CN110417332A - Flameproof intrinsically safe frequency converter and equipment - Google Patents
Flameproof intrinsically safe frequency converter and equipment Download PDFInfo
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- CN110417332A CN110417332A CN201910645161.9A CN201910645161A CN110417332A CN 110417332 A CN110417332 A CN 110417332A CN 201910645161 A CN201910645161 A CN 201910645161A CN 110417332 A CN110417332 A CN 110417332A
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 21
- 238000012544 monitoring process Methods 0.000 claims description 14
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 34
- 239000008367 deionised water Substances 0.000 description 17
- 229910021641 deionized water Inorganic materials 0.000 description 17
- 238000001816 cooling Methods 0.000 description 15
- 239000000498 cooling water Substances 0.000 description 12
- 238000010586 diagram Methods 0.000 description 9
- 238000012806 monitoring device Methods 0.000 description 6
- 238000002242 deionisation method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000005611 electricity Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
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- 230000033228 biological regulation Effects 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
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- 230000005389 magnetism Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
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- 238000012360 testing method Methods 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
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
- 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
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2089—Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
- H05K7/20927—Liquid coolant without phase change
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- Microelectronics & Electronic Packaging (AREA)
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- Thermal Sciences (AREA)
- Inverter Devices (AREA)
Abstract
The present invention provides a kind of Flameproof intrinsically safe frequency converter and equipment comprising the first filter unit is connect with electric network source；Rectified feedback unit is connect with first filter unit, and for carrying out the conversion of ac voltage signal and d. c. voltage signal, the rectified feedback unit is the topological structure of nested type midpoint guiding, and is five electrical level power modules；Inversion unit, for carrying out the conversion of d. c. voltage signal and ac voltage signal, the inversion unit is the topological structure of nested type midpoint guiding, and is five electrical level power modules；DC bus unit is connect, for transmitting d. c. voltage signal respectively with the rectified feedback unit and the inversion unit；Second filter unit is connect with the inversion unit and motor respectively；Controller is connect with first filter unit, rectified feedback unit, inversion unit and the second filter unit respectively, to control the operation of first filter unit, rectified feedback unit, inversion unit and the second filter unit.
Description
Technical field
The present invention relates to frequency converter field more particularly to a kind of Flameproof intrinsically safe frequency converter and equipment.
Background technique
As the key components equipment of large-scale gate trough-belt conveyer, such as high-power soft starter, need completely according to
Rely foreign countries' import, causes equipment investment to increase, after-sale service is difficult in place, the situation that standby redundancy is not easy to purchase.In addition, at present
For domestic large size gate trough-belt conveyer single machine driving power in 800kW or more, soft starting mode mostly uses motor direct
No Load Start cooperates CST or speed regulation type hydrodynamic coupler to carry out the scheme of belt conveyor soft start.Its shortcoming is that logical
It crosses CST or speed regulation type hydrodynamic coupler realizes that soft start-up scheme is larger to mechanical equipment and power grid impact, although basic energy
Meet the requirement of soft start, but is unable to control the speed of service, functional reliability, speed adjusting performance, power-balance performance, speed sync
Performance etc. cannot meet live requirement very well；And it is difficult in maintenance, use and maintenance cost is higher；The most important is mechanical
The presence of slippage leads to the rapid increase of motor its temperature under low speed operation, so that it is defeated to cannot achieve long range crossheading belt
The low speed of machine is sent to test band function.
Frequency conversion drive is in coal mine scraper machine, belt conveyor, winch, vertical shaft hoisting, coalcutter electrical haulage, blower and water pump
There is application etc. a variety of industrial and minerals.Frequency-conversion drive apparatus can be not only used for drag conveyor, belt conveyor, winch and vertical shaft hoisting etc.
Constant torque load, and can be used for the constant power loads such as underground coal mine blower, water pump.
The country applies to the large size of non-explosion-proof working face since 2004 using high-voltage frequency converter as soft starting device
On belt conveyor.The application achieves significant effect, through extensive utilization.But the electrical soft start of gate trough-belt conveyer
Only low-voltage explosion-proof frequency converter is available at present, with the progress of science and technology and the appearance of large-scale mine, is badly in need of developing big
Power high-voltage explosion-proof frequency converter realizes soft start.
