CN114475255B

CN114475255B - High-voltage on-load self-checking method and system for traction converter of railway vehicle

Info

Publication number: CN114475255B
Application number: CN202210170966.4A
Authority: CN
Inventors: 杨其林; 林显琦; 张佳波; 梁大伟; 尚付磊; 苗存绪
Original assignee: CRRC Qingdao Sifang Rolling Stock Research Institute Co Ltd
Current assignee: CRRC Qingdao Sifang Rolling Stock Research Institute Co Ltd
Priority date: 2022-02-23
Filing date: 2022-02-23
Publication date: 2023-08-08
Anticipated expiration: 2042-02-23
Also published as: CN114475255A

Abstract

The embodiment of the invention relates to a high-voltage on-load self-checking method and a system for a traction converter of a railway vehicle, wherein the method comprises the following steps: receiving first request data; when the test request is made, judging whether the railway vehicle currently meets the self-checking condition or not, and generating first instruction data according to a judging result; identifying the current self-checking state information of the traction converter; identifying the first instruction data when waiting for the self-checking state; judging whether the traction converter currently meets self-checking conditions for the self-checking starting instruction to generate corresponding first state data; identifying the type of the traction converter when the state is satisfied; when the type of the AC power supply traction converter is adopted, carrying out self-checking treatment on the AC power supply traction converter to generate corresponding self-checking report data; when the type of the direct current power supply traction converter is adopted, self-checking treatment of the direct current power supply traction converter is carried out to generate self-checking report data; and sending the self-checking report data back to the driver. By the scheme, the testing accuracy can be improved.

Description

High-voltage on-load self-checking method and system for traction converter of railway vehicle

Technical Field

The invention relates to the technical field of rail transit, in particular to a high-voltage on-load self-checking method and system for a traction converter of a rail vehicle.

Background

The traction converter is an important component of the railway vehicle, and has the main functions of converting electric energy of traction power supply and controlling a traction motor to realize the functions of traction, braking and speed regulation of the vehicle. The traction power supply system of the railway vehicle is mainly divided into alternating current power supply and direct current power supply. The traction converter for alternating current power supply is usually in an alternating current-direct current-alternating current topological structure and consists of a four-quadrant rectifier, a direct current conversion circuit and a traction inverter. The direct current power supply traction converter is generally of an direct current-alternating current topological structure and consists of a direct current conversion circuit and a traction inverter.

It is very important to detect the function and the high-voltage operation state of the main electric devices of the traction converter before the railway vehicle is started (i.e. in the stationary state of the vehicle), so that faults can be found in advance, thereby ensuring the positive line operation state of the vehicle. The existing detection method mainly comprises the step of manually operating and testing by a driver. The manual operation test needs to manually execute operation procedures and manually judge partial test results, so that the problems of accidental misjudgment and incomplete functional test exist.

Disclosure of Invention

The invention aims at overcoming the defects of the prior art, and provides a high-voltage on-load self-checking method and a high-voltage on-load self-checking system for a traction converter of a railway vehicle. By the scheme, dependence on artificial factors can be eliminated during self-inspection of the traction converter; the vehicle-mounted existing device equipment is used for testing, an external detection device is not required to be added, and the testing operation difficulty and the testing cost can be reduced.

In view of this, a first aspect of the embodiments of the present invention provides a high-voltage on-load self-checking method for a traction converter of a railway vehicle, the method includes:

receiving first request data sent by a driver;

when the first request data is a test request, judging whether the railway vehicle currently meets self-checking conditions or not, and generating corresponding first instruction data according to a judging result;

Identifying the current self-checking state information of the traction converter;

when the self-checking state information is in a waiting self-checking state, identifying the first instruction data; if the first instruction data is a self-checking starting instruction, judging whether the traction converter currently meets self-checking conditions or not to generate corresponding first state data;

when the first state data is a satisfied state, identifying the type of the traction converter;

when the type of the traction converter is an alternating current power supply traction converter type, performing alternating current power supply traction converter self-checking processing on the traction converter to generate corresponding self-checking report data;

when the type of the traction converter is a direct current power supply traction converter type, performing direct current power supply traction converter self-checking processing on the traction converter to generate self-checking report data;

and sending the self-checking report data back to a driver.

Preferably, the traction converter takes a traction motor, a braking resistor box and other direct-current side loads connected with the traction converter as working loads; the traction converter comprises a four-quadrant rectifier, a direct current conversion circuit and a traction inverter when the type of the traction converter is an alternating current power supply traction converter type, and comprises the direct current conversion circuit and the traction inverter when the type of the traction converter is a direct current power supply traction converter type;

When the traction converter is of an alternating current power supply traction converter type, the input end of the four-quadrant rectifier is connected with alternating current power supply equipment, and the output end of the four-quadrant rectifier is respectively connected with the input end of the direct current conversion circuit and the input ends of other direct current side loads; when the traction converter is of a direct current power supply traction converter type, the input end of the direct current conversion circuit is connected with direct current power supply equipment;

the output end of the direct current conversion circuit is respectively connected with the input end of the traction inverter and the brake resistor box;

the output end of the traction inverter is connected with the input end of the traction motor;

the four-quadrant rectifier comprises an input current sensor and a plurality of rectifying IGBT devices; the direct current conversion circuit comprises an output chopper current sensor and a plurality of chopper IGBT devices; the traction inverter includes an output three-phase current sensor and a plurality of inverting IGBT devices.

Preferably, the determining whether the rail vehicle currently meets the self-checking condition and generating the corresponding first instruction data according to the determination result specifically includes:

judging whether at least one of all the main circuit breakers of the railway vehicle is closed, if yes, setting a first judging result to be satisfied;

Judging whether the current speed of the railway vehicle is lower than a preset minimum allowable speed V _min If yes, setting a second judging result to be satisfied;

judging whether the traction converter is in a fault isolation state at present or not, if not, setting a third judging result to be satisfied;

judging whether the current direction handle direction of the railway vehicle is in a forward position or a backward position, if so, setting a fourth judging result to be satisfied;

and if the first, second, third and fourth judging results are all met, setting the first instruction data as a self-checking starting instruction.

