CN113917320B - Converter valve fault early warning method and system - Google Patents
Converter valve fault early warning method and system Download PDFInfo
- Publication number
- CN113917320B CN113917320B CN202111495890.4A CN202111495890A CN113917320B CN 113917320 B CN113917320 B CN 113917320B CN 202111495890 A CN202111495890 A CN 202111495890A CN 113917320 B CN113917320 B CN 113917320B
- Authority
- CN
- China
- Prior art keywords
- thyristor
- return signal
- preset
- level loop
- time difference
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2832—Specific tests of electronic circuits not provided for elsewhere
- G01R31/2836—Fault-finding or characterising
- G01R31/2843—In-circuit-testing
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Power Conversion In General (AREA)
Abstract
The invention discloses a converter valve fault early warning method and a system, wherein the method comprises the following steps: receiving a return signal sent by each thyristor trigger monitoring unit, and comparing each return signal with a preset return signal to obtain an initial time difference between each return signal and the preset return signal; if the time difference between the initial time of the return signal and the initial time of the preset return signal reaches a preset time difference threshold value, determining that the thyristor-level loop parameter corresponding to the return signal changes; and detecting parameters of each component in the thyristor-level loop with changed parameters, and judging the fault of the thyristor-level loop when the variable quantity of the parameters of each component in the thyristor-level loop exceeds a corresponding preset transformation quantity threshold value, thereby realizing the online monitoring of the equivalent impedance of the thyristor-level loop and the fault diagnosis of the thyristor.
Description
Technical Field
The invention relates to the field of direct current transmission, in particular to a converter valve fault early warning method and system.
Background
The extra-high voltage direct current converter valve is the core equipment of direct current transmission, and a single converter valve is generally composed of dozens to hundreds of thyristors (thyristor) connected in series, as shown in fig. 1. In order to ensure that the voltage of each thyristor is uniformly distributed, a damping loop and a direct current voltage-sharing loop II (damping voltage-sharing loop) are connected in parallel at two ends of each thyristor: 1) the damping loop is formed by connecting a damping capacitor (c) and a damping resistor (c) in series, and has the functions of reducing the commutation voltage overshoot of the converter valve during the turn-off recovery period of the thyristor and simultaneously playing a role of dynamically equalizing the voltage of the series thyristor, thereby protecting the thyristor from being damaged by turn-off overvoltage and keeping the voltage uniformly distributed; 2) the dc voltage-sharing circuit is usually composed of a plurality of resistors connected in series, and is used for maintaining the steady voltage sharing at both ends of each thyristor. Therefore, the converter valve thyristor and its damping circuit and the dc voltage equalizing circuit are the most basic functional units of the whole converter valve. The damping loop and the direct current voltage-sharing loop are key components for ensuring the safe operation of the thyristor.
When the converter valve operates, the larger the damping capacitance value is, the smaller the phase-change overvoltage peak value of the converter valve is, but the loss of the converter valve can be increased, and the long-term operation of the converter valve is not facilitated. However, if the damping capacitance value is too small, the damping capacitance value cannot play a role in damping the commutation overvoltage of the converter valve, and the thyristor is in the risk of being broken down by the overvoltage. The direct current equalizing resistor enables the voltage at two ends of each thyristor and the damping loop to be uniformly distributed, and if the direct current equalizing resistor, the damping resistor and the damping capacitor are damaged or parameters are abnormal, the voltage distribution of the thyristor level connected in series is not uniform, so that various faults can occur in the thyristor level, and even the thyristors can be broken down. Therefore, parameters of the direct-current voltage-sharing resistor, the damping resistor and the damping capacitor are critical to safe and stable operation of the whole converter valve, and the parameters need to be guaranteed to be within a design range in operation and maintenance of the converter valve.
