Valve hall discharge positioning method and system

Abstract

The application provides a positioning method and system for valve hall discharge. The valve hall comprises at least one preset area. For any of the preset areas in the valve hall, the positioning method comprises: simulating a minimum discharge amount of the preset area, wherein the minimum discharge amount causes the discharge detection unit to act, and generates an action signal; determining a discharge detection unit for detecting discharge in the preset area according to the action signal of the discharge detection unit; and judging the discharge condition of the preset area according to the action signal generated by the determined discharge detection unit.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of power electronics, in particular, to a positioning method and system for valve hall discharge. BACKGROUND

[0002] Compared with AC power transmission, high-voltage DC power transmission is more economical for long-distance and large-capacity transmission, and has no power angle stability problem, and the power flow is fast controllable, so it is widely used for long-distance transmission of energy base power to economic centers or regional back-to-back networking. High-voltage DC power transmission is a power transmission mode in which three-phase AC power is rectified into DC power through a converter station, and then transmitted to another converter station through a DC transmission line to be converted into three-phase AC power. The converter valve, as the "heart" of the DC power transmission system, is the core equipment of the entire DC project, which realizes AC (alternating current)-DC (direct current) or DC-AC conversion.

[0003] During the operation of the converter valve in the past, various types of discharge faults have occurred, which seriously affect the reliability of the DC power transmission. According to the statistics of the converter station maintenance records in the past ten years, the discharge faults of the converter valve include: optical fiber surface creepage, optical cable slot creepage, damping capacitor connection loosening discharge, damping capacitor installation plate creepage, capacitor column head connecting piece fracture discharge, damping capacitor surface moisture discharge, equalizing resistor and damping capacitor connection line loosening discharge, water electrode connection terminal loosening discharge, etc.

[0004] The converter valve is installed in the valve hall of the converter station, and the valve hall also contains wall bushings, DC bus arrester and various equipment connecting fittings. The valve hall is provided with invisible ultraviolet flame detectors on the four walls, which are used for monitoring the fire and discharge in the valve hall. After the discharge occurs in the valve hall, the flame detector senses the ultraviolet light emitted by the discharge and sends an "ultraviolet xx action" alarm in the background. The current discharge alarm system does not have a discharge positioning function. Some substations are equipped with visible ultraviolet imaging systems, which combine video and ultraviolet detection to better achieve discharge positioning, but the system is expensive, with a price of hundreds of times that of the valve hall ultraviolet flame detection system.

[0005] The above information disclosed in the BACKGROUND section is only for the purpose of enhancing the understanding of the background of the present application, therefore, it can include information that does not constitute prior art known to those of ordinary skill in the art. SUMMARY

[0006] The present application aims to provide a positioning method and system for valve hall discharge, which realizes discharge positioning based on the existing ultraviolet flame detection system of the valve hall.

[0007] According to an aspect of the present application, a positioning method for valve hall discharge is provided, the valve hall comprising at least one preset area, for any one of the preset areas in the valve hall, the positioning method comprises:

[0008] simulate a minimum discharge amount in the preset area, wherein the minimum discharge amount causes the discharge detection unit to act and generate an action signal;

[0009] determine a discharge detection unit for detecting the preset area according to the action signal of the discharge detection unit;

[0010] determine a discharge situation of the preset area according to the action signal generated by the determined discharge detection unit.

[0011] According to some embodiments, the simulation of the minimum discharge amount in the preset area comprises:

[0012] count the types of elements that have discharged in the valve hall;

[0013] obtain the minimum value when each type of element discharges;

[0014] organize the minimum value when each type of element discharges as a first collection.

[0015] According to some embodiments, the simulation of the minimum discharge amount in the preset area further comprises:

[0016] in the case that the preset area includes the types of elements that have discharged, organize the minimum value when each type of element in the preset area discharges as a second collection, and set the minimum value in the second collection as the minimum discharge amount;

[0017] in the case that the preset area does not include the types of elements that have discharged, set the minimum value in the first collection as the minimum discharge amount.

[0018] According to some embodiments, the determination of the discharge situation of the preset area according to the action signal generated by the determined discharge detection unit comprises:

[0019] in response to at least one discharge detection unit in the preset area being in an action and no-fault state, and the rest of the discharge detection units being in an action state or a fault state, determine that the preset area discharges.

