Fault monitoring method and device based on power consumption of secondary board card of flexible direct current converter valve, computer equipment, storage medium and computer program product

Abstract

The invention provides a fault monitoring method and device based on power consumption of a secondary board card of a flexible direct current converter valve, computer equipment, a storage medium and a computer program product. The method comprises the following steps: acquiring input power consumption of an energy-taking power supply secondary board card under a normal working condition, and acquiring real-time input power consumption of the energy-taking power supply secondary board card; according to the real-time input power consumption of the energy-taking power supply secondary board card and the input power consumption of the energy-taking power supply secondary board card under the normal working condition, real-time input power consumption change information of the energy-taking power supply secondary board card is determined; and under the condition that the real-time input power consumption change information of the energy-taking power supply secondary board card represents that the real-time input power consumption of the energy-taking power supply secondary board card is abnormal, determining a fault secondary board card in the energy-taking power supply secondary board card and each signal processing secondary board card based on the real-time input power consumption change information of the energy-taking power supply secondary board card. By adopting the method, accurate fault detection can be performed on the flexible direct-current converter valve in real time.

Description

Technical Field

[0001] This application relates to the field of flexible DC power transmission technology, and in particular to a fault monitoring method, device, computer equipment, storage medium and computer program product based on the power consumption of the secondary board of a flexible DC converter valve. Background Technology

[0002] Flexible DC transmission technology is a new type of DC transmission technology with strong controllability, flexibility and stability. As flexible DC projects are continuously put into use, the voltage level of flexible DC converter valves is getting higher and higher, which poses new challenges to the reliability of flexible DC converter valves.

[0003] Currently, to ensure the reliability of flexible DC converter valves, redundancy and backup are typically implemented during the design phase. However, even with these redundancies and backups, the risk of downtime due to malfunctions still exists during actual operation, which can result in significant losses. Existing technologies rely on self-diagnostic communication between individual boards or the deployment of numerous distributed sensors for fault detection, which suffers from poor real-time performance, posing a serious challenge to the real-time reliability of flexible DC converter valves.

[0004] Therefore, traditional technologies have the problem of being unable to accurately detect faults in flexible DC converter valves in real time. Summary of the Invention

[0005] The purpose of this application is to at least solve one of the above-mentioned technical defects, in particular the technical defect that the prior art cannot accurately detect faults in flexible DC converter valves in real time. This application provides a fault monitoring method, device, computer equipment, computer-readable storage medium and computer program product based on the power consumption of the secondary board of the flexible DC converter valve, which can accurately detect faults in flexible DC converter valves in real time.

[0006] In a first aspect, this application provides a fault monitoring method based on the power consumption of a secondary board in a flexible DC-DC converter valve. The method is applied to a flexible DC-DC converter valve, which includes a power supply secondary board and at least one signal processing secondary board. The power supply secondary board supplies power to each signal processing secondary board. The method includes:

[0007] The input power consumption of the secondary board of the power supply under normal operating conditions is obtained, as well as the real-time input power consumption of the secondary board of the power supply.

[0008] Based on the real-time input power consumption of the secondary power supply board and the input power consumption of the secondary power supply board under normal operating conditions, determine the real-time input power consumption change information of the secondary power supply board.

[0009] When the real-time input power consumption change information of the power supply secondary board indicates that the real-time input power consumption of the power supply secondary board is abnormal, the faulty secondary board is identified among the power supply secondary board and each signal processing secondary board based on the real-time input power consumption change information of the power supply secondary board.

[0010] In one embodiment, based on the real-time input power consumption change information of the power supply secondary board, the faulty secondary board is identified among the power supply secondary board and each signal processing secondary board, including:

[0011] Obtain the mapping relationship between pre-built input power consumption change information and secondary board fault characteristics;

[0012] Based on the mapping relationship, the fault characteristics of the target secondary board that match the real-time input power consumption change information of the power supply secondary board are determined.

[0013] Based on the fault characteristics of the target secondary board, the faulty secondary board is identified among the power supply secondary board and each signal processing secondary board.

[0014] In one embodiment, after determining the faulty secondary board, the method further includes:

[0015] If the faulty secondary board is any signal processing secondary board, obtain the input power consumption of the signal processing secondary board under normal operating conditions and the real-time input power consumption of the signal processing secondary board.

[0016] Based on the input power consumption of the signal processing secondary board under normal operating conditions and the real-time input power consumption of the signal processing secondary board, the real-time input power consumption change information of the signal processing secondary board is determined.

[0017] If the real-time input power consumption of the signal processing secondary board is abnormal, it is confirmed that the signal processing secondary board is a faulty secondary board.

[0018] In one embodiment, after determining the faulty secondary board, the method further includes:

[0019] When the faulty secondary board is a power supply secondary board, obtain the real-time output power consumption of the power supply secondary board.

[0020] If the difference between the real-time output power consumption and the real-time input power consumption of the power supply secondary board deviates from the power consumption difference of the power supply secondary board under normal operating conditions, the power supply secondary board is confirmed to be a faulty secondary board.

[0021] In one embodiment, obtaining the input power consumption of the power supply secondary board under normal operating conditions includes:

[0022] Under standard test conditions, a high-voltage DC power supply is used to apply the rated voltage to the capacitor that supplies power to the secondary circuit board of the power extraction power supply.