At present, in direct current transmission projects at home and abroad, parameters of the resistance value of a damping resistor, the capacitance value of a damping capacitor and the resistance value of a direct current equalizing resistor of a converter valve are only detected during annual maintenance, and maintenance work such as replacement is carried out according to a measurement result, namely, only regular maintenance is carried out. The operation and maintenance method has the following defects: 1) there is hysteresis. In the two annual overhaul periods, when the damping capacitor, the damping resistor and the direct current voltage-sharing resistor have faults in the operation process of the converter valve, so that parameters are changed and exceed an allowable range, uneven voltage division is caused, and the risk of equipment damage or fault range expansion is caused. 2) The operation and maintenance efficiency is low. In order to guarantee that parameters of the damping capacitor, the damping resistor and the direct-current voltage-sharing resistor are comprehensively mastered, a large amount of detection work needs to be carried out during annual maintenance, maintenance time of a converter valve of a converter station generally needs about 10 days, time and labor are wasted, and improvement of equipment availability and maintenance efficiency is not facilitated.
Disclosure of Invention
Therefore, the invention aims to overcome the defects that the fault early warning cannot be realized on the converter valve in the prior art, so that the fault is caused, and the equipment availability is relatively low due to the fact that the converter valve can only be periodically overhauled, so that the invention provides the converter valve fault early warning method and the converter valve fault early warning system.
In order to achieve the purpose, the invention provides the following technical scheme:
in a first aspect, an embodiment of the present invention provides a fault early warning method for a converter valve, where the converter valve is composed of multiple bridge arms, each bridge arm has multiple thyristor-level loops connected in series, and each thyristor-level loop is connected to a thyristor trigger monitoring unit, and the fault early warning method includes: receiving a return signal sent by each thyristor trigger monitoring unit, and comparing each return signal with a preset return signal to obtain an initial time difference between each return signal and the preset return signal; if the time difference between the initial time of the return signal and the initial time of the preset return signal reaches a preset time difference threshold value, determining that the thyristor-level loop parameter corresponding to the return signal changes; and detecting parameters of each component in the thyristor-level loop with changed parameters, and judging that the thyristor-level loop has a fault when the variation of the parameters of each component in the thyristor-level loop exceeds a corresponding preset variation threshold.
In an embodiment, before receiving the report signal sent by each thyristor triggering monitoring unit, the method further includes: the thyristor trigger monitoring unit monitors the electrical parameters of the thyristor-level loop in real time; the thyristor triggering monitoring unit generates a return signal when the energy taking is completed and the thyristor triggering monitoring unit monitors that the electrical parameter of the thyristor-level loop reaches a first preset threshold value.
In an embodiment, before receiving the report signal sent by each thyristor triggering monitoring unit, the method further includes: the thyristor trigger monitoring unit monitors the electrical parameters of the thyristor-level loop in real time; and when the thyristor trigger monitoring unit monitors that the electrical parameter of the thyristor-level loop reaches a second preset threshold value, a return signal is generated.
In an embodiment, the variation of the thyristor-level loop parameter and the type of the thyristor-level loop fault are determined based on the sign of the time difference between the initial time of the return signal and the predetermined time of the return signal.
In one embodiment, the thyristor-level loop comprises a thyristor, a voltage-sharing resistor, a damping capacitor and a damping resistor, wherein the damping capacitor is connected in series with the damping resistor and then is respectively connected in parallel with the thyristor and the voltage-sharing resistor; when the time difference between the initial time of the return signal and the preset return signal is a positive value, the return signal is judged to lag behind the preset return signal, and the equivalent impedance of a circuit formed by the voltage-sharing resistor, the damping capacitor and the damping resistor is reduced; when the time difference between the initial time of the return signal and the preset return signal is a negative value, the return signal is determined to be ahead of the preset return signal, and the equivalent impedance of a circuit formed by the voltage-sharing resistor, the damping capacitor and the damping resistor is increased.
In an embodiment, the converter valve fault early warning method further includes: storing the initial time difference between the received return signal sent by each thyristor trigger monitoring unit and a preset return signal, and obtaining the time difference historical curve of each thyristor level loop; obtaining the historical variation trend of the parameters of each component in each thyristor level loop based on the time difference historical curve of each thyristor level loop; based on the historical variation trend of each component parameter in each thyristor-level loop, when the initial time difference between the real-time received return signal and the preset return signal indicates that each component parameter in the thyristor-level loop changes towards the direction of the abnormal parameter, and the time difference approaches the preset time difference threshold, the fault of the thyristor-level loop corresponding to the return signal is judged.
