CN111130329A - Intermediate direct current circuit of traction converter and traction converter - Google Patents
Intermediate direct current circuit of traction converter and traction converter Download PDFInfo
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- CN111130329A CN111130329A CN201811291900.0A CN201811291900A CN111130329A CN 111130329 A CN111130329 A CN 111130329A CN 201811291900 A CN201811291900 A CN 201811291900A CN 111130329 A CN111130329 A CN 111130329A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- 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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The embodiment of the invention provides a middle direct current loop of a traction converter and the traction converter. The intermediate dc loop of the traction converter comprises: the grounding switch discharging circuit, the grounding detection circuit, the voltage detection circuit, the secondary filter circuit and the direct current supporting circuit are connected in series; one end of the grounding switch discharging circuit is connected with the positive end of the middle direct current loop, the other end of the grounding switch discharging circuit is connected with the negative end of the middle direct current loop, and the grounding switch discharging circuit is connected with the grounding detection circuit, the voltage detection circuit, the secondary filter circuit and the direct current supporting circuit in parallel. Therefore, the positive end and the negative end of the intermediate direct current loop are short-circuited and grounded, and the purpose of releasing electric energy is achieved. More importantly, before the traction converter cabinet is opened, the electric energy of the middle direct current loop is released through the grounding switch discharging circuit, so that the workers are not affected by the fault of the voltage detection circuit, and the safety of the workers is further ensured.
Description
Technical Field
The embodiment of the invention relates to the field of traction converters, in particular to an intermediate direct-current loop of a traction converter and the traction converter.
Background
At present, an alternating current traction motor is mainly adopted in a transmission system of an alternating current locomotive, the power supply mode is alternating current-direct current-alternating current, and the power supply process is as follows: the locomotive supplies power to the primary side of the traction transformer through the pantograph and the main breaker, and the secondary winding of the traction transformer is output to a four-quadrant rectifier in the traction converter, so that the conversion of the power from alternating current to direct current is realized. The converted direct current is output to a middle direct current loop, then the conversion from the direct current to the three-phase alternating current is realized through a traction inverter, and finally the three-phase alternating current is output to a traction motor to provide electric energy for the traction motor.
The intermediate direct current loop has the functions of secondary filtering, direct current supporting, overvoltage suppression, discharging and the like on direct current passing through the four-quadrant rectifier. The discharging function is mainly used for releasing electric energy in the middle direct current loop after the locomotive traction converter stops working, and reducing the voltage of the middle direct current loop to a safe voltage range to ensure the safety of maintenance personnel. In the prior art, as shown in fig. 1, in order to realize the discharging function of the intermediate dc circuit, a fast discharging resistor and a slow discharging resistor are provided in the intermediate dc circuit. The voltage detection board detects the voltage of the middle direct current loop, the voltage detection indicator lamp indicates whether the voltage of the middle direct current loop is reduced to a safe voltage range, and the voltage detection indicator lamp is turned off when the voltage of the middle direct current loop is in the safe voltage range.
When the voltage detection board is out of order, the voltage of the middle direct current loop is not in the safe voltage range, the voltage detection indicator lamp is turned off, and under the condition, a maintainer opens the traction converter cabinet, so that safety accidents can be caused.
Disclosure of Invention
The embodiment of the invention provides a middle direct current loop of a traction converter and the traction converter, which are used for avoiding the occurrence of safety accidents caused by error prompt to workers due to the fault of a voltage detection circuit in the prior art.
In a first aspect, an embodiment of the present invention provides an intermediate dc loop of a traction converter, including: the grounding switch discharging circuit, the grounding detection circuit, the voltage detection circuit, the secondary filter circuit and the direct current supporting circuit are connected in series; one end of the grounding switch discharging circuit is connected with the positive end of the middle direct current loop, the other end of the grounding switch discharging circuit is connected with the negative end of the middle direct current loop, and the grounding switch discharging circuit is connected with the grounding detection circuit, the voltage detection circuit, the secondary filter circuit and the direct current supporting circuit in parallel;
the grounding switch discharging circuit is used for enabling the positive end and the negative end of the intermediate direct current loop to be in short circuit and grounded so as to release electric energy of the intermediate direct current loop when the traction converter stops working;
the grounding detection circuit is used for detecting whether a grounding phenomenon exists in a main circuit of the traction converter when the traction converter works; the main circuit comprises an input circuit, a rectifier circuit, an intermediate direct current loop and a traction inverter circuit;
the voltage detection circuit is used for indicating whether the voltage of the intermediate direct current loop is in a safe range or not;
the secondary filter circuit is used for removing the second harmonic in the voltage output by the rectifier circuit and storing electric energy;
the direct current support circuit is used for storing electric energy, exchanging electric energy and smoothing and filtering the voltage output by the rectifier circuit.
