CN202978804U - Self-shunt-excited excitation system based on modular multilevel converter - Google Patents
Self-shunt-excited excitation system based on modular multilevel converter Download PDFInfo
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- CN202978804U CN202978804U CN 201220696244 CN201220696244U CN202978804U CN 202978804 U CN202978804 U CN 202978804U CN 201220696244 CN201220696244 CN 201220696244 CN 201220696244 U CN201220696244 U CN 201220696244U CN 202978804 U CN202978804 U CN 202978804U
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- 230000005284 excitation Effects 0.000 title claims abstract description 30
- 238000002955 isolation Methods 0.000 claims abstract description 25
- 230000001360 synchronised effect Effects 0.000 claims abstract description 7
- 238000006243 chemical reaction Methods 0.000 claims description 44
- 238000004804 winding Methods 0.000 claims description 37
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 230000010355 oscillation Effects 0.000 abstract description 8
- 238000013016 damping Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000001629 suppression Effects 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
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Abstract
The utility model provides a self-shunt-excited excitation system based on a modular multilevel converter. The system comprises the modular multilevel converter, an isolation level and an excitation coil, an alternating-current port of the modular multilevel converter is directly connected with a generator terminal of a synchronous generator, a direct-current port of the modular multilevel converter is connected with a high-voltage side port of the isolation level, and a low-voltage side port of the isolation level is connected with a port of the excitation coil. The system has excellent expandability, can be conveniently expanded to high voltage class and power level, is suitable for high-voltage and high-power applications, and can provide positive damping for a power system by means of direct-current excitation and controlling alternating-current side reactive power, so that low-frequency/ultralow-frequency oscillation of the power system is suppressed effectively, and stability of the power system is improved.
Description
Technical field
The utility model belongs to the generator excitation technical field, is specifically related to a kind of self-shunt excitation system based on modular multi-level converter.
Background technology
Along with the development of net capacity and scale, reliability and dynamic property requirement that electric power system controls excitation are more and more higher, and the synchronous generator self-shunt excitation system becomes with its unique advantage the major way that domestic and international excitation is controlled.Modern power systems requires synchronous generator excited system can suppress 0.1Hz～3Hz low frequency/ultra-low frequency oscillation, yet the excitation system of conventional silicon controlled rectifier has been difficult to reach the purpose of the wide region low-frequency oscillation that suppresses 0.1Hz～3Hz.When electrical network generation low frequency/ultra-low frequency oscillation, the synchronous generator set end voltage also will be thereupon low frequency/ultra-low frequency oscillation significantly, set end voltage might continue at reduced levels the long period.In the duration of oscillation, fault maybe needs to augment idle if system is short-circuited, and requires the self-shunt excitation system forced exciting, in case the excitation scarce capacity occurs, will cause the systematic failures extension.
The utility model content
The purpose of this utility model is to provide self-shunt excitation system based on modular multi-level converter in purpose, be with good expansibility, can expand to easily very high electric pressure and power level, realize higher level number, reduce the alternating current-direct current harmonic component.
A kind of self-shunt excitation system based on modular multi-level converter comprises modular multi-level converter, isolation level and magnet exciting coil; The interchange port of modular multi-level converter directly is connected with synchronous generator machine end, and the DC port of modular multi-level converter is connected with the high pressure square end mouth of isolation level, and the low pressure square end mouth of isolation level connects the port of magnet exciting coil.
Further, described modular multi-level converter comprises three-phase three bridge arm circuit, every phase bridge arm circuit includes upper and lower two brachium pontis, on each, brachium pontis and lower brachium pontis include a plurality of half-bridge submodules and a current limiting reactor, a plurality of half-bridge submodules are connected successively, after an end after series connection is connected with current limiting reactor, as exchanging port, the other end is as DC port.
Further, described half-bridge submodule is comprised of a half-bridge circuit and Capacitance parallel connection.
Further, described isolation level comprises high frequency modulated part, intermediate frequency transformer and high frequency reduction part, the input of high frequency modulated part is high pressure square end mouth, the output of high frequency modulated part connects high pressure side's winding of intermediate frequency transformer, low pressure side's winding of intermediate frequency transformer connects the input of high frequency reduction part, and the output of high frequency reduction part is low pressure square end mouth.
Further, described intermediate frequency transformer is comprised of high pressure side's winding and a plurality of low pressure sides winding; Described high frequency modulated part is comprised of a plurality of H bridge power conversion modules, be connected with high pressure side's winding of intermediate frequency transformer after the output of each H bridge power conversion module is connected successively, each H bridge power conversion module input is followed in series to form high pressure square end mouth; Described high frequency reduction part is comprised of a plurality of the 2nd H bridge power conversion modules, the input of each the 2nd H bridge power conversion module is connected one by one with a plurality of windings of intermediate frequency transformer low pressure side respectively, and the output of each the 2nd H bridge power conversion module is in parallel consists of low pressure square end mouth.
Further, described intermediate frequency transformer is comprised of a plurality of high pressure sides winding and a plurality of low pressure sides winding; Described high frequency modulated part is comprised of a plurality of H bridge power conversion modules, the output of each H bridge power conversion module is connected one by one with a plurality of high pressure sides winding of intermediate frequency transformer, and each H bridge power conversion module input is followed in series to form high pressure square end mouth; Described high frequency reduction part is comprised of a plurality of the 2nd H bridge power conversion modules, the input of each the 2nd H bridge power conversion module is connected one by one with a plurality of windings of intermediate frequency transformer low pressure side respectively, and the output of each the 2nd H bridge power conversion module is in parallel consists of low pressure square end mouth.
Further, described intermediate frequency transformer is a plurality of, and each intermediate frequency transformer is comprised of high pressure side's winding and low pressure side's winding; Described high frequency modulated part is comprised of a plurality of H bridge power conversion modules, the output of a plurality of H bridge power conversion modules is connected one by one with high pressure side's winding of a plurality of intermediate frequency transformers, and each H bridge power conversion module input is followed in series to form high pressure square end mouth; Described high frequency reduction part is comprised of a plurality of the 2nd H bridge power conversion modules, the input of a plurality of the 2nd H bridge power conversion modules is connected one by one with a plurality of low pressure sides winding of a plurality of intermediate frequency transformers, the output of each the 2nd H bridge power conversion module formation in parallel low pressure square end mouth.
The utlity model has following technique effect:
(1) the utility model is in application, every phase brachium pontis of modular multi-level converter is comprised of module, be with good expansibility, can expand to easily very high electric pressure and power level, therefore can remove the power frequency excitation transformer that rated voltage is higher, volume is larger, add at isolation level that rated voltage is lower, the intermediate frequency transformer of small volume.
(2) due to the employing modularized design, thereby can realize higher level number, the alternating current-direct current harmonic component can greatly reduce, and the capacity of filter and volume also can correspondingly reduce.
(3) in the harmonic wave allowed band, can suitably reduce switching frequency, reduce switching loss, improve the efficient of system.
(4) adopt certain control strategy, can control flexibly the two-way flow of reactive power, for electric power system provides positive damping, effectively suppress electric power system low frequency/ultra-low frequency oscillation, improve stability of power system.
(5) there is no the commutation failure problem of traditional thyristor-type self-shunt excitation system, have higher reliability.
Description of drawings
Fig. 1 is the utility model structural representation.
Fig. 2 is the half-bridge sub modular structure schematic diagram of modular multi-level converter.
Fig. 3 is the first isolation level structural representation.
Fig. 4 is the second isolation level structural representation.
Fig. 5 is the third isolation level structural representation.
Fig. 6 is the excitation coil structure schematic diagram.
Embodiment
Below by by example, the utility model being described in further detail, but following examples are only illustrative, and protection range of the present utility model is not subjected to the restriction of these embodiment.
As shown in Figure 1, the utility model system of providing comprises modular multi-level converter 3, isolation level 4 and magnet exciting coil 5; The interchange port a of modular multi-level converter 3 directly is connected with synchronous generator machine end, and the DC port b of modular multi-level converter 3 is connected with the high pressure square end mouth c of isolation level 4, and the low pressure square end mouth d of isolation level 4 connects the port e of magnet exciting coil 5.Modular multi-level converter 3 is converted to direct current with interchange, and isolation level 4 is converted to low pressure with high pressure, and magnet exciting coil 5 produces exciting current.
As shown in Figure 2, modular multi-level converter includes three-phase three bridge arm circuit, every circuitry phase includes upper and lower two brachium pontis, on each, brachium pontis and lower brachium pontis include N based on half-bridge submodule 1 and a current limiting reactor of full control switching device, N half-bridge submodule connected successively, after an end after series connection is connected with current limiting reactor, as exchanging port a, the other end is as DC port b.Half-bridge submodule 1 is comprised of a half-bridge circuit and Capacitance parallel connection.
Fig. 3 provides isolation level the first execution mode, and isolation level 4 is comprised of high frequency modulated part, intermediate frequency transformer and high frequency reduction part; The high frequency modulated part, formed by M H bridge power conversion module, each H bridge power conversion module is connected with high pressure side's winding of intermediate frequency transformer after connecting successively by brachium pontis mid point port, and each H bridge power conversion module is followed in series to form high pressure square end mouth c by the another port outside brachium pontis mid point port; High frequency reduction part is comprised of P H bridge power conversion module, and brachium pontis mid point port is connected one by one with P winding of intermediate frequency transformer low pressure side respectively, and each H bridge power conversion module is by the parallel connection of the another port outside brachium pontis mid point port formation low pressure square end mouth d.M and P are according to the generator terminal voltage classification, and electric pressure is higher, and M and P are larger.
Fig. 4 is the second isolation level structural representation, be that with the difference of Fig. 3 the high pressure side of intermediate frequency transformer is made of M winding, each H bridge power conversion module brachium pontis mid point port of high frequency modulated part directly is connected one by one with a high pressure side M winding of intermediate frequency transformer.
Fig. 5 is the third isolation level structural representation, be that with the difference of Fig. 3 isolation level comprises a plurality of intermediate frequency transformers and consists of, each intermediate frequency transformer high pressure side and low pressure side are a winding, high pressure side's winding is connected with the brachium pontis mid point port of a power conversion module of high frequency modulated part, and low pressure side's winding is connected with the brachium pontis mid point port of a power conversion module of high frequency reduction part.
Fig. 6 is the excitation coil structure schematic diagram, is made of field suppression switch, nonlinear resistance and excitation winding, and connecting with field suppression switch after nonlinear resistance and excitation winding parallel connection consists of port e.
The utility model is by regulating the function of duty ratio to realize that exciting voltage is started from scratch and risen of isolation level DC/DC contactor device; Provide damping by DC excitation and control AC reactive power for electric power system, thereby suppress electric power system low frequency/ultra-low frequency oscillation, improve stability of power system.
Those skilled in the art will readily understand; the above is only preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection range of the present utility model.
Claims (7)
1. the self-shunt excitation system based on modular multi-level converter, is characterized in that, comprises modular multi-level converter, isolation level and magnet exciting coil; The interchange port of modular multi-level converter directly is connected with synchronous generator machine end, and the DC port of modular multi-level converter is connected with the high pressure square end mouth of isolation level, and the low pressure square end mouth of isolation level connects the port of magnet exciting coil.
2. the self-shunt excitation system based on modular multi-level converter according to claim 1, it is characterized in that, described modular multi-level converter comprises three-phase three bridge arm circuit, every circuitry phase includes upper and lower two brachium pontis, on each, brachium pontis and lower brachium pontis include a plurality of half-bridge submodules and a current limiting reactor, a plurality of half-bridge submodules are connected successively, and after the end after series connection is connected with current limiting reactor, as exchanging port, the other end is as DC port.
3. the self-shunt excitation system based on modular multi-level converter according to claim 2, is characterized in that, described half-bridge submodule is comprised of a half-bridge circuit and Capacitance parallel connection.
4. according to claim 1 and 2 or 3 described self-shunt excitation systems based on modular multi-level converter, it is characterized in that, described isolation level comprises high frequency modulated part, intermediate frequency transformer and high frequency reduction part, the input of high frequency modulated part is high pressure square end mouth, the output of high frequency modulated part connects high pressure side's winding of intermediate frequency transformer, low pressure side's winding of intermediate frequency transformer connects the input of high frequency reduction part, and the output of high frequency reduction part is low pressure square end mouth.
5. the self-shunt excitation system based on modular multi-level converter according to claim 4, is characterized in that, described intermediate frequency transformer is comprised of high pressure side's winding and a plurality of low pressure sides winding; Described high frequency modulated part is comprised of a plurality of H bridge power conversion modules, be connected with high pressure side's winding of intermediate frequency transformer after the output of each H bridge power conversion module is connected successively, each H bridge power conversion module input is followed in series to form high pressure square end mouth; Described high frequency reduction part is comprised of a plurality of the 2nd H bridge power conversion modules, the input of each the 2nd H bridge power conversion module is connected one by one with a plurality of windings of intermediate frequency transformer low pressure side respectively, and the output of each the 2nd H bridge power conversion module is in parallel consists of low pressure square end mouth.
6. the self-shunt excitation system based on modular multi-level converter according to claim 4, is characterized in that, described intermediate frequency transformer is comprised of a plurality of high pressure sides winding and a plurality of low pressure sides winding; Described high frequency modulated part is comprised of a plurality of H bridge power conversion modules, the output of each H bridge power conversion module is connected one by one with a plurality of high pressure sides winding of intermediate frequency transformer, and each H bridge power conversion module input is followed in series to form high pressure square end mouth; Described high frequency reduction part is comprised of a plurality of the 2nd H bridge power conversion modules, the input of each the 2nd H bridge power conversion module is connected one by one with a plurality of windings of intermediate frequency transformer low pressure side respectively, and the output of each the 2nd H bridge power conversion module is in parallel consists of low pressure square end mouth.
7. the self-shunt excitation system based on modular multi-level converter according to claim 4, is characterized in that, described intermediate frequency transformer is a plurality of, and each intermediate frequency transformer is comprised of high pressure side's winding and low pressure side's winding; Described high frequency modulated part is comprised of a plurality of H bridge power conversion modules, the output of a plurality of H bridge power conversion modules is connected one by one with high pressure side's winding of a plurality of intermediate frequency transformers, and each H bridge power conversion module input is followed in series to form high pressure square end mouth; Described high frequency reduction part is comprised of a plurality of the 2nd H bridge power conversion modules, the input of a plurality of the 2nd H bridge power conversion modules is connected one by one with a plurality of low pressure sides winding of a plurality of intermediate frequency transformers, the output of each the 2nd H bridge power conversion module formation in parallel low pressure square end mouth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220696244 CN202978804U (en) | 2012-12-14 | 2012-12-14 | Self-shunt-excited excitation system based on modular multilevel converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220696244 CN202978804U (en) | 2012-12-14 | 2012-12-14 | Self-shunt-excited excitation system based on modular multilevel converter |
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| CN202978804U true CN202978804U (en) | 2013-06-05 |
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| CN 201220696244 Expired - Fee Related CN202978804U (en) | 2012-12-14 | 2012-12-14 | Self-shunt-excited excitation system based on modular multilevel converter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103051267A (en) * | 2012-12-14 | 2013-04-17 | 湖北省电力公司 | Self and shunt excitation system based on modular multi-level converter |
| US9537421B2 (en) | 2014-08-22 | 2017-01-03 | General Electric Company | Multilevel converter |
-
2012
- 2012-12-14 CN CN 201220696244 patent/CN202978804U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103051267A (en) * | 2012-12-14 | 2013-04-17 | 湖北省电力公司 | Self and shunt excitation system based on modular multi-level converter |
| US9537421B2 (en) | 2014-08-22 | 2017-01-03 | General Electric Company | Multilevel converter |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130605 Termination date: 20181214 |
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| CF01 | Termination of patent right due to non-payment of annual fee |