In a second aspect, an embodiment of the present invention provides a converter valve fault early warning system, including: the return signal module is used for receiving the return signals sent by each thyristor trigger monitoring unit, comparing each return signal with a preset return signal and obtaining the time difference of the initial moment of each return signal and the preset return signal; the parameter judging module is used for judging that the thyristor-level loop parameter corresponding to the return signal changes if the time difference between the initial moments of the return signal and the preset return signal reaches a preset time difference threshold value; and the fault judging module is used for detecting parameters of each component in the thyristor level loop with changed parameters, and judging the fault of the thyristor level loop when the variable quantity of each component parameter in the thyristor level loop exceeds the corresponding preset transformation quantity threshold value.
In a third aspect, an embodiment of the present invention provides a computer device, including: the converter valve fault early warning method comprises at least one processor and a memory which is in communication connection with the at least one processor, wherein the memory stores instructions which can be executed by the at least one processor, and the instructions are executed by the at least one processor so as to enable the at least one processor to execute the converter valve fault early warning method of the first aspect of the embodiment of the invention.
In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, where computer instructions are stored, and the computer instructions are configured to cause a computer to execute the method for early warning of a converter valve fault according to the first aspect of the embodiment of the present invention.
The technical scheme of the invention has the following advantages:
1. the converter valve fault early warning method and the converter valve fault early warning system receive the return signals sent by each thyristor trigger monitoring unit, compare each return signal with the preset return signal, and obtain the time difference of the initial moment of each return signal and the preset return signal; if the time difference between the initial time of the return signal and the initial time of the preset return signal reaches a preset time difference threshold value, determining that the thyristor-level loop parameter corresponding to the return signal changes; and detecting parameters of each component in the thyristor-level loop with changed parameters, and judging the fault of the thyristor-level loop when the variable quantity of the parameters of each component in the thyristor-level loop exceeds a corresponding preset transformation quantity threshold value, thereby realizing the online monitoring of the equivalent impedance of the thyristor-level loop and the fault diagnosis of the thyristor.
2. According to the converter valve fault early warning method and system provided by the invention, the initial time difference between the received return signal sent by each thyristor trigger monitoring unit and the preset return signal is stored, and the time difference history curve of each thyristor level loop is obtained; obtaining the historical variation trend of the parameters of each component in each thyristor level loop based on the time difference historical curve of each thyristor level loop; based on the historical variation trend of parameters of each component in each thyristor level loop, when the initial time difference between the real-time received return signal and the preset return signal indicates that the parameters of each component in each thyristor level loop change towards the direction of abnormal parameters, and the time difference approaches the preset time difference threshold, the fault of the thyristor level loop corresponding to the return signal is judged, so that the prejudgment of the running state of the thyristor is realized, the maintenance strategy is formulated in time, the maintenance time of equipment is reduced, and the availability of the equipment is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a converter valve according to an embodiment of the present invention;
fig. 2 is a flowchart of a converter valve fault early warning method according to an embodiment of the present invention;
fig. 3 is a schematic diagram of the operating voltage (for example, the inversion side) at two ends of the thyristor stage and the energy-taking return signal according to the embodiment of the present invention;
fig. 4 is a schematic diagram of the return signal of the operating voltage (for example, the inversion side) at two ends of the thyristor stage and any voltage value according to the embodiment of the present invention;
fig. 5 is a block diagram of a converter valve fault warning system according to an embodiment of the present invention;
fig. 6 is a composition diagram of a specific example of a computer device according to an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
The embodiment of the invention provides a converter valve fault early warning method, which is applied to the occasions of monitoring the parameters of thyristor-level loops and maintaining the converter valve, as shown in fig. 1, the converter valve is composed of a plurality of bridge arms, each bridge arm is provided with a plurality of thyristor-level loops connected in series, each thyristor-level loop is connected with a thyristor trigger monitoring unit, and the thyristor trigger monitoring unit is used for monitoring the trigger control, protection and running state of a thyristor, wherein the running state monitoring function mainly comprises the information of the trigger monitoring unit energy obtaining state, the thyristor protection trigger state, the thyristor fault state and the like, and the information is fed back to an upper monitoring system in real time through a return signal optical fiber channel, such as valve base electronic equipment, as shown in fig. 2, the fault early warning method comprises the following steps:
step S11: and receiving the return signal sent by each thyristor trigger monitoring unit, and comparing each return signal with a preset return signal to obtain the time difference of the initial moment of each return signal and the preset return signal.
Based on a control signal sent by the valve-based electronic device, the thyristor trigger monitoring unit of the embodiment of the invention triggers or turns off the thyristor, monitors the running state of the thyristor and the electrical parameters of the thyristor-level loop, and judges whether the thyristor-level loop parameters change or not by judging the time for receiving the return signal sent by the thyristor trigger monitoring unit in order to realize the monitoring of the thyristor-level loop parameter change.
Specifically, the process of generating the report signal by the thyristor trigger monitoring unit includes steps S21 to S22:
step S21: the thyristor trigger monitoring unit monitors the electrical parameters of the thyristor-level loop in real time.
Step S22: the thyristor triggering monitoring unit generates a return signal when the energy taking is completed and the thyristor triggering monitoring unit monitors that the electrical parameter of the thyristor-level loop reaches a first preset threshold value.
Specifically, the thyristor triggering monitoring unit according to the embodiment of the present invention may be a monitoring unit in the prior art, and may determine whether the parameter of the thyristor-level loop changes by using a characteristic that the thyristor triggering monitoring unit automatically generates the return signal after the energy is taken and the voltage across the thyristor reaches the first preset threshold, and when the parameters of the damping capacitor, the damping resistor, and the dc voltage-sharing resistor in a certain thyristor-level loop in a single converter valve change, the voltage sharing of the thyristor-level loop in the single converter valve also changes, which causes a situation that the time when the thyristor triggering monitoring unit generates the return signal is different, and by detecting the initial time when each return signal is received.
Specifically, as shown in fig. 3, after the voltages at the two ends of the thyristor reach the first preset threshold, the thyristor trigger monitoring unit generates a return signal (r) - (⑬), wherein the return signals (r), (⑫) correspond to the voltages (r), the return signals (⑪), (⑬) correspond to the voltages (n), and assuming that the voltage (r) is the preset return signal, the delay time difference of the return signal of the voltage (n) is Δ t.
Specifically, the process of generating the report signal by the thyristor trigger monitoring unit may further include steps S31 to S32:
step S31: the thyristor trigger monitoring unit monitors the electrical parameters of the thyristor-level loop in real time.
Step S32: and when the thyristor trigger monitoring unit monitors that the electrical parameter of the thyristor-level loop reaches a second preset threshold value, a return signal is generated.
Specifically, the thyristor triggering monitoring unit according to the embodiment of the present invention may be a dedicated monitoring unit, which generates the return signal when the voltage across the thyristor reaches a second preset threshold value, instead of the energy being taken, where the first preset threshold value and the second preset threshold value are set according to an actual test condition.
Specifically, as shown in fig. 4, after the voltages at the two ends of the thyristor reach the second predetermined threshold, the thyristor trigger monitoring unit generates the return signals ⑰ - ⑳, wherein the return signals ⑰, ⑲ correspond to the voltage ⑮, the return signals ⑱, ⑳ correspond to the voltage ⑯, and assuming that the voltage ⑮ is the predetermined return signal, the delay time difference Δ t of the return signal of the voltage ⑯ is obtained.
It should be noted that the preset return signal in the embodiment of the present invention may be a return signal test performed on a thyristor having factory data parameters, and the thyristor trigger monitoring unit generates the preset return signal according to steps S21 to S22 and steps S31 to S32, or, since the converter valve includes multiple stages of thyristors, there are voltage waveforms of dozens of stages of thyristors in actual operation, and each waveform corresponds to one return signal, and the relative positions of all the return signals are counted, and parameters of most thyristors of the converter valve are not reliably changed much, so that the return signal for the thyristor which is not reliably changed much can be used as the preset return signal, and the return signal with a large relative deviation is found based on the preset return signal.
Step S12: and if the time difference between the initial time of the return signal and the initial time of the preset return signal reaches a preset time difference threshold value, determining that the thyristor-level loop parameter corresponding to the return signal changes.
