CN209787080U - Rectifying device in synchronous generator excitation system - Google Patents
Rectifying device in synchronous generator excitation system Download PDFInfo
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- CN209787080U CN209787080U CN201920319628.6U CN201920319628U CN209787080U CN 209787080 U CN209787080 U CN 209787080U CN 201920319628 U CN201920319628 U CN 201920319628U CN 209787080 U CN209787080 U CN 209787080U
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- Prior art keywords
- rectifier bridge
- synchronous generator
- transformer
- excitation
- thyristor
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- 230000005284 excitation Effects 0.000 title claims abstract description 42
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 24
- 238000004804 winding Methods 0.000 claims abstract description 16
- 239000003990 capacitor Substances 0.000 claims description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 230000003321 amplification Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
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Abstract
the utility model discloses a fairing in synchronous generator excitation system, include: the synchronous generator comprises a first rectifier bridge and a second rectifier bridge which are electrically connected, wherein the first rectifier bridge and the second rectifier bridge respectively comprise three branches, each branch is formed by connecting two unidirectional thyristors in series, each unidirectional thyristor is connected with a driving circuit for driving the thyristor to work, the middle point of each branch is respectively connected with one end of a three-stage switch through a fuse, the other end of the three-stage switch is connected with the output end of an excitation voltage regulator, and two groups of end points of each branch are respectively connected with two ends of an excitation winding of the synchronous generator. The utility model discloses simple structure, the reliability is high, makes every thyristor all work at the optimum.
Description
Technical Field
The utility model relates to an automatic control technical field especially relates to a fairing in synchronous generator excitation system.
Background
The excitation system is an important component of the generator and is used for providing adjustable excitation current for the synchronous generator so as to meet the requirements of normal power generation of the generator and safe operation of a power system. Therefore, excitation of the generator is adjusted and rectified, reliability, safety and stability of operation of the generator and the power system can be guaranteed, and technical and economic indexes of the generator and the power system can be improved.
As the capacity of the synchronous motor is increased, the exciting current is also increased. The traditional single rectifier bridge device can not meet the requirement, so that an excitation device with a plurality of rectifier bridges connected in parallel is needed. However, for most self-contained power plants and small-sized hydraulic power plants, two sets of rectifier bridges are required to operate in parallel, and because the conduction voltage drop of the silicon controlled rectifiers and the line impedance are different during parallel operation, the conduction currents of the silicon controlled rectifiers are different during parallel operation, and therefore, a current equalizing device is needed to enable the conduction currents of the silicon controlled rectifiers to be approximately the same.
SUMMERY OF THE UTILITY MODEL
the utility model provides a rectifier unit among synchronous generator excitation system, simple structure, each parallelly connected thyristor on-state average current magnitude equals in each rectifier bridge.
A rectifying device in a synchronous generator excitation system, comprising: the synchronous generator comprises a first rectifier bridge and a second rectifier bridge which are electrically connected, wherein the first rectifier bridge and the second rectifier bridge respectively comprise three branches, each branch is formed by connecting two unidirectional thyristors in series, each unidirectional thyristor is connected with a driving circuit for driving the thyristor to work, the middle point of each branch is respectively connected with one end of a three-stage switch through a fuse, the other end of the three-stage switch is connected with the output end of an excitation voltage regulator, and two groups of end points of each branch are respectively connected with two ends of an excitation winding of the synchronous generator.
Preferably, the first rectifier bridge is connected to the output terminal of the field transformer through a three-level switch YK1, the second rectifier bridge is connected to the output terminal of the field transformer through a three-level switch YK2, the first rectifier bridge is connected to the ac exciter stator winding through a switch ZK1, and the second rectifier bridge is connected to the ac exciter stator winding through a switch ZK 2.
Preferably, each unidirectional thyristor is connected with a resistance-capacitance protection circuit for preventing the generator from generating overvoltage in the rotor excitation winding.
Preferably, the input end of the driving circuit is connected with six paths of double-pulse signals output by the excitation controller, and the output end of the driving circuit is connected to the negative electrode and the G pole of the unidirectional thyristor.
Preferably, the drive circuit includes: the diode D1, the diode D3, the transformer KCB and the resistor R5, wherein the MD + terminal is connected to the 1 terminal of the transformer KCB through the diode D1, the trigger terminal MC is connected to the 5 terminal of the transformer KCB through a loop formed by the resistor R5 and the capacitor C2, the 7 terminal of the transformer KCB is connected to the G pole of the unidirectional thyristor through the diode D3, and the 9 terminal of the transformer KCB is connected to the negative pole of the unidirectional thyristor.
The utility model adopts the above structure after, circuit structure has been simplified, and its excitation voltage is more reliable and more stable in the operation process. Meanwhile, the on-state average current of each parallel thyristor in each rectifier bridge is equal.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which,
Fig. 1 is a circuit schematic of a synchronous generator excitation system according to an embodiment of the present invention;
FIG. 2 is a circuit schematic of the rectifying device of FIG. 1;
Fig. 3 is a circuit schematic of the thyristor drive circuit of fig. 2.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.
