CN103825515A - Self-shunt excitation system based on converter - Google Patents
Self-shunt excitation system based on converter Download PDFInfo
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- CN103825515A CN103825515A CN201310592167.7A CN201310592167A CN103825515A CN 103825515 A CN103825515 A CN 103825515A CN 201310592167 A CN201310592167 A CN 201310592167A CN 103825515 A CN103825515 A CN 103825515A
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Abstract
The invention provides a self-shunt excitation system based on a converter. The self-shunt excitation system comprises a three single-phase H-bridge-type converter, an isolation level and an excitation coil. The three single-phase H-bridge-type converter comprises three single-phase converters, wherein the input terminals A, B and C of the three single-phase H-bridge-type converter are directly connected with the terminal of a synchronous generator; the output terminals of the three single-phase H-bridge-type converter are connected with the input terminals of the isolation level; and the other port of the isolation level is connected with the excitation coil. The three single-phase H-bridge-type converter which is simple in structure and simple in control strategy is utilized, and the self-shunt excitation system is suitable for high-voltage high-power application occasions, so that an excitation transformer at the high-voltage alternating current side can be omitted, an electric power system is provided with positive damping through direct current excitation and controlling AC side reactive power, low-frequency/ultralow-frequency oscillation of the electrical power system is effectively suppressed, and stability of the electrical power system is improved.
Description
Technical field
The invention belongs to generator excitation technical field, be 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, reliability and the dynamic property requirement of electric power system to excitation control is more and more higher, and synchronous generator self-shunt excitation system becomes the major way of domestic and international excitation control with its unique advantage.Modern power systems requires synchronous generator excited system can suppress 0.1Hz ~ 3Hz low frequency/ultra-low frequency oscillation, but conventional self-shunt excitation system has been difficult to suppress the wide region low-frequency oscillation of 0.1Hz ~ 3Hz.In the time of 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 need to augment idle, require self-shunt excitation system forced exciting or strengthen excitation.Once there is excitation scarce capacity, systematic failures will be magnified.
Summary of the invention
The object of the invention is to propose one and can effectively suppress electric power system low frequency/ultra-low frequency oscillation, improve the self-shunt excitation system based on current transformer of stability of power system.The present invention is applicable to high voltage, powerful application scenario.
Technical scheme of the present invention is: the self-shunt excitation system based on current transformer of the present invention, 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 made up 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, is often made up of M H bridge power conversion module, is connected respectively by the end line of high pressure side's side 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 formed by N H bridge power conversion module, two end lines of each power conversion module DC side are formation DC port in parallel successively, is connected successively respectively by two end lines of intermediate frequency transformer device side with N winding of three intermediate frequency transformer low pressure sides.
Above-mentioned isolation level is made up 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, is often made up of M full bridge power conversion module; Isolation level is high frequency reduction part by low pressure side's side, is often made up of N full bridge power conversion module; Isolation level mid portion is made up of three intermediate frequency transformers, and the high pressure side of each intermediate frequency transformer is made up of M winding, and low pressure side is made up of N winding; Every phase power conversion module of 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, is connected respectively by the end line of intermediate frequency transformer side with M winding of intermediate frequency transformer high pressure side; Two end lines of every phase power conversion module DC side of composition high frequency reduction part formation DC port in parallel successively, is connected with N winding of intermediate frequency transformer low pressure side respectively by intermediate frequency transformer side line.
Above-mentioned isolation level is made up 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, is often made up of M full bridge power conversion module; Isolation level is high frequency reduction part by low pressure side's side, is often made up of M full bridge power conversion module; Isolation level mid portion is every by M intermediate frequency transformer composition, and the high pressure side of each intermediate frequency transformer and low pressure side form by a winding; Every phase power conversion module of 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, is connected respectively by the end line of intermediate frequency transformer side with a winding of intermediate frequency transformer high pressure side; Two end lines of every phase power conversion module DC side of composition high frequency reduction part formation DC port in parallel successively, is connected with a winding of intermediate frequency transformer low pressure side respectively by intermediate frequency transformer side line.
Above-mentioned isolation level is made up 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, is often made up of M full bridge power conversion module; Isolation level is high frequency reduction part by low pressure side's side, is made up of N full bridge power conversion module; Isolation level mid portion is made up 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 is made up 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, is connected respectively by the end line of intermediate frequency transformer side with M winding of intermediate frequency transformer high pressure side; Two end lines of each power conversion module DC side of composition high frequency reduction part formation DC port in parallel successively, is connected with N winding of intermediate frequency transformer low pressure side respectively by intermediate frequency transformer side line.
The present invention has following technique effect:
(1) DC capacitor voltage of 3 single-phase H bridge type current transformer of the present invention is easy to stable control, can improve the stability of excitation system.
(2) the present invention 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 AC current transformer of the present invention 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, add at isolation level that rated voltage is lower, the intermediate frequency transformer of small volume.
(4) the present invention can, by adopting certain control strategy, can control the two-way flow of reactive power flexibly, 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 present invention does not have the commutation failure problem of traditional thyristor-type self-shunt excitation system, has higher reliability.
The present invention is that one can effectively suppress electric power system low frequency/ultra-low frequency oscillation, improves the self-shunt excitation system based on current transformer of stability of power system.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
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 first isolation level of the present invention.
Fig. 5 is the structural representation of the second isolation level of the present invention.
Fig. 6 is the structural representation of the third isolation level of the present invention.
Embodiment
Below by by example, the present invention being described in further detail, but following examples are only illustrative, and protection scope of the present invention is not subject to the restriction of these embodiment.
As shown in Figure 1, the self-shunt excitation system based on current transformer of the present invention, 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 isolation level 4 of the present invention.
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 made up 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, is often made up of M H bridge power conversion module, is connected respectively by the end line of high pressure side's side 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 formed by N H bridge power conversion module, two end lines of each power conversion module DC side are formation DC port in parallel successively, is connected successively respectively by two end lines of intermediate frequency transformer device side with N winding of three intermediate frequency transformer low pressure sides.
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 corresponding connection successively partly.
Fig. 6 is the third structural representation of isolation level 4, be that with the difference of Fig. 4 mid portion is made up of an intermediate frequency transformer, high pressure side is by P(P=3M) individual winding formation, low pressure side is made up of N winding, respectively with high frequency modulated part and high frequency reduction each power conversion module corresponding connection successively partly.
Determining of the value of above-mentioned M, N mainly carried out according to following principle:
(1) choosing of M: determined by the cooperation between the designed operating voltage of self-shunt excitation system and the withstand voltage level of device used based on three-phase H bridge type current transformer, 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 invention; not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (7)
1. the self-shunt excitation system based on 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 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 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 current transformer described in claims 1 to 3 any one, it is characterized in that above-mentioned isolation level is made up 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, is often made up of M H bridge power conversion module, is connected respectively by the end line of high pressure side's side 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 formed by N H bridge power conversion module, two end lines of each power conversion module DC side are formation DC port in parallel successively, is connected successively respectively by two end lines of intermediate frequency transformer device side with N winding of three intermediate frequency transformer low pressure sides.
5. according to the self-shunt excitation system based on current transformer described in claims 1 to 3 any one, it is characterized in that above-mentioned isolation level is made up 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, is often made up of M full bridge power conversion module; Isolation level is high frequency reduction part by low pressure side's side, is often made up of N full bridge power conversion module; Isolation level mid portion is made up of three intermediate frequency transformers, and the high pressure side of each intermediate frequency transformer is made up of M winding, and low pressure side is made up of N winding; Every phase power conversion module of 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, is connected respectively by the end line of intermediate frequency transformer side with M winding of intermediate frequency transformer high pressure side; Two end lines of every phase power conversion module DC side of composition high frequency reduction part formation DC port in parallel successively, 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 current transformer described in claims 1 to 3 any one, it is characterized in that above-mentioned isolation level is made up 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, is often made up of M full bridge power conversion module; Isolation level is high frequency reduction part by low pressure side's side, is often made up of M full bridge power conversion module; Isolation level mid portion is every by M intermediate frequency transformer composition, and the high pressure side of each intermediate frequency transformer and low pressure side form by a winding; Every phase power conversion module of 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, is connected respectively by the end line of intermediate frequency transformer side with a winding of intermediate frequency transformer high pressure side; Two end lines of every phase power conversion module DC side of composition high frequency reduction part formation DC port in parallel successively, 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 current transformer described in claims 1 to 3 any one, it is characterized in that above-mentioned isolation level is made up 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, is often made up of M full bridge power conversion module; Isolation level is high frequency reduction part by low pressure side's side, is made up of N full bridge power conversion module; Isolation level mid portion is made up 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 is made up 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, is connected respectively by the end line of intermediate frequency transformer side with M winding of intermediate frequency transformer high pressure side; Two end lines of each power conversion module DC side of composition high frequency reduction part formation DC port in parallel successively, is connected with N winding of intermediate frequency transformer low pressure side respectively by intermediate frequency transformer side line.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310592167.7A CN103825515A (en) | 2013-11-22 | 2013-11-22 | Self-shunt excitation system based on converter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310592167.7A CN103825515A (en) | 2013-11-22 | 2013-11-22 | Self-shunt excitation system based on converter |
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| CN103825515A true CN103825515A (en) | 2014-05-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108310779A (en) * | 2018-01-30 | 2018-07-24 | 平湖市巨龙儿童用品厂 | A kind of children's Vehicular drive system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08116699A (en) * | 1994-10-14 | 1996-05-07 | Nippondenso Co Ltd | Electric power generator for vehicle |
| US5966299A (en) * | 1996-11-11 | 1999-10-12 | Korea Electric Power Corporation | Boost and buck chopper type potential source excitation system for synchronous type electric power generator |
| 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 |
| CN203537293U (en) * | 2013-11-22 | 2014-04-09 | 南方电网科学研究院有限责任公司 | Self-parallel excitation system based on three single-phase H-bridge converters |
-
2013
- 2013-11-22 CN CN201310592167.7A patent/CN103825515A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08116699A (en) * | 1994-10-14 | 1996-05-07 | Nippondenso Co Ltd | Electric power generator for vehicle |
| US5966299A (en) * | 1996-11-11 | 1999-10-12 | Korea Electric Power Corporation | Boost and buck chopper type potential source excitation system for synchronous type electric power generator |
| 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 |
| CN203537293U (en) * | 2013-11-22 | 2014-04-09 | 南方电网科学研究院有限责任公司 | Self-parallel excitation system based on three single-phase H-bridge converters |
Non-Patent Citations (1)
| Title |
|---|
| 王丹 等.: "自平衡电子电力变压器", 《中国电机工程学报》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108310779A (en) * | 2018-01-30 | 2018-07-24 | 平湖市巨龙儿童用品厂 | A kind of children's Vehicular drive system |
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Application publication date: 20140528 |
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