When parameters of a damping capacitor, a damping resistor and a direct current voltage-sharing resistor in a certain thyristor-level loop in a single converter valve change, voltage sharing of the thyristor-level loop in the single converter valve also changes, so that the time when the thyristor trigger monitoring unit generates the return signals is different.
Specifically, the embodiment of the present invention determines the parameter variation condition of the thyristor-level loop and the fault type of the thyristor-level loop based on the positive and negative characteristics of the time difference between the initial time of the return signal and the predetermined return signal. It should be noted that the above-mentioned determination principle is based on a time difference obtained by subtracting an initial time of the return signal from an initial time of the preset return signal, if the time difference is the initial time of the preset return signal and the initial time of the return signal, the return signal leads the preset return signal when the time difference is a positive value, and the return signal lags the preset return signal when the time difference is a negative value.
Specifically, when the time difference (specifically, the absolute value of the time difference) reaches a preset time difference threshold, determining that the equivalent parameter of the thyristor-level loop changes, where if the thyristor-level loop includes a thyristor, a voltage-sharing resistor, a damping capacitor, and a damping resistor, the damping capacitor is connected in series with the damping resistor and then connected in parallel with the thyristor and the voltage-sharing resistor, respectively, taking a time difference obtained by subtracting an initial time of the return signal from an initial time of a preset return signal as an example, when the time difference between the initial time of the return signal and the initial time of the preset return signal is a positive value, determining that the return signal lags behind the preset return signal, and reducing the equivalent impedance of a circuit formed by the voltage-sharing resistor, the damping capacitor, and the damping resistor, such as the capacitance value of the damping capacitor increases; when the time difference between the initial time of the return signal and the preset return signal is a negative value, it is determined that the return signal is ahead of the preset return signal, and the equivalent impedance of a circuit formed by the voltage-sharing resistor, the damping capacitor and the damping resistor is increased, for example, the resistance value of the damping resistor is decreased, and the capacitance value of the damping capacitor is increased.
It should be noted that, when the specific circuit structure of the thyristor-level loop is not limited to the circuit structure shown in fig. 1, the above-mentioned determination method can be also used to determine whether the parameter of the thyristor-level loop is changed.
Step S13: and detecting parameters of each component in the thyristor-level loop with changed parameters, and judging that the thyristor-level loop has a fault when the variation of the parameters of each component in the thyristor-level loop exceeds a corresponding preset variation threshold.
In the embodiment of the invention, when the parameter change of the thyristor level loop is judged, the detection instrument is used for detecting the parameters of each component in the thyristor level loop, the detection result is compared with the factory data of the thyristor level loop, and when the comparison result shows that the variation of the parameters of each component in the thyristor level loop exceeds the corresponding preset transformation threshold, the fault of the thyristor level loop is judged.
In a specific embodiment, the converter valve fault early warning method further includes:
step S41: and storing the initial time difference between the received return signal sent by each thyristor trigger monitoring unit and a preset return signal, and obtaining a time difference historical curve of each thyristor level loop.
Step S42: and obtaining the historical variation trend of the parameters of each component in each thyristor level loop based on the time difference historical curve of each thyristor level loop.
Step S43: based on the historical variation trend of each component parameter in each thyristor-level loop, when the initial time difference between the real-time received return signal and the preset return signal indicates that each component parameter in the thyristor-level loop changes towards the direction of the abnormal parameter, and the time difference approaches the preset time difference threshold, the fault of the thyristor-level loop corresponding to the return signal is judged.
Specifically, the time difference Δ t of the return signal of each thyristor-level loop monitored in real time is stored, and a time difference history curve is formed. And analyzing the time difference historical curve to obtain the variation trend of the parameters of the damping capacitor, the damping resistor and the direct current equalizing resistor of each thyristor-level loop. When the damping capacitance, the damping resistance and the direct current equalizing resistance parameters of one or some thyristor-level loops continuously change towards the direction of the abnormal parameters and approach the preset time difference threshold, the hidden fault danger can be pre-judged in advance and reported to an expert system to report the pre-judgment condition of the fault.
The embodiment of the invention adopts the factory data of the thyristor damping capacitor, the damping resistor and the direct current voltage-sharing resistor, diagnoses the running state and fault diagnosis of the thyristor in real time, combines the data fusion and intelligent diagnosis of the overhaul record of the converter valve, the running condition of the direct current system and the like, and formulates the state overhaul strategy of the damping capacitor, the damping resistor and the direct current voltage-sharing resistor, thereby realizing intelligent operation and maintenance.
Example 2
An embodiment of the present invention provides a converter valve fault early warning system, as shown in fig. 5, including:
the return signal module 1 is configured to receive a return signal sent by each thyristor trigger monitoring unit, compare each return signal with a preset return signal, and obtain an initial time difference between each return signal and the preset return signal; this module executes the method described in step S11 in embodiment 1, and is not described herein again.
The parameter judging module 2 is configured to judge that a thyristor-level loop parameter corresponding to the return signal changes if a time difference between the initial time of the return signal and a preset time difference threshold reaches a preset time difference threshold; this module executes the method described in step S12 in embodiment 1, and is not described herein again.
The fault judging module 3 is used for detecting parameters of each component in the thyristor-level loop with changed parameters, and judging the fault of the thyristor-level loop when the variation of the parameters of each component in the thyristor-level loop exceeds the corresponding preset variation threshold; this module executes the method described in step S13 in embodiment 1, and is not described herein again.
Example 3
An embodiment of the present invention provides a computer device, as shown in fig. 6, including: at least one processor 401, such as a CPU (Central Processing Unit), at least one communication interface 403, memory 404, and at least one communication bus 402. Wherein a communication bus 402 is used to enable connective communication between these components. The communication interface 403 may include a Display (Display) and a Keyboard (Keyboard), and the optional communication interface 403 may also include a standard wired interface and a standard wireless interface. The Memory 404 may be a RAM (random Access Memory) or a non-volatile Memory (non-volatile Memory), such as at least one disk Memory. The memory 404 may optionally be at least one memory device located remotely from the processor 401. Wherein the processor 401 may execute the converter valve fault warning method of embodiment 1. A set of program codes is stored in the memory 404 and the processor 401 calls the program codes stored in the memory 404 for performing the converter valve malfunction alerting method of embodiment 1.
The communication bus 402 may be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The communication bus 402 may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one line is shown in FIG. 6, but it is not intended that there be only one bus or one type of bus.
The memory 404 may include a volatile memory (RAM), such as a random-access memory (RAM); the memory may also include a non-volatile memory (english: non-volatile memory), such as a flash memory (english: flash memory), a hard disk (english: hard disk drive, abbreviated: HDD) or a solid-state drive (english: SSD); the memory 404 may also comprise a combination of memories of the kind described above.
The processor 401 may be a Central Processing Unit (CPU), a Network Processor (NP), or a combination of a CPU and an NP.
The processor 401 may further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a Programmable Logic Device (PLD), or a combination thereof. The PLD may be a Complex Programmable Logic Device (CPLD), a field-programmable gate array (FPGA), a General Array Logic (GAL), or any combination thereof.
Optionally, the memory 404 is also used to store program instructions. The processor 401 may call a program instruction to implement the converter valve fault early warning method in embodiment 1 executed in this application.
The embodiment of the invention also provides a computer-readable storage medium, wherein a computer-executable instruction is stored on the computer-readable storage medium, and the computer-executable instruction can execute the converter valve fault early warning method in the embodiment 1. The storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a Flash Memory (Flash Memory), a Hard Disk (Hard Disk Drive, abbreviated as HDD), a Solid-State Drive (SSD), or the like; the storage medium may also comprise a combination of memories of the kind described above.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.