[0020] According to some embodiments, in the case of determining that the preset area discharges, output a discharge alarm signal of the preset area.

[0021] According to another aspect of the present application, a positioning system for discharge of a valve hall is provided, the valve hall comprising at least one preset area, the positioning system comprising:

[0022] a discharge simulation generator for simulating a minimum discharge amount in the preset area;

[0023] The discharge detection unit is configured to generate an action signal according to the minimum discharge amount under normal working conditions, or generate a fault signal under fault conditions;

[0024] The signal forwarding device is configured to receive and process the action signal and the fault signal;

[0025] The workstation is configured to receive the action signal forwarded by the signal forwarding device, determine the discharge detection unit for detecting the preset area, generate the action signal and / or the fault signal according to the determined discharge detection unit, determine the discharge condition of the preset area, and output a discharge alarm signal when the discharge condition of the preset area is determined.

[0026] According to some embodiments, the discharge simulation generator comprises two metal electrodes, a current-limiting resistor, a discharge capacitor, a charging resistor, and a power supply, wherein:

[0027] The power supply, the charging resistor, and the discharge capacitor are connected in series;

[0028] The two metal electrodes and the current-limiting resistor are connected in series and then connected in parallel with the discharge capacitor.

[0029] According to some embodiments, different discharge amounts of the discharge simulation generator correspond to different power supply voltages or distances between the two metal electrodes.

[0030] According to some embodiments, the discharge detection unit comprises:

[0031] An ultraviolet light detection unit and a photoelectric conversion circuit connected in series; or

[0032] An ultraviolet light detection unit and a light transmission circuit connected in series.

[0033] According to some embodiments, the signal forwarding device comprises:

[0034] An electrical signal receiving unit or an optical signal receiving unit, a signal processing unit, and a communication unit connected in series.

[0035] According to some embodiments, the workstation comprises:

[0036] A communication unit, a logic processing module, and an alarm display interface.

[0037] According to some embodiments of the technical solutions of the present application, one or more of the following beneficial effects can be achieved:

[0038] 1. The existing invisible ultraviolet flame detection system in the valve hall is used to realize the advanced function of discharge positioning, effectively improve the maintenance pertinence, and effectively reduce the cost of realizing the advanced function without adding expensive visible ultraviolet imaging equipment.

[0039] 2. In each preset area, simulate the minimum discharge amount instead of other discharge amounts to obtain the discharge detection unit number corresponding to the action of that area. This ensures that as long as the preset area discharges, the corresponding discharge detection unit will definitely be activated, ensuring that the discharge judgment logic in the steps can be correctly executed to determine the discharge area.

[0040] 3. The generation of the discharge alarm signal requires the joint participation of the action signal and the fault signal of the discharge detection unit, which can effectively avoid missed alarms; when the discharge detection units related to the discharge alarm signal are all in a fault state, the discharge alarm is shielded, which can effectively avoid false alarms.

[0041] 4. The discharge simulation generator changes the discharge quantity by adjusting either the power supply voltage or the distance between the two metal electrodes, making it flexible and simple to implement.

[0042] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this application. Attached Figure Description

[0043] The above and other objects, features, and advantages of this application will become more apparent from the detailed description of exemplary embodiments with reference to the accompanying drawings. The drawings described below are merely some embodiments of this application and are not intended to limit the scope of this application.

[0044] Figure 1 A flowchart illustrating a valve hall discharge positioning method of an exemplary embodiment is shown;

[0045] Figure 2 A schematic diagram of a valve hall discharge positioning system of an exemplary embodiment is shown;

[0046] Figure 3 A schematic diagram of the structure of a discharge simulation generator according to an exemplary embodiment is shown. Detailed Implementation

[0047] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this application will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted.

[0048] The described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the technology can be practiced without one or more of the specific details, or with other methods, components, materials, and so forth. In some instances, detailed descriptions of well-known structures, methods, devices, materials, and so forth are omitted so as to not obscure the disclosure with unnecessary detail.

[0049] The flowcharts shown in the drawings are only illustrative, and do not necessarily include all the contents and operations / steps, nor are they necessarily executed in the order described. For example, some operations / steps can be further decomposed, and some operations / steps can be combined or partially combined, so the actual execution order can be changed according to actual conditions.

