Method for improving reliability of direct-current measurement equipment of high-voltage direct-current control system

Abstract

The invention belongs to the technical field of high-voltage direct-current control systems, and discloses a high-voltage direct-current control system direct-current measurement equipment reliability improving method which comprises the following steps: S1, replacing a laser energy supply board card of an electronic transformer with a screened board card of the same type; s2, connecting a direct current control host to a redundant merging unit of the action cabinet to form two paths of measurement channels; the method has the following beneficial effects: 1, the laser energy supply board card of the electronic transformer is replaced, the quality of the laser energy supply board card of the electronic transformer is improved from the aspect of hardware, and the equipment failure rate is reduced; 2, the DC control host is provided with two measurement channels, the accuracy of measurement information is ensured, and a slight alarm is given out when one channel is abnormal, so that single-system operation of the DC control host can be avoided; and 3, a measuring channel maintenance soft pressing plate is arranged, so that fault checking and processing of the merging unit laser board card can be facilitated, and exiting of a direct current control host can be avoided.

Description

Technical Field

[0001] This invention relates to the field of high-voltage direct current control system technology, and specifically to a method for improving the reliability of DC measurement equipment in a high-voltage direct current control system. Background Technology

[0002] The high-voltage direct current (HVDC) control system provides control and protection functions for the HVDC transmission system. It monitors the measurement points of the HVDC control system through DC measurement equipment, thereby identifying faults in a timely manner.

[0003] Existing DC measurement equipment has the following disadvantages: Firstly, the reliability of the laser power supply board for electronic instrument transformers is insufficient. The laser power supply board is prone to failure due to poor tolerance during field operation, which in turn leads to the risk of DC system lockout. Secondly, the single measurement channel leads to system vulnerability. The DC control host relies on only a single measurement channel. If the data from the merging unit of that channel is abnormal, the host will directly issue a serious alarm and shut down, causing the DC control host to operate as a single system. Third, the maintenance process is high-risk. When dealing with faulty merging units, the DC control host needs to be shut down to avoid data interference. However, this operation will reduce the reliability of the system and may even lead to the DC system being locked out. Summary of the Invention

[0004] To address the above problems, this invention provides a method for improving the reliability of DC measurement equipment in a high-voltage DC control system. This invention is achieved through the following technical solutions.

[0005] A method for improving the reliability of DC measurement equipment in a high-voltage DC control system includes the following steps: S1, replace the laser power supply board of the electronic current transformer with a selected board of the same type; S2, connect the DC control host to the redundant merging unit of the action cabinet to form two measurement channels: the starter cabinet and the action cabinet; add an optical fiber connection from the merging unit in the action cabinet to the DC control host, and modify the DC control host software to realize measurement quality monitoring and measurement channel switching logic. S3. Set up a measurement channel maintenance soft pressure plate on the DC control host and add a corresponding operation point on the operator's station so that when handling the fault merging unit, the DC control host will not select the data of that channel by putting on the measurement channel maintenance soft pressure plate, and the measurement channel maintenance soft pressure plate will be taken off after the maintenance is completed.

[0006] As a further embodiment of the present invention, in step S1, the measured value of the measuring point in the high voltage DC control system is obtained by the electronic current transformer in the high voltage DC control system.

[0007] As a further aspect of the present invention, in step S1, the method for screening the laser power supply board of the electronic transformer is as follows: in a 40°C oven, the laser's luminous power is increased to 350mW and the oven is continuously heated for 3 days. For lasers that fail on the 3rd day, an additional 1-day heating test is conducted to eliminate potentially early-failure devices.

[0008] As a further embodiment of the present invention, in step S2, the merging unit is a set of measured values ​​of measuring points in the high voltage DC control system.

[0009] As a further embodiment of the present invention, in step S2, each starter cabinet and action cabinet corresponds to three merging units.

[0010] As a further embodiment of the present invention, in step S2, there are two starter cabinets, namely BFT+3 and BFT+7, and two action cabinets, namely BFT+4 and BFT+8. Starter cabinet BFT+3 and action cabinet BFT+4 together with a DC control host form two measurement channels; starter cabinet BFT+7 and action cabinet BFT+8 together with another DC control host form two measurement channels.

[0011] As a further aspect of the present invention, in step S2, for any DC control host, when the merging unit of any measurement channel experiences a data anomaly, it switches to another measurement channel.

[0012] As a further aspect of the present invention, in step S2, for any DC control host, if the merging unit of one of the measurement channels malfunctions, the DC control host sets a minor fault state; if the merging units of both measurement channels malfunction, the DC control host issues a serious alarm and exits.

[0013] As a further aspect of the present invention, in step S3, when any measurement channel is put into the measurement channel maintenance soft pressure plate, the other measurement channel responds to the fault according to the logic of the original single measurement channel.

[0014] As a further aspect of the present invention, in step S3, an interlocking logic is set between the maintenance soft pressure plates of the two measurement channels on the same DC control host to prevent the two measurement channels from being put into operation at the same time.

[0015] The beneficial effects of this invention are as follows: 1. The laser power supply board of the electronic instrument transformer was replaced with a selected board of the same type that is more adaptable to the field operating conditions and has stronger resistance, which improved the operational stability of the merging unit and improved the quality of the laser power supply board of the electronic instrument transformer from the hardware perspective, thus reducing the equipment failure rate.

[0016] 2. The DC control host is connected to the redundant merging unit of the action cabinet to form two measurement channels for the starter cabinet and the action cabinet. If the data of one channel is abnormal, it will automatically switch to the other channel to ensure the accuracy of the measurement information. At the same time, the DC control host will issue a slight alarm to remind the maintenance personnel that there is an abnormality in the channel. Since the slight alarm will not cause the DC control host to shut down, the single-system operation of the DC control host can be avoided.

[0017] 3. The measurement channel maintenance soft pressure plate provides maintenance personnel with a safety measure to minimize the risk when handling faults. It can facilitate the inspection and handling of faults of the laser board of the merge unit, and avoid the need to exit the DC control host. Attached Figure Description

[0018] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the description of the specific embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a wiring diagram of the starter cabinet BFT+3 and the action cabinet BFT+4 in the prior art; Figure 2 This is a wiring diagram of the starter cabinet BFT+7 and the action cabinet BFT+8 in the prior art; Figure 3 This is a wiring diagram of the starter cabinet BFT+3 and the action cabinet BFT+4 in this application; Figure 4 This is a wiring diagram of the starter cabinet BFT+7 and the action cabinet BFT+8 in this application; Figure 5 This is a wiring diagram of the existing DC control host for pole 1; Figure 6 This is a wiring diagram of the existing Pole 2 DC control host; Figure 7 This is a wiring diagram of the DC control host of pole 1 in this application; Figure 8 This is a wiring diagram of the DC control host of pole 2 in this application. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] A method for improving the reliability of DC measurement equipment in a high-voltage DC control system includes the following steps: S1, replace the laser power supply board of the electronic current transformer with a selected board of the same type.

[0022] The measured values ​​at the measuring points in the high-voltage direct current control system are obtained by the electronic instrument transformers in the high-voltage direct current control system.

[0023] The method for screening laser power supply boards for electronic transformers is as follows: In a 40°C oven, the laser's luminous power is increased to 350mW and the oven is continuously heated for 3 days. For lasers that fail on the 3rd day, an additional 1-day heating test is conducted to eliminate potentially early failure devices.

[0024] Replacing the electronic instrument transformer laser power supply board with a selected board of the same type that is better suited to on-site operating conditions and has stronger tolerance improves the operational stability of the merging unit. This hardware improvement enhances the quality of the electronic instrument transformer laser power supply board, reduces the equipment failure rate, and thus reduces the risk of DC system lockout due to board failure.

[0025] S2 connects the DC control host to the redundant merging unit of the action cabinet to form two measurement channels: the starter cabinet and the action cabinet. Add a fiber optic connection from the merging unit in the action cabinet to the DC control host, and modify the DC control host software to realize measurement quality monitoring and measurement channel switching logic.

[0026] The merging unit is a collection of measured values ​​from measuring points in a high-voltage direct current control system.

[0027] Each starter cabinet and action cabinet corresponds to three merging units.

[0028] There are two starter cabinets, namely BFT+3 and BFT+7, and two actuator cabinets, namely BFT+4 and BFT+8. Starter cabinet BFT+3 and actuator cabinet BFT+4 together with a DC control host form two measurement channels; starter cabinet BFT+7 and actuator cabinet BFT+8 together with another DC control host form two measurement channels.

[0029] For any DC control host, when the merging unit of any measurement channel experiences a data anomaly, it switches to another measurement channel.

[0030] For any DC control host, if the merging unit of one measurement channel malfunctions, the DC control host will set to a minor fault state; if the merging units of both measurement channels malfunction, the DC control host will issue a serious alarm and exit.

[0031] like Figure 1 and Figure 2 As shown, in the prior art, the DC control host of pole 1 and the DC control host of pole 2 have only one measurement channel. If the measurement of this channel is abnormal, the corresponding DC control host will issue a serious alarm and exit, which will cause the risk of DC system lockout due to the single system operation of the DC control host.

[0032] like Figure 3 and Figure 4 As shown in this application, the DC control host of pole 1 and the DC control host of pole 2 are connected to the redundant merging unit of the action cabinet. When the data of the merging unit of any measurement channel is abnormal, it switches to another measurement channel to ensure the accuracy of the measurement information. At the same time, the DC control host will issue a slight alarm to remind the maintenance personnel that there is an abnormality in the channel. Since the slight alarm will not cause the DC control host to exit, the single system operation of the DC control host can be avoided.

[0033] Cabinets BFT+3, BFT+4, BFT+7, and BFT+8 each have three merging units, namely merging units H1, H2, and H3. The measurement points in merging unit H1 are UDL, UDN, IDP, IDL, IDNC, IDNE, ICN, and IAN; the measurement points in merging unit H2 are IDGND, IDME, IDEL1, IDEL2, IANE, IDNE_OP, IDL_OP, and UDL_OP; and the measurement points in merging unit H3 are IZ1T1, IZ1T2, IZ1T4, IZ2T1, IZ2T2, IZ2T4, IZ1T4_OP, and IZ2T4_OP.

[0034] like Figures 5-8 As shown, the merging unit of BFT+4 and BFT+8 cabinets is introduced into the spare interfaces of B08 IO2 RX2, B08IO4 RX2, and B12 IO7 RX1 via optical fiber.

[0035] The key points for software operation after modification are as follows (taking IDNC measuring points and pole 1 DC control host as examples): a) If any IDNC measurement point in either BFT+3 or BFT+4 fails, the DC control host of pole 1 will have a minor fault; if both IDNC measurement points in BFT+3 and BFT+4 fail, the DC control host of pole 1 will have a serious fault.

[0036] b) If the fiber optic monitoring of either BFT+3 or BFT+4 in the DC control host of pole 1 is abnormal, the DC control host of pole 1 will have a minor fault; if the fiber optic monitoring of both BFT+3 and BFT+4 in the DC control host of pole 1 is abnormal, the DC control host of pole 1 will have a serious fault.

[0037] c) The IDNC that actually participates in the control logic of the DC control host of pole 1 adopts the following logic: if the IDNC measurement point or fiber optic monitoring of any of the merging units in BFT+3 and BFT+4 is abnormal, the IDNC data is determined to be unavailable; if the IDNC measurement point data of any of the merging units in BFT+3 and BFT+4 is available, the IDNC participating in the control logic will use the available data; if the data of both merging units in BFT+3 and BFT+4 is unavailable or both are available, the IDNC participating in the control logic will default to using the data of any merging unit in BFT+3 and BFT+4.

[0038] S3. Set up a measurement channel maintenance soft pressure plate on the DC control host and add a corresponding operation point on the operator's station so that when handling the fault merging unit, the DC control host will not select the data of that channel by putting on the measurement channel maintenance soft pressure plate, and the measurement channel maintenance soft pressure plate will be taken off after the maintenance is completed.