As shown in fig. 1 to 3, the utility model discloses a rectifier device for synchronous generator excitation system is located the synchronous generator excitation end outside, and wherein, the output of exciting transformer and excitation controller is connected with rectifier device's input, and rectifier device's output connection ac machine exciter stator winding, rectifier device includes: a first rectifier bridge (i.e. the # 1 rectifier bridge in fig. 2) and a second rectifier bridge (i.e. the # 2 rectifier bridge in fig. 2), wherein the first rectifier bridge is connected to the output terminal of the exciting transformer through a three-level switch YK1, the second rectifier bridge is connected to the output terminal of the exciting transformer through a three-level switch YK2, the first rectifier bridge is connected to the ac exciter stator winding through a switch ZK1, and the second rectifier bridge is connected to the ac exciter stator winding through a switch ZK 2.
The utility model discloses a rectifier circuit for synchronous generator excitation system's fairing is the three-phase full control rectifier bridge, and first rectifier bridge is the same with second rectifier bridge structure, every branch road of rectifier bridge is established ties by two unidirectional thyristor and is constituteed, and the mid point of every branch road is connected with the one end of tertiary switch via the fuse respectively, and the output of excitation voltage regulator is connected to the other end of tertiary switch, and two sets of endpoints of each branch road are connected with the both ends of synchronous generator excitation winding respectively.
Because each branch in the rectifying loop of the rectifying device is formed by connecting two unidirectional thyristors in series, when one of the two unidirectional thyristors has a fault, the other unidirectional thyristor can still work, and the normal operation of the generator is not influenced; the rectification loop is also provided with a resistance-capacitance protection circuit to prevent overvoltage generated in the rotor excitation winding due to step loss of the generator rotor or short circuit of the stator end.
As shown in fig. 2, a rectifying circuit of the rectifying device is a three-phase fully-controlled rectifying bridge, each branch of the rectifying bridge is formed by connecting two unidirectional thyristors in series, specifically, in the first rectifying bridge, unidirectional thyristor 1V1 and unidirectional thyristor 1V4 are connected in series, unidirectional thyristor 1V3 and unidirectional thyristor 1V6 are connected in series, unidirectional thyristor 1V5 and unidirectional thyristor 1V2 are connected in series, a midpoint of a branch of the series connection of unidirectional thyristor 1V1 and unidirectional thyristor 1V4 is connected with one end of fuse 1KR1, the other end of fuse 1KR1 is connected with a 701A terminal through a three-level switch YK1, a midpoint of a branch of the series connection of unidirectional thyristor 1V3 and unidirectional thyristor 1V6 is connected with one end of fuse 1KR2, and the other end of fuse 1KR2 is connected with a 701B terminal through a three-level switch YK 1; the middle point of a branch of the series connection of the unidirectional thyristor 1V5 and the unidirectional thyristor 1V2 is connected with one end of a fuse 1KR3, the other end of the fuse 1KR3 is connected with a 701C end through a three-stage switch YK1, in a second rectifier bridge, the unidirectional thyristor 2V1 is connected with the unidirectional thyristor 2V4 in series, the unidirectional thyristor 2V3 is connected with the unidirectional thyristor 2V6 in series, the unidirectional thyristor 2V5 is connected with the unidirectional thyristor 2V2 in series, the middle point of a branch of the series connection of the unidirectional thyristor 2V1 and the unidirectional thyristor 2V4 is connected with one end of a fuse 2KR1, the other end of the fuse 2KR1 is connected with a 701A end through a three-stage switch YK2, the middle point of a branch of the series connection of the unidirectional thyristor 2V3 and the unidirectional thyristor 2V6 is connected with one end of a fuse 2KR2, and the other end of; the midpoint of a branch circuit formed by serially connecting the unidirectional thyristor 2V5 and the unidirectional thyristor 2V2 is connected with one end of a fuse 2KR3, the other end of the fuse 2KR3 is connected with a 701C end through a three-stage switch YK2, and the 701A end, the 701B end and the 701C end are output ends of the excitation transformer.
Furthermore, each unidirectional thyristor is connected with a resistance-capacitance protection circuit, taking unidirectional thyristor 1V1 as an example, two ends of unidirectional thyristor 1V1 are connected with a resistor R and a capacitor C which are connected in series, and the resistor R and the capacitor C form the resistance-capacitance protection circuit, so that overvoltage is prevented from being generated in a rotor excitation winding due to step loss of a generator rotor or short circuit of a stator machine end.
Further, output ends 701A, 701B and 701C of an excitation transformer are connected with a rectifying device through switches, six paths of double pulses output by an excitation controller are connected to the rectifying device through pulse transformer isolation amplification to trigger a unidirectional thyristor in the rectifying device, six paths of double pulse signals + a, -C, + B, -a, + C and-B output by the excitation controller are respectively connected to the unidirectional thyristors in a first rectifying bridge and a second rectifying bridge, and the output end of the rectifying device is connected with a stator winding of an alternating current machine exciter.
Specifically, each of the thyristors is connected to a driving circuit for driving the thyristors to operate, for example, the thyristor 1V1 is connected to a driving circuit 1MP1, the pulse signal and MD + output by the excitation controller are input to the driving circuit, and the output end of the driving circuit is connected to the negative pole and G pole of the thyristor, in the first rectifier bridge of this embodiment, six double pulse signals + a, -C, + B, -a, + C, -B output by the excitation controller are respectively connected to the driving circuit 1MP1, the driving circuit 1MP2, the driving circuit 1MP3, the driving circuit 1MP4, the driving circuit 1MP5, the driving circuit 1MP6, and in the second rectifier bridge, six double pulse signals + a, -C, + B, -a, + C, -B, and B output by the excitation controller are respectively connected to the driving circuit 2MP1, the driving circuit 2MP2, the driving circuit 2MP3, the driving circuit 2MP4, and the driving circuit 2MP4, A drive circuit 2MP5, and a drive circuit 2MP 6.
The drive circuit in this embodiment includes: diode D1, diode D2, diode D3, transformer KCB, resistor R2, resistor R3, resistor R5 and light emitting diode LED1, wherein the MD + end is connected to the 1 end of the transformer KCB through diode D1, the trigger end MC is connected to the 5 end of the transformer KCB through a loop formed by resistor R5 and capacitor C2, the 7 end of the transformer KCB is connected to the G pole of the unidirectional thyristor through diode D3, and the 9 end of the transformer KCB is connected to the negative pole of the unidirectional thyristor.
The utility model discloses a rectifier circuit for synchronous generator excitation system's fairing is the three-phase and controls the rectifier bridge entirely, and first rectifier bridge is the same with second rectifier bridge structure, and excitation controller output pulse to the thyristor drive circuit who corresponds, first rectifier bridge thyristor on-state average current and second rectifier bridge thyristor on-state average current tend to equal, adjust the holding stability this moment.
Claims (4)
1. a rectifying device in a synchronous generator excitation system, comprising: the synchronous generator comprises a first rectifier bridge and a second rectifier bridge which are electrically connected, wherein the first rectifier bridge and the second rectifier bridge respectively comprise three branches, each branch is formed by connecting two unidirectional thyristors in series, each unidirectional thyristor is connected with a driving circuit for driving the thyristor to work, the middle point of each branch is respectively connected with one end of a three-stage switch through a fuse, the other end of the three-stage switch is connected with the output end of an excitation voltage regulator, and two groups of end points of each branch are respectively connected with two ends of an excitation winding of the synchronous generator; the drive circuit includes: the diode D1, the diode D3, the transformer KCB and the resistor R5, wherein the MD + terminal is connected to the 1 terminal of the transformer KCB through the diode D1, the trigger terminal MC is connected to the 5 terminal of the transformer KCB through a loop formed by the resistor R5 and the capacitor C2, the 7 terminal of the transformer KCB is connected to the G pole of the unidirectional thyristor through the diode D3, and the 9 terminal of the transformer KCB is connected to the negative pole of the unidirectional thyristor.
2. The rectifier device in a synchronous generator excitation system of claim 1, wherein said first rectifier bridge is connected to the output of the field transformer through a three-level switch YK1, said second rectifier bridge is connected to the output of the field transformer through a three-level switch YK2, said first rectifier bridge is connected to the ac exciter stator winding through a switch ZK1, and said second rectifier bridge is connected to the ac exciter stator winding through a switch ZK 2.
3. A rectifying unit in a field excitation system of a synchronous generator as claimed in claim 1, wherein each of said thyristors is connected to a rc protection circuit for preventing the generator from generating overvoltage in the field winding of the rotor.
4. The rectifying device in the excitation system of the synchronous generator according to claim 1, wherein the input end of the driving circuit is connected with the six double-pulse signals output by the excitation controller, and the output end of the driving circuit is connected with the negative pole and the G pole of the unidirectional thyristor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920319628.6U CN209787080U (en) | 2019-03-14 | 2019-03-14 | Rectifying device in synchronous generator excitation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920319628.6U CN209787080U (en) | 2019-03-14 | 2019-03-14 | Rectifying device in synchronous generator excitation system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209787080U true CN209787080U (en) | 2019-12-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920319628.6U Expired - Fee Related CN209787080U (en) | 2019-03-14 | 2019-03-14 | Rectifying device in synchronous generator excitation system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209787080U (en) |
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2019
- 2019-03-14 CN CN201920319628.6U patent/CN209787080U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191213 |
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| CF01 | Termination of patent right due to non-payment of annual fee |