CN117039801A - Phase-failure prevention power supply of frequency converter - Google Patents
Phase-failure prevention power supply of frequency converter Download PDFInfo
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- CN117039801A CN117039801A CN202311009208.5A CN202311009208A CN117039801A CN 117039801 A CN117039801 A CN 117039801A CN 202311009208 A CN202311009208 A CN 202311009208A CN 117039801 A CN117039801 A CN 117039801A
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- 239000003990 capacitor Substances 0.000 claims abstract description 52
- 238000009499 grossing Methods 0.000 claims description 22
- 238000007599 discharging Methods 0.000 claims description 17
- 230000000694 effects Effects 0.000 abstract description 7
- 238000000034 method Methods 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
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- 238000009434 installation Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/09—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against over-voltage; against reduction of voltage; against phase interruption
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Abstract
The application provides a phase-loss prevention power supply of a frequency converter, which comprises a first three-phase rectifier bridge, a second three-phase rectifier bridge, a frequency converter control part, a first flat wave part and a second flat wave part, wherein the output ends of the first three-phase rectifier bridge and the second three-phase rectifier bridge are respectively connected with a first direct current bus and a second direct current bus; the frequency converter control part is used for being connected with an external load; the first flat wave part comprises a first flat wave capacitor, a first charging diode and a second flat wave capacitor which are sequentially connected, and the second flat wave part comprises a third flat wave capacitor, a second charging diode and a fourth flat wave capacitor which are sequentially connected. The frequency converter phase-failure prevention power supply can realize full normal operation of two groups of alternating current power supplies after any three phases are completed, and the two groups of alternating current power supplies are input together to supply power on the direct current side of the rectifier bridge in a loop closing way, so that even if any one group of alternating current power supplies are phase-failure, the voltage of a direct current bus cannot be influenced as long as the other group of alternating current power supplies with the same phase are normal, and the effect of preventing the phase failure is achieved.
Description
Technical Field
The application relates to a power supply of power equipment, in particular to an anti-phase-failure power supply of a frequency converter.
Background
The phase loss caused by reclosing under the conditions of power grid fault, planned power failure, emergency repair and the like is an important influence factor influencing the power supply quality, and is mainly caused by short-time power loss of the power grid fault, the reclosing and the like. In the current generation, equipment enterprises largely adopt precision power equipment such as numerical control machine tools, direct current speed regulating equipment and the like, the equipment relies on a power electronic technology, although the equipment has better intelligence and energy conservation, most of the equipment is sensitive to power grid fluctuation, the highest abnormality of the power grid fluctuation is instantaneous open phase, and because the power electronic equipment is internally provided with no inertial energy storage element, alternating current is directly changed into direct current and then is inverted into a required PWM signal to drive a motor, if the voltage of an alternating current input side fluctuates or is open phase, the voltage of a direct current bus side drops, the microcomputer of a control unit is restarted, the driving motor is stopped, and even serious consequences of production line outage can be caused. Therefore, the power supply quality of the intelligent general equipment enterprises has more strict requirements on the power supply continuity and stability.
Under the current large power grid pattern, the voltage fluctuation of the whole grid can be caused by any point fault of the grid due to the reduction of the short-circuit impedance of the power grid, the problem of short-time phase loss of the power grid is serious in summer due to unavoidable lightning trip single-phase reclosing, and a special phase loss prevention technology must be researched for modern equipment enterprises with extremely high intelligent degree so as to better adapt to the power supply requirements in the high-end manufacturing field.
Disclosure of Invention
The application aims to provide a phase-failure prevention power supply of a frequency converter, which has the advantages of strong phase-failure prevention capability and convenience in adding on the existing line.
In order to achieve the above object, the present application provides a phase-loss prevention power supply for a frequency converter, comprising:
the system comprises a first direct current bus, a second direct current bus and a zero line;
the input end of the first three-phase rectifier bridge is connected with an external three-phase input end, and the output end of the first three-phase rectifier bridge is respectively connected with the first direct current bus and the second direct current bus;
the input end of the second three-phase rectifier bridge is connected with an external three-phase input end, the first three-phase rectifier bridge and the second three-phase rectifier bridge are connected with different external three-phase input ends, and the output end of the second three-phase rectifier bridge is respectively connected with the first direct current bus and the second direct current bus;
the input end of the frequency converter control part is respectively connected with the first direct current bus and the second direct current bus, and the output end of the frequency converter control part is used for being connected with an external load;
the first flat wave part comprises a first flat wave capacitor, a first charging diode and a second flat wave capacitor which are sequentially connected, wherein the positive electrode and the negative electrode of the first charging diode are respectively connected with the first direct current bus and the zero line, a first discharging diode is arranged between the negative electrode of the first charging diode and the first direct current bus, the negative electrode of the first discharging diode is connected with the first direct current bus, a second discharging diode is arranged between the positive electrode of the first charging diode and the zero line, and the positive electrode of the second discharging diode is connected with the zero line;
the second flat wave part is arranged between the second direct current bus and the zero line, the second flat wave part comprises a third flat wave capacitor, a second charging diode and a fourth flat wave capacitor which are sequentially connected, the anode and the cathode of the second charging diode are respectively connected with the zero line and the second direct current bus, a third discharging diode is further arranged between the cathode of the second charging diode and the zero line, the cathode of the third discharging diode is connected with the zero line, a fourth discharging diode is further arranged between the second charging diode and the zero line, and the anode of the fourth discharging diode is connected with the second direct current bus.
Preferably, a bus smoothing capacitor is connected in series between the first dc bus and the second dc bus, and the bus smoothing capacitor is connected in parallel with the inverter control unit.
Preferably, a phase line reactor is connected in series at each connection position of the first three-phase rectifier bridge and the external three-phase input end.
Preferably, a phase line reactor is connected in series at each connection position of the second three-phase rectifier bridge and the external three-phase input end.
Preferably, the zero line is connected with a zero line reactor in series.
Preferably, the capacitance values of the first flat wave capacitor, the second flat wave capacitor, the third flat wave capacitor and the fourth flat wave capacitor are the same.
Preferably, the first charging diode and the second charging diode are the same diode.
Preferably, the first discharge diode, the second discharge diode, the third discharge diode, and the fourth discharge diode are the same diode.
In summary, compared with the prior art, the anti-phase-failure power supply for the frequency converter provided by the application has the following beneficial effects:
the frequency converter phase-failure prevention power supply can realize full normal operation of two groups of alternating current power supplies after any three phases are completed, only one phase is intact, and the low power can be maintained to operate, and by adopting the common input of the two groups of alternating current power supplies, the direct current side of the rectifier bridge is supplied with power by closing a loop, even if any one group of alternating current power supplies are in phase failure, the voltages of a first direct current bus and a second direct current bus can not be influenced as long as the other group of alternating current power supplies in the same phase are normal, the effect of preventing the phase failure is achieved, and because of the unidirectional conductive isolation effect of the three-phase rectifier bridge, the two groups of alternating current power supplies can not generate the problem of non-synchronous loop closing, so that better phase failure prevention is realized. When only one phase of one of the two groups of power supplies is intact under adverse conditions, the application utilizes the zero phase and the capacitor diode group to form two groups of serial charge and parallel discharge circuits, can play a half-wave voltage doubling rectifying role, and plays an excellent phase failure prevention role. In addition, the anti-phase-failure power supply of the frequency converter only needs to change the rectifying part of the alternating current side of the existing frequency converter, does not change the core part of the frequency converter, is convenient to install on the existing circuit, and can be directly installed on the direct current bus of the alternating current input side of the existing frequency converter.
Drawings
Fig. 1 is a schematic diagram of connection of elements of an anti-phase-failure power supply of a frequency converter according to the present application.
Reference numerals illustrate:
zero line reactor 1
Phase line reactor 2
First three-phase rectifier bridge 3
Second three-phase rectifier bridge 4
First flat wave capacitor 5
Second smoothing capacitor 6
Third smoothing capacitor 7
Fourth smoothing capacitor 8
First discharge diode 9
First charging diode 10
Second discharge diode 11
Third discharge diode 12
Second charging diode 13
Fourth discharge diode 14
Frequency converter control unit 15
Bus flat wave capacitor 16
First DC bus 17
Second DC bus 18
Zero line 19
Detailed Description
The technical solution, constructional features, achieved objects and effects of the embodiments of the present application will be described in detail below with reference to fig. 1 in the embodiments of the present application.
