CN114475255A - High-voltage on-load self-checking method and system for traction converter of railway vehicle - Google Patents

Abstract

The embodiment of the invention relates to 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, wherein the method comprises the following steps: receiving first request data; when the test request is received, judging whether the rail vehicle meets the self-checking condition currently, and generating first instruction data according to a judgment result; identifying the current self-checking state information of the traction converter; identifying the first instruction data when the self-checking state is waited; judging whether the current traction converter meets the self-checking condition or not to generate corresponding first state data if the current traction converter meets the self-checking condition; identifying the type of the traction converter when the condition is met; when the type of the AC power supply traction converter is the type of the AC power supply traction converter, carrying out self-checking processing 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 the direct current power supply traction converter type, performing self-checking processing on the direct current power supply traction converter to generate self-checking report data; and sending the self-checking report data back to the driver. The scheme can improve the test accuracy.

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 carrying out electric energy conversion on traction power supply and controlling a traction motor to realize the functions of vehicle traction, braking and speed regulation operation. The traction power supply system of the railway vehicle is mainly divided into alternating current power supply and direct current power supply. The ac-powered traction converter is usually an ac-dc-ac topology, and is composed of a four-quadrant rectifier, a dc conversion circuit, and a traction inverter. The dc-powered traction converter is generally in a dc-ac topology and is composed of a dc conversion circuit and a traction inverter.

The detection of the functions and the high-voltage working state of main electrical devices of the traction converter before the rail vehicle is launched (namely, in the vehicle static state) is very important, and faults can be found in advance so as to guarantee the positive line operation state of the vehicle. The existing detection method mainly comprises manual operation test of a driver. The manual operation test needs to manually execute the operation procedure and manually judge partial test results, and the problems of accidental misjudgment and incomplete function test exist.

Disclosure of Invention

The invention aims to provide 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, which aim to overcome the defects of the prior art, and enable the traction converter to be in a high-voltage on-load state by controlling a power switch Insulated Gate Bipolar Transistor (IGBT) device of the traction converter on the premise of not increasing an external detection device, obtain corresponding working current through a current sensor, and set the self-checking state of the traction converter based on whether the working current is in a set range and whether the IGBT device of the power switch fails. By the scheme, dependence on manual factors can be eliminated during self-checking of the traction converter; the test is carried out based on the vehicle-mounted existing device, an external detection device does not need to be added, and the test operation difficulty and the test 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-test method for a traction converter of a railway vehicle, where the method includes:

receiving first request data sent by a driver;

when the first request data is a test request, judging whether the rail vehicle meets a self-checking condition currently, and generating corresponding first instruction data according to a judgment 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 meets self-checking conditions currently 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, carrying out 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 self-checking processing on the traction converter to generate self-checking report data;

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

Preferably, the traction converter takes a traction motor, a brake resistance 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 type of the traction converter is 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 type of the traction converter is a direct current supply traction converter type, the input end of the direct current conversion circuit is connected with direct current 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 resistance 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 chopping current sensor and a plurality of chopping IGBT devices; the traction inverter comprises an output three-phase current sensor and a plurality of inverter IGBT devices.

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

judging whether at least one of all current main circuit breakers of the railway vehicle is closed, and if so, setting a first judgment result as a satisfaction;

judging whether the current speed of the rail vehicle is lower than a preset minimum allowable speed V or not_minIf yes, setting a second judgment result as satisfied;

judging whether the traction converter is in a fault isolation state currently or not, and if not, setting a third judgment result as a satisfaction;

judging whether the handle position of the current direction of the railway vehicle is in a forward position or a backward position, and if so, setting a fourth judgment result as a satisfaction;

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

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

judging whether the current speed of the rail vehicle is lower than a preset minimum allowable speed V or not_minIf yes, setting a fifth judgment result as satisfied;

if the type of the traction converter is the type of an alternating current 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 as a satisfaction;

judging whether the direct current conversion circuit completes pre-charging at present, and if so, setting a seventh judgment result as satisfied;

judging whether the traction inverter is in a non-fault isolation state currently and the inversion IGBT device is not driven to be enabled, if so, setting an eighth judgment result as a satisfaction;

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

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

Preferably, the ac power supply traction converter self-checking processing is performed on the traction converter to generate corresponding self-checking report data, and the method specifically includes:

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

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

when the third self-checking processing is finished, the self-checking state information is switched to a self-checking finished 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, the self-checking state information is switched back to a waiting self-checking state.

Preferably, the performing of the dc-powered traction converter self-checking process on the traction converter to generate the self-checking report data specifically includes:

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

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

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

Further, the performing a 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}(ii) a And calculating to obtain the open-loop modulation voltage given value V according to the single-phase equivalent circuit of the traction motor_{S_cons}And open loop modulation frequency set value f_{s_cons}；

According to the three-phase current target value I_{s_aim}And a preset error coefficient T of three-phase current_invCalculating the minimum value I of three-phase current_{s_min}＝I_{s_aim}*(1-T_inv) Maximum value of three-phase current I_{s_max}＝I_{s_aim}*(1+T_inv) (ii) a And with I_{s_min}Is the lower limit, I_{s_max}At an upper limit, constructing a first current range;

controlling the traction motor to be in a rotor locked-rotor state by performing air parking brake operation on the rail vehicle in a static state; and areAccording to the given value V of the open-loop modulation voltage_{S_cons}And the given value f of the open-loop modulation frequency_{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 of the traction inverter in the open-loop control mode exceeds a first preset time m₁Then, obtaining the feedback information of the output three-phase current sensor to generate a corresponding first current I_s(ii) a Acquiring fault information of the inverter IGBT device to generate corresponding first fault data;

when the first current I_sWhen the first current range is met and the first fault data is empty, setting the first self-test result data as successful self-test; when the first current I_sThe first current I does not satisfy the first current range or the first fault data is not empty_sThe first observation current range and the first fault data form 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-test process on the dc conversion circuit to generate corresponding second self-test result data specifically includes:

taking the brake resistance box as a self-checking load; the direct current conversion circuit is controlled to enter an open-loop control mode by sending control pulses to the chopping IGBT device of the direct current conversion circuit, and the duty ratio of the direct current conversion circuit is a set duty ratio K_cons；

According to the set duty ratio K_consAnd a predetermined input voltage V of the DC converter circuit_dcResistance value R of brake resistor box_chopCurrent error coefficient of chopping T_chopCalculating the minimum value I of the chopping current_{chop_min}＝V_dc*(1-T_chop)*K_cons/R_chopMaximum value of chopping current I_{chop_max}＝V_dc*(1+T_chop)*K_cons/R_chop(ii) a And with I_{chop_min}Is the lower limit, I_{chop_max}At the upper limit, a second current range is constructed;

when the continuous working time of the direct current conversion circuit in the open loop control mode exceeds a second preset time m₂Then, feedback information of the output chopping current sensor is obtained to generate a corresponding second current I_chop(ii) a Acquiring fault information of the chopping IGBT device to generate corresponding second fault data;

when the second current I_chopWhen the second current range is met and the second fault data is empty, setting the second self-test result data as successful self-test; when the second current I_chopThe second current I does not satisfy the second current range or the second fault data is not empty_chopThe second current range and the second fault data form second self-test 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-test on the four-quadrant rectifier to generate corresponding third self-test result data specifically includes:

taking the brake resistance 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 pulses to the rectification IGBT device of the four-quadrant rectifier, so that the four-quadrant rectifier works in a load state; and controlling the direct current conversion circuit to enter an open-loop control mode by sending control pulses to the chopped IGBT device of the direct current conversion circuit, wherein the duty ratio of the direct current conversion circuit is a set 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_chopFor the power consumption of the DC converter circuit, P_{Aux_max}Is the maximum power, N, of the other DC-side loads_4QCThe number of parallel rectifier modules of the four-quadrant rectifier, V_ACIs the input supply voltage of 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 m₃Then, the feedback information of the input current sensor is obtained to generate a corresponding third current I_4QC(ii) a Acquiring fault information of the rectification IGBT device to generate corresponding third fault data;

when the third current I_4QCWhen the third current range is met and the third fault data is empty, setting the third self-checking result data as successful self-checking; when the third current I_4QCThe third current I is used when the third current range is not satisfied or the third fault data is not empty_4QCThe third current range and the third fault data constitute the third self-test result data;

and after the third self-checking result data are obtained, 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.

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

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 rail vehicle meets a self-checking condition currently, and generating corresponding first instruction data according to a judgment result; sending the first instruction data to the traction control unit through the communication interface; receiving self-checking report data sent back from the traction control unit and sending the report data back 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, identifying the first instruction data; if the first instruction data is a self-checking starting instruction, judging whether the traction converter meets self-checking conditions currently 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, carrying out self-checking processing on the traction converter by the alternating current power supply 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 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 type of the traction converter is 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 the 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 a control pulse sent by 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 supply equipment when the type of the traction converter is a direct current 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 brake resistance box of the load equipment group; the direct current conversion circuit comprises an output chopping current sensor and a plurality of chopping IGBT devices; the output chopping current sensor is used for collecting the output chopping current of the direct current conversion circuit and feeding back the collected information to the traction control unit; the chopping IGBT device is used for receiving the control pulse sent by the traction control unit and adjusting the direct current conversion circuit to realize an open-loop or closed-loop control mode according to the control pulse;

the output end of the traction inverter is connected with the input end of a 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 the output three-phase current of the traction inverter and feeding back the collected information to the traction control unit; the inversion IGBT device is used for receiving the control pulse sent by 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 equipment group comprises the other direct current side loads, the brake resistance 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, the main electrical devices of the traction converter can be automatically tested before the railway vehicle is sent out, and dependence on manual factors is eliminated; the vehicle-mounted existing device equipment is used for testing, an external detection device does not need 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-test method for 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-powered traction converter according to an embodiment of the present invention;

fig. 3 is a schematic block diagram of a dc-powered traction converter according to an embodiment of the present invention;

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

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

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

Fig. 1 is a schematic diagram of a high-voltage on-load self-test method for 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:

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

Here, the embodiment of the present invention provides a driver operation panel to a driver, and the panel acquires input information of the driver as first request data by connecting an input device such as an instruction button, a keyboard, a mouse, or a touch screen; the panel can be an independent operation panel or can be integrated on a driver general operation panel.

Before further explanation of the subsequent steps, a brief description of the traction converter to be tested according to an embodiment of the present invention is given here. The traction converter is connected with power supply equipment of the railway vehicle, and other external voltage devices are not used for supplying power to the traction converter during self-checking of the traction converter. On a railway vehicle, a load equipment group connected with a traction converter comprises a traction motor, a brake resistance box and other direct-current side loads.

When the traction converter of the embodiment of the present invention is an ac-powered traction converter, the traction converter includes a four-quadrant rectifier, a dc conversion circuit, and a traction inverter, as shown in fig. 2, which is a schematic block diagram of an ac-powered traction converter provided in an embodiment of the present invention; when the type of the dc power traction converter is a dc power traction converter, the dc power traction converter includes a dc conversion circuit and a traction inverter, as shown in fig. 3, which is a schematic block diagram of a dc power traction converter according to an embodiment of the present invention. The four-quadrant rectifier comprises an input current sensor and a plurality of rectifying IGBT devices; the direct current conversion circuit comprises an output chopping current sensor and a plurality of chopping IGBT devices; the traction inverter comprises an output three-phase current sensor and a plurality of inverting IGBT devices.

When the type of the traction converter is 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 a 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 type of the traction converter is a direct current supply traction converter type, the input end of the direct current conversion circuit is connected with direct current 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 rail vehicle meets a self-checking condition at present, and generating corresponding first instruction data according to a judgment result;

when the first request data is a test request, a driver initiates a self-test application for the traction converter, before self-test, whether the current state of the railway vehicle meets self-test conditions of the traction converter needs to be judged in advance, and if yes, first instruction data which are self-test starting instructions are generated;

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

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

step 22, judging whether the current speed of the rail vehicle is lower than the preset minimum allowable speed V or not_minIf yes, setting a second judgment result as satisfied;

here, the lowest allowable speed V_minIs a preset speed minimum value which is lower than the lowest allowable speed V_minThe rail vehicle is considered to be in a stationary state; from the foregoing, the self-test of the traction converter is performed before the vehicle runs, so that 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, and if not, setting a third judgment result as a satisfaction;

here, once the traction converter of the embodiment of the present invention has a fault and enters the isolation state, the traction converter stores the corresponding fault isolation information, the fault isolation information is not inactivated until the corresponding fault is resolved, and if the fault isolation information in the non-inactivated state is obtained in the current step, it means that the traction converter is currently in the fault isolation state and does not meet the self-test requirement; otherwise, if any fault isolation information in a non-inactivated state cannot be obtained, the fact that the traction converter is not in a fault isolation state currently means that the self-test requirement is met;

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

the test of the traction converter in the embodiment of the invention is an on-load test, and the on-load connection of the traction converter is completed through a direction handle; the handle position of the direction handle is only in the forward position or the backward position to carry out on-load connection, so that the requirement of self-test is determined to be met when the current direction handle position is obtained, namely the forward position or the backward position;

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

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

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

When the type of the traction converter is 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; and when the type of the traction converter is 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 which is specifically the self-checking starting instruction is responded only when the self-checking state information is in the waiting self-checking state; when the self-test state information is in the other state other than the waiting self-test state, the first instruction data is not responded to even if it is generated.

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

here, whether the current state of the traction converter can meet the self-checking condition is further judged;

further, whether current to the traction current transformer satisfies the self-checking condition and judges the first state data that generates the correspondence, specifically include:

step A1, judging whether the current speed of the rail vehicle is lower than the preset lowest allowable speed V_minIf yes, setting a fifth judgment result as satisfied;

here, similarly to the foregoing step 22, it is judged whether or not the rail vehicle is currently in a stationary state;

step A2, if the type of the traction converter is the type of an alternating current 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 as a satisfaction;

step A3, determining whether the DC conversion circuit has completed pre-charging, if yes, setting a seventh determination result to be satisfied;

step A4, judging whether the traction inverter is in a non-fault isolation state currently and the inversion IGBT device is not driven to enable, if so, setting an eighth judgment result as satisfied;

step A5, if the type of the traction converter is an alternating current power supply traction converter type, setting first state data as a satisfied state when the fifth, sixth, seventh and eighth judgment 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 judgment result, the seventh judgment result and the eighth judgment result are all satisfied.

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

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

Step 6, carrying out self-checking processing on the traction converter by using an alternating current 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 self-checking state of the traction inverter; carrying out first self-checking processing on the traction inverter to generate corresponding first self-checking result data;

further, carry out first self-checking to the traction inverter and handle and generate corresponding first self-checking result data, specifically include:

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

step B2, setting three-phase current target value I_{s_aim}(ii) a And calculating to obtain the open-loop modulation voltage given value V according to the single-phase equivalent circuit of the traction motor_{S_cons}And open loop modulation frequency set value f_{s_cons}；

Here, the three-phase current target value I_{s_aim}I.e. the three-phase current target value of the stator, setting the three-phase current target value I_{s_aim}At the same time, the target value C of the motor torque is set correspondingly_{e_aim}(empirically selected to be less than 5% of maximum motor torque), three phase current target value I_{s_aim}With a target value of motor torque C_{e_aim}The setting rule of (1) should be: the motor current can be ensured to provide certain observable current for the traction inverter to output a three-phase current sensor, and the motor torque can be ensured to be smaller, so that the railway vehicle can be kept static without displacement; 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, and can be obtained from fig. 4:

in the formula Z₁、Z₂、Z_mRespectively representing equivalent impedances of the stator branch, the rotor branch and the excitation branch; l is₁、L₂、L_m、R₁、R₂Representing the stator inductance for the characteristic parameters of the traction motorThe rotor inductor, the excitation inductor, the stator resistor and the rotor resistor; omega_sIs stator angular velocity, ω_s＝f_s，f_sThe stator electrical frequency. g is slip, g ═ ω_s-ω_r)/ω_s. Since the traction motor is in a rotor locked-rotor state, ω_r0, slip g 1;

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

I_s＝V_s*(Z₂+Z_m)/(Z₁Z₂+Z₁Z_m+Z₂Z_m)

I_r＝V_s*Z_m/(Z₁Z₂+Z₁Z_m+Z₂Z_m) (2)

C_e＝3*N_pp*(R₂/g)*ω_s*(I_r)²

wherein the stator current I_sRotor current I_rStator voltage V_sMotor torque C_eAre all unknown quantities; number of pole pairs N of motor_ppAnd other parameters are known quantities; setting I_s＝I_{s_aim}(empirically selected to be greater than 10% of the inverter three phase current measurement range) to obtain a very small motor torque, set C_e＝C_{e_aim}(empirically selected to be less than 5% of maximum motor torque); according to the above formulas (1) and (2), the given value V of the open-loop modulation voltage can be obtained_{S_cons}And open loop modulation frequency set value f_{s_cons}＝ω_{s_cons}/(2π)；

Step B3, according to the three-phase current target value I_{s_aim}And a preset error coefficient T of three-phase current_invCalculating the minimum value I of three-phase current_{s_min}＝I_{s_aim}*(1-T_inv) Maximum value of three-phase current I_{s_max}＝I_{s_aim}*(1+T_inv) (ii) a And with I_{s_min}Is the lower limit, I_{s_max}At an upper limit, constructing a first current range;

step B4, by making the rail vehicle in a stationary statePerforming air parking braking operation in the state to control the traction motor to be in a rotor locked-rotor state; and according to the open-loop modulation voltage set value V_{S_cons}And open loop modulation frequency set value f_{s_cons}Modulation control pulses are sent to an inversion IGBT device to control a traction inverter to enter an open-loop control mode;

step B5, when the continuous working time of the traction inverter in the open-loop control mode exceeds a first preset time m₁Then, obtaining feedback information of the output three-phase current sensor to generate corresponding first current I'_s(ii) a Acquiring fault information of the inverter IGBT device to generate corresponding first fault data;

step B6, when the first current is l'_sWhen the first current range is met and the first fault data are empty, setting the first self-checking result data as the self-checking success; when the first current is'_sNot satisfying the first current range or the first fault data is not empty, from the first current I'_sThe 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;

here, as can be seen from the above-mentioned 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) When all inversion IGBT devices of the traction inverter have no fault information, the self-checking processing of the traction inverter is successful, and otherwise, the self-checking processing fails; after the self-checking is finished, the working mode of the traction inverter is recovered to the state before the test;

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

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

step C1, using the brake resistance box as a self-checking load; by converting to DCThe chopping IGBT device of the switching circuit sends control pulses to control the direct current switching circuit to enter an open-loop control mode, and the duty ratio of the direct current switching circuit is a set duty ratio K_cons；

Step C2, according to the set duty ratio K_consAnd a predetermined input voltage V of the DC converter circuit_dcResistance value R of brake resistor box_chopCurrent error coefficient of chopping T_chopCalculating the minimum value I of the chopping current_{chop_min}＝V_dc*(1-T_chop)*K_cons/R_chopMaximum value of chopping current I_{chop_max}＝V_dc*(1+T_chop)*K_cons/R_chop(ii) a And with I_{chop_min}Is the lower limit, I_{chop_max}At the upper limit, a second current range is constructed;

step C3, when the continuous working time of the DC conversion circuit in the open loop control mode exceeds a second preset time m₂Then, feedback information of the output chopping current sensor is acquired to generate a corresponding second current I_chop(ii) a Acquiring fault information of the chopping IGBT device to generate corresponding second fault data;

step C4, when the second current I is applied_chopWhen the second current range is met and the second fault data are null, setting the second self-checking result data as successful self-checking; when the second current I_chopWhen the second current range is not satisfied or the second fault data is not empty, the second current I is used_chopThe second current range and the second fault data form second self-checking result data;

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

here, as can be seen from the above steps C1-C5, the second self-test process is actually a self-test process for the dc converter circuit when V is_dc*(1-T_chop)*K_cons/R_chop≤I_chop≤V_dc*(1+T_chop)*K_cons/R_chopWhen all chopping IGBT devices of the direct current conversion circuit have no fault information, the self-checking processing of the direct current conversion circuit is successful, and otherwise, the self-checking processing fails; after self-checking, of the dc-to-dc converter circuitThe working mode is recovered to the state before the test;

step 63, when the second self-checking processing is finished, switching the self-checking state information into a self-checking state of the four-quadrant rectifier; carrying out third self-checking processing on the four-quadrant rectifier to generate corresponding third self-checking result data;

further, performing a third self-test process on the four-quadrant rectifier to generate corresponding third self-test result data, specifically including:

step D1, using the brake resistance box and 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 pulses to a rectification IGBT device of the four-quadrant rectifier, so that the four-quadrant rectifier works in a load state; and the control pulse is sent to a chopping IGBT device of the direct current conversion circuit to control the direct current conversion circuit to enter an open-loop control mode, wherein the duty ratio of the direct current conversion circuit is a set 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_chopFor the power consumption of the DC converter circuit, P_{Aux_max}For maximum power of other DC side loads, N_4QCNumber of parallel rectifier modules, V, of four-quadrant rectifier_ACIs the input supply voltage of the four-quadrant rectifier;

step D3, when the continuous working time of the DC conversion circuit in the open-loop control mode exceeds a third preset time m₃Then, feedback information of the input current sensor is obtained to generate a corresponding third current I_4QC(ii) a Acquiring fault information of the rectifying IGBT device to generate corresponding third fault data;

step D4, when the third current I is applied_4QCIf the third current range is met and the third fault data is empty, setting the third self-checking result data as successful self-checking; when the third current I_4QCWhen the third current range is not satisfied or the third fault data is not empty, the third current I is used_4QCThe third current range and the third fault data form third self-checking result data;

step D5, after the third self-checking result data is obtained, 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;

here, 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 is_chop/(N_4QC*V_AC)≤I_4QC≤(P_chop+P_{Aux_max})/(N_4QC*V_AC) When all the rectifying IGBT devices of the four-quadrant rectifier have no fault information, the self-checking processing of the four-quadrant rectifier is successful, and otherwise, the self-checking processing fails; after the self-test is finished, the working modes of the four-quadrant rectifier and the direct current conversion circuit are restored to the states before the test;

step 64, when the third self-checking processing is finished, switching the self-checking state information into a self-checking finished state; 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 traction converter currently self-tested is an ac-powered traction converter, the self-test report includes first, second, and third self-test result data of the traction inverter, the dc conversion circuit, and the four-quadrant rectifier;

step 65, after the self-checking report data is obtained, switching the self-checking state information back to a waiting self-checking state; and go to step 8.

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

Step 7, carrying out self-checking processing 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 into a self-checking state of the traction inverter; carrying out first self-checking processing on the traction inverter to generate corresponding first self-checking result data;

here, similar to step 61, further description is omitted;

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

here, similar to step 62, further description is not given;

step 73, when the second self-checking processing is finished, switching the self-checking state information into a self-checking finished state; 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 since the type of traction converter currently self-tested is a dc-fed traction converter, which does not include a four-quadrant rectifier, the self-test report will only include the first and second self-test result data of the traction inverter and the dc conversion circuit;

and step 74, after the self-checking report data is obtained, switching the self-checking state information back to a waiting self-checking state.

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

And 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 may further continuously determine 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 moment is not in a satisfied state, switching the self-checking state information into a self-checking interruption state; and immediately stopping the current self-checking process; restoring the working mode of the traction inverter, the direct current conversion circuit or the four-quadrant rectifier which is self-checked at present to the state before self-checking; 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 the report is sent back.

Fig. 5 is a schematic structural diagram of a high-voltage on-load self-test system for a traction converter of a railway vehicle according to a second embodiment of the present invention, where the system for implementing the method described in the first embodiment includes: a human machine interface unit 201, a traction control unit 202, a traction converter 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 to the communication interface 2012; the communication interface 2012 is connected to the traction control unit 202; the driver operation panel 2011 is used for receiving first request data sent by a driver; when the first request data is a test request, judging whether the rail vehicle meets a self-checking condition currently, and generating corresponding first instruction data according to a judgment result; and sends the first command data to the traction control unit 202 through the communication interface 2012; and receives self-test report data back from the traction control unit 202 to the driver.

The traction control unit 202 is connected with the 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 meets the self-checking condition currently to generate corresponding first state data; and when the first state data is a satisfied state, identifying the type of the traction converter 203; when the type of the traction converter 203 is the type of the alternating current power supply traction converter, the traction converter 203 is subjected to self-checking processing to generate self-checking report data; when the type of the traction converter 203 is the type of the direct-current power supply traction converter, the traction converter 203 is subjected to self-checking processing 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 a load equipment group 204; the 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-powered traction converter type, and includes a dc conversion circuit 2032 and a traction inverter 2033 when the type is a dc-powered traction converter type.

When the traction converter 203 is an ac-powered traction converter, the four-quadrant rectifier 2031 has an input connected to an ac power supply device and an output connected to the input of the dc conversion circuit 2032 and the input of the other dc-side loads 2043 of the load device group 204; the four-quadrant rectifier 2031 comprises an input current sensor and a plurality of rectifying IGBT devices; the input current sensor is used for collecting the input current of the four-quadrant rectifier 2031 and feeding back the collected information to the traction control unit 202; the rectifying IGBT device is configured to receive a control pulse sent from the traction control unit 202, and adjust the four-quadrant rectifier 2031 according to the control pulse to implement 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 dc conversion circuit 2032 is connected to the input end of the traction inverter 2033 and the brake resistor box 2042 of the load device group 204, respectively; the dc conversion circuit 2032 includes an output chopper current sensor and a plurality of chopper IGBT devices; the output chopping current sensor is used for collecting the output chopping current of the direct current conversion circuit 2032 and feeding back the 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 implement an open-loop or closed-loop control mode.

The output end of the traction inverter 2033 is connected to the input end of the traction motor 2041 of the load device group 204; the traction inverter 2033 comprises an output three-phase current sensor and a plurality of inverter IGBT devices; the output three-phase current sensor is used for collecting the output three-phase current of the traction inverter 2033 and feeding back the collected information to the traction control unit 202; the inverting 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 box 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 of the invention, can execute the method steps in the method embodiment, and the implementation principle and the technical effect are similar, so that the detailed description is omitted.

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

Those of skill would further appreciate that the various illustrative components 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 components and steps have been described above generally in terms of their functionality in order to clearly illustrate this 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 implementation. 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, a software module executed by a processor, or a combination of the two. A software module may reside 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 above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (10)

1. A high-voltage on-load self-detection method for a traction converter of a railway vehicle is characterized by comprising the following steps:

receiving first request data sent by a driver;

when the first request data is a test request, judging whether the rail vehicle meets a self-checking condition currently, and generating corresponding first instruction data according to a judgment 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 meets self-checking conditions currently 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, carrying out 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 self-checking processing on the traction converter to generate self-checking report data;

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

2. The rail vehicle traction converter high voltage belt load self-test method according to claim 1,

the traction converter takes a traction motor, a brake resistance 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 type of the traction converter is 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 type of the traction converter is a direct current supply traction converter type, the input end of the direct current conversion circuit is connected with direct current 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 resistance 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 chopping current sensor and a plurality of chopping IGBT devices; the traction inverter comprises an output three-phase current sensor and a plurality of inverter IGBT devices.

3. The method according to claim 1, wherein the step of judging whether the rail vehicle currently meets the self-test condition and generating corresponding first instruction data according to a judgment result comprises the steps of:

judging whether at least one of all current main circuit breakers of the railway vehicle is closed, and if so, setting a first judgment result as a satisfaction;

judgment stationWhether the current speed of the rail vehicle is lower than a preset minimum allowable speed V_minIf yes, setting a second judgment result as satisfied;

judging whether the traction converter is in a fault isolation state currently or not, and if not, setting a third judgment result as a satisfaction;

judging whether the handle position of the current direction of the railway vehicle is in a forward position or a backward position, and if so, setting a fourth judgment result as a satisfaction;

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

4. The method according to claim 2, wherein the step of judging whether the traction converter currently meets a self-test condition to generate corresponding first state data specifically comprises the steps of:

judging whether the current speed of the rail vehicle is lower than a preset minimum allowable speed V or not_minIf yes, setting a fifth judgment result as satisfied;

if the type of the traction converter is the type of an alternating current 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 as a satisfaction;

judging whether the direct current conversion circuit completes pre-charging at present, and if so, setting a seventh judgment result as satisfied;

judging whether the traction inverter is in a non-fault isolation state currently and the inversion IGBT device is not driven to be enabled, if so, setting an eighth judgment result as a satisfaction;

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

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

5. The method according to claim 2, wherein the ac-powered traction converter self-test processing is performed on the traction converter to generate corresponding self-test report data, and specifically comprises:

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

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

when the third self-checking processing is finished, the self-checking state information is switched to a self-checking finished 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, the self-checking state information is switched back to a waiting self-checking state.

6. The method according to claim 2, wherein the self-checking of the traction converter with the high voltage load by the rail vehicle traction converter comprises the following specific steps:

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

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

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

7. The rail vehicle traction converter high-voltage on-load self-test method according to claim 5 or 6, wherein the performing of the first self-test processing on the traction inverter generates corresponding first self-test result data, specifically comprising:

taking the traction motor as a self-checking load;

setting a three-phase current target value I_{s_aim}(ii) a And calculating to obtain the open-loop modulation voltage given value V according to the single-phase equivalent circuit of the traction motor_{S_cons}And open loop modulation frequency set value f_{s_cons}；

According to the three-phase current target value I_{s_aim}And a preset error coefficient T of three-phase current_invCalculating the minimum value I of three-phase current_{s_min}＝I_{s_aim}*(1-T_inv) Maximum value of three-phase current I_{s_max}＝I_{s_aim}*(1+T_inv) (ii) a And with I_{s_min}Is a lower limit of I_{s_max}At an upper limit, constructing a first current range;

controlling the traction motor to be in a rotor locked-rotor state by performing air parking brake operation on the rail vehicle in a static state; and according to the given value V of the open-loop modulation voltage_{S_cons}And the given value f of the open-loop modulation frequency_{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 of the traction inverter in the open-loop control mode exceeds a first preset time m₁Then, feedback information of the output three-phase current sensor is obtainedTo a corresponding first current I_s(ii) a Acquiring fault information of the inverter IGBT device to generate corresponding first fault data;

when the first current I_sWhen the first current range is met and the first fault data is empty, setting the first self-test result data as successful self-test; when the first current I_sThe first current I does not satisfy the first current range or the first fault data is not empty_sThe first observation current range and the first fault data form 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.

8. The method according to claim 5 or 6, wherein the second self-test processing is performed on the DC conversion circuit to generate corresponding second self-test result data, and specifically comprises:

taking the brake resistor box as a self-checking load; the direct current conversion circuit is controlled to enter an open-loop control mode by sending control pulses to the chopping IGBT device of the direct current conversion circuit, and the duty ratio of the direct current conversion circuit is a set duty ratio K_cons；

According to the set duty ratio K_consAnd a predetermined input voltage V of the DC converter circuit_dcResistance value R of brake resistor box_chopCurrent error coefficient of chopping T_chopCalculating the minimum value I of the chopping current_{chop_min}＝V_dc*(1-T_chop)*K_cons/R_chopMaximum value of chopping current I_{chop_max}＝V_dc*(1+T_chop)*K_cons/R_chop(ii) a And with I_{chop_min}Is the lower limit, I_{chop_max}At the upper limit, a second current range is constructed;

when the continuous working time of the direct current conversion circuit in the open loop control mode exceeds a second preset time m₂Then, the feedback information of the output chopping current sensor is obtained to generate a corresponding secondTwo currents I_chop(ii) a Acquiring fault information of the chopping IGBT device to generate corresponding second fault data;

when the second current I_chopWhen the second current range is met and the second fault data is empty, setting the second self-test result data as successful self-test; when the second current I_chopThe second current I does not satisfy the second current range or the second fault data is not empty_chopThe second current range and the second fault data form second self-test 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.

9. The method for self-checking a traction converter of a railway vehicle with a high voltage load according to claim 5, wherein the third self-checking process is performed on the four-quadrant rectifier to generate corresponding third self-checking result data, and specifically comprises:

taking the brake resistance 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 pulses to the rectification IGBT device of the four-quadrant rectifier, so that the four-quadrant rectifier works in a load state; and controlling the direct current conversion circuit to enter an open-loop control mode by sending control pulses to the chopped IGBT device of the direct current conversion circuit, wherein the duty ratio of the direct current conversion circuit is a set 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_chopFor the power consumption of the DC converter circuit, P_{Aux_max}Is the maximum power, N, of the other DC-side loads_4QCThe number of parallel rectifier modules of the four-quadrant rectifier, V_ACIs the input supply voltage of 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 m₃Then, the feedback information of the input current sensor is obtained to generate a corresponding third current I_4QC(ii) a Acquiring fault information of the rectification IGBT device to generate corresponding third fault data;

when the third current I is_4QCWhen the third current range is met and the third fault data is empty, setting the third self-checking result data as successful self-checking; when the third current I_4QCThe third current I is used when the third current range is not satisfied or the third fault data is not empty_4QCThe third current range and the third fault data constitute the third self-test result data;

and after the third self-checking result data are obtained, 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.

10. A system for implementing a high voltage on-load self-test method for a railway vehicle traction converter according to any one of claims 1 to 9, the system comprising: the system comprises a human-computer interface unit, a traction control unit, a traction converter and a load equipment set;

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 rail vehicle meets a self-checking condition currently, and generating corresponding first instruction data according to a judgment result; sending the first instruction data to the traction control unit through the communication interface; receiving self-checking report data sent back from the traction control unit and sending the report data back 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, identifying the first instruction data; if the first instruction data is a self-checking starting instruction, judging whether the traction converter meets self-checking conditions currently 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, carrying out self-checking processing on the traction converter by the alternating current power supply 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 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 type of the traction converter is 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 the 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 a control pulse sent by the traction control unit and adjusting the four-quadrant rectifier to realize 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 supply equipment when the type of the traction converter is a direct current 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 brake resistance box of the load equipment group; the direct current conversion circuit comprises an output chopping current sensor and a plurality of chopping IGBT devices; the output chopping current sensor is used for collecting the output chopping current of the direct current conversion circuit and feeding back the collected information to the traction control unit; the chopping IGBT device is used for receiving the control pulse sent by the traction control unit and adjusting the direct current conversion circuit to realize an open-loop or closed-loop control mode according to the control pulse;

the output end of the traction inverter is connected with the input end of a 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 the output three-phase current of the traction inverter and feeding back the collected information to the traction control unit; the inversion IGBT device is used for receiving the control pulse sent by the traction control unit and adjusting the traction inverter to enter an open-loop or closed-loop control mode according to the control pulse;

the load equipment group comprises the other direct current side loads, the brake resistance box and the traction motor.

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