[0023] After the voltage of the capacitor stabilizes, the output current of the high-voltage DC power supply is obtained;

[0024] Based on the output current of the high-voltage DC power supply, the input power consumption of the secondary board of the power harvesting power supply under normal operating conditions is determined.

[0025] In one embodiment, obtaining the real-time input power consumption of the power supply secondary board includes:

[0026] Acquire the real-time input current signal and real-time input voltage signal of the power supply secondary board;

[0027] Based on the real-time input current signal and the real-time input voltage signal, the real-time input power consumption of the secondary board of the power supply is determined.

[0028] Secondly, this application provides a fault monitoring device based on the power consumption of a secondary board in a flexible DC converter valve, applied to a flexible DC converter valve. The flexible DC converter valve includes a power supply secondary board and at least one signal processing secondary board. The power supply secondary board is used to supply power to each signal processing secondary board. The device includes:

[0029] The acquisition module is used to acquire the input power consumption of the secondary board of the power supply under normal operating conditions, and to acquire the real-time input power consumption of the secondary board of the power supply.

[0030] The determination module is used to determine the real-time input power consumption change information of the secondary board of the power supply based on the real-time input power consumption and the input power consumption of the secondary board of the power supply under normal operating conditions.

[0031] The identification module is used to identify the faulty secondary board among the power supply secondary board and each signal processing secondary board when the real-time input power consumption change information of the power supply secondary board indicates that the real-time input power consumption of the power supply secondary board is abnormal.

[0032] Thirdly, this application provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps of the above-described method.

[0033] Fourthly, this application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the above-described method.

[0034] Fifthly, this application provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the above-described method.

[0035] As can be seen from the above technical solutions, the embodiments of this application have the following advantages:

[0036] The fault monitoring method, device, computer equipment, storage medium, and computer program product based on the power consumption of a flexible DC converter valve secondary board provided in this application acquire the input power consumption of the power supply secondary board under normal operating conditions, and acquire the real-time input power consumption of the power supply secondary board; determine the real-time input power consumption change information of the power supply secondary board based on the real-time input power consumption and the input power consumption under normal operating conditions; when the real-time input power consumption change information of the power supply secondary board indicates that the real-time input power consumption of the power supply secondary board is abnormal, based on the real-time input power consumption change information of the power supply secondary board, [the system] monitors the power supply secondary board and [other components]. The faulty secondary board is identified in the signal processing secondary board. Thus, by using the total input power consumption of the power supply secondary board as a macroscopic monitoring point for the health status of the flexible DC converter valve secondary system, abnormalities in the power supply and all signal processing secondary boards downstream of the power supply can be sensitively detected. This achieves the beneficial effect of accurate fault detection of the flexible DC converter valve in real time, realizing holistic and non-intrusive online monitoring of the flexible DC converter valve secondary system. It solves the problems of high cost, system complexity, and poor real-time performance caused by traditional methods that rely on self-diagnostic communication of each board or the deployment of a large number of distributed sensors, which makes it impossible to comprehensively and accurately identify early faults. This provides a key basis for preventive maintenance of the system. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of this application 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 this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a flowchart illustrating a fault monitoring method based on the power consumption of a flexible DC converter valve secondary board in one embodiment.

[0039] Figure 2 This is a block diagram of the power supply output of the flexible DC converter valve submodule in one embodiment;

[0040] Figure 3 This is a schematic diagram of an experimental measurement method for the power consumption of a secondary board in one embodiment;

[0041] Figure 4 This is a schematic diagram of adding a current sensor and voltage sampling circuit between the module capacitor and the power source in one embodiment;

[0042] Figure 5 This is a flowchart illustrating a fault monitoring method based on the power consumption of a flexible DC converter valve secondary board in another embodiment.

[0043] Figure 6 This is a structural block diagram of a fault monitoring device based on the power consumption of a flexible DC converter valve secondary board in one embodiment.

[0044] Figure 7 This is an internal structural diagram of a computer device in one embodiment. Detailed Implementation

[0045] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0046] In one exemplary embodiment, such as Figure 1 As shown, a fault monitoring method based on the power consumption of a secondary board in a flexible DC-DC converter valve is provided. This method is applied to a flexible DC-DC converter valve, which includes a power supply secondary board and at least one signal processing secondary board. The power supply secondary board supplies power to each signal processing secondary board. Taking the application of this method to a controller as an example, the method includes the following steps S102 to S106. Wherein:

[0047] Step S102: Obtain the input power consumption of the secondary power supply board under normal operating conditions, and obtain the real-time input power consumption of the secondary power supply board.

[0048] Among them, the flexible DC converter valve is the core power conversion unit in the voltage source converter, used to achieve efficient conversion between DC and AC power.

[0049] Among them, the power supply secondary board is a functional module that obtains electrical energy from the high-voltage main circuit inside the converter valve and converts it into a stable low-voltage DC power supply to power other control boards.

[0050] Among them, the signal processing secondary board is a dedicated circuit board that relies on the power supply secondary board for power and is responsible for performing signal acquisition, logic operation, drive protection or communication tasks.

[0051] For example, a signal processing secondary board can be a bypass driver board for a power module, an IGBT driver board, or a module control board.

