CN101667801B - Excitation system of generator - Google Patents
Excitation system of generator Download PDFInfo
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- CN101667801B CN101667801B CN2009102722711A CN200910272271A CN101667801B CN 101667801 B CN101667801 B CN 101667801B CN 2009102722711 A CN2009102722711 A CN 2009102722711A CN 200910272271 A CN200910272271 A CN 200910272271A CN 101667801 B CN101667801 B CN 101667801B
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- rectifier bridge
- controllable silicon
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Abstract
An excitation system of a generator comprises an excitation device, an excitation winding, an excitation transformer, a rectifier bridge which is connected with the secondary edge of the excitation transformer, an excitation regulator and a silicon-controlled trigger circuit; the rectifier bridge comprises a silicon-controlled rectifier and diodes; one bridge arm of the rectifier bridge is connected with two diodes and the other bridge arms are connected with the silicon-controlled rectifier; and the output end of the rectifier bridge is connected with the excitation winding of the generator. The excitation system of the generator replaces two silicon-controlled rectifiers on one bridge arm of the rectifier bridge in the traditional excitation system with dioxides, therefore, not only the controllability and the output value of the rectifier bridge are not influenced on the condition of rectification when in normal work, but also can the dioxides form a loop with the excitation winding so as to achieve the de-excitation function when de-excitation is required, thereby eliminating the de-excitation device in the traditional excitation system, simplifying the system loop, and improving the reliability of the excitation system.
Description
Technical field
The present invention relates to the generator excitation technology, a kind of specifically generator excited system that is applicable to small generator.
Background technology
Domestic generator adopts the static excitation mode more at present.Traditional static excitation system is by excitation transformer, field regulator, and controllable silicon rectifying bridge, field suppression equipment, measurement mechanism etc. are partly formed, and each part role in excitation system is different.Wherein the effect of field suppression equipment is when generator needs demagnetization for some reason, can consume the energy in the generator amature fast, reaches the purpose of demagnetization.
Field suppression equipment mainly is made up of field suppression switch and de-excitation resistance, wherein field suppression switch has multiple model, de-excitation resistance has several modes such as nonlinear resistance and linear resistance, but principle is the same, all be to utilize field suppression switch that rectifier bridge is separated, allow excitation winding and de-excitation resistance form the purpose that the loop reaches demagnetization.
For the small power generation unit, because excitation system is complicated, and the field suppression switch mechanical part bring inconvenience therefore can for unit operation and maintenance because wearing and tearing can be lost efficacy, small hydropower station particularly, and operation and attendant's knowledge are common not high.Therefore, operation of simplification excitation system and minimizing maintenance work difficulty have realistic meaning.
Summary of the invention
Purpose of the present invention is exactly in order to overcome above-mentioned the deficiencies in the prior art part, and provide a kind of generator excited system, this excitation system need not field suppression switch and de-excitation resistance, carry out the nature demagnetization by generator self, system is succinct, the possibility that there was a mechanical failure when having reduced demagnetization has improved the reliability of excitation system.Owing to carry out the nature demagnetization by generator self, so the present invention is applicable to below the 1000KW that exciting current is less than the static excitation system of 300A.
The objective of the invention is to realize by following technical measures: generator excited system comprises excitation unit, the excitation winding that links to each other with the excitation unit output, the excitation transformer that is connected with generator outlet, the rectifier bridge that is connected with the excitation transformer secondary, the field regulator that links to each other with the generator measurement device, the thyristor gating circuit that links to each other with the output of field regulator; Described rectifier bridge comprises controllable silicon and diode, is connected with two diodes on one of them brachium pontis of rectifier bridge, is connected with controllable silicon on all the other brachium pontis, and the output of rectifier bridge links to each other with the generator excitation winding; When this generator excited system operate as normal, described rectifier bridge provides a direct current to supply with excitation winding; When this generator excited system needs demagnetization, close thyristor gating circuit, controllable silicon does not receive trigger impulse and is in off state, and the electric current in the excitation winding forms the loop through diode at this moment, realizes the nature demagnetization.
In technique scheme, described rectifier bridge is by two diodes and four three phase rectifier full-bridges that controllable silicon is formed, and two diodes connect into a brachium pontis, and four controllable silicons connect into two other brachium pontis for two one group.
