CN112782499A

CN112782499A - Multi-information fusion-based converter state evaluation method and device

Info

Publication number: CN112782499A
Application number: CN201911095075.1A
Authority: CN
Inventors: 徐绍龙; 刘永江; 贺冠强; 李华; 陈俊; 王亮; 臧晓斌; 万伟伟; 彭宣霖; 李榆银; 吴书舟; 曾祥浩
Original assignee: Zhuzhou CRRC Times Electric Co Ltd
Current assignee: Zhuzhou CRRC Times Electric Co Ltd
Priority date: 2019-11-11
Filing date: 2019-11-11
Publication date: 2021-05-11
Anticipated expiration: 2039-11-11
Also published as: CN112782499B

Abstract

The invention relates to a state evaluation method and device of a current transformer and a computer readable medium. The method comprises the steps of establishing a performance parameter database of the converter, wherein the performance parameter database comprises historical performance parameter sets collected by at least one functional component of the converter, and multiple groups of performance parameters are stored in each functional component in an associated mode; performing feature extraction on the performance parameters of each functional component in the performance parameter database to obtain a plurality of sets of performance feature parameters for each functional component; based on performance characteristic threshold values corresponding to different performances of each functional component, calibrating multiple groups of performance characteristic parameters of each functional component to determine key performance index values corresponding to each group of performance characteristic parameters; and performing neural network modeling based on the multiple sets of performance characteristic parameters of each functional component and the corresponding key performance index values thereof to obtain a performance evaluation model representing the mapping relationship between the key performance index values and the performance characteristic parameters of each functional component.

Description

Multi-information fusion-based converter state evaluation method and device

Technical Field

The invention relates to a fault early warning technology of a converter, in particular to a state evaluation method of the converter based on multi-information fusion, a state evaluation device of the converter based on multi-information fusion and a computer readable medium.

Background

Safety is a constant theme of rail traffic. With the increase of the number of mileage in rail transit operation and construction and the increasing complexity of rail transit vehicle structures in China, the guarantee of rail transit safety and reliability faces a serious challenge. The traction converter is used as a core component of a train power traction system, and the running safety and reliability of the traction converter are directly related to the driving safety. The abnormal parking of the vehicle caused by the fault of the traction converter not only causes the delay and the scheduling confusion of the vehicle, but also causes the panic of passengers, and causes serious economic loss and bad social influence. Therefore, the service life of the traction converter can be greatly prolonged for state monitoring, fault early warning and health management of the traction converter, the safe and reliable operation of the converter is ensured, safety accidents caused by fault failure and economic loss caused by vehicle delay are avoided, and the traction converter has great engineering significance and economic value.

At present, the fault monitoring of the traction converter in the field of rail transit is still in a fault alarm stage, and fault troubleshooting and maintenance are often required after the fault occurs. The failure alarm mode has higher operation and maintenance cost and lower efficiency, and is very unfavorable for the safe operation of the vehicle.

In order to overcome the defects in the prior art and meet the requirements of products in the field of rail transit on safety and reliability, an efficient fault early warning technology of a converter is urgently needed in the field, the fault early warning technology is used for monitoring the running state of a traction converter in real time, early warning and accurately positioning the fault of the traction converter, the service life of the traction converter is predicted, and therefore the safe running of a vehicle is guaranteed.

Disclosure of Invention

The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.

In order to overcome the defects in the prior art and meet the requirements of products in the field of rail transit on safety and reliability, the invention provides a state evaluation method of a converter based on multi-information fusion, a state evaluation device of the converter based on multi-information fusion and a computer readable medium, which are used for monitoring the running state of a traction converter in real time and predicting the service life of the traction converter, thereby ensuring the safe running of a vehicle.

The state evaluation method of the converter based on multi-information fusion provided by the invention comprises the following steps: establishing a performance parameter database of the converter, wherein the performance parameter database comprises historical performance parameter sets collected by at least one functional component of the converter, and each functional component stores multiple groups of performance parameters in an associated manner; performing feature extraction on the performance parameters of each functional component in the performance parameter database to obtain a plurality of sets of performance feature parameters for each functional component; based on performance characteristic threshold values corresponding to different performances of each functional component, calibrating multiple groups of performance characteristic parameters of each functional component to determine key performance index values corresponding to each group of performance characteristic parameters; and performing neural network modeling based on the plurality of sets of performance characteristic parameters of each functional component and the corresponding key performance index values thereof to obtain a performance evaluation model representing a mapping relationship between the key performance index values and the performance characteristic parameters of each functional component.

Optionally, in the state evaluation method of the converter based on the multi-information fusion provided by the present invention, for each functional component, the performing the neural network modeling includes performing the modeling by using a BP neural network model, where the BP neural network model includes an input layer, a hidden layer, and an output layer, the input layer includes input nodes of a plurality of performance characteristics corresponding to each set of performance characteristic parameters of the functional component, and the output layer includes output nodes of key performance index values of the functional component.

Optionally, in the method for evaluating a state of a converter based on multi-information fusion provided by the present invention, an output of each hidden node in the hidden layer is

x_iIs an input of an input node of the input layer, w_jiAnd theta_jRespectively, a connection weight and a threshold between each hidden node and each input node, i is an index of the input node, j is an index of the hidden node,

the output of each output node in the output layer is

w_kjAnd theta_kRespectively representing the connection weight value and the threshold value between each output node and each hidden node, wherein k is the index of the output node.

Optionally, in the state evaluation method of the current transformer based on the multi-information fusion provided by the present invention, the activation function of the BP neural network is a Sigmoid function.

Optionally, in the method for evaluating a state of a converter based on multi-information fusion provided by the present invention, an output value O of an output node of the output layer_kAnd the desired output value t_kError between

The weight correction function in the backward transfer is

The threshold value modification function is

Wherein eta is 0.01-0.8.

Optionally, in the method for evaluating the state of the converter based on the multi-information fusion, the expected output value includes a key performance index value between 0 and 1.

Optionally, in the method for evaluating a state of a converter based on multi-information fusion provided by the present invention, the method further includes: determining a key performance indicator value for at least one functional component using a set of performance feature parameters obtained based on measured performance parameters of the at least one functional component and the performance evaluation model.

Optionally, in the method for evaluating a state of a converter based on multi-information fusion provided by the present invention, the at least one functional component includes all functional components of the converter, and the method further includes: providing an overall performance representation of the converter based on key performance index values for all functional components.

Optionally, in the method for evaluating a state of a converter based on multi-information fusion provided by the present invention, the method further includes: determining historical data of key performance indicator values of the at least one functional component based on the performance evaluation model of the at least one functional component and the performance parameters obtained by continuous monitoring; performing a curve fitting based on historical data of key performance indicator values for the at least one functional component to obtain a key performance indicator value degradation trend curve for the at least one functional component; and determining the life of the at least one functional component based on the current key performance indicator value of the at least one functional component and the corresponding key performance indicator value degradation trend curve.

Optionally, in the method for evaluating a state of a converter based on multi-information fusion provided by the present invention, the method further includes: determining the shortest life of the at least one functional component as the life of the converter.

Optionally, in the method for evaluating a state of a converter based on multi-information fusion provided by the present invention, the performance parameter includes one or more of the following: fan vibration, fan current, and fan voltage with respect to the fan, module current and IGBT temperature with respect to the IGBT, capacitance temperature and capacitance current with respect to the capacitance, contactor coil voltage and coil current with respect to the contactor, converter inlet and outlet water temperature, inlet and outlet water pressure, and filter screen inlet and outlet air temperature with respect to the heat dissipation system, and transformer temperature and transformer vibration with respect to the transformer. The performance characteristic parameters include one or more of: the method comprises the following steps of designing a fan according to the vibration intensity, the frequency spectrum characteristic, the envelope characteristic, the power factor, the unbalance coefficient, the negative sequence current and the zero sequence current of the fan, designing a current effective value, a current time domain characteristic and a temperature effective value of an IGBT, designing a temperature effective value, a capacitance value and a capacitance ESR value of a capacitor, designing a resistance and a breaking time of a contactor coil of a contactor, designing a temperature effective value, a vibration acceleration effective value and a vibration acceleration frequency spectrum characteristic of a heat dissipation system.

According to another aspect of the present invention, a state evaluation device for a converter based on multi-information fusion is also provided herein.

According to another aspect of the present invention, a computer-readable medium is also provided herein.

The present invention provides the above-described computer-readable medium having stored thereon computer-executable instructions. The computer-executable instructions, when executed by the processor, may implement any one of the above-mentioned methods for evaluating the state of the converter based on multi-information fusion.

Drawings

The above features and advantages of the present disclosure will be better understood upon reading the detailed description of embodiments of the disclosure in conjunction with the following drawings. In the drawings, components are not necessarily drawn to scale, and components having similar relative characteristics or features may have the same or similar reference numerals.

Fig. 1 is a schematic flow chart illustrating a fault warning method for a converter according to an aspect of the present invention.

Fig. 2 shows a modeling diagram of a fault early warning method of a converter according to an embodiment of the present invention.

Fig. 3 is a schematic flow chart illustrating a fault warning method for a converter according to an embodiment of the present invention.

Fig. 4 shows a schematic flow diagram of a method for evaluating the state of a converter according to another aspect of the present invention.

FIG. 5 illustrates a schematic diagram of a wind turbine state estimation model provided according to an embodiment of the invention.

FIG. 6 illustrates a schematic diagram of a power module state estimation model provided in accordance with an embodiment of the present invention.

FIG. 7 illustrates a schematic diagram of a capacitance state estimation model provided in accordance with an embodiment of the invention.

FIG. 8 illustrates a schematic diagram of a contactor state evaluation model provided in accordance with one embodiment of the present invention.

Fig. 9 is a schematic diagram illustrating a state evaluation model of a heat dissipation system according to an embodiment of the invention.

Fig. 10 shows a schematic diagram of a transformer state estimation model provided according to an embodiment of the invention.

FIG. 11 shows a schematic representation of a spider-web assessment system provided in accordance with an embodiment of the present invention.

Fig. 12 is a flowchart illustrating a method for predicting the lifetime of a converter according to an embodiment of the present invention.

Fig. 13 is a schematic structural diagram illustrating a fault warning apparatus of a current transformer according to another aspect of the present invention.

Fig. 14 is a schematic structural diagram illustrating a state evaluation apparatus of a current transformer according to another aspect of the present invention.

Fig. 15 illustrates a state monitoring and fault warning intelligent platform of a converter according to an aspect of the present invention.

Fig. 16 illustrates converter operating state intelligent monitoring and fault warning software in accordance with an aspect of the present invention.

Reference numerals

101-103 converter fault early warning method;

301-306 converter fault early warning method;

401-404 converter state evaluation method;

131 a memory;

132 a processor;

141 a memory;

142 processor.

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure. While the invention will be described in connection with the preferred embodiments, there is no intent to limit its features to those embodiments. On the contrary, the invention is described in connection with the embodiments for the purpose of covering alternatives or modifications that may be extended based on the claims of the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be practiced without these particulars. Moreover, some of the specific details have been left out of the description in order to avoid obscuring or obscuring the focus of the present invention.

Referring to fig. 1, fig. 1 is a schematic flow chart illustrating a fault warning method for a converter according to an aspect of the present invention.

As shown in fig. 1, the fault early warning method for the converter based on multi-information fusion provided by the present invention may include the steps of:

101: and establishing a performance parameter database of the converter.

In some embodiments, the performance parameter database may include a set of performance parameters of a plurality of functional components of the converter collected by the converter when at least one fault occurs. In some embodiments, the functional components of the converter may include all or part of the components of a fan, an IGBT power module, a capacitor, a transformer, a cabinet lug, a heat dissipation system, and a contactor. In some embodiments, the converter fault may include one or more of a fan fault, an IGBT power module fault, a capacitor fault, a transformer fault, a cabinet lug fault, a heat dissipation system fault, a contactor fault. In some embodiments, a set of performance parameters for a feature may include a plurality of functional parameters for the feature. The performance parameters include, but are not limited to, one or more of vibration parameters, current parameters, voltage parameters, temperature parameters, and pressure parameters. In some embodiments, the performance parameter may indicate the performance of the corresponding functional component by a particular value.

In practice, the parameters in the performance parameter database may come from historical data from on-board data centers, data from actual line running tests, and bench test data at the service site. In addition, the parameters in the performance parameter database can be obtained through fault simulation tests, for example, a fault prototype is manufactured artificially aiming at the field fault characteristics of a fan, a capacitor, a contactor and a heat dissipation system, and signal acquisition under the fault is carried out.

Specifically, in some embodiments, the fan fault may further include one or more of a bearing inner race fault, a bearing outer race fault, a bearing ball fault, a bearing cage fault, a fan dynamic balance break fault, a fan open phase fault, a fan inter-turn short circuit fault, a fan phase imbalance fault, a fan ground fault, a fan surge fault. In some embodiments, the IGBT power module faults may further include an IGBT over-temperature fault and/or an IGBT over-current fault. In some embodiments, the capacitor fault may further include a capacitance over-temperature fault and/or a capacitance loss of capacitance fault. In some embodiments, the transformer fault may further include a transformer over-temperature fault and/or a transformer insulation breakdown fault. In some embodiments, the heat removal system failure may further include one or more of a screen plugging failure, a water pump failure, a heat exchanger failure, a water cooled panel failure.