[0052] Among them, the real-time input power consumption of the power supply secondary board refers to the total electrical power consumed in real time from its high-voltage input terminal (usually from the sub-module capacitor) in order to power itself and all downstream signal processing secondary boards during the actual operation of the flexible DC converter valve.

[0053] Normal operating conditions refer to the state in which the flexible DC converter valve is healthy, undamaged, and operates under rated conditions with stable parameters.

[0054] The input power consumption of the secondary power supply board under normal operating conditions refers to the standard electrical power consumed by the secondary power supply board from its input terminal (usually the submodule capacitor) when the flexible DC converter valve is completely healthy, fault-free, and operating under rated conditions.

[0055] Optionally, during the system debugging or fault-free confirmation phase, the controller first measures and stores the reference input power consumption of the secondary power supply board under normal operating conditions. During the operation monitoring phase, the controller continuously acquires the real-time input power consumption of the secondary power supply board through a high-precision sampling circuit.

[0056] Step S104: Determine the real-time input power consumption change information of the power supply secondary board based on the real-time input power consumption of the power supply secondary board and the input power consumption of the power supply secondary board under normal operating conditions.

[0057] Among them, the real-time input power consumption change information of the power supply secondary board is a quantitative description of the difference obtained by comparing the real-time power consumption of the power supply secondary board with the reference power consumption of the power supply secondary board. It can be the power consumption change magnitude, power consumption change rate or power consumption change trend.

[0058] Optionally, the controller analyzes and calculates (e.g., calculates the difference, ratio, or more complex statistical analysis) the real-time input power consumption of the secondary power supply board based on the real-time input power consumption and the input power consumption of the secondary power supply board under normal operating conditions to obtain the real-time input power consumption change information of the secondary power supply board.

[0059] Step S106: When the real-time input power consumption change information of the power supply secondary board indicates that the real-time input power consumption of the power supply secondary board is abnormal, the faulty secondary board is identified among the power supply secondary board and each signal processing secondary board based on the real-time input power consumption change information of the power supply secondary board.

[0060] Among them, a faulty secondary board refers to a secondary board that is abnormal or lost due to component failure, performance degradation or external damage. The faulty secondary board can be a power supply secondary board or a signal processing secondary board, that is, a power supply, a bypass driver board, an IGBT driver board or a module control board.

[0061] Optionally, when the controller determines that the real-time input power consumption change information of the power supply secondary board exceeds the preset safety threshold, the controller determines that an abnormality has occurred, and analyzes the fault characteristics implied by the abnormal power consumption change according to the preset fault diagnosis logic, and then initially locates the fault source as either the power supply secondary board itself or a downstream signal processing secondary board.

[0062] In this embodiment, only the current / voltage at the power supply input terminal needs to be monitored (single-point sampling), eliminating the need to modify the secondary board or add complex sensors, significantly reducing hardware costs. Furthermore, it directly reflects faults based on changes in input power consumption, resulting in a faster response time.

[0063] The aforementioned fault monitoring method based on the power consumption of the secondary board of the flexible DC converter valve acquires the input power consumption of the secondary board under normal operating conditions, as well as its real-time input power consumption. Based on the real-time and normal operating power consumption of the secondary board, it determines the real-time input power consumption change information. When the real-time input power consumption change information indicates an abnormality in the real-time input power consumption of the secondary board, it identifies the fault in the secondary board and each signal processing secondary board based on this information. Secondary circuit boards; thus, by using the total input power consumption of the secondary circuit boards of the power supply as a macroscopic monitoring point for the health status of the secondary system of the flexible DC converter valve, abnormalities in the power supply and all signal processing secondary circuit boards downstream of the power supply can be sensitively detected. This achieves the beneficial effect of accurate fault detection of the flexible DC converter valve in real time, realizing holistic and non-intrusive online monitoring of the secondary system of the flexible DC converter valve. It solves the problems of high cost, system complexity, and poor real-time performance caused by the traditional method of relying on the self-diagnosis communication of each circuit board or deploying a large number of distributed sensors, which makes it impossible to comprehensively and accurately identify early faults. This provides a key basis for preventive maintenance of the system.

[0064] In one exemplary embodiment, based on the real-time input power consumption change information of the power supply secondary board, the faulty secondary board is identified among the power supply secondary board and each signal processing secondary board, including: obtaining a pre-constructed mapping relationship between input power consumption change information and secondary board fault characteristics; based on the mapping relationship, determining the target secondary board fault characteristics that match the real-time input power consumption change information of the power supply secondary board; and identifying the faulty secondary board among the power supply secondary board and each signal processing secondary board according to the target secondary board fault characteristics.

[0065] The mapping relationship refers to the correspondence between different types of power consumption changes (such as sudden power increase, gradual decrease, and periodic fluctuation) and specific secondary board fault characteristics, which are established in advance through experiments, simulations, or historical fault data accumulation.

[0066] Among them, the secondary board fault characteristics refer to the abstract description of various secondary board fault types in the mapping relationship. For example, "small linear increase in power consumption" may correspond to "aging of the linear regulator on the signal processing board", and "large step increase in power consumption" may correspond to "breakdown of the switching transistor on the power supply board itself".

[0067] Among them, the target secondary board fault characteristics refer to the most suitable secondary board fault type description after matching the real-time monitored power consumption change information with the mapping relationship library.

