CN102412777B - Self shunt excitation control system of series structure of three current-mode single-phase bridge-type convertors - Google Patents
Self shunt excitation control system of series structure of three current-mode single-phase bridge-type convertors Download PDFInfo
- Publication number
- CN102412777B CN102412777B CN201110396579.4A CN201110396579A CN102412777B CN 102412777 B CN102412777 B CN 102412777B CN 201110396579 A CN201110396579 A CN 201110396579A CN 102412777 B CN102412777 B CN 102412777B
- Authority
- CN
- China
- Prior art keywords
- current
- excitation
- phase bridge
- transformer
- control system
- 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.)
- Active
Links
Abstract
The invention provides a self shunt excitation control system of a series structure of three current-mode single-phase bridge-type convertors. The system comprises an exciting transformer, a current-mode converter and an excitation coil, wherein the current-mode converter is formed by series connection of three current-mode single-phase bridge circuits based on a fully controlled switching device; and the alternating current side of the current-mode converter is respectively connected with a secondary winding of the exciting transformer in the manner of one-to-one correspondence, and the direct current side of the current-mode converter is connected with the input end of the excitation coil. The self shunt excitation control system can provide positive damping for a system through direct current excitation, and can also provide positive damping for the system by regulating the terminal voltage of a synchronous generator, thereby more effectively restraining low frequency/ultra low frequency oscillation of the electric power system, and improving the operational stability of the electric power system.
Description
Technical field
The present invention relates to exciter control system field, especially relate to a kind of Self-shunt-excitation excitation control system of current mode three single-phase bridge current transformer cascaded structures.
Background technology
Safe and stable operation and the national economy of electric power system are closely related.Wherein, excitation control has become one of important means improving power system stability operation, and good excitation system can effectively ensure quality of voltage, improves power system operation stability.Along with the development of net capacity and scale, the reliability to excitation control and dynamic property require also more and more higher, and synchronous generator becomes the major way of domestic and international excitation control with its unique advantage from shunt excitation system.
Modern power systems requires synchronous generator excited system can suppress 0.1Hz～3Hz low frequency/ultra-low frequency oscillation.But the excitation system of conventional silicon controlled rectifier only strengthens damping by controlling DC excitation, be difficult to reach the object of inhibition low side 0.1Hz to the wide region low-frequency oscillation of high-end 3Hz.In the time of electrical network generation low frequency/ultra-low frequency oscillation, synchronous generator set end voltage also will be along with low frequency/ultra-low frequency oscillation significantly, and likely the long period (a few second) continues to be in reduced levels to set end voltage like this.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, will cause systematic failures extension.
Summary of the invention
The object of the invention is to overcome above-mentioned weak point, a kind of Self-shunt-excitation excitation control system of current mode three single-phase bridge current transformer cascaded structures is provided, this system not only can provide damping for system by DC excitation, also the set end voltage of adjustable synchronous generator provides damping for system, thereby effectively suppress electric power system low frequency/ultra-low frequency oscillation, improve power system operation stability.
The Self-shunt-excitation excitation control system of a kind of current mode three single-phase bridge current transformer cascaded structures provided by the invention, is characterized in that, this system comprises excitation transformer, current source converter and magnet exciting coil; Current source converter by three the current mode single-phase bridge circuit based on full control switching device in series; The AC of current source converter connects one to one with the secondary winding of excitation transformer respectively, and DC side is connected with the input of magnet exciting coil.
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 is connected with the AC of current source converter; The DC side of current source converter is connected with magnet exciting coil.By controlling the operating state of full control switching device of current source converter, to reach two objects: the first, electric current (the being DC excitation electric current) size of controlling current transformer DC side provides positive damping for system; The second, the electric current of controlling AC side of converter sends or absorbing reactive power (system of being provides positive damping) to the machine end of synchronous generator through excitation transformer.By contrast, the latter directly acts on the machine end of generator, substantially, without time delay (ms level), suppresses electric power system low frequency/ultra-low frequency oscillation so have faster control rate than the former.
(2) may there is commutation failure in traditional SCR rectification excitation system, and the present invention adopts the current source converter forming based on full control switching device, there will not be commutation failure phenomenon in the time of inversion, has improved the reliability of system.
(3) features such as current transformer of the present invention adopts current mode three single-phase bridge current transformer cascaded structure forms, has control mode simple, and alternating current-direct current harmonic wave is relatively little, and control rate is faster.In addition, by controlling the on off state of each single-phase converter DC side switch, can make each single-phase converter for subsequent use each other, thereby further improve the reliability of system.
(4) the full control switching device of controlling in current source converter can turn-off direct current, therefore the present invention and field suppression switch coordination are conducive to nonlinear resistance and build pressure, effectively prevents demagnetization failure.
Brief description of the drawings
Fig. 1 is structural representation 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, system provided by the invention comprises excitation transformer 1, current source converter 2 and magnet exciting coil 4; Current source converter 2 is in series by three single-phase full-controlled bridge circuit 3 of the current mode based on full control switching device, and 3, circuit is made up of a single-phase full bridge rectification circuit and its DC side parallel switching circuit; The AC c of current source converter 2 connects one to one with the secondary winding b of excitation transformer 1 respectively, and DC side d is connected with the input e of magnet exciting coil.The output of magnet exciting coil is used for setting up stationary magnetic field, produces induced electromotive force in the time that synchronous generator rotor rotates in stator, and a winding of excitation transformer 1 is for being connected with the machine end of synchronous generator.Full control switching device can be insulated gate bipolar translator power tube IGBT, integrated gate commutated thyristor IGCT and turn-off thyristor GTO etc.
The above is preferred embodiment of the present invention, but the present invention should not be confined to the disclosed content of this embodiment and accompanying drawing.Do not depart from the equivalence or the amendment that under spirit disclosed in this invention, complete so every, all fall into the scope of protection of the invention.
Claims (1)
1. a Self-shunt-excitation excitation control system for current mode three single-phase bridge current transformer cascaded structures, is characterized in that, this system comprises excitation transformer, current source converter and magnet exciting coil; The former side of excitation transformer is three phase windings, and pair side is three single-phase windings independently; Current source converter by three the current mode single-phase bridge circuit based on full control switching device in series, this current mode single-phase bridge circuit is made up of a single-phase full bridge rectification circuit and its DC side parallel switching circuit, control the on off state of the DC side switch of each single-phase bridge current transformer, can make each single-phase bridge current transformer for subsequent use each other; The AC of current source converter connects one to one with the secondary winding of excitation transformer respectively, and DC side is connected with the input of magnet exciting coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110396579.4A CN102412777B (en) | 2011-12-02 | 2011-12-02 | Self shunt excitation control system of series structure of three current-mode single-phase bridge-type convertors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110396579.4A CN102412777B (en) | 2011-12-02 | 2011-12-02 | Self shunt excitation control system of series structure of three current-mode single-phase bridge-type convertors |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102412777A CN102412777A (en) | 2012-04-11 |
| CN102412777B true CN102412777B (en) | 2014-08-27 |
Family
ID=45914679
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110396579.4A Active CN102412777B (en) | 2011-12-02 | 2011-12-02 | Self shunt excitation control system of series structure of three current-mode single-phase bridge-type convertors |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102412777B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| US11394278B2 (en) | 2018-12-29 | 2022-07-19 | University Of Shanghai For Science And Technology | Shunt wound DC motor driving device and electrical equipment |
| CN113783201B (en) * | 2021-08-23 | 2023-05-09 | 国网浙江省电力有限公司电力科学研究院 | Power generation system based on three-channel full-control excitation device and control method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101593982A (en) * | 2009-04-01 | 2009-12-02 | 华中科技大学 | Self-shunt excitation system based on parallel multiple current source converters |
| CN101610063A (en) * | 2009-06-24 | 2009-12-23 | 北京利德华福电气技术有限公司 | A kind of high voltage converter and control method thereof of utilizing inverter carrying out soft excitation |
| CN101667801A (en) * | 2009-09-28 | 2010-03-10 | 武汉武大电力科技有限公司 | Excitation system of generator |
| EP2293432A1 (en) * | 2009-09-07 | 2011-03-09 | Alstom Technology Ltd | Static exciter of an electric generator, method for retrofitting and method for operating the same |
| CN202334426U (en) * | 2011-12-02 | 2012-07-11 | 华中科技大学 | Self-shunt-excitation excitation control system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102231588A (en) * | 2011-06-16 | 2011-11-02 | 南京航空航天大学 | Capacitance compensation circuit structure applied to doubly salient DC generator |
-
2011
- 2011-12-02 CN CN201110396579.4A patent/CN102412777B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101593982A (en) * | 2009-04-01 | 2009-12-02 | 华中科技大学 | Self-shunt excitation system based on parallel multiple current source converters |
| CN101610063A (en) * | 2009-06-24 | 2009-12-23 | 北京利德华福电气技术有限公司 | A kind of high voltage converter and control method thereof of utilizing inverter carrying out soft excitation |
| EP2293432A1 (en) * | 2009-09-07 | 2011-03-09 | Alstom Technology Ltd | Static exciter of an electric generator, method for retrofitting and method for operating the same |
| CN101667801A (en) * | 2009-09-28 | 2010-03-10 | 武汉武大电力科技有限公司 | Excitation system of generator |
| CN202334426U (en) * | 2011-12-02 | 2012-07-11 | 华中科技大学 | Self-shunt-excitation excitation control system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102412777A (en) | 2012-04-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Banerjee et al. | Load-commutated SCR current-source-inverter-fed induction motor drive with sinusoidal motor voltage and current | |
| CN102412777B (en) | Self shunt excitation control system of series structure of three current-mode single-phase bridge-type convertors | |
| CN104253549A (en) | LCL filtering-based circuit topology structure of high-power PWM (pulse-width modulation) rectifier | |
| CN204190636U (en) | PWM rectifier circuit topological structure | |
| CN103281024B (en) | A kind of AC excitation system based on full-controlled device | |
| CN202334426U (en) | Self-shunt-excitation excitation control system | |
| Wijaya et al. | Reducing induction motor starting current using magnetic energy recovery switch (MERS) | |
| CN101593982B (en) | Self and shunt excitation system based on parallel multiple current source converters | |
| CN103248302A (en) | Quick-response excitation method for controllable reactor | |
| Abu-Elhaija et al. | Self-excitation and stability at speed transients of self-excited single-phase reluctance generators | |
| Li et al. | Back-to-Back Modular Multilevel Converter Topology with DC-Link Switches for High-Power Four-Quadrant Variable Speed Motor Drives | |
| CN201374675Y (en) | Self and shunt excitation system based on parallel multiple current-type converter | |
| CN202034860U (en) | Alternating current generator | |
| CN202004660U (en) | DC (Direct Current) over-voltage control system of rectification unit uncontrolled of high-voltage transducer | |
| CN101521446B (en) | Self-shunt excitation system based on parallel-connection multiple-voltage type convertor | |
| Milan et al. | A novel SPWM strategy for single-to three-phase matrix converter | |
| CN201388181Y (en) | Self-excitation system based on parallel-connected multiple voltage-type current transformer | |
| Sharma et al. | Bi-directional TRIAC fault-protection technique for Z-source half-bridge converter-fed AC motor Drives | |
| CN202978804U (en) | Self-shunt-excited excitation system based on modular multilevel converter | |
| CN203537293U (en) | Self-parallel excitation system based on three single-phase H-bridge converters | |
| Badrzadeh | Qualitative performance assessment of semiconductor switching device, converter and generator candidates for 10 MW offshore wind turbine generators | |
| CN202150822U (en) | Four-quadrant frequency-converter main circuit used for constant-power wide range speed control of permanent magnet synchronous motor | |
| Hua et al. | A high voltage and high power adjustable speed drive system using the integrated $ LC $ and step-up transforming filter | |
| CN104270019A (en) | PWM rectifier circuit topology structure | |
| Jia et al. | Power converter topology and control strategy for novel two-phase DC-biased vernier reluctance machine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |