CN113224996A - Coal mining machine traction loop control circuit and control method - Google Patents
Coal mining machine traction loop control circuit and control method Download PDFInfo
- Publication number
- CN113224996A CN113224996A CN202110694222.8A CN202110694222A CN113224996A CN 113224996 A CN113224996 A CN 113224996A CN 202110694222 A CN202110694222 A CN 202110694222A CN 113224996 A CN113224996 A CN 113224996A
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- Prior art keywords
- traction
- frequency converter
- circuit
- detection
- mining machine
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C29/00—Propulsion of machines for slitting or completely freeing the mineral from the seam
Abstract
The invention relates to a control circuit and a control method of a traction circuit of a coal mining machine, wherein the control circuit comprises a traction transformer, a traction contactor and a traction frequency converter which are sequentially connected, the secondary side of the traction transformer is connected with a direct current bus of the traction frequency converter through a frequency converter pre-detection circuit, and the feedback signal output end of a frequency converter control unit is connected into a coal mining machine control system for controlling the traction contactor to be opened and closed; the control method is that low-voltage alternating current on the secondary side of the traction transformer is converted into low-voltage direct current through a frequency converter pre-detection loop and is output to a direct current bus of the traction frequency converter to supply power to a frequency converter control unit, so that the frequency converter carries out self-detection, and the frequency converter control unit feeds back or does not feed back a signal allowing the traction frequency converter to start to a coal mining machine control system according to the self-detection result of the frequency converter. The invention realizes the self-check of the traction frequency converter before the power is transmitted to the traction frequency converter, and then determines whether the power can be transmitted to the traction frequency converter according to the self-check result, thereby protecting the frequency converter from being seriously damaged.
Description
Technical Field
The invention relates to a traction frequency converter control circuit and a traction frequency converter control method special for a coal mining machine, and belongs to the technical field of frequency converters.
Background
The starting control logic of the existing coal mining machine traction frequency converter control loop is that a coal mining machine control system enables a traction contactor to be attracted, then a traction frequency converter is directly powered by an input end, and after a direct current bus of the traction frequency converter accumulates electric energy, a traction frequency converter control unit is used for taking power from the direct current bus of the traction frequency converter and starting self-checking of the frequency converter. Therefore, before the traction contactor is attracted and supplies power to the traction frequency converter, the traction frequency converter cannot complete self-checking. If the frequency converter has a fault, the traction frequency converter is easily damaged because the high-voltage alternating-current power supply is directly used for supplying power when the traction contactor is attracted.
Disclosure of Invention
The invention aims to provide a control circuit and a control method for a traction loop of a coal mining machine, which can realize self-check of a traction frequency converter before the input end of the traction frequency converter is powered on, and then determine whether the input end of the traction frequency converter is powered on or not according to the self-check result, so that the frequency converter is protected from being seriously damaged.
The main technical scheme of the invention is as follows:
the utility model provides a coal-winning machine traction circuit control circuit, is including the traction transformer, draw the contactor and draw the converter that connect gradually, and traction transformer's secondary side still is connected with the input in a converter pre-detection return circuit, the output in converter pre-detection return circuit is connected draw the direct current generating line of converter, the secondary side that draws the contactor is connected with the power input end who draws the converter, the feedback signal output of the converter control unit in drawing the converter inserts the coal-winning machine control system who is used for controlling the contactor to open and shut.
The frequency converter pre-detection loop can comprise a pre-detection transformer, a pre-detection rectification circuit, a pre-detection filter circuit, a pre-detection voltage stabilizing circuit and a pre-detection anti-reverse current circuit which are connected in sequence.
The pre-detection rectifying circuit is a three-phase rectifying bridge consisting of rectifying diodes.
The pre-detection filter circuit and the pre-detection voltage stabilizing circuit are connected in parallel between the positive electrode and the negative electrode of the output end of the pre-detection rectifying circuit.
The pre-detection reverse-flow-prevention circuit can be composed of a reverse-flow-prevention diode, the anode of the reverse-flow-prevention diode is connected with the anode of the output end of the pre-detection rectification circuit, the cathode of the reverse-flow-prevention diode is connected with the anode of a direct-current bus of the traction frequency converter, and the cathode of the output end of the pre-detection rectification circuit is connected with the cathode of the direct-current bus of the traction frequency converter.
The pre-detection filter circuit comprises a filter capacitor group, the pre-detection voltage stabilizing circuit is composed of a voltage stabilizing diode and a current limiting resistor which are connected in series, and the cathode of the voltage stabilizing diode is connected with the anode of the output end of the pre-detection rectifying circuit.
