CN101521446B - Self-shunt excitation system based on parallel-connection multiple-voltage type convertor - Google Patents
Self-shunt excitation system based on parallel-connection multiple-voltage type convertor Download PDFInfo
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- CN101521446B CN101521446B CN200910061371XA CN200910061371A CN101521446B CN 101521446 B CN101521446 B CN 101521446B CN 200910061371X A CN200910061371X A CN 200910061371XA CN 200910061371 A CN200910061371 A CN 200910061371A CN 101521446 B CN101521446 B CN 101521446B
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Abstract
The invention provides a self-shunt excitation system based on a parallel-connection multiple-voltage type convertor, which comprises an exciting transformer, M voltage type convertors, a chopper parallel component and an exciting coil, wherein the number of the primary winding of the exciting transformer is one, the number of the secondary windings of the exciting transformer is M, and the M is more than or equal to 1; and the alternating-current terminals of the M voltage type convertors are connected with the M secondary windings of the exciting transformer in a one-to-one correspondence way, and the direct-current terminals of the M voltage type convertors are connected in parallel to form direct-current ports connected with one port of the chopper parallel component, the exciting coilis connected at the other port of the chopper parallel component, and each voltage type convertor is formed by at least one voltage type three-phase fully-controlled bridge circuit in a parallel conn ection way. The invention not only can provide damping for the system through a direct-current exciter, but also can provide damping by regulating the terminal voltage of the synchronous generator, thereby effectively inhibiting the low/ultralow frequency oscillation of the electric power system and enhancing the running stability of the electric power system.
Description
Technical field
The present invention relates to the exciter control system field, particularly relate to a kind of shunt self excitation control system based on the voltage-type current transformer.
Background technology
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 only strengthens damping by the control DC excitation, has been difficult to reach the purpose of inhibition low side 0.1Hz to the wide region low-frequency oscillation of high-end 3Hz.When electrical network generation low frequency/ultra-low frequency oscillation, the synchronous generator set end voltage also will be along with low frequency/ultra-low frequency oscillation significantly, and set end voltage might continue to be in reduced levels the long period (a few second) like this.In the duration of oscillation, fault maybe needs to augment idle if system is short-circuited, and then requires the self-shunt excitation system forced exciting or strengthens excitation.In case the excitation scarce capacity occurs, will cause the systematic failures extension.
Summary of the invention
The objective of the invention is to overcome above-mentioned weak point, a kind of shunt self excitation control system based on the voltage-type current transformer is provided, this system not only can provide damping for system by DC excitation, also the set end voltage of scalable synchronous generator provides damping for system, thereby effectively suppress electric power system low frequency/ultra-low frequency oscillation, improve power system operation stability.
Based on the self-shunt excitation system of parallel-connection multiple-voltage type convertor, comprise excitation transformer, a M voltage-type current transformer, chopper and joint group and magnet exciting coil, a number of windings of excitation transformer is 1, the secondary winding number is M, M 〉=1; M secondary winding of the interchange end of M voltage-type current transformer and excitation transformer connects one to one, and the dc terminal port that constitutes DC port and chopper and joint group that is connected in parallel joins the another port connection magnet exciting coil of chopper and joint group; Described voltage-type current transformer is made of at least one voltage-type three-phase thyristor bridge circuit parallel connection.
Based on the self-shunt excitation system of parallel-connection multiple-voltage type convertor, comprise excitation transformer, a M voltage-type current transformer, magnet exciting coil, a number of windings of excitation transformer is 1, the secondary winding number is M, M 〉=1; M secondary winding of the interchange end of M voltage-type current transformer and excitation transformer connects one to one, dc terminal is connected in parallel and constitutes DC port and magnet exciting coil joins, the voltage-type current transformer is made of at least one current transforming unit parallel connection, and current transforming unit is connected in series with chopper by voltage-type three-phase thyristor bridge circuit and constitutes.
The present invention has following technique effect:
(1) the present invention is in application, and a winding of excitation transformer is connected with the machine end of synchronous generator, and secondary winding links to each other with the AC side of parallel-connection multiple-voltage type convertor; The DC side of parallel-connection multiple-voltage type convertor links to each other with magnet exciting coil.Adopt optimal exciting to coordinate the operating state that control algolithm is controlled the full control switching device (as: IGBT, IGCT and GTO etc.) of parallel-connection multiple-voltage type convertor, to reach following two purposes: the first, electric current (the being the DC excitation electric current) size of control current transformer DC side provides positive damping for system; The second, the electric current of control AC side of converter sends or absorbing reactive power (system of being provides positive damping) through the machine end of excitation transformer to synchronous generator.By contrast, the latter directly acts on the machine end of generator, does not have time-delay (ms level) substantially, suppresses electric power system low frequency/ultra-low frequency oscillation so have faster control rate than the former.
(2) in electric power system significantly during low frequency/ultra-low frequency oscillation, the self-shunt excitation system that is made of parallel-connection multiple-voltage type convertor has boost capability, can keep good excitation ability.So can reach the control effect of separate excitation excitation system based on the novel self-shunt excitation system of parallel-connection multiple-voltage type convertor.
(3) voltage-type current transformer of the present invention adopts full control switching device conversion electric current, and the switching frequency of controlling switching device entirely is higher, and therefore the harmonic wave that produces is less relatively, parallel-connection multiple structure in addition, and the harmonic wave of generation further reduces.
Commutation failure appears in (4) traditional SCR rectification excitation system easily, and the present invention adopts the voltage-type current transformer that constitutes based on full control switching device, can not occur the commutation failure phenomenon when inversion, has improved the reliability of system.
(5) the full control switching device in the control voltage-type current transformer can turn-off direct current, so the present invention and field suppression switch coordination help nonlinear resistance and build pressure, effectively prevents the demagnetization failure.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is the excitation transformer structural representation.
Fig. 3 is a voltage-type three-phase bridge circuit structural representation.
Fig. 4 is chopper and joint group structural representation.
Fig. 5 is the excitation coil structure schematic diagram.
Fig. 6 is an another kind of structural representation of the present invention.
Embodiment
The present invention is further detailed explanation below in conjunction with accompanying drawing and example.
Structural representation as Fig. 1 one embodiment of the present invention.This system comprises excitation transformer 1 (as shown in Figure 2), a M voltage-type current transformer 2, chopper and joint group 4 and magnet exciting coil 6 (as shown in Figure 5); A number of windings of excitation transformer 1 is 1, and the secondary winding number is M, M 〉=1; A winding a of excitation transformer 1 is connected with the machine end of synchronous generator; M secondary winding b of the interchange port c of M voltage-type current transformer 2 and excitation transformer 1 connects one to one; The DC port of M voltage-type current transformer 2 is connected in parallel, and constitutes DC port d, links to each other with a port e of chopper and joint group 4; Another port f of chopper and joint group 4 is connected with the input port g of magnet exciting coil 6.
N the voltage-type three-phase thyristor bridge circuit 3 (as shown in Figure 3) based on full control device is connected in parallel, and forms voltage-type current transformer 2, N 〉=1; P chopper 5 (as shown in Figure 4) is connected in parallel, and forms chopper and joint group 4, P 〉=1.
Fig. 6 is the another embodiment of the present invention structural representation, is with Fig. 1 example difference, no longer includes independently chopper and joint group 4, and each voltage-type three-phase thyristor bridge circuit 3 is with after chopper 5 is connected, in parallel again, constitutes voltage-type current transformer 2.
Claims (2)
1. based on the self-shunt excitation system of parallel-connection multiple-voltage type convertor, comprise excitation transformer, a M voltage-type current transformer, chopper and joint group and magnet exciting coil, a number of windings of excitation transformer is 1, and the secondary winding number is M, M〉1; M secondary winding of the interchange end of M voltage-type current transformer and excitation transformer connects one to one, and the dc terminal port that constitutes DC port and chopper and joint group that is connected in parallel joins the another port connection magnet exciting coil of chopper and joint group; Described voltage-type current transformer constitutes N by the parallel connection of N voltage-type three-phase thyristor bridge circuit〉1.
2. based on the self-shunt excitation system of parallel-connection multiple-voltage type convertor, comprise excitation transformer, a M voltage-type current transformer, magnet exciting coil, a number of windings of excitation transformer is 1, and the secondary winding number is M, M〉1; M secondary winding of the interchange end of M voltage-type current transformer and excitation transformer connects one to one, dc terminal is connected in parallel and constitutes DC port and magnet exciting coil joins, the voltage-type current transformer is made of N current transforming unit parallel connection, N〉1, current transforming unit is connected in series with chopper by voltage-type three-phase thyristor bridge circuit and constitutes.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910061371XA CN101521446B (en) | 2009-04-01 | 2009-04-01 | Self-shunt excitation system based on parallel-connection multiple-voltage type convertor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910061371XA CN101521446B (en) | 2009-04-01 | 2009-04-01 | Self-shunt excitation system based on parallel-connection multiple-voltage type convertor |
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| Publication Number | Publication Date |
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| CN101521446A CN101521446A (en) | 2009-09-02 |
| CN101521446B true CN101521446B (en) | 2011-04-20 |
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| CN200910061371XA Active CN101521446B (en) | 2009-04-01 | 2009-04-01 | Self-shunt excitation system based on parallel-connection multiple-voltage type convertor |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103281024B (en) * | 2013-04-22 | 2016-06-08 | 广东电网公司电力科学研究院 | A kind of AC excitation system based on full-controlled device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2788448Y (en) * | 2005-04-19 | 2006-06-14 | 华中科技大学 | Asynchronous-to-synchronous generator excitation device |
| CN201388181Y (en) * | 2009-04-01 | 2010-01-20 | 华中科技大学 | Self-excitation system based on parallel-connected multiple voltage-type current transformer |
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2009
- 2009-04-01 CN CN200910061371XA patent/CN101521446B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2788448Y (en) * | 2005-04-19 | 2006-06-14 | 华中科技大学 | Asynchronous-to-synchronous generator excitation device |
| CN201388181Y (en) * | 2009-04-01 | 2010-01-20 | 华中科技大学 | Self-excitation system based on parallel-connected multiple voltage-type current transformer |
Non-Patent Citations (1)
| Title |
|---|
| 吴建东等.同步发电机的新型励磁系统.《电力科学与技术学报》.2009,第24卷(第1期),12-18. * |
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