[0039] When any measurement channel is put into the maintenance soft pressure plate, the other measurement channel responds to the fault according to the logic of the original single measurement channel.

[0040] Interlocking logic is set between the maintenance soft pressure plates of the two measurement channels on the same DC control host to prevent the two measurement channels from being put into operation at the same time.

[0041] The installation of a soft pressure plate for the measurement channel provides a safety measure that minimizes the risk for maintenance personnel when handling faults. It facilitates the inspection and handling of faults in the laser board of the merge unit, avoids the need to disconnect the DC control host, and sets up interlocking logic to prevent the possibility of operator misoperation.

[0042] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention.

Claims

1. A method for improving reliability of a DC measurement device of a high voltage direct current control system, characterized in that, The method comprises the following steps: S1, replacing the laser power supply board of the electronic transformer with a screened same type board; S2, connecting the DC control host to the merging unit of the action cabinet redundancy to form two measurement channels of the starting cabinet and the action cabinet; adding the fiber connection from the merging unit in the action cabinet to the DC control host, and modifying the software of the DC control host to realize the measurement quality monitoring and the measurement channel switching logic; S3, setting the measurement channel maintenance soft pressure plate on the DC control host, and adding the corresponding operation point on the operation station of the operator, so that when the faulty merging unit is processed, the DC control host is ensured not to select the channel data by putting in the measurement channel maintenance soft pressure plate, and the measurement channel maintenance soft pressure plate is exited after the maintenance is completed.

2. The method for improving reliability of DC measurement equipment of a high-voltage direct-current control system according to claim 1, characterized in that, In the step S1, the measurement value of the measurement point in the high-voltage DC control system is measured by the electronic transformer in the high-voltage DC control system.

3. The method of claim 1, wherein the method comprises: In the step S1, the laser power supply board of the electronic transformer is screened in the following way: in a 40°C oven, the laser light power is increased to 350mW and the oven is kept for 3 days, and for the laser that fails on the third day, an additional 1-day oven test is performed to eliminate potential early failure devices.

4. The method of claim 1, wherein the method is used for a high-voltage direct-current control system direct-current measurement device reliability improvement. In the step S2, the merging unit is the collection of the measurement values of the measurement points in the high-voltage DC control system.

5. The method of claim 1, wherein the method is used for a high-voltage direct-current control system direct-current measurement device reliability improvement. In the step S2, each starting cabinet and action cabinet corresponds to three merging units.

6. The method of claim 1, wherein the method is used for a high-voltage direct-current control system direct-current measurement device reliability improvement. In the step S2, the starting cabinet has two, BFT+3 and BFT+7 cabinets, and the action cabinet has two, BFT+4 and BFT+8 cabinets, the starting cabinet BFT+3 and the action cabinet BFT+4 form two measurement channels with one DC control host, and the starting cabinet BFT+7 and the action cabinet BFT+8 form two measurement channels with another DC control host.

7. The method of claim 4, wherein the method further comprises: In the step S2, for any DC control host, when the merging unit of any measurement channel appears data abnormality, the other measurement channel is switched to.

8. The method of claim 1, wherein the method is used for a high-voltage direct-current control system direct-current measurement device reliability improvement. In the step S2, for any DC control host, if the merging unit of one measurement channel appears abnormality, the DC control host sets a slight fault state; if the merging units of both measurement channels appear data abnormality, the DC control host issues a serious alarm and exits.

9. The method of claim 1, wherein the method is a method of improving reliability of a DC measurement device of a high voltage DC control system, and the method comprises: In the step S3, when any measurement channel is put into the measurement channel maintenance soft pressure plate, the other measurement channel responds to the fault according to the original single measurement channel logic.

10. The method of claim 1, wherein the method is used for a high-voltage direct-current control system direct-current measurement device reliability improvement. In the step S3, interlocking logic is set between the measurement channel maintenance soft pressure plates on the two measurement channels of the DC control host to prevent both measurement channels from being put in at the same time.

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