CN101098107B - High-voltage frequency converter of power unit series - Google Patents
High-voltage frequency converter of power unit series Download PDFInfo
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- CN101098107B CN101098107B CN200610089476A CN200610089476A CN101098107B CN 101098107 B CN101098107 B CN 101098107B CN 200610089476 A CN200610089476 A CN 200610089476A CN 200610089476 A CN200610089476 A CN 200610089476A CN 101098107 B CN101098107 B CN 101098107B
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Abstract
The invention discloses a high-voltage frequency converter with serially connected power units, which is composed of a rectifying transformer at electric network, 3*N power units, and a control system. The rectifying transformer is provided with 3*N secondary windings, which each secondary winding is connected with the input of one power unit. The maximum output voltage of each power unit is V. The invention is characterized in that the secondary windings of the rectifying transformer are divided into three groups, while each group has N windings, as Wa1 to WaN, Wb1 to WbN, and Wc1 to WcN, which are arranged sequentially. The connection sequence between one group of secondary windings and the power units is reverse to the connection sequence between other two groups with the power units. The three secondary windings connected with the power units A1, B1, and C1 have two ones nearby. Two insulation voltages between two nearby secondary winding groups have one not smaller than V and onenot smaller than N*V.
Description
Technical field
The present invention relates to a kind of high voltage converter of power unit cascade, refer to a kind of high voltage converter that transformer secondary winding and power cell connected mode is carried out improved power unit cascade especially.
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 the high-voltage high-power frequency transformator (as shown in Figure 2) that is made of as shown in Figure 1 power cell 1 series connection is as the high voltage converter that is fit to China's actual conditions, excellent performance, be subjected to numerous frequency converter production firm, scientific research institutions, engineers and technicians, user's favor, shown the prospect that it is in the ascendant.This high voltage converter structure is open by Chinese patent 97100477, and it mainly is made of many secondary winding transformer 2, a plurality of power cell 1 and control system.
The design feature of this high voltage converter that is made of a plurality of power unit cascades is in grid side a rectifier transformer 2 to be arranged, this rectifier transformer has N secondary winding, each secondary winding links to each other with a power cell, powers to the power cell of each series connection respectively.In order to suppress the harmonic wave to electrical network, these secondary windings adopt tortuous winding, reach the effect of phase shift.On circuit theory, the effect of isolating has been played in the effect of this rectifier transformer, 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 of power cell will improve step by step.
With Fig. 2 is example, and with respect to mid point O, the output voltage of power cell A1, B1, C1 is not high, and the output voltage of supposing each power cell is 690V, and the output voltage of A1 is 690V so, and is also like this for B1, C1.But owing to A2, B2, C2 connect with A1, B1, C1, so, the output voltage of A1 and A2 series connection is exactly the twice of 690V, i.e. 1380V.When 5 power unit cascades, A1 is 3450V to the output voltage of A5, and same situation also can occur on to B5, C1 to C5 at B1.Three terminals of U, V, W on the Zhongdao motor, the voltage of alignment O is respectively 3450V.
As everyone knows, the load of frequency converter generally is a three phase alternating current motor, and for alternating current machine, the voltage in three phases phase place must differ 120 degree, and this can realize in the PWM of Electric Machine Control waveform.Through such processing, above-mentioned U, V, three terminals of W voltage each other are
Promptly be roughly 6KV.
In patent 97100477 and all kinds of document, and the arrangement mode of the rectifier transformer secondary winding of the above-mentioned high voltage converter of not mentioned formation, especially the arrangement mode of a plurality of windings of transformer secondary and each power cell. in general existing product, the structure of rectifier transformer is as shown in Figure 3. in order to say something, Fig. 3 is only with the form example of 5 grades of series connection. and transformer is generally conventional three-phase column-type transformer, because the secondary tapping of transformer is more, therefore generally former limit high pressure winding is placed the inboard, the secondary winding places the outside, the needed secondary winding of three-phase converter module is divided into three groups, three phase windings that 5 phase shifts are arranged in every group, as Wa1, Wa2, Wa5, Wb1, Wb2, Wb5, Wc1, Wc2, Wc5, the angle of phase shift is respectively 0, ± 12 °, ± 24 °, these 5 windings are tactic from top to bottom in the transformer outside. for technologic convenience, usually, every group of winding of transformer secondary is connected with the mode that transducer power unit is all taked to be linked in sequence, 5 unit with the A phase are example, secondary winding Wa1 meets power cell A1, Wa2 meets power cell A2 ... Wa5 meets power cell A5; Perhaps order conversely, be that Wa5 meets power cell A1, Wa4 meets power cell A2, Wa1 meets power cell A5. and also adopts in a like fashion with C power cell mutually mutually for B and be linked in sequence with the secondary winding. and on technology, the such secondary winding arrangement mode and the connected mode of secondary winding and power cell are quite neat.
