CN201435681Y - Switch-switching type high-voltage inverter having unit redundancy - Google Patents
Switch-switching type high-voltage inverter having unit redundancy Download PDFInfo
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- CN201435681Y CN201435681Y CN2009201077842U CN200920107784U CN201435681Y CN 201435681 Y CN201435681 Y CN 201435681Y CN 2009201077842 U CN2009201077842 U CN 2009201077842U CN 200920107784 U CN200920107784 U CN 200920107784U CN 201435681 Y CN201435681 Y CN 201435681Y
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Abstract
The utility model provides a switch-switching type high-voltage inverter having unit redundancy, which is characterized in that the high-voltage inverter comprises a transformer with multiple secondary line windings, 3m+1 power units and two switch groups; the 3m+1 power units include a standby power unit, 3m power units are equally divided into three groups, and each group respectively comprisesm power units connected in series to from a phase line of the inverter; an output terminal of the standby power unit is connected with the second phase line; the first and the third phase lines are respectively connected with the first and the second switch groups, and selectively communicated with a first contact or a second contact of the standby power unit under the control of the two switch groups; and the first, the second and the third phase lines do not form a three-phase output terminal of the inverter with one terminal connected with the standby power unit or the switch groups. The high-voltage inverter only requires 3m+1 power units to realize N+1 unit redundancy function, and saves two power units compared with the prior art requiring 3m+3 power units, thereby reducing the realization cost.
Description
Technical field
The utility model relates to a kind of high voltage converter, particularly a kind ofly can guarantee to hinder for some reason at any one power cell and under the bypass situation out of service, still has the rated voltage fan-out capability, promptly has the high voltage converter of " N+1 unit redundancy " function.Belong to electric and electronic technical field.
Background technology
Development along with power electronic technology, frequency converter is as the product of Development of Power Electronic Technology, every field in national economy is widely used as industries such as metallurgy, petrochemical industry, running water, electric power, and bringing into play more and more important effect, particularly, the application of high-voltage high-power frequency transformator is day by day extensive.And (claim power model by power cell, as shown in Figure 2) high-voltage high-power frequency transformator (as shown in Figure 1) that constitutes of series connection is as the frequency converter that is fit to China's actual conditions, excellent performance, is subjected to numerous frequency converter production firm, scientific research institutions, engineers and technicians, user's favor.
This high voltage converter structure is open in Chinese invention patent ZL97100477.3.This high voltage converter has a rectifier transformer in grid side, and this rectifier transformer has a plurality of secondary windings, and in order to suppress the harmonic wave to electrical network, these secondary windings usually adopt tortuous winding, reach the effect of phase shift, powers to the power cell of each series connection respectively.Each power cell be 3 mutually the input, single-phase output the voltage-source type frequency converter.
On circuit theory, this rectifier transformer has played the effect of isolating, and each power cell is isolated at input side each other, and like this, because the inverter bridge of power cell is connected mutually at outlet side, the whole current potential (electromotive force) of power cell will improve step by step.
In each power cell, be provided with bypass circuit, can need to set up low resistance current path between 2 contacts when out of service at power cell at its outlet side, make that this power cell is out of service after, the complete machine endure.The outlet side of power cell does not have bypass mechanism, can realize unit bypass by this power cell output zero vector of control.So-called " zero vector " is meant that power cell by controlling the state of its inner electronic power switch, makes between two output and exports no-voltage, is the Low ESR short-circuit condition.
Hinder for some reason and bypass when out of service as power cell, the voltage fan-out capability of frequency converter must decrease, and can't export its rated output voltage, will inevitably influence the normal operation of load.Therefore, take place, be necessary high voltage converter is carried out the fault redundance design for fear of the situation of this normal operation because of the load of indivedual power cell fault effects.Thisly hinder for some reason and under the bypass situation out of service, the redundancy structure that still has the rated voltage fan-out capability is called N+1 unit redundancy structure at any one power cell in order to ensure high voltage converter.