[0050] The terms "first", "second", and so on in the specification and claims of the present application and the above drawings are used to distinguish different objects, and are not used to describe a specific order. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but can optionally include steps or units not listed, or can optionally include other steps or units inherent to the process, method, product, or device.

[0051] Those skilled in the art can understand that the drawings are only schematic diagrams of example embodiments, and the modules or flows in the drawings are not necessarily required for implementing the present application, and therefore cannot be used to limit the protection scope of the present application.

[0052] Figure 1 A flowchart of a valve hall discharge positioning method according to an example embodiment is shown.

[0053] Step S101: Count the types of elements that have discharged in the valve hall, and obtain the minimum discharge amount corresponding to discharge of each type of element.

[0054] According to an example embodiment, the types of elements that have discharged in the valve hall are element type 1, …, element type N; the minimum discharge amount corresponding to discharge of element type 1 is minimum discharge amount 1, …, and the minimum discharge amount corresponding to discharge of element type N is minimum discharge amount n.

[0055] Step S102: Divide all areas in the valve hall into a plurality of preset areas, and obtain the minimum discharge amount when discharge occurs in each preset area.

[0056] According to the example embodiment, if the preset area contains element types that have occurred discharge, then all element types that have occurred discharge in the preset area are counted, and the minimum discharge amount of each type of element is taken as the minimum discharge amount of the preset area.

[0057] According to the example embodiment, if the preset area does not contain element types that have occurred discharge, then the minimum value of the minimum discharge amount of all types of elements in step S101 is taken as the minimum discharge amount of the preset area.

[0058] According to the example embodiment, in each preset area, the discharge of the minimum discharge amount is simulated instead of the discharge of other sizes to obtain the discharge detection unit number corresponding to the action of the area, which ensures that as long as the preset area discharges, the discharge detection units corresponding to the area will definitely act, and which ensures that the discharge judgment logic in the step can correctly execute the judgment of the discharge area.

[0059] Step S103: Simulate the discharge of the minimum discharge amount of each preset area.

[0060] According to the example embodiment, when the converter valve is inoperable, in each preset area, a discharge simulation generator is used to simulate the discharge of the minimum discharge amount of the area.

[0061] According to the example embodiment, the discharge simulation generator simulates the discharge of the minimum discharge amount of the area, and the discharge causes Y discharge detection units in the valve hall to act, where Y≥1, and the Y action discharge detection unit numbers corresponding to the discharge of each preset area are recorded.

[0062] According to the example embodiment, the discharge detection unit numbers corresponding to the discharge of the preset area Ya are a1, …, ag; …; and the discharge detection unit numbers corresponding to the discharge of the preset area Yk are k1, …, km.

[0063] Step S104: Discharge positioning of the valve hall.

[0064] According to the example embodiment, after the converter valve is put into operation, at least one of the discharge detection units corresponding to the discharge of a preset area is in an action state and has no fault state, and the rest must be in an action state or a fault state, which determines that the preset area discharges, and the discharge positioning system outputs the preset area discharge alarm signal.

[0065] According to the example embodiment, the signal of the action of the discharge detection unit k1 and the signal of the fault of the discharge detection unit k1 are obtained by taking or, and the signal S1041 is obtained by taking or of the signals of the action of the discharge detection unit km and the fault of the discharge detection unit km.

[0066] The signals S1041, …, S104m are obtained by taking or.

[0067] The signals S1061 of the discharge detection unit faults numbered k1, …, km are taken or, and the signals S1061 are taken not after the taking or, and the preset area Yk discharge alarm signal is outputted.

[0068] The signals S1051 and the signals S1061 are taken and, and the preset area Yk discharge alarm signal is outputted.

[0069] According to the example embodiment, the generation of the discharge alarm signal needs the action signal and the fault signal of the discharge detection unit to participate together, which can effectively avoid the false negatives; when the discharge detection units related to the discharge alarm signal are all in the fault state, the discharge alarm is shielded, which can effectively avoid the false positives.

[0070] Figure 2 A schematic diagram of a valve hall discharge positioning system according to an example embodiment is shown.

[0071] For Figure 1 A valve hall discharge positioning method according to an example embodiment is shown, and the application further provides a valve hall discharge positioning method system, as shown in Figure 2 The valve hall discharge positioning system includes a discharge simulation generator 201, a discharge detection unit 202, a signal forwarding device 203, and a workstation 204.