It should be noted that, the drawings are in very simplified form and all use non-precise proportions, which are only used for the purpose of conveniently and clearly assisting in describing the embodiments of the present application, and are not intended to limit the implementation conditions of the present application, so that the present application has no technical significance, and any modification of structure, change of proportion or adjustment of size, without affecting the efficacy and achievement of the present application, should still fall within the scope covered by the technical content disclosed by the present application.
It is noted that in the present application, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
As shown in fig. 1, the application provides a frequency converter anti-phase-failure power supply, which comprises a first direct current bus 17, a second direct current bus 18, a zero line 19, a first three-phase rectifier bridge 3, a second three-phase rectifier bridge 4, a frequency converter control part 15, a first flat wave part and a second flat wave part. The first dc bus 17 and the second dc bus 18 are used for transmitting dc current, the first dc bus 17 and the second dc bus 18 are respectively connected to the first three-phase rectifier bridge 3 and the second three-phase rectifier bridge 4, and the inverter control unit 15 is connected between the first dc bus 17 and the second dc bus 18. The input end of the inverter control part 15 is connected to the first dc bus 17 and the second dc bus 18, respectively, and the output end of the inverter control part 15 is used for connecting an external load. The direct current in the first direct current bus 17 and the second direct current bus 18 comes from the rectification of the three-phase alternating current input from the outside by the first three-phase rectifier bridge 3 and the second three-phase rectifier bridge 4. The input end of the first three-phase rectifier bridge 3 is connected to an external three-phase power input end, the output end of the first three-phase rectifier bridge 3 is connected to the frequency converter control part 15 through a first direct current bus 17 and a second direct current bus 18 respectively, and the first three-phase rectifier bridge 3 is used for converting three-phase alternating current input from the external into direct current and outputting the direct current to the frequency converter control part 15 through the first direct current bus 17 and the second direct current bus 18. The second three-phase rectifier bridge 4 has the same function as the first three-phase rectifier bridge 3, and is also used for converting three-phase alternating current input from the outside into direct current and outputting the direct current to the frequency converter control part 15. The method comprises the following steps: the input end of the second three-phase rectifier bridge 4 is connected to an external three-phase power input end, the output end of the second three-phase rectifier bridge 4 is connected to the frequency converter control part 15 through a first direct current bus 17 and a second direct current bus 18 respectively, and the second three-phase rectifier bridge 4 is used for converting three-phase alternating current input from the external into direct current and outputting the direct current to the frequency converter control part 15 through the first direct current bus 17 and the second direct current bus 18. In order to avoid current fluctuation on the first direct current bus 17 and the second direct current bus 18 caused by fluctuation of an external input power supply, the first three-phase rectifier bridge 3 and the second three-phase rectifier bridge 4 are respectively connected with different external three-phase power supplies, when one phase of the external three-phase power supplies connected with the first three-phase rectifier bridge 3 or the second three-phase rectifier bridge 4 fails to cause fluctuation, the other rectifier bridge can still keep normal operation, plays a role in preventing phase failure, namely, as long as two groups of three-phase power supplies are not lost when the two groups of three-phase power supplies are identical, the operation of the frequency converter anti-phase failure power supply cannot be influenced.
The first flat wave part and the second flat wave part are connected in series and then are connected between the first direct current bus 17 and the second direct current bus 18, and a zero line 19 is led out from the connection part between the first flat wave part and the second flat wave part. The first flat wave part comprises a first flat wave capacitor 5, a first charging diode 10 and a second flat wave capacitor 6 which are sequentially connected; the anode of the first charging diode 10 is connected to a first direct current bus 17 through a first smoothing capacitor 5, and the cathode of the first charging diode 10 is connected to a zero line 19 through a second smoothing capacitor 6; further, a first discharge diode 9 is further arranged between the cathode of the first charge diode 10 and the first direct current bus 17, and the cathode of the first discharge diode 9 is connected to the first direct current bus 17; still further, a second discharge diode 11 is provided between the positive electrode of the first charge diode 10 and the zero line 19, and the positive electrode of the second discharge diode 11 is connected to the zero line 19.