Preferably, the determining whether the traction converter currently meets the self-checking condition to generate the corresponding first state data specifically includes:

judging whether the current speed of the railway vehicle is lower than a preset minimum allowable speed V _min If yes, setting a fifth judging result to be satisfied;

if the type of the traction converter is the type of the AC power supply traction converter, judging whether the four-quadrant rectifier is in a fault isolation state currently, and if not, setting a sixth judging result to be satisfied;

judging whether the direct current conversion circuit is completely precharged currently or not, if so, setting a seventh judging result to be satisfied;

Judging whether the traction inverter is in a non-fault isolation state at present and the inversion IGBT device is not driven to be enabled, if so, setting an eighth judging result to be satisfied;

if the traction converter is of an alternating current power supply traction converter type, setting the first state data as a satisfied state when the fifth, sixth, seventh and eighth judging results are all satisfied;

and if the type of the traction converter is the type of the direct current power supply traction converter, setting the first state data as a satisfied state when the fifth, seventh and eighth judging results are all satisfied.

Preferably, the performing self-checking processing on the traction converter to generate corresponding self-checking report data specifically includes:

switching the self-checking state information into a traction inverter self-checking state; performing first self-checking processing on the traction inverter to generate corresponding first self-checking result data;

when the first self-checking process is finished, the self-checking state information is switched to a self-checking state of the direct current conversion circuit; performing second self-checking processing on the direct current conversion circuit to generate corresponding second self-checking result data;

When the second self-checking process is finished, the self-checking state information is switched to a four-quadrant rectifier self-checking state; performing third self-checking processing on the four-quadrant rectifier to generate corresponding third self-checking result data;

when the third self-checking process is finished, the self-checking state information is switched to a self-checking finishing state; performing first data integration processing on the first, second and third self-checking result data to generate self-checking report data;

and after the self-checking report data is obtained, switching the self-checking state information back to a waiting self-checking state.

Preferably, the performing self-checking processing on the traction converter by the direct current power supply traction converter to generate the self-checking report data specifically includes:

when the second self-checking processing is finished, the self-checking state information is switched to a self-checking finishing state; and performing second data integration processing on the first self-checking result data and the second self-checking result data to generate self-checking report data;

Further, the performing the first self-checking process on the traction inverter to generate corresponding first self-checking result data specifically includes:

taking the traction motor as a self-checking load;

setting a three-phase current target value I _{s_aim} The method comprises the steps of carrying out a first treatment on the surface of the According to the single-phase equivalent circuit of the traction motor, calculating to obtain an open-loop modulation voltage given value V _{S_cons} And an open-loop modulation frequency setpoint f _{s_cons} ；

According to the three-phase current target value I _{s_aim} And a preset three-phase current error coefficient T _inv Calculating three-phase current minimum value I _{s_min} ＝I _{s_aim} *(1-T _inv ) Maximum value of three-phase current I _{s_max} ＝I _{s_aim} *(1+T _inv ) The method comprises the steps of carrying out a first treatment on the surface of the And take I as _{s_min} Is lower limit, I _{s_max} Establishing a first current range as an upper limit;

controlling the traction motor to be in a rotor locked state by performing air parking braking operation on the railway vehicle in a stationary state; and according to the open-loop modulation voltage set value V _{S_cons} And the open-loop modulation frequency given value f _{s_cons} The modulation control pulse is sent to the inversion IGBT device to control the traction inverter to enter an open loop control mode;

when the continuous working time length of the traction inverter in the open-loop control mode exceeds a first preset time length m ₁ When the feedback information of the output three-phase current sensor is obtained, a corresponding first current I is generated _s The method comprises the steps of carrying out a first treatment on the surface of the The fault information of the inversion IGBT device is acquired, and corresponding first fault data are generated;

when the first current I _s When the first current range is met and the first fault data is empty, setting the first self-checking result data as successful self-checking; when the first current I _s When the first current range is not satisfied or the first fault data is not empty, the first current I _s The first observation current range and the first fault data form the first self-checking result data;

and after the first self-checking result data is obtained, controlling the traction inverter to return to a closed-loop control mode.

Further, the performing a second self-checking process on the dc conversion circuit to generate corresponding second self-checking result data specifically includes:

taking the braking resistor box as a self-checking load; the chopper IGBT device of the direct current conversion circuit is controlled to enter an open loop control mode by sending a control pulse, wherein the duty ratio of the chopper IGBT device is set to be the duty ratio K _cons ；

According to the set duty ratio K _cons And a preset DC conversion circuit input voltage V _dc Resistance value R of brake resistor box _chop Error coefficient T of chopper current _chop Calculating the minimum value I of the chopping current _{chop_min} ＝V _dc *(1-T _chop )*K _cons /R _chop Maximum value of chopper current I _{chop_max} ＝V _dc *(1+T _chop )*K _cons /R _chop The method comprises the steps of carrying out a first treatment on the surface of the And take I as _{chop_min} Is lower limit, I _{chop_max} Establishing a second current range as an upper limit;

when the continuous working time length of the direct current conversion circuit in the open loop control mode exceeds a second preset time length m ₂ When the output chopper current is obtainedThe feedback information of the sensor generates a corresponding second current I _chop The method comprises the steps of carrying out a first treatment on the surface of the Obtaining fault information of the chopping IGBT device to generate corresponding second fault data;

when the second current I _chop Setting the second self-checking result data as the success of self-checking when the second current range is met and the second fault data is empty; when the second current I _chop When the second current range is not satisfied or the second fault data is not empty, the second current I _chop The second current range and the second fault data form second self-checking result data;

and after the second self-checking result data is obtained, controlling the direct current conversion circuit to return to a closed-loop control mode.

