CN203800829U - Four-quadrant frequency converter - Google Patents
Four-quadrant frequency converter Download PDFInfo
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- CN203800829U CN203800829U CN201420106317.9U CN201420106317U CN203800829U CN 203800829 U CN203800829 U CN 203800829U CN 201420106317 U CN201420106317 U CN 201420106317U CN 203800829 U CN203800829 U CN 203800829U
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- frequency converter
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Abstract
The utility model belongs to the technical field of frequency converters, and provides a four-quadrant frequency converter. The frequency converter is arranged between a power grid and an induction motor and characterized in that a DC bus side of the frequency converter is provided with an energy feedback unit, a negative electrode end DC- of a DC bus of the frequency converter is electrically connected with a DC- end of the energy feedback unit, a positive electrode end DC+ of the DC bus of the frequency converter is electrically connected with a DC+ end of the energy feedback unit, three-phase alternating current of the energy feedback unit is outputted and connected to input sides R, S, T of the frequency converter, a terminal PE of the energy feedback unit is grounded reliably, the energy feedback device converts fed back electric energy into power frequency and transmits the power frequency to a power grid so as to carry out energy saving adjustment when bus voltage of the frequency converter is detected to reach a set value. The four-quadrant frequency converter has the advantages that the energy feedback device is externally connected, electric energy generated by the motor is added to the input end of the frequency converter through feedback, a reactor is additionally arranged, harmonic pollutions are avoided, the power factor is enabled to be improved greatly, and an efficient utilization rate of the electric energy is realized.
Description
Technical field
The utility model belongs to Frequency Converter Control technical field, relates to a kind of occasion in some fast braking, the four-quadrant frequency converter of using as occasions such as elevator, lifting, mining hoist, centrifuge, oil-field oil pumper, wind power grid-connected generatings.
Background technology
Variable-frequency control technique relates to a plurality of ambits such as electronics, electrician, information and control, adopting variable-frequency control technique is the important channel of saving energy and reduce the cost, improving control performance, improving product yield and quality, good effect and significant economic benefit in application, have been obtained, universal frequency converter is mostly voltage-type ac-dc-ac frequency converter, be that first three-phase alternating current is not controlled rectifier bridge by diode and obtained Rectified alternating current, again through electrochemical capacitor filtering voltage regulation, finally by passive inverter output voltage, alternating current that frequency is adjustable, to motor, power.Although this class frequency converter obtains extensive use in industry, but can not be directly used in the governing system that needs quick starting and braking and frequent forward and backward, as express elevator, mining elevator, rolling mill, large-sized gantry planer, winding mechanism tension system and machine tool chief axis drive system etc.Because this system requirements motor four quadrant running, when decelerating through motor, braking or band potential energy loading high weight are transferred, motor is in regenerative power generation state.Due to diode, control rectifier Energy Transfer is not irreversible, and the regenerative electric energy of generation is transferred on DC side filter capacitor, produces pump up voltage.And it is lower to take the full-control type device withstand voltage that GTR, IGBT be representative, too high pump up voltage likely damages switching device, electrochemical capacitor, even can destroy the insulation of motor, thereby threatens system safety work, and this has just limited the range of application of universal frequency converter; The regenerated energy producing in regenerative power generation state in order to solve motor, Siemens has been released the voltage-type ac-dc-ac frequency converter of motor four quadrant running, Japanese fuji company has also successfully developed power supply regenerative device, as RHR series, the serial power supply regenerative of FRENIC unit, it separates active inversion unit from frequency converter, directly, as a peripheral unit of frequency converter, can be parallel to the DC side of frequency converter, by Way of Regenerating Energy Feedback in electrical network.Ubiquitous problem is that these devices are expensive, adds some products very high to the requirement of electrical network, is not suitable for the national conditions of China.The domestic dynamic braking mode that mostly adopts in Small And Medium Capacity system, the method by built-in or additional brake resistance by power consumption in Power Resistor, realize the four quadrant running of motor, although the method is simple, but there is following critical defect: (1) wastes energy, reduced the efficiency of system; (2) resistance heating is serious, and other parts that affect system are normally worked; (3) simple dynamic braking can not suppress the pump up voltage that fast braking produces sometimes in time, has limited the raising (braking moment is large, speed-regulating range width, dynamic property is good) of braking ability.