[0072] The discharge simulation generator 201 is used to generate discharge signals of different minimum discharge amounts in a preset area.

[0073] The discharge detection unit 202, when in a normal state, if a discharge occurs in the valve hall, the discharge position and the discharge amount are within the detection range of the discharge detection unit 202, under normal working conditions, the discharge detection unit 202 acts, and sends the action signal to the signal forwarding device 203; or under fault conditions, the discharge detection unit 202 fails, generates a fault signal, and sends the fault signal to the signal forwarding device 203. The discharge detection unit 202 includes an ultraviolet light detection unit, a photoelectric conversion circuit, or a light transmission circuit.

[0074] The signal forwarding device 203 is used to receive and process the action signal and the fault signal generated by the discharge detection unit 202, and then forward them to the workstation 204.

[0075] If the discharge detection unit 202 includes an ultraviolet light detection unit and a photoelectric conversion circuit, the signal forwarding device 203 includes an electric signal receiving unit, a signal processing unit, and a communication unit.

[0076] If the discharge detection unit 202 includes an ultraviolet light detection unit and a photoelectric conversion circuit, the signal forwarding device 203 includes an electric signal receiving unit, a signal processing unit, and a communication unit.

[0077] The workstation 204 receives the action signal and / or the fault signal forwarded by the signal forwarding device 203, and determines the discharge detection unit 202 in the preset area. The discharge logic for the preset area determines the discharge condition of the preset area according to the action signal and / or the fault signal generated by the determined discharge detection unit 202 in actual use; and outputs the discharge alarm signal in the case that the discharge condition of the preset area is determined.

[0078] According to the example embodiment, the workstation 204 comprises a communication unit, a logic processing module, and an alarm display interface.

[0079] According to the example embodiment, the application uses the existing invisible ultraviolet flame detection system in the valve hall to realize the advanced function of discharge positioning, effectively improves the maintenance pertinence, does not need to add expensive visible ultraviolet imaging equipment, and effectively reduces the implementation cost of the advanced function.

[0080] Figure 3 A structural schematic diagram of a discharge simulation generator according to an example embodiment is shown.

[0081] As shown in Figure 3 , the discharge simulation generator 201 comprises two metal electrodes 2015 and 2016 close to each other, a current-limiting resistor 2014, a discharge capacitor 2013, a charging resistor 2012, and a power supply 2011.

[0082] According to some embodiments, the power supply 2011 comprises an alternating current input end and a rectifier bridge, but the application is not limited thereto.

[0083] According to the example embodiment, the power supply 2011, the charging resistor 2012, and the discharge capacitor 2013 are connected in series, and the two metal electrodes 2015 and 2016 close to each other and the current-limiting resistor 2014 are connected in series and then connected in parallel with the discharge capacitor 2013.

[0084] The two metal electrodes 2015 and 2016 close to each other generate discharge when the potential between the two ends is greater than the end-to-end air gap withstand voltage; the discharge amount is changed by adjusting the voltage of the power supply 2011 or the distance between the two metal electrodes 2015 and 2016, and the means is flexible and the method is simple.

[0085] According to the example embodiment, the minimum discharge amount in each preset area is simulated by the discharge simulation generator 201, and the corresponding probe number set in each preset area is obtained, so that the discharge area can be accurately positioned according to the action of the probe number in actual use.

[0086] It should be clearly understood that the application describes how to form and use specific examples, but the application is not limited to any details of these examples. On the contrary, based on the teachings of the disclosure of the application, these principles can be applied to many other embodiments.

[0087] Furthermore, it is to be noted that the above-described diagrams are only schematic representations of the processes included in the method according to the exemplary embodiments of the present application, and are not intended to limit the purpose. It is readily understood that the processes shown in the above-described diagrams do not indicate or limit the chronological order of the processes. In addition, it is readily understood that the processes can be executed, for example, synchronously or asynchronously in a plurality of modules.