Summary of the invention
The technical problem to be solved by the invention is to provide a kind of Flameproof intrinsically safe frequency converter and equipment.
To solve the above-mentioned problems, the present invention provides a kind of Flameproof intrinsically safe frequency converter comprising: the first filtering
Unit is connect with electric network source；Rectified feedback unit is connect, for carrying out ac voltage signal with first filter unit
With the conversion of d. c. voltage signal, the rectified feedback unit is the topological structure of nested type midpoint guiding, and is five level function
Rate module；Inversion unit, for carrying out the conversion of d. c. voltage signal and ac voltage signal, the inversion unit is nested type
The topological structure of midpoint guiding, and be five electrical level power modules；DC bus unit, respectively with the rectified feedback unit and institute
Inversion unit connection is stated, for transmitting d. c. voltage signal；Second filter unit connects with the inversion unit and motor respectively
It connects；Controller is connect with first filter unit, rectified feedback unit, inversion unit and the second filter unit respectively, with control
Make the operation of first filter unit, rectified feedback unit, inversion unit and the second filter unit.
Further, the rectified feedback unit goes out one five electricity by striding capacitance nesting by two three-level topology structures
Flat structure, two three-level topologies are in mirror symmetry by striding capacitance.
Further, the inversion unit goes out a five level knots by striding capacitance nesting by two three-level topology structures
Structure, two three-level topologies are in mirror symmetry by striding capacitance.
Further, the framework of the framework of the rectified feedback unit and the inversion unit passes through the DC bus unit
In mirror symmetry.
Further, the DC bus unit includes an at least DC capacitor.
Further, the frequency converter further includes preliminary filling piezoelectric transformer, the preliminary filling piezoelectric transformer and the DC bus list
Member connection, for being pre-charged to the DC bus unit.
Further, the frequency converter further includes power interface plate, first filter unit, rectified feedback unit, inversion
The monitoring information of unit and the second filter unit is connect by the power interface plate with the controller.
Further, the nominal input voltage of the Flameproof intrinsically safe frequency converter is 6kV, and rated output voltage is
6kV。
Further, the Flameproof intrinsically safe frequency converter further includes disengaging connecting line, and the disengaging connecting line uses
Push-in cable connector with insulation monitoring circuit.
The present invention also provides a kind of frequency conversion equipments comprising frequency converter as described above.
It is an advantage of the current invention that Flameproof intrinsically safe frequency converter of the present invention is 6KV/1900KWA voltage-source type mine
With Flameproof intrinsically safe converter plant, it can satisfy that large-scale gate trough-belt conveyer is soft to be opened/brake and adjust the speed to driving
The requirement of device, fills the domestic gaps, and Flameproof intrinsically safe frequency converter of the present invention is the output of five level PWMs, outlet side
Asynchronous motor can not only be connected, permasyn morot can be also connected.
It is a further advantage of the present invention that transless, without fuse, modularized design, it is small in size, light-weight.
Yet another advantage of the invention is that high pressure inlet-outlet line uses the push-in cable connector with insulation monitoring circuit,
It is that the cable connectors of other patterns does not have.
Detailed description of the invention
Fig. 1 is the structure diagram of a specific embodiment of Flameproof intrinsically safe frequency converter of the present invention；
Fig. 2 is the circuit diagram of a specific embodiment of Flameproof intrinsically safe frequency converter of the present invention；
Fig. 3 is the circuit diagram of a specific embodiment of the first filter unit of Flameproof intrinsically safe frequency converter；
Fig. 4 is a specific implementation of the rectified feedback unit and inversion unit of Flameproof intrinsically safe frequency converter of the present invention
The circuit diagram of mode；
Fig. 5 is the structural schematic diagram of a specific embodiment of frequency conversion equipment of the present invention.
Specific embodiment
With reference to the accompanying drawing to the specific embodiment of Flameproof intrinsically safe frequency converter provided by the invention and equipment
It elaborates.
One specific embodiment of present invention offer Flameproof intrinsically safe frequency converter.Fig. 1 is that the flame proof is simultaneous originally
The structure diagram of one specific embodiment of the safety-type frequency converter of matter, Fig. 2 are the Flameproof intrinsically safe frequency converters
The circuit diagram of one specific embodiment.Fig. 1 and Fig. 2 is please referred to, the Flameproof intrinsically safe frequency converter includes the first filter
Wave unit 10, rectified feedback unit 11, inversion unit 12, DC bus unit 13, the second filter unit 14 and controller 15.