In some embodiments, the fault early warning method for the converter based on the multi-information fusion provided by the invention can be implemented on a fault early warning device for the converter based on the multi-information fusion. The converter fault early warning device can acquire the performance parameters of all functional components by using the sensors arranged on all functional components of the traction converter, so that a performance parameter database of the converter is established according to the performance parameter sets of the functional components. Preferably, the performance parameter set corresponding to each fault can be acquired under different working conditions of the converter. The operating conditions of the converter may include the operating environment and range of the locomotive in which the converter is located.

As shown in fig. 1, in the fault early warning method for the converter based on the multi-information fusion provided by the present invention, the method may further include the steps of:

102: feature extraction is performed on the performance parameter sets in the performance parameter database to obtain a fault feature parameter database.

The fault characteristics refer to characteristics having a certain directivity to the fault of each component of the converter. The fault characteristic parameter is a specific numerical value of the fault characteristic and has a certain correlation with a fault state. In some embodiments, the fault signature may include one or more of a total signature, a spectral signature, and an envelope signature for fan vibration, a power factor for fan current, an imbalance coefficient, a negative sequence current, a zero sequence current, a spectral signature, an envelope signature, and an energy signature, a temperature effective value and a temperature variation gradient for transformer temperature, a current effective value and a current time domain signature for module current, a harmonic signature for converter intermediate voltage, a temperature effective value and a temperature variation gradient for IGBT temperature, a total signature and a spectral signature for capacitive current, a temperature effective value and a temperature variation gradient for converter inlet and outlet water temperature, a water pressure effective value for converter inlet and outlet water pressure, a temperature effective value for filter screen inlet and outlet air temperature.

The feature extraction can be implemented through multiple iterative verifications of fault prototype and line operation fault feature data. The feature extraction of the performance parameter set in the performance parameter database may be specifically implemented by using a mature and reliable feature extraction algorithm in the industry in combination with the fault characteristic of the traction converter, and is not described herein again.

In some embodiments, the fault signature parameter database may include at least one fault and at least one set of fault signature parameters corresponding to each fault. In some embodiments, each fault signature parameter set may include a plurality of fault signature parameters for a plurality of functional components of the converter. As shown in fig. 1, in the fault early warning method for the converter based on the multi-information fusion provided by the present invention, the method may further include the steps of:

103: and performing neural network modeling to obtain a fault early warning model representing the mapping relation between the faults and the fault characteristic parameters based on at least one fault in the fault characteristic parameter database and at least one fault characteristic parameter group corresponding to each fault.

In some embodiments, the fault pre-warning device based on the multi-information fusion converter can perform neural network modeling based on the fault state of at least one fault in the fault characteristic parameter database and at least one fault characteristic parameter group corresponding to each fault state. The fault status may include a fault type and a fault level corresponding to each fault type. In some embodiments, the failure degree of the failure corresponding to each failure feature parameter set may be determined by calibrating the failure feature parameters in the failure feature parameter database using one or more failure feature thresholds. Each fault signature threshold may correspond to a critical point between two fault levels for a fault. The failure feature threshold value may be an individual threshold value corresponding to only one failure feature, or may be a combined threshold value corresponding to a combination of one failure feature.

In some embodiments, the plurality of fault signature thresholds for each degree of fault for each type of fault may be determined by fault experimentation and/or expert experience for each type of corresponding fault.

Referring to fig. 2, fig. 2 is a schematic modeling diagram illustrating a fault warning method for a converter according to an embodiment of the present invention.

As shown in fig. 2, in some embodiments, performing neural network modeling as described above may include performing modeling using a BP neural network model. The BP neural network model may include an input layer, a hidden layer, and an output layer.

Specifically, the input layer may include input nodes for a plurality of fault characteristics corresponding to a plurality of fault characteristic parameters in each fault characteristic parameter group. In some embodiments, the input layer is further divided into a signal layer and a feature layer. The signal layer is an original signal obtained by measuring by a sensor and can comprise fan vibration current and voltage, transformer temperature, module current, converter intermediate voltage, IGBT (insulated gate bipolar translator) temperature, capacitance current and temperature, converter inlet and outlet water pressure and filter screen inlet and outlet air temperature. The characteristic layer is a characteristic parameter obtained by performing characteristic extraction and characteristic operation on each signal, and can comprise a total value, a frequency spectrum and an envelope characteristic of fan vibration, a fan power factor, a three-phase imbalance coefficient, a negative sequence current, a zero sequence current, a frequency spectrum characteristic, an envelope characteristic and an energy characteristic, a transformer temperature effective value and a temperature change gradient, a module current effective value and a time domain characteristic, a harmonic characteristic of intermediate voltage, an IGBT temperature effective value and a temperature change gradient, a capacitor temperature effective value and a temperature change gradient, a total value characteristic and a frequency spectrum characteristic of a capacitor current device, an inlet and outlet water temperature effective value and a temperature change gradient, an inlet and outlet water pressure effective value, an inlet and outlet air temperature effective value and a temperature change gradient. In some embodiments, the sample parameters of the input layer may be obtained by fault simulation testing and line actual testing.

The hidden layer may include a plurality of hidden nodes. In some embodiments, the number of layers of the hidden layer may be one. The number of hidden nodes of the hidden layer may be determined according to the number of input nodes of the input layer and the number of output nodes of the output layer. In some embodiments, the number of implicit nodes may be taken as the sum of the number of nodes in the input layer and the output layer. In some embodiments, the output of each hidden node in the hidden layer may be

x_iIs an input of an input node of the input layer, w_jiAnd theta_jRespectively representing the connection weight value and the threshold value between each hidden node and each input node, wherein i is the index of the input node, and j is the index of the hidden node.

The output layer may include at least one fault condition output node. In some embodiments, the output layer may be an output of the corresponding fault diagnosis result. In some embodiments, the output layer may include one or more of a fan bearing inner race fault, an outer race fault, a rolling element fault, a cage fault, a fan dynamic balance failure, a fan open phase fault, a turn-to-turn short circuit fault, a phase imbalance fault, a ground fault, a surge fault, a capacitance over temperature fault, a capacitance loss fault, an IGBT over temperature fault, an over current fault, a filter screen plugging fault, a water pump fault, a heat exchanger fault, a water cooling plate fault, a transformer over temperature fault, an insulation faultAnd (4) a plurality of. In some embodiments, the output of each output node in the output layer may be

w_kjAnd theta_kRespectively representing the connection weight value and the threshold value between each output node and each hidden node, k representing the index of the output node, and f representing the transfer function.

In some embodiments, the activation function of the BP neural network is a Sigmoid function, i.e., a function that can be used to activate the BP neural network

The parameter β may be determined based on characteristics of the neural network model.

In some embodiments, the output value O of the output node of the output layer_kAnd the desired output value t_kMay be an error of

In some embodiments, the weight modification function in the backward pass may be

In some embodiments, the threshold modification function may be

Wherein eta may be 0.01-0.8.

In some embodiments, the desired output value t is_kA fault number indicating a fault condition may be included. As shown in fig. 2, the fault early warning apparatus based on the multi-information fusion converter may use binary coding to number the fault state. In some embodiments, the fault level of a fault condition may be described by a two bit binary code, where 00 may represent a good condition, 01 may represent a mild fault, 10 may represent a moderate fault, and 11 may represent a severe fault.

Referring to fig. 3, fig. 3 is a schematic flowchart illustrating a fault warning method for a converter according to an embodiment of the present invention.

As shown in fig. 3, in an embodiment of the present invention, after obtaining a fault early warning model representing a mapping relationship between a fault and a fault characteristic parameter, the fault early warning method for a converter based on multi-information fusion may further include the steps of:

304: acquiring actually measured performance parameters of a plurality of functional components of the converter;

305: calculating fault characteristic parameters based on the measured performance parameters; and

306: and determining the fault of the converter based on the fault characteristic parameters and the fault early warning model.

In some embodiments, the converter fault early warning device may use sensors disposed in each functional component of the traction converter to acquire measured performance parameters of each functional component. The measured performance parameter may indicate the performance of the corresponding functional component under the current operating condition. The operating conditions of the converter may include the operating environment and range of the locomotive in which the converter is located.

In some embodiments, the converter fault early warning device may perform feature extraction on the obtained measured performance parameter set to calculate a corresponding fault feature parameter. The fault condition of the converter can be automatically determined by further inputting the calculated fault characteristic parameters into the hidden layer of the fault early warning model, and a fault diagnosis result is output through the output layer of the fault early warning model.

In some embodiments, the converter fault early warning device may output a fault early warning to prompt maintenance personnel to repair the converter in time in response to determining that a fault condition exists in the converter. In some embodiments, the converter fault early warning device may further output a corresponding fault early warning to prompt a maintenance person to repair a corresponding functional component in time according to the fault condition determined to exist in the converter.

According to another aspect of the invention, a state evaluation method of the converter based on multi-information fusion is further provided. In some embodiments, the state evaluation method for the converter based on the multi-information fusion provided by the present invention may be implemented on a state evaluation device for the converter based on the multi-information fusion.

Referring to fig. 4, fig. 4 is a schematic flow chart illustrating a method for evaluating a state of a converter according to another aspect of the present invention.

As shown in fig. 4, in the method for evaluating a state of a converter based on multi-information fusion provided by the present invention, the method may include the steps of:

401: and establishing a performance parameter database of the converter.

In some embodiments, the performance parameter database may include a historical set of performance parameters collected with respect to at least one functional component of the converter, wherein each functional component may have stored therein multiple sets of performance parameters in association therewith.

In some embodiments, the functional components of the converter may include all or part of the components of a fan, an IGBT power module, a capacitor, a transformer, a cabinet lug, a heat dissipation system, and a contactor. In some embodiments, a set of performance parameters for a feature may include a plurality of functional parameters for the feature. The performance parameters include, but are not limited to, one or more of vibration parameters, current parameters, voltage parameters, temperature parameters, and pressure parameters. In some embodiments, the performance parameter may indicate the performance of the corresponding functional component by a particular value. In some embodiments, the converter state estimator may collect the performance parameters of each functional component of the traction converter using sensors disposed in each functional component, thereby creating a converter performance parameter database based on the performance parameter sets of the plurality of functional components.

In practice, the parameters in the performance parameter database may come from historical data from on-board data centers, data from actual line running tests, and bench test data at the service site. Preferably, these performance parameters are collected under different operating conditions of the converter. The operating conditions of the converter may include the operating environment and range of the locomotive in which the converter is located.

Specifically, in some embodiments, the performance parameters related to the fan may further include a fan vibration parameter, a fan current parameter, and a fan voltage parameter. In some embodiments, the performance parameters for the IGBT power module may further include a module current parameter and an IGBT temperature parameter. In some embodiments, the performance parameters for the capacitor may further include a capacitance temperature parameter and a capacitance current parameter. In some embodiments, the performance parameters for the contactor may further include a contactor coil voltage parameter and a coil current parameter. In some embodiments, the performance parameters related to the heat dissipation system may further include a converter inlet and outlet water temperature parameter, an inlet and outlet water pressure parameter, and a filter screen inlet and outlet air temperature parameter. In some embodiments, the performance parameters relating to the transformer may further include a transformer temperature parameter and a transformer vibration parameter.

As shown in fig. 4, in the method for evaluating a state of a converter based on multi-information fusion provided by the present invention, the method may further include the steps of:

402: feature extraction is performed on the performance parameters of each functional component in the performance parameter database to obtain sets of performance feature parameters for each functional component.

In some embodiments, each set of performance characteristic parameters may include a plurality of performance characteristic parameters for a plurality of functional components of the current transformer. The performance characteristics refer to characteristics having a certain directivity to the performance of each component of the converter. The performance characteristic parameter is a specific numerical value of the performance characteristic and has a correlation with the degree of the performance.

In some embodiments, the performance characteristics corresponding to the performance characteristic parameters may include one or more of vibration intensity, spectral characteristics, envelope characteristics, power factor, imbalance coefficient, negative sequence current, and zero sequence current with respect to the wind turbine. In some embodiments, the performance characteristics corresponding to the performance characteristic parameters may include one or more of a current effective value, a current time domain characteristic, and a temperature effective value for the IGBT power module. In some embodiments, the performance characteristic corresponding to the performance characteristic parameter may include one or more of an effective temperature value, a capacitance value, and an Equivalent Series Resistance (ESR) value for the capacitor. In some embodiments, the performance characteristic corresponding to the performance characteristic parameter may include one or more of a contactor coil resistance and a breaking time with respect to the contactor. In some embodiments, the performance characteristic corresponding to the performance characteristic parameter may include one or more of a temperature significance, a vibration acceleration significance, and a vibration acceleration spectrum characteristic for the heat dissipation system.

The characteristic extraction can be implemented through multiple iteration verification of the converter prototype and the line operation performance characteristic data. The feature extraction of the performance parameter set in the performance parameter database may be specifically implemented by using a mature and reliable feature extraction algorithm in the industry in combination with the performance characteristics of the traction converter, and is not described herein again.

403: and calibrating multiple groups of performance characteristic parameters of each functional component based on the performance characteristic threshold values corresponding to different performances of each functional component so as to determine the key performance index value corresponding to each group of performance characteristic parameters.

In some embodiments, the sets of performance characteristic parameters for each functional component may be calibrated based on performance characteristic thresholds corresponding to different performance of each functional component. Each performance characteristic threshold may correspond to a critical point between two degrees of goodness of a performance. The performance characteristic threshold value may be an individual threshold value corresponding to only one performance characteristic, or may be a combined threshold value corresponding to a combination of performance characteristics.

In some embodiments, the performance characteristic thresholds corresponding to respective degrees of goodness of the respective performances may be determined by performance experiments and/or expert experience of the respective performances. In some embodiments, the calibrated performance characteristic parameter may determine a key performance metric value based on the associated threshold range. The key performance index value can be between 0 and 1 and is used for indicating the quality degree of the corresponding performance.

404: and performing neural network modeling based on the multiple groups of performance characteristic parameters of each functional component and the corresponding key performance index values thereof to obtain a performance evaluation model representing the mapping relation between the key performance index values and the performance characteristic parameters of each functional component.

In some embodiments, performing neural network modeling as described above may include performing modeling using a BP neural network model. The BP neural network model may include an input layer, a hidden layer, and an output layer. The input layer may include input nodes corresponding to a plurality of performance characteristics corresponding to each set of performance characteristic parameters of the functional component. The hidden layer may include a plurality of hidden nodes. The output layer may include output nodes corresponding to key performance indicator values for the functional component.

Referring to fig. 5, fig. 5 is a schematic diagram illustrating a fan state estimation model according to an embodiment of the invention.

As shown in fig. 5, in some embodiments, the input layer is further divided into a signal layer and a feature layer. The signal layer is a raw signal measured by the sensor and can comprise a fan vibration parameter, a fan current parameter and a fan voltage parameter. The characteristic layer is a characteristic parameter obtained by performing characteristic extraction and characteristic operation on each signal, and can comprise a vibration intensity characteristic, a frequency spectrum characteristic and an envelope characteristic corresponding to a fan vibration parameter; a power factor characteristic, a three-phase imbalance coefficient characteristic, a negative sequence current characteristic, and a zero sequence current characteristic corresponding to the fan current parameter and the fan voltage parameter may be included. In some embodiments, the sample parameters of the input layer may be obtained through performance simulation tests and actual testing of the lines.

Referring to fig. 6, fig. 6 is a schematic diagram illustrating a power module state estimation model according to an embodiment of the invention.

As shown in fig. 6, in some embodiments, the signal layer may include module current parameters and IGBT temperature parameters. The feature layer may include current effective value features and current time domain features corresponding to the module current parameters; and a temperature effective value characteristic corresponding to the IGBT temperature parameter.

Referring to fig. 7, fig. 7 is a schematic diagram illustrating a capacitance state estimation model according to an embodiment of the invention.

As shown in fig. 7, in some embodiments, the signal layer may include a capacitance temperature parameter and a capacitance current parameter. The feature layer may include a temperature-effective value feature corresponding to a temperature parameter of the capacitor; and a capacitance value characteristic and a capacitance ESR value characteristic corresponding to the capacitance current parameter.

Referring to fig. 8, fig. 8 is a schematic diagram illustrating a contactor state evaluation model according to an embodiment of the invention.

As shown in fig. 8, in some embodiments, the signal layer may include a contactor coil voltage parameter and a contactor coil current parameter. The signature layer may include contactor coil resistance signatures corresponding to contactor coil voltage parameters and contactor coil current parameters; and a contactor breaking time characteristic.

Referring to fig. 9, fig. 9 is a schematic diagram illustrating a state evaluation model of a heat dissipation system according to an embodiment of the invention.

As shown in fig. 9, in some embodiments, the signal layer may include a converter inlet and outlet water temperature parameter, a converter inlet and outlet water pressure parameter, and a converter inlet and outlet air temperature parameter. The characteristic layer may include an outlet water temperature exceeding target value magnitude characteristic and an outlet wind temperature exceeding target value magnitude characteristic corresponding to the converter inlet and outlet water temperature parameter, the converter inlet and outlet water pressure parameter and the converter inlet and outlet air temperature parameter.

Referring to fig. 10, fig. 10 is a schematic diagram illustrating a transformer state estimation model according to an embodiment of the invention.

As shown in fig. 10, in some embodiments, the signal layer may include a transformer temperature parameter and a transformer vibration parameter. The characteristic layer can comprise a temperature effective value characteristic corresponding to a temperature parameter of the transformer; and the vibration acceleration effective value characteristic and the vibration acceleration frequency spectrum characteristic corresponding to the vibration parameter of the transformer.

In some embodiments, the number of hidden layers may beOne layer. The number of hidden nodes of the hidden layer may be determined according to the number of input nodes of the input layer and the number of output nodes of the output layer. In some embodiments, the number of implicit nodes may be taken as the sum of the number of nodes in the input layer and the output layer. In some embodiments, the output of each hidden node in the hidden layer may be

In some embodiments, the output layer may be an output corresponding to the state evaluation result. In some embodiments, the output of each output node in the output layer may be

In some embodiments, the threshold modification function may be

Wherein eta may be 0.01-0.8.

In some embodiments, the state evaluation device based on the multi-information fusion converter can perform state evaluation of the converter through a spider web evaluation architecture. The above-mentioned desired output value t_kKey performance index values between 0 and 1 may be included.

Referring to fig. 11, fig. 11 shows a schematic diagram of a spider-web assessment system provided in accordance with an embodiment of the present invention.

As shown in fig. 11, in some embodiments, the spider web evaluation system may display key performance indicator values for the fan, the IGBT, the capacitor, the transformer, the cabinet lifting lug, the heat dissipation system, and the contactor at the same time. In some embodiments, 1.0 may indicate that the corresponding feature performs well; 0.8 may indicate that the corresponding feature performance is slightly degraded; 0.6 may indicate a corresponding functional component performance degradation; 0.4 may indicate a severe degradation of the corresponding functional component performance; 0.2 may indicate critical damage to the corresponding feature; 0.0 may indicate that the corresponding feature is broken.

In an embodiment of the present invention, after obtaining the performance evaluation model representing the mapping relationship between the key performance index value and the performance characteristic parameter, the state evaluation apparatus of the multi-information fusion-based converter may further obtain a performance characteristic parameter set using the measured performance parameter of the at least one functional component, and determine the key performance index value of the at least one functional component based on the obtained performance characteristic parameter set and the performance evaluation model.

In some embodiments, the at least one functional component may be all functional components of the traction converter. In some embodiments, the state estimator of the converter may use sensors located at each functional component of the traction converter to collect measured performance parameters of each functional component. In some embodiments, the state evaluation device of the converter may perform feature extraction on the obtained measured performance parameter set to calculate its corresponding performance feature parameter. The performance characteristic parameters obtained through calculation are further input into the hidden layer of the performance evaluation model, so that the performance states of all functional parts of the converter can be automatically determined, and the state evaluation result is output through the output layer of the performance evaluation model.

Referring to fig. 12, fig. 12 is a flowchart illustrating a method for predicting a lifetime of a converter according to an embodiment of the present invention.

As shown in fig. 12, in an embodiment of the present invention, after obtaining a performance evaluation model representing a mapping relationship between key performance index values and performance characteristic parameters, the method for evaluating a state of a converter based on multi-information fusion may further include the steps of:

1201: determining historical data of key performance index values of the at least one functional component based on the performance evaluation model of the at least one functional component and the performance parameters obtained by continuous monitoring;

1202: performing curve fitting based on the historical data of the key performance indicator values of the at least one functional component to obtain a key performance indicator value degradation trend curve for the at least one functional component; and

1203: determining the life of the at least one functional component based on the current key performance indicator value of the at least one functional component and the corresponding key performance indicator value degradation trend curve.

In some embodiments, the state evaluation device of the converter based on multi-information fusion may continuously monitor the performance parameters of the functional component obtaining the life to be predicted, and determine a plurality of historical data of the corresponding key performance index values according to the performance evaluation model of the functional component. Then, the state evaluation device of the converter based on multi-information fusion can obtain a fitting curve, namely a key performance index value degradation trend curve of the functional component, by using a fitting means that an analytic expression approximates discrete data, and obtain a function expression h (t) of the fitting curve. The functional expression h (t) may indicate a decreasing gradient function of the key performance indicator value of the functional component at time t.

In some embodiments, the remaining life t of the functional component_{Remainder of}Can be obtained by solving the equation

To be determined. In the formula, Δ I is a difference between a current key performance index value of the functional component to be tested and a preset key performance index value threshold. The fitting curve obtained by the fitting and the function expression h (t) thereof can simulate the descending trend of the key performance index value of the functional component to be tested, thereby calculating the trend of the key performance index value of the functional component to be tested later and predicting the residual life t of the functional component to be tested_{Remainder of}. It will be appreciated that the remaining life t of the functional component under test_{Remainder of}The time required for the current key performance index value of the functional component to be tested to fall to the preset key performance index value threshold is defined.

In some embodiments, the state evaluation device of the converter based on multi-information fusion can determine the shortest life of the at least one functional component as the life of the converter.

Based on the above description, the fault early warning method of the converter based on the multi-information fusion and the state evaluation method of the converter based on the multi-information fusion provided by the invention can be used for carrying out feature extraction and feature fusion on the current, voltage, vibration and temperature multidimensional signals of the fan, the capacitor, the IGBT, the contactor, the transformer, the reactor, the heat dissipation system and the lifting lug in the operation process of the converter, and establishing a fault early warning model based on the feature fusion, so that each functional device of the converter is accurately positioned. The fault early warning method based on the converter based on the multi-information fusion can also establish a multi-dimensional state evaluation system of the key materials, systems and structures by fully extracting and mining the existing standards, expert experiences and past data, thereby realizing intelligent monitoring and evaluation of the working state of the converter. According to the fault early warning method of the converter based on multi-information fusion, the key performance indexes and the fault evolution trend of the whole life cycle of the key materials of the converter can be deeply learned, the failure time and the failure mode of the key materials can be predicted according to the current state, the running mileage and the environment of the key materials, and the service life of the key materials of the converter can be predicted.

While, for purposes of simplicity of explanation, the methodologies are shown and described as a series of acts, it is to be understood and appreciated that the methodologies are not limited by the order of acts, as some acts may, in accordance with one or more embodiments, occur in different orders and/or concurrently with other acts from that shown and described herein or not shown and described herein, as would be understood by one skilled in the art.

According to another aspect of the invention, a fault early warning device for a converter based on multi-information fusion is further provided.

Referring to fig. 13, fig. 13 is a schematic structural diagram illustrating a fault warning apparatus of a converter according to another aspect of the present invention.

As shown in fig. 13, the fault pre-warning apparatus for a converter based on multi-information fusion according to the present invention may include a memory 131 and a processor 132. In some embodiments, the processor 132 may be coupled to the memory 131 and configured to implement the fault early warning method of the converter based on multi-information fusion provided in any one of the above embodiments, so as to perform real-time monitoring on the operation state of the traction converter and perform early warning and accurate positioning on the fault of the traction converter.

The present invention provides the above-described computer-readable medium having stored thereon computer-executable instructions. When executed by the processor 132, the computer executable instructions may implement any one of the above-described fault early warning methods for a converter based on multi-information fusion, so as to monitor the operating state of the traction converter in real time, and early warn and accurately locate a fault of the traction converter.

Referring to fig. 14, fig. 14 is a schematic structural diagram illustrating a state evaluation apparatus for a current transformer according to another aspect of the present invention.

As shown in fig. 14, the state evaluation apparatus for a current transformer based on multi-information fusion according to the present invention may include a memory 141 and a processor 142. In some embodiments, the processor 142 may be coupled to the memory 141 and configured to implement the method for estimating the state of the converter based on multi-information fusion provided in any one of the above embodiments, so as to monitor the operation state of the traction converter in real time and predict the service life of the traction converter.

The present invention provides the above-described computer-readable medium having stored thereon computer-executable instructions. The computer executable instructions, when executed by the processor 142, may implement the method for estimating the state of the converter based on multi-information fusion, provided in any of the above embodiments, so as to monitor the operation state of the traction converter in real time and predict the service life of the traction converter.

Although the

processors

132, 142 described in the above embodiments may be implemented by a combination of software and hardware. It is understood that the

processors

132, 142 may be implemented in software or hardware alone. For a hardware implementation, the

processors

132, 142 may be implemented in one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), digital signal processing devices (DAPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), processors, controllers, micro-controllers, microprocessors, other electronic devices designed to perform the functions described herein, or a selected combination thereof. For a software implementation, the

processors

132, 142 may be implemented by separate software modules running on a common chip, such as program modules (programs) and function modules (functions), each of which may perform one or more of the functions and operations described herein.

Based on the above fault early warning, state evaluation and life prediction scheme of multi-information fusion, an intelligent platform for state monitoring and fault early warning of the converter can be developed, as shown in fig. 15. The intelligent platform can mainly comprise a state perception layer, a data acquisition and preprocessing layer and a state evaluation and fault early warning layer.

The state perception layer can be composed of various sensors, realizes perception of fan vibration, current and voltage, support capacitor temperature and current, IGBT temperature, contactor voltage and current, cabinet body lifting lug vibration, transformer vibration and temperature, converter runner temperature, and transmits the perception physical quantity to the acquisition system in the form of analog quantity. The sensor with high reliability and good stability is required to be selected, the measurement frequency range needs to cover the whole fault characteristic frequency, the measurement precision needs to meet the requirement of characteristic extraction, the requirement of using conditions of the converter needs to be met, and the installation needs to be firm and reliable.

The core of the data acquisition and pretreatment layer is used for an analog quantity acquisition A/D acquisition module and a data processing unit for front end edge calculation, so that the acquisition of analog quantities such as current, voltage, vibration, temperature and the like of the state sensing layer can be realized, and meanwhile, the acquisition of intermediate voltage, rotating speed, power, input current of the arrangement module, output current of the inversion module, rotating speed of a fan and contact state of a contactor of the traction system is realized by the communication of optical fibers and the TCU. The method comprises the steps of collecting analog signals transmitted in a state perception layer and a TCU, carrying out segmentation and selection operations on a data structure, carrying out simple Fourier analysis and state characteristic quantity calculation on the operated data, and transmitting the processed data to a state evaluation and fault early warning layer through optical fibers.

The hardware core of the state evaluation and fault early warning layer is a phm (prediction and health management) data processing unit, and the software core is converter working state intelligent monitoring and fault early warning software. The method has the main functions of carrying out feature extraction and state evaluation index calculation on transmitted data, accurately evaluating the running states of a fan, a capacitor, an IGBT (insulated gate bipolar transistor), a contactor, an auxiliary transformer and a heat dissipation system and carrying out fault early warning according to an established state evaluation system and a fault diagnosis model, evaluating and early warning the states of vibration load, dynamic stress and environmental temperature of a converter cabinet body, predicting the service lives of the IGBT, the fan, the capacitor and the contactor, and transmitting state evaluation information and fault early warning information to a vehicle-mounted intelligent center through an Ethernet. Phm the operation performance of the data analysis unit can be selected in configurable mode according to the requirements of operation and storage capacity.

The intelligent converter state monitoring and fault early warning system is characterized in that the working mode is that each key state characteristic is picked up and converted into analog quantity for online transmission through a sensor of a state sensing layer, a data acquisition and preprocessing layer acquires analog signals from the sensing layer, and data is intercepted, screened and front-end operated according to preset rules and modes to be converted into digital signals for transmission to an upper layer. And the state evaluation and fault early warning layer receives the data from the acquisition layer, performs state characteristic index calculation and fault characteristic extraction, performs fault early warning, state evaluation and service life prediction by respectively adopting the existing state evaluation system, the fault model and the service life prediction model, and finally transmits the information to the vehicle-mounted intelligent center and the ground operation and maintenance center to make an intelligent operation and maintenance strategy.

In addition, a set of intelligent monitoring and fault early warning software for the working state of the converter can be developed based on the fault early warning, state evaluation and service life prediction scheme of multi-information fusion. As shown in fig. 16, the software may include a condition monitoring and evaluation module, a logic analysis and diagnosis module, a life prediction module, and a visualization module.

The core of the state monitoring and evaluating module is a state characteristic operation rule and an evaluating system established for the whole body of the converter cabinet body and each key material. Monitoring the vibration, current and voltage of the fan to realize the evaluation of the vibration intensity, power factors and dust deposition degree of the fan; the characteristics of capacitance temperature and current are monitored, the capacitance value, the EST value and the temperature of the capacitor are evaluated, the water temperature of an inversion module, the temperature of the IGBT and the current of the inversion module are monitored, and the junction temperature, the service life and the operating temperature of the IGBT are evaluated; monitoring the current and voltage of the contactor coil to realize the evaluation of the temperature of the contactor coil and the insulation condition of the coil; monitoring the temperature of the transformer, the reactor, the capacitor and the internal cavity, and realizing the evaluation of the environmental temperature of the converter and the running state of the transformer and the reactor; monitoring the vibration of the transformer to realize the evaluation of the vibration of the transformer; and monitoring the vibration of the lifting lugs of the converter, and realizing the evaluation of the load environment of the converter and the dynamic stress of the lifting lugs.

The core of the logic analysis and diagnosis module is a fault diagnosis and early warning model established for the fan, the capacitor, the contactor, the IGBT, the heat dissipation system and the lifting lug of the cabinet body. The method comprises the steps of monitoring fan vibration, realizing fault diagnosis and early warning of bearing and rotor eccentricity and dynamic balance damage, monitoring fan current and voltage, realizing fault diagnosis and early warning of fan phase loss, grounding, stator insulation and turn-to-turn short circuit, and monitoring capacitor temperature, pressure, current and intermediate voltage, and realizing early warning of capacitor over-temperature, overvoltage and excessive reduction of capacitance value. And the current and the voltage of the contactor and a control command are monitored to realize the diagnosis and early warning of the action fault, the coil overtemperature and the discharge fault of the contactor. And the current, the intermediate voltage and the temperature of the water cooling plate of the IGBT are monitored to realize early warning of over-temperature, overcurrent and current abnormity of the IGBT. And monitoring the temperature of each key material and the inner cavity of the converter, the water temperature of the module, the flow, the traction power, the speed and the rotating speed of the fan, and realizing the diagnosis and early warning of the filter screen blockage fault, the water pump fault, the heat exchanger fault and the water cooling plate heat conduction fault. The temperature and the current of the transformer are monitored to realize the overtemperature early warning and the insulation damage early warning of the transformer. The vibration of the lifting lugs of the cabinet body is monitored, and the dynamic load of the lifting lugs is early warned excessively.

The core of the service life prediction module is a service life prediction model aiming at the IGBT, the capacitor, the fan and the contactor. The service lives of the IGBT, the capacitor, the fan and the contactor are predicted by monitoring the IGBT turn-off characteristics, the capacitance value, the fan bearing and coil insulation and the evolution law of contactor coil aging.

The visualization module is mainly used for displaying real-time fault waveforms, an operation state evaluation graph, early warning information and historical process data, and has a good display effect, wherein the operation state evaluation graph is supposed to adopt a normalized spider-web graph.

Those of skill in the art would understand that information, signals, and data may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits (bits), symbols, and chips that may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

Those of skill would further appreciate that the various illustrative logical blocks, modules, circuits, and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

The various illustrative logical modules, and circuits described in connection with the embodiments disclosed herein may be implemented or performed with a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.

The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC. The ASIC may reside in a user terminal. In the alternative, the processor and the storage medium may reside as discrete components in a user terminal.

In one or more exemplary embodiments, the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software as a computer program product, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a computer. By way of example, and not limitation, such computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. Any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a web site, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium. Disk (disk) and disc (disc), as used herein, includes Compact Disc (CD), laser disc, optical disc, Digital Versatile Disc (DVD), floppy disk and blu-ray disc where disks (disks) usually reproduce data magnetically, while discs (discs) reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.

The previous description of the disclosure is provided to enable any person skilled in the art to make or use the disclosure. Various modifications to the disclosure will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other variations without departing from the spirit or scope of the disclosure. Thus, the disclosure is not intended to be limited to the examples and designs described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A state evaluation method of a converter based on multi-information fusion comprises the following steps:

establishing a performance parameter database of the converter, wherein the performance parameter database comprises historical performance parameter sets collected by at least one functional component of the converter, and each functional component stores multiple groups of performance parameters in an associated manner;

performing feature extraction on the performance parameters of each functional component in the performance parameter database to obtain a plurality of sets of performance feature parameters for each functional component;

based on performance characteristic threshold values corresponding to different performances of each functional component, calibrating multiple groups of performance characteristic parameters of each functional component to determine key performance index values corresponding to each group of performance characteristic parameters; and

and performing neural network modeling based on the multiple sets of performance characteristic parameters and the corresponding key performance index values of each functional component to obtain a performance evaluation model representing the mapping relation between the key performance index values and the performance characteristic parameters of each functional component.

2. The state estimation method of claim 1, wherein for each functional unit, the performing neural network modeling comprises performing modeling using a BP neural network model, the BP neural network model comprising an input layer, an implied layer, and an output layer, the input layer comprising input nodes for a plurality of performance characteristics corresponding to each set of performance characteristic parameters of the functional unit, the output layer comprising output nodes for key performance indicator values of the functional unit.

3. The state estimation method of claim 2, wherein the output of each hidden node in the hidden layer is

the output of each output node in the output layer is

4. The state estimation method of claim 3, wherein the activation function of the BP neural network is a Sigmoid function.

5. The state estimation method of claim 3, wherein an output value O of an output node of the output layer_kAnd the desired output value t_kError between

The weight correction function in the backward transfer is

The threshold value modification function is

Wherein eta is 0.01-0.8.

6. The state estimation method of claim 5, wherein the expected output value includes a key performance index value between 0 and 1.

7. The state estimation method of claim 1, further comprising:

determining a key performance indicator value for at least one functional component using a set of performance feature parameters obtained based on measured performance parameters of the at least one functional component and the performance evaluation model.

8. The condition evaluating method as claimed in claim 7, wherein said at least one functional component includes all functional components of said converter, said condition evaluating method further comprising:

providing an overall performance representation of the converter based on key performance index values for all functional components.

9. The state estimation method of claim 1, further comprising:

determining historical data of key performance indicator values of the at least one functional component based on the performance evaluation model of the at least one functional component and the performance parameters obtained by continuous monitoring;

performing a curve fitting based on historical data of key performance indicator values for the at least one functional component to obtain a key performance indicator value degradation trend curve for the at least one functional component; and

determining the lifetime of the at least one functional component based on the current key performance indicator value of the at least one functional component and the corresponding key performance indicator value degradation trend curve.

10. The state estimation method of claim 9, further comprising:

determining the shortest life of the at least one functional component as the life of the converter.

11. The state estimation method of claim 1, wherein the performance parameters include one or more of:

fan vibration, fan current, and fan voltage with respect to the fan, module current and IGBT temperature with respect to the IGBT, capacitor temperature and capacitor current with respect to the capacitor, contactor coil voltage and coil current with respect to the contactor, converter inlet and outlet water temperature, inlet and outlet water pressure, and filter screen inlet and outlet air temperature with respect to the heat dissipation system, and transformer temperature and transformer vibration with respect to the transformer,

the performance characteristic parameters include one or more of:

the method comprises the following steps of designing a fan according to the vibration intensity, the frequency spectrum characteristic, the envelope characteristic, the power factor, the unbalance coefficient, the negative sequence current and the zero sequence current of the fan, designing a current effective value, a current time domain characteristic and a temperature effective value of an IGBT, designing a temperature effective value, a capacitance value and a capacitance ESR value of a capacitor, designing a resistance and a breaking time of a contactor coil of a contactor, designing a temperature effective value, a vibration acceleration effective value and a vibration acceleration frequency spectrum characteristic of a heat dissipation system.

12. A state evaluation device of a converter based on multi-information fusion is characterized by comprising the following components:

a memory; and

a processor configured to:

13. The state estimation device of claim 12, wherein the processor is further configured to:

and for each functional component, performing modeling by using a BP neural network model, wherein the BP neural network model comprises an input layer, a hidden layer and an output layer, the input layer comprises a plurality of input nodes of performance characteristics corresponding to each group of performance characteristic parameters of the functional component, and the output layer comprises output nodes of key performance index values of the functional component.

14. The state estimation apparatus of claim 13, wherein the output of each hidden node in the hidden layer is

the output of each output node in the output layer is

15. The state estimation apparatus of claim 14, wherein the activation function of the BP neural network is a Sigmoid function.

16. The state evaluation apparatus of claim 14, wherein an output value O of an output node of the output layer_kAnd the desired output value t_kError between

The weight correction function in the backward transfer is

The threshold value modification function is

Wherein eta is 0.01-0.8.

17. The state estimation apparatus of claim 16, wherein the expected output value comprises a key performance index value between 0 and 1.

18. The state estimation device of claim 12, wherein the processor is further configured to:

19. The condition evaluating apparatus of claim 18 wherein said at least one functional component includes all functional components of said current transformer, said processor further configured to:

20. The state estimation device of claim 12, wherein the processor is further configured to:

21. The state estimation device of claim 20, wherein the processor is further configured to:

22. The state estimation apparatus of claim 12, wherein the performance parameters include one or more of:

the performance characteristic parameters include one or more of:

23. A computer-readable medium having stored thereon computer-executable instructions that, when executed by a processor, perform the method of any one of claims 1-11.