At present, for realizing that the common way of above-mentioned N+1 unit redundancy function is to increase one-level totally three power cells on the basis of existing frequency converter.Promptly be total to 3m power cell and be increased to m+1 level 3m+3 power cell altogether, three groups of secondary windings of the corresponding increase of rectifier transformer by original m level.Though this way can realize N+1 unit redundancy function, needing increases by three power cells and three groups of secondary windings, and as seen the cost of its required increase is also higher.
The utility model promptly is at being to realize the too high problem of the N+1 required cost of unit redundancy function in the prior art, and the N+1 unit redundancy structure in the high voltage converter has been carried out structural design, achieves cost and reduces.
The utility model content
It is to realize the too high problem of the N+1 required cost of unit redundancy function that utility model purpose of the present utility model is to solve in the prior art, and a kind of high voltage converter with N+1 unit redundancy structure of realizing that cost is more cheap is provided.
Utility model purpose of the present utility model is achieved by following technical proposals:
Switch change-over unit redundancy high-voltage frequency converter is characterized in that: be made of many secondary winding transformer, a 3m+1 power cell and two switches set; Include a standby power units in the described 3m+1 power cell; Remaining 3m power cell is divided into three groups, and every group of phase line that is made of frequency converter respectively m power unit cascade is respectively first, second, third phase line; Described two switches set are respectively first switches set and second switch group;
Described power cell is the frequency converter of a three-phase input, single-phase output; The input of each power cell links to each other with a secondary winding in described many secondary winding transformer respectively; The output of described power cell is respectively positive pole and negative pole;
An output of described standby power units links to each other with second phase line; The end that this standby power units links to each other with second phase line is first contact, and an end that links to each other with second phase line is not second contact; Two outputs of described standby power units all link to each other with described first, second switches set; Described first, third phase line links to each other with described first, second switches set respectively, and selects to be connected with first contact or second contact of described standby power units under the control of these two switches set; The end that described first, second, third phase line does not link to each other with standby power units or switches set constitutes the three-phase output end of frequency converter.
Be under the normal operating condition at this high voltage converter, described standby power units is in bypass condition or output zero vector, perhaps described two switches set with first, the end that is attached thereto of third phase line is connected with first contact of standby power units simultaneously.
Described first, second switches set is made up of two diverter switches respectively; Two diverter switch one ends of described first switches set link to each other with an end of described first phase line, and the other end links to each other with second contact with first contact of described standby power units respectively; Two diverter switch one ends of described second switch group link to each other with an end of described third phase line, and the other end links to each other with second contact with first contact of described standby power units respectively.
Described two switches set are respectively a single-pole double-throw switch (SPDT); The moving contact of the single-pole double-throw switch (SPDT) of described first switches set links to each other with an end of described first phase line, and two fixed contacts link to each other with second contact with first contact of described standby power units respectively; The moving contact of the single-pole double-throw switch (SPDT) of described second switch group links to each other with an end of described third phase line, and two fixed contacts link to each other with second contact with first contact of described standby power units respectively.
Described many secondary winding transformer is the transformer group that the single many secondary winding transformer or the transformer of a plurality of former limits serial or parallel connection constitute.
Described switches set is mechanical switch or power electronic device.
The beneficial effects of the utility model are: this high voltage converter only needs 3m+1 power cell to realize N+1 unit redundancy function, need 3m+3 power cell to save two power cells and two groups of transformer secondary windings compared to existing technology, reduced the realization cost.Simultaneously, this this standby power units is in bypass condition when the frequency converter operate as normal can not devote oneself to work, and only just puts into operation having when breaking down in the operate power unit, has therefore reduced system loss, has improved system effectiveness.
Description of drawings
Fig. 1 is the structural representation of existing high voltage converter;
Fig. 2 is an exemplary power cellular construction schematic diagram;
Fig. 3 is the structural representation of switch change-over unit redundancy high-voltage frequency converter;
Fig. 4 is the first example structure schematic diagram of switch change-over unit redundancy high-voltage frequency converter;
Fig. 5 is the second example structure schematic diagram of switch change-over unit redundancy high-voltage frequency converter.
Embodiment
Below in conjunction with drawings and Examples the utility model is described further.