One end of first filter unit 10 is connect with electric network source 20.The electric network source 20 is to the flame proof and originally
The safety-type frequency converter of matter provides voltage.The filter circuit that first filter unit 10 is made of capacitor, inductance and resistance.It is described
First filter unit 10 limits common-mode circuit, improves harmonic wave, so that the voltage for being input to the rectified feedback unit 11 meets
Standard.Compared to existing frequency converter, due to the presence of first filter unit 10, Flameproof intrinsically safe of the present invention becomes
Frequency device is not needed using transformer.Fig. 3 is a specific implementation of the first filter unit 10 of Flameproof intrinsically safe frequency converter
The circuit diagram of mode.Referring to Fig. 3, in this embodiment, first filter unit 10 is filtered by the just profound wave of a LCL
Wave device and common mode reactor composition, the former is so that it is met most of international standards in order to improve harmonic wave, the latter be in order to
Limit common mode current.The just profound wave filter of LCL includes inductance L1 and L2, D.C. resistance Rinf, capacitor C3；Common mode reactor includes
The just profound wave filter of common mode reactor inductance Lcm, LCL matches composition first filter unit by design with common mode reactor
10.First filter unit 10 cooperates rectified feedback unit 11, realizes the compensation of grid side dynamically track, and can both mend
Harmonic wave is mended idle again.
The rectified feedback unit 11 is connect with first filter unit 10.The rectified feedback unit 11 be based on
The Active Front End of IGBT is oriented to the topological structure of (Neutral Point Piloted, NPP) for nested type midpoint, and is five
Electrical level power module, to generate the output voltage of 5 level.The rectified feedback unit 11 is for carrying out d. c. voltage signal and handing over
Flow the conversion of voltage signal.Specifically, the rectified feedback unit 11 can convert the ac voltage signal of electric network source
For d. c. voltage signal, and the rectified feedback unit 11 can be to 20 feedback electric energy of electric network source.The inversion unit 12
For carrying out the conversion of d. c. voltage signal and ac voltage signal.Specifically, the inversion unit 12 can will be described whole
The d. c. voltage signal of stream feedback unit 11 is converted to ac voltage signal, and the ac voltage signal is passed to motor
30.The inversion unit 12 is the topological structure that nested type midpoint is oriented to (Neutral Point Piloted, NPP), and is five
Electrical level power module, to generate the output voltage of 5 level.
Further, referring to Fig. 4, in this embodiment, the rectified feedback unit 11 is opened up by two three level
Structure 110 is flutterred by nested five level blocks out of striding capacitance 111, two three-level topology structures 110 are by flying across electricity
Holding 111 is in mirror symmetry.The inversion unit 12 goes out one by 122 nesting of striding capacitance by two three-level topology structures 121
A five level block, two three-level topology structures 121 are in mirror symmetry by striding capacitance 122.
The application rectified feedback unit 11 and inversion unit 12 generate the output voltage of 5 level, compared to the output of 3 level
Voltage, for voltage waveform closer to sine wave, harmonic content is fewer, and the influence to performances such as the insulation of motor is smaller.It is described straight
Stream bus unit 13 is connect with the rectified feedback unit 11 and the inversion unit 12 respectively, for transmitting DC voltage letter
Number.The d. c. voltage signal that the rectified feedback unit 11 exports is transmitted to the inversion unit through the DC bus unit 12
12, and the input signal as the inversion unit 12.Further, the DC bus unit 12 includes an at least direct current
Hold, for example, the DC bus unit 12 is made of DC capacitor group.
Further, in this embodiment, further, the framework of the rectified feedback unit 11 and the inversion list
The framework of member 12 is in mirror symmetry by the DC bus unit 13.
Second filter unit 14 is connect with the inversion unit 12 and the motor 30 respectively.The inversion unit
The ac voltage signal of 12 outputs exports after second filter unit 14 filtering to the motor 30.Second filtering
Unit 14 is DV/DT filter, can reduce switching transients overvoltage to allow using longer motor cable and institute
State the connection of motor 30.The filter circuit that second filter unit 14 is made of capacitor, inductance and resistance.
The controller 15 is female with first filter unit 10, rectified feedback unit 11, inversion unit 12, direct current respectively
Line unit 13 and the connection of the second filter unit 14, to control first filter unit 10, rectified feedback unit 11, inversion unit
12, the operation of DC bus unit 13 and the second filter unit 14.The controller 15 is power electronic controller (PECe),
High performance vector controlled can be provided to calculate, it is ensured that the safe operation of frequency converter.
Further, the Flameproof intrinsically safe frequency converter further includes preliminary filling piezoelectric transformer 16.The precharge transformation
Device 16 is connect with the DC bus unit 13, simultaneous originally to avoid the flame proof for being pre-charged to DC bus unit 13
Surge current when the safety-type frequency converter of matter starts.
Further, the Flameproof intrinsically safe frequency converter further includes power interface plate 17.The power interface plate 17
Triggering/monitoring signal interface of all analog measurement interfaces, digital quantity measurement interface and IGBT is provided.Wherein, described
First filter unit 10, rectified feedback unit 11, inversion unit 12 and the second filter unit 14 monitoring information pass through the function
Rate interface board 17 is connect with the controller 15.In this embodiment, the power interface plate 17 includes rectified power
Interface board 171 and inverter power interface board 172.First filter unit 10 and the rectified feedback unit 11 are monitoring informations
It is connect by the rectified power interface board 171 with the controller 15, the inversion unit 12 and the second filter unit 14
Monitoring information is connect by the inverter power interface board 172 with the controller 15.
Further, the Flameproof intrinsically safe frequency converter further includes disengaging connecting line, and the disengaging connecting line uses
Push-in cable connector with insulation monitoring circuit, the connector is internal on the basis of having leader cable connector to be increased
Three insulation monitoring return cable connectors, will be single in high-tension cable quick coupling production for passing through insulation monitoring cable
The resistance of certain resistance value is concatenated between phase leader cable external shielding layer and insulation monitoring cable, is formed in DC loop and measure loop
Electric current, judge whether shielded layer is damaged outside leader cable by the variation of electric current, to play leader cable insulation protection
Effect.
Further, the nominal input voltage of the Flameproof intrinsically safe frequency converter is 6kV, and rated output voltage is
6kV, and the nominal input voltage of existing Flameproof intrinsically safe frequency converter is only 3.3kV, rated output voltage is only
3.3kV。
Flameproof intrinsically safe frequency converter of the present invention is four-quadrant frequency converter.Four-quadrant frequency converter refers to if become
Frequency device can satisfy the motoring condition of motor, and generating state operation can be also entered from motoring condition, is known as four-quadrant frequency conversion
Device.The course of work of Flameproof intrinsically safe frequency converter of the present invention is described as follows:
When the bridge that electric motor operation is when motoring condition, and the controlled members such as 11 inside IGBT of rectified feedback unit form
Which of certain period electric bridge formula circuit, the triggering timing by controlling controlled member just can control and can be connected, thus realize
Direct current is converted alternating current to, DC bus unit 13 is output to, then inversion unit 12 is obtained from DC bus unit 13
Direct current is simultaneously converted to all adjustable alternating current control ac motor of electric voltage frequency using IGBT inversion transformation technique by electric energy, at this time
Energy flows to motor via rectified feedback unit circuit and inversion unit circuit from electric network source, and Flameproof intrinsically safe becomes
Frequency device works in first, third quadrant.
When electric motor operation is when generating state, the energy that motor generates is fed back to energy by inversion unit
The energy d. c. voltage signal of DC bus unit 13 is reverse into same with power grid by DC bus unit 13, rectified feedback unit 11
Energy is fed back to power grid electricity after the first filter unit 10 filters out higher hamonic wave by the sinusoidal AC voltage signal for walking same-phase
Source reaches energy-efficient effect.Energy flows to electric network source by inversion unit 12, rectified feedback unit 11 by motor at this time,
Flameproof intrinsically safe frequency converter works in two, four-quadrant.
