CN205178889U - Public dc bus system of two converters after optimization - Google Patents
Public dc bus system of two converters after optimization Download PDFInfo
- Publication number
- CN205178889U CN205178889U CN201520881167.3U CN201520881167U CN205178889U CN 205178889 U CN205178889 U CN 205178889U CN 201520881167 U CN201520881167 U CN 201520881167U CN 205178889 U CN205178889 U CN 205178889U
- Authority
- CN
- China
- Prior art keywords
- frequency converter
- bus wire
- public
- contactor
- public direct
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000005457 optimization Methods 0.000 title claims abstract description 9
- 230000009977 dual effect Effects 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims 3
- 101000576569 Halobacterium salinarum (strain ATCC 700922 / JCM 11081 / NRC-1) 50S ribosomal protein L18 Proteins 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 102100032244 Dynein axonemal heavy chain 1 Human genes 0.000 description 3
- 102100021735 Galectin-2 Human genes 0.000 description 3
- 101001016198 Homo sapiens Dynein axonemal heavy chain 1 Proteins 0.000 description 3
- 101001042446 Homo sapiens Galectin-2 Proteins 0.000 description 3
- 230000007257 malfunction Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000003032 molecular docking Methods 0.000 description 1
Landscapes
- Power Conversion In General (AREA)
Abstract
Public dc bus system of two converters after optimization is the public dc bus speed control system of novel pair of converter. This system inserts inlet wire reactor and the problem of air switch in order to solve electric wire netting harmonic interference at the converter power end. Insert fast acting fuse, contactor contact switch between converter direct current link and public dc bus, through the external control unit detect converter operating condition of design, the break -make of control converter direct current link and public dc bus, trouble converter problem can not in time be broken off by the solution system.
Description
Technical field
The utility model relates to a kind of frequency converter timing system, especially public direct-flow bus wire frequency converter field.
Background technology
At present, dual frequency converter public direct-flow bus wire system is directly parallel on public brake unit the DC bus link of two universal frequency converters.The mains input side of two frequency converters accesses same electrical network, and inversion outlet side connects respective motor respectively, and the capacitance cathode mutual connection negative pole mutual connection of two frequency converter intermediate DC link, is parallel to same brake unit or energy feedback unit simultaneously.But DC bus directly connection can cause frequency converter rectifier bridge load uneven, mains by harmonics impact is large, and system easily breaks down, and DC bus can not cut off in time and causes fault coverage to expand, damages frequency converter.
Summary of the invention
Directly connecting mains by harmonics interference that DC bus produces and can not the problem of open failure frequency converter in time for solving, the utility model proposes a kind of frequency converter public direct-flow bus wire system.
The utility model solves the technical scheme that its technical problem adopts: the rectification side of two universal frequency converters accesses same stable electrical network respectively by reactor and the air switch of band auxiliary contact, two universal frequency converter inversion outlet sides connect two motors respectively, the DC link of two universal frequency converters is taken up in order of priority by fast acting fuse and contacts of contactor docking, wherein positive pole connects positive pole, negative pole connects negative pole, and brake unit or energy feedback unit are parallel to public direct-flow bus wire two ends.Design the control unit as Fig. 4, ensure to only have two frequency converters all to meet normal access electrical network and the situation of failure-free operation, the contacts of contactor on DC bus just can be connected.If certain converter power supply side air switch is closed or certain frequency converter is in malfunction, so control unit automatic disconnection can not access power supply or is in the contacts of contactor of DC bus link of malfunction frequency converter, isolation does not start or fault frequency converter, reaches the target reducing fault effects.
The beneficial effects of the utility model are: reactor effectively can reduce the interference of mains by harmonics to frequency converter, increase source impedance simultaneously and absorb the due to voltage spikes of frequency converter input power.Can guarantee that respective DC link is parallel to public direct-flow bus wire or is breaking at the fault frequency converter of public direct-flow bus wire state operation in time by each frequency converter under normal operating conditions by control unit to the control of contactor, improve system reliability.Control circuit structure is simply easy to realize.
Accompanying drawing explanation
Fig. 1 is universal frequency converter structure principle chart.
Fig. 2 is conventional dual-conversion device public direct-flow bus wire structure chart.
Fig. 3 is the two universal frequency converter public direct-flow bus wire main circuit diagram of the utility model.
Fig. 4 is the utility model public direct-flow bus wire system control unit circuit diagram.
Embodiment
Dual frequency converter public direct-flow bus wire system after optimization, as shown in Figure 3, three-phase alternating-current supply is through air switch QF and reactor (1) access converter power supply input, and reactor is selected with frequency converter Same Efficieney for main circuit.Frequency converter DC output end is successively by fast acting fuse (2), contacts of contactor (3) access public direct-flow bus wire, and wherein positive pole connects positive pole, and negative pole connects negative pole.125% of fast acting fuse rated current selectable load rated current.Contactless contactor is used for frequency converter break-make public direct-flow bus wire.
As shown in Figure 4, by connecting the air switch QF of control unit, control unit connects indicator light HL3 to the utility model public direct-flow bus wire system control unit circuit diagram, First Frequency Converter Control link (1), second Frequency Converter Control link (2) form.SB1, SB2 in controlling unit (1) are respectively public Bus cutting, push button, and whether the DC link that contactor coil KM11 controls First frequency converter accesses public direct-flow bus wire, and HL11 is its status indicator lamp.1C, 1A, 1B in controlling unit are First frequency converter failure alarm terminals, and during normal operation, 1C, 1A connect 1C, 1B disconnection, and during fault, 1C, 1B connection 1C, 1A disconnect.According to the running status of First frequency converter, coil KM12, KM13 can judge whether frequency converter can access public direct-flow bus wire, HL12, HL13 are coil state indicator light.1E, 1F of controlling unit are the power supply signal terminal of frequency converter, and frequency converter access power supply 1E, 1F then connect, otherwise disconnect.Whether coil KM14 can be energized according to First frequency converter judges that can frequency converter access public direct-flow bus wire.Controlling unit (2) is identical with the structure of controlling unit (1).
In the First Frequency Converter Control link (1) of Fig. 4, if First frequency converter switch on power after failure-free operation, then 1C, 1A connect, coil KM12 is energized, and the normally opened contact KM12 of controlling unit (1) closes, and HL12 lamp is bright, 1C, 1B disconnect, coil KM13 power-off, the normally-closed contact KM13 hold mode of controlling unit (1), HL13 lamp goes out, 1E, 1F connect, coil KM14 is energized, and the normally opened contact KM14 of controlling unit (1) closes, and HL14 etc. are bright.SB2 is pressed the button according to the state of indicator light (the bright HL13 of HL12 go out HL14 bright), coil KM11 is energized, and the normally opened contact KM11 of controlling unit closes self-locking, and HL11 lamp is bright, normally opened contact KM11(3 in main circuit diagram 3) closed, First frequency converter DC link access public direct-flow bus wire; If First frequency converter failure, then in Fig. 4, in controlling unit (1), 1C, 1A disconnect, and 1C, 1B connect, coil KM13 is energized, and the normally-closed contact KM13 of controlling unit (1) disconnects, and HL13 is bright, coil KM11 power-off, HL11 lamp goes out, and in Fig. 3 main circuit, contact KM11 disconnects; If First frequency converter three phase mains access failure or disconnection, then 1E, 1F disconnect, coil KM14 power-off, HL14 lamp goes out, and Fig. 4 controlling unit (1) contact KM14 disconnects, coil KM11 power-off, in Fig. 3 main circuit, contact KM11 disconnects, the connection of excision frequency converter and public direct-flow bus wire.In Fig. 4, controlling unit (2) is identical with controlling unit (1) principle.
Claims (6)
1. the dual frequency converter public direct-flow bus wire system after optimizing, it is characterized in that: between two frequency converter rectification side and electrical network, access air switch and reactor, fast acting fuse and contactless contactor is accessed, the independent incoming transport power supply of control unit between two frequency converter DC link and public direct-flow bus wire.
2. the dual frequency converter public direct-flow bus wire system after optimization according to claim 1, is characterized in that: described air switch is near grid side.
3. the dual frequency converter public direct-flow bus wire system after optimization according to claim 1, is characterized in that: described reactor is near frequency converter rectification side.
4. the dual frequency converter public direct-flow bus wire system after optimization according to claim 1, is characterized in that: described fast acting fuse is near frequency converter DC link outlet side.
5. the dual frequency converter public direct-flow bus wire system after optimization according to claim 1, is characterized in that: described contactless contactor is near public direct-flow bus wire side.
6. the dual frequency converter public direct-flow bus wire system after optimization according to claim 1, it is characterized in that: described control unit is by an air switch, First Frequency Converter Control link (1), second Frequency Converter Control link (2) and control unit connect indicator light composition, described First Frequency Converter Control link is by 2 buttons, 4 contactor coils, 4 contacts of contactor switches and 4 contactor working station indicator compositions, second described Frequency Converter Control link is by 2 buttons, 4 contactor coils, 4 contacts of contactor switches and 4 contactor working station indicator compositions, described control unit is connected indicator light and is connected on both ends of power after air switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520881167.3U CN205178889U (en) | 2015-11-09 | 2015-11-09 | Public dc bus system of two converters after optimization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520881167.3U CN205178889U (en) | 2015-11-09 | 2015-11-09 | Public dc bus system of two converters after optimization |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205178889U true CN205178889U (en) | 2016-04-20 |
Family
ID=55742819
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520881167.3U Expired - Fee Related CN205178889U (en) | 2015-11-09 | 2015-11-09 | Public dc bus system of two converters after optimization |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205178889U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108448909A (en) * | 2018-03-30 | 2018-08-24 | 北京天诚同创电气有限公司 | Modularized current transformer and its control method, wind power generating set |
| CN109792216A (en) * | 2016-11-17 | 2019-05-21 | 东芝三菱电机产业***株式会社 | Power inverter |
-
2015
- 2015-11-09 CN CN201520881167.3U patent/CN205178889U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109792216A (en) * | 2016-11-17 | 2019-05-21 | 东芝三菱电机产业***株式会社 | Power inverter |
| CN109792216B (en) * | 2016-11-17 | 2021-01-15 | 东芝三菱电机产业***株式会社 | Power conversion device |
| CN108448909A (en) * | 2018-03-30 | 2018-08-24 | 北京天诚同创电气有限公司 | Modularized current transformer and its control method, wind power generating set |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104158282A (en) | Dual-circuit switching control power circuit and high-voltage inverter | |
| CN101299572A (en) | Pass-by apparatus for high voltage frequency transformer | |
| CN109698615B (en) | Double-flow independent shaft control traction converter | |
| CN203660492U (en) | Microcomputer comprehensive protection device having active/passive automatic switching function | |
| CN211089218U (en) | High-capacity high-reliability rapid power supply switching device | |
| CN201733267U (en) | Power reset self-starting device for asynchronous motor | |
| CN205178889U (en) | Public dc bus system of two converters after optimization | |
| CN106130046B (en) | A kind of AC three-phase load automatic-balancing system | |
| CN203929925U (en) | A kind of protective relaying device divide-shut brake return circuit testing device | |
| CN102684158A (en) | Overheat delay protection device for motor | |
| CN203151410U (en) | Automatic switching controller for realizing mutual spare of two electric motors | |
| CN203871919U (en) | Fast switching system of power sources | |
| CN203671834U (en) | Soft start charging circuit | |
| CN102779612A (en) | Pre-magnetizing device for main power supply transformer of electric power circuit | |
| CN105207343A (en) | Control circuit for conversion of two power sources | |
| CN204103785U (en) | Silicon rectifier draw-gear | |
| CN204706521U (en) | A kind of breaker operator circuit | |
| CN109921325B (en) | Switch cabinet closing locking loop | |
| CN202586284U (en) | Motor overheating delay protection device | |
| CN203774865U (en) | A dual power switching circuit for fan power supply and a high-voltage inverter | |
| CN203838310U (en) | Electric isolation knife switch secondary circuit testing device | |
| CN208835827U (en) | A kind of energy-storage battery based on thermal power plant's AGC frequency modulation makees the spare system of station service | |
| CN103426682A (en) | Relay with safety device and relay safety device | |
| CN110931311A (en) | VSP5 switch electric control circuit | |
| CN207053400U (en) | Switch power supply equipment and system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160420 Termination date: 20161109 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |