CN203537293U - Self-parallel excitation system based on three single-phase H-bridge converters - Google Patents
Self-parallel excitation system based on three single-phase H-bridge converters Download PDFInfo
- Publication number
- CN203537293U CN203537293U CN201320742149.8U CN201320742149U CN203537293U CN 203537293 U CN203537293 U CN 203537293U CN 201320742149 U CN201320742149 U CN 201320742149U CN 203537293 U CN203537293 U CN 203537293U
- Authority
- CN
- China
- Prior art keywords
- phase
- pressure side
- isolation level
- intermediate frequency
- transformer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 230000005284 excitation Effects 0.000 title claims abstract description 33
- 238000002955 isolation Methods 0.000 claims abstract description 61
- 230000001360 synchronised effect Effects 0.000 claims abstract description 12
- 238000006243 chemical reaction Methods 0.000 claims description 39
- 238000004804 winding Methods 0.000 claims description 31
- 230000009467 reduction Effects 0.000 claims description 26
- 230000015572 biosynthetic process Effects 0.000 claims description 13
- 239000003990 capacitor Substances 0.000 claims description 4
- 230000010355 oscillation Effects 0.000 abstract description 9
- 238000011217 control strategy Methods 0.000 abstract description 2
- 238000013016 damping Methods 0.000 abstract description 2
- 230000000452 restraining effect Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
Images
Abstract
The utility model provides a self-parallel excitation system based on three single-phase H-bridge converters. The system comprises three single-phase H-bridge converters, an isolation level, and an excitation coil. The three single-phase H-bridge converters comprise three single-phase converters. Input ends ABC of the three single-phase H-bridge converters are directly connected with an end of a synchronous generator. Output ends of the three single-phase H-bridge converters are connected with input ends of the isolation level, and the other port of the isolation level is connected with the excitation coil. The three single-phase H-bridge converters whose structure and control strategy are simple are used, and the three single-phase H-bridge converters are suitable for high-voltage and high-power places, so an exciting transformer on a high-voltage AC side can be removed, and positive damping can be provided for an electric power system through DC excitation and control of reactive power on an AC side, thereby effectively restraining low frequency/ultralow frequency oscillation of the electric power system and improving stability of the electric power system.
Description
Technical field
The utility model belongs to generator excitation technical field, is specifically related to a kind of self-shunt excitation system based on current transformer, particularly a kind of self-shunt excitation system based on 3 single-phase H bridge current transformer.
Background technology
Along with electric power system is grid-connected on a large scale, the reliability that electric power system controls excitation and dynamic property require more and more higher, and 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 conventional self-shunt excitation system has been difficult to suppress the wide region low-frequency oscillation of 0.1Hz ~ 3Hz.When electric power system generation low frequency/ultra-low frequency oscillation, synchronous generator set end voltage is also incited somebody to action thereupon significantly low frequency/ultra-low frequency oscillation, and likely the long period continues at reduced levels set end voltage.In the duration of oscillation, if system is short-circuited, fault maybe needs to augment idle, requires self-shunt excitation system forced exciting or strengthens excitation.Once there is excitation scarce capacity, systematic failures will be magnified.
Summary of the invention
The purpose of this utility model is to propose a kind ofly can effectively suppress electric power system low frequency/ultra-low frequency oscillation, improves the self-shunt excitation system based on 3 single-phase H bridge type current transformer of stability of power system.The utility model is applicable to high voltage, powerful application scenario.
The technical solution of the utility model is: the self-shunt excitation system based on 3 single-phase H bridge type current transformer of the present utility model, comprise 3 single-phase H bridge type current transformer, isolation level, magnet exciting coil, described 3 single-phase H bridge type current transformer comprises three single-phase converters, the input ABC of 3 single-phase H bridge type current transformer is directly connected with synchronous generator machine end, the output of 3 single-phase H bridge type current transformer is connected with the input of isolation level, and another port of isolation level is connected with magnet exciting coil.
The AC of above-mentioned 3 single-phase H bridge type current transformer is directly connected with synchronous generator machine end, and the DC terminal of 3 single-phase H bridge type current transformer is connected with the high pressure square end mouth of isolation level, and the low pressure square end mouth of isolation level connects magnet exciting coil.
Each of above-mentioned 3 single-phase H bridge type current transformer is in series by M full bridge power conversion module, and each full bridge power changes output and the Parallel-connected Capacitor of module.
Above-mentioned isolation level is comprised of high frequency modulated part, mid portion and high frequency reduction part; Isolation level is high frequency modulated part by high pressure side's side, often M H bridge power conversion module, consists of, and by the end line of high pressure side's side, is connected respectively with single-phase H bridge type current transformer, leans on the end line of intermediate frequency transformer side to be connected with M winding of intermediate frequency transformer high pressure side respectively; Isolation level is high frequency reduction part by low pressure side's side, often by N H bridge power conversion module, formed, two end lines of each power conversion module DC side are formation DC port in parallel successively, leans on two end lines of intermediate frequency transformer device side to be connected successively with N winding of three intermediate frequency transformer low pressure sides respectively.
Above-mentioned isolation level is comprised of high frequency modulated part, mid portion and high frequency reduction part, and isolation level is high frequency modulated part by high pressure side's side, often M full bridge power conversion module, consists of; Isolation level is high frequency reduction part by low pressure side's side, often N full bridge power conversion module, consists of; Isolation level mid portion consists of three intermediate frequency transformers, and the high pressure side of each intermediate frequency transformer consists of M winding, and low pressure side consists of N winding; The every phase power conversion module that forms high frequency modulated part leans on the end line of high pressure side's side to be connected with single-phase H bridge type current transformer respectively, leans on the end line of intermediate frequency transformer side to be connected with M winding of intermediate frequency transformer high pressure side respectively; Two end lines parallel connection formation successively DC port that forms every phase power conversion module DC side of high frequency reduction part, is connected with N winding of intermediate frequency transformer low pressure side respectively by intermediate frequency transformer side line.
Above-mentioned isolation level is comprised of high frequency modulated part, mid portion and high frequency reduction part; Isolation level is high frequency modulated part by high pressure side's side, often M full bridge power conversion module, consists of; Isolation level is high frequency reduction part by low pressure side's side, often M full bridge power conversion module, consists of; Isolation level mid portion is every to be formed by M intermediate frequency transformer, and the high pressure side of each intermediate frequency transformer and low pressure side form by a winding; The every phase power conversion module that forms high frequency modulated part leans on the end line of high pressure side's side to be connected with single-phase H bridge type current transformer respectively, leans on the end line of intermediate frequency transformer side to be connected with a winding of intermediate frequency transformer high pressure side respectively; Two end lines parallel connection formation successively DC port that forms every phase power conversion module DC side of high frequency reduction part, is connected with a winding of intermediate frequency transformer low pressure side respectively by intermediate frequency transformer side line.
Above-mentioned isolation level is comprised of high frequency modulated part, mid portion and high frequency reduction part; Isolation level is high frequency modulated part by high pressure side's side, often M full bridge power conversion module, consists of; Isolation level is high frequency reduction part by low pressure side's side, N full bridge power conversion module, consists of; Isolation level mid portion consists of an intermediate frequency transformer, and the high pressure side of each intermediate frequency transformer is by P(P=3M) individual winding formation, low pressure side consists of N winding; Each power conversion module of every phase composition high frequency modulated part is connected with single-phase H bridge type current transformer respectively by the end line of high pressure side's side, leans on the end line of intermediate frequency transformer side to be connected with M winding of intermediate frequency transformer high pressure side respectively; Two end lines parallel connection formation successively DC port that forms each power conversion module DC side of high frequency reduction part, is connected with N winding of intermediate frequency transformer low pressure side respectively by intermediate frequency transformer side line.
The utlity model has following technique effect:
(1) DC capacitor voltage of the utility model 3 single-phase H bridge type current transformer is easy to stable control, can improve the stability of excitation system.
(2) the utility model adopts multi-module cascade multilevel converter and phase-shifting carrier wave technology, can, compared with under low switching frequency, still guarantee that this self-shunt excitation system has good input-output characteristic.
(3) the H bridge power model that the every phase of the utility model AC current transformer is all equated by quantity is in series, 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, at isolation level, add that rated voltage is lower, the intermediate frequency transformer of small volume.
(4) the utility model can be controlled the two-way flow of reactive power flexibly by adopting certain control strategy, for electric power system provides positive damping, effectively suppresses electric power system low frequency/ultra-low frequency oscillation, improves stability of power system.
(5) the utility model does not have the commutation failure problem of traditional thyristor-type self-shunt excitation system, has higher reliability.
The utility model is a kind ofly can effectively suppress electric power system low frequency/ultra-low frequency oscillation, improves the self-shunt excitation system based on 3 single-phase H bridge type current transformer of stability of power system.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Fig. 2 is the structural representation of single-phase H bridge type converter.
Fig. 3 is the structural representation of magnet exciting coil.
Fig. 4 is the structural representation of the utility model the first isolation level.
Fig. 5 is the structural representation of the utility model the second isolation level.
Fig. 6 is the structural representation of the third isolation level of the utility model.
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 subject to the restriction of these embodiment.
As shown in Figure 1, the self-shunt excitation system based on 3 single-phase H bridge type current transformer of the present utility model, comprises 3 single-phase H bridge type current transformer 3, isolation level 4, magnet exciting coil 5.Described 3 single-phase H bridge type current transformer comprises three single-phase converters 2, each single-phase converter 2 is in series by M full bridge power conversion module 1, the input ABC of 3 single-phase H bridge type current transformer 3 is directly connected with synchronous generator machine end, the output of 3 single-phase H bridge type current transformer 3 is connected with the input of isolation level 4, and another port of isolation level 4 is connected with magnet exciting coil 5.
The AC of above-mentioned 3 single-phase H bridge type current transformer 3 is directly connected with synchronous generator machine end, and the DC terminal of 3 single-phase H bridge type current transformer 3 is connected with the high pressure square end mouth of isolation level 4, and the low pressure square end mouth of isolation level 4 connects magnet exciting coil 5.
As shown in Figure 4, the structure of magnet exciting coil 5 as shown in Figure 3 for the structure of the utility model isolation level 4.
Each of above-mentioned 3 single-phase H bridge type current transformer is in series by M full bridge power conversion module, and as shown in Figure 2, each full bridge power changes output and the Parallel-connected Capacitor of module; The input ABC of 3 single-phase H bridge type current transformer 3 is directly connected with synchronous generator machine end, and output is connected with the input of isolation level 4, and another port of isolation level 4 is connected with magnet exciting coil 5.
Fig. 4 is the first structural representation of isolation level 4, and isolation level 4 is comprised of high frequency modulated part, mid portion and high frequency reduction part; Isolation level is high frequency modulated part by high pressure side's side, often M H bridge power conversion module, consists of, and by the end line of high pressure side's side, is connected respectively with single-phase H bridge type current transformer, leans on the end line of intermediate frequency transformer side to be connected with M winding of intermediate frequency transformer high pressure side respectively; Isolation level is high frequency reduction part by low pressure side's side, often by N H bridge power conversion module, formed, two end lines of each power conversion module DC side are formation DC port in parallel successively, leans on two end lines of intermediate frequency transformer device side to be connected successively with N winding of three intermediate frequency transformer low pressure sides respectively.
Fig. 5 is the second structural representation of isolation level 4, be that with the difference of Fig. 4 mid portion is every by M intermediate frequency transformer formation, high pressure side and low pressure side form by a winding, respectively with high frequency modulated part and high frequency reduction each power conversion module partly successively corresponding connection.
Fig. 6 is the third structural representation of isolation level 4, be that with the difference of Fig. 4 mid portion consists of an intermediate frequency transformer, high pressure side is by P(P=3M) individual winding formation, low pressure side consists of N winding, respectively with high frequency modulated part and high frequency reduction each power conversion module partly successively corresponding connection.
Determining of the value of above-mentioned M, N mainly carried out according to following principle:
(1) choosing of M: determined by the designed operating voltage of self-shunt excitation system based on three-phase H bridge type current transformer and the cooperation between the withstand voltage level of device used, as 10kV system, if select the switching device of 3300V, often need mutually 6 module-cascades, now M is 6.
(2) choosing of N: determined by the required exciting voltage of synchronous generator and excitation capacity.
Those skilled in the art will readily understand; the foregoing 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 3 single-phase H bridge type current transformer, it is characterized in that: comprise 3 single-phase H bridge type current transformer, isolation level, magnet exciting coil, described 3 single-phase H bridge type current transformer comprises three single-phase converters, the input ABC of 3 single-phase H bridge type current transformer is directly connected with synchronous generator machine end, the output of 3 single-phase H bridge type current transformer is connected with the input of isolation level, and another port of isolation level is connected with magnet exciting coil.
2. the self-shunt excitation system based on 3 single-phase H bridge type current transformer according to claim 1, the AC that it is characterized in that above-mentioned 3 single-phase H bridge type current transformer is directly connected with synchronous generator machine end, the DC terminal of 3 single-phase H bridge type current transformer is connected with the high pressure square end mouth of isolation level, and the low pressure square end mouth of isolation level connects magnet exciting coil.
3. the self-shunt excitation system based on 3 single-phase H bridge type current transformer according to claim 1, it is characterized in that above-mentioned 3 single-phase H bridge type current transformer each is in series by M full bridge power conversion module, each full bridge power changes output and the Parallel-connected Capacitor of module.
4. according to the self-shunt excitation system based on 3 single-phase H bridge type current transformer described in claims 1 to 3 any one, it is characterized in that above-mentioned isolation level is comprised of high frequency modulated part, mid portion and high frequency reduction part; Isolation level is high frequency modulated part by high pressure side's side, often M H bridge power conversion module, consists of, and by the end line of high pressure side's side, is connected respectively with single-phase H bridge type current transformer, leans on the end line of intermediate frequency transformer side to be connected with M winding of intermediate frequency transformer high pressure side respectively; Isolation level is high frequency reduction part by low pressure side's side, often by N H bridge power conversion module, formed, two end lines of each power conversion module DC side are formation DC port in parallel successively, leans on two end lines of intermediate frequency transformer device side to be connected successively with N winding of three intermediate frequency transformer low pressure sides respectively.
5. according to the self-shunt excitation system based on 3 single-phase H bridge type current transformer described in claims 1 to 3 any one, it is characterized in that above-mentioned isolation level is comprised of high frequency modulated part, mid portion and high frequency reduction part, isolation level is high frequency modulated part by high pressure side's side, often M full bridge power conversion module, consists of; Isolation level is high frequency reduction part by low pressure side's side, often N full bridge power conversion module, consists of; Isolation level mid portion consists of three intermediate frequency transformers, and the high pressure side of each intermediate frequency transformer consists of M winding, and low pressure side consists of N winding; The every phase power conversion module that forms high frequency modulated part leans on the end line of high pressure side's side to be connected with single-phase H bridge type current transformer respectively, leans on the end line of intermediate frequency transformer side to be connected with M winding of intermediate frequency transformer high pressure side respectively; Two end lines parallel connection formation successively DC port that forms every phase power conversion module DC side of high frequency reduction part, is connected with N winding of intermediate frequency transformer low pressure side respectively by intermediate frequency transformer side line.
6. according to the self-shunt excitation system based on 3 single-phase H bridge type current transformer described in claims 1 to 3 any one, it is characterized in that above-mentioned isolation level is comprised of high frequency modulated part, mid portion and high frequency reduction part; Isolation level is high frequency modulated part by high pressure side's side, often M full bridge power conversion module, consists of; Isolation level is high frequency reduction part by low pressure side's side, often M full bridge power conversion module, consists of; Isolation level mid portion is every to be formed by M intermediate frequency transformer, and the high pressure side of each intermediate frequency transformer and low pressure side form by a winding; The every phase power conversion module that forms high frequency modulated part leans on the end line of high pressure side's side to be connected with single-phase H bridge type current transformer respectively, leans on the end line of intermediate frequency transformer side to be connected with a winding of intermediate frequency transformer high pressure side respectively; Two end lines parallel connection formation successively DC port that forms every phase power conversion module DC side of high frequency reduction part, is connected with a winding of intermediate frequency transformer low pressure side respectively by intermediate frequency transformer side line.
7. according to the self-shunt excitation system based on 3 single-phase H bridge type current transformer described in claims 1 to 3 any one, it is characterized in that above-mentioned isolation level is comprised of high frequency modulated part, mid portion and high frequency reduction part; Isolation level is high frequency modulated part by high pressure side's side, often M full bridge power conversion module, consists of; Isolation level is high frequency reduction part by low pressure side's side, N full bridge power conversion module, consists of; Isolation level mid portion consists of an intermediate frequency transformer, and the high pressure side of each intermediate frequency transformer is by P(P=3M) individual winding formation, low pressure side consists of N winding; Each power conversion module of every phase composition high frequency modulated part is connected with single-phase H bridge type current transformer respectively by the end line of high pressure side's side, leans on the end line of intermediate frequency transformer side to be connected with M winding of intermediate frequency transformer high pressure side respectively; Two end lines parallel connection formation successively DC port that forms each power conversion module DC side of high frequency reduction part, is connected with N winding of intermediate frequency transformer low pressure side respectively by intermediate frequency transformer side line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320742149.8U CN203537293U (en) | 2013-11-22 | 2013-11-22 | Self-parallel excitation system based on three single-phase H-bridge converters |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320742149.8U CN203537293U (en) | 2013-11-22 | 2013-11-22 | Self-parallel excitation system based on three single-phase H-bridge converters |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203537293U true CN203537293U (en) | 2014-04-09 |
Family
ID=50423464
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320742149.8U Expired - Fee Related CN203537293U (en) | 2013-11-22 | 2013-11-22 | Self-parallel excitation system based on three single-phase H-bridge converters |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203537293U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103825515A (en) * | 2013-11-22 | 2014-05-28 | 南方电网科学研究院有限责任公司 | Self-shunt excitation system based on converter |
-
2013
- 2013-11-22 CN CN201320742149.8U patent/CN203537293U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103825515A (en) * | 2013-11-22 | 2014-05-28 | 南方电网科学研究院有限责任公司 | Self-shunt excitation system based on converter |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Van den Broeck et al. | A critical review of power quality standards and definitions applied to DC microgrids | |
| US8917047B2 (en) | Converter system | |
| CN104685771A (en) | Power conversion device | |
| CN105958816B (en) | A kind of multiple-unit diode capacitance network and coupling inductance high-gain DC converter | |
| CN110148960B (en) | Power conversion circuit, inverter and control method | |
| CN102195289A (en) | Cascade-structure-based hybrid active power filter | |
| CN105245123A (en) | One-dimensional modulation common-mode current suppression technology for three-phase neutral point-clamped three-level inverter | |
| CN101834451A (en) | High-voltage back-to-back converter | |
| CN104934995A (en) | UPQC with uninterrupted power source function | |
| CN201975800U (en) | Alternating-current permanent magnet synchronous generator system driven by semi-control converters | |
| CN103888004A (en) | Single-phase PWM rectifier for railway AC/DC/AC standby power supply | |
| CN203537293U (en) | Self-parallel excitation system based on three single-phase H-bridge converters | |
| CN202978804U (en) | Self-shunt-excited excitation system based on modular multilevel converter | |
| CN102412777B (en) | Self shunt excitation control system of series structure of three current-mode single-phase bridge-type convertors | |
| CN103326650A (en) | Self-shunt excitation system of electric generator | |
| CN103825515A (en) | Self-shunt excitation system based on converter | |
| CN103051267A (en) | Self and shunt excitation system based on modular multi-level converter | |
| CN205141696U (en) | Direct current transmission return circuit that can restrain HVDC system direct current side low order resonance | |
| CN202334426U (en) | Self-shunt-excitation excitation control system | |
| CN210608555U (en) | High-speed railway unbalance optimization compensation device based on negative sequence injection | |
| CN101593982B (en) | Self and shunt excitation system based on parallel multiple current source converters | |
| CN107181262B (en) | Dynamic voltage recovery device for cross power taking and working method thereof | |
| CN202150822U (en) | Four-quadrant frequency-converter main circuit used for constant-power wide range speed control of permanent magnet synchronous motor | |
| CN101521446B (en) | Self-shunt excitation system based on parallel-connection multiple-voltage type convertor | |
| CN201388181Y (en) | Self-excitation system based on parallel-connected multiple voltage-type current transformer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140409 |