status of a DC system switch according to claim 1, characterized in that, The adjustment of the float charge voltage parameter includes: The float charge voltage parameters are gradually adjusted in predetermined voltage steps until the output current change values ​​are all greater than the predetermined current change threshold. After determining that the circuit breaker is in place, the float charge voltage parameters are restored to their pre-operation values.

3. The method for determining the closing status of a DC system switch according to claim 1, characterized in that, When the switch is a load bus tie switch, the first position is the first load bus position, and the second position is the second load bus position; obtaining the output current values ​​of the first charging device and the second charging device at a predetermined time before operation includes: Read the output current values ​​of the first charging device and the second charging device at the moment before operation.

4. The method for determining the closing status of a DC system switch according to claim 1, characterized in that, When the switch is a DC output switch, the first position is the off position, and the second position is the load bus position; obtaining the output current values ​​of the first and second charging devices at a predetermined time before operation includes: The output current value of the charging device corresponding to the DC output switch is set to zero at the moment before operation.

5. The method for determining the closing status of a DC system switch according to claim 1, characterized in that, The method further includes: When the circuit breaker is closed or an alarm is triggered, a signal indicator light will be activated. This signal needs to be manually reset.

6. The method for determining the closing status of a DC system switch according to claim 2, characterized in that, At least one of the predetermined current change threshold, predetermined voltage step size, or predetermined time is based on DC system tuning.

7. A DC system switch closing judgment device, applied to a DC system, the DC system comprising a first charging device, a second charging device, a load bus tie switch, and a DC output switch, characterized in that, The device includes: The detection module is used to detect the operation events of the switch, which is a load bus tie switch or a DC output switch; The parameter acquisition module is used to acquire the output current value and float charge voltage parameter of the first charging device and the second charging device at a predetermined time before the operation in response to detecting that the switch is switched from the first position to the second position. The calculation module is used to obtain the real-time values ​​of the output current of the first charging device and the second charging device after the operation, and to calculate the change in the output current of the first charging device and the second charging device before and after the operation. The first determination module is used to compare the output current change value with a predetermined current change threshold. If the output current change value is greater than the predetermined current change threshold, it is determined that the switch is closed. The second determination module is used to adjust the float charge voltage parameter if any of the output current change values ​​is less than or equal to the predetermined current change threshold, and to repeatedly obtain and compare the real-time output current values ​​after the operation until all output current change values ​​are greater than the predetermined current change threshold, thus confirming that the switch is closed in place.

8. The DC system switch closing judgment device according to claim 7, characterized in that, The adjustment module is also used to restore the float charge voltage parameter to its pre-operation value after determining that the closing position is in place.

9. An electronic device, characterized in that, The electronic device includes a memory and a processor. The memory stores program code that can run on the processor. When the program code is executed by the processor, it implements a DC system switch closing judgment method as described in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores program code that can be called by one or more processors to execute a DC system switch closing determination method as described in any one of claims 1-7.

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