[0068] Optionally, the controller stores or can access a fault feature database. When abnormal real-time input power consumption changes are detected, the controller matches this information (which may be the amount of change, the rate of change, or waveform characteristics, etc.) with the secondary board fault features in the secondary board fault feature database. If the match is successful, one or more possible target secondary board fault features can be obtained. Each target secondary board fault feature is associated with one or more secondary boards that are most likely to fail. Based on this, the controller can determine the secondary board that is most likely to fail.

[0069] In this embodiment, a pre-constructed mapping relationship between input power consumption change information and secondary board fault characteristics is obtained. Based on the mapping relationship, a target secondary board fault characteristic matching the real-time input power consumption change information of the power supply secondary board is determined. According to the target secondary board fault characteristic, the faulty secondary board is identified among the power supply secondary board and each signal processing secondary board. In this way, a pre-constructed mapping relationship can be introduced to achieve secondary board fault characteristic matching, transforming the vague "power consumption anomaly" into a specific "faulty secondary board", realizing the initial fault location, and improving the level of fault diagnosis and the accuracy of fault location.

[0070] In an exemplary embodiment, after determining the faulty secondary board, the method further includes: if the faulty secondary board is any signal processing secondary board, acquiring the input power consumption of the signal processing secondary board under normal operating conditions and the real-time input power consumption of the signal processing secondary board; determining the real-time input power consumption change information of the signal processing secondary board based on the input power consumption of the signal processing secondary board under normal operating conditions and the real-time input power consumption of the signal processing secondary board; and confirming that the signal processing secondary board is a faulty secondary board if the real-time input power consumption change information of the signal processing secondary board indicates that the real-time input power consumption of the signal processing secondary board is abnormal.

[0071] Among them, the input power consumption of the signal processing secondary board under normal operating conditions refers to the power consumption reference value obtained independently by the signal processing secondary board in a healthy state.

[0072] The real-time input power consumption of the signal processing secondary board refers to the power consumption value measured in real time by a dedicated monitoring circuit for the signal processing secondary board.

[0073] Optionally, when an anomaly is detected in the real-time input power consumption change information of the power supply secondary board, and a fault is initially suspected in one or more signal processing secondary boards, the controller initiates a targeted precise location process. This can be achieved by reading the real-time input power consumption of any signal processing secondary board and comparing it with its baseline input power consumption under normal operating conditions. If the real-time input power consumption change information of the signal processing secondary board indicates that the board is indeed abnormal, the controller can confirm that the board is the faulty secondary board. Conversely, if the real-time input power consumption change information of the signal processing secondary board indicates that it is normal, the possibility of the board being faulty can be ruled out.

[0074] In this application, there are various types of module control board failures, including control communication failures, inability to send module parameter configurations, power module capacitor voltage issues, and inability to transmit fault status information. The main type of IGBT driver board failure is the inability to send drive signals to the IGBTs normally. Bypass driver board failures include bypass failure to operate and bypass malfunctions.

[0075] In practical applications, the specific fault type of a secondary board can be determined by analyzing the failure functions of different secondary boards. A simplified assessment of the secondary board's status can be made based on its power consumption. If problems are found, preventative measures can be taken, such as derating or module bypassing.

[0076] In this embodiment, after determining the faulty secondary board, if the faulty secondary board is any signal processing secondary board, the input power consumption under normal operating conditions and the real-time input power consumption of the signal processing secondary board are acquired. Based on the input power consumption under normal operating conditions and the real-time input power consumption of the signal processing secondary board, the real-time input power consumption change information of the signal processing secondary board is determined. If the real-time input power consumption change information of the signal processing secondary board indicates an abnormality in the real-time input power consumption, the signal processing secondary board is confirmed to be a faulty secondary board. In this way, when the faulty secondary board is identified as a signal processing secondary board, further fault verification can be performed using the independent real-time input power consumption of the signal processing secondary board, thereby ensuring the accuracy of fault location.

[0077] In an exemplary embodiment, after determining the faulty secondary board, the method further includes: if the faulty secondary board is a power supply secondary board, obtaining the real-time output power consumption of the power supply secondary board; if the power consumption difference between the real-time output power consumption and the real-time input power consumption of the power supply secondary board deviates from the power consumption difference of the power supply secondary board under normal operating conditions, confirming that the power supply secondary board is a faulty secondary board.

[0078] Among them, the real-time output power consumption of the power supply secondary board refers to the total power output by the power supply secondary board to all signal processing secondary boards.

[0079] Among them, the power consumption difference refers to the difference between the real-time input power consumption and the real-time output power consumption of the power supply secondary board. This difference mainly reflects the power conversion loss of the power supply secondary board itself.

[0080] Optionally, when the initial diagnosis points to the secondary circuit board of the power supply as a possible fault, the controller initiates a special check on the health status of the secondary circuit board itself. By synchronously collecting the real-time input power consumption and real-time output power consumption of the secondary circuit board, the controller calculates the real-time power consumption difference of the current secondary circuit board and compares this real-time power consumption difference with the standard loss range recorded under normal operating conditions. If the real-time power consumption increases abnormally (indicating reduced conversion efficiency, possibly due to internal short circuit or device overheating) or decreases abnormally (possibly accompanied by output abnormalities), it can be confirmed that the secondary circuit board itself has failed.

