CN204258614U - Voltage-source type multi-level frequency conversion device is from redundancy running topological system - Google Patents
Voltage-source type multi-level frequency conversion device is from redundancy running topological system Download PDFInfo
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- CN204258614U CN204258614U CN201420804467.7U CN201420804467U CN204258614U CN 204258614 U CN204258614 U CN 204258614U CN 201420804467 U CN201420804467 U CN 201420804467U CN 204258614 U CN204258614 U CN 204258614U
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Abstract
The utility model discloses a kind of voltage-source type multi-level frequency conversion device from redundancy running topological system, relate to voltage-source type multi-level frequency conversion device topological structure technical field.The utility model has a rectifier transformer, rectifier transformer output correspondence is connected with three pulse wave rectifier circuit, each pulse wave rectifier circuit connects by a pre-charge circuit inverter that has public direct-current voltage midpoint, three A, B, C three-phases having public direct-current voltage midpoint inverter correspondence and connect three phase alternating current motor; Each phase and a diverter switch of connecting between the inverter with public direct-current voltage midpoint of three phase alternating current motor, one of them diverter switch connects the direct voltage mid point with the inverter of public direct-current voltage midpoint; The inverter with public direct-current voltage midpoint described in three connects external control circuit.Achieve frequency converter from redundancy running, improve the coefficient of safety of frequency converter in commercial Application.
Description
Technical field
The utility model relates to voltage-source type multi-level frequency conversion device topological structure technical field, and specifically a kind of voltage-source type multi-level frequency conversion device is from redundancy running topological system.
Background technology
Very high to the security requirement of some important transmission portion in industrial production, require to realize running without interruption or only shutting down the short time, therefore, for preventing affecting production because of transmission device fault, system many employings frequency converter redundant configuration scheme.Although improve the coefficient of safety of system cloud gray model by frequency converter redundant configuration scheme, system investments is excessive, needs to add a set of frequency converter and a set of switching cabinet more.And due to the increase of number of devices, need more sufficient installing space, thus further increase civil engineering and installation cost.Therefore, how to improve frequency converter redundancy running ability according to frequency converter own structural characteristics, to ensure that drive system can not cause paralysis because of the damage of frequency converter respective switch device, become in industrial production the practical problem needing to solve, particularly fail safe and the device space are all being required in strict applied environment.
Summary of the invention
In order to solve traditional electrical potential source type multi-level frequency conversion device because of single brachium pontis fault asking of cannot normally running
Topic, the utility model provides a kind of voltage-source type multi-level frequency conversion device from redundancy running topological circuit, achieves frequency converter from redundancy running, improves the coefficient of safety of frequency converter in commercial Application.
The utility model realizes with following technical scheme: a kind of voltage-source type multi-level frequency conversion device is from redundancy running topological system, comprise rectifier transformer, rectifier transformer output correspondence is connected with three pulse wave rectifier circuit, each pulse wave rectifier circuit connects by a pre-charge circuit inverter that has public direct-current voltage midpoint, three A, B, C three-phases having public direct-current voltage midpoint inverter correspondence and connect three phase alternating current motor; It is characterized in that: each phase and a diverter switch of connecting between the inverter with public direct-current voltage midpoint of three phase alternating current motor, one of them diverter switch connects the direct voltage mid point with the inverter of public direct-current voltage midpoint; The inverter with public direct-current voltage midpoint described in three connects external control circuit.
It is further: the described inverter with public direct-current voltage midpoint adopts NPC 3H bridge cascaded inverter; Described pulse wave rectifier circuit adopts the 12 pulse wave rectifier devices be made up of two 6 Pulses Rectifiers.
Described pre-charge circuit is made up of resistance and switch in parallel.
Described diverter switch adopts single-pole double-throw switch (SPDT).
The beneficial effects of the utility model are: for the voltage-source type multi-level frequency conversion device with public direct-current voltage midpoint, after adopting this topological circuit, frequency converter three-phase voltage can not only be met and export the normal operation mode driving three phase electric machine, and can ensure that frequency converter is when only there being single-phase brachium pontis fault, by being connected mutually direct for corresponding motor with frequency converter direct voltage mid point, exporting with frequency converter two-phase drives three phase electric machine mode to realize entirely carrying Half Speed operation, improve the coefficient of safety of Variable Frequency Drives in commercial Application, stop the appearance having a strong impact on industrial production situation because of frequency converter single-phase fault.
Accompanying drawing explanation
Fig. 1 is the utility model circuit diagram,
Fig. 2 a kind of embodiment circuit diagram of the present utility model,
Fig. 3 becomes NPC 3H bridge cascade connection type five level frequency conversion by the connection circuit of its own switch device realization from redundancy running,
The utility model is applied to coal master to ventilate driving control system figure by Fig. 4.
In figure: 1, rectifier transformer, 2, pulse wave rectifier circuit, 3, pre-charge circuit, 4, there is the inverter of public direct-current voltage midpoint, 5, diverter switch, 6, three phase alternating current motor, 7, direct voltage mid point, 8, electric capacity, 9, IGBT, 10, diode, 11, Variable Frequency Drives, 12, counter-rotating axial flow fan, 13, main air duct.
Embodiment
As shown in Figure 1, a kind of voltage-source type multi-level frequency conversion device is from redundancy running topological system, comprise rectifier transformer 1, rectifier transformer 1 output correspondence is connected with three pulse wave rectifier circuit 2, each pulse wave rectifier circuit 2 connects by a pre-charge circuit 3 A, B, C three-phase that an inverter 4, three with public direct-current voltage midpoint has public direct-current voltage midpoint inverter 4 correspondence connection three phase alternating current motor; Each phase and a diverter switch 5 of connecting between the inverter with public direct-current voltage midpoint of three phase alternating current motor, one of them diverter switch 5 connects the direct voltage mid point 7 with the inverter of public direct-current voltage midpoint; The inverter with public direct-current voltage midpoint described in three connects external control circuit.
As shown in Figure 2, NPC 3H bridge cascade connection type five-level converter is example, specifically introduces the utility model.The inverter with public direct-current voltage midpoint adopts NPC 3H bridge cascaded inverter; Pulse wave rectifier circuit adopts the 12 pulse wave rectifier devices be made up of two 6 Pulses Rectifiers.Pre-charge circuit is made up of resistance and switch in parallel.Diverter switch QS1, QS2, QS3 all adopt single-pole double-throw switch (SPDT).NPC 3H bridge cascade connection type five-electrical level inverter is connected to motor by mode selector switch, and under normal complete year full speed mode of operation, diverter switch QS1, QS2, QS3 work in position I.Full Half Speed of carrying is under redundancy running pattern, during NPC 3H bridge cascade connection type five-electrical level inverter A phase brachium pontis fault, QS1 works in position II, diverter switch QS2, QS3 work in position I, can ensure three phase alternating current motor A phase and NPC 3H bridge cascade connection type five-electrical level inverter direct voltage mid point lead directly to, thus realize NPC 3H bridge cascade connection type five-electrical level inverter B, C two-phase export drive three phase alternating current motor run entirely to carry Half Speed mode.In like manner, during NPC 3H bridge cascade connection type five-electrical level inverter B phase brachium pontis fault, diverter switch QS2 works in position II, and diverter switch QS1, QS3 work in position I; During NPC 3H bridge cascade connection type five-electrical level inverter C phase brachium pontis fault, diverter switch QS3 works in position II, and diverter switch QS1, QS2 work in position I.
Fig. 3 realizes the connecting circuit of frequency converter from redundancy running by frequency converter its own switch device, only gives the connecting circuit of inversion part to motor for convenience of description herein, needs to ensure that in rectangle frame, switching device is unspoiled under which.Power supply after electric capacity 8 pairs of rectifications carries out filtering, voltage stabilizing, and two diodes 10 and four IGBT9 form diode clamp type (NPC) inverter bridge.Under normal complete year full speed mode of operation, frequency converter three-phase bridge arm switch proper device operation.Full Half Speed of carrying is under redundancy running pattern, during frequency converter A phase brachium pontis fault, in frequency converter A phase brachium pontis rectangular box, switching device works in opening state always, frequency converter B, C two-phase brachium pontis switching device normally work, can ensure that three phase alternating current motor A phase and direct voltage mid point lead directly to, thus realize frequency converter B, C two-phase exports and drives three phase alternating current motor to run entirely to carry Half Speed mode.In like manner, during frequency converter B phase brachium pontis fault, in frequency converter B phase brachium pontis rectangular box, switching device works in opening state always, and frequency converter A, C two-phase brachium pontis switching device normally work; During frequency converter C phase brachium pontis fault, in frequency converter C phase brachium pontis grey square frame, switching device works in opening state always, and frequency converter A, B two-phase brachium pontis switching device normally work.
The utility model, with additional diverter switch redundant mode and frequency converter its own switch device redundancy pattern, realizes frequency converter two-phase and exports the complete year Half Speed emergency operating demand of driving threephase load motor realization.Under frequency converter its own switch device redundancy pattern, frequency converter output voltage is motor lines voltage, only needs to ensure that frequency converter two phase voltage exports mutual deviation 60 ° of electrical degrees and motor three-phase voltage balances the normal operation that can realize motor; Export because this pattern low-converter changes two phases line voltage into by three-phase phase voltage output, make machine phase voltages amplitude reduce to original half, and output current of frequency converter ability is constant, thus can ensure that motor meets Half Speed operation in complete year.For Frequency Converter Control part, only need to ensure that the two-phase brachium pontis output voltage that frequency converter normally works becomes mutual deviation 60 ° of electrical degrees from mutual deviation 120 ° of electrical degrees under redundancy running pattern at frequency converter, can ensure that three phase electric machine normally runs entirely to carry half fast mode.
Adopt the voltage-source type multi-level frequency conversion device with public direct-current mid point from the Variable Frequency Drives of redundant topology circuit, be applied to coal master ventilate driving control system example as shown in Figure 4.Applied voltage source type multi-level frequency conversion device is from the Variable Frequency Drives 11 of redundant topology structure, and drive the counter-rotating axial flow fan 12 in Ventilator Room, gas underground coal mine being contained gas is extracted into ground through main air duct 13 and enters in air.Apply the Variable Frequency Drives of this redundant topology structure, can stop because the single-phase brachium pontis fault of frequency converter causes the appearance of blowing-out situation, effective guarantee mire ventilation safety.
Claims (4)
1. a voltage-source type multi-level frequency conversion device is from redundancy running topological system, comprise rectifier transformer, rectifier transformer output correspondence is connected with three pulse wave rectifier circuit, each pulse wave rectifier circuit connects by a pre-charge circuit inverter that has public direct-current voltage midpoint, three A, B, C three-phases having public direct-current voltage midpoint inverter correspondence and connect three phase alternating current motor; It is characterized in that: each phase and a diverter switch of connecting between the inverter with public direct-current voltage midpoint of three phase alternating current motor, one of them diverter switch connects the direct voltage mid point with the inverter of public direct-current voltage midpoint; The inverter with public direct-current voltage midpoint described in three connects external control circuit.
2. voltage-source type multi-level frequency conversion device according to claim 1 is from redundancy running topological system, it is characterized in that: the described inverter with public direct-current voltage midpoint adopts NPC 3H bridge cascaded inverter; Described pulse wave rectifier circuit adopts the 12 pulse wave rectifier devices be made up of two 6 Pulses Rectifiers.
3. voltage-source type multi-level frequency conversion device according to claim 1 and 2 is from redundancy running topological system, it is characterized in that: described pre-charge circuit is made up of resistance and switch in parallel.
4. the voltage-source type multi-level frequency conversion device according to any one of claim 1 or 2, from redundancy running topological system, is characterized in that: described diverter switch adopts single-pole double-throw switch (SPDT).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420804467.7U CN204258614U (en) | 2014-12-18 | 2014-12-18 | Voltage-source type multi-level frequency conversion device is from redundancy running topological system |
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| CN201420804467.7U CN204258614U (en) | 2014-12-18 | 2014-12-18 | Voltage-source type multi-level frequency conversion device is from redundancy running topological system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106253757A (en) * | 2016-08-24 | 2016-12-21 | 中国重型机械研究院股份公司 | Hot-rolling mill high power DC transmission and control system |
| CN107147338A (en) * | 2017-04-27 | 2017-09-08 | 东北大学 | A kind of module separate type wind power generator control system and method |
| CN108649859A (en) * | 2018-04-27 | 2018-10-12 | 上海交通大学 | Mining traction anti-explosion permanent magnet Synchromous machine drive system and its rotor position detecting method |
| CN110492819A (en) * | 2019-07-12 | 2019-11-22 | 江苏师范大学 | A kind of FCS-MPC control method of two-phase multi-electrical level inverter driving three-phase motor |
-
2014
- 2014-12-18 CN CN201420804467.7U patent/CN204258614U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106253757A (en) * | 2016-08-24 | 2016-12-21 | 中国重型机械研究院股份公司 | Hot-rolling mill high power DC transmission and control system |
| CN107147338A (en) * | 2017-04-27 | 2017-09-08 | 东北大学 | A kind of module separate type wind power generator control system and method |
| CN107147338B (en) * | 2017-04-27 | 2019-08-23 | 东北大学 | A kind of module separate type wind power generator control system and method |
| CN108649859A (en) * | 2018-04-27 | 2018-10-12 | 上海交通大学 | Mining traction anti-explosion permanent magnet Synchromous machine drive system and its rotor position detecting method |
| CN110492819A (en) * | 2019-07-12 | 2019-11-22 | 江苏师范大学 | A kind of FCS-MPC control method of two-phase multi-electrical level inverter driving three-phase motor |
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| 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: 20150408 Termination date: 20151218 |
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| EXPY | Termination of patent right or utility model |