Method and device for handling black module faults during commutator valve start-up

Abstract

The application provides a method and device for disposing black module failure in converter valve starting, the method comprising: issuing a bypass instruction to a corresponding failure submodule when detecting black module failure in converter valve starting; and taking the following hierarchical disposal measures on the converter valve according to a preset time schedule and state feedback of the failure submodule: if the failure submodule communication is restored and successfully bypassed within a first preset time period, automatically removing the operation limit of the converter valve; if the failure submodule communication is not restored or is restored but not successfully bypassed within the first preset time period, manually removing the operation limit of the converter valve when the failure submodule meets a preset condition; and if the failure submodule does not meet the preset condition within a second preset time period, prohibiting the converter valve from being unlocked. The application helps to improve the safety and convenience of "black module" problem disposal, saves maintenance time, and reduces converter valve outage time.

Description

Technical Field

[0001] This invention relates to the field of DC power transmission technology, and in particular to a method and apparatus for handling a black module failure during converter valve startup. Background Technology

[0002] During the converter valve startup process, the capacitor of the converter valve submodule charges, and the capacitor voltage rises from 0 to the operating voltage USM. Simultaneously, the startup process involves establishing communication between the submodule and the valve control system. After communication is established, the valve control system tracks the communication relationship with the submodule. If communication is lost for more than a specified period, it is considered a black module fault, meaning that from the valve control system's perspective, all information within the submodule is unknown.

[0003] When a black module failure occurs, the sub-module capacitor charging continues. There are two possible scenarios: (1) If the communication between the sub-module and the valve control is restored before the sub-module capacitor finishes charging, then the black module failure can be considered to have disappeared and the sub-module has returned to normal; (2) If the communication between the sub-module and the valve control has not been restored when the sub-module capacitor finishes charging, then the black module failure can be considered to have persisted and the sub-module cannot return to normal.

[0004] Currently, there are two methods for handling black module failures during converter valve charging:

[0005] The first approach is to immediately issue a bypass command after a black module failure occurs, and not allow restarting regardless of whether communication is re-established. If communication is established (i.e., the black module failure disappears) and a bypass feedback signal from the submodule is received, no maintenance is necessary; if communication is never established (i.e., the submodule remains in a black module failure state), maintenance is required to confirm whether the submodule can be reliably bypassed.

[0006] The second approach is to not issue a bypass command after a black module failure occurs, while allowing a period of waiting during the converter valve charging process. If the black module failure disappears, communication is re-established, allowing the submodule to be put into system operation; if the black module failure persists, maintenance is required, and the submodule is manually bypassed.

[0007] However, both of the above methods have their own drawbacks:

[0008] The first method proposes that if communication is established (the black module fault disappears) and a bypass signal from the submodule is received, maintenance is unnecessary. However, the valve control system remains in a "prohibited unlocking" state and cannot be directly switched to unlocking and restarting. The system still needs to be powered off and restarted. Although this avoids entering the valve hall and climbing the tower for inspection, it involves a large number of switching operations. If no bypass signal is received after communication is established, the system needs to be switched to maintenance. The maintenance process requires the system to be powered off first, then switched to maintenance, involving a large number of switching operations and climbing the valve tower. Finally, power is restored, and the entire process requires manpower and time costs.

[0009] The second approach suggests that the submodule can continue operating after the black module's fault disappears. However, given that the cause of the black module's failure is unclear, it could potentially pose a risk to subsequent operation. Summary of the Invention

[0010] In view of this, the present invention provides a method and apparatus for handling a black module failure during the startup of a converter valve, in order to solve at least one of the aforementioned problems.

[0011] To achieve the above objectives, the present invention adopts the following solution:

[0012] According to a first aspect of the present invention, a method for handling a black module failure during the startup of a converter valve is provided. The method includes: when a black module failure is detected during the startup of the converter valve, a bypass command is issued to the corresponding faulty submodule; based on a preset time sequence and the status feedback of the faulty submodule, the following graded handling measures are taken for the converter valve: if the communication of the faulty submodule is restored and bypass is successfully completed within a first preset time period, the operation restriction of the converter valve is automatically lifted; if the communication of the faulty submodule is not restored within the first preset time period, or the communication is restored but bypass is not successful, the operation restriction of the converter valve is manually lifted within a second preset time period when the faulty submodule meets a preset condition, wherein the second preset time period is longer than the first preset time period; if the faulty submodule does not meet the preset condition within the second preset time period, the converter valve is prohibited from unlocking, and the valve tower is awaited to be de-energized for manual inspection of the faulty submodule at the valve tower.

[0013] As an embodiment of the present invention, in the above method, when the faulty submodule meets the preset conditions within the second preset time period, the operation restriction of the converter valve is manually lifted. This includes: when the faulty submodule's communication is restored, it is successfully bypassed, and the capacitor voltage drops within the second preset time period, the operation restriction of the converter valve is manually lifted.

[0014] As an embodiment of the present invention, in the above method, the communication of the faulty submodule is restored within a second preset time period. If the bypass is unsuccessful or the capacitor voltage does not drop, and if the faulty submodule is equipped with a bent thyristor, a bypass command is sent to the faulty submodule again. If the faulty submodule successfully bypasses and the capacitor voltage drops after the bypass command is sent again, the operation restriction of the converter valve is manually lifted.

