CN201388181Y - Self-excitation system based on parallel-connected multiple voltage-type current transformer - Google Patents
Self-excitation system based on parallel-connected multiple voltage-type current transformer Download PDFInfo
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- CN201388181Y CN201388181Y CN200920084644U CN200920084644U CN201388181Y CN 201388181 Y CN201388181 Y CN 201388181Y CN 200920084644 U CN200920084644 U CN 200920084644U CN 200920084644 U CN200920084644 U CN 200920084644U CN 201388181 Y CN201388181 Y CN 201388181Y
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Abstract
The utility model provides a self-excitation system based on a parallel-connected multiple voltage-type current transformer, which comprises an excitation transformer, M voltage-type current transformers, a chopper parallel-connected group and an excitation coil, wherein the number of a primary winding of the excitation transformer is 1, the number of secondary windings thereof is M, and M is larger than or equal to 1; and the alternating current ends of the M voltage-type current transformers are connected with the M secondary windings of the excitation transformer in one-to-one correspondence, the direct current ends are connected in parallel together so as to form a direct current port which is connected with one port of the chopper parallel-connected group, the other end of the chopper parallel-connected group is connected with the excitation coil, and the voltage-type current transformer is formed by parallel connection of at least one voltage-type three-phase fully-controlled bridge-type circuit. The self-excitation system can provide system damp not only through direct current excitation but also by adjusting the terminal voltage of a synchronous electric generator, thus effectively inhibiting the low-frequency and ultra-low frequency oscillation of power systems and improving the running stability of power systems.
Description
Technical field
The utility model relates to the exciter control system field, particularly relates 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.
The utility model content
The purpose of this utility model 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 utlity model has following technique effect:
(1) the utility model 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 utility model 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 utility model 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 utility model and field suppression switch coordination help nonlinear resistance and build pressure, effectively prevents the demagnetization failure.
Description of drawings
Fig. 1 is the utility model structural representation.
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 utility model.
Embodiment
Below in conjunction with accompanying drawing and example the utility model is described in further detail.
Structural representation as a kind of execution mode of Fig. 1 the utility model.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 kind of execution mode structural representation of the utility model, is with Fig. 1 example difference, no longer includes independently chopper and joint group 4, with each voltage-type three-phase thyristor bridge circuit 3 with after chopper 5 connect, parallel connection again, formation 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, 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.
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, 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920084644U CN201388181Y (en) | 2009-04-01 | 2009-04-01 | Self-excitation system based on parallel-connected multiple voltage-type current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920084644U CN201388181Y (en) | 2009-04-01 | 2009-04-01 | Self-excitation system based on parallel-connected multiple voltage-type current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201388181Y true CN201388181Y (en) | 2010-01-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200920084644U Expired - Lifetime CN201388181Y (en) | 2009-04-01 | 2009-04-01 | Self-excitation system based on parallel-connected multiple voltage-type current transformer |
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| Country | Link |
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| CN (1) | CN201388181Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101521446B (en) * | 2009-04-01 | 2011-04-20 | 华中科技大学 | Self-shunt excitation system based on parallel-connection multiple-voltage type convertor |
-
2009
- 2009-04-01 CN CN200920084644U patent/CN201388181Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101521446B (en) * | 2009-04-01 | 2011-04-20 | 华中科技大学 | Self-shunt excitation system based on parallel-connection multiple-voltage type convertor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20100120 Effective date of abandoning: 20090401 |