Summary of the invention
Technical problem to be solved in the utility model is the present situation for prior art, and provide a kind of four-quadrant frequency converter, make the features such as universal frequency converter frequency and voltage is controlled, easy to operate, and can realize the recycling that motor braking is produced to electric energy, power factor significantly improves, and finally reaches desirable energy-saving effect.
The utility model solves the problems of the technologies described above adopted technical scheme: a kind of four-quadrant frequency converter, frequency converter is arranged between electrical network and induction machine, it is characterized in that, in frequency changer direct current bus side, be provided with for real time monitoring and control bus and make four-quadrant stable operation reach energy-conservation energy feedback unit, the negative pole end DC-of DC bus and the DC-of energy feedback unit electrical connection on described frequency converter, DC+ on frequency converter and the electrical connection of the DC+ of energy feedback unit end, the three-phase alternating current output of energy feedback unit is attempted by the input side R of frequency converter, S, T, the terminals P E terminal reliable ground of energy feedback unit, when described energy back feed device detects frequency converter busbar voltage and reaches its set point, just feedback electric energy can be converted to work frequency is sent to electrical network and carries out energy-conservation adjusting.
The measure of taking for optimization such scheme specifically comprises:
In above-mentioned a kind of four-quadrant frequency converter, the electrical design of described frequency converter partly comprises the rectifying part being electrically connected to successively, charge circuit, filtering part, Converting Unit, control loop part and man-machine interface part, described rectifying part comprise six diodes and for by industrial frequency AC electric rectification for pulsation direct current, for subordinate's circuit, described charge circuit is for the inhibition of impact electric current, buffering and live action, described filtering part is for becoming mild by the direct current of pulsation, eliminate peak voltage, Converting Unit is converted to direct current alternating current output again, complete the action of whole major loop, control loop partly comprises isolation drive plate, Switching Power Supply plate and master control borad, control loop partly carries out the effect of regulation and control comprehensively for playing in whole process for major loop, described isolation drive plate is used for exporting corresponding SPWM pulse, thereby control the switching rate of IGBT gate pole, reach the object of regulation output voltage and output frequency, described Switching Power Supply plate is used for reaching to voltage, the real-time control of frequency, master control borad is auxiliary each input signal to be processed for computing and protective circuit, computing, described man-machine interface is partly mainly used in the setting of user to its inner parameter, change and supervision and every warning and fault output display.
In above-mentioned a kind of four-quadrant frequency converter, described charge circuit is comprised of charging resistor and contactor, charging resistor is for charging to storage capacitor at powered on moment, play inhibition and the cushioning effect of impact electric current, contactor adhesive then after charging, by charging resistor short circuit, complete powering on of frequency converter.
In above-mentioned a kind of four-quadrant frequency converter, described filtering part adopts big capacity electrolyte capacitor group and for being responsible for, the direct current of pulsation is become gently, eliminates peak voltage.
In above-mentioned a kind of four-quadrant frequency converter, the electrical design of described energy feedback unit is partly included as Converting Unit, DC filtering part, ac filter part and energy feedback power plate portion, the DC inversion of described energy feedback unit is partly used for changing direct current into amplitude adjustable and frequency with the identical process of electrical network, the filtering part of described energy feedback unit adopts big capacity electrolyte capacitor, and for the direct current of pulsation is become and eliminates gently peak current simultaneously, the ac filter of described energy feedback unit is partly processed for LC filtering, prevent humorous wave interference, energy feedback power plate is mainly by drive circuit, Switching Power Supply, protective circuit forms, complete the control in whole service process, regulate and warning function.