In technique scheme, described rectifier bridge is by three diodes and three three phase rectifier full-bridges that controllable silicon is formed, two diodes connect into a brachium pontis, and two controllable silicons connect into another brachium pontis, and a diode and a controllable silicon connect into the 3rd brachium pontis.
In technique scheme, described rectifier bridge is by two diodes and two single-phase rectification bridges that controllable silicon is formed, and two diodes connect into a brachium pontis, and two controllable silicons connect into another brachium pontis.
Compare with traditional excitation system, the present invention replaces with diode with two controllable silicons on brachium pontis of rectifier bridge in the excitation system, when the operate as normal rectification, neither can influence the controllability and the output valve of rectifier bridge like this, diode also can form the loop with excitation winding when the needs demagnetization, realize the function of demagnetization, thereby saved the field suppression equipment in traditional excitation system, simplified system circuit, improved the reliability of excitation system.The present invention compared with prior art has the following advantages:
(1) saved field suppression equipment, comprised field suppression switch and de-excitation resistance, its system configuration is more simple, uses more convenient.
(2) eliminated excitation system and caused the hidden danger of system's demagnetization fault because of field suppression switch mechanical part wear out failure, the reliability of excitation system improves greatly.
(3) the generator startup-shutdown is more convenient, and the excitation system maintenance workload reduces greatly.
Description of drawings
Fig. 1 is traditional static excitation system circuit theory diagrams.
Fig. 2 is a field suppression equipment circuit connection diagram in the traditional static excitation system.
Fig. 3 is the circuit connection diagram of generator excited system embodiment one of the present invention.
Fig. 4 is the circuit connection diagram of the embodiment of the invention two rectifier bridges.
Fig. 5 is the circuit connection diagram of the embodiment of the invention three rectifier bridges.
Embodiment
The invention will be further described below in conjunction with accompanying drawing.
Be illustrated in figure 1 as traditional static excitation system, it comprises excitation transformer, field regulator, and controllable silicon rectifying bridge, field suppression equipment, measurement mechanism, thyristor gating circuit, excitation winding FLQ etc., wherein silicon controlled rectifier all is made up of controllable silicon.
Be illustrated in figure 2 as the field suppression equipment circuit connection diagram in traditional static excitation system.Its traditional demagnetization mode is cut-off switch K1, and rectifier bridge and excitation winding FLQ are separated, and makes excitation winding FLQ and de-excitation resistance Rm ' form the loop, reaches the purpose of demagnetization.
The present invention then provides a kind of new generator static excitation system technical scheme, as shown in Figure 3, generator excited system, comprise excitation unit, the excitation winding FLQ that links to each other with the excitation unit output, the excitation transformer that is connected with generator outlet, the rectifier bridge that is connected with the excitation transformer secondary, the field regulator that is connected with the generator measurement device, the thyristor gating circuit that links to each other with the field regulator output; Described rectifier bridge is made up of controllable silicon S1, controllable silicon S2, controllable silicon S3, controllable silicon S4 and diode D1, diode D2, diode D1 and diode D2 are positioned at same brachium pontis, and the negative electrode of diode D2 links to each other with the anode of diode D1, controllable silicon S1, controllable silicon S2 and controllable silicon S3, controllable silicon S4 form other two arms of three-phase commutation bridge, and the output of rectifier bridge links to each other with generator excitation winding FLQ.
As shown in Figure 4, rectifier bridge in the technique scheme also can be by three diodes and three three phase rectifier full-bridges that controllable silicon is formed, diode D1a, diode D2a connect into a brachium pontis, controllable silicon S1a, controllable silicon S2a connect into another brachium pontis, and diode D3a, controllable silicon S3a connect into the 3rd brachium pontis.
As shown in Figure 5, the rectifier bridge in the technique scheme also can be by two diodes and two single-phase rectification bridges that controllable silicon is formed, and diode D1b, diode D2b connect into a brachium pontis, and controllable silicon S1b, controllable silicon S2b connect into another brachium pontis.
