CN201774457U - Precharging circuit of thyristor voltage-regulating type high-voltage frequency converter - Google Patents
Precharging circuit of thyristor voltage-regulating type high-voltage frequency converter Download PDFInfo
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- CN201774457U CN201774457U CN2010201464513U CN201020146451U CN201774457U CN 201774457 U CN201774457 U CN 201774457U CN 2010201464513 U CN2010201464513 U CN 2010201464513U CN 201020146451 U CN201020146451 U CN 201020146451U CN 201774457 U CN201774457 U CN 201774457U
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Abstract
The utility model provides a precharging circuit of a thyristor voltage-regulating type high-voltage frequency converter, which is characterized by comprising an auxiliary winding, a thyristor voltage regulator and a three-phase alternating-current low-voltage power supply; the auxiliary winding is arranged on the auxiliary side of a rectifier transformer and corresponds to a primary side winding; the thyristor voltage regulator is connected in series between the auxiliary winding and the three-phase alternating-current low-voltage power supply; the input end of the thyristor voltage regulator is connected with the three-phase alternating-current low-voltage power supply, and the output end of the thyristor voltage regulator is connected with the auxiliary winding. A thyristor voltage-regulation group is used for replacing a current current-limiting resistor to generate excitation current so as to excite the transformer, thus avoiding the influence of the excitation current of the transformer on the precharging, reducing the circuit loss to the maximum extent, improving the system efficiency, lowering the system cost, and reducing the impact of the electrification process on the power grid and the power unit.
Description
Technical field
The utility model relates to a kind of pre-charge circuit that is used for high voltage converter, particularly a kind ofly produce exciting curent by thyristor transformer is carried out excitation, thereby avoided exciting curent on current-limiting resistance, to consume more powerful pre-charge circuit, belonged to the high voltage converter 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.
In high voltage converter, (claim power model, current transforming unit again 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.
High-voltage high-power frequency transformator has various topological structures, and length is limit, and this specification is only narrated at many level of the units in series type high voltage converter that is most widely used on market.When the described technology of this patent was applied to the high voltage converter of other topological structures, the narration of its operation principle, topological structure, control method and this specification was identical.
This high voltage converter structure is open in Chinese utility model 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.
Usually, this rectifier transformer has an auxiliary winding, is the cooling blower power supply of frequency converter.
At present, when high voltage converter powers at high pressure, adopt the method for directly impacting usually, promptly directly closure is the primary cut-out of its power supply.When high pressure powers on, can produce 7 to 10 times to the impulse current of rated current in this way, influence safety, the stable operation of electrical network high-voltage fence.Simultaneously, can produce very big impulse current, influence its useful life dc capacitor in the power cell and rectifying device.
A kind of solution is at the high pressure input side of frequency converter exiting pour current to be installed to suppress circuit.This circuit is made up of current-limiting resistance and high-voltage switch gear (high-pressure vacuum breaker or high-pressure vacuum contactor) in parallel with it.This circuit is connected between the input of high voltage source and high voltage converter.Before high pressure powered on, high-voltage switch gear was in off-state, by current-limiting resistance high voltage converter was charged, after charging is finished, and the closed high switch, charging process finishes.Because this circuit belongs to high-tension circuit, used device is a high tension apparatus, thus cost far above the described circuit of this patent, volume is also much larger than the described circuit of this patent.
Another kind of solution be by low-tension supply and current-limiting resistance to the auxiliary winding power supply of rectifier transformer, on the secondary winding, produce induced voltage by transformer, the dc capacitor of power cell is charged.Along with the carrying out of charging process, bypass the part current-limiting resistance with A.C. contactor gradually, after charging is finished, disconnect charging circuit, the closed high circuit breaker.Though this method can realize with the charging of low-tension supply to frequency converter, but exist some problems: first, because the rated capacity of rectifier transformer complete machine is much larger than the rated capacity of its auxiliary winding, when therefore passing through to assist winding excitatory, the stable state exciting curent is very big, excessive exciting curent can produce excessive voltage drop on current-limiting resistance, if select less A.C. contactor, the resistance of each bypass is bigger, the voltage of then each bypass impact on auxiliary winding is higher, thereby can produce very big impulse current to low-tension supply during at every turn with the A.C. contactor bypass resistance, simultaneously also the direct current in the power cell is had certain impact, if select more A.C. contactor, then cost is higher; The second, if in order to save cost, save the afterbody A.C. contactor, all current-limiting resistances of bypass not before disconnecting charging circuit are then considered ohmically voltage drop, and precharge is inadequate, still has impulse current when high pressure powers on; The 3rd, because excessive exciting curent seriously generates heat resistance, thereby this circuit need adopt high-power resistance, and volume is big, the cost height, and efficient is low.
The utility model content
Main purpose of the present utility model is to solve problems of the prior art, provide a kind of and produce exciting curent carries out excitation to transformer pre-charge circuit and control method thereof by thyristor, avoided the transformer excitation electric current to precharge influence, reduced circuit loss to greatest extent, improved system effectiveness, reduced system cost, reduced the impact of power up electrical network and power cell.
Utility model purpose of the present utility model is achieved by following technical proposals:
A kind of thyristor voltage regulation type high voltage converter pre-charge circuit is characterized in that, comprising: auxiliary winding, thyristor voltage regulator and three-phase alternating current low-tension supply;
Described auxiliary winding is arranged on the secondary side of rectifier transformer, and is corresponding with this former limit winding; Described thyristor voltage regulator is connected between auxiliary winding and the three-phase alternating current low-tension supply; The input of this thyristor voltage regulator links to each other with the three-phase alternating current low-tension supply, and its output links to each other with auxiliary winding.
Between the output of described thyristor voltage regulator and auxiliary winding, can also be provided with filter.
Described filter is LC filter or RC filter.
Input side and/or outlet side at described thyristor voltage regulator can be equipped with A.C. contactor.
Described three-phase alternating current low-tension supply generally adopts the user scene for the 380V control power supply that high voltage converter provides, and under the situation of conditions permit, selects the identical low-tension supply of high voltage source phase place that inserts with high voltage converter as far as possible.
The beneficial effects of the utility model are: this charging circuit carries out excitation by substitute existing current-limiting resistance generation exciting curent with the thyristor voltage regulation group to transformer, avoided the transformer excitation electric current to precharge influence, reduced circuit loss to greatest extent, improved system effectiveness, reduced system cost, reduced the impact of power up electrical network and power cell.
Description of drawings
Fig. 1 is the structure of cell series multi-level converter;
Fig. 2 is typical power cell structure;
Fig. 3 is the circuit diagram of thyristor voltage regulation type high voltage converter pre-charge circuit.
Embodiment
Below in conjunction with drawings and Examples the utility model is further described.
Fig. 3 is the circuit diagram of thyristor voltage regulation type high voltage converter pre-charge circuit.As shown in the figure, the rectifier transformer 1 of high voltage converter includes former limit winding 2 and secondary winding 3.The described resonant type pre-charging circuit that is used for high voltage converter is arranged on the secondary side of rectifier transformer 1, comprising: auxiliary winding 4, thyristor voltage regulator 6 and three-phase alternating current low-tension supply 8.
Described auxiliary winding 4 is arranged on the secondary side of rectifier transformer, and is corresponding with this former limit winding 2.Described thyristor voltage regulator 6 is connected between auxiliary winding 4 and the three-phase alternating current low-tension supply 8.The input of this thyristor voltage regulator 6 links to each other with three-phase alternating current low-tension supply 8, and its output links to each other with auxiliary winding 4.
Thyristor voltage regulation type pre-charging circuit as above-mentioned structure is the effect that substitutes the current-limiting resistance in the pre existing charging circuit by thyristor voltage regulator compared to its main feature of pre-charge circuit that has high voltage converter now, makes the three-phase alternating current low-tension supply carry out Regulation Control to the charging process of high voltage converter by thyristor voltage regulator.So-called thyristor is a kind of power electronic device of can the control circuit conducting or ending, and after it receives trigger impulse, makes circuit turn-on, allow to flow through forward current, forward current returns to cut-off state after being reduced to zero, until start pulse signal arrival next time.In the AC applications field,, constitute bidirectional thyristor generally with two thyristor reverse parallel connections.The equipment that comprises a bidirectional thyristor and control circuit thereof is single-phase thyristor voltage regulator, and comprising three bidirectional thyristors being distributed in three-phase and the equipment of control circuit thereof is the three-phase thyristor voltage regulator.Thyristor exchanges voltage regulator can realize progressive, the stepless adjusting of its output voltage effective value by changing the angle (being called trigger angle) of the corresponding line voltage of trigger impulse.Trigger angle is 180 when spending, and after the thyristor conducting, because the voltage at its two ends becomes negative value immediately, therefore end immediately, thereby output voltage is 0; After reducing trigger angle gradually, being conducting to the time that ends from thyristor will increase gradually, be passed to the time that the voltage of its outlet side keeps by thyristor and also just increase gradually, thereby the effective value of its output voltage will increase gradually; Trigger angle was reduced to 0 o'clock, will trigger reverse thyristor immediately after the forward thyristor ends, so the output voltage of thyristor voltage regulator was identical with supply voltage.For high voltage converter, by adopting thyristor voltage regulator, can start from scratch the voltage that promotes the auxiliary winding of transformer gradually, and then can realize to the excitatory of the flexibility of transformer with to the slow charging of dc capacitor in the power cell.In this course, the time of its charging and speed are controlled fully, therefore compare the prior art that adopts current-limiting resistance, and the charging process controllability is stronger, softer.Because the interior resistance of thyristor is far smaller than the current-limiting resistance that prior art adopts, so the charging process power consumption is littler with heating, and efficient is higher.
The described three-phase alternating current low-tension supply 8 general 380V control power supplys that adopt the user scene to provide for high voltage converter.This three-phase alternating current low-tension supply 8 promptly can be selected the identical low-tension supply of high voltage source phase place that inserts with high voltage converter for use, also can select the different low-tension supply of high voltage source phase place that inserts with high voltage converter for use.But, when this three-phase alternating current low-tension supply 8 is selected the different low-tension supply of the high voltage source phase place that inserts with high voltage converter for use,, when high pressure powers on, still may produce impulse current under this situation to high-voltage fence because there is exiting pour current in transformer.Therefore, in order to reduce the shock effect of impulse current as far as possible, under situation with good conditionsi, should select for use the low-tension supply identical as the three-phase alternating current low-tension supply with the high voltage source phase place of high voltage converter access to high-voltage fence as far as possible.
In addition, as required, between the output of described thyristor voltage regulator 6 and auxiliary winding 4, also can be provided with filter 5, in order to the harmonic wave that reduces thyristor voltage regulator 6 output voltages and compensate the required reactive power of certain charging.This filter 5 can adopt LC filter or RC filter.
In addition, sometimes charged for a long time for fear of the back thyristor voltage regulator that powers at high pressure, perhaps avoid the place coupling beyond main transformer of high voltage source and three-phase alternating current low-tension supply, can A.C. contactor be installed at the input side and/or the outlet side of thyristor voltage regulator, make thyristor voltage regulator under non-pre-charge state, carry out electrical isolation with three-phase alternating current low-tension supply/rectifier transformer.
These thyristor voltage regulator 6 capacity select for use principle to rely on auxiliary winding 4 and carry out exciting curent when excitatory for its output-current rating is not less than rectifier transformer, 2 to 3 times of generally electing this value as, and thyristor voltage regulator 6 transships when avoiding charging.
In sum, thyristor voltage regulation type high voltage converter pre-charge circuit that the utility model is designed and control method thereof are by substitute existing current-limiting resistance generation exciting curent with thyristor voltage regulator transformer to be carried out excitation, avoided the transformer excitation electric current to precharge influence, reduced circuit loss to greatest extent, improved system effectiveness, reduced system cost, reduced the impact of power up electrical network and power cell.Any not creative transformation that persons skilled in the art are done based on above-mentioned design philosophy all should be considered as within protection range of the present utility model.
Claims (5)
1. a thyristor voltage regulation type high voltage converter pre-charge circuit is characterized in that, comprising: auxiliary winding, thyristor voltage regulator and three-phase alternating current low-tension supply;
Described auxiliary winding is arranged on the secondary side of rectifier transformer, and is corresponding with the former limit winding of rectifier transformer; Described thyristor voltage regulator is connected between auxiliary winding and the three-phase alternating current low-tension supply; The input of this thyristor voltage regulator links to each other with the three-phase alternating current low-tension supply, and its output links to each other with auxiliary winding.
2. thyristor voltage regulation type pre-charging circuit as claimed in claim 1 is characterized in that: also be provided with filter between the output of described thyristor voltage regulator and auxiliary winding.
3. thyristor voltage regulation type pre-charging circuit as claimed in claim 2 is characterized in that: described filter is LC filter or RC filter.
4. as claim 1 or 2 or 3 described thyristor voltage regulation type pre-charging circuits, it is characterized in that: input side and/or outlet side at described thyristor voltage regulator are equipped with A.C. contactor.
5. as claim 1 or 2 or 3 described thyristor voltage regulation type pre-charging circuits, it is characterized in that: described three-phase alternating current low-tension supply is the identical low-tension supply of high voltage source phase place that inserts with high voltage converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201464513U CN201774457U (en) | 2010-03-29 | 2010-03-29 | Precharging circuit of thyristor voltage-regulating type high-voltage frequency converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201464513U CN201774457U (en) | 2010-03-29 | 2010-03-29 | Precharging circuit of thyristor voltage-regulating type high-voltage frequency converter |
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| CN201774457U true CN201774457U (en) | 2011-03-23 |
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| CN2010201464513U Expired - Lifetime CN201774457U (en) | 2010-03-29 | 2010-03-29 | Precharging circuit of thyristor voltage-regulating type high-voltage frequency converter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109617208A (en) * | 2018-12-26 | 2019-04-12 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七二研究所） | A kind of medium-high voltage frequency converter DC capacitor pre-charging device |
-
2010
- 2010-03-29 CN CN2010201464513U patent/CN201774457U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109617208A (en) * | 2018-12-26 | 2019-04-12 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七二研究所） | A kind of medium-high voltage frequency converter DC capacitor pre-charging device |
| CN109617208B (en) * | 2018-12-26 | 2022-01-28 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | DC capacitor pre-charging device of medium-high voltage frequency converter |
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| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
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Granted publication date: 20110323 |