Further, the performing a third self-checking process on the four-quadrant rectifier to generate corresponding third self-checking result data specifically includes:

Taking the braking resistor box and the other direct-current side loads as self-checking loads; the four-quadrant rectifier is controlled to be in a closed-loop control mode by sending control pulse to the rectifying IGBT device of the four-quadrant rectifier, so that the four-quadrant rectifier works in a loaded state; and the direct current conversion circuit is controlled to enter an open loop control mode by sending control pulse to the chopping IGBT device of the direct current conversion circuit, and the duty ratio of the direct current conversion circuit is set to be the duty ratio K _cons ；

Constructing a third current range; the lower limit of the third current range is the minimum value I of the four-quadrant input current _{4QC_min} The upper limit is the maximum value I of the four-quadrant input current _{4QC_max} ，

I _{4QC_min} ＝P _chop /(N _4QC *V _AC )，

I _{4QC_max} ＝(P _chop +P _{Aux_max} )/(N _4QC *V _AC ),

P _chop For the power consumption of the DC conversion circuit, P _{Aux_max} For the maximum power of the other DC side load, N _4QC For the number of parallel rectifying modules of the four-quadrant rectifier, V _AC An input power supply voltage for the four-quadrant rectifier;

when the continuous working time of the direct current conversion circuit in the open loop control mode exceeds a third preset time m ₃ When the feedback information of the input current sensor is acquired to generate a corresponding third current I _4QC The method comprises the steps of carrying out a first treatment on the surface of the Obtaining fault information of the rectifying IGBT device to generate corresponding third fault data;

When the third current I _4QC Setting the third self-checking result data as the success of self-checking when the third current range is met and the third fault data is empty; when the third current I _4QC When the third current range is not satisfied or the third fault data is not empty, the third current I _4QC The third current range and the third fault data form the third self-checking result data;

and after the third self-checking result data is obtained, the four-quadrant rectifier is controlled to maintain a closed-loop control mode, and the direct current conversion circuit returns to the closed-loop control mode.

A second aspect of the embodiment of the present invention provides a system for implementing the high-voltage on-load self-checking method of a traction converter of a railway vehicle provided in the first aspect, where the system includes: the system comprises a man-machine interface unit, a traction control unit, a traction converter and a load equipment group;

the man-machine interface unit comprises a driver operation panel and a communication interface; the driver operation panel is connected with the communication interface; the communication interface is connected with the traction control unit; the driver operation panel is used for receiving first request data sent by a driver; when the first request data is a test request, judging whether the railway vehicle currently meets self-checking conditions or not, and generating corresponding first instruction data according to a judging result; and transmitting the first instruction data to the traction control unit through the communication interface; and receiving self-test report data returned from the traction control unit and returning the self-test report data to a driver;

The traction control unit is connected with the traction converter; the traction control unit is used for identifying the current self-checking state information of the traction converter; when the self-checking state information is in a waiting self-checking state, the first instruction data are identified; if the first instruction data is a self-checking starting instruction, judging whether the traction converter currently meets self-checking conditions or not to generate corresponding first state data; when the first state data is in a satisfied state, the type of the traction converter is identified; when the type of the traction converter is an alternating current power supply traction converter type, performing alternating current power supply traction converter self-checking processing on the traction converter to generate self-checking report data; when the type of the traction converter is a direct current power supply traction converter type, performing direct current power supply traction converter self-checking processing on the traction converter to generate self-checking report data; and sending the self-checking report data back to the man-machine interface unit;

the traction converter is connected with the load equipment group; the traction converter comprises a four-quadrant rectifier, a direct current conversion circuit and a traction inverter when the type of the traction converter is an alternating current power supply traction converter type, and comprises the direct current conversion circuit and the traction inverter when the type of the traction converter is a direct current power supply traction converter type;

When the traction converter is of an alternating current power supply traction converter type, the input end of the four-quadrant rectifier is connected with alternating current power supply equipment, and the output end of the four-quadrant rectifier is respectively connected with the input end of the direct current conversion circuit and the input ends of other direct current side loads of the load equipment group; the four-quadrant rectifier comprises an input current sensor and a plurality of rectifying IGBT devices; the input current sensor is used for collecting input current of the four-quadrant rectifier and feeding back collected information to the traction control unit; the rectification IGBT device is used for receiving the control pulse sent from the traction control unit and adjusting the four-quadrant rectifier to enter an open-loop or closed-loop control mode according to the control pulse;

the input end of the direct current conversion circuit is connected with direct current power supply equipment when the type of the traction converter is a direct current power supply traction converter type; the output end of the direct current conversion circuit is respectively connected with the input end of the traction inverter and the braking resistor box of the load equipment group; the direct current conversion circuit comprises an output chopper current sensor and a plurality of chopper IGBT devices; the output chopper current sensor is used for collecting the output chopper current of the direct current conversion circuit and feeding back collected information to the traction control unit; the chopping IGBT device is used for receiving the control pulse sent from the traction control unit and adjusting the direct current conversion circuit according to the control pulse to realize an open-loop or closed-loop control mode;

The output end of the traction inverter is connected with the input end of the traction motor of the load equipment group; the traction inverter comprises an output three-phase current sensor and a plurality of inversion IGBT devices; the output three-phase current sensor is used for collecting output three-phase current of the traction inverter and feeding back collected information to the traction control unit; the inversion IGBT device is used for receiving the control pulse sent from the traction control unit and adjusting the traction inverter to realize an open-loop or closed-loop control mode according to the control pulse;

the load device group includes the other direct current side load, the braking resistor box, and the traction motor.

According to the high-voltage on-load self-checking method and system for the traction converter of the railway vehicle, provided by the embodiment of the invention, through the scheme, the main electric devices of the traction converter can be automatically tested before the railway vehicle is sent out, so that dependence on artificial factors is eliminated; the vehicle-mounted existing device equipment is used for testing, an external detection device is not required to be added, the testing operation difficulty and the testing cost are reduced, and the testing efficiency is improved.

Drawings

Fig. 1 is a schematic diagram of a high-voltage on-load self-checking method of a traction converter of a railway vehicle according to an embodiment of the present invention;

Fig. 2 is a schematic block diagram of an ac power traction converter according to a first embodiment of the present invention;

fig. 3 is a schematic block diagram of a dc power traction converter according to a first embodiment of the present invention;

fig. 4 is a schematic diagram of a single-phase equivalent circuit of a traction motor according to a first embodiment of the present invention;

fig. 5 is a schematic structural diagram of a high-voltage on-load self-checking system of a traction converter of a rail vehicle according to a second embodiment of the present invention.