For this traditional Transformer Winding arrangement mode, isolation voltage between the transformer secondary winding should so be considered: because the voltage of each power cell in mutually raises step by step, so the voltage in every group between adjacent two power cells is not high, between W1 and W2, consider that the voltage of 690V raises just passable; But,,, between Wa1 and the Wa5, then have the voltage of 3450V to raise such as the situation of 5 grades of series connection along with increasing of series connection progression; For the Wa5 and B Wb1 winding mutually of A phase, though physically adjacent, consider the insulation needs of 3450V at least.So when making transformer, will reserve enough insulation distances at least between every group, guarantee the needs of this operating voltage.This insulation distance has increased the highly unshakable in one's determination of transformer, has wasted material, and has made the characteristic variation of transformer.
Summary of the invention
In view of the foregoing, the purpose of this invention is to provide a kind of connected mode of passing through to change between transformer secondary winding and the power cell, improve transformer characteristic, reduce the high voltage converter of the power unit cascade of frequency converter cost.
For achieving the above object, the present invention by the following technical solutions: a kind of high voltage converter of power unit cascade is made of the rectifier transformer of grid side, 3 * N power cell and control system; Described rectifier transformer has 3 * N secondary winding, and each secondary winding links to each other with the input of a power cell; Described power cell is made of three-phase diode rectifier bridge, the big electric capacity and the half-bridge converter that are connected in parallel on three-phase diode rectifier bridge dc bus side, and the maximum output voltage of each power cell is V; Every N power cell is divided into one group and is followed in series to form a phase, is wye connection between 3 phases, and the stem of the three groups of N that connects successively power cells links to each other becomes neutral point, and afterbody links to each other with the three-phase alternating-current supply input of three phase electric machine respectively; It is characterized in that: the secondary winding of described rectifier transformer is divided into 3 groups, every group N; These winding sequence arrangement; The head end of two groups of secondary windings W for example wherein
B1, W
C1With tail end W for example
BN, W
CNLink to each other successively according to the order from the stem to the afterbody with two groups of power cells of connecting successively respectively; The head end of another group secondary winding is W for example
A1With tail end W for example
ANLink to each other successively according to the order from the afterbody to the stem with another group power cell of series connection successively.
3 secondary windings that link to each other with three power cells of close wye connection neutral point in the described transformer secondary winding have two to be adjacent.
Insulation voltage between 3 groups of secondary windings of described transformer two adjacent groups has one to be not less than V, and another one is not less than N * V.
Because the one group of secondary winding in 3 groups of secondary windings of rectifier transformer of the present invention and the order of connection of power cell, opposite with the order of connection of other two groups of secondary windings and power cell, so, for the insulation voltage between 3 groups of secondary windings of transformer two adjacent groups, have one to be not less than V according to operating voltage and to design, another one is not less than N * V according to operating voltage and designs and get final product.Like this, according to the scheme that the present invention proposes, transformer can reduce a part of insulation distance, because the power of high voltage converter is generally all bigger, therefore supporting transformer efficiency is also bigger, and at present, the price of silicon steel sheet and copper cash is all moved in a high position, and the market demand of high voltage converter is in continuous increase, so, because reducing of this SI semi-insulation distance can bring the decline of apparent in view transformer cost, simultaneously, also improved the characteristic of transformer.
Description of drawings
Fig. 1 is existing power cell structure schematic diagram;
Fig. 2 is the high voltage converter structural representation of existing power unit cascade;
Fig. 3 is traditional many secondary winding rectifier transformer structural representation;
Fig. 4 is transformer secondary winding of the present invention and power cell annexation schematic diagram.
Embodiment
The high voltage converter of power unit cascade disclosed by the invention mainly is made of many secondary winding transformer, 3 * N power cell and the control system of grid side, the maximum output voltage of each power cell is V, and the secondary winding of transformer connects power cell respectively; The every N of power cell series connection constitutes a phase, be that power cell A1-AN connects in proper order, power cell B1-BN connects in proper order, power cell C1-CN connects in proper order, it between the three-phase wye connection, be connected to form mid point O near three power cell A1, B1 of wye connection neutral point, the output of C1, give alternating current machine or other electric.
The difference of the present invention and existing power unit cascade high voltage converter is: the present invention improves the connected mode between transformer secondary winding and the power cell.The secondary winding of transformer is divided into 3 groups, every group N, is respectively W
A1... W
ANW
B1... W
BNW
C1... W
CNThese winding sequence arrangement, each secondary winding links to each other with the input of a power cell; The order of connection that one group of secondary winding and power cell are wherein arranged, opposite with the order of connection of other two groups of secondary windings and power cell, make 3 transformer secondary windings that link to each other with power cell A1, B1, C1, there are two to be adjacent.
Fig. 4 is specific embodiment of the invention secondary winding and power cell annexation schematic diagram.As shown in the figure, the present invention is divided into three groups of a, b, c with transformer secondary winding, and every group of N is example with N=5 among the figure, is respectively W
A1... W
A5W
B1... W
B5W
C1... W
C5A is organized W in the secondary winding
A1Link to each other W with the input of power cell A5
A2Meet power cell A4 ... W
A5Meet power cell A1; And, b is organized W in the secondary winding
B1Meet power cell B1, W
B2Meet power cell B2 ... W
B5Meet power cell B5; C is organized W in the secondary winding
C1Meet power cell C1, W
C2Meet power cell C2 ... W
C5Meet power cell C5, that is, a is organized the order of connection of secondary winding and power cell, opposite with the order of connection of other two groups of secondary windings and power cell, like this, make the transformer secondary winding W of power cell A1 and B1 correspondence
ANAnd W
B1Adjacent.
Because three groups of windings of transformer secondary are symmetrical fully, so this connected mode can be deduced is different forms.For example, b is organized the order of connection of secondary winding and power cell, opposite with the order of connection of two groups of secondary windings of other a, c and power cell, like this, make the transformer secondary winding W of power cell B1 and C1 correspondence
BNAnd W
C1Adjacent; In like manner, c can also be organized the order of connection of secondary winding and power cell, opposite with the order of connection of two groups of secondary windings of other a, b and power cell, like this, make the transformer secondary winding W of power cell C1 and A1 correspondence
CNAnd W
A1Adjacent.
The operating voltage of supposing every group of interior adjacent two windings of transformer secondary winding is V, according to all being the design that is linked in sequence between every group of secondary winding of traditional transformer and the power cell, insulation voltage between two groups of windings (being between a group secondary winding and the b group secondary winding, between b group secondary winding and the c group secondary winding) all must be not less than N * V according to operating voltage and design.And, the present invention is owing to wherein there is the order of connection of one group of secondary winding and power cell, opposite with the order of connection of other two groups of secondary windings and power cell, so, for the insulation voltage between the two adjacent groups, have one to be not less than V according to operating voltage and to design, another one is not less than N * V according to operating voltage and designs.Like this, according to the scheme that the present invention proposes, transformer can reduce a part of insulation distance, because the power of high voltage converter is generally all bigger, therefore supporting transformer efficiency is also bigger, and at present, the price of silicon steel sheet and copper cash is all moved in a high position, and the market demand of high voltage converter is in continuous increase, so, because reducing of this SI semi-insulation distance can bring the decline of apparent in view transformer cost, the characteristic of transformer also is provided simultaneously.
Owing to require mutually insulated between the transformer secondary winding, the insulation voltage between two groups of secondary windings is different again, so, can be by adopting different insulating material; Or adopt identical insulating material, the thickness difference of material; Or, satisfy different insulation needs by insulation spacing difference between the secondary winding.
Constituting rectifier transformer of the present invention can be dry-type transformer or oil-immersed type transformer; Dry-type transformer can be open type or poured with epoxy resin formula transformer.
The above is specific embodiments of the invention and the know-why used, and is any based on the equivalent transformation on the technical solution of the present invention basis, all belongs within the protection range of the present invention.
Claims (8)
1. the high voltage converter of a power unit cascade is made of rectifier transformer, 3 * N power cell and the control system of grid side; Described rectifier transformer has 3 * N secondary winding, and each secondary winding links to each other with the input of a power cell; Described power cell is made of three-phase diode rectifier bridge, the big electric capacity and the half-bridge converter that are connected in parallel on three-phase diode rectifier bridge dc bus side, and the maximum output voltage of each power cell is V; Every N power cell is divided into one group and is followed in series to form a phase, is wye connection between 3 phases, and the stem of the three groups of N that connects successively power cells links to each other becomes the neutral point of three phase mains, and afterbody links to each other with the three-phase alternating-current supply input of three phase electric machine respectively; It is characterized in that:
The secondary winding of described rectifier transformer is divided into 3 groups, every group of N (W
A1... W
ANW
B1... W
BNW
C1... W
CN), these winding sequence arrangement; Head end (the W of two groups of secondary windings wherein
B1, W
C1) and tail end (W
BN, W
CN) link to each other successively according to the order from the stem to the afterbody with two groups of power cells of connecting successively respectively; Head end (the W of another group secondary winding
A1) and tail end (W
AN) link to each other successively according to the order from the afterbody to the stem with another group power cell of series connection successively.
2. the high voltage converter of power unit cascade according to claim 1 is characterized in that: 3 secondary windings that link to each other with three power cells (A1, B1, C1) near the wye connection neutral point in the described transformer secondary winding have two to be adjacent.
3. the high voltage converter of power unit cascade according to claim 1 and 2 is characterized in that: the insulation voltage between 3 groups of secondary windings of described transformer two adjacent groups, and there is one to be not less than V, another one is not less than N * V.
4. the high voltage converter of power unit cascade according to claim 3 is characterized in that: the insulating material difference between the mutually insulated between the described transformer secondary winding, every group of secondary winding.
5. the high voltage converter of power unit cascade according to claim 3 is characterized in that: the insulating material between the mutually insulated between the described transformer secondary winding, every group of secondary winding is identical, the thickness difference of insulating material.
6. the high voltage converter of power unit cascade according to claim 3 is characterized in that: the insulation spacing difference between the mutually insulated between the described transformer secondary winding, every group of secondary winding.
7. according to the high voltage converter of claim 4 or 5 or 6 described power unit cascades, it is characterized in that: described transformer is a dry-type transformer, and this dry-type transformer is open type or poured with epoxy resin formula.
8. according to the high voltage converter of claim 4 or 5 or 6 described power unit cascades, it is characterized in that: described transformer is an oil-immersed type transformer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200610089476A CN101098107B (en) | 2006-06-28 | 2006-06-28 | High-voltage frequency converter of power unit series |
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|---|---|---|---|
| CN200610089476A CN101098107B (en) | 2006-06-28 | 2006-06-28 | High-voltage frequency converter of power unit series |
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| CN101098107B true CN101098107B (en) | 2010-05-12 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101699732B (en) * | 2009-10-30 | 2012-08-22 | 艾默生网络能源有限公司 | Fault control method of converter |
| CN101882779A (en) * | 2010-07-21 | 2010-11-10 | 深圳市库马克新技术股份有限公司 | High voltage converter with differential protection |
| JP6119458B2 (en) * | 2013-06-25 | 2017-04-26 | 富士電機株式会社 | Power converter |
| CN105788830A (en) * | 2016-05-19 | 2016-07-20 | 东莞市光华实业有限公司 | 200kVA36 pulse phase-shifting transformer |
| CN109617422B (en) * | 2019-01-18 | 2020-06-23 | 北京荣信慧科科技有限公司 | Four-stage series 20 MW-level 10KV high-voltage high-power frequency converter and method |
| CN112803805A (en) * | 2021-03-15 | 2021-05-14 | 机械工业第九设计研究院有限公司 | Multi-port direct-current power supply and combined control method |
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|---|---|---|---|---|
| US5969966A (en) * | 1995-09-08 | 1999-10-19 | Kabushiki Kaisha Yaskawa Denki | Power converting apparatus and method using a multiple three-phase PWM cycloconverter system |
| CN1060599C (en) * | 1997-02-03 | 2001-01-10 | 北京凯奇新技术开发总公司 | High-voltage large-power frequency convertor without power network pollution |
| CN2701167Y (en) * | 2004-05-09 | 2005-05-18 | 鞍山荣信电力电子股份有限公司 | A middle-voltage variable-frequency control arrangement for implementing four-quadrant running |
| CN2914483Y (en) * | 2006-06-28 | 2007-06-20 | 北京利德华福电气技术有限公司 | Improved high voltage transducer |
-
2006
- 2006-06-28 CN CN200610089476A patent/CN101098107B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5969966A (en) * | 1995-09-08 | 1999-10-19 | Kabushiki Kaisha Yaskawa Denki | Power converting apparatus and method using a multiple three-phase PWM cycloconverter system |
| CN1060599C (en) * | 1997-02-03 | 2001-01-10 | 北京凯奇新技术开发总公司 | High-voltage large-power frequency convertor without power network pollution |
| CN2701167Y (en) * | 2004-05-09 | 2005-05-18 | 鞍山荣信电力电子股份有限公司 | A middle-voltage variable-frequency control arrangement for implementing four-quadrant running |
| CN2914483Y (en) * | 2006-06-28 | 2007-06-20 | 北京利德华福电气技术有限公司 | Improved high voltage transducer |
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