CN203027114U - Cascading middle-voltage frequency inverter - Google Patents
Cascading middle-voltage frequency inverter Download PDFInfo
- Publication number
- CN203027114U CN203027114U CN 201220677027 CN201220677027U CN203027114U CN 203027114 U CN203027114 U CN 203027114U CN 201220677027 CN201220677027 CN 201220677027 CN 201220677027 U CN201220677027 U CN 201220677027U CN 203027114 U CN203027114 U CN 203027114U
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- frequency converter
- voltage frequency
- power cell
- medium voltage
- tandem type
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Abstract
The utility model discloses a cascading middle-voltage frequency inverter. The frequency inverter comprises a shell, a pluggable power unit which is arranged in the shell and provided with a built-in bypass circuit, an operation mechanism which is used for changing the power unit on line and an external bypass device, wherein the operation mechanism comprises a propelling device used for pushing and pulling the power unit and a guide rail pulley device arranged along the pushing-pulling direction.
Description
Technical field
The utility model belongs to the electric automatization equipment technical field, relates to a kind of medium voltage frequency converter, particularly a kind of high reliability tandem type medium voltage frequency converter.
Background technology
Fast development along with modern power electronics technology and microelectric technique, middle pressure high-power frequency conversion speed regulating device are constantly grown up, particularly in the situation that the reliability that high tension apparatus is used is not also that Tai Gao and price are high, people use the medium voltage frequency converters of tandem type circuit topological structure as shown in Figure 1 more in recent years.
Fig. 2 is for consisting of the power cell structure schematic diagram of tandem type medium voltage frequency converter.Along with the raising of medium voltage frequency converter output voltage, the part category that consists of whole medium voltage frequency converter is also more, and especially more crucial power cell reaches up to a hundred.
When the tandem type medium voltage frequency converter is worked; occasional occurs some or certain several device failure and power cell is broken down; this is in some extremely important occasions, and the occasion that for example requires frequency converter not shut down for a long time or simply can not shut down exactly under the nuclear power operating mode is breakneck! In order to satisfy these extremely important operating modes, usually adopt at present two kinds of bypass technology schemes commonly used:
1, adopt as shown in Figure 3 inner controllable silicon bypass design, namely at the output U of each power cell with V is other that a controllable silicon bypass circuit is set, in case when the device fault in power cell causes power cell to work, immediately the controllable silicon bypass circuit is accessed.The advantage of this bypass design: reaction speed is fast, but device is vulnerable to disturb.
2, as shown in Figure 4, at each power cell side design one internal mechanical bypass structure.In case the power cell fault can't work, change power cell by this internal mechanical bypass structure.The characteristics of this bypass design are: reliable operation, but the reaction time is long.
But, no matter adopt which kind of bypass design, all there are following two shortcomings:
1, certain power cell is in bypass condition, and frequency converter must derate move, and the bypass number is more, and the derate degree is higher;
2, power cell is in bypass condition for a long time; mean that frequency converter is in operation in spite of illness; the fault point enlarges possibly during this time; want to fix a breakdown; must be with equipment downtime; then change power cell, often this process need of changing power cell is more than 2 hours, and this is unallowed when some operating modes are on-the-spot.
The utility model content
In order to solve problems of the prior art, the purpose of this utility model is to provide a kind of tandem type medium voltage frequency converter of high reliability.When each power cell that consists of medium voltage frequency converter breaks down, can be bypassed, can in non-stop-machine situation, power cell in spite of illness be changed online again simultaneously, guarantee that frequency converter returns to non-derate running status.
For achieving the above object, the utility model is taked following technical scheme: a kind of high reliability tandem type medium voltage frequency converter, it is characterized in that: it comprises housing, is arranged on interior the plugged power cell that possesses the built in bypass circuit of housing, is used for online operating mechanism and the external bypass device of changing this power cell;
Described operating mechanism comprises for the propulsion plant of the described power cell of push-and-pull and the Guide rollers device that arranges along the push-and-pull direction.
Described propulsion plant comprises draw back plate, handle, locking bar and is used for the framework of placing described power cell, this draw back plate is connected by connecting rod with this handle, this draw back plate two ends respectively each with plate is hinged always, the two ends of this straight plate are hinged with this framework and this locking bar respectively, this framework is provided with lock tube, and this locking bar vertically is located in this lock tube and can be slided up and down; This Guide rollers device comprises the pulley of being located at these both sides, framework below and is located at described shell and the guide rail corresponding with this pulley.
The narrow shape in wide two ends in the middle of described draw back plate is.
Described connecting rod one end and described draw back plate are affixed, and the other end and described handle are hinged.
Described straight plate is provided with baffle plate, and described framework is provided with the limiting plate corresponding with this baffle plate.
Described power cell comprises pre-charging device, hands over orthogonal inverter circuit, described built in bypass circuit, plug-in and pull-off device.
Described built in bypass circuit sealing is in can.
Described built in bypass circuit is the controllable silicon bypass circuit.
Described external bypass device comprises Bypass Control plate, bypass contactor.
Described bypass contactor is for being connected in parallel.
The beneficial effects of the utility model are: the utility model high reliability tandem type medium voltage frequency converter can be changed when the power cell fault online, because frequency converter is in the high voltage running status, the online replacing can ensure personal safety by spacer assembly, when changing power cell simultaneously, the new power cell of the installing impact process that do not power on, power cell is not subjected to surge, and frequency converter can automatically terminate bypass condition.
Description of drawings
Fig. 1 is medium voltage frequency converter theory diagram of the prior art.
Fig. 2 is medium voltage frequency converter power cell of the prior art.
Fig. 3 is the power cell that possesses inner controllable silicon bypass functionality of the prior art.
Fig. 4 is the power cell that possesses the internal mechanical bypass functionality of the prior art.
Fig. 5 is the structural representation of power cell of the present utility model and operating mechanism.
Fig. 6 is power cell of the present utility model and peripheral circuit schematic diagram.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in further detail.
As Fig. 5, shown in Figure 6, the high reliability tandem type frequency converter that the utility model provides comprises: housing is arranged on interior the plugged power cell that possesses the built in bypass circuit 1 of housing, is used for online operating mechanism and the external bypass device (not shown) of changing this power cell.
Described operating mechanism comprises for the propulsion plant 2 of this power cell 1 of push-and-pull and the Guide rollers device that arranges along the push-and-pull direction.
Propulsion plant 2 comprises draw back plate 3, handle 4, locking bar 5 and the framework 6 that is used for placing this power cell, and draw back plate 3 is connected by connecting rod 7 with handle 4, the narrow shape in wide two ends in the middle of being.These connecting rod 7 one ends and this draw back plate 3 are affixed, and the other end is hinged with handle 4 and can separate with this handle.These draw back plate 3 two ends difference are respectively with plate 8 is hinged always, the two ends of this straight plate 8 are hinged with this framework 6 and this locking bar 5 respectively, and preferred, this straight plate 8 is provided with baffle plate 9, this framework 6 is provided with the limiting plate corresponding with this baffle plate 10, makes like this and can not damage this straight plate when this operating mechanism of push-and-pull.This framework 6 is provided with lock tube 11, and this locking bar 5 vertically is located in this lock tube 11 and can be slided up and down, and in the time of in the lockhole on sliding into shell, namely locks the position of power unit.
This Guide rollers device is existing Guide rollers, comprise the pulley 12 of being located at this framework 6 both sides, below and be located at this shell and the guide rail 13 corresponding with this pulley, certainly, also can guide rail be set both sides below this framework, the pulley corresponding with this guide rail is set on shell.
This power cell comprises pre-charging device, hands over orthogonal inverter circuit, built in bypass circuit, plug-in and pull-off device.This built in bypass circuit sealing can not damage because of the impact of other device in can.This built in bypass circuit is preferably the controllable silicon bypass circuit.
This external bypass device comprises Bypass Control plate, bypass contactor.This bypass contactor is size of current as required, can be connected in parallel.
Please consult Fig. 6, each power cell consists of by pre-charge circuit, friendship orthogonal inverter circuit, inner controllable silicon bypass circuit, external bypass circuit again.When inner certain device failure of power cell, the inside controllable silicon bypass circuit of power cell first puts into operation, and in 15 milliseconds, within the so short time, power cell is bypassed process does not almost have disturbance to load to this process duration again; Then power cell is reported fault to master control, and this power cell fault is learnt in master control this moment, sends instruction to the Bypass Control plate immediately, and the external bypass device that this power cell is corresponding puts into operation; After the external bypass device put into operation, inner controllable silicon bypass circuit namely can be out of service so; Namely this power cell possesses online replacing condition.
When the utility model high reliability tandem type frequency converter is changed power cell at needs, can open power cabinet door, with the handle propulsive mechanism of packing into, then outwards move handle, the pulley of power cell bottom outwards slides along guide rail, by the time slide into certain position, can pull handle continue to be pulled outwardly this moment, until can power cell be taken out of with external auxiliary device such as lift truck.The propulsive mechanism here is key mechanism, and it can guarantee that the charged position of strict and power cell isolates personnel in when operation in design.
After trouble unit is removed from frequency converter, the frequency converter of namely new power cell can being packed into this moment.Detailed process is, first power cell is sent into guide rail, then to the inner propeller power of power cabinet unit, then the propulsive mechanism of handle being packed into, the propelling of section inwards along with power cell, the plug-in and pull-off device of power cell pre-charging device contacts with two-phase in the power cell three phase supply at first, thereby two-phase electricity wherein charges to power cell DC support electric capacity by current-limiting resistance; Because the existence of pre-charge resistance, rush of current is seldom arranged in guaranteed output unit progradation; Along with power cell continues to advance, the three-phase plug-in and pull-off device of power cell all is connected with power supply, and this moment, resistance was by short circuit.After by propulsive mechanism, power cell being entered the position, re-use locking bar power cell is spacing, the guaranteed output unit because the external force reason slide.Above Description of content the process changed of whole power cell.
The above is only instantiation of the present utility model, does not limit protection range of the present utility model with this. any equivalent transformation that those skilled in the art are done based on technical solutions of the utility model, and within all belonging to protection range of the present utility model.
Claims (10)
1. high reliability tandem type medium voltage frequency converter, it is characterized in that: it comprises housing, is arranged on the plugged power cell that possesses the built in bypass circuit in housing, is used for online operating mechanism and the external bypass device of changing this power cell;
Described operating mechanism comprises for the propulsion plant of the described power cell of push-and-pull and the Guide rollers device that arranges along the push-and-pull direction.
2. high reliability tandem type medium voltage frequency converter as claimed in claim 1, it is characterized in that: described propulsion plant comprises draw back plate, handle, locking bar and is used for the framework of placing described power cell, this draw back plate is connected by connecting rod with this handle, this draw back plate two ends respectively each with plate is hinged always, the two ends of this straight plate are hinged with this framework and this locking bar respectively, this framework is provided with lock tube, and this locking bar vertically is located in this lock tube and can be slided up and down; This Guide rollers device comprises the pulley of being located at these both sides, framework below and is located at described shell and the guide rail corresponding with this pulley.
3. high reliability tandem type medium voltage frequency converter as claimed in claim 2, is characterized in that: the narrow shape in wide two ends in the middle of described draw back plate is.
4. high reliability tandem type medium voltage frequency converter as claimed in claim 2, it is characterized in that: described connecting rod one end and described draw back plate are affixed, and the other end and described handle are hinged.
5. high reliability tandem type medium voltage frequency converter as claimed in claim 2, it is characterized in that: described straight plate is provided with baffle plate, and described framework is provided with the limiting plate corresponding with this baffle plate.
6. high reliability tandem type medium voltage frequency converter as claimed in claim 1 is characterized in that: described power cell comprises pre-charging device, hands over orthogonal inverter circuit, described built in bypass circuit, plug-in and pull-off device.
7. high reliability tandem type medium voltage frequency converter as described in claim 1 or 6, it is characterized in that: described built in bypass circuit sealing is in can.
8. high reliability tandem type medium voltage frequency converter as claimed in claim 1, it is characterized in that: described built in bypass circuit is the controllable silicon bypass circuit.
9. high reliability tandem type medium voltage frequency converter as claimed in claim 1, it is characterized in that: described external bypass device comprises Bypass Control plate, bypass contactor.
10. high reliability tandem type medium voltage frequency converter as claimed in claim 9, it is characterized in that: described bypass contactor is for being connected in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220677027 CN203027114U (en) | 2012-12-10 | 2012-12-10 | Cascading middle-voltage frequency inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220677027 CN203027114U (en) | 2012-12-10 | 2012-12-10 | Cascading middle-voltage frequency inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203027114U true CN203027114U (en) | 2013-06-26 |
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ID=48651059
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220677027 Expired - Lifetime CN203027114U (en) | 2012-12-10 | 2012-12-10 | Cascading middle-voltage frequency inverter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203027114U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104426403A (en) * | 2013-09-09 | 2015-03-18 | 南京南瑞继保电气有限公司 | Module unit suitable for high-capacity modularized multi-level voltage source converter |
| CN106712648A (en) * | 2017-03-08 | 2017-05-24 | 南通大学 | Online fault rapid detection and bypass protecting method for high-voltage variable-frequency speed control system |
-
2012
- 2012-12-10 CN CN 201220677027 patent/CN203027114U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104426403A (en) * | 2013-09-09 | 2015-03-18 | 南京南瑞继保电气有限公司 | Module unit suitable for high-capacity modularized multi-level voltage source converter |
| CN106712648A (en) * | 2017-03-08 | 2017-05-24 | 南通大学 | Online fault rapid detection and bypass protecting method for high-voltage variable-frequency speed control system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130626 |
|
| CX01 | Expiry of patent term |