[0088] The exemplary embodiments of the present application are specifically shown and described above. It is to be understood that the present application is not limited to the detailed construction, arrangements, or implementation methods described herein; rather, the present application is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. A method for locating discharge in a valve hall, wherein the valve hall includes at least one preset area, characterized in that, For any of the preset areas in the valve hall, the positioning method includes: Determine the minimum discharge quantity of the preset area, wherein the minimum discharge quantity is capable of triggering the discharge detection unit to activate and generate an activation signal, including: The types of components that experienced over-discharge within the valve chamber were statistically analyzed. Obtain the minimum value when each of the aforementioned component types discharges; The minimum values ​​during discharge for each of the aforementioned component types are compiled into a first set; In the case where the preset area includes the component type that has been over-discharged, the minimum values ​​when each component type in the preset area is discharged are compiled into a second set, and the minimum value in the second set is set as the minimum discharge amount; If the preset area does not include the component type that has been over-discharged, the minimum value in the first set is set to the minimum discharge amount; When the valve hall is shut down, a discharge simulation generator is used to simulate the minimum discharge amount in the preset area to trigger the discharge detection unit to activate. The number of the activated discharge detection unit is determined, and the activated discharge detection unit is the discharge detection unit corresponding to the current preset area. After the valve hall is put into operation, the discharge detection unit used to detect the corresponding preset area is determined according to the number of the discharge detection unit; The discharge status of the corresponding preset area is determined based on the action signal generated by the determined discharge detection unit within the preset area.

2. The positioning method as described in claim 1, characterized in that, The step of determining the discharge status of the corresponding preset area based on the action signal generated by the determined discharge detection unit within the preset area includes: In response to at least one discharge detection unit in the preset area being in an active and fault-free state, while the remaining discharge detection units are in an active or faulty state, it is determined that the preset area is discharging.

3. The positioning method as described in claim 1 or 2, further comprising: If the preset area is determined to be discharged, the preset area discharge alarm signal is output.

4. A positioning system for valve hall discharge, the valve hall comprising at least one preset area, characterized in that, The positioning system is used to perform the positioning method as described in any one of claims 1-3, and the positioning system comprises: A discharge simulation generator is used to simulate the generation of a minimum discharge quantity in the preset area to trigger the operation of a discharge detection unit. The number of the activated discharge detection unit is determined, and the activated discharge detection unit is the discharge detection unit corresponding to the current preset area. The preset area includes component types that have experienced over-discharge. By statistically analyzing the component types that have experienced over-discharge in the valve hall, the minimum value when each component type discharges is obtained. The minimum values ​​when each component type discharges are compiled into a first set. If the preset area includes the component types that have experienced over-discharge, the minimum values ​​when each component type discharges in the preset area are compiled into a second set. The minimum value in the second set is determined to be the minimum discharge quantity. Alternatively, if the preset area does not include the component types that have experienced over-discharge, the minimum value in the first set is determined to be the minimum discharge quantity. The discharge detection unit, after the valve hall is put into operation, is used to generate an action signal based on the discharge within the preset area when the discharge detection unit is working normally; or, in the event of a malfunction of the discharge detection unit, it is used to generate a fault signal. A signal forwarding device receives and processes the action signal and the fault signal; The workstation receives the action signal forwarded by the signal forwarding device, determines whether the discharge detection unit used to detect the corresponding preset area has generated an action signal or a fault signal according to the number of the discharge detection unit; determines the discharge status of the preset area based on the determined action signal and / or fault signal generated by the discharge detection unit; and outputs a discharge alarm signal if it is determined that there is a discharge in the preset area.

5. The positioning system as described in claim 4, characterized in that, The discharge simulation generator includes two metal electrodes, a current-limiting resistor, a discharge capacitor, a charging resistor, and a power supply, wherein: The power supply, the charging resistor, and the discharging capacitor are connected in series; The two metal electrodes and the current-limiting resistor are connected in series and then in parallel with the discharge capacitor.

6. The positioning system as described in claim 5, wherein, The different power supply voltages or the different distances between the two metal electrodes correspond to different discharge quantities of the discharge simulation generator.

7. The positioning system as described in claim 4, characterized in that, The discharge detection unit includes: The ultraviolet light detection unit and the photoelectric conversion circuit are connected in series; or The ultraviolet light detection unit and the light transmission circuit are connected in series.

8. The positioning system as described in claim 4, characterized in that, The signal forwarding device includes: A series-connected electrical signal receiving unit, signal processing unit, and communication unit; or An optical signal receiving unit, a signal processing unit, and a communication unit are connected in series.

9. The positioning system as described in claim 4, characterized in that, The workstation includes: Communication unit, logic processing module and alarm display interface.

Images