CN86107898A - Generator with AC field excitation, variable-speed and constant - Google Patents
Generator with AC field excitation, variable-speed and constant Download PDFInfo
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- CN86107898A CN86107898A CN 86107898 CN86107898A CN86107898A CN 86107898 A CN86107898 A CN 86107898A CN 86107898 CN86107898 CN 86107898 CN 86107898 A CN86107898 A CN 86107898A CN 86107898 A CN86107898 A CN 86107898A
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Abstract
A kind of generator with AC field excitation, variable-speed and constant constitutes closed loop automatic frequency regulating system by the AC energization synchronous generator that the polyphase ac excitation winding is arranged, variable frequency excitation device and frequency regulator.It is characterized in that the variable frequency excitation device connects by certain phase sequence with the AC excitation winding, the regulated quantity of exporting according to frequency regulator produces the many phase alternating current of certain frequency for generator alternating current excitation usefulness.It allows prime mover freely to select working speed, makes it approaching or reaches optimum Working, and the tuning range of broad and higher FREQUENCY CONTROL precision are arranged.It can be applied to hydropower station or auxiliary generator is made at other all kinds of dynamic powers station.
Description
The present invention relates to a kind of Blast Furnace Top Gas Recovery Turbine Unit (TRT), particularly generator with AC field excitation, variable-speed and constant.
Vscf generator allows prime mover according to working conditions change, freely selects working speed, makes prime mover approaching all the time or reach optimum Working.For the prime mover that utilizes fluid energy such as the hydraulic turbine, air operated machine etc., particularly like this.On January 26th, 1986, the Chinese patent CN-ZL85105662 of Granted publication was Zhejiang University's " synchronously-asynchronous vscf generator " patent of invention, and this is the vscf generator that a kind of birotor synchronous machine that is all rotated by armature and magnetic pole and wire wound rotor asynchronous motor constitute.It must make two moving rotors, and mechanical structure is than single rotor formula complexity, and the electric energy of armature output must draw through brush and conducting ring, and generate output is restricted.
It is simple that the present invention is intended to design a kind of manufacturing process, and the vscf generator that is not particularly limited of manufacturing capacity.
The present invention constitutes closed loop automatic frequency regulating system by the AC energization synchronous generator of polyphase ac excitation winding, variable frequency excitation device and frequency regulator.Synchronous generator is dragged by prime mover.The stator of synchronous generator can be an armature, also can be magnetic field.When stator was armature, rotor was a rotary electromagnetic field; When stator was rotary electromagnetic field, rotor was an armature.
Conventional generator adopts direct current excitation to form fixed magnetic field bar none, drags rotation by prime mover, produces perceptual electromotive force in the armature.After motor was made, its magnetic pole logarithm was a constant, and generator frequency f only is decided by prime mover rotation speed n prime mover, f=F(n
Prime mover) be function of a single variable.
The present invention is characterized in to introduce the polyphase ac excitation, make generator amature produce rotary electromagnetic field, and rotor is done mechanical rotation simultaneously under prime mover drags.Like this, generator frequency f not only is decided by prime mover rotation speed n
Prime mover, also with the rotation speed n of rotary electromagnetic field
Electromagnetic fieldRelevant, i.e. f=F(n
Electromagnetic field, n
Prime mover) be binary function.
Theory analysis and facts have proved is introduced polyphase windings with many phase alternating current and can be produced rotary electromagnetic field, the rotation speed n of this rotary electromagnetic field
Electromagnetic fieldBe proportional to frequency of supply f
Supplyn
Electromagnetic field=(f supplies)/(P), wherein P is the magnetic pole logarithm.By changing frequency of supply f
Supply, can change the rotation speed n of rotary electromagnetic field
Electromagnetic fieldWhen prime mover working conditions change causes prime mover rotation speed n
Prime moverDuring change at random, as long as real-time regulated n
Electromagnetic field, to offset n at any time
Prime moverVariation, it is constant just to keep generator frequency f.The constant frequency generation principle of institute of the present invention foundation that Here it is.According to the kinematics principle of stacking, magnetic field in service is with respect to the actual speed ()/(n) and electromagnetic field rotating speed ()/(n) of armature
Electromagnetic fieldAnd mechanical separator speed ()/(n)
Prime moverBetween following relation arranged: ()/(n)=()/(n)
Electromagnetic field+ ()/(n)
Prime mover
The present invention is in order to scheme realization down.