The bidirectional flow of energy may be implemented using low pressure IGBT power module for Flameproof intrinsically safe frequency converter of the present invention
It is dynamic, switching frequency and reliability is apparently higher than high pressure IGBT or IGCT used by similar product and its one side is adjustable
The power factor of input eliminates the harmonic pollution to power grid, the energy feedback that on the other hand can be generated motor to power grid,
Reach thorough energy-saving effect.
Flameproof intrinsically safe frequency converter of the present invention not only can be applied to asynchronous motor, but also to can be applied to permanent magnetism same
Motor is walked, and existing Flameproof intrinsically safe frequency converter is applicable only to asynchronous motor, and may not apply to permanent magnetism
Synchronous motor.
Flameproof intrinsically safe frequency converter of the present invention both can be applied to the gate trough-belt conveyer, big of requirement of explosion proof
Lane belt conveyor, and can be applied to the main slant belt conveyor with midway drive over long distances.
Flameproof intrinsically safe frequency converter of the present invention not only can be applied to this kind of constant torque load of belt conveyor, but also can
To be applied to blower, water pump class constant power load.
The present invention also provides a kind of frequency conversion equipments.The frequency conversion equipment uses above-mentioned Flameproof intrinsically safe frequency conversion
Device.Fig. 5 is the structural schematic diagram of a specific embodiment of frequency conversion equipment of the present invention.Referring to Fig. 5, the frequency conversion equipment includes
Frequency converter 300 and cooling system 310.The frequency converter 300 and the cooling system 310 may be provided at a shell, and (attached drawing is to draw
Show) in.The frequency converter 300 is above-mentioned Flameproof intrinsically safe frequency converter, is no longer described in detail.
The cooling system 310 includes a deionized water subsystem A, water cooling heat exchange subsystem B and air-cooled heat exchange
System C.
The deionized water subsystem A includes an ion-exchanger 311.The deionized water subsystem A forms deionization
Water, and deionization cooling water is inputted to the frequency converter.The deionized water subsystem A can dynamically remove the electricity dissolved in water removal
Matter ion is solved, guarantees that the conductivity of the cooling water in deionized water subsystem pipeline meets converter plant service requirement.
Further, the deionized water subsystem A further comprises expansion tank 312 and water replanishing device 313.The expansion
The pipeline connection of water tank 312 and the deionized water subsystem A, for carrying out pressure compensation to the deionized water subsystem A.
The pipeline connection of the water replanishing device 313 and deionized water subsystem A, is used for the deionized water subsystem A moisturizing.
The water cooling heat exchange subsystem B is arranged parallel with the air-cooled heat exchange subsystem C.From the frequency converter 300
The cooling water of discharge can be transmitted to by the water cooling heat exchange subsystem B or by the air-cooled heat exchange subsystem C
The deionized water subsystem A.That is, the water cooling heat exchange subsystem B and the deionized water subsystem A form the
One cooling cycle pipeline, the air-cooled heat exchange subsystem C and the deionized water subsystem A form the second cooling cycle pipe
Road.Wherein, coolant flow is schematically painted in the wind using dotted arrow at B sections of the water cooling heat exchange subsystem
Cold and hot switching subsystem C sections are schematically painted coolant flow to adopting for A sections in the deionized water subsystem using solid arrow
Schematically be painted with solid arrow coolant flow to.
The water cooling heat exchange subsystem B can be exchanged heat by a plate heat exchanger 314 with extraneous.From the frequency converter 300
The cooling water of discharge is circulated to the plate heat exchanger 314 by the road, and the cooling water is dissipated at the plate heat exchanger 314
The low cooling water of thermosetting temperature, the cooling water enter deionized water subsystem A through pipeline.
The air-cooled heat exchange subsystem C can be exchanged heat by an air radiator 315 with extraneous.From the frequency converter 300
The cooling water of discharge is circulated to air radiator 315 by the road, and the cooling water is by heat dissipation shape at the air radiator 315
At the low cooling water of temperature, which enters deionized water subsystem A through pipeline.Further, when environment temperature is less than or waits
The air-cooled heat exchange subsystem C can be selected when 30 DEG C.
Further, the cooling system 310 further includes a main line D.The deionized water subsystem A passes through the supervisor
Road D is connected to the frequency converter 310.The main line D includes an at least circulating pump 317.The circulating pump 317 with it is described go from
Sub- water subsystem A connection, to provide the conveying power of deionization cooling water.In this embodiment, the main line D packet
Two water circulating pumps 317 are included, two water circulating pumps 317 can be mutually as backup.
Further, the main line D is provided with an at least monitoring device 318.The monitoring device 318 being capable of real-time monitoring
Flow through the parameter of the cooling water of main line D.The monitoring device 318 includes but is not limited to pressure monitoring device, temperature monitoring dress
It sets, one of flow monitoring device and electrical conductivity monitoring device or a variety of.
Further, multiple switch 319 is provided on each pipeline of the cooling system 310, the switch 319 is opened
And close access and the disconnection that can control its corresponding segment pipeline.
The present invention provides a kind of drive of high-tension motor needed for can satisfy large-scale gate trough-belt conveyer 6kV, 1400kW
Dynamic high-power Flameproof and intrinsically safe high voltage frequency conversion equipment, promotes the formulation of professional standard, fills the domestic gaps.Frequency conversion of the present invention
Equipment is cooling using deionization, guarantees the cooling quality that module is run under long-time bad working environments, will not shape inside frequency converter
At fouling, the overall reliability and availability of equipment are improved, industrial application lasts a long time.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
Member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications also should be regarded as
Protection scope of the present invention.
Claims (10)
1. a kind of Flameproof intrinsically safe frequency converter characterized by comprising
First filter unit, connect with electric network source；
Rectified feedback unit is connect with first filter unit, for carrying out ac voltage signal and d. c. voltage signal
Conversion, the rectified feedback unit are the topological structure of nested type midpoint guiding, and are five electrical level power modules；
Inversion unit, for carrying out the conversion of d. c. voltage signal and ac voltage signal, the inversion unit is in nested type
The topological structure of point guiding, and be five electrical level power modules；
DC bus unit is connect with the rectified feedback unit and the inversion unit respectively, for transmitting DC voltage letter
Number；
Second filter unit is connect with the inversion unit and motor respectively；
Controller is connect with first filter unit, rectified feedback unit, inversion unit and the second filter unit respectively, with
Control the operation of first filter unit, rectified feedback unit, inversion unit and the second filter unit.
2. Flameproof intrinsically safe frequency converter according to claim 1, which is characterized in that the rectified feedback unit by
Two three-level topology structures go out five level blocks by striding capacitance nesting, and two three-level topologies pass through striding capacitance
In mirror symmetry.
3. Flameproof intrinsically safe frequency converter according to claim 1, which is characterized in that the inversion unit is by two
Three-level topology structure goes out five level blocks by striding capacitance nesting, and two three-level topologies are in mirror by striding capacitance
As symmetrical.
4. Flameproof intrinsically safe frequency converter according to claim 1, which is characterized in that the rectified feedback unit
The framework of framework and the inversion unit is in mirror symmetry by the DC bus unit.
5. Flameproof intrinsically safe frequency converter according to claim 1, which is characterized in that the DC bus unit packet
Include an at least DC capacitor.
6. Flameproof intrinsically safe frequency converter described in any one according to claim 1~5, which is characterized in that the change
Frequency device further includes preliminary filling piezoelectric transformer, and the preliminary filling piezoelectric transformer is connect with the DC bus unit, for the direct current
Bus unit precharge.
7. Flameproof intrinsically safe frequency converter described in any one according to claim 1~5, which is characterized in that the change
Frequency device further includes power interface plate, first filter unit, rectified feedback unit, inversion unit and the second filter unit prison
Control information is connect by the power interface plate with the controller.
8. Flameproof intrinsically safe frequency converter described in any one according to claim 1~5, which is characterized in that it is described every
The nominal input voltage of quick-fried intrinsic safety type frequency converter is 6kV, rated output voltage 6kV.
9. Flameproof intrinsically safe frequency converter described in any one according to claim 1~5, which is characterized in that it is described every
Quick-fried intrinsic safety type frequency converter further includes disengaging connecting line, and the disengaging connecting line is used with the push-in of insulation monitoring circuit
Cable connector.
10. a kind of frequency conversion equipment, which is characterized in that including frequency converter as claimed in any one of claims 1 to 9 wherein.
Priority Applications (1)
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