[0081] In this application, the specific fault types for power supply failure include no output / abnormal output of 15V1 / 15V2 / 400V.

[0082] In this embodiment, after determining the faulty secondary board, if the faulty secondary board is a power supply secondary board, the real-time output power consumption of the power supply secondary board is acquired. If the power consumption difference between the real-time output power consumption and the real-time input power consumption of the power supply secondary board deviates from the power consumption difference under normal operating conditions, the power supply secondary board is confirmed to be a faulty secondary board. Thus, by monitoring the self-loss of the power supply secondary board, a direct and reliable criterion is provided for determining whether it is faulty. When the faulty secondary board is identified as a power supply secondary board, the input-output power consumption difference of the power supply secondary board can be used for further fault verification, thereby ensuring the accuracy of fault location.

[0083] In one exemplary embodiment, obtaining the input power consumption of the power supply secondary board under normal operating conditions includes: applying a rated voltage to the capacitor supplying power to the power supply secondary board using a high-voltage DC power supply under a standard test environment; obtaining the output current of the high-voltage DC power supply after the voltage of the capacitor stabilizes; and determining the input power consumption of the power supply secondary board under normal operating conditions based on the output current of the high-voltage DC power supply.

[0084] The standard testing environment refers to a laboratory or debugging environment that eliminates adverse factors such as on-site electromagnetic interference and drastic temperature fluctuations.

[0085] Among them, high-voltage DC power supply refers to an external power supply device that is used to simulate the capacitor voltage in actual operation, with adjustable output and high stability.

[0086] Rated voltage refers to the normal operating input voltage value specified in the design of the secondary circuit board of the power supply.

[0087] Optionally, before system commissioning or during maintenance and calibration, the controller controls the switching device to switch the input power supply of the secondary circuit board from the actual submodule capacitor to a high-voltage DC power supply. The output voltage of this power supply is precisely set to the rated voltage of the capacitor. After the system stabilizes, the output current of the high-voltage DC power supply is measured. Combined with the known set voltage value, the precise input power consumption of the secondary circuit board under standard and clean power supply conditions can be calculated. This input power consumption value will be used as the benchmark for subsequent fault diagnosis.

[0088] In this embodiment, under a standard test environment, a high-voltage DC power supply is used to apply the rated voltage to the capacitor that supplies power to the secondary circuit board of the power extraction power supply. After the voltage of the capacitor stabilizes, the output current of the high-voltage DC power supply is obtained. Based on the output current of the high-voltage DC power supply, the input power consumption of the secondary circuit board of the power extraction power supply under normal operating conditions is determined. In this way, a power consumption benchmark can be established under a high-precision standard source, minimizing the impact of voltage fluctuations, ripple noise and other factors on the benchmark power consumption measurement in actual power grid operation. This yields true and reliable benchmark data, which can solve the problem of false alarms and missed alarms in the monitoring system caused by inaccurate benchmark data.

[0089] In one exemplary embodiment, obtaining the real-time input power consumption of the power supply secondary board includes: obtaining the real-time input current signal and the real-time input voltage signal of the power supply secondary board; and determining the real-time input power consumption of the power supply secondary board based on the real-time input current signal and the real-time input voltage signal.

[0090] The real-time input current signal of the power supply secondary board refers to the instantaneous value of the current flowing through the input circuit of the power supply secondary board, which is usually obtained by a series sampling resistor or current sensor (such as a Hall sensor).

[0091] The real-time input voltage signal of the power supply secondary board refers to the instantaneous value of the voltage between the input terminals of the power supply secondary board.

[0092] Optionally, the controller synchronously acquires instantaneous analog signals of current and voltage through a high-bandwidth current sensor and a high-voltage isolation voltage sensor connected to the input path of the power supply secondary board. These signals are then subjected to high-speed analog-to-digital conversion after passing through signal conditioning circuits (such as filtering and amplification), and then digital multiplication is performed by the controller's processing unit (such as DSP or FPGA) to calculate the instantaneous input power value. This instantaneous power value can be further processed by a digital averaging algorithm to obtain a stable average power value, which is used as the real-time input power consumption for subsequent comparison.

[0093] In this embodiment, the real-time input current signal and real-time input voltage signal of the power supply secondary board are acquired; based on the real-time input current signal and real-time input voltage signal, the real-time input power consumption of the power supply secondary board is determined; thus, accurate real-time input power consumption can be obtained, providing a high-fidelity data foundation for real-time and accurate identification of faults in the flexible DC converter valve secondary board.

[0094] In one exemplary embodiment, a fault monitoring device based on the power consumption of a flexible DC converter valve secondary board is provided. This device identifies abnormal states of secondary boards (including module control boards, IGBT driver boards, bypass driver boards, etc.) by monitoring changes in the input power of the power source, thereby enabling rapid fault location.

[0095] Because the power consumption of the secondary circuit board of the flexible DC converter valve submodule is constant under normal operating conditions, its power consumption will significantly deviate from the normal value when the secondary circuit board fails. Utilizing this characteristic, this application calculates the real-time total input power by real-time acquisition of the input current and input voltage of the power source, and compares it with a preset normal power consumption benchmark value to determine the fault type. To achieve the above function, a current sampling circuit needs to be added to sample the input voltage of the power source. The following section, in conjunction with the appendix... Figure 2-4 This embodiment will be described in further detail.

[0096] Reference Figure 2 The diagram shows the power supply output block diagram for the flexible DC converter valve submodule. The maximum input voltage of the power supply is typically 4500V / 6500V, and the output is divided into three paths: a 15V path powers the module control board, with a maximum power of typically 15W; a 15V path is divided into four outputs to power four / two IGBT driver boards, with a maximum power of typically 20W per path; and a 400V path charges the capacitors of the bypass driver board, with a maximum output power of typically 20W.

[0097] Figure 2 The redundant power supply shown serves as a hot standby power source. In the event of a power supply failure, it outputs 12V to provide backup power to the low-voltage circuit of the bypass switch driver board of the power module. Bypass power supply 2 supplies power to the backup energy storage capacitor, providing a backup discharge channel. Under normal power supply conditions, the redundant power supply operates at low power consumption with no output.

[0098] Figure 2 The power source shown supplies power to the module control board, IGBT driver board, and bypass switch driver board of the power module. The output power is designed with a margin based on the actual load power of the board, and the rated power is more than twice the power consumed by its load board.

[0099] Figure 2 Under normal conditions, the power of the secondary circuit board in the flexible DC converter valve shown is relatively constant, meaning the output power of the power supply is constant under different operating conditions. Conversely, when the secondary circuit board malfunctions, the output power consumption of the power supply differs from that under normal conditions. Since the power supply itself is also a secondary circuit board, its power consumption will also differ from that under normal operating conditions when it experiences some faults.

[0100] Based on this, this application identifies and monitors faults in the secondary board of the flexible DC converter valve submodule by using the different outputs of the power supply under different fault conditions.

[0101] Reference Figure 3The experimental measurement method for the power consumption of the secondary circuit boards is shown below. By replacing the capacitor-powered power supply in the flexible DC converter valve submodule with a high-voltage DC power supply, and applying the rated voltage to the capacitor of the power module, the output current of the high-voltage DC power supply can be obtained after the capacitor voltage stabilizes. The total loss of all secondary circuit boards can then be calculated. Similarly, by applying the rated voltage to each secondary circuit board of the power module with the DC power supply and observing the output current of the applied secondary circuit board, the constant power consumption value of each secondary circuit board can be calculated. The secondary circuit board losses are shown in Table 1 below. The value 17.13 corresponds to the total loss of the half-bridge module (corresponding to the two IGBT driver boards of the half-bridge module), and 21.19 corresponds to the total loss of the full-bridge module (corresponding to the four IGBT driver boards of the full-bridge module).

[0102] Table 1

[0103]

[0104] This application can add a current sampling circuit between the module capacitor and the power source. Since the current sampling circuit has electromagnetic / resistive isolation, it can be adapted to high voltage environments.

[0105] Reference Figure 4 This application can also add a current sensor and voltage sampling circuit between the module capacitor and the power supply. By collecting the different voltage values ​​fed back after the current sensor measures the current, the input current value of the power supply can be obtained and finally uploaded to the unit control board. The input power is detected by detecting the input current and voltage of the power supply, and the status of the secondary board can be evaluated based on the power change. For example, when the power supply board fails, its collected power becomes 0W; while when one of the driver boards fails, the collected power will decrease by about 2W. Through this comparison, in conjunction with the program, the fault type of the flexible DC converter valve secondary board can be monitored in real time. Its advantages are that fewer signals are collected, fewer chip signal processing ports are used, and there is no need to measure the output condition, only the input condition needs to be measured, and the input current and voltage signals can be sent to the aggregation board through the sampling board.

[0106] When adding a sampling circuit between the building module and the power supply, this application can use a Hall sensor with electromagnetic isolation or a resistor divider current sampling circuit with resistor isolation. After the current signal is sent to the sampling board and after valve control, it can be multiplied by the sub-module capacitor voltage collected by the control board to obtain the real-time power consumption of the secondary board.

[0107] This application's method for measuring the power consumption of secondary boards involves monitoring the voltage / current output from the power supply to secondary boards such as the module bypass driver board, IGBT driver board, and module control board. (The current sampling circuit can be added to the secondary board to measure the input current, or to the power supply output terminal to measure the output current of each port) to obtain the power of each board. By summarizing the input and output power test data collected in real time from multiple sets of power supplies, the power consumption of the power supply board can be obtained. Its advantage lies in the ability to detect a large number of points, acquire and detect the power consumption of each secondary board, and more accurately estimate the health status of each board. The multi-level diagnostic strategy in this application, based on total power consumption warning and precise board-level location, can adapt to different reliability requirements.

[0108] In another embodiment, such as Figure 5 As shown, a fault monitoring method based on the power consumption of the secondary board of a flexible DC converter valve is provided. Taking the application of this method to a controller as an example, the method includes the following steps:

[0109] Step S502: Obtain the input power consumption of the secondary power supply board under normal operating conditions, and obtain the real-time input power consumption of the secondary power supply board.

[0110] Step S504: Determine the real-time input power consumption change information of the secondary power supply board based on the real-time input power consumption of the secondary power supply board and the input power consumption of the secondary power supply board under normal operating conditions.