In above-mentioned a kind of four-quadrant frequency converter, the ac filter part of described energy feedback unit is added in by out put reactor, A.C. contactor and ac filter electric capacity in the three-phase output of feedback unit and forms, and processes for LC filtering the humorous wave interference electrical network that prevents that feedback from producing.
In above-mentioned a kind of four-quadrant frequency converter, the Converting Unit of described energy feedback unit is comprised of inversion module, and is converted to the adjustable and frequency of voltage magnitude with the identical alternating current output of grid side for realizing direct current.
Compared with prior art, the utility model has the advantage of:
1) this scheme adopts open by design theory to design, and frequency converter does not have shell cabinet, therefore can reduce production cost and Installation Flexibility is higher;
2) can realize the soft start of motor, reduce instantaneous large-current to the impact of motor and eliminate the huge fluctuation to electrical network;
3) multiple protection functions and the remote monitoring function such as the overvoltage of frequency converter, overcurrent, overload, short circuit, thus stability, the reliability of motor operation are guaranteed;
4) the DC bus end of frequency converter adds energy back feed device and makes frequency converter in four quadrant running, can avoid the heating serious problems that adopt brake resistance to bring, can avoid brake resistance sometimes can not suppress in time the problems such as pump up voltage that fast braking produces, greatly improve stability, the reliability of system;
5) external energy back feed device, the electric energy that motor is produced is added to by feedback again, and the input of frequency converter, installs reactor additional, has avoided harmonic pollution, and power factor is significantly promoted, and has realized the efficient utilance of electric energy.
Accompanying drawing explanation
Fig. 1 is the electrical connection diagram of this frequency converter part;
Fig. 2 is the electrical connection diagram of this energy feedback unit;
Fig. 3 is the overall structure electrical connection diagram of this frequency converter and energy feedback unit.
Embodiment
Be below specific embodiment of the utility model by reference to the accompanying drawings, the technical solution of the utility model is further described, but the utility model be not limited to these embodiment.
In figure, rectifying part 1; Contactor 2; Charging resistor 3; Electrochemical capacitor 4; Converting Unit 5; Switching Power Supply plate 6; Master control borad 7; Fuse 8; Big capacity electrolyte capacitor 9; Energy feedback power plate 10; Inversion module 11; Hall element 12; AC reactor 13; Ac filter electric capacity 14; A.C. contactor 15; Frequency converter 16; Energy feedback unit 17; Isolation drive plate 18.
As shown in Figure 3, this four-quadrant frequency converter, frequency converter 16 is arranged between electrical network and induction machine, in frequency converter 16 DC bus sides, be provided with for real time monitoring and control bus and make four-quadrant stable operation reach energy-conservation energy feedback unit 17, the negative pole end DC-of DC bus and the DC-of energy feedback unit 17 electrical connection on frequency converter 16, the DC+ end electrical connection of the DC+ on frequency converter 16 and energy feedback unit 17, the three-phase alternating current output of energy feedback unit 17 is attempted by the input side R of frequency converter 16, S, T, the terminals P E terminal reliable ground of energy feedback unit 17, when described energy back feed device detects frequency converter 16 busbar voltages and reaches its set point, just feedback electric energy can be converted to work frequency is sent to electrical network and carries out energy-conservation adjusting, when motor is operated in generating state, the energy that motor produces feeds back to DC bus by the diode of frequency converter inversion side, when DC bus-bar voltage surpasses certain value, energy feedback control section starts, by DC inversion, it is interchange, by controlling inverter voltage phase place and amplitude, energy feedback is arrived to electrical network, reach energy-conservation effect.
Specifically, frequency converter 16 adopts open by design for the electric component of frequency converter 16 is fixed on radiator, and do not have independently shell to cover, structural entity adopts wall-hanging design, the one, the electrical design of frequency converter 16, the 2nd, the electrical design of energy feedback, the 3rd, electrical connection between the two.
The electrical design of frequency converter 16 partly comprises rectifying part 1, charge circuit, filtering part, Converting Unit 15, control loop part and the man-machine interface part being electrically connected to successively.
Rectifying part 1 comprise six diodes and for by industrial frequency AC electric rectification for pulsation direct current, for subordinate's circuit, charge circuit is comprised of charging resistor 3 and contactor 2, charging resistor 3 is for charging to storage capacitor at powered on moment, play inhibition and the cushioning effect of impact electric current, after charging, contactor 2 meeting adhesives then, by charging resistor 3 short circuits, complete powering on of frequency converter 16.
Filtering part adopts 4 groups of electrochemical capacitors and for being responsible for, the direct current of pulsation is become to mild, eliminate peak voltage, Converting Unit 15 is converted to direct current alternating current output again, complete the action of whole major loop, control loop partly comprises isolation drive plate 18, Switching Power Supply plate 6 and master control borad 7, control loop partly carries out the effect of regulation and control comprehensively for playing in whole process for major loop, described isolation drive plate 18 is for exporting corresponding SPWM pulse, thereby control the switching rate of IGBT gate pole, reach the object of regulation output voltage and output frequency, Switching Power Supply plate 6 is for reaching voltage, the real-time control of frequency, master control borad 7 is auxiliary each input signal to be processed for computing and protective circuit, computing, described man-machine interface is partly mainly used in the setting of user to its inner parameter, change and supervision and every warning and fault output display.
The electrical design of energy feedback unit 17 is partly included as Converting Unit, DC filtering part, ac filter part and energy feedback power plate 10 parts, and the Converting Unit of energy feedback unit 17 is used for changing direct current into amplitude adjustable and frequency with the identical process of electrical network.
The DC filtering of energy feedback unit 17 partly adopts big capacity electrolyte capacitor 9, and for the direct current of pulsation is become and eliminates gently peak current simultaneously, the ac filter of described energy feedback unit 17 is partly processed for LC filtering, prevent humorous wave interference, the ac filter part of energy feedback unit 17 is added in by out put reactor, A.C. contactor 15 and ac filter electric capacity 14 in the three-phase output of feedback unit and forms, and processes for LC filtering the humorous wave interference electrical network that prevents that feedback from producing.
The Converting Unit of described energy feedback unit 17 is comprised of inversion module 11, and is converted to the adjustable and frequency of voltage magnitude with the identical alternating current output of grid side for realizing direct current
The power panel of energy feedback is mainly comprised of drive circuit, switching power circuit, testing circuit, protective circuit; complete control, adjusting and warning function in whole service process; energy feedback unit 17 adopts devices at full hardware design concept; real-time tracking busbar voltage and electrical network phase frequency; current closed-loop is processed; thereby control the switching rate of IGBT gate pole, make the universal frequency converter 16 can be at four quadrant running.
Wherein, testing circuit mainly carries out amplification and the comparison of signal by operational amplifier and auxiliary circuit to sampling resistor, realize multinomial defencive function, wherein, switching power circuit is mainly by 3844 chips, switching tube, transformer and other voltage stabilizings and calibration circuit form, be responsible for the normal operation of main control loop and outside high speed cooling fan, wherein, control circuit is mainly in calculation process and every analog quantity of signal, in the output of switching value and temperature detection, complete every control function of frequency converter 16, wherein, man-machine interface is responsible for the setting of user's parameter in frequency converter 16 operations or shutdown, change and supervision, wherein, display section is the indication operation that light-emitting diode forms, feedback, the three groups of operating states of reporting to the police.
Whole operation principle of the present utility model is as follows:
As shown in Figure 1, when input, survey and pass into after three-phase alternating current, the rectifying part 1 of frequency converter 16, by the rectified action of six diodes, is converted to alternating current the direct current of pulsation, then gives electrochemical capacitor 4 chargings by charging resistor 3, electrochemical capacitor 4 starts to carry out energy storage, after to be charged completing, contactor 2 receives the adhesive signal of master control borad 7, by charging resistor 3 short circuits, now, just complete the action that powers on of frequency converter 16.Afterwards, filtering part carries out flat ripple to direct current, Converting Unit is converted to size and the adjustable alternating current output of frequency by direct current, Switching Power Supply plate 6 and master control borad 7 play for major loop and carry out the effect of regulation and control comprehensively in whole process, wherein Switching Power Supply plate 6 can pass through drive circuit, Switching Power Supply part, testing circuit, protective circuits etc. reach voltage, the real-time control of frequency, wherein master control borad 7 can be take DSP main control chip as core, other computings and protective circuit are auxiliary each input signal to be processed, computing, thereby reach the object that realizes every control effect.