The filter capacitor bank at least comprises one capacitor, and the capacitor can be a thin film capacitor or an electrolytic capacitor.
And the two ends of the filter capacitor bank are preferably connected with a voltage-sharing resistor in parallel.
The secondary side of the traction contactor is preferably connected with the power input end of the traction frequency converter through a reactor.
Before a traction contactor is actuated to supply three-phase alternating current output by a traction transformer to a traction frequency converter, a frequency converter pre-detection loop is used for carrying out voltage reduction and rectification treatment on the three-phase alternating current output by the traction transformer;
sending the processed low-voltage direct current to a direct current bus of the traction frequency converter, so that a frequency converter control unit of the traction frequency converter can get power from the direct current bus and carry out self-checking on the frequency converter;
if the frequency converter does not find the traction frequency converter to have a fault through self-inspection, the frequency converter control unit feeds back a start-allowing signal to the coal mining machine control system, allows the traction contactor to be attracted under the control of the coal mining machine control system and supplies power to the input end of the traction frequency converter; and if the self-checking of the frequency converter finds that the traction frequency converter has a fault, the frequency converter control unit does not feed back a start permitting signal to the coal mining machine control system or feeds back a start prohibiting signal to the coal mining machine control system, and the traction contactor is prohibited from being pulled in.
The invention has the beneficial effects that:
the invention provides a coal mining machine traction loop control circuit and a corresponding control method, which can protect a traction frequency converter from hardware damage and fault aggravation of the frequency converter caused by power supply in a fault state by carrying out self-checking before the traction frequency converter is electrified and determining whether to supply power to the traction frequency converter according to whether the traction frequency converter has a fault or not, thereby improving the use safety and reliability of the coal mining machine traction frequency converter and reducing the maintenance cost of the frequency converter.
Drawings
FIG. 1 is a functional block diagram of one embodiment of a coal mining machine haulage loop control circuit of the present invention;
FIG. 2 is a logic block diagram of a coal cutter traction circuit control of the present invention.
Detailed Description
The invention discloses a traction circuit control circuit of a coal mining machine, which can meet the requirement that the self-inspection of a traction frequency converter is carried out before the input end of the traction frequency converter of the coal mining machine supplies power, and comprises a traction transformer, a traction contactor and the traction frequency converter (namely a trunk circuit of a traction circuit of the coal mining machine) which are sequentially connected as shown in figure 1, wherein the primary side of the traction transformer is the power supply input end of the coal mining machine and is connected with the power supply of the coal mining machine. The traction contactor is used for controlling the power input of the traction frequency converter. The traction frequency converter is used for driving a traction motor. The secondary side of the traction transformer is also connected with the input end of a frequency converter pre-detection loop, the output end of the frequency converter pre-detection loop is connected with a direct-current bus of the traction frequency converter, the secondary side of the traction contactor is connected with the power input end of the traction frequency converter, and the feedback signal output end of a frequency converter control unit in the traction frequency converter is connected into a coal mining machine control system for controlling the opening and closing of the traction contactor.
The frequency converter pre-detection loop comprises a pre-detection transformer, a pre-detection rectification circuit, a pre-detection filter circuit, a pre-detection voltage stabilizing circuit and a pre-detection anti-reverse current circuit which are sequentially connected. The primary side terminal of the pre-detection transformer is formed as the input end of the pre-detection loop of the frequency converter, and the pre-detection transformer is used for converting the three-phase alternating current output by the traction transformer into low-voltage three-phase alternating current. And the output end of the pre-detection anti-reverse current circuit is formed as the output end of the frequency converter pre-detection loop. The positive and negative poles of the output end of the frequency converter pre-detection loop correspond to the positive and negative poles of a direct current bus of the traction frequency converter respectively.
The pre-detection rectification circuit is used for converting low-voltage three-phase alternating current output after voltage reduction through the pre-detection transformer into low-voltage direct current, and the pre-detection rectification circuit is a three-phase rectification bridge consisting of 6 rectification diodes.
The pre-detection filter circuit and the pre-detection voltage stabilizing circuit are connected in parallel between the positive electrode and the negative electrode of the output end of the pre-detection rectifying circuit and are respectively used for filtering and stabilizing low-voltage direct current output by the pre-detection rectifying circuit.
The pre-detection anti-reflux circuit is used for protecting the circuit, preventing reverse current and preventing the circuit from being damaged by the reverse current. The pre-detection anti-reverse-flow circuit consists of an anti-reverse-flow diode, the anode of the anti-reverse-flow diode is connected with the anode of the output end of the pre-detection rectification circuit, and the cathode of the anti-reverse-flow diode is connected with the anode of a direct-current bus of the traction frequency converter. And the negative electrode of the output end of the pre-detection rectifying circuit is connected with the negative electrode of the direct current bus of the traction frequency converter.
The pre-detection filter circuit comprises a filter capacitor bank, and the filter capacitor bank is used for reducing the influence of alternating current ripple waves on the circuit. The pre-detection voltage stabilizing circuit consists of a voltage stabilizing diode and a current limiting resistor which are connected in series, and the cathode of the voltage stabilizing diode is connected with the anode of the output end of the pre-detection rectifying circuit. The pre-detection voltage stabilizing circuit is used for keeping the stability of direct-current voltage in a pre-detection loop of the frequency converter, and the current limiting resistor can limit current flowing through the voltage stabilizing diode, so that the voltage stabilizing value of the pre-detection voltage stabilizing circuit is regulated and controlled while the voltage stabilizing diode is protected.
The filter capacitor bank at least comprises one capacitor, and the capacitor is a thin film capacitor or an electrolytic capacitor.
The voltage-sharing resistor is preferably connected in parallel at two ends of the filter capacitor group and used for avoiding uneven voltage division caused by poor consistency of leakage current of the filter capacitor and balancing the voltage at two ends of the filter capacitor, so that the filter capacitor is protected, and the service life of the capacitor group is prolonged. Meanwhile, the voltage-sharing resistor can also be used for discharging to the filter capacitor when the machine is stopped.
And the secondary side of the traction contactor is connected with the power input end of the traction frequency converter through the reactor so as to inhibit surge current and surge voltage and reduce the surge damage to the traction frequency converter.
The invention also discloses a coal mining machine traction loop control method which can be used for controlling the coal mining machine traction loop control circuit. As shown in fig. 2, in the control method, when the coal mining machine is powered on, and before the traction contactor is closed to output the three-phase alternating current output by the traction transformer to the traction frequency converter, the three-phase alternating current output by the traction transformer is subjected to voltage reduction and rectification processing through a frequency converter pre-detection loop to obtain low-voltage direct current; and sending the processed low-voltage direct current to a direct current bus of the traction frequency converter, so that a frequency converter control unit of the traction frequency converter can obtain power from the direct current bus and perform self-checking on the frequency converter.
If the frequency converter does not find the traction frequency converter to have a fault through self-checking, the frequency converter control unit feeds back a start permitting signal to the coal mining machine control system to permit the traction contactor to be attracted, the coal mining machine control system can control the traction contactor to be attracted in the state to supply power to the input end of the traction frequency converter, and an operator can control the traction contactor to be attracted and start the traction frequency converter through commands such as traction starting and the like during specific operation; if the self-checking of the frequency converter finds that the traction frequency converter has a fault, the frequency converter control unit does not feed back a start permitting signal to the coal mining machine control system or feeds back a start prohibiting signal to the coal mining machine control system, and prohibits the traction contactor from being pulled in, and the coal mining machine control system cannot control the traction contactor to be pulled in this state, so that the traction frequency converter cannot be supplied with power.
The method can avoid hardware damage and fault aggravation of the traction frequency converter caused by power supply in a fault state, improve the use safety of the traction frequency converter of the coal mining machine and reduce the maintenance cost of the traction frequency converter.
The frequency converter pre-detection loop can adopt a pre-detection transformer, a pre-detection rectification circuit, a pre-detection filter circuit, a pre-detection voltage stabilizing circuit and a pre-detection anti-reverse current circuit which are connected in sequence, and further filtering, voltage stabilizing and anti-reverse current processing are carried out after voltage reduction and rectification, so that more stable and reliable low-voltage direct current is provided for a frequency converter control unit.
The coal mining machine traction circuit control circuit is a circuit basis for implementing the coal mining machine traction circuit control method and is also a physical presentation of the coal mining machine traction circuit control method.
Claims (10)
1. The utility model provides a coal-winning machine traction circuit control circuit which characterized in that: the system comprises a traction transformer, a traction contactor and a traction frequency converter which are sequentially connected, wherein the secondary side of the traction transformer is also connected with the input end of a frequency converter pre-detection loop, the output end of the frequency converter pre-detection loop is connected with a direct-current bus of the traction frequency converter, the secondary side of the traction contactor is connected with the power input end of the traction frequency converter, and the feedback signal output end of a frequency converter control unit in the traction frequency converter is connected into a coal mining machine control system for controlling the opening and closing of the traction contactor.
2. The shearer haulage circuit control circuit of claim 1, wherein: the frequency converter pre-detection loop comprises a pre-detection transformer, a pre-detection rectification circuit, a pre-detection filter circuit, a pre-detection voltage stabilizing circuit and a pre-detection anti-reverse current circuit which are sequentially connected.
3. The shearer haulage circuit control circuit of claim 2, wherein: the pre-detection rectifying circuit is a three-phase rectifying bridge consisting of rectifying diodes.
4. The coal mining machine traction circuit control circuit of claim 3, wherein: the pre-detection filter circuit and the pre-detection voltage stabilizing circuit are connected in parallel between the positive electrode and the negative electrode of the output end of the pre-detection rectifying circuit.
5. The coal mining machine traction circuit control circuit of claim 4, wherein: the pre-detection anti-reverse-flow circuit is composed of an anti-reverse-flow diode, the anode of the anti-reverse-flow diode is connected with the anode of the output end of the pre-detection rectification circuit, the cathode of the anti-reverse-flow diode is connected with the anode of a direct-current bus of the traction frequency converter, and the cathode of the output end of the pre-detection rectification circuit is connected with the cathode of the direct-current bus of the traction frequency converter.
6. The shearer haulage circuit control circuit of claim 5, wherein: the pre-detection filter circuit comprises a filter capacitor group, the pre-detection voltage stabilizing circuit is composed of a voltage stabilizing diode and a current limiting resistor which are connected in series, and the cathode of the voltage stabilizing diode is connected with the anode of the output end of the pre-detection rectifying circuit.
7. The shearer haulage circuit control circuit of claim 6, wherein: the filter capacitor bank at least comprises one capacitor, and the capacitor is a thin film capacitor or an electrolytic capacitor.
8. The coal cutter traction circuit control circuit of claim 6 or 7 wherein: and two ends of the filter capacitor bank are connected with a voltage-sharing resistor in parallel.
9. The miner traction circuit control circuit of claim 1, 2, 3, 4, 5, 6, 7 or 8, wherein: and the secondary side of the traction contactor is connected with the power input end of the traction frequency converter through the reactor.
10. A coal mining machine traction loop control method is characterized in that:
before the traction contactor is actuated to supply the three-phase alternating current output by the traction transformer to the traction frequency converter, the three-phase alternating current output by the traction transformer is subjected to voltage reduction and rectification treatment through a frequency converter pre-detection loop;
sending the processed low-voltage direct current to a direct current bus of the traction frequency converter, so that a frequency converter control unit of the traction frequency converter can get power from the direct current bus and carry out self-checking on the frequency converter;
if the frequency converter does not find the traction frequency converter to have a fault through self-inspection, the frequency converter control unit feeds back a start-allowing signal to the coal mining machine control system, allows the traction contactor to be attracted under the control of the coal mining machine control system and supplies power to the input end of the traction frequency converter; and if the self-checking of the frequency converter finds that the traction frequency converter has a fault, the frequency converter control unit does not feed back a start permitting signal to the coal mining machine control system or feeds back a start prohibiting signal to the coal mining machine control system, and the traction contactor is prohibited from being pulled in.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110694222.8A CN113224996A (en) | 2021-06-22 | 2021-06-22 | Coal mining machine traction loop control circuit and control method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110694222.8A CN113224996A (en) | 2021-06-22 | 2021-06-22 | Coal mining machine traction loop control circuit and control method |
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| Publication Number | Publication Date |
|---|---|
| CN113224996A true CN113224996A (en) | 2021-08-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110694222.8A Pending CN113224996A (en) | 2021-06-22 | 2021-06-22 | Coal mining machine traction loop control circuit and control method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116298561A (en) * | 2023-02-10 | 2023-06-23 | 常熟天地煤机装备有限公司 | Voltage phase sequence detection system for four-quadrant frequency converter |
-
2021
- 2021-06-22 CN CN202110694222.8A patent/CN113224996A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116298561A (en) * | 2023-02-10 | 2023-06-23 | 常熟天地煤机装备有限公司 | Voltage phase sequence detection system for four-quadrant frequency converter |
| CN116298561B (en) * | 2023-02-10 | 2024-01-09 | 常熟天地煤机装备有限公司 | Voltage phase sequence detection system for four-quadrant frequency converter |
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