[0015] As an embodiment of the present invention, in the above method, if the faulty submodule does not meet the preset conditions within the second preset time period, the converter valve is prohibited from unlocking, and the valve tower is de-energized for manual inspection of the faulty submodule. This includes: if the communication of the faulty submodule is not restored within the second preset time period, or if the communication is restored but a bent thyristor is not equipped without successful bypass or capacitor voltage drop, or if the faulty submodule still fails to bypass or capacitor voltage drop after a bypass command is issued again, the converter valve is prohibited from unlocking, and the valve tower is de-energized for manual inspection of the faulty submodule.

[0016] As an embodiment of the present invention, the above method for issuing bypass instructions to the corresponding faulty submodule includes: determining whether there are multiple submodules corresponding to the black module fault; if so, issuing the first bypass instruction to the corresponding submodule according to the set priority.

[0017] As an embodiment of the present invention, the above method further includes: during a preset period of the converter valve starting charging process, monitoring the uplink communication between the submodule and the valve control unit; if the communication interruption time exceeds a preset threshold, determining that a black module fault has occurred; the preset period is located at the end of the uncontrolled charging stage.

[0018] As an embodiment of the present invention, the above method further includes: before the converter valve is started, pre-detecting the communication links of all sub-modules; if an abnormality is found in the communication link, bypassing operation or replacing the sub-module is performed in advance.

[0019] As an embodiment of the present invention, after the converter valve is unlocked and enters normal operation, the above method further includes: for submodules that have experienced black module failure, increasing the monitoring frequency and data sampling rate of the corresponding operating parameters, while reducing the corresponding alarm threshold.

[0020] As an embodiment of the present invention, the above method further includes: using a high-speed data cache to record the operating data of each submodule within a preset time period before the black module fault detection, including the submodule output voltage, the current flowing through the submodule, and the internal temperature of the submodule; when a black module fault is detected in a submodule, extracting the cached data of the corresponding submodule within the preset time period before the fault occurs; using the cached data to calculate the voltage change rate, current change rate, and heating rate of the corresponding submodule, providing a basis for subsequent maintenance.

[0021] According to a second aspect of the present invention, a handling device for a black module failure during the startup of a converter valve is provided. The device includes: a bypass command issuing unit, used to issue a bypass command to the corresponding faulty submodule when a black module failure is detected during the startup of the converter valve; and a graded handling unit, used to take the following graded handling measures for the converter valve according to a preset time process and the status feedback of the faulty submodule: if the communication of the faulty submodule is restored and bypass is successfully completed within a first preset time period, the operation restriction of the converter valve is automatically lifted; if the communication of the faulty submodule is not restored within the first preset time period, or the communication is restored but bypass is not successful, the operation restriction of the converter valve is manually lifted within a second preset time period when the faulty submodule meets a preset condition, wherein the second preset time period is longer than the first preset time period; if the faulty submodule does not meet the preset condition within the second preset time period, the converter valve is prohibited from unlocking, and the valve tower is de-energized for manual inspection of the faulty submodule at the valve tower.

[0022] As an embodiment of the present invention, the step of manually lifting the operation restriction of the converter valve when the faulty submodule meets the preset conditions during the second preset time period includes: when the faulty submodule's communication is restored, it is successfully bypassed, and the capacitor voltage drops during the second preset time period, the operation restriction of the converter valve is manually lifted.

[0023] As an embodiment of the present invention, during the second preset time period, the communication of the faulty submodule is restored. If the bypass is not successful or the capacitor voltage does not drop, and if the faulty submodule is equipped with a bent thyristor, a bypass command is sent to the faulty submodule again. If the faulty submodule successfully bypasses and the capacitor voltage drops after the bypass command is sent again, the operation restriction of the converter valve is manually lifted.

[0024] As an embodiment of the present invention, the step of prohibiting the unlocking of the converter valve and waiting for the valve tower to be de-energized and for manual inspection of the faulty submodule during the second preset time period includes: if the communication of the faulty submodule is not restored during the second preset time period, or if the communication is restored but a bending thyristor is not equipped without successful bypass or capacitor voltage drop, or if the faulty submodule still fails to bypass or capacitor voltage drop after a bypass command is issued again, the converter valve is prohibited from unlocking and the valve tower is de-energized and for manual inspection of the faulty submodule.

[0025] As an embodiment of the present invention, the bypass instruction issuing unit is specifically used to: determine whether there are multiple sub-modules corresponding to the black module failure; if so, issue the first bypass instruction to the corresponding sub-modules according to the set priority.

[0026] As an embodiment of the present invention, the above-mentioned device further includes: a fault monitoring unit, used to monitor the uplink communication between the submodule and the valve control unit during a preset period of the converter valve starting charging process; if the communication interruption time exceeds a preset threshold, it is determined that a black module fault has occurred, wherein the preset period is located at the end of the uncontrolled charging stage.

[0027] As an embodiment of the present invention, the above-mentioned device further includes: a pre-detection unit, used to pre-detect the communication links of all sub-modules before the converter valve is started, and if an abnormality is found in the communication link, to perform a bypass operation or replace the sub-module in advance.

[0028] As an embodiment of the present invention, the above-mentioned device further includes: a parameter adjustment unit, used to increase the monitoring frequency and data sampling rate of the corresponding operating parameters for submodules that have experienced black module failures after the converter valve is unlocked and enters normal operation, while reducing the corresponding alarm threshold.

[0029] As an embodiment of the present invention, the above-mentioned device further includes: a data recording unit, used to record the operating data of each submodule within a preset time period before the black module fault detection using a high-speed data buffer, including the submodule output voltage, the current flowing through the submodule, and the internal temperature of the submodule; a data extraction unit, used to extract the cached data of the corresponding submodule within the preset time period before the fault occurs when a black module fault is detected; and a parameter calculation unit, used to calculate the voltage change rate, current change rate, and heating rate of the corresponding submodule using the cached data, so as to provide a basis for subsequent maintenance.