The second flat wave part comprises a third flat wave capacitor 7, a second charging diode 13 and a fourth flat wave capacitor 8 which are sequentially connected; the positive electrode of the second charging diode 13 is connected to a zero line 19 through a third smoothing capacitor 7, and the negative electrode of the second charging diode 13 is connected to a second direct current bus 18 through a fourth smoothing capacitor 8; further, a third discharge diode 12 is further arranged between the cathode of the second charge diode 13 and the zero line 19, and the cathode of the third discharge diode 12 is connected to the zero line 19; still further, a fourth discharge diode 14 is further disposed between the second charge diode 13 and the second dc bus 18, and the anode of the fourth discharge diode 14 is connected to the second dc bus 18.
A bus smoothing capacitor 16 is connected in series between the first dc bus 17 and the second dc bus 18, and the bus smoothing capacitor 16 is connected in parallel with the inverter control unit 15. The bus smoothing capacitor 16 is used to reduce voltage fluctuations input to both ends of the inverter control unit 15.
In this embodiment, a phase line reactor 2 is connected in series at each of the connection points of the first three-phase rectifier bridge 3 and the external three-phase power input terminal, and a phase line reactor 2 is connected in series at each of the connection points of the second three-phase rectifier bridge 4 and the external three-phase power input terminal. The phase line reactor 2 can suppress the network side harmonics of the incoming power supply. Meanwhile, a neutral reactor 1 is connected in series to the neutral line 19.
In the present embodiment, the capacitance values of the first smoothing capacitor 5, the second smoothing capacitor 6, the third smoothing capacitor 7, and the fourth smoothing capacitor 8 are the same. The capacitors with the same capacitance value are placed at different positions to serve as the first flat wave capacitor 5, the second flat wave capacitor 6, the third flat wave capacitor 7 and the fourth flat wave capacitor 8, so that the current on different lines of the circuit caused by different capacitance values can be avoided, and the current carrying capacity of the circuit is improved. And the capacitors with the same capacitance are adopted, so that capacitors which need to be distinguished when the frequency converter is installed to prevent the phase-failure power supply are avoided, and the installation difficulty is reduced.
Meanwhile, the first charging diode 10 and the second charging diode 13 are identical in specification. And the first discharge diode 9, the second discharge diode 11, the third discharge diode 12, and the fourth discharge diode 14 are diodes of the same specification.
The frequency converter phase-failure prevention power supply has the advantages that any three phases of two groups of alternating current power supplies can be completely and normally operated, and only one phase is completely operated with low power. The alternating current input side has different output or restarting protection action due to alternating current voltage fluctuation, so that the important production machinery is greatly influenced, and the low-voltage ride through equipment based on the energy storage battery is high in cost. The frequency converter phase-failure prevention power supply is supplied with power by adopting the common input of the two groups of alternating current power supplies and closing a loop at the direct current side of the rectifier bridge, so that even if any group of alternating current power supplies have phase failure, the voltages on the first direct current bus 17 and the second direct current bus 18 are not influenced as long as the other group of alternating current power supplies with the same phase work normally, and the phase-failure prevention effect is achieved. That is, as long as the two sets of power supplies are not lost when they are identical, the operation of the inverter control unit 15 and the external load is not affected. In addition, because of the unidirectional conductive isolation effect of the first three-phase rectifier bridge 3 and the second three-phase rectifier bridge 4, the problem of non-synchronous loop closing of the two groups of alternating current power supplies does not occur, and phase failure prevention is well realized. When only one phase of one of the two groups of power supplies is intact under adverse conditions, the frequency converter anti-phase-failure power supply provided by the application utilizes zero phase and the first flat wave part and the second flat wave part to form two groups of series charging and parallel discharging circuits, can play a role in half-wave voltage doubling rectification, and can still maintain the voltage of the first direct current bus 17 and the second direct current bus 18 to be more than 400V, so that the frequency converter control part and external load of 600V on the rated first direct current bus 17 and the second direct current bus 18 can be maintained to operate under low power without power failure, and a better phase failure prevention effect is achieved.
In addition, the anti-phase-failure power supply of the frequency converter has the advantage of being convenient to install on the existing line, only the rectifying part of the alternating current input side of the existing frequency converter is needed to be changed, the core part of the frequency converter is not needed to be changed, and the first direct current bus 17 and the second direct current bus 18 of the alternating current input side with the frequency converter control part 15 can be directly installed, so that the installation is convenient.
While the present application has been described in detail through the foregoing description of the preferred embodiment, it should be understood that the foregoing description is not to be considered as limiting the application. Many modifications and substitutions of the present application will become apparent to those of ordinary skill in the art upon reading the foregoing. Accordingly, the scope of the application should be limited only by the attached claims.
Claims (8)
1. The utility model provides a phase-failure prevention power of converter, its characterized in that, the phase-failure prevention power of converter includes:
the system comprises a first direct current bus, a second direct current bus and a zero line;
the input end of the first three-phase rectifier bridge is connected with an external three-phase input end, and the output end of the first three-phase rectifier bridge is respectively connected with the first direct current bus and the second direct current bus;
the input end of the second three-phase rectifier bridge is connected with an external three-phase input end, the first three-phase rectifier bridge and the second three-phase rectifier bridge are connected with different external three-phase input ends, and the output end of the second three-phase rectifier bridge is respectively connected with the first direct current bus and the second direct current bus;
the input end of the frequency converter control part is respectively connected with the first direct current bus and the second direct current bus, and the output end of the frequency converter control part is used for being connected with an external load;
the first flat wave part comprises a first flat wave capacitor, a first charging diode and a second flat wave capacitor which are sequentially connected, wherein the positive electrode and the negative electrode of the first charging diode are respectively connected with the first direct current bus and the zero line, a first discharging diode is arranged between the negative electrode of the first charging diode and the first direct current bus, the negative electrode of the first discharging diode is connected with the first direct current bus, a second discharging diode is arranged between the positive electrode of the first charging diode and the zero line, and the positive electrode of the second discharging diode is connected with the zero line;
the second flat wave part is arranged between the second direct current bus and the zero line, the second flat wave part comprises a third flat wave capacitor, a second charging diode and a fourth flat wave capacitor which are sequentially connected, the anode and the cathode of the second charging diode are respectively connected with the zero line and the second direct current bus, a third discharging diode is further arranged between the cathode of the second charging diode and the zero line, the cathode of the third discharging diode is connected with the zero line, a fourth discharging diode is further arranged between the second charging diode and the zero line, and the anode of the fourth discharging diode is connected with the second direct current bus.
2. The inverter anti-phase loss power supply according to claim 1, wherein a bus smoothing capacitor is connected in series between the first dc bus and the second dc bus, and the bus smoothing capacitor is connected in parallel with the inverter control section.
3. A converter anti-phase loss power supply according to claim 1, wherein a phase line reactor is connected in series at each connection of said first three-phase rectifier bridge and said external three-phase input.
4. A converter anti-phase loss power supply according to claim 1, wherein a phase line reactor is connected in series at each connection of said second three-phase rectifier bridge and said external three-phase input terminal.
5. A converter anti-phase-failure power supply according to claim 1, wherein a zero-line reactor is connected in series with the zero line.
6. The converter anti-phase-loss power supply according to claim 1, wherein the first smoothing capacitor, the second smoothing capacitor, the third smoothing capacitor, and the fourth smoothing capacitor have the same capacitance value.
7. The inverter anti-phase-failure power supply of claim 1, wherein the first charging diode and the second charging diode are the same diode.
8. The inverter anti-phase-failure power supply of claim 1, wherein the first discharge diode, the second discharge diode, the third discharge diode, and the fourth discharge diode are the same diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311009208.5A CN117039801A (en) | 2023-08-11 | 2023-08-11 | Phase-failure prevention power supply of frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311009208.5A CN117039801A (en) | 2023-08-11 | 2023-08-11 | Phase-failure prevention power supply of frequency converter |
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| Publication Number | Publication Date |
|---|---|
| CN117039801A true CN117039801A (en) | 2023-11-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311009208.5A Pending CN117039801A (en) | 2023-08-11 | 2023-08-11 | Phase-failure prevention power supply of frequency converter |
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| Country | Link |
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| CN (1) | CN117039801A (en) |
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2023
- 2023-08-11 CN CN202311009208.5A patent/CN117039801A/en active Pending
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