CN116317616B - Four-quadrant three-level explosion-proof frequency converter movement device - Google Patents
Four-quadrant three-level explosion-proof frequency converter movement device Download PDFInfo
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Classifications
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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
- H02M5/4585—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 having a rectifier with controlled elements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00016—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using a wired telecommunication network or a data transmission bus
- H02J13/00017—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using a wired telecommunication network or a data transmission bus using optical fiber
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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
- H02M1/14—Arrangements for reducing ripples from dc input or output
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/003—Constructional details, e.g. physical layout, assembly, wiring or busbar connections
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal 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
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal 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, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal 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, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal 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, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal 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
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal 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, e.g. single switched pulse inverters
- H02M7/539—Conversion of dc power input into ac power output without possibility of reversal 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, e.g. single switched pulse inverters with automatic control of output wave form or frequency
- H02M7/5395—Conversion of dc power input into ac power output without possibility of reversal 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, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation
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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
- H02P27/06—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 using dc to ac converters or inverters
- H02P27/08—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 using dc to ac converters or inverters with pulse width modulation
- H02P27/085—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 using dc to ac converters or inverters with pulse width modulation wherein the PWM mode is adapted on the running conditions of the motor, e.g. the switching frequency
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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
- H02P27/06—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 using dc to ac converters or inverters
- H02P27/08—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 using dc to ac converters or inverters with pulse width modulation
- H02P27/12—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 using dc to ac converters or inverters with pulse width modulation pulsing by guiding the flux vector, current vector or voltage vector on a circle or a closed curve, e.g. for direct torque control
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Ac-Ac Conversion (AREA)
Abstract
The application relates to the technical field of circuit control, in particular to a four-quadrant three-level explosion-proof frequency converter movement device, which comprises a cold feedback unit and an inverter power supply; and the two sides of the feedback unit IGBT module are respectively provided with a capacitor positive electrode busbar and a capacitor negative electrode busbar which are respectively and electrically connected with the capacitor, and the busbars adopt laminated busbars. The device adopts a three-level vector control theory, solves the problems of low torque and difficult heavy load starting when the explosion-proof motor is at a low speed, has quick response to load and stable rotating speed, and can achieve the optimal control effect in a mine dragging control system. And the frequency conversion machine core is reasonably utilized in the installation space, so that the problem of low space utilization rate of the explosion-proof machine case is effectively solved, and the device has the characteristics of reasonable design, small volume, convenience in assembly, low cost and the like.
Description
Technical Field
The application relates to the technical field of circuit control, in particular to a four-quadrant three-level explosion-proof frequency converter movement device, an explosion-proof four-quadrant frequency converter with the movement device and a mining underground mobile substation provided with the frequency converter.
Background
The coal mine intellectualization is a core technical support for high-quality development of coal industry, is a comprehensive stage of coal mechanized development, is a new direction of the revolution of coal productivity and production modes, and accelerates the recommendation of an intelligent coal mining working face and the establishment of the intelligent coal mine, thereby being a necessary requirement for high-quality development of the coal industry in the new period of China.
The frequency converter is an important requirement for coal mine intellectualization, and is particularly applied to key technologies of intelligent speed-regulating unmanned systems of coal flow systems. With the requirements of underground intelligent working surfaces, the control requirements of coal mine equipment belts, overhead man-riding devices and endless rope winches are higher and higher, and the requirements of main movement parts of four-quadrant frequency conversion are particularly important. The coal mine site has the problems of low power factor of a power grid, large voltage fluctuation, deterioration of power supply quality, serious harmonic pollution, lower power factor, larger system voltage loss, small installation volume and the like.
At present, the intelligent working face needs fewer people, is unmanned, can be remotely monitored and can operate equipment in real time. This requires that the frequency converter must have a low failure rate and a fast control performance. At present, the frequency converter for mines in China, in particular to a four-quadrant frequency converter core, has the problems of large volume, high fault rate, inconvenient maintenance, poor quality of components, easiness in machine explosion and the like, and seriously influences the intelligent development degree of coal mines.
Disclosure of Invention
The technical problem solved by the application is that a four-quadrant three-level explosion-proof frequency converter movement device is realized by adopting the following technical scheme:
a four-quadrant three-level explosion-proof frequency converter movement device comprises a main control board, an I/O board, an input reactor, an input contactor, a charging resistor, a filter capacitor, a laminated busbar, a feedback unit, an inversion unit and a keyboard display sheet metal part.
The I/O board is connected with the main control board and communicates through the Ethernet. The main control board is connected with the feedback unit and the inversion unit through an optical fiber communication mode,
the three-phase power supply is connected with the input reactor, each phase in the three-phase power supply is connected with a charging resistor through a switch and an input contactor respectively after passing through the input reactor, wires after the input contactor and the charging resistor are converged and then enter a feedback unit for carrying out, the feedback unit is connected with a filter capacitor and an inversion unit, and the inversion unit is connected with a motor. The power input by the power grid enters the feedback unit to be rectified and then is output to the inversion unit to operate the motor.
The part of the feedback unit connected with the filter capacitor is provided with a laminated busbar. The feedback unit of the frequency converter is connected with the filtering power supply by adopting the laminated busbar, so that the frequency converter has the effects of reducing stray inductance and peak voltage protection IGBT, is easy to install, is simple and compact in design, saves internal space and reduces cost.
The feedback unit and the inversion unit are composed of IGBT and a driving board and receive a driving command issued by the main control board.
The filter capacitor is a thin film capacitor. The thin film capacitor has the advantages of no polarity, high insulation resistance, excellent frequency characteristic (wide frequency response), small dielectric loss and the like. The thin film capacitors are connected in parallel by two groups after being connected in series. The series voltage increases and the capacity is unchanged. The parallel voltage is unchanged, the capacity is increased, and the filter energy storage effect of the frequency converter is met.
Furthermore, the operation command mode of the four-quadrant three-level explosion-proof frequency converter movement device is keyboard control, and the keyboard can monitor the operation data of the frequency converter in real time.
Furthermore, the IGBT and the driving plate are directly connected, the direct connection is bolt or welded and fixed, and no connecting line exists between the IGBT and the driving plate.
Furthermore, the control mode of the four-quadrant three-level explosion-proof frequency converter movement device is speed open-loop vector control or speed closed-loop vector control. The motor dynamic response and precision adopting the speed open-loop control are inferior to those of closed-loop control, and different control modes can be selected according to different occasions and control requirements.
Furthermore, the main board and IGBT driving of the four-quadrant three-level explosion-proof frequency converter movement device are controlled by optical fibers. The inversion trigger signal adopts optical fiber isolation, the direct current loop adopts noninductive design, and the mining explosion-proof frequency converter laminated busbar is used.
Furthermore, the connection line between the main control board and the I/O board of the four-quadrant three-level explosion-proof frequency converter movement device is in an Ethernet connection mode, so that data transmission is convenient and concise, and the anti-interference capability is strong.
Furthermore, the four-quadrant three-level explosion-proof frequency converter movement device provides two paths of analog input interfaces capable of receiving 0-5V,0-10V,0-20mA and 4-20 mA; providing 8 paths of digital quantity input terminals for controlling forward and reverse rotation, stopping, resetting, terminal control, forced operation and speed preset value selection of the frequency converter; two paths of analog output interfaces capable of outputting 0-5V,0-10V,0-20mA and 4-20mA are provided for outputting the operation parameters of the frequency converter part.
Furthermore, the master control board adopts STM32 chip DSP28335, the I/O board adopts chip Lattice, the manual board adopts chip DSPIC33 can the fast control IGBT drive, trouble is ground and is judged, detected signal shows converter operation data in real time.
Furthermore, the four-quadrant three-level explosion-proof frequency converter core feedback unit adopts FF450R33 double-branch parallel IGBT, the inversion unit adopts FF660R17IGBT, and the main control board directly controls IGBT driving through optical fibers, so that real-time driving can be realized, and faults can be fed back and protected in time.
Furthermore, the application optimizes the control algorithm of the motor by adopting a three-level vector control technology, thereby improving the accuracy and dynamic performance of position and speed control. The vector control technology adopted by the four-quadrant three-level explosion-proof frequency converter movement can realize the same speed regulation characteristics as an asynchronous motor, a direct current motor, a synchronous motor, a permanent magnet motor roller and the like. For example, the four-quadrant movement device can be applied to a mining elevator, and problems cannot occur frequently due to high reliability of the device, so that potential safety hazards exist. The control method has the advantages that a perfect digital control function is required, the control precision is high, and the control of the rotating speed of the motor can be controlled because the rising and falling heights of the elevator are involved. The technical index requirements are high (for example, the starting torque is more than 2 times, the rated current is 150% or less and the rated current is 180% and the rated current is operated for 1 min for protection), and the starting torque, the low-frequency torque, the accelerating torque and the braking torque have strict requirements. The machine adopts an advanced STM32 chip to control a driving unit, current detection, temperature protection, communication test and the like. The system has perfect protection function and improves the reliability of the system. The device has small volume, high performance and relatively remarkable low-speed and high-torque performance.
Furthermore, the four-quadrant three-level explosion-proof frequency converter movement device provided by the application realizes quick response and accurate control of the torque of the explosion-proof motor through decoupling control of the flux current and the torque current of the alternating current motor, and can perform wide-range speed regulation operation with good control precision. In the aspect of function setting, the main chip can be used for inquiring fault signals, detecting 80 faults, enriching I/O terminals and stepless speed regulating functions, and meeting the requirements of various loads on transmission control. The keyboard is used by a professional to carry out parameter adjustment on the frequency converter, and parameter modification is protected by adopting an encryption mode.
Further, the mining frequency converter with the movement and the mining underground transformer substation with the frequency converter are provided. The transformer substation comprises a high-voltage part, the high-voltage part is provided with a high-voltage vacuum switch, and the high-voltage vacuum switch is controlled and protected by a high-voltage switch protection controller.
The application has the advantages of small volume, meeting the installation requirement on the mine and low failure rate. The four-quadrant three-level explosion-proof frequency converter movement device is used in explosion-proof frequency conversion, has the advantages of small volume, convenient installation, quick transmission of an internal purchase optical fiber driving signal, small interference, long power supply output distance by adopting an advanced three-level technology, and can meet the speed regulation requirements of various potential loads by adopting a function of controlling the rectifier frequency converter to operate in four quadrants, and the purpose of saving energy to the maximum extent can be achieved by converting regenerated energy of a motor into electric energy and sending the electric energy back to a power grid. Besides, the harmonic pollution of the power supply can be reduced, the power factor can be close to 1, the sine wave input reactor can be adopted to feed back to the power grid, and the pollution is reduced.
Compared with the prior art, the method has the following advantages:
the motor solves the driving and controlling problems of the motor of the explosion-proof variable frequency motor of the coal mine, the four-quadrant frequency converter has the advantages of small size of the machine core, low failure rate and less harmonic pollution to the power supply environment of the coal mine.
The advanced three-level vector control technology is adopted, and the control precision is high.
The optical fiber is adopted to drive the IGBT, signals are transmitted at a high speed, transmission delay is reduced, loop noise is reduced, voltages can be isolated, mutual interference is prevented, no additional radiation is generated, and the optical fiber is insensitive to EMI.
The high-power IGBT parallel connection mode is adopted, so that higher current density, uniform heat distribution, flexible layout and higher performance price are provided.
Compared with the prior art, the prior four-quadrant frequency converter mainly adopts an input reactor at the front section, an input filter and an LCL filtering mode. The application only adopts the input reactor, and the volume is reduced. The existing cable communication has high fault rate and is easy to fry, and the application adopts optical fiber communication signals to transmit quickly and reduces the fault rate. In the prior art, the single-two-level IGBT technology is mostly adopted, and the three-level technology is adopted, so that the output power supply distance is far.
Drawings
Fig. 1 is a schematic diagram of the movement structure of the explosion-proof frequency converter disclosed by the application.
Fig. 2 is a schematic diagram of a movement of another explosion-proof frequency converter according to the present disclosure.
Fig. 3 is a schematic diagram of a movement of another explosion-proof frequency converter according to the present disclosure.
Fig. 4 is a schematic structural diagram of a mining underground transformer station high-voltage vacuum switch protection controller with the movement of the application.
Description of the embodiments
The technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are merely examples and are not intended to limit the present application.
As shown in figures 1-3, the movement device of the four-quadrant three-level explosion-proof frequency converter disclosed by the application comprises a main input reactor, an input contactor, a charging resistor, a feedback unit, an inversion unit, a control unit, a hardware interface I/O, a communication interface unit, a filter capacitor, a laminated busbar, a keyboard display sheet metal part and the like.
The I/O board is connected with the main control board and communicates through the Ethernet. The main control board is connected with the feedback unit and the inversion unit in an optical fiber communication mode, the input three-phase power supply is connected with the input reactor, after the input reactor is passed through, each phase in the three-phase power supply is connected with a charging resistor through a switch and an input contactor respectively, the electric wires after the input contactor and the charging resistor are converged and then enter the feedback unit for carrying out, the feedback unit is connected with the filter capacitor and the inversion unit, and the inversion unit is connected with the motor. The power input by the power grid enters the feedback unit to be rectified and then is output to the inversion unit to operate the motor.
The part of the feedback unit connected with the filter capacitor is provided with a laminated busbar. The feedback unit of the frequency converter is connected with the filtering power supply by adopting the laminated busbar, so that the frequency converter has the effects of reducing stray inductance and peak voltage protection IGBT, is easy to install, is simple and compact in design, saves internal space and reduces cost.
The filter capacitor is a thin film capacitor. The thin film capacitor has the advantages of no polarity, high insulation resistance, excellent frequency characteristic (wide frequency response), small dielectric loss and the like. The thin film capacitors are connected in parallel by two groups after being connected in series. The series voltage increases and the capacity is unchanged. The parallel voltage is unchanged, the capacity is increased, and the filter energy storage effect of the frequency converter is met.
The input reactor has the functions of improving the power factor, weakening the impact current caused by transient spike voltage at the power supply side and weakening the influence of three-phase voltage unbalance.
The input contactor and the charging resistor not only reduce the impact current when being electrified, but also reduce the instantaneous voltage drop to the charging resistor, thereby avoiding the influence on the power grid and protecting the capacitor.
The feedback unit and the inversion unit are composed of IGBT and a driving board, a driving command is given by the main control board, and a power supply input by a power grid enters the feedback unit and is rectified to the inversion unit and then outputs three-phase power to the motor for operation.
The control unit, the hardware interface I/O is the control center, all detection loops are this issue command.
The keyboard has real-time display of the operation data of the frequency converter, and can adjust parameters.
The core program of the four-quadrant three-level explosion-proof frequency converter movement device is as follows: the rectifying part of the four-quadrant frequency converter adopts a double-branch IGBT circuit to realize bidirectional flow of current at the input side of the frequency converter. When the load of the four-quadrant frequency converter needs energy, the current at the input side of the frequency converter flows from the power grid to the frequency converter, namely the motor is in an electric state; when the load of the four-quadrant frequency converter has energy feedback, the input current of the frequency converter flows from the frequency converter to the power grid, namely, the motor is in a power generation state. The four-quadrant frequency converter adopts a digital control technology of a vector control algorithm to realize that the input current of the frequency converter is completely synchronous with the voltage of a power grid, and the phase of the input current is consistent with the phase of the voltage of the power grid in an electric state; the input current is in opposite phase to the grid voltage in the power generation state. The waveform of the input current always keeps good sine degree, the four-quadrant frequency converter realizes unit power factor, and the total distortion rate of the input current is less than 3%.
Furthermore, the application also discloses a mining underground mobile substation, which comprises a box body, wherein the box body is divided into a high-voltage chamber, a low-voltage chamber, a transformation chamber and a control chamber through a partition board, the high-voltage chamber is internally provided with high-voltage equipment, the low-voltage chamber is internally provided with low-voltage equipment, the transformation chamber is internally provided with a transformer, the control chamber is internally provided with control equipment, and the partition board is provided with terminals and cable channels for installing, connecting and communicating all parts of equipment.
The high-voltage equipment comprises a high-voltage switch cabinet, a high-voltage vacuum switch is arranged in the high-voltage switch cabinet, the high-voltage vacuum switch is protected by a high-voltage switch protection controller, and the high-voltage switch is used for conducting circuit breaking operation through a mining high-voltage vacuum switch composite circuit breaker.
As shown in fig. 4, the high voltage switch protection controller includes: the system comprises a main control module, an IO module, a communication module, a temperature module, a current and voltage sensor pre-detection module, a permanent magnet circuit breaker control module, a display module and an intrinsic safety power module; the main control module is connected with the display module, the main control module is connected with the communication module through optical fibers, and the communication module is respectively connected with the temperature module, the IO module, the first permanent magnet breaker control module and the second permanent magnet breaker control module through optical fibers, and the current and voltage sensor is a pre-detection module.
The main control module comprises a local control, a communication interface and a display interface; the IO module comprises input and output of switching value and input and output of analog value; the communication module is provided with an RS485, RJ45 and FC optical fiber interface; the temperature module is provided with multiple paths of temperature detection; the current-voltage sensor pre-detection module comprises direct current resistance detection of a constant current source generator; the permanent magnet breaker control module comprises capacitance detection, switching-on and switching-off control and position feedback; the display module comprises a 7-inch color liquid crystal configuration display screen; the intrinsic safety power supply module (B6) comprises 24V 'ib' intrinsic safety type protection switching power supply.
Specifically, the main control module specifically comprises 3 paths of current acquisition interfaces, 1 path of zero sequence current interfaces and 1 path of system voltage interfaces; the main control module uses 16 keys in a display module powered by the intrinsic safety power supply module to simulate keyboard input, sets local parameters and module parameters, sets communication parameters, sets parameters of a temperature module, sets parameters of an IO module, sets current and voltage protection, sets parameters of the temperature module and sets parameters of a permanent magnet breaker module.
The IO interface included in the IO module is as follows: the switching-off switch B1-1, the switching-on switch B1-2, the backup switch B1-3, the short circuit test switch B1-4, the overload test switch B1-5, the ready-to-complete switch B1-6, the breaker fault switch B1-7, the current sensor fault switch B1-8, the voltage sensor fault switch B1-9, the overtemperature switch B1-10, the other fault switches B1-11, and the three controller current sampling switches B1-12, B1-13 and B1-14, wherein the B1-12, B1-13 and B1-14 adopt 4-20mA analog current output, and the current sampling values of the controllers can be output in the form of analog quantity in proportion to provide data basis for the other controllers. The three external variable switches B1-15, B1-16 and B1-17 are also included, wherein the B1-15, B1-16 and B1-17 adopt 0-10V analog voltage input, and physical quantities such as water pressure, liquid level and air quantity introduced by an external transmitter can be output in the form of analog voltage.
The communication module is powered by the intrinsic safety power module and is connected between each module and the main control module through an optical fiber interface, and the communication module is connected with external upper computer equipment of the switch through RS485, RJ45 and FC optical fiber interfaces.
The temperature module comprises 8 independent temperature units, each temperature unit comprises a mutually independent temperature detection interface, 8 paths of temperatures are detected simultaneously through connection with the PT100, and an alarm threshold value of each path of temperature can be independently set through the main control module. The temperature data collected by the temperature module often generate certain noise due to the complex underground environment and the precision problem of the temperature sensor, and the cost of immediately alarming and stopping is too high for the situation. If it cannot be determined whether the noise is generated or the data acquisition is normal, the manual inspection mode is difficult and accidents are easy to cause in the underground environment. Thus, in order to solve the problem, the present application processes the collected temperature data, specifically, processes the historical data collected by combining with the temperature module, including: the temperature module selects the current temperature measurement and 9 continuous temperature measurements before the current temperature measurement for the detection temperature of each pathThe temperature data is obtained for 10 times and is recorded as data T 0 To T 9 . For each data T i Dividing by the maximum value in the 10 times temperature data to normalize and obtain T' i Subsequent calculation ofWherein->Is T' i Is a mean arithmetic value of (c). When M is greater than 0.01, the temperature data is temporarily set as the first abnormality, and the arithmetic average value of the 9 previous temperature data is temporarily used as the current temperature measurement value to carry out the next operation. If no abnormality occurs in the next temperature measurement, continuing to measure the temperature according to a normal program; if 3 anomalies appear continuously, it is determined that the 3 temperature data are not noise, and the arithmetic average value before is replaced by the real temperature measurement value. And if the alarm threshold is reached, immediately alarming.
The intrinsic safety power supply module comprises six paths of 24V power supply output interfaces, and is used for supplying power to a main control module, an IO module communication module, a temperature module, a display module, a current and voltage sensor pre-detection module and a permanent magnet circuit breaker control module, wherein the intrinsic safety level is 'ib'.
When the current and voltage sensor pre-detection module is at a separated position in the front-mounted isolation of the system, the keyboard is used for operation, the main control module controls the current and voltage sensor pre-detection module to sequentially test loop resistance of a secondary side loop of the current and voltage sensor, a test result is compared with parameters set by the main control module, the result is prompted by the display module, and if the result exceeds the range, an audible and visual alarm is sent.
After the main system is started, the permanent magnet circuit breaker module detects the capacity of the position switch and the capacity of the capacitor, compares the set parameters, prompts locking or preparation to be completed, and can carry out a closing request of the main circuit, which is provided by the controller, after the preparation is completed.
The low-voltage indoor unit comprises a low-voltage power distribution cabinet, wherein the low-voltage power distribution cabinet comprises an incoming line input part, a sub-control part and an output part, the output part is provided with a starter and a frequency converter, and the frequency converter adopts the three-level four-quadrant frequency conversion machine core and is matched with a multifunctional power distribution device for use.
The above applications are only some of the embodiments of the present application. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit of the application.
Claims (7)
1. The four-quadrant three-level explosion-proof frequency converter movement device is characterized by comprising a main control board, an I/O board, an input reactor, an input contactor, a charging resistor, a filter capacitor, a laminated busbar, a feedback unit, an inversion unit and a keyboard display sheet metal part;
the I/O board is connected with the main control board and communicates through the Ethernet; the main control board is connected with the feedback unit and the inversion unit in an optical fiber communication mode;
the three-phase input power supply is connected with the input reactor, after passing through the input reactor, one path of each phase in the three-phase input power supply is connected with one input contactor through a switch, and the other path of each phase is connected with one charging resistor through a switch; the current is converged into a feedback unit after passing through an input contactor and a charging resistor, the feedback unit is connected with a filter capacitor and an inversion unit, and the inversion unit is connected with a motor; after the current enters the feedback unit and is rectified, three-phase electricity is output to the motor through the inversion unit;
the rectification adopts a double IGBT circuit to realize the bidirectional flow of the current at the input side of the frequency converter; when the load of the four-quadrant three-level explosion-proof frequency converter needs energy, the current at the input side of the frequency converter flows from the power grid to the frequency converter, namely the motor is in an electric state; when the load of the four-quadrant three-level explosion-proof frequency converter has energy feedback, the input current of the frequency converter flows from the frequency converter to the power grid, namely, the motor is in a power generation state;
the four-quadrant three-level explosion-proof frequency converter movement device provides an analog input interface capable of receiving 0-5V,0-10V,0-20mA and 4-20 mA; providing 8 paths of digital quantity input terminals for controlling forward and reverse rotation, stopping, resetting, terminal control, forced operation and speed preset value selection of the frequency converter; providing an analog output interface capable of outputting 0-5V,0-10V,0-20mA and 4-20mA for outputting the operation parameters of the frequency converter part;
the feedback unit adopts FF450R33 double-branch parallel IGBT, the inversion unit adopts FF660R17IGBT, and the main control board directly controls IGBT drive through optical fiber;
the control mode of the four-quadrant three-level explosion-proof frequency converter movement device is speed open-loop vector control or speed closed-loop vector control, and the same speed regulation characteristic as that of an asynchronous motor and a synchronous motor is realized; the digital control technology of the vector control algorithm realizes complete synchronization of the input current of the frequency converter and the voltage of the power grid, and the phase of the input current is consistent with that of the voltage of the power grid in an electric state; the phase of the input current is opposite to the phase of the power grid voltage in the power generation state, so that the unit power factor is realized, and the total distortion rate of the input current is less than 3%;
the four-quadrant three-level anti-explosion frequency converter movement device is used for a mining four-quadrant three-level anti-explosion frequency converter, the mining four-quadrant three-level anti-explosion frequency converter is used for a mining underground transformer substation, and the transformer substation comprises a box body, wherein the box body is divided into a high-voltage chamber, a low-voltage chamber, a transformation chamber and a control chamber through a partition board; the low-voltage indoor low-voltage power distribution cabinet comprises a wire inlet input part, a sub-control part and an output part, wherein the output part is provided with a starter and a four-quadrant three-level explosion-proof frequency converter core, and the four-quadrant three-level explosion-proof frequency converter core is matched with a multifunctional power distribution device.
2. The four-quadrant three-level explosion-proof frequency converter movement device according to claim 1, wherein high-voltage equipment is installed in a high-voltage chamber of the mining underground substation, the high-voltage equipment comprises a high-voltage switch cabinet, a high-voltage vacuum switch is arranged in the high-voltage switch cabinet, the high-voltage vacuum switch is protected by a high-voltage switch protection controller, and the high-voltage switch is subjected to open-circuit operation by a mining high-voltage vacuum switch composite breaker; the high-voltage switch protection controller comprises a main control module, an IO module, a communication module, a temperature module, a current and voltage sensor pre-detection module, a permanent magnet circuit breaker control module, a display module and an intrinsic safety power module.
3. The four-quadrant three-level explosion-proof frequency converter movement device according to claim 2, wherein a laminated busbar is arranged at a portion of the feedback unit connected with the filter capacitor.
4. A four-quadrant three-level explosion-proof frequency converter movement device according to claim 3, wherein the feedback unit and the inversion unit are composed of IGBTs and a driving board, and receive a driving command issued by the main control board.
5. The four-quadrant three-level explosion-proof frequency converter movement device according to claim 4, wherein the filter capacitor is a thin film capacitor.
6. The four-quadrant three-level explosion-proof frequency converter movement device according to claim 5, wherein the frequency converter movement device operation command mode is keyboard control, and the keyboard can monitor frequency converter operation data in real time.
7. The four-quadrant three-level explosion-proof frequency converter movement device according to claim 6, wherein the IGBT and the driving plate are directly connected, and no connecting line exists between the IGBT and the driving plate.
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| CN217115931U (en) * | 2021-09-27 | 2022-08-02 | 西安中车永电电气有限公司 | Mining explosion-proof frequency converter core and explosion-proof frequency converter |
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Inventor after: Wang Xiaoming Inventor after: Liang Juntan Inventor after: Liu Dong Inventor after: Wu Kaiyang Inventor after: Qiu Zengyan Inventor after: Wang Yihong Inventor after: Ji Zhen Inventor before: Wang Xiaoming Inventor before: Liang Juntan Inventor before: Liu Dong Inventor before: Wu Kaiyang Inventor before: Qiu Zengyan Inventor before: Wang Yihong Inventor before: Ji Zhen |