CN115639450A - Online monitoring method of MMC flexible direct current converter valve IGBT health state monitoring system - Google Patents
Online monitoring method of MMC flexible direct current converter valve IGBT health state monitoring system Download PDFInfo
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- CN115639450A CN115639450A CN202211178769.3A CN202211178769A CN115639450A CN 115639450 A CN115639450 A CN 115639450A CN 202211178769 A CN202211178769 A CN 202211178769A CN 115639450 A CN115639450 A CN 115639450A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The invention discloses an online monitoring method of an MMC flexible direct current converter valve IGBT health state monitoring system, and relates to the technical field of flexible direct current power transmission. Most of the existing MMC flexible direct current converter valve IGBT monitoring systems carry out IGBT health state through characteristic parameters such as turn-off voltage and current resistance, junction temperature and the like and through an expert diagnosis system, and the calculation and the training of the expert diagnosis system are relatively more and more complex. According to the method, the turn-off time is calculated according to the voltage at two ends of the IGBT, the current flowing through the IGBT and the voltage of the gate pole of the IGBT, and the judgment of the health state is carried out through an expert diagnosis system. By selecting the IGBT turn-off delay time as the characterization quantity of the IGBT health state, the calculation quantity and the learning training quantity of an expert diagnosis system are reduced, and diagnosis of the MMC flexible direct-conversion IGBT health state can be effectively simplified.
Description
Technical Field
The invention relates to the technical field of flexible direct current transmission, in particular to an online monitoring method of an MMC flexible direct current converter valve IGBT health state monitoring system.
Background
At present, in the operation process of a flexible direct-current transmission project based on an MMC, each bridge arm is usually formed by connecting hundreds of sub-modules in series. The MMC flexible direct-current transmission converter valve has a large number of IGBTs, and the IGBTs are used as core devices of the converter valve, so that the health state of the converter valve is related to the normal operation of the converter valve. The IGBT health state characterization quantity is numerous, and many characteristic quantities cannot effectively judge the IGBT health state. Most of the existing monitoring systems carry out IGBT health state by shutting off the characterization parameters such as voltage, current and resistance, junction temperature and the like and through an expert diagnosis system, and the training of calculation and the expert diagnosis system is relatively more and more complicated.
Disclosure of Invention
The invention aims to solve the technical problems and provide the technical task of perfecting and improving the prior technical scheme, providing an online monitoring method of the MMC flexible direct current converter valve IGBT health state monitoring system and aiming at simplifying diagnosis of the MMC flexible direct current converter valve IGBT health state. Therefore, the invention adopts the following technical scheme.
The utility model provides an online monitoring method of flexible direct current converter valve IGBT health status monitoring system of MMC, monitoring system include valve accuse system, submodule piece controller and MMC converter valve submodule piece, the submodule piece includes power, electric capacity, discharge resistance, IGBT and driver that corresponds, the IGBT driver is equipped with the circuit that detects IGBT both ends voltage, flows through IGBT current and IGBT gate pole voltage, submodule piece controller links together valve accuse system and IGBT driver, contain the expert diagnostic system through training in the valve accuse system, the online monitoring method includes the following step:
1) The sub-module controller receives an instruction of the valve control system and simultaneously issues the received instruction to the IGBT driver;
2) After receiving an IGBT turn-off instruction, a driver starts to acquire current Icmax flowing through the IGBT, and acquires IGBT gate voltage Vge, current Ic flowing through the IGBT and voltage Vce at two ends of the IGBT after the IGBT is turned off in real time in the turn-off process;
3) The IGBT driver calculates the turn-off delay time Tdoff of the IGBT;
4) The IGBT driver uploads Tdoff, vce and Icmax to the sub-module controller, and the sub-module controller uploads the Tdoff, vce and Icmax to the valve control system;
5) The method comprises the steps that a valve control system receives Tdoff, vce and Icmax information of all IGBTs of an MMC converter valve;
6) And the valve control system uploads Tdoff, vce and Icmax related to the IGBT according to a database matching module in the expert diagnosis system to judge the health state of the IGBT. According to the method, the IGBT turn-off delay time is selected as the characterization quantity of the IGBT health state, the calculated quantity and the learning training quantity of an expert diagnosis system are reduced, and diagnosis of the MMC flexible direct-current conversion IGBT health state can be effectively simplified.