[0111] Step S506: When the real-time input power consumption change information of the power supply secondary board indicates that the real-time input power consumption of the power supply secondary board is abnormal, obtain the pre-constructed mapping relationship between the input power consumption change information and the fault characteristics of the secondary board.

[0112] Step S508: Based on the mapping relationship, determine the target secondary board fault characteristics that match the real-time input power consumption change information of the power supply secondary board.

[0113] Step S510: Based on the fault characteristics of the target secondary board, identify the faulty secondary board among the power supply secondary board and each signal processing secondary board.

[0114] It should be noted that the specific limitations of the above steps can be found in the above description of the specific limitations of a fault monitoring method based on the power consumption of a flexible DC converter valve secondary board.

[0115] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0116] The following describes the fault monitoring device based on the power consumption of the secondary board of the flexible DC converter valve provided in the embodiments of this application. The fault monitoring device based on the power consumption of the secondary board of the flexible DC converter valve has the same inventive concept as the above-described fault monitoring method based on the power consumption of the secondary board of the flexible DC converter valve. The solution provided by this device is similar to the solution described in the above-described method. Therefore, the specific limitations of one or more embodiments of the fault monitoring device based on the power consumption of the secondary board of the flexible DC converter valve provided below can be found in the limitations of the fault monitoring method based on the power consumption of the secondary board of the flexible DC converter valve described above. The fault monitoring device based on the power consumption of the secondary board of the flexible DC converter valve described below can be referred to in correspondence with the fault monitoring method based on the power consumption of the secondary board of the flexible DC converter valve described above, and will not be repeated here.

[0117] In one exemplary embodiment, such as Figure 6 As shown, a fault monitoring device based on the power consumption of a flexible DC converter valve secondary board is provided, comprising: an acquisition module 602, a determination module 604, and an identification module 606, wherein:

[0118] The acquisition module 602 is used to acquire the input power consumption of the secondary board of the power supply under normal operating conditions, and to acquire the real-time input power consumption of the secondary board of the power supply.

[0119] The determination module 604 is used to determine the real-time input power consumption change information of the secondary board of the power supply based on the real-time input power consumption of the secondary board of the power supply and the input power consumption of the secondary board of the power supply under normal operating conditions.

[0120] The identification module 606 is used to identify the faulty secondary board among the power supply secondary board and each signal processing secondary board when the real-time input power consumption change information of the power supply secondary board indicates that the real-time input power consumption of the power supply secondary board is abnormal.

[0121] In one embodiment, the identification module 606 is specifically used to acquire a pre-built mapping relationship between input power consumption change information and secondary board fault characteristics; based on the mapping relationship, determine the target secondary board fault characteristics that match the real-time input power consumption change information of the power supply secondary board; and based on the target secondary board fault characteristics, identify the faulty secondary board among the power supply secondary board and each signal processing secondary board.

[0122] In one embodiment, the apparatus further includes: a verification module, configured to, when the faulty secondary board is any signal processing secondary board, acquire the input power consumption of the signal processing secondary board under normal operating conditions and the real-time input power consumption of the signal processing secondary board; determine the real-time input power consumption change information of the signal processing secondary board based on the input power consumption of the signal processing secondary board under normal operating conditions and the real-time input power consumption of the signal processing secondary board; and confirm that the signal processing secondary board is a faulty secondary board when the real-time input power consumption change information of the signal processing secondary board indicates that the real-time input power consumption of the signal processing secondary board is abnormal.

[0123] In one embodiment, the device further includes: a verification module, configured to acquire the real-time output power consumption of the power supply secondary board when the faulty secondary board is a power supply secondary board; and to confirm that the power supply secondary board is a faulty secondary board when the power consumption difference between the real-time output power consumption and the real-time input power consumption of the power supply secondary board deviates from the power consumption difference of the power supply secondary board under normal operating conditions.

[0124] In one embodiment, the acquisition module 602 is specifically used to apply a rated voltage to the capacitor that supplies power to the secondary board of the power supply using a high-voltage DC power supply under a standard test environment; after the voltage of the capacitor stabilizes, acquire the output current of the high-voltage DC power supply; and determine the input power consumption of the secondary board of the power supply under normal operating conditions based on the output current of the high-voltage DC power supply.

[0125] In one embodiment, the acquisition module 602 is specifically used to acquire the real-time input current signal and the real-time input voltage signal of the power supply secondary board; and to determine the real-time input power consumption of the power supply secondary board based on the real-time input current signal and the real-time input voltage signal.

[0126] In one exemplary embodiment, this application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any of the fault monitoring methods for power consumption of the secondary board of a flexible DC converter valve in the above embodiments.

[0127] In one exemplary embodiment, this application also provides a computer device, including a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the steps of any of the fault monitoring methods based on the power consumption of the secondary board of the flexible DC converter valve in the above embodiments.

[0128] In one exemplary embodiment, this application also provides a computer program product, including a computer program that, when executed by a processor, implements the steps of any of the fault monitoring methods based on the power consumption of the secondary board of a flexible DC converter valve as described in the above embodiments.