In embodiment as shown in Figure 2, when motor is operated in generating state, the electric energy producing feeds back to frequency converter 16 DC bus places by the fly-wheel diode of frequency converter 16 inversion sides, first through overcurrent fuse 8, give the DC bus of feedback unit, to also can protect frequency converter 16 sides when feedback unit fault; Pass through again the further filtering of big capacity electrolyte capacitor 9; When the DC bus-bar voltage that feedback unit detected when energy feedback power plate 10 surpasses A.C. contactor 15 adhesive set-point, A.C. contactor 15 will adhesive, and now whole system will enter feedback prison and shows state; The DC bus-bar voltage that feedback unit further detected when energy feedback power plate 10 surpasses the voltage of feedback set-point and grid side when normal, the drive circuit of energy feedback power plate 10 will be sent out control impuls to inversion module 11, to realize direct current, be converted to the adjustable and frequency of voltage magnitude with the identical alternating current output of grid side, Hall element 12 will detect the electric current after inversion in real time, and current value is fed back to energy feedback power plate 10 carries out closed-loop control; AC reactor 13 and ac filter electric capacity 14 form LC filtering system, prevent the humorous wave interference electrical network that feedback produces.Its inner testing circuit completes protection and the warning functions such as its overcurrent, overvoltage, overload, short circuit.
In embodiment as shown in Figure 3, the negative pole end DC-of DC bus and the DC-of energy feedback unit 17 electrical connection on frequency converter 16; P end electrical connection on DC+ and frequency converter 16, it is the positive terminal of DC bus; The three-phase alternating current output of energy feedback is attempted by input side R, S, the T terminal of frequency converter 16; PE terminal reliable ground.When energy feedback unit 17 detects frequency converter 16 busbar voltages and reaches its set point, just can pass through the operation principle of figure bis-illustrated embodiments, feedback electric energy is converted to work frequency and is sent to electrical network, finally reach considerable energy-saving effect.
Specific embodiment described herein is only to the explanation for example of the utility model spirit.The utility model person of ordinary skill in the field can make various modifications or supplements or adopt similar mode to substitute described specific embodiment, but can't depart from the defined scope of spirit of the present utility model.
Claims (7)
1. a four-quadrant frequency converter, frequency converter is arranged between electrical network and induction machine, it is characterized in that, in frequency changer direct current bus side, be provided with for real time monitoring and control bus and make four-quadrant stable operation reach energy-conservation energy feedback unit, the negative pole end DC-of DC bus and the DC-of energy feedback unit electrical connection on described frequency converter, DC+ on frequency converter and the electrical connection of the DC+ of energy feedback unit end, the three-phase alternating current output of energy feedback unit is attempted by the input side R of frequency converter, S, T, the terminals P E terminal reliable ground of energy feedback unit, when described energy back feed device detects frequency converter busbar voltage and reaches its set point, just feedback electric energy can be converted to work frequency is sent to electrical network and carries out energy-conservation adjusting.
2. a kind of four-quadrant frequency converter according to claim 1, it is characterized in that, the electrical design of described frequency converter partly comprises the rectifying part being electrically connected to successively, charge circuit, filtering part, Converting Unit, control loop part and man-machine interface part, described rectifying part comprise six diodes and for by industrial frequency AC electric rectification for pulsation direct current, for subordinate's circuit, described charge circuit is for the inhibition of impact electric current, buffering and live action, described filtering part is for becoming mild by the direct current of pulsation, eliminate peak voltage, Converting Unit is converted to direct current alternating current output again, complete the action of whole major loop, control loop partly comprises isolation drive plate, Switching Power Supply plate and master control borad, control loop partly carries out the effect of regulation and control comprehensively for playing in whole process for major loop, described isolation drive plate is used for exporting corresponding SPWM pulse, thereby control the switching rate of IGBT gate pole, reach the object of regulation output voltage and output frequency, described Switching Power Supply plate is used for reaching to voltage, the real-time control of frequency, master control borad is auxiliary each input signal to be processed for computing and protective circuit, computing, described man-machine interface is partly mainly used in the setting of user to its inner parameter, change and supervision and every warning and fault output display.
3. a kind of four-quadrant frequency converter according to claim 2, it is characterized in that, described charge circuit is comprised of charging resistor and contactor, charging resistor is for charging to storage capacitor at powered on moment, play inhibition and the cushioning effect of impact electric current, contactor adhesive then after charging, by charging resistor short circuit, completes powering on of frequency converter.
4. a kind of four-quadrant frequency converter according to claim 2, is characterized in that, described filtering part adopts big capacity electrolyte capacitor group and for being responsible for, the direct current of pulsation become gently, eliminates peak voltage.
5. a kind of four-quadrant frequency converter according to claim 1, it is characterized in that, the electrical design of described energy feedback unit is partly included as Converting Unit, DC filtering part, ac filter part and energy feedback power plate portion, the DC inversion of described energy feedback unit is partly used for changing direct current into amplitude adjustable and frequency with the identical process of electrical network, the filtering part of described energy feedback unit adopts big capacity electrolyte capacitor, and for the direct current of pulsation is become and eliminates gently peak current simultaneously, the ac filter of described energy feedback unit is partly processed for LC filtering, prevent humorous wave interference, energy feedback power plate is mainly by drive circuit, Switching Power Supply, protective circuit forms, complete the control in whole service process, regulate and warning function.
6. a kind of four-quadrant frequency converter according to claim 5, it is characterized in that, the ac filter part of described energy feedback unit is added in by out put reactor, A.C. contactor and ac filter electric capacity in the three-phase output of feedback unit and forms, and processes for LC filtering the humorous wave interference electrical network that prevents that feedback from producing.
7. a kind of four-quadrant frequency converter according to claim 5, is characterized in that, the Converting Unit of described energy feedback unit is comprised of inversion module, and is converted to the adjustable and frequency of voltage magnitude with the identical alternating current output of grid side for realizing direct current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420106317.9U CN203800829U (en) | 2014-03-10 | 2014-03-10 | Four-quadrant frequency converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420106317.9U CN203800829U (en) | 2014-03-10 | 2014-03-10 | Four-quadrant frequency converter |
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| Publication Number | Publication Date |
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| CN203800829U true CN203800829U (en) | 2014-08-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420106317.9U Expired - Fee Related CN203800829U (en) | 2014-03-10 | 2014-03-10 | Four-quadrant frequency converter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109981026A (en) * | 2019-04-20 | 2019-07-05 | 江苏驭创高铁节能科技有限公司 | A kind of oil-well rig adjustable four-quadrant frequency converter with voltage |
-
2014
- 2014-03-10 CN CN201420106317.9U patent/CN203800829U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109981026A (en) * | 2019-04-20 | 2019-07-05 | 江苏驭创高铁节能科技有限公司 | A kind of oil-well rig adjustable four-quadrant frequency converter with voltage |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: ZHEJIANG XINFULING ELECTRIC CO., LTD. Free format text: FORMER NAME: TAIZHOU FULING ELECTRIC CO., LTD. |
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| CP01 | Change in the name or title of a patent holder |
Address after: 317519, 2, North Ring Road, Wenling City, Zhejiang, Taizhou Patentee after: ZHEJIANG NEW FOLINN ELECTRIC CO.,LTD. Address before: 317519, 2, North Ring Road, Wenling City, Zhejiang, Taizhou Patentee before: TAIZHOU FULING ELECTRICAL Co.,Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140827 |
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| CF01 | Termination of patent right due to non-payment of annual fee |