CN202334426U - Self-shunt-excitation excitation control system - Google Patents
Self-shunt-excitation excitation control system Download PDFInfo
- Publication number
- CN202334426U CN202334426U CN2011204972339U CN201120497233U CN202334426U CN 202334426 U CN202334426 U CN 202334426U CN 2011204972339 U CN2011204972339 U CN 2011204972339U CN 201120497233 U CN201120497233 U CN 201120497233U CN 202334426 U CN202334426 U CN 202334426U
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- excitation
- current
- transformer
- shunt
- control system
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Abstract
The utility model discloses a self-shunt-excitation excitation control system of a cascaded structure of a current type three-single-phase bridge current transformer. The self-shunt-excitation excitation control system comprises an excitation transformer, a current type current transformer and an excitation coil, wherein the current type current transformer is formed by connecting full-control-switching-device-based current type three-single-phase bridge circuits in series; and an alternating current side of the current type current transformer is connected with secondary windings of the excitation transformer in one-to-one correspondence, and the direct current side of the current type current transformer is connected with an input end of the excitation coil. According to the self-shunt-excitation excitation control system, positive damping can be provided for the system through direct current excitation and also can be provided for the system by adjusting the machine terminal voltage of a synchronous generator, so that low frequency/ultra-low frequency oscillations of an electric system can be inhibited more efficiently, and the running stability of the electric system is improved.
Description
Technical field
The utility model relates to the exciter control system field, especially relates to a kind of shunt self excitation control system of current mode three single-phase bridge current transformer cascaded structures.
Background technology
The safe and stable operation and the national economy of electric power system are closely related.Wherein, excitation control has become one of important means that improves the power system stability operation, and good excitation system can effectively guarantee quality of voltage, improves power system operation stability.Along with the development of net capacity and scale, also increasingly high to the reliability and the dynamic property requirement of excitation control, synchronous generator becomes the main mode of domestic and international excitation control with its unique advantage from the shunt excitation system.
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 through 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, idle if system's failed because maybe need be augmented, then require the self-shunt excitation system forced exciting or strengthen excitation.In case the excitation scarce capacity occurs, will cause the systematic failures extension.
Summary of the invention
The purpose of the utility model is to overcome above-mentioned weak point; A kind of shunt self excitation control system is provided; This system can be that system provides damping through DC excitation not only; Also the set end voltage of scalable synchronous generator is that system provides damping, thereby effectively suppresses electric power system low frequency/ultra-low frequency oscillation, improves power system operation stability.
A kind of shunt self excitation control system that the utility model provides is characterized in that this system comprises excitation transformer, current source converter and magnet exciting coil; Current source converter is made up of three current mode single-phase bridge circuit series connection based on full control switching device; The AC side of current source converter connects one to one with the secondary winding of excitation transformer respectively, and DC side links to each other with the input of magnet exciting coil.
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 current source converter; The DC side of current source converter links to each other with magnet exciting coil.The operating state of the full control switching device through Control current type current transformer, to reach 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) basically, suppresses electric power system low frequency/ultra-low frequency oscillation so have much fast control rate than the former.
Commutation failure may appear in (2) traditional SCR rectification excitation system, and the utility model adopts the current source converter that constitutes based on full control switching device, the commutation failure phenomenon when inversion, can not occur, has improved the reliability of system.
Characteristics such as (3) current transformer of the utility model adopts current mode three single-phase bridge current transformer cascaded structure forms, and it is simple to have control mode, and the alternating current-direct current harmonic wave is less relatively, and control rate is faster.In addition,, can make each single-phase converter subsequent use each other, thereby further improve the reliability of system through controlling the on off state of each single-phase converter DC side switch.
(4) the full control switching device in the Control current 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.
Embodiment
Below through by instance the utility model being described in further detail, but following examples only are illustrative, and the protection range of the utility model does not receive the restriction of these embodiment.
As shown in Figure 1, the system that the utility model provides comprises excitation transformer 1, current source converter 2 and magnet exciting coil 4; Current source converter 2 is made up of single-phase full-controlled bridge circuit 3 series connection of three current modes based on full control switching device, and 3 in circuit is made up of a single-phase full bridge rectification circuit and its DC side parallel switching circuit; The AC side c of current source converter 2 connects one to one with the secondary winding b of excitation transformer 1 respectively, and DC side d links to each other with the input e of magnet exciting coil.The output of magnet exciting coil is used to set up the stationary magnetic field, when synchronous generator rotor rotates, in stator, produces induced electromotive force, and a winding of excitation transformer 1 is used for being connected with the machine end of synchronous generator.Full control switching device can be insulated gate bipolar power tube IGBT, integrated gate commutated thyristor IGCT and turn-off thyristor GTO etc.
The above is the preferred embodiment of the utility model, but the utility model should not be confined to the disclosed content of this embodiment and accompanying drawing.So everyly do not break away from the equivalence of accomplishing under the spirit disclosed in the utility model or revise, all fall into the scope of the utility model protection.
Claims (2)
1. a shunt self excitation control system is characterized in that, this system comprises excitation transformer, current source converter and magnet exciting coil; Current source converter is made up of three current mode single-phase bridge circuit series connection based on full control switching device; The AC side of current source converter connects one to one with the secondary winding of excitation transformer respectively, and DC side links to each other with the input of magnet exciting coil.
2. shunt self excitation control system according to claim 1 is characterized in that, said current mode single-phase bridge circuit is made up of a single-phase full bridge rectification circuit and its DC side parallel switching circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204972339U CN202334426U (en) | 2011-12-02 | 2011-12-02 | Self-shunt-excitation excitation control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204972339U CN202334426U (en) | 2011-12-02 | 2011-12-02 | Self-shunt-excitation excitation control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202334426U true CN202334426U (en) | 2012-07-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204972339U Expired - Fee Related CN202334426U (en) | 2011-12-02 | 2011-12-02 | Self-shunt-excitation excitation control system |
Country Status (1)
| Country | Link |
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| CN (1) | CN202334426U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102412777A (en) * | 2011-12-02 | 2012-04-11 | 华中科技大学 | Self shunt excitation control system of series structure of three current-mode single-phase bridge-type convertors |
| CN103326650A (en) * | 2013-05-15 | 2013-09-25 | 华中科技大学 | Self-shunt excitation system of electric generator |
-
2011
- 2011-12-02 CN CN2011204972339U patent/CN202334426U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102412777A (en) * | 2011-12-02 | 2012-04-11 | 华中科技大学 | Self shunt excitation control system of series structure of three current-mode single-phase bridge-type convertors |
| CN102412777B (en) * | 2011-12-02 | 2014-08-27 | 华中科技大学 | Self shunt excitation control system of series structure of three current-mode single-phase bridge-type convertors |
| CN103326650A (en) * | 2013-05-15 | 2013-09-25 | 华中科技大学 | Self-shunt excitation system of electric generator |
| CN103326650B (en) * | 2013-05-15 | 2015-12-09 | 华中科技大学 | A kind of self-shunt excitation system of generator |
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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 |
Granted publication date: 20120711 Termination date: 20141202 |
|
| EXPY | Termination of patent right or utility model |