Claims (7)
1. The fault early warning method for the converter valve is characterized in that the converter valve is composed of a plurality of bridge arms, each bridge arm is provided with a plurality of thyristor-level loops connected in series, each thyristor-level loop is connected with one thyristor trigger monitoring unit, and the fault early warning method comprises the following steps:
receiving a return signal sent by each thyristor trigger monitoring unit, and comparing each return signal with a preset return signal to obtain an initial time difference between each return signal and the preset return signal;
if the time difference between the initial time of the return signal and the initial time of the preset return signal reaches a preset time difference threshold value, determining that the thyristor-level loop parameter corresponding to the return signal changes;
detecting parameters of each component in the thyristor-level loop with changed parameters, and judging that the thyristor-level loop has a fault when the variation of the parameters of each component in the thyristor-level loop exceeds a corresponding preset variation threshold;
judging the parameter change condition of the thyristor-level loop and the fault type of the thyristor-level loop based on the positivity and the negativity of the initial time difference between the return signal and the preset return signal;
the thyristor-level loop comprises a thyristor, a voltage-sharing resistor, a damping capacitor and a damping resistor, wherein the damping capacitor is connected with the damping resistor in series and then is respectively connected with the thyristor and the voltage-sharing resistor in parallel;
when the time difference between the initial time of the return signal and the initial time of the preset return signal is a positive value, the return signal is judged to lag behind the preset return signal, and the equivalent impedance of a circuit formed by the voltage-sharing resistor, the damping capacitor and the damping resistor is reduced; when the time difference between the initial time of the return signal and the initial time of the preset return signal is a negative value, the return signal is judged to be ahead of the preset return signal, and the equivalent impedance of a circuit formed by the voltage-sharing resistor, the damping capacitor and the damping resistor is increased.
2. The converter valve fault early warning method according to claim 1, wherein before receiving the report signal sent by each thyristor trigger monitoring unit, the method further comprises:
the thyristor trigger monitoring unit monitors the electrical parameters of the thyristor-level loop in real time;
the thyristor triggering monitoring unit generates a return signal when the energy taking is completed and the thyristor triggering monitoring unit monitors that the electrical parameter of the thyristor-level loop reaches a first preset threshold value.
3. The converter valve fault early warning method according to claim 1, wherein before receiving the report signal sent by each thyristor trigger monitoring unit, the method further comprises:
the thyristor trigger monitoring unit monitors the electrical parameters of the thyristor-level loop in real time;
and when the thyristor trigger monitoring unit monitors that the electrical parameter of the thyristor-level loop reaches a second preset threshold value, a return signal is generated.
4. The converter valve fault early warning method according to claim 1, further comprising:
storing the initial time difference between the received return signal sent by each thyristor trigger monitoring unit and a preset return signal, and obtaining the time difference historical curve of each thyristor level loop;
obtaining the historical variation trend of the parameters of each component in each thyristor level loop based on the time difference historical curve of each thyristor level loop;
based on the historical variation trend of each component parameter in each thyristor-level loop, when the initial time difference between the real-time received return signal and the preset return signal indicates that each component parameter in the thyristor-level loop changes towards the direction of the abnormal parameter, and the time difference approaches the preset time difference threshold, the fault of the thyristor-level loop corresponding to the return signal is judged.
5. A converter valve fault early warning system, characterized by includes:
the return signal module is used for receiving the return signals sent by each thyristor trigger monitoring unit, comparing each return signal with a preset return signal and obtaining the time difference of the initial moment of each return signal and the preset return signal;
the parameter judging module is used for judging that the thyristor-level loop parameter corresponding to the return signal changes if the time difference between the initial moments of the return signal and the preset return signal reaches a preset time difference threshold value;
the fault judging module is used for detecting parameters of each component in the thyristor level loop with changed parameters, and judging the fault of the thyristor level loop when the variable quantity of each component parameter in the thyristor level loop exceeds a corresponding preset transformation quantity threshold value;
judging the parameter change condition of the thyristor-level loop and the fault type of the thyristor-level loop based on the positivity and the negativity of the initial time difference between the return signal and the preset return signal;
the thyristor-level loop comprises a thyristor, a voltage-sharing resistor, a damping capacitor and a damping resistor, wherein the damping capacitor is connected with the damping resistor in series and then is respectively connected with the thyristor and the voltage-sharing resistor in parallel;
when the time difference between the initial time of the return signal and the initial time of the preset return signal is a positive value, the return signal is judged to lag behind the preset return signal, and the equivalent impedance of a circuit formed by the voltage-sharing resistor, the damping capacitor and the damping resistor is reduced; when the time difference between the initial time of the return signal and the initial time of the preset return signal is a negative value, the return signal is judged to be ahead of the preset return signal, and the equivalent impedance of a circuit formed by the voltage-sharing resistor, the damping capacitor and the damping resistor is increased.
