CN110794327A - Grounding point judgment method for rectifier and inverter of HXD2 electric locomotive - Google Patents
Grounding point judgment method for rectifier and inverter of HXD2 electric locomotive Download PDFInfo
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- CN110794327A CN110794327A CN201911038651.9A CN201911038651A CN110794327A CN 110794327 A CN110794327 A CN 110794327A CN 201911038651 A CN201911038651 A CN 201911038651A CN 110794327 A CN110794327 A CN 110794327A
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Abstract
The invention relates to a method for judging grounding points of traction converters of electric locomotives, in particular to a method for judging grounding points of a rectifier and an inverter of an HXD2 type electric locomotive. The existing method for judging the grounding point of the converter is not suitable for solving the problem of HXD2 type electric locomotives. According to the judging method, when any one end of single-phase alternating current input of a rectifier or any one phase of three-phase output of an inverter is subjected to single-point grounding, voltage Ug at two ends of a second resistor R2 jumps between Udc and 0; when the inverter works in a 15-frequency division or 12-frequency division modulation range, judging that the inverter is grounded when the number of the pulses of the Ug in one week is more than or equal to 10, and judging that the rectifier is grounded when the number of the pulses of the Ug in one week is less than 10; when the inverter works in other modulation ranges, when the Ug frequency is larger than or equal to 400Hz, the rectifier is judged to be grounded, and when the Ug frequency is smaller than 400Hz, the inverter is judged to be grounded.
Description
Technical Field
The invention relates to a method for judging grounding points of traction converters of electric locomotives, in particular to a method for judging grounding points of a rectifier and an inverter of an HXD2 type electric locomotive.
Background
After the electric locomotive is operated on line for a period of time, the converter loop grounding is possibly caused by the aging of internal lines of the traction converter and the insulation damage caused by the vibration and friction of parts, so that the locomotive converter grounding fault is frequent. In the actual operation of the locomotive, after single-point grounding occurs on the rectifier input, the middle direct current bus and the inverter output of the converter, although the normal operation of the converter is not influenced, if fault troubleshooting is not carried out in time, a main loop short circuit is formed when two-point or multi-point grounding occurs, and the damage of converter devices is caused seriously, so that a larger fault is caused. Therefore, when the traction converter is grounded in a single point, the grounding point of the converter can be accurately judged in time on the premise of not influencing the normal operation of the locomotive.
Disclosure of Invention
The invention solves the problem that the existing method for judging the grounding point of the converter is not suitable for an HXD2 electric locomotive, and provides a method for judging the grounding point of a rectifier and an inverter of an HXD2 electric locomotive.
The invention is realized by adopting the following technical scheme: a method for judging grounding points of a rectifier and an inverter of an HXD2 electric locomotive comprises the steps that the rectifier comprises T1, T2, T3 and T4 switching tubes, the inverter comprises T5, T6, T7, T8, T9 and T10 switching tubes, a first resistor R1 and a second resistor R2 are connected between the positive and the negative of a middle direct-current bus in series, the connection midpoint of the first resistor R1 and the second resistor R2 is connected with the ground, and a first voltage sensor TV1 collects the voltage Udc of the middle direct-current bus in real time; the second voltage sensor TV2 collects the voltage Ug at two ends of the second resistor R2 in real time;
recording the waveform of the Ug, and judging that grounding occurs when the Ug jumps between Udc and 0;
calculating each pulse width of the Ug waveform, and determining the change period and frequency of the Ug according to the periodic change trend of the pulse width;
judging whether the modulation mode of the current inverter is frequency division of 15 or 12, if so, judging that the inverter is grounded when the number of the pulses of the Ug in one week is more than or equal to 10, and judging that the rectifier is grounded when the number of the pulses of the Ug in one week is less than 10; if not (working at 15-frequency division or 12-frequency division), when the Ug frequency is larger than or equal to 400Hz, the rectifier is grounded, and when the Ug frequency is smaller than 400Hz, the inverter is grounded.
Further, when the rectifier is grounded, the change of the Ug is consistent with the change of the gate pulse of the T1 switching tube (i.e. gate pulse exists, Ug is Udc, no gate pulse exists, and Ug is zero), and the input 1 end (fire wire end) of the rectifier is judged to be grounded; the change of the Ug is consistent with the change of a gate pulse of a T3 switching tube, and the input 2 end (zero line end) of the rectifier is judged to be grounded; when the inverter is grounded, the change of the Ug is consistent with the change of a gate pulse of a T5 switching tube, and the output 3 end (phase A) of the inverter is judged to be grounded; the change of the Ug is consistent with the change of a gate pulse of a T7 switching tube, and the output 4 end (B phase) of the inverter is judged to be grounded; the change of the Ug is consistent with the change of a gate pulse of a T9 switching tube, and the output 5 end (C phase) of the inverter is judged to be grounded.
When the traction converter is grounded at a single point, the method for judging the grounding points of the rectifier and the inverter of the HXD2 type electric locomotive can accurately judge and distinguish the grounding points of the converter in time.
Drawings
Fig. 1 is a drawing converter topology structure diagram;
FIG. 2 is a graph of the variation of the inverter switching frequency;
FIG. 3 is a graph of the Ug waveform when the inverter ground is divided by 15;
fig. 4 is a Ug waveform diagram when the inverter ground 12 is divided;
fig. 5 is a waveform diagram of Ug when the rectifier is grounded.
Detailed Description
As shown in fig. 1, in a typical traction converter topology of an electric locomotive, a rectifier is composed of T1, T2, T3 and T4 switching tubes, and an inverter is composed of T5, T6, T7, T8, T9 and T10 switching tubes. Wherein Cd is a middle supporting capacitor, TV1 is a first voltage sensor for collecting middle DC bus voltage, TV2 is a second voltage sensor, Gnd is a grounding point, and M represents a motor driven by an inverter. The grounding detection circuit of the converter adopts a floating point grounding mode of an intermediate loop. In fig. 1, the rectifier inputs may be grounded at 1, 2 and the inverter may be grounded at 3, 4, 5.
The grounding detection circuit is characterized in that a first resistor R1 and a second resistor R2 are connected in series between the positive pole and the negative pole of the intermediate direct current bus, and the connection middle point of the two resistors is connected with the ground. Wherein the TV1 collects the intermediate dc bus voltage Udc; the TV2 collects the voltage Ug (also called ground voltage) across the second resistor R2. The Ug voltage is:
and the inverter controller acquires the voltage value of the Ug in real time and distinguishes the grounding of the rectifier and the inverter according to the grounding voltage value.
When the input end of the rectifier is grounded, the positions of the 1 point and the 2 point in the figure 1 are corresponded. When T1 is turned on and T2 is turned off in the rectifier, both ends of R1 are grounded, the voltage of R1 is 0, and the voltage Ug = Udc across R2; when T1 is off and T2 is on, both ends of R2 are grounded, so Ug = 0. Therefore, after the point 1 is grounded, the change of the grounding voltage Ug is consistent with the change trend of the gate pulse of T1, and the voltage value jumps between Udc and 0. Also, when point 2 is grounded, the change in ground voltage is consistent with the change in gate pulse of T3.
When the output end of the inverter is grounded, the positions of 3, 4 and 5 points in the figure 1 are corresponded. When the point 3 is grounded, when the inverter is internally turned on by T5 and turned off by T6, both ends of R1 are grounded, the voltage across R1 is 0, and the voltage across R2 Ug = Udc; when T5 is off and T6 is on, both ends of R2 are grounded, so Ug = 0. Therefore, after the 3-point grounding, the change of the grounding voltage Ug is consistent with the change of the T5 pulse, and the voltage value also jumps between Udc and 0. Similarly, when the 4-point grounding is performed, the change of the grounding voltage is consistent with the change of the gate pulse of T7; when point 5 is grounded, the change in ground voltage is consistent with the change in gate pulse of T9.
According to the above, when the single-point grounding occurs at the input of the rectifier or the output of the inverter, the grounding voltage value jumps between Udc and 0. For the rectifier control, the input power frequency is a fixed frequency of 50Hz, the carrier ratio of the rectifier control is a constant, here, for example, HXD2 electric locomotive, the carrier ratio is 9, and the switching frequency of the rectifier control is 450 Hz. The inverter is controlled by voltage transformation and frequency conversion, three parts of asynchronous modulation, synchronous modulation (15 frequency division, 12 frequency division, 7 frequency division and 3 frequency division) and square wave modulation are divided in a full speed range, and the change of switching frequency in the full range is controlled by the inverter as shown in figure 2. In the figure, N denotes a frequency division number.
As can be seen from fig. 2, the inverter switching frequency ranges from 60-480 Hz. When the inverter works in synchronous 15 frequency division and synchronous 12 frequency division, the switching frequency is 360-480 Hz; when the inverter works in asynchronous modulation, synchronous modulation frequency division of 7, synchronous modulation frequency division of 3 and square wave modulation, the switching frequency range is 60-385 Hz. Thus, the rectifier ground and the inverter ground are distinguished in two parts.
When the inverter is grounded and works in a frequency division range of 15, the waveform of the ground voltage is divided by 15 frequency pulses, as shown in figure 3, and the number of pulses in one period is 15; when the inverter is grounded and works in a frequency division range of 12, the waveform of the ground voltage is shown in figure 4, and the number of pulses in one period is 12; when the rectifier is grounded, the carrier ratio of the rectifier is fixed to 9, the number of pulses in one period is 9, and the waveform of the ground voltage of the rectifier is shown in fig. 5. Therefore, when the inverter operates at the frequency division of 15 and 12, the rectifier and the inverter can be distinguished from each other according to the number of pulses of the ground voltage Ug within one cycle. And when the number of pulses in one cycle is more than or equal to 10, judging that the inverter is grounded, and when the number of pulses is less than 10, judging that the rectifier is grounded.
And when the inverter works in other modulation ranges, calculating the waveform change frequency of the grounding voltage Ug. Taking 400Hz as a standard, and when the frequency of the grounding voltage is more than or equal to 400Hz, judging that the rectifier is grounded; otherwise, the inverter is grounded.
Claims (2)
1. A method for judging grounding points of a rectifier and an inverter of an HXD2 electric locomotive comprises the steps that the rectifier comprises T1, T2, T3 and T4 switching tubes, the inverter comprises T5, T6, T7, T8, T9 and T10 switching tubes, a first resistor R1 and a second resistor R2 are connected between the positive and the negative of a middle direct-current bus in series, the connection midpoint of the first resistor R1 and the second resistor R2 is connected with the ground, and a first voltage sensor TV1 collects the voltage Udc of the middle direct-current bus in real time; the second voltage sensor TV2 collects the voltage Ug at two ends of the second resistor R2 in real time; the method is characterized in that:
recording the waveform of the Ug, and judging that grounding occurs when the Ug jumps between Udc and 0;
calculating each pulse width of the Ug waveform, and determining the change period and frequency of the Ug according to the periodic change trend of the pulse width;
judging whether the modulation mode of the current inverter is frequency division of 15 or 12, if so, judging that the inverter is grounded when the number of the pulses of the Ug in one week is more than or equal to 10, and judging that the rectifier is grounded when the number of the pulses of the Ug in one week is less than 10; if not, when the Ug frequency is larger than or equal to 400Hz, the rectifier is judged to be grounded, and when the Ug frequency is smaller than 400Hz, the inverter is judged to be grounded.
2. The method for determining HXD2 type electric locomotive rectifier and inverter grounding point according to claim 1, wherein: when the rectifier is grounded, the change of the Ug is consistent with the change of a gate pulse of a T1 switching tube, and the input 1 end of the rectifier is judged to be grounded; the change of the Ug is consistent with the change of a gate pulse of a T3 switching tube, and the input 2 end of the rectifier is judged to be grounded; when the inverter is grounded, the change of the Ug is consistent with the change of a gate pulse of a T5 switching tube, and the output 3 end of the inverter is judged to be grounded; the change of the Ug is consistent with the change of a gate pulse of a T7 switching tube, and the output 4 end of the inverter is judged to be grounded; and the change of the Ug is consistent with the change of the gate pulse of the T9 switching tube, and the output 5 end of the inverter is judged to be grounded.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111766534A (en) * | 2020-06-07 | 2020-10-13 | 中车永济电机有限公司 | Traction converter ground fault detection method and device |
| CN112731192A (en) * | 2020-12-14 | 2021-04-30 | 中车永济电机有限公司 | Protection method and test verification method for active power of locomotive traction converter |
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| CN105067940A (en) * | 2015-08-06 | 2015-11-18 | 株洲南车时代电气股份有限公司 | Grounding diagnostic method for main loop of locomotive traction converter |
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| CN102466770A (en) * | 2010-11-11 | 2012-05-23 | 株洲南车时代电气股份有限公司 | Method and system for judging ground fault point of AC-DC-AC (Alternating Current-Direct Current-Alternating Current) electric locomotive |
| CN105067940A (en) * | 2015-08-06 | 2015-11-18 | 株洲南车时代电气股份有限公司 | Grounding diagnostic method for main loop of locomotive traction converter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111766534A (en) * | 2020-06-07 | 2020-10-13 | 中车永济电机有限公司 | Traction converter ground fault detection method and device |
| CN112731192A (en) * | 2020-12-14 | 2021-04-30 | 中车永济电机有限公司 | Protection method and test verification method for active power of locomotive traction converter |
| CN112731192B (en) * | 2020-12-14 | 2024-04-19 | 中车永济电机有限公司 | Protection method and test verification method for active power of locomotive traction converter |
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