Detailed Description

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.

Fig. 1 is a schematic diagram of a high-voltage on-load self-checking method of a traction converter of a railway vehicle according to an embodiment of the present invention, as shown in fig. 1, the method includes the following steps:

and step 1, receiving first request data sent by a driver.

Here, the embodiment of the invention provides a driver operation panel for a driver, and the panel acquires the input information of the driver as first request data through an input device such as a connection instruction button, a keyboard, a mouse or a touch screen; the panel can be a stand-alone operation panel or can be integrated on a driver total operation panel.

The traction converter to be tested according to an embodiment of the present invention will be briefly described before further explanation of the subsequent steps. On a railway vehicle, a traction converter is connected with power supply equipment of the railway vehicle, and other externally applied voltage devices are not used for supplying power to the railway vehicle when the railway vehicle is subjected to self-inspection. On a railway vehicle, a load equipment set connected with a traction converter comprises a traction motor, a braking resistance box and other direct current side loads, and when the self-checking device is used for self-checking, other additional load devices are not used as test load equipment of the traction converter, and the traction motor, the braking resistance box and other direct current side loads of the railway vehicle load equipment set are directly used as test loads.

When the type of the traction converter is an alternating current power supply traction converter type, the traction converter comprises a four-quadrant rectifier, a direct current conversion circuit and a traction inverter, as shown in a schematic diagram of a module of the alternating current power supply traction converter provided in fig. 2; when the type is a direct current power supply traction converter type, the direct current power supply traction converter comprises a direct current conversion circuit and a traction inverter, and as shown in a schematic diagram of a module of the direct current power supply traction converter provided by the first embodiment of the invention in fig. 3. The four-quadrant rectifier comprises an input current sensor and a plurality of rectification IGBT devices; the direct current conversion circuit comprises an output chopper current sensor and a plurality of chopper IGBT devices; the traction inverter includes an output three-phase current sensor and a plurality of inverter IGBT devices.

When the traction converter is of an alternating current power supply traction converter type, the input end of the four-quadrant rectifier is connected with alternating current power supply equipment, and the output end of the four-quadrant rectifier is respectively connected with the input end of the direct current conversion circuit and the input ends of other direct current side loads; the output end of the direct current conversion circuit is respectively connected with the input end of the traction inverter and the brake resistor box; the output end of the traction inverter is connected with the input end of the traction motor; as shown in fig. 2.

When the traction converter is of a direct current power supply traction converter type, the input end of the direct current conversion circuit is connected with direct current power supply equipment; the output end of the direct current conversion circuit is respectively connected with the input end of the traction inverter and the brake resistor box; the output end of the traction inverter is connected with the input end of the traction motor; as shown in fig. 3.

Step 2, when the first request data is a test request, judging whether the railway vehicle currently meets the self-checking condition or not, and generating corresponding first instruction data according to a judging result;

when the first request data is a test request, the driver initiates a self-test application to the traction converter, whether the current state of the railway vehicle meets the self-test condition of the traction converter or not is required to be judged in advance before the self-test is carried out, and if so, first instruction data which are specific to a self-test starting instruction are generated;

The method specifically comprises the following steps: step 21, judging whether at least one of all main circuit breakers of the railway vehicle is closed, if yes, setting a first judging result to be satisfied;

here, if no main breaker is closed, the rail vehicle has no power source, and the high-voltage load test of the traction converter cannot be realized; so at least one main breaker must be closed to meet the self-test requirement;

step 22, judging whether the current speed of the railway vehicle is lower than the preset minimum allowable speed V _min If yes, setting a second judging result to be satisfied;

here, the minimum allowable speed V _min Is a preset minimum speed value, is lower than the minimum allowable speed V _min The rail vehicle is considered to be stationary; from the foregoing, the self-test of the traction converter is performed before the vehicle runs, so the vehicle must be in a stationary state to meet the self-test requirement;

step 23, judging whether the traction converter is in a fault isolation state at present, if not, setting a third judging result to be satisfied;

here, once the traction converter in the embodiment of the invention has faults, the corresponding fault isolation information is stored in an isolated state, the fault isolation information cannot be deactivated until the corresponding faults are solved, and if the fault isolation information in a non-deactivated state can be obtained in the current step, the traction converter is in the fault isolation state currently and does not meet the self-test requirement; otherwise, if any fault isolation information in a non-deactivated state cannot be obtained, the traction converter is not in the fault isolation state at present, and the self-test requirement is met;

Step 24, judging whether the handle direction of the current direction of the railway vehicle is in a forward position or a backward position, if so, setting a fourth judging result to be satisfied;

here, the test of the traction converter in the embodiment of the invention is a load test, and the load connection of the traction converter is completed through a direction handle; the handle position of the direction handle can be connected in a carrying way only when the handle is in a forward position or a backward position, so that the self-test requirement is met when the current direction handle position is obtained, particularly in the forward position or the backward position;

and step 25, if the first, second, third and fourth judging results are all met, setting the first instruction data as a self-checking starting instruction.

Here, if the first, second, third, and fourth determination results cannot be all satisfied, the first instruction data is set to be null.

And 3, identifying the current self-checking state information of the traction converter.

When the traction converter is of an alternating current power supply traction converter type, the detection state information comprises a waiting self-detection state, a traction inverter self-detection state, a direct current conversion circuit self-detection state, a four-quadrant rectifier self-detection state and a self-detection ending state; when the traction converter is of a direct current power supply traction converter type, the detection state information comprises a waiting self-detection state, a traction inverter self-detection state, a direct current conversion circuit self-detection state and a self-detection ending state. The embodiment of the invention requires that the first instruction data, specifically a self-checking starting instruction, is responded only when the self-checking state information is in a waiting self-checking state; when the self-test state information is other than the waiting self-test state, the first instruction data is not responded even if it is generated.

Step 4, when the self-checking state information is the waiting self-checking state, identifying the first instruction data; if the first instruction data is a self-checking starting instruction, judging whether the traction converter currently meets self-checking conditions or not to generate corresponding first state data;

here, it is further determined whether the current state of the traction converter can satisfy the self-checking condition;

further, judging whether the traction converter currently meets the self-checking condition or not to generate corresponding first state data, which specifically comprises the following steps:

step A1, judging whether the current speed of the railway vehicle is lower than a preset minimum allowable speed V _min If (if)If yes, setting a fifth judging result to be satisfied;

here, similarly to the foregoing step 22, it is determined whether the railway vehicle is currently in a stationary state;

step A2, if the type of the traction converter is the type of the AC power supply traction converter, judging whether the four-quadrant rectifier is in a fault isolation state currently, and if not, setting a sixth judgment result to be satisfied;

step A3, judging whether the direct current conversion circuit is completely precharged currently, if so, setting a seventh judgment result to be satisfied;

step A4, judging whether the traction inverter is in a non-fault isolation state at present and the inversion IGBT device is not driven and enabled, if so, setting an eighth judging result to be satisfied;

Step A5, if the type of the traction converter is the type of the AC power supply traction converter, setting the first state data as a satisfied state when the fifth, sixth, seventh and eighth judging results are all satisfied; if the traction converter type is the direct current power supply traction converter type, setting the first state data as a satisfied state when the fifth, seventh and eighth judging results are all satisfied.

Here, if the traction converter is of the ac power traction converter type, the traction converter includes a four-quadrant rectifier, so that the fifth, sixth, seventh and eighth judgment results are satisfied; if the traction converter is of a direct current power supply traction converter type, the traction converter does not comprise a four-quadrant rectifier, so that the fifth, seventh and eighth judging results are all required to be met.

Step 5, when the first state data is a satisfied state, identifying the type of the traction converter; when the traction converter is of an alternating current power supply traction converter type, turning to a step 6; when the traction converter type is a dc powered traction converter type, the process proceeds to step 7.

Step 6, carrying out self-checking treatment on the traction converter by using the AC power supply traction converter to generate corresponding self-checking report data; turning to step 8;

The method specifically comprises the following steps: step 61, switching the self-checking state information into a traction inverter self-checking state; performing first self-checking treatment on the traction inverter to generate corresponding first self-checking result data;

further, performing a first self-checking process on the traction inverter to generate corresponding first self-checking result data, which specifically includes:

step B1, taking a traction motor as a self-checking load;

step B2, setting a three-phase current target value I _{s_aim} The method comprises the steps of carrying out a first treatment on the surface of the According to the single-phase equivalent circuit of the traction motor, calculating to obtain an open-loop modulation voltage given value V _{S_cons} And an open-loop modulation frequency setpoint f _{s_cons} ；

Here, three-phase current target value I _{s_aim} Namely, a stator three-phase current target value is set, and a three-phase current target value I is set _{s_aim} At the same time, correspondingly setting a motor torque target value C _{e_aim} (empirically selected to be less than 5% of maximum motor torque), three-phase current target value I _{s_aim} With a motor torque target value C _{e_aim} The set rules of (1) should be: the motor current can be ensured to provide a certain observable current for the traction inverter output three-phase current sensor, and the motor torque can be ensured to be smaller, so that the railway vehicle can keep static and displacement-free; as shown in fig. 4, which is a schematic diagram of a single-phase equivalent circuit of a traction motor according to a first embodiment of the present invention, fig. 4 shows:

Z in ₁ 、Z ₂ 、Z _m Equivalent impedance of the stator branch, the rotor branch and the excitation branch are represented respectively; l (L) ₁ 、L ₂ 、L _m 、R ₁ 、R ₂ The characteristic parameters of the traction motor respectively represent stator inductance, rotor inductance, exciting inductance, stator resistance and rotor resistance; omega _s For stator angular velocity, ω _s ＝f _s ，f _s Is the stator electrical frequency. g is slip, g= (ω) _s -ω _r )/ω _s . Due to traction electricityThe machine is in a rotor locked state, so omega _r Slip g=1;

further according to kirchhoff's voltage law, kirchhoff's current law and motor torque formula, can be obtained:

wherein the stator current I _s Rotor current I _r Stator voltage V _s Motor torque C _e Are all unknown quantities; motor pole pair number N _pp And other parameters are known amounts; setting I _s ＝I _{s_aim} (empirically selected to be greater than 10% of the three-phase current measurement range of the inverter), to obtain a very small motor torque, set C _e ＝C _{e_aim} (empirically selected to be less than 5% of maximum motor torque); the open-loop modulation voltage set value V can be obtained according to the above steps (1) and (2) _{S_cons} And an open-loop modulation frequency setpoint f _{s_cons} ＝ω _{s_cons} /(2π)；

Step B3, according to the three-phase current target value I _{s_aim} And a preset three-phase current error coefficient T _inv Calculating three-phase current minimum value I _{s_min} ＝I _{s_aim} *(1-T _inv ) Maximum value of three-phase current I _{s_max} ＝I _{s_aim} *(1+T _inv ) The method comprises the steps of carrying out a first treatment on the surface of the And take I as _{s_min} Is lower limit, I _{s_max} Establishing a first current range as an upper limit;

step B4, controlling the traction motor to be in a rotor locked state by performing air parking braking operation on the railway vehicle in a static state; and according to the open-loop modulation voltage set point V _{S_cons} And an open-loop modulation frequency setpoint f _{s_cons} The modulation control pulse is sent to the inversion IGBT device to control the traction inverter to enter an open loop control mode;

step B5, when the continuous working time length of the traction inverter in the open loop control mode exceeds the first preset time length m ₁ When the feedback information of the output three-phase current sensor is obtained, the corresponding first current I 'is generated' _s The method comprises the steps of carrying out a first treatment on the surface of the And to contravariantAcquiring fault information of the IGBT device to generate corresponding first fault data;

step B6, when the first current I' _s When the first current range is met and the first fault data are empty, setting the first self-checking result data as successful self-checking; when the first current I' _s When the first current range is not satisfied or the first fault data is not empty, the first current I 'is used for generating a first fault signal' _s The first observation current range and the first fault data form first self-checking result data;

step B7, after the first self-checking result data is obtained, controlling the traction inverter to return to a closed-loop control mode;

as can be seen from the above steps B1-B7, the first self-test process is actually a self-test process for the traction inverter, when I _{s_aim} *(1-T _inv )≤I' _s ≤I _{s_aim} *(1+T _inv ) And when all inversion IGBT devices of the traction inverter have no fault information, the self-checking treatment of the traction inverter is successful, otherwise, the self-checking treatment fails; after the self-checking is finished, the working mode of the traction inverter is restored to be before the test;

step 62, when the first self-checking process is finished, switching the self-checking state information to a self-checking state of the direct current conversion circuit; and performing second self-checking treatment on the direct current conversion circuit to generate corresponding second self-checking result data;

further, performing a second self-checking process on the dc conversion circuit to generate corresponding second self-checking result data, which specifically includes:

step C1, taking a brake resistor box as a self-checking load; the method comprises the steps of sending control pulse to a chopping IGBT device of a direct current conversion circuit to control the direct current conversion circuit to enter an open loop control mode, wherein the duty ratio is set to be the duty ratio K _cons ；

Step C2, according to the set duty ratio K _cons And a preset DC conversion circuit input voltage V _dc Resistance value R of brake resistor box _chop Error coefficient T of chopper current _chop Calculating the minimum value I of the chopping current _{chop_min} ＝V _dc *(1-T _chop )*K _cons /R _chop Maximum value of chopper current I _{chop_max} ＝V _dc *(1+T _chop )*K _cons /R _chop The method comprises the steps of carrying out a first treatment on the surface of the And take I as _{chop_min} Is lower limit, I _{chop_max} Establishing a second current range as an upper limit;

step C3, when the continuous working time length of the direct current conversion circuit in the open loop control mode exceeds the second preset time length m ₂ When the chopper current sensor is in the power-on state, the feedback information of the chopper current sensor is acquired to generate a corresponding second current I _chop The method comprises the steps of carrying out a first treatment on the surface of the Obtaining fault information of the chopping IGBT device to generate corresponding second fault data;

step C4, when the second current I _chop When the second current range is met and the second fault data is empty, setting the second self-checking result data as the self-checking success; when the second current I _chop When the second current range is not satisfied or the second fault data is not empty, the second current I _chop The second current range and the second fault data form second self-checking result data;

step C5, after the second self-checking result data is obtained, controlling the direct current conversion circuit to return to a closed-loop control mode;

as can be seen from the above steps C1-C5, the second self-test process is actually a self-test process for the DC conversion circuit, when V _dc *(1-T _chop )*K _cons /R _chop ≤I _chop ≤V _dc *(1+T _chop )*K _cons /R _chop And when all chopper IGBT devices of the direct current conversion circuit have no fault information, the self-checking treatment of the direct current conversion circuit is successful, otherwise, the self-checking treatment fails; after the self-checking is finished, the working mode of the direct current conversion circuit is restored to be before the test;

step 63, when the second self-checking process is finished, the self-checking state information is switched to the self-checking state of the four-quadrant rectifier; performing third self-checking treatment on the four-quadrant rectifier to generate corresponding third self-checking result data;

Further, performing a third self-checking process on the four-quadrant rectifier to generate corresponding third self-checking result data, which specifically includes:

step D1, taking a brake resistor box and other direct-current side loads as self-checking loads; and pass throughSending control pulse to a rectification IGBT device of the four-quadrant rectifier, and controlling the four-quadrant rectifier to be in a closed-loop control mode so as to enable the four-quadrant rectifier to work in a loaded state; and the direct current conversion circuit is controlled to enter an open loop control mode by sending control pulse to a chopping IGBT device of the direct current conversion circuit, wherein the duty ratio is set to be the duty ratio K _cons ；

Step D2, constructing a third current range;

wherein the lower limit of the third current range is the minimum value I of the four-quadrant input current _{4QC_min} The upper limit is the maximum value I of the four-quadrant input current _{4QC_max} ，

I _{4QC_min} ＝P _chop /(N _4QC *V _AC )，

I _{4QC_max} ＝(P _chop +P _{Aux_max} )/(N _4QC *V _AC ),

P _chop For the power consumption of the DC conversion circuit, P _{Aux_max} Maximum power for other DC side loads, N _4QC The number of the parallel rectifying modules of the four-quadrant rectifier is V _AC An input power supply voltage for the four-quadrant rectifier;

step D3, when the continuous working time of the direct current conversion circuit in the open loop control mode exceeds the third preset time m ₃ When the feedback information of the input current sensor is acquired, a corresponding third current I is generated _4QC The method comprises the steps of carrying out a first treatment on the surface of the Obtaining fault information of the rectification IGBT device to generate corresponding third fault data;

Step D4, when the third current I _4QC When the third current range is met and the third fault data is empty, setting the third self-checking result data as the self-checking success; when the third current I _4QC When the third current range is not satisfied or the third fault data is not empty, the third current I _4QC The third current range and the third fault data form third self-checking result data;

step D5, after obtaining the third self-checking result data, controlling the four-quadrant rectifier to maintain a closed-loop control mode, and returning the direct-current conversion circuit to the closed-loop control mode;

as can be seen from the above steps D1-D5, the third self-test process is actually a self-test process for the four-quadrant rectifier, when P _chop /(N _4QC *V _AC )≤I _4QC ≤(P _chop +P _{Aux_max} )/(N _4QC *V _AC ) And when all rectification IGBT devices of the four-quadrant rectifier have no fault information, the self-checking treatment of the four-quadrant rectifier is successful, otherwise, the self-checking treatment fails; after the self-checking is finished, the working modes of the four-quadrant rectifier and the direct current conversion circuit are restored to be before the testing;

step 64, when the third self-checking process is finished, the self-checking state information is switched to a self-checking finishing state; and performing first data integration processing on the first, second and third self-checking result data to generate self-checking report data;

here, since the type of the traction converter currently self-inspected is an ac-powered traction converter, the self-inspection report includes first, second, and third self-inspection result data of the traction inverter, the dc conversion circuit, and the four-quadrant rectifier;

Step 65, after obtaining the self-checking report data, switching the self-checking state information back to the waiting self-checking state; and goes to step 8.

Here, since the embodiment of the present invention provides that the self-test start instruction is responded only when the self-test state information is the self-test waiting state, it is necessary to switch back to the self-test waiting state after the whole self-test of the traction converter is ended.

Step 7, performing self-checking treatment on the traction converter by using the direct current power supply traction converter to generate self-checking report data;

the method specifically comprises the following steps: step 71, switching the self-checking state information to a traction inverter self-checking state; performing first self-checking treatment on the traction inverter to generate corresponding first self-checking result data;

here, similar to step 61, further description will be omitted;

step 72, when the first self-checking process is finished, switching the self-checking state information into a self-checking state of the direct current conversion circuit; and performing second self-checking treatment on the direct current conversion circuit to generate corresponding second self-checking result data;

here, similar to step 62, further description will be omitted;

step 73, when the second self-checking process is finished, the self-checking state information is switched to a self-checking finishing state; and performing second data integration processing on the first and second self-checking result data to generate self-checking report data;

Here, similar to step 63, but because the type of traction converter currently being self-tested is a dc-powered traction converter, and the dc-powered traction converter does not include a four-quadrant rectifier, the self-test report will only include first and second self-test result data for the traction inverter and the dc-conversion circuit;

step 74, after obtaining the self-checking report data, the self-checking state information is switched back to the waiting self-checking state.

Here, similar to step 65, further description is omitted.

And step 8, sending the self-checking report data back to the driver.

Here, the self-test report data is presented to the driver through the driver operation panel.

It should be noted that, in the self-checking process of the ac power supply traction converter in step 6 and the self-checking process of the dc power supply traction converter in step 7, the embodiment of the present invention further continuously determines whether the traction converter currently meets the self-checking condition according to steps A1-A5 to generate real-time first state data; if the real-time first state data obtained at any time is not in a satisfied state, switching the self-checking state information into a self-checking interrupt state; and immediately stopping the currently ongoing self-test process; the working mode of the traction inverter, the direct current conversion circuit or the four-quadrant rectifier which is self-checked at present is restored to be before self-check; and sending back the preset interrupt self-checking report data to the driver, and switching the self-checking state information back to the waiting self-checking state after sending back.

The system for implementing the method described in the first embodiment of the present invention has a structure as shown in fig. 5, which is a schematic structural diagram of a high-voltage on-load self-checking system of a traction converter of a rail vehicle according to a second embodiment of the present invention, where the system includes: a human interface unit 201, a traction control unit 202, a traction inverter 203 and a load device group 204.

The human interface unit 201 includes a driver operation panel 2011 and a communication interface 2012; the driver operation panel 2011 is connected with the communication interface 2012; communication interface 2012 is coupled to traction control unit 202; the driver operation panel 2011 is configured to receive first request data sent by a driver; when the first request data is a test request, judging whether the railway vehicle currently meets the self-checking condition or not, and generating corresponding first instruction data according to a judging result; and transmits the first instruction data to traction control unit 202 via communication interface 2012; and receives self-test report data returned from traction control unit 202 back to the driver.

The traction control unit 202 is connected with a traction converter 203; the traction control unit 202 is used for identifying the current self-checking state information of the traction converter 203; when the self-checking state information is in a waiting self-checking state, identifying the first instruction data; if the first instruction data is a self-checking starting instruction, judging whether the traction converter 203 currently meets the self-checking condition or not to generate corresponding first state data; and when the first status data is a satisfied status, identifying the type of the traction converter 203; when the type of the traction converter 203 is the type of the AC power supply traction converter, carrying out self-checking treatment on the AC power supply traction converter 203 to generate self-checking report data; when the type of the traction converter 203 is the direct current power supply traction converter type, performing self-checking processing on the direct current power supply traction converter 203 to generate self-checking report data; and sends the self-test report data back to the human interface unit 201.

The traction converter 203 is connected with the load equipment group 204; traction converter 203 includes a four-quadrant rectifier 2031, a dc conversion circuit 2032, and a traction inverter 2033 when the type is an ac power traction converter type, and includes a dc conversion circuit 2032 and a traction inverter 2033 when the type is a dc power traction converter type.

When the traction converter 203 is of an ac power supply traction converter type, the input end of the four-quadrant rectifier 2031 is connected with ac power supply equipment, and the output end of the four-quadrant rectifier 2031 is respectively connected with the input end of the dc conversion circuit 2032 and the input ends of other dc side loads 2043 of the load equipment group 204; the four-quadrant rectifier 2031 includes an input current sensor and a plurality of rectifying IGBT devices; the input current sensor is used for collecting input current of the four-quadrant rectifier 2031 and feeding back collected information to the traction control unit 202; the rectifying IGBT device is configured to receive the control pulse sent from the traction control unit 202 and adjust the four-quadrant rectifier 2031 according to the control pulse to realize an open-loop or closed-loop control mode.

The input terminal of the dc conversion circuit 2032 is connected to the dc power supply apparatus when the type of the traction converter 203 is the dc power supply traction converter type; the output end of the direct current conversion circuit 2032 is connected to the input end of the traction inverter 2033 and the brake resistor box 2042 of the load equipment group 204, respectively; the direct current conversion circuit 2032 includes an output chopper current sensor and a plurality of chopper IGBT devices; the output chopper current sensor is used for collecting the output chopper current of the direct current conversion circuit 2032 and feeding back collected information to the traction control unit 202; the chopper IGBT device is configured to receive a control pulse sent from the traction control unit 202 and adjust the dc conversion circuit 2032 according to the control pulse to realize an open-loop or closed-loop control mode.

An output of the traction inverter 2033 is connected to an input of the traction motor 2041 of the load device group 204; traction inverter 2033 includes an output three-phase current sensor and a plurality of inverter IGBT devices; the output three-phase current sensor is used for collecting output three-phase current of the traction inverter 2033 and feeding back collected information to the traction control unit 202; the inverter IGBT device is configured to receive the control pulse sent from the traction control unit 202 and adjust the traction inverter 2033 according to the control pulse to implement an open-loop or closed-loop control mode.

The load device group 204 includes other dc side loads 2043, a brake resistor housing 2042, and a traction motor 2041.

The high-voltage on-load self-checking system for the traction converter of the railway vehicle provided by the embodiment II of the invention can execute the method steps in the method embodiment, and the implementation principle and the technical effect are similar, and are not repeated here.

In summary, the technical scheme of the high-voltage on-load self-checking method and system for the traction converter of the rail vehicle provided by the embodiment of the invention has at least the following technical effects or advantages: 1. the test is carried out without depending on manual experience, so that the comprehensiveness and accuracy of the test are improved; 2. the external detection device is not required to be added, the testing operation difficulty and the testing cost are reduced, and the testing efficiency is improved.

Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative elements and steps are described above generally in terms of function in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. 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 steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied in hardware, in a software module executed by a processor, or in a combination of the two. The software modules may be disposed in Random Access Memory (RAM), memory, read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.

Claims

1. A method for high voltage on-load self-test of a traction converter of a rail vehicle, the method comprising:

receiving first request data sent by a driver;

The self-checking report data is sent back to a driver;

the traction converter takes a traction motor, a braking resistor box and other direct-current side loads which are connected with the traction converter as working loads; the traction converter comprises a four-quadrant rectifier, a direct current conversion circuit and a traction inverter when the type of the traction converter is an alternating current power supply traction converter type, and comprises the direct current conversion circuit and the traction inverter when the type of the traction converter is a direct current power supply traction converter type;

the four-quadrant rectifier comprises an input current sensor and a plurality of rectifying IGBT devices; the direct current conversion circuit comprises an output chopper current sensor and a plurality of chopper IGBT devices; the traction inverter comprises an output three-phase current sensor and a plurality of inversion IGBT devices;

Judging whether the railway vehicle currently meets the self-checking condition or not and generating corresponding first instruction data according to a judging result, wherein the method specifically comprises the following steps:

if the first, second, third and fourth judging results are all met, setting the first instruction data as a self-checking starting instruction;

the step of judging whether the traction converter currently meets the self-checking condition or not to generate corresponding first state data specifically comprises the following steps:

2. The method for high-voltage on-load self-test of a traction converter of a rail vehicle according to claim 1, wherein the performing the self-test process of the traction converter with ac power supply to the traction converter generates corresponding self-test report data, specifically comprising:

3. The method for high-voltage on-load self-test of a traction converter of a rail vehicle according to claim 1, wherein the performing a dc-powered traction converter self-test process on the traction converter to generate the self-test report data specifically comprises:

4. The method for high-voltage on-load self-test of a traction converter of a rail vehicle according to claim 2 or 3, wherein the performing the first self-test on the traction inverter generates corresponding first self-test result data, specifically includes:

taking the traction motor as a self-checking load;

setting a three-phase current target value I _{s_aim} The method comprises the steps of carrying out a first treatment on the surface of the According to the single-phase equivalent circuit of the traction motor, calculating to obtain an open-loop modulation voltage given value V _{S_cons} And open loop tuningFrequency control set point f _{s_cons} ；

5. The method for high-voltage on-load self-test of a traction converter of a rail vehicle according to claim 2 or 3, wherein the performing the second self-test on the dc conversion circuit generates corresponding second self-test result data, specifically includes:

when the continuous working time length of the direct current conversion circuit in the open loop control mode exceeds a second preset time length m ₂ When the output chopper current sensor is in a power-on state, the feedback information of the output chopper current sensor is acquired to generate a corresponding second current I _chop The method comprises the steps of carrying out a first treatment on the surface of the Obtaining fault information of the chopping IGBT device to generate corresponding second fault data;

6. The method for high-voltage on-load self-test of a traction converter of a rail vehicle according to claim 5, wherein the performing a third self-test on the four-quadrant rectifier generates corresponding third self-test result data, and specifically comprises:

I _{4QC_min} ＝P _chop /(N _4QC *V _AC )，

I _{4QC_max} ＝(P _chop +P _{Aux_max} )/(N _4QC *V _AC ),

P _chop ＝V ² _dc *K _cons /R _chop ,

when the third current I _4QC Setting the third self-checking result data as the success of self-checking when the third current range is met and the third fault data is empty; when the third current I _4QC When the third current range is not satisfied or the third fault data is not empty, the third current I _4QC The third current range and the third fault data constitute the thirdThirdly, self-checking result data;

7. A system for implementing the rail vehicle traction converter high voltage on-load self-test method of any one of claims 1-6, the system comprising: the system comprises a man-machine interface unit, a traction control unit, a traction converter and a load equipment group;

when the traction converter is of an alternating current power supply traction converter type, the input end of the four-quadrant rectifier is connected with alternating current power supply equipment, and the output end of the four-quadrant rectifier is respectively connected with the input end of the direct current conversion circuit and the input ends of other direct current side loads of the load equipment group; the four-quadrant rectifier comprises an input current sensor and a plurality of rectifying IGBT devices; the input current sensor is used for collecting input current of the four-quadrant rectifier and feeding back collected information to the traction control unit; the rectification IGBT device is used for receiving the control pulse sent from the traction control unit and adjusting the four-quadrant rectifier according to the control pulse to realize an open-loop or closed-loop control mode;

The output end of the traction inverter is connected with the input end of the traction motor of the load equipment group; the traction inverter comprises an output three-phase current sensor and a plurality of inversion IGBT devices; the output three-phase current sensor is used for collecting output three-phase current of the traction inverter and feeding back collected information to the traction control unit; the inversion IGBT device is used for receiving the control pulse sent from the traction control unit and adjusting the traction inverter to enter an open-loop or closed-loop control mode according to the control pulse;