[0030] According to a third aspect of the present invention, an electronic device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the above-described method.

[0031] According to a fourth aspect of the present invention, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a processor, implements the steps of the above-described method.

[0032] According to a fifth aspect of the present invention, a computer program product is provided, comprising a computer program / instructions that, when executed by a processor, implement the steps of the above-described method.

[0033] The method and apparatus for handling black module failures during converter valve startup proposed in this invention help improve the safety and convenience of handling "black module" problems and save maintenance time. By improving maintenance efficiency, the power outage time of the converter valve is reduced, thereby increasing the utilization rate of new energy sources and the energy availability rate of the converter station. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the 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. In the drawings:

[0035] Figure 1 This is a flowchart illustrating a method for handling a black module failure during the startup of a converter valve, as provided in an embodiment of this application.

[0036] Figure 2 This is a schematic diagram of the structure of a converter valve provided in an embodiment of this application;

[0037] Figure 3 This is a timing diagram of the converter valve start-up charging process provided in an embodiment of the present invention;

[0038] Figure 4 This is a flowchart illustrating a method for handling a black module failure during the startup of a converter valve, provided in another embodiment of this application.

[0039] Figure 5 This is a flowchart illustrating the application of data prior to a black module failure provided in an embodiment of this application.

[0040] Figure 6 This is a schematic diagram of a device for handling a black module failure during the startup of a converter valve, provided in an embodiment of this application.

[0041] Figure 7 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Here, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0043] like Figure 1 The diagram shown is a flowchart illustrating a method for handling a black module failure during the startup of a converter valve, according to an embodiment of this application. This embodiment describes the application from the perspective of the valve control system. The method includes the following steps:

[0044] Step S101: When a black module fault is detected during the start-up of the converter valve, a bypass command is sent to the corresponding faulty submodule.

[0045] like Figure 2 The diagram shown is a structural schematic of a converter valve, consisting of... Figure 2 As can be seen, the converter valve includes multiple submodules (SM1-SMN). During the converter valve startup process, the valve control system monitors the communication status with each submodule in real time. When the communication interruption time between a submodule and the valve control system exceeds a preset threshold, it is determined that the submodule has experienced a black module failure. The valve control system immediately issues the first bypass command to the faulty submodule, attempting to switch the submodule to bypass mode. The first bypass command should be issued as early as possible to quickly determine whether the submodule can bypass. The bypass command is issued through the control signals of the valve control system to ensure that the command is accurately transmitted to the target submodule.

[0046] Therefore, preferably, the method of this embodiment further includes: during a preset period of the converter valve starting charging process, monitoring the uplink communication between the submodule and the valve control unit; if the communication interruption time exceeds a preset threshold, it is determined that a black module fault has occurred, and the preset period is located at the end of the uncontrolled charging stage.

[0047] like Figure 3 The diagram shown is a timing diagram of the converter valve's startup charging process, which includes two stages: an uncontrolled charging stage and a controlled charging stage, wherein:

[0048] 0~t0: Uncontrolled charging stage. The sub-module board completes its self-test and only has hardware overvoltage protection function.

[0049] t0~t1: Uncontrolled charging phase, submodule bypass energy storage is established, enabling bypass capability. Black module detection occurs at the end of this phase, lasting 1 second (Δt). If the uplink communication interruption time exceeds t... d If so, it is considered that a black module failure has occurred.

[0050] t1~t2: During the active charging phase, the submodule bypass switch is ready to bypass, and all protection functions are enabled. At time t2, the converter valve has completed charging.

[0051] The total charging time is t. SUM =t1+t2.

[0052] Step S102: Based on the preset time schedule and the status feedback of the faulty submodule, the following graded handling measures are taken for the converter valve:

[0053] Step S1021: If the communication of the faulty submodule is restored and bypass is successfully completed within the first preset time period, the operation restriction of the converter valve is automatically lifted.

[0054] The first preset time in this step is a relatively short observation window. Within this short observation window, if the faulty submodule and the valve control system re-establish a valid communication connection, and the valve control system receives a confirmation signal from the faulty submodule that the bypass switch is closed, the system will automatically release the operating restrictions of the converter valve. Specifically, this means automatically resetting the black module identifier and the set valve group ready signal, allowing the converter valve to release its locked state and continue to start or be put into operation. This allows for rapid system recovery and avoids unnecessary downtime and maintenance.

[0055] Step S1022: If the communication of the faulty submodule is not restored within the first preset time period, or the communication is restored but the bypass is not successful, then within the second preset time period, when the faulty submodule meets the preset conditions, the operation restriction of the converter valve is manually lifted. The second preset time period is longer than the first preset time period.

[0056] If the problem cannot be resolved within the first preset time period—that is, if communication with the faulty submodule is not restored, or if communication with the faulty submodule is restored but no bypass success signal is received—the system will enter a longer observation and handling window, namely the "second preset time period." During this longer period, if specific "preset conditions" are met, manual intervention is required to determine and operate the system to remove the operational restrictions on the converter valve. Specifically, this involves remotely resetting the energized black module indicator and the ready signal of the set valve group, allowing the converter valve to release its locked state and continue startup or operation.

[0057] Preferably, in this step, when the faulty submodule meets the preset conditions within the second preset time period, the manual release of the operating restriction of the converter valve includes: when the faulty submodule's communication is restored, it is successfully bypassed, and the capacitor voltage drops within the second preset time period, the operating restriction of the converter valve is manually released.

[0058] In this step, an auxiliary judgment condition of "capacitor voltage drop" is added to determine whether the bypass is truly successful. As mentioned earlier, this application did not include this condition in step S1021 to determine whether the bypass was truly successful because the goal of this application is system efficiency within the first preset time period. If the communication of the submodule can be quickly restored and the bypass command is also shown to have been successfully executed (bypass switch closed signal received), the system tends to consider it a temporary minor problem that can be quickly and automatically resolved, thereby minimizing the impact on the converter valve startup process and potential downtime. In specific settings, the first preset time period can be set to a small value, while detecting whether the capacitor voltage has stabilized requires a certain amount of time (sampling, filtering, threshold judgment, etc.), which may slow down the automatic recovery speed, thus violating the original intention of rapid recovery.

[0059] If a fault fails to resolve automatically within the first preset time period, it indicates that the problem may be more complex than expected, or not a simple temporary communication interruption. At this point, the system's handling strategy shifts from "rapid automatic" to "cautious manual." In this stage, the primary goals are safety and accuracy. Human intervention requires more sufficient and reliable evidence to ensure the correctness of the operation and avoid more serious problems due to misjudgment. Therefore, the auxiliary judgment condition of "capacitor voltage drop" is added here. Furthermore, after entering the second preset time period, there is more time available, allowing the system more time to collect and analyze voltage data for more detailed judgment.

[0060] In a further preferred embodiment, during the second preset time period in this step, if the communication of the faulty submodule is restored but the bypass is unsuccessful or the capacitor voltage does not drop, and if the faulty submodule is equipped with a bent thyristor, a bypass command is sent to the faulty submodule again. If the faulty submodule successfully bypasses and the capacitor voltage drops after the bypass command is sent again, the operation restriction of the converter valve is manually lifted.

[0061] This step addresses a more complex situation: although communication has been restored, the bypass command's execution is unsatisfactory (bypass failed or capacitor voltage did not drop). Within the second preset time period, communication with the faulty submodule has been restored, but any of the following conditions occur:

[0062] 1. No signal was received that the bypass switch was closed (bypass failed).

[0063] 2. Alternatively, although a closing signal was received, the capacitor voltage did not drop significantly (the bypass may not be fully effective or there may be other problems).

[0064] At this point, the system will first determine whether the faulty submodule is equipped with a "bent thyristor." If it is, the system allows a bypass command to be issued to the faulty submodule again, attempting to use the bent thyristor to assist in the bypass operation. This is because a bent thyristor is a special thyristor installed inside a submodule within a converter valve. Its main function is to provide a backup, reliable current bypass path when the main switching device (e.g., IGBT) or main bypass switch of the submodule fails. When the first attempt to bypass the faulty submodule via the main bypass switch fails (e.g., the system does not receive a confirmation signal that the bypass switch is closed, or the submodule's capacitor voltage does not drop as expected), if the submodule is equipped with a bent thyristor, it provides an additional possibility for fault handling, thus allowing for another bypass opportunity.

[0065] If the faulty submodule is successfully bypassed and the capacitor voltage drops after the command is issued again, then the conditions for manually lifting the restriction are met, and the operator can then perform the operation.

[0066] Step S1023: If the faulty submodule does not meet the preset conditions within the second preset time period, the converter valve is prohibited from being unlocked, and the valve tower is allowed to be de-energized and the faulty submodule is repaired manually on the valve tower.

[0067] Preferably, this step may further include: if the communication of the faulty submodule is not restored within the second preset time period, or if the communication is restored but the thyristor is not equipped without successful bypass or capacitor voltage drop, or if the faulty submodule still fails to bypass or capacitor voltage drop after another bypass command is issued, the converter valve is prohibited from unlocking, and the valve tower is de-energized for manual inspection of the faulty submodule.

[0068] After automatic attempts over a first preset time period and manual intervention over a second preset time period, if the problem with the faulty submodule persists, it indicates that the conditions for safely releasing the converter valve's operational restrictions have not been met. This includes the following three scenarios:

[0069] 1. "Communication of the faulty submodule has not been restored within the second preset time period": This means that even after a relatively long second preset time period, the valve control system is still unable to establish communication with the faulty submodule. This implies that the system is completely unable to obtain the status information of the submodule, and naturally cannot confirm whether it has been safely bypassed. In this situation, the risk is too high, and unlocking must be prohibited for manual inspection.

[0070] 2. "Communication restored, but without successful bypass or capacitor voltage drop, no bent thyristor was provided":

[0071] This situation can be divided into two parts: communication is restored, and the system can "communicate" with the submodule; however, bypassing fails: no main bypass switch closed signal is received, or it is received but the capacitor voltage does not drop, indicating that the bypass operation is ineffective. Furthermore, there is no backup plan, meaning the submodule is not equipped with a bent thyristor. This means that after the main bypass fails, there is no second method for remote activation of the bypass. At this point, because the main bypass has failed and there is no backup bypass mechanism for remote activation, it is impossible to ensure that the faulty module is safely isolated. Therefore, unlocking must be disabled, and manual maintenance must be performed.

[0072] 3. "The faulty submodule still failed to bypass successfully or the capacitor voltage still did not drop after the bypass command was issued again": This means that the submodule's communication was restored, but the first attempt at main bypass failed (or the voltage did not drop). At this point, the system detected that the submodule was equipped with a bent thyristor, so it issued a bypass command again (attempting to activate the bent thyristor). However, even after this attempt using the bent thyristor, the faulty submodule still failed to bypass successfully, or its capacitor voltage still did not drop. This indicates that neither the main bypass mechanism nor the backup bent thyristor bypass mechanism successfully isolated the faulty module. All remote attempts failed, the problem is serious, and unlocking must be disabled for a thorough manual tower inspection.

[0073] When any of the above three situations occur, the converter valve should be prevented from unlocking first. Since the faulty module has failed to be isolated or its status is unclear, in order to prevent the fault from escalating or affecting the safe and stable operation of the entire converter valve system, the converter valve must be prevented from entering normal operation. Then, wait for the valve tower to be de-energized. This is to ensure personnel safety. Then, manually go up the valve tower to inspect the faulty submodule. Because at this point, the problem has exceeded the scope of remote control and automatic / semi-automatic recovery, professional technicians need to enter the valve tower to perform physical inspection, diagnosis, repair, or replacement of the specific faulty submodule.

[0074] The above method will be further explained below through another embodiment, such as... Figure 4 The diagram shown is a flowchart illustrating a method for handling a black module failure during the startup of a converter valve, according to another embodiment of this application. The method includes the following steps:

[0075] Step S401: During the start-up process of the converter valve, the system detects that a submodule has failed, i.e., a black module failure.

[0076] Step S402: The valve control or central control board sends a bypass command to the submodule that has experienced a black module failure.

[0077] Step S403: Determine the shortest time (Δt) S Whether internal communication has been restored, here Δt SIf communication is restored within a certain period of time after a black module failure is detected, proceed to step S404; otherwise, proceed to step S406.

[0078] Step S404: Determine whether the bypass switch closed signal of the faulty submodule has been received. If received, proceed to step S405; otherwise, proceed to step S406.

[0079] Step S405: Automatically reset the black module identifier, automatically set the valve group ready signal, allow the converter valve to unlock, and the converter valve can be unlocked and operated.

[0080] Step S406: Determine the time duration (Δt) L Whether internal communication has been restored, here Δt L This also occurred some time after the black module fault was detected, but Δt L The value of Δt S If communication is restored, proceed to step S407; otherwise, proceed to step S412.

[0081] Step S407: Determine whether a bypass switch closing signal from the faulty submodule has been received and whether the capacitor voltage of the faulty submodule has dropped. If yes, proceed to step S411; otherwise, proceed to step S408.

[0082] Step S408: Determine whether the faulty submodule is equipped with a switching thyristor. If yes, proceed to step S409; otherwise, proceed to step S412.

[0083] Step S409: Send a bypass command to the faulty submodule again.

[0084] Step S410: Determine whether a bypass switch closing signal from the faulty submodule has been received and whether the capacitor voltage of the faulty submodule has dropped. If yes, proceed to step S411; otherwise, proceed to step S412.

[0085] Step S411: Manually remotely reset the black module indicator under energization; set the valve group ready signal; allow the converter valve to unlock, and the converter valve can be unlocked and operated.

[0086] Step S412: Disable the converter valve unlocking, de-energize the converter valve for maintenance, and manually enter the valve hall to handle the fault submodule.

[0087] As can be seen from the above, the method for handling black module failures during converter valve startup proposed in this invention helps improve the safety and convenience of handling "black module" problems and saves maintenance time. By improving maintenance efficiency, the power outage time of the converter valve is reduced, thereby increasing the utilization rate of new energy sources and the energy availability rate of the converter station.

[0088] Preferably, the step S101 above, which sends a bypass instruction to the corresponding faulty submodule, may further include: determining whether there are multiple submodules corresponding to the black module fault; if so, sending the first bypass instruction to the corresponding submodule according to the set priority.

[0089] During the start-up process of the converter valve, the valve control system can monitor the communication status of all sub-modules in real time. If multiple sub-modules are detected to have a black module failure at the same time, further priority judgment can be made on these sub-modules. That is, by counting the number of sub-modules that have a black module failure, it can be determined whether there are multiple sub-modules that need to be dealt with at the same time.

[0090] In this embodiment, the priority setting can be determined based on the submodule's topological position in the converter valve, the submodule's impact on system operation, historical operating data, or fault frequency. For example, submodules closer to the DC or AC side can be bypassed first, critical submodules can be bypassed first, and submodules with high fault frequency can be bypassed first.

[0091] According to the set priority order, the valve control system sequentially issues the first bypass command to the submodules experiencing black module failures, ensuring that critical submodules are addressed first. This avoids issuing bypass commands to multiple submodules simultaneously, which could lead to excessive resource consumption or communication conflicts in the valve control system. By prioritizing and issuing bypass commands in stages, system resources can be rationally allocated when multiple submodules experience black module failures simultaneously, ensuring that critical submodules are addressed first, thus improving the efficiency and reliability of fault handling. This also avoids system operational risks caused by simultaneous bypass failures of multiple submodules, further enhancing the safety and stability of the converter valve startup process.

[0092] Preferably, before step S101 above, the method of this embodiment further includes: before the converter valve is started, pre-detecting the communication links of all sub-modules; if an abnormality is found in the communication link, bypassing operation or replacing the sub-module is performed in advance.

[0093] In this embodiment, before the converter valve starts, the valve control system performs a comprehensive check on the communication links of all submodules to ensure normal communication between the submodules and the valve control system. The checks may include the integrity of the communication links, the stability of the communication signals, and the communication delay between the submodules and the valve control system. This pre-checking can detect potential communication anomalies in advance, preventing black module failures due to communication interruptions during converter valve startup. This improves the reliability of the converter valve startup process and reduces the risk of potential failures during startup.

[0094] If an anomaly is detected in the communication link, a bypass operation or replacement of the submodule can be performed in advance. For submodules with detected communication link anomalies, the valve control system can directly issue a bypass command before the converter valve starts, switching the submodule to bypass mode. By bypassing in advance, black module failures caused by communication anomalies during startup can be avoided, ensuring smooth startup of the converter valve. If a serious anomaly is detected in the communication link of a submodule (such as hardware failure or complete communication link interruption), the submodule can be replaced before startup. Replacing the submodule can completely resolve the communication anomaly problem and avoid system operation risks caused by submodule failures.

[0095] Preferably, after the converter valve is allowed to unlock and enter normal operation, the method of this embodiment further includes: for submodules that have experienced black module failures, increasing the monitoring frequency and data sampling rate of the corresponding operating parameters, while reducing the corresponding alarm threshold.

[0096] Submodules that have experienced black module failures may have potential hidden dangers, such as unstable communication links, degraded hardware performance, or other abnormal situations. For these types of submodules, increasing the monitoring frequency and data sampling rate can capture changes in the submodule's operating status more promptly, making it easier to discover potential problems.

[0097] Specifically, in this embodiment, the valve control system can mark submodules that have experienced black module failures as key monitoring targets. Then, the monitoring frequency and data sampling rate of their critical operating parameters (such as capacitor voltage, bypass switch status, and communication link status) are increased to ensure real-time monitoring of the operating status of these submodules. Simultaneously, the alarm threshold can be lowered to trigger alarms in the early stages of problems, facilitating rapid intervention by maintenance personnel. For example, the alarm threshold for communication interruption time can be lowered from t... d shortened to t d' (t) d <t d' The alarm threshold for capacitor voltage fluctuation range is reduced from ΔU to ΔU' (ΔU' < ΔU). Based on the reduced alarm threshold, the valve control system monitors the operating status of the submodule in real time and quickly triggers an alarm when an anomaly occurs.

[0098] Preferred, such as Figure 5 As shown, the method described in this embodiment may further include the following steps:

[0099] Step S501: Use the high-speed data buffer to record the operating data of each submodule within a preset time period before the black module fault detection, including the submodule output voltage, the current flowing through the submodule, and the internal temperature of the submodule.

[0100] During the start-up process of the converter valve, the valve control system can record the operating data of each submodule in real time through a high-speed data buffer. The submodule output voltage reflects the charging state and operational stability of the submodule capacitor, the current flowing through the submodule is used to determine the load condition and current fluctuation characteristics of the submodule, and the internal temperature of the submodule is used to monitor the heat dissipation performance and changes in the operating environment.

[0101] The data recording time period is a preset time period before the black module fault detection (e.g., T). pre (Seconds) to ensure the capture of critical operational information prior to a failure. The high-speed data cache needs sufficient storage capacity and fast read / write capabilities to ensure real-time recording of operational data from all submodules. The data recording time period can be set according to actual operational needs, covering the critical time period before a failure while avoiding excessively long periods that could lead to data redundancy.

[0102] Step S502: When a black module failure is detected in a submodule, the cached data of the corresponding submodule within a preset time period before the failure occurs is extracted.

[0103] When the valve control system detects a black module failure in a submodule (i.e., communication interruption time exceeds a set threshold), it immediately retrieves the submodule's operating data for the preset time period prior to the failure from the high-speed data buffer. The retrieved data includes key parameters such as the submodule's output voltage, current flowing through the submodule, and internal temperature. The retrieved data is precisely aligned with the time of the failure, ensuring the timeliness and accuracy of the data.

[0104] Step S503: Calculate the voltage change rate, current change rate, and heating rate of the corresponding sub-module using the cached data to provide a basis for subsequent maintenance.

[0105] The extracted cached data is used to calculate the rate of change of key operating parameters of the submodule, including:

[0106] Voltage change rate: By analyzing the trend of the output voltage change of the submodule, it can be determined whether there is any abnormality in the charging process of the submodule capacitor (such as too fast or too slow).

[0107] Current change rate: By analyzing the trend of current change flowing through the sub-module, it can be determined whether there are abnormal fluctuations in the load of the sub-module (such as overcurrent or current interruption).

[0108] Heating rate: By analyzing the temperature change trend inside the submodule, we can determine whether the heat dissipation performance of the submodule is normal (such as overheating or poor heat dissipation).

[0109] The calculation results provide an important basis for subsequent maintenance, helping maintenance personnel to quickly locate the cause of the fault and develop targeted maintenance plans.

[0110] like Figure 6 The diagram shown is a structural schematic of a device for handling a black module failure during the startup of a converter valve, according to an embodiment of this application. The device includes: a bypass command issuing unit 610 and a graded handling unit 620, wherein:

[0111] The bypass command issuing unit 610 is used to issue a bypass command to the corresponding faulty submodule when a black module fault is detected during the start-up of the converter valve.

[0112] The graded handling unit 620 is used to take the following graded handling measures for the converter valve based on a preset time process and the status feedback of the fault submodule:

[0113] If the communication of the faulty submodule is restored and successfully bypassed within the first preset time period, the operation restriction of the converter valve will be automatically lifted.

[0114] If the communication of the faulty submodule is not restored within the first preset time period, or the communication is restored but the bypass is not successful, then within the second preset time period, when the faulty submodule meets the preset conditions, the operation restriction of the converter valve is manually lifted. The second preset time period is longer than the first preset time period.

[0115] If the faulty submodule does not meet the preset conditions within the second preset time period, the converter valve is prohibited from unlocking, and the valve tower is shut down for manual inspection of the faulty submodule.

[0116] As an embodiment of the present invention, the step of manually lifting the operation restriction of the converter valve when the faulty submodule meets the preset conditions during the second preset time period includes: when the faulty submodule's communication is restored, it is successfully bypassed, and the capacitor voltage drops during the second preset time period, the operation restriction of the converter valve is manually lifted.

[0117] As an embodiment of the present invention, during the second preset time period, the communication of the faulty submodule is restored. If the bypass is not successful or the capacitor voltage does not drop, and if the faulty submodule is equipped with a bent thyristor, a bypass command is sent to the faulty submodule again. If the faulty submodule successfully bypasses and the capacitor voltage drops after the bypass command is sent again, the operation restriction of the converter valve is manually lifted.

[0118] As an embodiment of the present invention, the step of prohibiting the unlocking of the converter valve and waiting for the valve tower to be de-energized and for manual inspection of the faulty submodule during the second preset time period includes: if the communication of the faulty submodule is not restored during the second preset time period, or if the communication is restored but a bending thyristor is not equipped without successful bypass or capacitor voltage drop, or if the faulty submodule still fails to bypass or capacitor voltage drop after a bypass command is issued again, the converter valve is prohibited from unlocking and the valve tower is de-energized and for manual inspection of the faulty submodule.

[0119] Preferably, the bypass instruction issuing unit 610 is specifically used to: determine whether there are multiple sub-modules corresponding to the black module fault; if so, issue the first bypass instruction to the corresponding sub-modules according to the set priority.

[0120] Preferably, the above-mentioned device further includes: a fault monitoring unit, used to monitor the uplink communication between the submodule and the valve control unit during a preset period of the converter valve start-up charging process; if the communication interruption time exceeds a preset threshold, it is determined that a black module fault has occurred, and the preset period is located at the end of the uncontrolled charging stage.

[0121] Preferably, the above-mentioned device further includes: a pre-detection unit, used to pre-detect the communication links of all sub-modules before the converter valve is started; if an abnormality is found in the communication link, a bypass operation or replacement of the sub-module is performed in advance.

[0122] Preferably, the above-mentioned device further includes: a parameter adjustment unit, used to increase the monitoring frequency and data sampling rate of the corresponding operating parameters for submodules that have experienced black module failures after the converter valve is unlocked and enters normal operation, while reducing the corresponding alarm threshold.

[0123] Preferably, the above-mentioned device further includes:

[0124] The data recording unit is used to record the operating data of each submodule within a preset time period before the black module fault detection using a high-speed data buffer, including the submodule output voltage, the current flowing through the submodule, and the internal temperature of the submodule.

[0125] The data extraction unit is used to extract the cached data of the corresponding submodule within a preset time period before the failure is detected when a black module failure is detected in the submodule.

[0126] The parameter calculation unit is used to calculate the voltage change rate, current change rate, and heating rate of the corresponding sub-module using the cached data, providing a basis for subsequent maintenance.

[0127] For detailed descriptions of the above-mentioned units and modules, please refer to the corresponding descriptions in the foregoing method embodiments, which will not be repeated here.

[0128] As described above, the handling device for black module failure during converter valve startup proposed in this invention improves the fault tolerance capability of black module failure by introducing two bypass commands. Even if the first bypass fails, there is still a chance to restore the normal operation of the submodule through the second bypass, thereby improving the startup success rate of the converter valve. In addition, this application allows the converter valve to unlock and operate normally after receiving bypass feedback, reducing the number and time of power outage maintenance caused by black module failure, shortening the downtime of the converter station, reducing the workload of manual intervention and on-site operation, and lowering operation and maintenance costs.

[0129] Figure 7 This is a schematic diagram of an electronic device provided in an embodiment of the present invention. Figure 7 The illustrated electronic device is a general-purpose data processing apparatus, comprising a general-purpose computer hardware structure, including at least a processor 801 and a memory 802. The processor 801 and memory 802 are connected via a bus 803. The memory 802 is adapted to store one or more instructions or programs executable by the processor 801. These instructions or programs are executed by the processor 801 to implement the steps in the handling method for a black module failure during converter valve startup described above.

[0130] The processor 801 described above can be a standalone microprocessor or a collection of one or more microprocessors. Thus, the processor 801 executes commands stored in the memory 802, thereby performing the method flow of the embodiments of the present invention as described above to process data and control other devices. The bus 803 connects the aforementioned components together, and also connects these components to the display controller 804, the display device, and the input / output (I / O) device 805. The input / output (I / O) device 805 can be a mouse, keyboard, modem, network interface, touch input device, motion-sensing input device, printer, and other devices known in the art. Typically, the input / output (I / O) device 805 is connected to the system via an input / output (I / O) controller 806.

[0131] The memory 802 can store software components, such as an operating system, a communication module, an interaction module, and application programs. Each of the modules and application programs described above corresponds to a set of executable program instructions that perform one or more functions and the methods described in the embodiments of the invention.

[0132] This invention also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps of the above-described method for handling a black module failure during the startup of the converter valve.

[0133] This invention also provides a computer program product, including a computer program / instruction, which, when executed by a processor, implements the steps of the above-mentioned method for handling a black module failure during the startup of the converter valve.

[0134] The method and apparatus for handling black module failures during converter valve startup proposed in this invention improves the fault tolerance capability of black module failures by introducing two bypass commands. Even if the first bypass fails, there is still a chance to restore the normal operation of the submodule through the second bypass, thereby improving the startup success rate of the converter valve. In addition, this application allows the converter valve to unlock and operate normally after receiving bypass feedback, reducing the number and time of power outages for maintenance due to black module failures, shortening the downtime of the converter station, reducing the workload of manual intervention and on-site operation, and lowering operation and maintenance costs.