Compare with traditional excitation system, the present invention replaces with diode with two controllable silicons on brachium pontis of rectifier bridge in the excitation system, when the operate as normal rectification, neither can influence the controllability and the output valve of rectifier bridge like this, diode also can form the loop with excitation winding when the needs demagnetization, realize the function of demagnetization, thereby saved the field suppression equipment in traditional excitation system, simplified system circuit, improved the reliability of excitation system.
The operation principle of motor excitation of the present invention system is: when the excitation system operate as normal, above rectifier bridge is the same with fully controlled bridge, provides a direct current to supply with excitation winding FLQ.When excitation system needs demagnetization, close thyristor gating circuit, controllable silicon does not receive trigger impulse and belongs to off state, and then the electric current among the excitation winding FLQ is through diode D2, and diode D1 forms the loop, reaches the effect of nature demagnetization.
For the single-phase rectifier bridge circuit, when operate as normal, only need two controllable silicons of control just can make excitation winding FLQ obtain a direct current, when the needs demagnetization, then turn-off two thyristor gating circuits, exciting current is through diode D1b, diode D2b forms the loop, reaches the purpose of nature demagnetization.
Claims (1)
1. generator excited system, it is characterized in that: this generator excited system comprises excitation unit, the excitation winding that links to each other with the excitation unit output, the excitation transformer that is connected with generator outlet, the rectifier bridge that is connected with the excitation transformer secondary, the field regulator that links to each other with the generator measurement device, the thyristor gating circuit that links to each other with the output of field regulator; Described rectifier bridge is by two diodes and four three phase rectifier full-bridges that controllable silicon is formed, and two diodes connect into a brachium pontis, and four controllable silicons connect into two other brachium pontis for two one group, and the output of rectifier bridge links to each other with the generator excitation winding; When this generator excited system operate as normal, described rectifier bridge provides a direct current to supply with excitation winding; When this generator excited system needs demagnetization, close thyristor gating circuit, controllable silicon does not receive trigger impulse and is in off state, and the electric current in the excitation winding forms the loop through diode at this moment, realizes the nature demagnetization.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102722711A CN101667801B (en) | 2009-09-28 | 2009-09-28 | Excitation system of generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102722711A CN101667801B (en) | 2009-09-28 | 2009-09-28 | Excitation system of generator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101667801A CN101667801A (en) | 2010-03-10 |
| CN101667801B true CN101667801B (en) | 2011-10-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009102722711A Expired - Fee Related CN101667801B (en) | 2009-09-28 | 2009-09-28 | Excitation system of generator |
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| Country | Link |
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| CN (1) | CN101667801B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102315810B (en) * | 2011-09-08 | 2014-01-15 | 上海交通大学 | Integrated gate commutated thyristor based high-power pumped storage unit starting system |
| 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 |
| CN102522938A (en) * | 2011-12-14 | 2012-06-27 | 上海信元瑞电气有限公司 | Generator excitation control system for dynamic simulation experiments |
| CN103001565A (en) * | 2012-12-17 | 2013-03-27 | 辽宁省电力有限公司电力科学研究院 | Pure-rectification self-shunt excitation device |
| CN105763113B (en) * | 2016-04-01 | 2018-07-17 | 钛能科技股份有限公司 | A kind of low pressure Hydropower Unit exempts from excitation dual power supply adjustment of field excitation circuit |
| EP3393036A1 (en) * | 2017-04-20 | 2018-10-24 | ABB Schweiz AG | Power generation systemtechnical field |
| CN109039183A (en) * | 2018-08-17 | 2018-12-18 | 无锡道尔奇拜恩电机有限公司 | Generator excitation unit |
| CN110061664A (en) * | 2019-03-19 | 2019-07-26 | 南京国电南自维美德自动化有限公司 | A kind of synchronization signal phase-lacking fault-tolerant processing method and system |
| CN112165222A (en) * | 2020-11-06 | 2021-01-01 | 武汉科大电控设备有限公司 | Control device based on excitation system of Internet of things |
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2009
- 2009-09-28 CN CN2009102722711A patent/CN101667801B/en not_active Expired - Fee Related
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| CN101667801A (en) | 2010-03-10 |
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Granted publication date: 20111005 Termination date: 20190928 |