As previously mentioned, the structure of existing high voltage converter is made of many secondary winding transformer and three power unit cascade groups usually as shown in Figure 1.Wherein, each power cell be 3 mutually the input, single-phase output the voltage-source type frequency converter.The input of each power cell links to each other with a secondary winding in described many secondary winding transformer respectively.Power cell in same series connection group is connected mutually, to improve output voltage.Three power unit cascade groups then constitute the three-phase output end of this high voltage converter jointly, are connected to load.Because three series connection groups are respectively as a phase line of high voltage converter three-phase output end.Therefore in order to reach three-phase output balance, the way of realization of simplifying most of this high voltage converter is exactly that the number of three series connection groups power cell of being connected equates.Be to include 3m power cell in the high voltage converter, be in series with m power cell in each phase line respectively, wherein m is a positive integer.This structure also is the typical structure of existing high voltage converter.
Utility model purpose of the present utility model promptly is to increase redundancy structure on above-mentioned high voltage converter basis of simplifying most, makes it when can realizing N+1 unit redundancy function, reduces again as far as possible and realizes cost.Therefore, here designed redundancy structure should be emergent power unit in arbitrary phase line is hindered for some reason and during bypass situation out of service, can be according to this fault phase line of control compensation, make triple line can revert to impartial quantity in the operate power unit or equivalence for impartial quantity in the operate power unit.
The utility model promptly is based on this design philosophy and designs this redundancy structure.Fig. 3 is the designed high voltage converter structural representation of the utility model.As shown in Figure 3, the output of high voltage converter constitutes (m is a positive integer) and two switches set KG1, KG2 formations by 3m+1 power cell.Wherein, include a standby power units in 3m+1 the power cell, remaining 3m power cell is divided into three groups, and every group of phase line that is made of frequency converter respectively m power unit cascade is respectively first, second, third phase line.
Fig. 2 is the exemplary block diagram of power cell.As shown in Figure 2, each power cell is the voltage-source type frequency converter of a three-phase input, single-phase output.Its input links to each other with a secondary winding in described many secondary winding transformer respectively.The output of each power cell has two contacts, respectively forward output and negative sense output.Be without loss of generality, in Fig. 2, use the forward output and the negative sense output of U, V mark power cell respectively.Being provided with bypass mechanism at the power cell output can need when out of service at this power cell, sets up low resistance current path between two contact U of its output and V, and it is out of service that this power cell is bypassed.The outlet side of power cell does not have bypass mechanism, realizes unit bypass by controlling this power cell output zero vector.Therefore, " being in bypass condition " described in the utility model can be the bypass circuit conducting, also can be power cell output zero vector.
One output of described standby power units links to each other with an end of second phase line.Here the end that this standby power units is linked to each other with second phase line is defined as first contact, and an end that links to each other with second phase line is not defined as second contact.Second contact of standby power units links to each other with two switches set KG1, KG2 simultaneously.One end of described first phase line links to each other with KG1, an end of third phase line links to each other with KG2.
Under the control of the switch of switches set KG1, KG2, the end that can select first, the third phase line links to each other with switches set is connected with first contact or second contact of described standby power units.The end that described first, second, third phase line does not link to each other with standby power units or switches set KG1, KG2 constitutes the three-phase output end of frequency converter, is connected to load.
Should be pointed out that above-mentioned first, second, third phase line is the phase line of three symmetries in the high voltage converter.Here, institute's standby power units of carrying links to each other with second phase line wherein just for the ease of narrating, and in fact standby power units can be chosen one of them phase line arbitrarily and connects.Therefore, its generality is not lost in so herein statement.
When this high voltage converter was in normal operating condition, the state of described standby power units and switches set KG1, KG2 can have two kinds of selections.First kind, standby power units is in bypass condition or output zero vector, then switches set KG1 can be connected to the end that first phase line is attached thereto first contact of standby power units, or second contact or be connected to two contacts simultaneously, the end that switches set KG2 can be attached thereto the third phase line is connected to first contact of standby power units, or second contact or be connected to two contacts simultaneously.Second kind, switches set KG1, KG2 simultaneously with first, the end that is attached thereto of third phase line is connected with first contact of standby power units, then standby power units can be in and not export, exports zero vector or bypass condition; If the end that switches set KG1, KG2 control at this moment first, third phase line are attached thereto is not communicated with second contact of standby power units simultaneously, then standby power units can be in free position.