As a preferable technical means: in the step 3), the turn-off delay time Tdoff of the IGBT is calculated by reducing the gate voltage Vge to 90% of the rated value until Ic is reduced to 90% of Icmax. And calculating the turn-off delay time Tdoff of the IGBT.
As a preferable technical means: the expert diagnosis system of the valve control system comprises turn-off delay time data of the IGBT under different current and voltage conditions, and the expert diagnosis system is subjected to deep learning and autonomous training. Diagnosis and judgment can be accurately realized through built-in data and deep learning training.
As a preferable technical means: and training an expert diagnosis system of the valve control system according to a turn-off mechanism and a fatigue mechanism of the IGBT and the imported test data, wherein the fatigue mechanism is that the longer the turn-off delay of the IGBT is, the more the IGBT is fatigued under the same condition. And the more accurate diagnosis and judgment can be realized according to the pertinence training of the turn-off mechanism and the fatigue mechanism of the IGBT.
Has the beneficial effects that: according to the method, the IGBT turn-off delay time is selected as the representation quantity of the IGBT health state, and the targeted deep learning training is carried out according to the turn-off mechanism and the fatigue mechanism of the IGBT, so that the calculation quantity and the learning training quantity of an expert diagnosis system are reduced, and the diagnosis of the MMC flexible direct conversion IGBT health state can be effectively simplified.
Drawings
Fig. 1 is a schematic view of a monitoring system.
FIG. 2 is a schematic flow diagram of the present invention.
Fig. 3 is a schematic diagram of an IGBT turn-off process.
FIG. 4 is a schematic diagram of a half-bridge submodule of an MMC flexible direct-current power transmission converter valve.
FIG. 5 is a schematic diagram of a full-bridge submodule of an MMC flexible direct-current power transmission converter valve.
Detailed Description
The technical scheme of the invention is further explained in detail by combining the drawings in the specification.
As shown in fig. 1, the MMC flexible dc converter valve IGBT health status monitoring system includes a valve control system, a sub-module controller SCE and an MMC converter valve sub-module, where the MMC converter valve sub-module includes a power DY, a capacitor C, a discharging resistor R, IGBTS, an IGBTs2 and a driver corresponding thereto, the IGBT driver is provided with a circuit for detecting voltages at two ends of the IGBT, a current flowing through the IGBT, and a gate voltage of the IGBT, the sub-module controller connects the valve control system and the IGBT driver together, and the valve control system includes a trained expert diagnostic system therein, as shown in fig. 2, the online monitoring method includes the following steps:
s1) a sub-module controller receives an instruction of a valve control system and simultaneously issues the received instruction to an IGBT driver;
s2) after receiving an IGBT turn-off instruction, the driver starts to collect current Icmax flowing through the IGBT, collects IGBT gate voltage Vge and current Ic flowing through the IGBT in real time in the turn-off process, and voltage Vce at two ends of the IGBT after the IGBT is turned off, wherein the turn-off process of the IGBT is shown in FIG. 3;
s3) the IGBT driver calculates the turn-off delay time Tdoff of the IGBT;
s4) the IGBT driver uploads Tdoff, vce and Icmax to the sub-module controller, and the sub-module controller uploads the Tdoff, vce and Icmax to the valve control system;
s5) the valve control system receives Tdoff, vce and Icmax information of all IGBTs of the MMC converter valve;
and S6) the valve control system uploads Tdoff, vce and Icmax related to the IGBT according to a database matching module in the expert diagnosis system to judge the health state of the IGBT.
In order to realize the calculation of the turn-off delay time Tdoff of the IGBT, in the step S3), the turn-off delay time Tdoff of the IGBT is calculated by reducing the gate voltage Vge from 90% of the rated value to Ic to 90% of Icmax. And calculating the turn-off delay time Tdoff of the IGBT.
In order to accurately realize diagnosis and judgment, the expert diagnosis system of the valve control system comprises turn-off delay time data of the IGBT under different current and voltage conditions, and the expert diagnosis system is subjected to deep learning and autonomous training. Diagnosis and judgment can be accurately realized through built-in data and deep learning training.
In order to realize more accurate diagnosis and judgment, an expert diagnosis system of the valve control system trains according to a turn-off mechanism and a fatigue mechanism of the IGBT and imported test data, wherein the fatigue mechanism is that the longer the turn-off delay of the IGBT is, the more the IGBT is fatigued under the same condition. And the more accurate diagnosis and judgment can be realized according to the pertinence training of the turn-off mechanism and the fatigue mechanism of the IGBT.
According to the method, the IGBT turn-off delay time is selected as the characterization quantity of the IGBT health state, the calculated quantity and the learning training quantity of an expert diagnosis system are reduced, and diagnosis of the MMC flexible direct-current conversion IGBT health state can be effectively simplified.
The corresponding sub-modules are not limited to the half-bridge sub-module shown in fig. 4 and the full-bridge sub-module shown in fig. 5, but are also applicable to other various rectifier modules and corresponding modified structures in the prior art.
The online monitoring method of the system for monitoring the health state of the IGBT of the MMC flexible direct current converter valve shown in fig. 1-5 is a specific embodiment of the present invention, has shown the outstanding substantive features and significant progress of the present invention, and can modify the same in shape, structure and the like according to the practical use requirements and the teaching of the present invention, which are all within the protection scope of the present scheme.
Claims (4)
- An online monitoring method of an MMC flexible direct current converter valve IGBT health state monitoring system is characterized in that the online monitoring method comprises the following steps:1) The sub-module controller receives an instruction of the valve control system and simultaneously issues the received instruction to the IGBT driver;2) After receiving an IGBT turn-off instruction, a driver starts to acquire current Icmax flowing through the IGBT, and acquires IGBT gate voltage Vge, current Ic flowing through the IGBT and voltage Vce at two ends of the IGBT after the IGBT is turned off in real time in the turn-off process;3) The IGBT driver calculates the turn-off delay time Tdoff of the IGBT;4) The IGBT driver uploads Tdoff, vce and Icmax to the sub-module controller, and the sub-module controller uploads the Tdoff, vce and Icmax to the valve control system;5) The method comprises the steps that a valve control system receives Tdoff, vce and Icmax information of all IGBTs of an MMC converter valve;6) And the valve control system uploads Tdoff, vce and Icmax related to the IGBT according to a database matching module in the expert diagnosis system to judge the health state of the IGBT.
- 2. The online monitoring method of the MMC flexible direct current converter valve IGBT health status monitoring system according to claim 1, characterized in that: in step 3), the turn-off delay time Tdoff of the IGBT is calculated from the gate voltage Vge being 90% of the rated value to Ic being reduced to 90% of Icmax.
- 3. The online monitoring method of the MMC flexible direct current converter valve IGBT health status monitoring system according to claim 2, characterized in that: the expert diagnosis system of the valve control system comprises turn-off delay time data of the IGBT under different current and voltage conditions, and the expert diagnosis system is subjected to deep learning and autonomous training.
- 4. The online monitoring method of the MMC flexible direct current converter valve IGBT health status monitoring system of claim 3, characterized in that: the expert diagnosis system of the valve control system trains according to the turn-off mechanism and fatigue mechanism of the IGBT and the imported test data, wherein the fatigue mechanism is that under the same condition, the longer the turn-off delay of the IGBT is, the more the IGBT is fatigued.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211178769.3A CN115639450A (en) | 2022-09-27 | 2022-09-27 | Online monitoring method of MMC flexible direct current converter valve IGBT health state monitoring system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211178769.3A CN115639450A (en) | 2022-09-27 | 2022-09-27 | Online monitoring method of MMC flexible direct current converter valve IGBT health state monitoring system |
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| CN115639450A true CN115639450A (en) | 2023-01-24 |
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| CN202211178769.3A Pending CN115639450A (en) | 2022-09-27 | 2022-09-27 | Online monitoring method of MMC flexible direct current converter valve IGBT health state monitoring system |
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