[0129] Indicatively, such as Figure 7 As shown, Figure 7 This is a schematic diagram of the internal structure of a computer device 700 provided in an embodiment of this application. The computer device 700 can be provided as a server. (Refer to...) Figure 7 The computer device 700 includes a processing component 702, which further includes one or more processors, and memory resources represented by memory 701 for storing instructions, such as application programs, that can be executed by the processing component 702. The application programs stored in memory 701 may include one or more modules, each corresponding to a set of instructions. Furthermore, the processing component 702 is configured to execute instructions to perform the service extension method of the collection system of any of the above embodiments.

[0130] The computer device 700 may also include a power supply component 703 configured to perform power management of the computer device 700, a wired or wireless network interface 704 configured to connect the computer device 700 to a network, and an input / output (I / O) interface 705. The computer device 700 can operate on an operating system stored in memory 701, such as Windows Server™, Mac OS X™, Unix™, Linux™, Free BSD™, or similar.

[0131] Those skilled in the art will understand that Figure 7 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0132] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0133] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The various embodiments can be combined as needed, and the same or similar parts can be referred to each other.

[0134] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A fault monitoring method based on the power consumption of a flexible DC converter valve secondary board, characterized in that, An application is made to a flexible DC-DC converter valve, the flexible DC-DC converter valve including a power supply secondary board and at least one signal processing secondary board, the power supply secondary board being used to supply power to each of the signal processing secondary boards, the method comprising: The input power consumption of the secondary circuit board under normal operating conditions is obtained, and the real-time input power consumption of the secondary circuit board is obtained. Based on the real-time input power consumption of the power supply secondary board and the input power consumption of the power supply secondary board under normal operating conditions, determine the real-time input power consumption change information of the power supply secondary board. When the real-time input power consumption change information of the power supply secondary board indicates that the real-time input power consumption of the power supply secondary board is abnormal, the faulty secondary board is identified among the power supply secondary board and each of the signal processing secondary boards based on the real-time input power consumption change information of the power supply secondary board.

2. The method according to claim 1, characterized in that, The step of identifying the faulty secondary board among the power supply secondary board and each of the signal processing secondary boards based on the real-time input power consumption change information of the power supply secondary board includes: Obtain the mapping relationship between pre-built input power consumption change information and secondary board fault characteristics; Based on the mapping relationship, the fault characteristics of the target secondary board that match the real-time input power consumption change information of the power supply secondary board are determined. Based on the fault characteristics of the target secondary board, the faulty secondary board is identified among the power supply secondary board and each of the signal processing secondary boards.

3. The method according to claim 1, characterized in that, After the step of identifying the faulty secondary board, the method further includes: If the faulty secondary board is any of the aforementioned signal processing secondary boards, obtain the input power consumption of the signal processing secondary board under normal operating conditions and the real-time input power consumption of the signal processing secondary board. Based on the input power consumption of the signal processing secondary board under normal operating conditions and the real-time input power consumption of the signal processing secondary board, the real-time input power consumption change information of the signal processing secondary board is determined. If the real-time input power consumption change information of the signal processing secondary board indicates that the real-time input power consumption of the signal processing secondary board is abnormal, the signal processing secondary board is confirmed to be the faulty secondary board.

4. The method according to claim 1, characterized in that, After the step of identifying the faulty secondary board, the method further includes: If the faulty secondary board is the power supply secondary board, obtain the real-time output power consumption of the power supply secondary board. If the power consumption difference between the real-time output power consumption and the real-time input power consumption of the power supply secondary board deviates from the power consumption difference of the power supply secondary board under normal operating conditions, the power supply secondary board is confirmed to be the faulty secondary board.

5. The method according to any one of claims 1-4, characterized in that, The step of obtaining the input power consumption of the secondary circuit board of the power supply under normal operating conditions includes: Under standard test conditions, a high-voltage DC power supply is used to apply the rated voltage to the capacitor that supplies power to the secondary board of the power supply. After the voltage of the capacitor stabilizes, the output current of the high-voltage DC power supply is obtained; Based on the output current of the high-voltage DC power supply, the input power consumption of the secondary board of the power supply under normal operating conditions is determined.

6. The method according to any one of claims 1-4, characterized in that, The step of obtaining the real-time input power consumption of the power supply secondary board includes: Acquire the real-time input current signal and real-time input voltage signal of the power supply secondary board; Based on the real-time input current signal and the real-time input voltage signal, the real-time input power consumption of the power supply secondary board is determined.

7. A fault monitoring device based on the power consumption of a flexible DC converter valve secondary board, characterized in that, An application is made to a flexible DC-DC converter valve, the flexible DC-DC converter valve including a power supply secondary board and at least one signal processing secondary board, the power supply secondary board being used to supply power to each of the signal processing secondary boards, the device comprising: The acquisition module is used to acquire the input power consumption of the secondary board of the power supply under normal operating conditions, and to acquire the real-time input power consumption of the secondary board of the power supply. The determination module is used to determine the real-time input power consumption change information of the power supply secondary board based on the real-time input power consumption of the power supply secondary board and the input power consumption of the power supply secondary board under normal operating conditions. The identification module is used to identify the faulty secondary board among the power supply secondary board and each of the signal processing secondary boards based on the real-time input power consumption change information of the power supply secondary board when the real-time input power consumption of the power supply secondary board indicates that the power supply secondary board is abnormal.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 6.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 6.

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