This high voltage converter is when normal operation like this, connectivity points with these two switches set is a neutral point, respectively there be m power cell putting into operation in each phase line, promptly be under the operational mode that above-mentioned high voltage converter simplifies most, therefore can satisfy the specified output needs of frequency converter.
It is otherwise noted that above-mentioned many secondary winding transformer when practical application, and should not be construed as the form that is confined to single many secondary winding transformer.It equally also can use by former limit connect mutually or parallel with one another can equivalence be that a plurality of transformers of secondary winding transformer more than are realized.Therefore, many secondary winding transformer mentioned herein, its concrete way of realization should be as the limited factor of the utility model protection range.
Fig. 4, Fig. 5 provide two kinds of concrete execution modes of described switches set KG1, KG2 respectively.
As shown in Figure 4, switches set KG1 is made up of two diverter switch K1, K4, and switches set KG2 is made up of two diverter switch K2, K3.Described diverter switch K1, K4 one end link to each other with an end of first phase line, and the other end links to each other with second contact with first contact of standby power units respectively.Described diverter switch K2, K3 one end link to each other with an end of third phase line, and the other end links to each other with second contact with first contact of standby power units respectively.
As shown in Figure 5, switches set KG1, KG2 select for use single-pole double-throw switch (SPDT) K5, a K6 to realize respectively, select to connect first contact or second contact of standby power units by the switching of single-pole double-throw switch (SPDT).
Here, described diverter switch and single-pole double-throw switch (SPDT) can be mechanical switch such as contactor, circuit breaker, perhaps be power electronic device such as controllable silicon, bidirectional triode thyristor, GTO, IGBT, IGCT, perhaps be other device, circuit or equipment of can control circuit between conducting state (low impedance state) and disjunction state (high impedance status), changing.
When above-mentioned high voltage converter shown in Figure 3 was in normal operating condition, standby power units was in bypass condition, or switches set KG1, KG2 are connected with first contact of standby power units simultaneously.Like this, when frequency converter is in normal operating condition, there be m power cell to be in running status respectively in its three phase lines, promptly moving according to aforementioned high voltage converter operational mode of simplifying most.
Hinder for some reason in the operate power unit and bypass when out of service as one, high voltage converter is checked this present position, fault power unit.Here, described first, second, third phase line is consistent with the structrual description of aforementioned high voltage converter shown in Figure 3.
If this fault power unit is in first phase line, high voltage converter control switch group KG1 is connected with second contact of standby power units, and control switch group KG2 is connected with first contact of standby power units; The output voltage of this standby power units with former should be identical by the voltage fundamental of described fault power unit output, phase place is identical or differ 180 degree.At this moment, triple line with first contact of standby power units as the neutral point between the frequency converter triple line.And standby power units is access in first phase line that breaks down, and the output of compensate for failed power cell makes triple line still can keep triple line respectively to have the mode of simplifying most of m power cell on-line operation to move, and has satisfied the specified output needs of frequency converter.
If this fault power unit is in second phase line, high voltage converter control switch group KG1 is connected with second contact of standby power units, and control switch group KG2 is connected with second contact of standby power units; The output voltage of this standby power units with former should be identical by the voltage fundamental of described fault power unit output, phase place is identical or differ 180 degree.At this moment, triple line with second contact of standby power units as the neutral point between the frequency converter triple line.And standby power units is access in second phase line that breaks down, and the output of compensate for failed power cell makes triple line still can keep triple line respectively to have the mode of simplifying most of m power cell on-line operation to move, and has satisfied the specified output needs of frequency converter.
If this fault power unit is in second phase line, high voltage converter control switch group KG1 is connected with first contact of standby power units, and control switch group KG2 is connected with second contact of standby power units; The output voltage of this standby power units with former should be identical by the voltage fundamental of described fault power unit output, phase place is identical or differ 180 degree.At this moment, triple line with first contact of standby power units as the neutral point between the frequency converter triple line.And standby power units is access in the third phase line that breaks down, and the output of compensate for failed power cell makes triple line still can keep triple line respectively to have the mode of simplifying most of m power cell on-line operation to move, and has satisfied the specified output needs of frequency converter.
As seen, the designed switch change-over unit redundancy high-voltage frequency converter of the utility model is under the control of above-mentioned redundancy control method, can satisfy at any one power cell and hinder for some reason and under the bypass situation out of service, frequency converter still has the N+1 unit redundancy function of rated voltage fan-out capability.This needs 3m+3 power cell to realize that this function saved two power cells and 2 transformer secondary windings compared to existing technology, has reduced the realization cost.Simultaneously, because the designed standby power units of the utility model can not put into operation by the switches set short circuit when the frequency converter operate as normal, only when having the operate power unit to break down, just put into operation, therefore reduced system loss, improved system effectiveness.
Claims (6)
1, switch change-over unit redundancy high-voltage frequency converter is characterized in that: be made of many secondary winding transformer, a 3m+1 power cell and two switches set; Include a standby power units in the described 3m+1 power cell; Remaining 3m power cell is divided into three groups, and every group of phase line that is made of frequency converter respectively m power unit cascade is respectively first, second, third phase line; Described two switches set are respectively first switches set and second switch group;
Described power cell is the frequency converter of a three-phase input, single-phase output; The input of each power cell links to each other with a secondary winding in described many secondary winding transformer respectively; The output of described power cell is respectively positive pole and negative pole;
An output of described standby power units links to each other with second phase line; The end that this standby power units links to each other with second phase line is first contact, and an end that links to each other with second phase line is not second contact; Two outputs of described standby power units all link to each other with described first, second switches set; Described first, third phase line links to each other with described first, second switches set respectively, and selects to be connected with first contact or second contact of described standby power units under the control of these two switches set; The end that described first, second, third phase line does not link to each other with standby power units or switches set constitutes the three-phase output end of frequency converter.
2, switch change-over unit redundancy high-voltage frequency converter as claimed in claim 1, it is characterized in that: be under the normal operating condition at this high voltage converter, described standby power units is in bypass condition or output zero vector, perhaps described two switches set with first, the end that is attached thereto of third phase line is connected with first contact of standby power units simultaneously.
3, switch change-over unit redundancy high-voltage frequency converter as claimed in claim 1 is characterized in that: described first, second switches set is made up of two diverter switches respectively; Two diverter switch one ends of described first switches set link to each other with an end of described first phase line, and the other end links to each other with second contact with first contact of described standby power units respectively; Two diverter switch one ends of described second switch group link to each other with an end of described third phase line, and the other end links to each other with second contact with first contact of described standby power units respectively.
4, switch change-over unit redundancy high-voltage frequency converter as claimed in claim 1 is characterized in that: described two switches set are respectively a single-pole double-throw switch (SPDT); The moving contact of the single-pole double-throw switch (SPDT) of described first switches set links to each other with an end of described first phase line, and two fixed contacts link to each other with second contact with first contact of described standby power units respectively; The moving contact of the single-pole double-throw switch (SPDT) of described second switch group links to each other with an end of described third phase line, and two fixed contacts link to each other with second contact with first contact of described standby power units respectively.
5, switch change-over unit redundancy high-voltage frequency converter as claimed in claim 1 is characterized in that: described many secondary winding transformer is the transformer group that the single many secondary winding transformer or the transformer of a plurality of former limits serial or parallel connection constitute.
6, as claim 1,3 or 4 described switch change-over unit redundancy high-voltage frequency converters, it is characterized in that: described switches set is mechanical switch or power electronic device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201077842U CN201435681Y (en) | 2009-04-30 | 2009-04-30 | Switch-switching type high-voltage inverter having unit redundancy |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201077842U CN201435681Y (en) | 2009-04-30 | 2009-04-30 | Switch-switching type high-voltage inverter having unit redundancy |
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| Publication Number | Publication Date |
|---|---|
| CN201435681Y true CN201435681Y (en) | 2010-03-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009201077842U Expired - Lifetime CN201435681Y (en) | 2009-04-30 | 2009-04-30 | Switch-switching type high-voltage inverter having unit redundancy |
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2009
- 2009-04-30 CN CN2009201077842U patent/CN201435681Y/en not_active Expired - Lifetime
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20100331 Effective date of abandoning: 20090430 |