In one possible embodiment, the ground switch discharge circuit includes a ground switch;
when the grounding switch is closed, the grounding switch circuit is grounded.
In one possible embodiment, the ground detection circuit is a floating-point ground resistance voltage division detection circuit.
In one possible implementation, the floating-point ground resistance voltage division detection circuit includes: the circuit comprises a first resistor, a second resistor, a first voltage sensor and a capacitor; one end of the first resistor is connected with the positive end of the middle direct current loop, the other end of the first resistor is connected with one end of the second resistor in series, the other end of the second resistor is connected with the negative end of the middle direct current loop, the capacitor and the first voltage sensor are connected with the second resistor in parallel, and the connection point of the first resistor and the second resistor is grounded;
the capacitor is used for filtering out ripples of voltage between the negative end of the intermediate direct current loop and the grounding end;
the first voltage sensor is used for detecting the voltage between the negative end of the intermediate direct current loop and the grounding end, if the absolute value of the difference value between the voltage and a first preset voltage value is smaller than or equal to a first preset threshold value, it is determined that the grounding phenomenon does not exist in the main circuit of the traction converter, and if the absolute value of the difference value between the voltage and the voltage of the intermediate direct current loop is smaller than or equal to a second preset threshold value, or the voltage is larger than or equal to 0 and smaller than or equal to a third preset threshold value, or the voltage fluctuates in a preset range, it is determined that the grounding phenomenon exists in the main circuit of the traction converter.
In a possible embodiment, the intermediate dc circuit further comprises a second voltage sensor; one end of the second voltage sensor is connected with the positive end of the intermediate direct current loop, and the other end of the second voltage sensor is connected with the negative end of the intermediate direct current loop;
the second voltage sensor is used for detecting the voltage of the intermediate direct current loop.
In one possible embodiment, the first resistor and the second resistor have the same resistance.
In one possible embodiment, the intermediate dc circuit further includes: a chopper fast discharge circuit and a slow discharge circuit; one end of the chopping fast-amplifying circuit is connected with the positive end of the middle direct-current loop, and the other end of the chopping fast-amplifying circuit is connected with the negative end of the middle direct-current loop; the chopping fast discharge circuit is connected with the slow discharge circuit in parallel.
In one possible embodiment, the chopper fast discharge circuit comprises two identical Insulated Gate Bipolar Transistors (IGBTs), two identical diodes, a third resistor and a current sensor; the IGBT element is connected with the positive end of the middle direct-current loop, the IGBT element is connected with the diode in series, the diode is connected with the negative end of the middle direct-current loop, one end of the current sensor is connected between the IGBT element and the diode, the other end of the current sensor is connected with one end of the third resistor, and the other end of the third resistor is connected with the negative end of the middle direct-current loop.
In one possible embodiment, the slow discharge circuit comprises two identical resistors and is connected in parallel with one of the voltage detection circuits.
In a second aspect, an embodiment of the present invention provides a traction converter, including the intermediate dc loop described in any one of the embodiments of the present invention of the first aspect, as well as an input circuit, a rectifier circuit, and a traction inverter circuit.
The intermediate DC loop is connected in series with the input circuit, the rectifier circuit, and the traction inverter circuit.
The embodiment of the invention provides an intermediate direct current loop of a traction converter and the traction converter, wherein a grounding switch discharge circuit is designed in the intermediate direct current loop of the traction converter, the positive end and the negative end of the grounding switch discharge circuit are respectively connected with the positive end and the negative end of the intermediate direct current loop, and when the electric energy of the intermediate direct current loop needs to be released to enable the voltage to be in a safe range, the grounding switch discharge circuit is conducted, so that the positive end and the negative end of the intermediate direct current loop are in short circuit and are grounded, and the purpose of releasing the electric energy is achieved. More importantly, before the traction converter cabinet is opened, the electric energy of the middle direct current loop is released through the grounding switch discharging circuit, so that the staff is not influenced by the voltage detection circuit, namely, when the voltage detection circuit fails and the staff cannot be shown whether the correct voltage of the middle direct current loop is in a safe range, the grounding switch discharging circuit can release the electric energy of the middle direct current loop before the staff opens the traction converter cabinet, and the safety of the staff is further ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a circuit diagram of an intermediate DC loop in the prior art;
fig. 2 is a circuit structure diagram of an intermediate dc loop according to an embodiment of the present invention;
fig. 3 is a circuit diagram of an intermediate dc loop according to another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In a locomotive, the main circuits of the traction converter, which comprise an input circuit, a rectifier circuit, an intermediate direct current circuit and a traction inverter circuit, are concentrated in the traction converter cabinet.
When the locomotive runs, the intermediate direct current loop 10 in the traction converter stores electric energy, so that when the locomotive traction converter stops working and the traction converter cabinet needs to be opened, the electric energy stored in the intermediate direct current loop 10 needs to be fully released, and potential safety hazards are avoided.
Fig. 2 is a circuit structure diagram of an intermediate dc loop according to an embodiment of the present invention. As shown in fig. 2, the intermediate dc circuit 10 includes a ground switch discharge circuit 11, a ground detection circuit 12, a voltage detection circuit 13, a secondary filter circuit 14, and a dc support circuit 15. Fig. 2 shows only the ground switch discharge circuit 11, the ground detection circuit 12, and the voltage detection circuit 13. Optionally, other circuitry, not shown in fig. 2, may be included in the intermediate dc link 100.
It should be noted that, the intermediate dc loop 10 may include other circuits besides the ground switch discharging circuit 11, the ground detection circuit 12, the voltage detection circuit 13, the secondary filter circuit 14 and the dc supporting circuit 15 mentioned in the embodiments of the present invention, which may refer to the prior art specifically and are not described herein again.
One end of the ground switch discharge circuit 11 is connected to the positive terminal of the intermediate dc loop 10, the other end is connected to the negative terminal of the intermediate dc loop 10, and the ground switch discharge circuit 11 is connected in parallel to the ground detection circuit 12, the voltage detection circuit 13, the secondary filter circuit 14, and the dc support circuit 15.
The grounding switch discharging circuit 11 is configured to short-circuit and ground the positive terminal and the negative terminal of the intermediate dc circuit 10 to release the electric energy of the intermediate dc circuit 10 when the traction converter stops operating.
The grounding detection circuit 12 is configured to detect whether a grounding phenomenon exists in a main circuit of the traction converter when the traction converter operates; the main loop comprises a rectifier circuit, an intermediate direct current loop and a traction inverter circuit.
The voltage detection circuit 13 is configured to indicate whether the voltage of the intermediate dc loop 10 is in a safe range.
The secondary filter circuit 14 is configured to filter out a second harmonic in the voltage output by the rectifier circuit, and store the electric energy.
The dc support circuit 15 is configured to store electric energy, exchange electric energy, and smooth and filter the voltage output by the rectifier circuit.
In this embodiment, when the locomotive power supply system provides electric energy to the locomotive, the traction converter is in an operating state, and the intermediate dc loop 10 stores the electric energy. When the locomotive is overhauled by an operator, the traction converter stops working, and when the traction converter cabinet needs to be opened, the voltage of the intermediate direct current loop 10 is ensured to be in a safe range. Therefore, before the traction converter cabinet is opened, the electric energy in the intermediate dc circuit 10 needs to be released to reduce the voltage of the intermediate dc circuit 10 to a safe range.
The intermediate dc circuit 10 is provided with a voltage detection circuit 13, and the voltage detection circuit 13 can detect the voltage of the intermediate dc circuit 10, and two display states are designed to indicate whether the voltage of the intermediate dc circuit 10 is in a safe range. For example, a voltage detection indicator lamp may be designed in the voltage detection circuit 13, and when the voltage detection circuit 13 detects that the voltage of the intermediate dc circuit 10 is higher than the maximum safe voltage, the voltage detection indicator lamp is in an on state; when the voltage detection circuit 13 detects that the voltage of the intermediate dc circuit 10 is in the safe range, the voltage detection indicator lamp is turned off.
In practice, the voltage detection circuit 13 may have a situation where the detection function cannot be normally used, for example, the voltage of the intermediate dc circuit 10 is higher than the maximum safe voltage, and the voltage of the intermediate dc circuit 10 detected by the voltage detection circuit 13 is in a safe range, so that the voltage detection indicator lamp is turned off. If the staff opens the traction converter cabinet at the moment, the personal safety of the staff can be threatened. Therefore, in this embodiment, when the staff needs to open the traction converter cabinet, before opening the traction converter cabinet, the grounding switch discharging circuit 11 is turned on and the grounding switch discharging circuit 11 is kept in the conducting state regardless of whether the voltage in the intermediate dc circuit 10 detected by the voltage detecting circuit 13 is in the safe range. When the ground switch discharge circuit 11 is turned on, the positive terminal and the negative terminal of the ground switch discharge circuit 11 are short-circuited and grounded, and at this time, since the positive terminal and the negative terminal of the ground switch discharge circuit 11 are respectively connected with the positive terminal and the negative terminal of the intermediate dc loop 10, the positive terminal and the negative terminal of the intermediate dc loop 10 are short-circuited and grounded through the ground switch discharge circuit 11, so that the electric energy stored in the intermediate dc loop 10 can be released, and the voltage of the intermediate dc loop 10 is reduced to a safe range.
In this embodiment, the grounding switch discharging circuit is designed in the intermediate dc loop, and the positive terminal and the negative terminal of the grounding switch discharging circuit are respectively connected to the positive terminal and the negative terminal of the intermediate dc loop, so that when the electric energy of the intermediate dc loop needs to be released to make the voltage in the safe range, the grounding switch discharging circuit is turned on, and the positive terminal and the negative terminal of the intermediate dc loop are short-circuited and grounded, thereby achieving the purpose of releasing the electric energy. More importantly, before the traction converter cabinet is opened, the electric energy of the middle direct current loop is released through the grounding switch discharging circuit, so that the staff is not influenced by the voltage detection circuit, namely, when the voltage detection circuit fails and the staff cannot be shown whether the correct voltage of the middle direct current loop is in a safe range, the grounding switch discharging circuit can release the electric energy of the middle direct current loop before the staff opens the traction converter cabinet, and the safety of the staff is further ensured.
Fig. 3 is a circuit diagram of an intermediate dc loop according to another embodiment of the present invention. As shown in fig. 3, on the basis of the embodiment shown in fig. 2, optionally, the ground switch discharging circuit 11 includes a ground switch 111;
the ground switch 111, when closed, grounds the ground switch circuit 11.
In the present embodiment, as shown in fig. 3, two identical voltage detection circuits 131 and 132 are provided in the intermediate dc circuit 10, and two voltage detection indicator lamps 131a and 131b, 131a and 132b are provided in parallel in the voltage detection circuits 131 and 132, respectively. The indicator lamps 131a and 131b, 131a and 132b are in an on state when the voltage in the intermediate dc link 10 is higher than the maximum safe voltage, and the indicator lamps 131a and 131b, 131a and 132b are off when the voltage in the intermediate dc link 10 is in the maximum safe range.
By designing the grounding switch 111 as the grounding switch discharge circuit 11, before the traction converter cabinet is opened by a worker, the grounding switch 111 is closed, so that the purpose of releasing the electric energy of the intermediate direct current loop can be achieved, and the device is simple to operate and low in design cost.
Optionally, the ground detection circuit 12 is a floating-point ground resistance voltage division detection circuit 120.
Optionally, still referring to fig. 3, the floating-point ground resistance voltage division detecting circuit 120 includes: a first resistor R1, a second resistor R2, a first voltage sensor V1 and a capacitor C; one end of the first resistor R1 is connected to the positive terminal of the intermediate dc circuit 10, the other end of the first resistor R1 is connected to one end of the second resistor R2 in series, the other end of the second resistor R2 is connected to the negative terminal of the intermediate dc circuit 10, the capacitor C, the first voltage sensor V1 and the second resistor R2 are connected in parallel, and the connection point of the first resistor R1 and the second resistor R2 is grounded.
The capacitor C is configured to filter out a ripple of the voltage between the negative terminal of the intermediate dc loop 10 and the ground terminal.
The first voltage sensor V1 is configured to detect a voltage between a negative terminal of the intermediate dc loop 10 and a ground terminal, determine that a grounding phenomenon does not exist in the main circuit of the traction converter if an absolute value of a difference between the voltage and a first preset voltage value is less than or equal to a first preset threshold, and determine that a grounding phenomenon exists in the main circuit of the traction converter if the absolute value of the difference between the voltage and the voltage of the intermediate dc loop is less than or equal to a second preset threshold, or the voltage is greater than or equal to 0 and less than or equal to a third preset threshold, or the voltage fluctuates within a preset range.
In this embodiment, as shown in fig. 3, a connection point between the first resistor R1 and the second resistor R2 is grounded, and the first voltage sensor V1 detects a voltage between a negative terminal and a ground terminal of the intermediate dc loop 10, that is, measures a voltage at two ends of the second resistor R2, wherein a voltage value detected by the first voltage sensor V1 is related to resistance values of the first resistor R1 and the second resistor R2, and a magnitude of a first preset voltage value can be determined according to resistance values of the first resistor R1 and the second resistor R2, for example, when the resistance values of the first resistor R1 and the second resistor R2 are equal, the first preset voltage value is half of the intermediate dc loop voltage; when the resistance of the first resistor R1 is half of the resistance of the second resistor R2, the first predetermined voltage is 2/3 of the intermediate dc loop voltage. The first preset threshold, the second preset threshold and the third preset threshold may be selected according to an actual circuit, and the size of the first preset threshold, the size of the second preset threshold and the size of the third preset threshold are not limited in the embodiments of the present invention. And judging whether the main circuit of the traction converter has the grounding phenomenon or not according to the first preset voltage value, the first preset threshold, the second preset threshold and the third preset threshold, the voltage detected by the first voltage sensor V1 and the voltage of the intermediate direct current loop 10.
Optionally, the first resistor R1 and the second resistor R2 have the same resistance.
In this example, the following are exemplified: the resistance values of the first resistor R1 and the second resistor R2 are equal, the voltage of the intermediate dc loop 10 is 2800V, and when the voltage of the first voltage sensor V1 approaches 1/2V of the voltage of the intermediate dc loop 10, that is, the voltage fluctuates about half the voltage of the intermediate dc loop, for example, the voltage of the first voltage sensor V1 is maintained within [1300V, 1500V ], which indicates that the intermediate dc loop 10 is in a normal state; if the voltage at the first voltage sensor V1 approaches the voltage of the intermediate dc circuit 10, for example, the voltage at the first voltage sensor V1 is maintained within [2700V, 2800V ], indicating that the positive terminal of the intermediate dc circuit is grounded; if the voltage at the first voltage sensor V1 approaches 0, for example, the voltage at the first voltage sensor V1 is maintained within [0V, 100V ], indicating that the negative terminal of the intermediate dc loop is grounded; if the voltage at the first voltage sensor V1 fluctuates within the voltage range of the positive and negative intermediate dc circuit 10, it indicates that the input and/or output of the traction converter is grounded. In this example, the first preset threshold, the second preset threshold, and the third preset threshold are all set to 100.
In addition, the connection point of the first resistor and the second resistor is grounded, so that the short circuit phenomenon can be avoided when the main circuit of the traction converter is grounded in a single point.
The capacitor C is connected in parallel with the first voltage sensor V1, and can filter out ripples of voltage between the negative terminal and the ground terminal of the intermediate dc circuit 10, and reduce fluctuation of a voltage value measured by the first voltage sensor V1, thereby measuring voltages at two ends of the second resistor R2 more accurately.
It should be noted that, in this embodiment, it may also be configured to determine whether the main circuit of the traction converter has the ground fault and detect a position where the ground fault occurs according to the voltage across the first resistor.
In this embodiment, the connection point of the first resistor and the second resistor is grounded, and according to the change of the voltage value at the two ends of the second resistor, not only can whether the main circuit of the traction converter has the ground fault be determined, but also the position where the ground fault occurs can be detected.
Optionally, with continued reference to fig. 3, the intermediate dc link 10 further includes a second voltage sensor V2; one end of the second voltage sensor V2 is connected to the positive terminal of the intermediate dc circuit 10, and the other end is connected to the negative terminal of the intermediate dc circuit 10.
The second voltage sensor V2 is configured to detect a voltage of the intermediate dc circuit 10.
And determining whether the traction converter has the ground fault by comparing the voltage values detected by the first voltage sensor V1 and the second voltage sensor V2, and judging the position of the ground fault.
Optionally, with continued reference to fig. 3, the intermediate dc loop 10 further includes: a chopper fast discharge circuit 16 and a slow discharge circuit 17; one end of the chopper fast-discharge circuit 16 is connected with the positive end of the intermediate direct-current circuit 10, and the other end is connected with the negative end of the intermediate direct-current circuit 10; the chopping fast discharge circuit 16 is connected in parallel with the slow discharge circuit 17.
In this embodiment, optionally, the chopper fast discharge circuit 16 includes two identical IGBT elements 161a and 161b, two identical diodes 162a and 162b, a third resistor R3, and a current sensor I1; the IGBT elements 161a and 161b are connected to the positive terminal of the intermediate dc link 10, the IGBT elements 161a and 161b are connected to the diodes 161a and 162b in series, the diodes 162a and 162b are connected to the negative terminal of the intermediate dc link 10, one end of the current sensor I1 is connected between the IGBT element 161a and the diode 161a and between the IGBT element 161b and the diode 161b, the other end is connected to one end of the third resistor R3, and the other end of the third resistor is connected to the negative terminal of the intermediate dc link 10.
Alternatively, with continued reference to fig. 3, the slow discharge circuit 17 comprises two identical resistors R4 and R5, each connected in parallel with one of the voltage detection circuits 13.
In this embodiment, the working principle of the chopping fast discharge circuit 16 and the slow discharge circuit 17 can refer to the prior art, and will not be described herein again.
The intermediate dc link 10 of any of the embodiments described above may be applied to a traction converter 100, with continued reference to fig. 3, the traction converter 100 main circuit comprising the intermediate dc link 10 as well as the input circuit 20, the rectifier circuit 30, the traction inverter circuit 40. Optionally, the traction converter 100 may also comprise other components, not shown in fig. 3.
The intermediate DC loop is connected in series with the input circuit, the rectifier circuit, and the traction inverter circuit. Wherein, the first alternating current passes through the input circuit 20 flows to the rectifier circuit 30, the rectifier circuit 30 will the first alternating current rectifies to the first direct current, the first direct current flows to the middle direct current loop 10, the warp obtains the second direct current after the middle direct current loop 10 filters, the first direct current flows to the traction inverter circuit 40, the traction inverter circuit 40 will the second direct current inverter is the second alternating current
In this embodiment, the working principle of the main circuit of the traction converter 100 can refer to the prior art, and is not described herein again.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. An intermediate dc link of a traction converter, comprising: the grounding switch discharging circuit, the grounding detection circuit, the voltage detection circuit, the secondary filter circuit and the direct current supporting circuit are connected in series; one end of the grounding switch discharging circuit is connected with the positive end of the middle direct current loop, the other end of the grounding switch discharging circuit is connected with the negative end of the middle direct current loop, and the grounding switch discharging circuit is connected with the grounding detection circuit, the voltage detection circuit, the secondary filter circuit and the direct current supporting circuit in parallel;
the grounding switch discharging circuit is used for enabling the positive end and the negative end of the intermediate direct current loop to be in short circuit and grounded so as to release electric energy of the intermediate direct current loop when the traction converter stops working;
the grounding detection circuit is used for detecting whether a grounding phenomenon exists in a main circuit of the traction converter when the traction converter works; the main circuit comprises an input circuit, a rectifier circuit, an intermediate direct current loop and a traction inverter circuit;
the voltage detection circuit is used for indicating whether the voltage of the intermediate direct current loop is in a safe range or not;
the secondary filter circuit is used for removing the second harmonic in the voltage output by the rectifier circuit and storing electric energy;
the direct current support circuit is used for storing electric energy, exchanging electric energy and smoothing and filtering the voltage output by the rectifier circuit.
2. The intermediate dc loop of claim 1, wherein the ground switch discharge circuit includes a ground switch;
when the grounding switch is closed, the grounding switch circuit is grounded.
3. The intermediate dc loop of claim 1, wherein the ground detection circuit is a floating-point ground resistance divider detection circuit.
4. The intermediate dc loop of claim 2, wherein the floating-point ground resistance voltage division detection circuit comprises: the circuit comprises a first resistor, a second resistor, a first voltage sensor and a capacitor; one end of the first resistor is connected with the positive end of the middle direct current loop, the other end of the first resistor is connected with one end of the second resistor in series, the other end of the second resistor is connected with the negative end of the middle direct current loop, the capacitor and the first voltage sensor are connected with the second resistor in parallel, and the connection point of the first resistor and the second resistor is grounded;
the capacitor is used for filtering out ripples of voltage between the negative end of the intermediate direct current loop and the grounding end;
the first voltage sensor is used for detecting the voltage between the negative end of the intermediate direct current loop and the grounding end, if the absolute value of the difference value between the voltage and a first preset voltage value is smaller than or equal to a first preset threshold value, it is determined that the grounding phenomenon does not exist in the main circuit of the traction converter, and if the absolute value of the difference value between the voltage and the voltage of the intermediate direct current loop is smaller than or equal to a second preset threshold value, or the voltage is larger than or equal to 0 and smaller than or equal to a third preset threshold value, or the voltage fluctuates in a preset range, it is determined that the grounding phenomenon exists in the main circuit of the traction converter.
5. The intermediate dc loop of claim 4, further comprising a second voltage sensor; one end of the second voltage sensor is connected with the positive end of the intermediate direct current loop, and the other end of the second voltage sensor is connected with the negative end of the intermediate direct current loop;
the second voltage sensor is used for detecting the voltage of the intermediate direct current loop.
6. The intermediate DC loop of claim 4, wherein the first resistor and the second resistor have equal resistance values.
7. The intermediate dc loop according to any of claims 1-6, further comprising: a chopper fast discharge circuit and a slow discharge circuit; one end of the chopping fast-amplifying circuit is connected with the positive end of the middle direct-current loop, and the other end of the chopping fast-amplifying circuit is connected with the negative end of the middle direct-current loop; the chopping fast discharge circuit is connected with the slow discharge circuit in parallel.
8. The intermediate direct current loop of claim 7, wherein the chopper fast discharge circuit comprises two identical IGBT elements, two identical diodes, a third resistor and a current sensor; the IGBT element is connected with the positive end of the middle direct-current loop, the IGBT element is connected with the diode in series, the diode is connected with the negative end of the middle direct-current loop, one end of the current sensor is connected between the IGBT element and the diode, the other end of the current sensor is connected with one end of the third resistor, and the other end of the third resistor is connected with the negative end of the middle direct-current loop.
9. The intermediate dc loop of claim 7, wherein the slow discharge circuit comprises two identical resistors and is connected in parallel with one of the voltage detection circuits.
10. A traction converter comprising an intermediate dc link as claimed in any one of claims 1 to 9 and an input circuit, a rectifier circuit, a traction inverter circuit;
the intermediate DC loop is connected in series with the input circuit, the rectifier circuit, and the traction inverter circuit.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811291900.0A CN111130329A (en) | 2018-10-31 | 2018-10-31 | Intermediate direct current circuit of traction converter and traction converter |
| PCT/CN2018/117029 WO2020087599A1 (en) | 2018-10-31 | 2018-11-22 | Intermediate direct-current loop of traction converter, and traction converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811291900.0A CN111130329A (en) | 2018-10-31 | 2018-10-31 | Intermediate direct current circuit of traction converter and traction converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111130329A true CN111130329A (en) | 2020-05-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811291900.0A Pending CN111130329A (en) | 2018-10-31 | 2018-10-31 | Intermediate direct current circuit of traction converter and traction converter |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN111130329A (en) |
| WO (1) | WO2020087599A1 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112379305A (en) * | 2020-10-29 | 2021-02-19 | 中车大连电力牵引研发中心有限公司 | Grounding detection circuit of traction converter and control method thereof |
| 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 |
| CN113014118A (en) * | 2021-04-21 | 2021-06-22 | 株洲中车时代电气股份有限公司 | Current transformer |
| CN113193597A (en) * | 2021-05-27 | 2021-07-30 | 阳光电源股份有限公司 | Grounding control method and device of photovoltaic inverter system and photovoltaic power generation system |
| CN113193597B (en) * | 2021-05-27 | 2024-05-14 | 阳光电源股份有限公司 | Grounding control method and device of photovoltaic inverter system and photovoltaic power generation system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009207251A (en) * | 2008-02-27 | 2009-09-10 | Fuji Electric Systems Co Ltd | Load driving system |
| CN203205867U (en) * | 2013-05-02 | 2013-09-18 | 南车戚墅堰机车有限公司 | Intermediate loop discharging circuit used for AC transmission locomotive main circuit |
| CN105720893A (en) * | 2014-12-02 | 2016-06-29 | 永济新时速电机电器有限责任公司 | Traction converter with secondary filter circuit |
| CN105790597A (en) * | 2016-03-29 | 2016-07-20 | 中车永济电机有限公司 | Main circuit of traction converter of PMSMs (Permanent magnet synchronous motors) for high speed railway |
| CN206321736U (en) * | 2016-11-21 | 2017-07-11 | 中车大连电力牵引研发中心有限公司 | Grounded inspection circuit |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19639279C2 (en) * | 1996-09-25 | 2002-01-17 | Daimlerchrysler Rail Systems | Converter circuit |
| CN201252488Y (en) * | 2008-08-14 | 2009-06-03 | 铁道部运输局 | High-power traction convertor |
| CN103124132A (en) * | 2011-11-18 | 2013-05-29 | 永济新时速电机电器有限责任公司 | Locomotive traction converter |
| CN103129564B (en) * | 2011-11-29 | 2016-04-06 | 永济新时速电机电器有限责任公司 | Electric locomotive traction system |
| CN104730407B (en) * | 2015-02-03 | 2017-12-12 | 南车株洲电力机车研究所有限公司 | A kind of grounded inspection circuit |
-
2018
- 2018-10-31 CN CN201811291900.0A patent/CN111130329A/en active Pending
- 2018-11-22 WO PCT/CN2018/117029 patent/WO2020087599A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009207251A (en) * | 2008-02-27 | 2009-09-10 | Fuji Electric Systems Co Ltd | Load driving system |
| CN203205867U (en) * | 2013-05-02 | 2013-09-18 | 南车戚墅堰机车有限公司 | Intermediate loop discharging circuit used for AC transmission locomotive main circuit |
| CN105720893A (en) * | 2014-12-02 | 2016-06-29 | 永济新时速电机电器有限责任公司 | Traction converter with secondary filter circuit |
| CN105790597A (en) * | 2016-03-29 | 2016-07-20 | 中车永济电机有限公司 | Main circuit of traction converter of PMSMs (Permanent magnet synchronous motors) for high speed railway |
| CN206321736U (en) * | 2016-11-21 | 2017-07-11 | 中车大连电力牵引研发中心有限公司 | Grounded inspection circuit |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112379305A (en) * | 2020-10-29 | 2021-02-19 | 中车大连电力牵引研发中心有限公司 | Grounding detection circuit of traction converter and control method thereof |
| CN112379305B (en) * | 2020-10-29 | 2024-04-19 | 中车大连电力牵引研发中心有限公司 | Ground detection circuit of traction converter and control method thereof |
| 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 |
| CN113014118A (en) * | 2021-04-21 | 2021-06-22 | 株洲中车时代电气股份有限公司 | Current transformer |
| CN113193597A (en) * | 2021-05-27 | 2021-07-30 | 阳光电源股份有限公司 | Grounding control method and device of photovoltaic inverter system and photovoltaic power generation system |
| CN113193597B (en) * | 2021-05-27 | 2024-05-14 | 阳光电源股份有限公司 | Grounding control method and device of photovoltaic inverter system and photovoltaic power generation system |
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|---|---|
| WO2020087599A1 (en) | 2020-05-07 |
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