6. A computer device, comprising: at least one processor, and a memory communicatively coupled to the at least one processor, wherein the memory stores instructions executable by the at least one processor, the instructions being executable by the at least one processor to cause the at least one processor to perform the converter valve malfunction alerting method of any of claims 1-4.
7. A computer-readable storage medium storing computer instructions for causing a computer to perform the converter valve fault warning method according to any one of claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111495890.4A CN113917320B (en) | 2021-12-09 | 2021-12-09 | Converter valve fault early warning method and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111495890.4A CN113917320B (en) | 2021-12-09 | 2021-12-09 | Converter valve fault early warning method and system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113917320A CN113917320A (en) | 2022-01-11 |
| CN113917320B true CN113917320B (en) | 2022-03-11 |
Family
ID=79248808
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111495890.4A Active CN113917320B (en) | 2021-12-09 | 2021-12-09 | Converter valve fault early warning method and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113917320B (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105182222A (en) * | 2014-06-17 | 2015-12-23 | 国家电网公司 | Device and method for testing forward recovery characteristics of thyristor based on synthesis loop |
| CN106646007B (en) * | 2015-10-29 | 2019-05-21 | 国网智能电网研究院 | A kind of HVDC thyristor grade damping circuit dynamic parameter on-line monitoring method |
| CN107643454A (en) * | 2016-07-20 | 2018-01-30 | 全球能源互联网研究院 | A kind of high voltage direct current converter valve on-line monitoring system |
| CN111965511A (en) * | 2020-07-06 | 2020-11-20 | 国网宁夏电力有限公司检修公司 | Method, system and medium for detecting fault of thyristor circuit |
| CN112505496B (en) * | 2020-11-03 | 2021-08-27 | 西安交通大学 | Thyristor real-time diagnosis and prediction method for insulation abnormity in converter valve |
-
2021
- 2021-12-09 CN CN202111495890.4A patent/CN113917320B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN113917320A (en) | 2022-01-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP7005771B2 (en) | Power monitoring method, system and power supply | |
| US10983154B2 (en) | Load state detection circuit and method | |
| CN109406989B (en) | Load loop detection method, load detection circuit and electronic equipment | |
| US11888321B2 (en) | Power conversion apparatus and method for controlling output impedance of power conversion apparatus | |
| CN112255552B (en) | Fault diagnosis method and device for temperature acquisition device of fuel cell and vehicle | |
| CN115808640A (en) | Power failure detection circuit, method, system, electronic device, and storage medium | |
| CN104749467A (en) | Distribution terminal self-diagnostic method and system | |
| CN109459633B (en) | Method, device and system for diagnosing fault of thyristor-level circuit of direct-current transmission converter valve | |
| CN113917320B (en) | Converter valve fault early warning method and system | |
| CN218041199U (en) | Short-circuit fault protection circuit and photovoltaic inverter circuit | |
| CN113282160A (en) | UPS service life prediction method, equipment and computer readable storage medium | |
| CN110504734B (en) | Electrolytic capacitor charging control method and device of frequency converter and frequency converter | |
| CN113872164B (en) | Power distribution protection method, device, system and storage medium | |
| CN113985195B (en) | Method and system for judging stealing and tripping of circuit breaker based on power grid fault time sequence | |
| CN114584041A (en) | Control method and device of servo driver | |
| CN113608091A (en) | Double-pulse test protection method and device | |
| CN110867920A (en) | Charging control method and device of battery system, electronic equipment and battery system | |
| CN112798869A (en) | Capacitance detection method and system for unit series type converter | |
| CN112083221B (en) | Fault detection method and device and electrical equipment | |
| CN111239460B (en) | Sampling circuit and electrical equipment | |
| CN117526544B (en) | Control method and system of UPS module, electronic equipment and storage medium | |
| CN117691845A (en) | Short-circuit fault protection circuit, control method and device thereof, and medium | |
| CN114435135B (en) | Relay state determining method and device, electronic equipment and storage medium | |
| CN117220653B (en) | Solid-state switch control method, solid-state switch system, control unit and storage medium | |
| CN116125342B (en) | Harmonic detection system, method and device for direct current and storage medium |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |