CN111766534A - Traction converter ground fault detection method and device - Google Patents

Traction converter ground fault detection method and device Download PDF

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Publication number
CN111766534A
CN111766534A CN202010509496.0A CN202010509496A CN111766534A CN 111766534 A CN111766534 A CN 111766534A CN 202010509496 A CN202010509496 A CN 202010509496A CN 111766534 A CN111766534 A CN 111766534A
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pulse
ground fault
quadrant
voltage
output
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CN111766534B (en
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苏鹏程
王龙刚
于森林
张瑞峰
詹哲军
贺志学
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CRRC Yongji Electric Co Ltd
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CRRC Yongji Electric Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/005—Testing of electric installations on transport means
    • G01R31/008—Testing of electric installations on transport means on air- or spacecraft, railway rolling stock or sea-going vessels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
    • B60L3/0069—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to the isolation, e.g. ground fault or leak current
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
    • B60L50/51—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells characterised by AC-motors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L9/00—Electric propulsion with power supply external to the vehicle
    • B60L9/16—Electric propulsion with power supply external to the vehicle using ac induction motors
    • B60L9/24—Electric propulsion with power supply external to the vehicle using ac induction motors fed from ac supply lines
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/52—Testing for short-circuits, leakage current or ground faults
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/56—Testing of electric apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
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    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
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Abstract

The invention relates to traction converter ground fault detection, in particular to a traction converter ground fault detection method and device. The method solves the problems of the existing traction converter ground fault detection method. The detection method can detect various ground faults on line in real time without stopping and complex detection logic, and can distinguish the input ground fault end of the four-quadrant rectifier and the ground fault end of the inverter U, V, W. The detection device provided by the invention fully utilizes inherent resources on the locomotive, and the detection circuit can be built only by additionally adding part of detection board cards. The ground fault detection device for traction converter comprises a DC bus voltage acquisition unitdcThe sensor TV1 collects the voltage U of the negative end of the direct current bus to the groundgndSensor TV 2; the system also comprises a voltage comparator, a direct current bus positive and negative earth fault judgment module, a trigger, a divider, a switch control module, a filtering processing module, a multiplier, an integrator and a four-quadrant inversion earth faultAnd a judging module.

Description

Traction converter ground fault detection method and device
Technical Field
The invention relates to traction converter ground fault detection, in particular to a traction converter ground fault detection method and device.
Background
The traction converter is used as a core component of a train electric transmission system, the high reliability of the traction converter is an important guarantee for the safe and stable operation of a train, the ground fault is the most frequent fault in various faults of the traction converter, generally, a single-point ground fault cannot influence the operation of the converter, but when a two-point or multi-point ground fault occurs, a short-circuit fault can be caused, the serious damage of the train traction system can be further caused, and even the personal safety of passengers can be threatened. Therefore, when the traction converter is grounded at a single point, how to quickly and accurately detect the grounding point in an on-line state without stopping the traction converter is very critical, and further, the occurrence of two-point or multi-point grounding faults is avoided.
The method can quickly detect the positive and negative ground faults of the direct current bus, but the output of an inverter and the input ground faults of a four-quadrant rectifier are not easy to distinguish, complex logic judgment is needed, and shutdown processing is possibly needed; on the other hand, the input ground fault end of the four-quadrant rectifier cannot be distinguished only by the ground voltage, and the ground fault end connected with the inverter U, V, W cannot be distinguished.
Disclosure of Invention
The invention solves the problems of the existing traction converter ground fault detection method and provides a traction converter ground fault detection method and a device, the detection method can detect various ground faults on line in real time without stopping and complex detection logic, and can distinguish the input ground fault end of a four-quadrant rectifier and the ground fault end of an inverter U, V, W. The detection device fully utilizes inherent resources on the locomotive, and the detection circuit can be built only by additionally adding part of detection board cards.
The invention is realized by adopting the following technical scheme: the method for detecting the ground fault of the traction converter is realized by the following steps:
(1) collecting DC bus voltage Udc(ii) a Collecting voltage U of negative end to ground of direct current busgnd；
(2)UdcAnd UgndComparing with an input voltage comparator, wherein the voltage comparator internally comprises a timer which controls the period TctlFor n power frequency periods TfN can be an empirical value of 5-9 (the larger the n is, the higher the accuracy is, but the real-time performance is considered, the n cannot be too large);
Figure BDA0002527708040000021
Tctl＝n*Tf(n is a positive integer, 5. ltoreq. n.ltoreq.9)
Wherein: f is the standard network voltage frequency of 50 Hz;
according to UdcAnd UgndThe following judgment is made:
case 1: at a TctlIn the period of time, the number of the first and second electrodes,
Figure BDA0002527708040000022
the work is normal and has no fault;
case 2: at a TctlWithin a period, Ugnd＝Udc(ii) a The abnormal work refers to the positive grounding fault of the direct current bus;
case 3: at a TctlWithin a period, U gnd0; the abnormal work is a negative earth fault of the direct current bus;
case 4: at a TctlWithin a period, UgndAt 0 and UdcAlternate between; working abnormity, namely a four-quadrant rectifier ground fault or an inverter ground fault, to be further judged;
(3) acquiring modulation pulse signals of a four-quadrant rectifier and an inverter: the system comprises a four-quadrant A bridge arm top tube pulse g _ AH, a four-quadrant B bridge arm top tube pulse g _ BH, an inversion U bridge arm top tube pulse g _ UH, an inversion V bridge arm top tube pulse g _ VH and an inversion W bridge arm top tube pulse g _ WH;
(4) the filtering circuit filters the modulation pulse signal, the filtering circuit sets a threshold according to the pulse amplitude, and the thresholds of g _ AH and g _ BH are a;
Figure BDA0002527708040000023
wherein V1Voltage amplitude of high level of four-quadrant modulation pulse;
when the pulse amplitudes of g _ AH and g _ BH are larger than or equal to a, outputting 1, and when the pulse amplitudes are smaller than a, outputting 0; g _ UH, g _ VH and g _ WH thresholds are b;
Figure BDA0002527708040000024
wherein V2The voltage amplitude of the high level of the inversion modulation pulse is obtained;
when the pulse amplitudes of g _ UH, g _ VH and g _ WH are more than or equal to b, 1 is output, when the pulse amplitudes are less than b, 0 is output, and the filtering result of g _ AH and g _ BH is recorded as UnThe results of the filtering of g _ UH, g _ VH and g _ WH are denoted as UmThe calculation formula is as follows:
Figure BDA0002527708040000025
Figure BDA0002527708040000031
(5) the following calculations were performed:
Figure BDA0002527708040000032
Figure BDA0002527708040000033
(6) and judging according to the calculation result as follows:
case 4.1: max (S)1，S2，S3，S4，S5)＝S1At this time, the four-quadrant rectifier is positively grounded;
case 4.2: max (S)1，S2，S3，S4，S5)＝S2At this time, the four-quadrant rectifier is grounded negatively;
case 4.3: max (S)1，S2，S3，S4，S5)＝S3At this time, the U phase of the inverter is reported to be grounded;
case 4.4: max (S)1，S2，S3，S4，S5)＝S4At this time, the inverter V phase is grounded;
case 4.5: max (S)1，S2，S3，S4，S5)＝S5At this time, the inverter W phase is grounded.
The ground fault detection device for traction converter comprises a DC bus voltage acquisition unitdcThe sensor TV1 collects the voltage U of the negative end of the direct current bus to the groundgndSensor TV 2; the direct-current bus positive and negative ground fault detection circuit also comprises a voltage comparator, a direct-current bus positive and negative ground fault judgment module, a trigger, a divider, a switch control module, a filtering processing module, a multiplier, an integrator and a four-quadrant inversion ground fault judgment module;
the voltage comparator contains a timer inside, and the timer controls the period TctlFor n power frequency periods TfN can be an empirical value of 5-9;
Figure BDA0002527708040000034
Tctl＝n*Tf(n is a positive integer, 5. ltoreq. n.ltoreq.9)
Wherein: f is the standard network voltage frequency of 50 Hz;
u collected by TV1dcSignal and TV2 acquired UgndThe signal is sent into a voltage comparator, one output end of the voltage comparator is connected with the input end of a trigger, the other output end of the voltage comparator is connected with a positive and negative grounding fault judgment module of a direct current bus, and the output end of the trigger is connected with the control end of a switch control module; u collected by TV1dcSignal and TV2 acquired UgndThe signal is fed to a divider and divided by Ugnd/UdcAs the output of the divider;
the power-on pulse g _ AH on a four-quadrant A bridge arm, the power-on pulse g _ BH on a four-quadrant B bridge arm, the power-on pulse g _ UH on an inversion U bridge arm, the power-on pulse g _ VH on an inversion V bridge arm and the power-on pulse g _ WH on an inversion W bridge arm are sent to the input end of the filtering processing module; setting a threshold value in the filtering processing module: the threshold values of g _ AH and g _ BH are a, when the pulse amplitude of g _ AH and g _ BH is larger than or equal to a, 1 is output, and when the pulse amplitude is smaller than a, 0 is output; the g _ UH, g _ VH and g _ WH thresholds are b, 1 is output when the pulse amplitudes of the g _ UH, g _ VH and g _ WH are more than or equal to b, and 0 is output when the pulse amplitudes are less than b;
the control end of the switch control module is controlled by the output end of the trigger, so that each switch in the switch control module is switched on and off; the output signal of the divider and the output signal of the filtering processing module are sent to the multiplier through a switch in the switch control module, the output end of the multiplier is connected with the input end of the integrator, and the output end of the integrator is connected with the four-quadrant inversion grounding fault judgment module.
The detection method provided by the invention has the advantages that the algorithm is simple and effective, the four-quadrant and inversion grounding faults can be distinguished without complex control logic, and meanwhile, the positive and negative grounding faults of the four-quadrant rectifier and the grounding fault of the inverter U, V, W can be distinguished. The fault can be detected on line in real time, and the occurrence of shutdown events is avoided. The invention makes full use of the inherent components of the TCU and can quickly build a detection device.
Drawings
FIG. 1 is a traction converter electrical loop topology;
FIG. 2 is a block diagram of the ground fault detection apparatus of the present invention;
fig. 3 is a schematic diagram of the four-quadrant and inverter ground fault detection method of the present invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
The electrical main circuit of the traction converter is shown in fig. 1; the main components are as follows: the device comprises a rated input 25KV50Hz transformer, a pre-charging module, a four-quadrant rectifier, a middle direct current loop, a ground detection module and an inversion module.
The pre-charging module comprises a pre-charging contactor K1 and a main working contactor K2; the four-quadrant rectifier comprises two bridge arms: the transformer comprises an A bridge arm and a B bridge arm, wherein the total number of the switch tubes is 4 (AH, AB, BH and BB), and a secondary side of the transformer is connected with a four-quadrant rectifier A, B bridge arm through two leads; the middle direct current loop comprises a direct current side supporting capacitor C1, a direct current bus voltage sensor TV1 and a grounding detection module; the grounding detection module comprises a capacitor C2, series resistors R2 and R3, wherein the resistance values of R2 and R3 are equal, and a grounding voltage sensor TV 2; the inversion module comprises three bridge arms: the three bridge arms are connected with the three-phase alternating current motor through three leads.
The grounding point of the traction converter, which is easy to have ground fault, is as follows: four-quadrant input positive and negative ends (points a and b), direct-current bus positive and negative ends (points c and d), and inverter output U, V, W ends (points e, f and g).
The ground fault detection arrangement is shown in figure 2.
The network voltage transformer collects the pantograph-catenary voltage, the pantograph-catenary voltage is subjected to analog-to-digital conversion and filtering processing and then is input into the current transformation control and modulation module, and the network voltage amplitude and phase are calculated according to the collected network voltage and are applied to four-quadrant rectification control and modulation;
the four-quadrant and inverter current sensor collects four-quadrant input current and inverter output current, and the four-quadrant and inverter output current is input to a variable current control and modulation module through analog-to-digital conversion and filtering processing and is respectively applied to four-quadrant rectification and inverter control and modulation;
the motor speed sensor acquires the motor rotating speed in real time, and the motor rotating speed is input to the current transformation control and modulation module through analog-to-digital conversion and filtering processing and is applied to inverter control and modulation;
the intermediate bus voltage sensor collects intermediate direct current bus voltage, and the intermediate direct current bus voltage is input to the variable current control and modulation module on the one hand through analog-to-digital conversion and filtering processing; on the other hand, the voltage is input into a voltage comparator and a divider;
the method comprises the following steps that a grounding voltage sensor collects grounding voltage, the grounding voltage is input to a voltage comparator through analog-to-digital conversion and then is input to a switch control module through filtering processing, and the divider is used for dividing the grounding voltage and the direct-current bus voltage;
the current transformation control and modulation module carries out four-quadrant and inversion control and modulation on an electric signal input by an external sensor to finally generate a four-quadrant converter modulation pulse and an inverter modulation pulse;
the modulation pulse generation and the previous steps can be completed by a converter control core unit TCU, and the part can be directly used;
on one hand, the modulation pulse is amplified and input to a driving electrode (IGBT) of each bridge arm switching tube to control the switching action of the device; on the other hand, after special filtering processing, the data are input into the switch control module;
the voltage comparator contains a timer inside, and the timer controls the period TctlFor n power frequency periods TfThe value of n can be set according to actual conditions;
Figure BDA0002527708040000051
Tctl＝n*Tf(n is a positive integer, 5. ltoreq. n.ltoreq.9)
Wherein: f is the standard network voltage frequency of 50 Hz;
the voltage comparator outputs a control signal to the trigger on one hand and distinguishes positive and negative ground faults of the direct-current bus according to a voltage comparison result on the other hand by comparing the relation between the voltage of the direct-current bus and the ground voltage;
the relationship between the dc bus voltage and the ground voltage is divided into the following cases:
case 1: at a TctlIn the period of time, the number of the first and second electrodes,
Figure BDA0002527708040000061
case 1 conclusion: the work is normal and has no fault;
case 2: at a TctlWithin a period, Ugnd＝Udc；
Case 3: at a TctlWithin a period, Ugnd＝0；
Case 4: at a TctlGround voltage values of 0 and U during the perioddcAlternate between;
after the event of the condition 2 or the condition 3 occurs, the voltage comparator outputs a flag bit to the positive and negative grounding fault judgment module of the direct current bus, and the judgment result is as follows:
case 2 conclusion: the abnormal work refers to the positive grounding fault of the direct current bus;
case 3 conclusion: the abnormal work is a negative earth fault of the direct current bus;
after the event of the condition 4 occurs, the voltage comparator outputs a flag bit to the trigger, and the preliminary judgment result is as follows:
case 4 conclusion: working abnormity, four-quadrant ground fault or inversion ground fault, and further judgment is needed;
and after the condition 4 event occurs, the switch control module triggers the internal switch to be closed according to the control signal sent by the trigger. The internal switch gating divider outputs a signal and a modulation pulse signal;
the four quadrant and inverter ground fault detection method is shown in fig. 3;
the modulation pulses are divided into two types, and the modulation pulses totally comprise 5 paths of pulses, which are respectively as follows: the power supply control module comprises a four-quadrant A bridge arm power supply pulse g _ AH, a four-quadrant B bridge arm power supply pulse g _ BH, an inversion U bridge arm power supply pulse g _ UH, an inversion V bridge arm power supply pulse g _ VH and an inversion W bridge arm power supply pulse g _ WH, wherein 5 paths of pulses are respectively input into a filtering processing module;
the filtering processing module sets a reasonable threshold according to the pulse amplitude, the output of the threshold is 1 when the pulse amplitude is larger than or equal to the threshold, the output of the threshold is 0 when the pulse amplitude is smaller than the threshold, the threshold of the four-quadrant two-path pulse is set as a, 1 is output when the pulse amplitude is larger than or equal to a, and 0 is output when the pulse amplitude is smaller than a; setting a threshold value b for three inverted pulses, outputting 1 when the pulse amplitude is greater than or equal to b, outputting 0 when the pulse amplitude is less than b, and recording the four-quadrant two-path upper bridge arm pulse filtering result as UnAnd the pulse filtering result of the inverted three-path upper bridge arm is recorded as UmThe calculation formula is as follows:
Figure BDA0002527708040000062
wherein V1Voltage amplitude of high level of four-quadrant modulation pulse;
Figure BDA0002527708040000071
Figure BDA0002527708040000072
wherein V2The voltage amplitude of the high level of the inversion modulation pulse is obtained;
Figure BDA0002527708040000073
multiplying the ratio of the grounding voltage to the DC bus voltage by each path of filtered pulse, performing integral operation on the product result in a control period, and recording the four-quadrant integral result as SnAnd the inversion integration result is recorded as SmThe formula is as follows:
Figure BDA0002527708040000074
Figure BDA0002527708040000075
wherein: t isctlControlling the period for a timer
Finally, according to the integral calculation result of each path of pulse, the maximum value is obtained to judge the type of the ground fault;
case 1: maximum value max (S)1，S2，S3，S4，S5)＝S1At this time, the four quadrants are reported to be positively grounded;
case 2: maximum value max (S)1，S2，S3，S4，S5)＝S2Then reporting four-quadrant negative grounding;
case 3: maximum value max (S)1，S2，S3，S4，S5)＝S3At the moment, the inversion U phase is grounded;
case 4: maximum value max (S)1，S2，S3，S4，S5)＝S4At this moment, the inversion V phase is grounded;
case 5: maximum value max (S)1，S2，S3，S4，S5)＝S5At this time, the inversion W phase is grounded.

Claims (3)

1. A method for detecting ground fault of a traction converter is characterized by comprising the following steps:
(1) collecting DC bus voltage Udc(ii) a Collecting voltage U of negative end to ground of direct current busgnd；
(2)UdcAnd UgndComparing with an input voltage comparator, wherein the voltage comparator internally comprises a timer which controls the period TctlFor n power frequency periods TfN is 5-9 of the empirical value;
Figure FDA0002527708030000011
Tctl＝n*Tfn is a positive integer, n is not less than 5 and not more than 9
Wherein: f is the standard network voltage frequency of 50 Hz; according to UdcAnd UgndThe following judgment is made:
case 1: at a TctlIn the period of time, the number of the first and second electrodes,
Figure FDA0002527708030000012
the work is normal and has no fault;
case 2: at a TctlWithin a period, Ugnd＝Udc(ii) a The abnormal work refers to the positive grounding fault of the direct current bus;
case 3: at a TctlWithin a period, Ugnd0; the abnormal work is a negative earth fault of the direct current bus;
case 4: at a TctlWithin a period, UgndAt 0 and UdcAlternate between; working abnormity, namely a four-quadrant rectifier ground fault or an inverter ground fault, to be further judged;
(3) acquiring modulation pulse signals of a four-quadrant rectifier and an inverter: the system comprises a four-quadrant A bridge arm top tube pulse g _ AH, a four-quadrant B bridge arm top tube pulse g _ BH, an inversion U bridge arm top tube pulse g _ UH, an inversion V bridge arm top tube pulse g _ VH and an inversion W bridge arm top tube pulse g _ WH;
(4) the filtering circuit filters the modulation pulse signal, a threshold value is set by the filtering circuit according to the magnitude of the pulse amplitude, the threshold values of g _ AH and g _ BH are a, when the pulse amplitudes of g _ AH and g _ BH are larger than or equal to a, 1 is output, and when the pulse amplitudes are smaller than a, 0 is output; g _ UH, g _ VH and g _ WH have threshold value of b, 1 is output when the pulse amplitude of g _ UH, g _ VH and g _ WH is greater than or equal to b, 0 is output when the pulse amplitude is less than b, and the filtering result of g _ AH and g _ BH is recorded as UnThe results of the filtering of g _ UH, g _ VH and g _ WH are denoted as UmThe calculation formula is as follows:
Figure FDA0002527708030000013
wherein V1Voltage amplitude of high level of four-quadrant modulation pulse;
Figure FDA0002527708030000021
Figure FDA0002527708030000022
wherein V2The voltage amplitude of the high level of the inversion modulation pulse is obtained;
Figure FDA0002527708030000023
(5) the following calculations were performed:
Figure FDA0002527708030000024
Figure FDA0002527708030000025
(6) and judging according to the calculation result as follows:
case 4.1: max (S)1，S2，S3，S4，S5)＝S1At this time, the four-quadrant rectifier is positively grounded;
case 4.2: max (S)1，S2，S3，S4，S5)＝S2At this time, the four-quadrant rectifier is grounded negatively;
case 4.3: max (S)1，S2，S3，S4，S5)＝S3At this time, the U phase of the inverter is reported to be grounded;
case 4.4: max (S)1，S2，S3，S4，S5)＝S4At this time, the inverter V phase is grounded;
case 4.5: max (S)1，S2，S3，S4，S5)＝S5At this time, the inverter W phase is grounded.
2. Traction converter ground fault detection device implementing the detection method according to claim 1, comprising the acquisition of the dc bus voltage UdcThe sensor TV1 collects the voltage U of the negative end of the direct current bus to the groundgndSensor TV 2; the direct-current bus direct-current inverter ground fault detection circuit is characterized by further comprising a voltage comparator, a direct-current bus positive and negative ground fault judgment module, a trigger, a divider, a switch control module, a filtering processing module, a multiplier, an integrator and a four-quadrant inverter ground fault judgment module;
the voltage comparator contains a timer inside, and the timer controls the period TctlFor n power frequency periods TfN is 5-9 of the empirical value;
Figure FDA0002527708030000026
Tctl＝n*Tfn is a positive integer, n is not less than 5 and not more than 9
Wherein: f is the standard network voltage frequency of 50 Hz;
u collected by TV1dcSignal and TV2 acquired UgndThe signal is sent into a voltage comparator, one output end of the voltage comparator is connected with the input end of a trigger, the other output end of the voltage comparator is connected with a positive and negative grounding fault judgment module of a direct current bus, and the output end of the trigger is connected with the control end of a switch control module; u collected by TV1dcSignal and TV2 acquired UgndThe signal is fed to a divider and divided by Ugnd/UdcAs the output of the divider;
the power-on pulse g _ AH on a four-quadrant A bridge arm, the power-on pulse g _ BH on a four-quadrant B bridge arm, the power-on pulse g _ UH on an inversion U bridge arm, the power-on pulse g _ VH on an inversion V bridge arm and the power-on pulse g _ WH on an inversion W bridge arm are sent to the input end of the filtering processing module; setting a threshold value in the filtering processing module: the threshold values of g _ AH and g _ BH are a, when the pulse amplitude of g _ AH and g _ BH is larger than or equal to a, 1 is output, and when the pulse amplitude is smaller than a, 0 is output; the g _ UH, g _ VH and g _ WH thresholds are b, 1 is output when the pulse amplitudes of the g _ UH, g _ VH and g _ WH are more than or equal to b, and 0 is output when the pulse amplitudes are less than b;
the control end of the switch control module is controlled by the output end of the trigger, so that each switch in the switch control module is switched on and off; the output signal of the divider and the output signal of the filtering processing module are sent to the multiplier through a switch in the switch control module, the output end of the multiplier is connected with the input end of the integrator, and the output end of the integrator is connected with the four-quadrant inversion grounding fault judgment module.
3. The traction converter ground fault detection device of claim 2, wherein the U collected by TV1dcSignal and TV2 acquired UgndThe signals are processed by analog-to-digital conversion and filtering, and then sent to a voltage comparator and a filter respectivelyA French machine.
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