[0135] Preferred embodiments of the invention have been described above with reference to the accompanying drawings. Many features and advantages of these embodiments are apparent from this detailed description, and therefore the claims are intended to cover all such features and advantages of these embodiments that fall within their true spirit and scope. Furthermore, since many modifications and alterations will readily occur to those skilled in the art, the embodiments of the invention are not intended to be limited to the precise structures and operations illustrated and described, but rather to encompass all suitable modifications and equivalents falling within their scope.

[0136] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0137] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0138] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0139] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0140] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for handling a black module fault during the startup of a converter valve, characterized in that, The method includes: When a black module fault is detected during the start-up of the converter valve, a bypass command is sent to the corresponding faulty submodule. Based on the preset time schedule and the status feedback of the faulty submodule, the following graded handling measures are taken for the converter valve: If the communication of the faulty submodule is restored and successfully bypassed within the first preset time period, the operation restriction of the converter valve will be automatically lifted. If the communication of the faulty submodule is not restored within the first preset time period, or the communication is restored but the bypass is not successful, then within the second preset time period, when the faulty submodule meets the preset conditions, the operation restriction of the converter valve is manually lifted. The second preset time period is longer than the first preset time period. If the faulty submodule does not meet the preset conditions within the second preset time period, the converter valve is prohibited from unlocking, and the valve tower is shut down for manual inspection of the faulty submodule.

2. The method for handling a black module failure during the start-up of the converter valve as described in claim 1, characterized in that, When the faulty submodule meets the preset conditions within the second preset time period, the manual release of the operating restrictions of the converter valve includes: Within the second preset time period, when the communication of the faulty submodule is restored, the bypass is successfully completed, and the capacitor voltage drops, the operation restriction of the converter valve is manually lifted.

3. The method for handling a black module failure during the start-up of the converter valve as described in claim 2, characterized in that, Within the second preset time period, the communication of the faulty submodule is restored. If the bypass is unsuccessful or the capacitor voltage does not drop, and if the faulty submodule is equipped with a bent thyristor, a bypass command is sent to the faulty submodule again. If the faulty submodule successfully bypasses and the capacitor voltage drops after the bypass command is sent again, the operation restriction of the converter valve is manually lifted.

4. The method for handling a black module failure during the start-up of the converter valve as described in claim 3, characterized in that, If the faulty submodule fails to meet the preset conditions within the second preset time period, the converter valve will be prohibited from unlocking, and the valve tower will be de-energized for manual inspection of the faulty submodule. If, within the second preset time period, the communication of the faulty submodule is not restored, or if the communication is restored but a bent thyristor is not provided without successful bypass or capacitor voltage drop, or if the faulty submodule still fails to bypass or capacitor voltage drop after another bypass command is issued, the converter valve is prohibited from unlocking, and the valve tower is de-energized for manual inspection of the faulty submodule.

5. The method for handling a black module failure during the start-up of the converter valve as described in claim 1, characterized in that, The step of issuing bypass instructions to the corresponding faulty submodule includes: determining whether there are multiple faulty submodules corresponding to the black module fault; if so, issuing bypass instructions to the corresponding faulty submodules according to the set priority.

6. The method for handling a black module failure during the start-up of the converter valve as described in claim 1, characterized in that, The method further includes: during a preset period of the converter valve's start-up charging process, monitoring the uplink communication between the submodule and the valve control unit; if the communication interruption time exceeds a preset threshold, determining that a black module fault has occurred; the preset period is located at the end of the uncontrolled charging phase.

7. The method for handling a black module failure during the start-up of the converter valve as described in claim 1, characterized in that, The method further includes: before starting the converter valve, pre-testing the communication links of all sub-modules; if an abnormality is found in the communication link, bypassing operation or replacing the sub-module is performed in advance.

8. The method for handling a black module failure during the start-up of the converter valve as described in claim 1, characterized in that, After the converter valve is unlocked and enters normal operation, the method further includes: for submodules that have experienced black module failures, increasing the monitoring frequency and data sampling rate of the corresponding operating parameters, while lowering the corresponding alarm threshold.

9. The method for handling a black module failure during the start-up of the converter valve as described in claim 1, characterized in that, The method further includes: The high-speed data cache is used to record the operating data of each submodule within a preset time period before the black module fault detection, including the submodule output voltage, the current flowing through the submodule, and the internal temperature of the submodule; When a black module failure is detected in a submodule, the cached data of the corresponding faulty submodule within a preset time period before the failure occurred is extracted. The cached data is used to calculate the voltage change rate, current change rate, and heating rate of the corresponding sub-module, providing a basis for subsequent maintenance.

10. A device for handling a black module fault during the startup of a converter valve, characterized in that, The device includes: The bypass command issuing unit is used to issue a bypass command to the corresponding faulty submodule when a black module fault is detected during the start-up of the converter valve. The graded handling unit is used to take the following graded handling measures for the converter valve based on a preset time process and the status feedback of the faulty submodule: If the communication of the faulty submodule is restored and successfully bypassed within the first preset time period, the operation restriction of the converter valve will be automatically lifted. If the communication of the faulty submodule is not restored within the first preset time period, or the communication is restored but the bypass is not successful, then within the second preset time period, when the faulty submodule meets the preset conditions, the operation restriction of the converter valve is manually lifted. The second preset time period is longer than the first preset time period. If the faulty submodule does not meet the preset conditions within the second preset time period, the converter valve is prohibited from unlocking, and the valve tower is shut down for manual inspection of the faulty submodule.

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