Power supply produces rotary electromagnetic field to the polyphase ac excitation winding by many phase alternating current, adopts three-phase usually.It is provided by three-phase or heterogeneous variable frequency excitation device.The variable frequency excitation device can be existing various electric modulation frequency power, as prime mover-electromagnetic slip clutches-generator, speed governing electric-generating unit or electronics inverter etc.Structurally, AC energization synchronous generator and variable frequency excitation device can be made independent structures separately, also can merge into an integral body, are placed within the same support.The variable frequency excitation device connects by certain phase sequence with the polyphase ac excitation winding.It is according to the regulated quantity of frequency regulator output, and the many phase alternating current that produces certain frequency is used for the generator alternating current excitation.Its frequency is to be subjected to the control of frequency regulator and continually varying, thereby adapts to the requirement of constant frequency generation.The function of frequency regulator is, with generator frequency f and reference frequency (50 He Zhi) relatively, its difference through ratio, integration, differentiate after, output is as the frequency set-point of variable frequency excitation device.The automatic adjusting of excitation of the present invention is basic identical with the conventional generator configuration.The excitation of AC exciter can adopt usual ways such as self-excitation, separate excitation, and the exciter energy is directly taken from prime mover or synchronous generator.
Generator with AC field excitation, variable-speed and constant can be exported the alternating current of constant frequency under the situation of prime mover speed change, thereby allows the hydraulic turbine, air operated machine prime movers freely to select working speed, makes it approaching or reaches optimum Working, improves energy conversion efficiency.For large and medium-sized hydropower station, more simplified the speed governing and the appropriate authority of the hydraulic turbine, thereby reduced cost.Its manufacture process requirement is identical with conventional generator, still adopts the single rotor formula, and is therefore simple in structure, reliable.And its governing speed is fast, is difficult for step-out after being incorporated into the power networks, and helps the stabilization of power grids.Because synchronous generator itself has amplifying power, the required exciting power of polyphase ac excitation winding is much smaller than the synchronous generator power output, and therefore, required variable frequency excitation device can be a low capacity.By the principle of what amplification, can make jumbo vscf generator easily.It is an outstanding advantage of the present invention that the manufacturing capacity is not particularly limited.It can be widely used in large, medium and small type hydropower station or auxiliary generator is made at other all kinds of dynamic powers station.
In addition, because frequency adjustment is partly to carry out by the special excitation of synchronous machine, therefore required power controlling is also very little.Like this, adopt simple electronic frequency adjuster just can make complete machine that the tuning range of broad and higher FREQUENCY CONTROL precision are arranged.
The also independent operating but generator with AC field excitation, variable-speed and constant can be incorporated into the power networks.But the frequency adjustment operation with closed ring is promptly regulated automatically, but also open loop operation, i.e. manual adjustments.When adopting manual open loop operational mode, it comes down to a rated speed infinitely variable generator.
Accompanying drawing has been described one embodiment of the present of invention.Can illustrate in greater detail the details of invention in conjunction with the accompanying drawings.
Accompanying drawing is a kind of electrical schematic diagram of generator with AC field excitation, variable-speed and constant. (1) is prime mover among the figure, adopts the hydraulic turbine of 750 rev/mins of rated speeds. (2), (3), (4) are AC energization synchronous generator, 12 kilowatts of power, magnetic pole logarithm 2,750 rev/mins of rated speeds, AC excitation rated frequency 25 He Zhi, (2) synchronous generator rotor three-phase AC excitation winding wherein, (3) synchronous generator stator armature, (4) synchronous generator stator auxiliary winding. (5), (6), (7) constitute a variable frequency excitation device. (5) electromagnetic slip clutches wherein, (6), (7) are respectively rotor magnetic pole and the stator armature that the low capacity three-phase synchronous generator is an AC exciter. (8) frequency regulator. (9) controlled rectifier, the excitation pitch of the laps electric current of its control electromagnetic slip clutches (5) plays fm role. (10) field regulator. (11) controlled rectifier, the exciting current of its control synchronous generator rotor magnetic pole (6) changes stator armature (7) output voltage, realizes the excitation regulation to AC energization synchronous generator rotor three-phase AC excitation winding (2). (12) load of AC energization synchronous generator.
In the accompanying drawing, move by mechanical rotation and rotating to be in the same way of ac magnetic field that prime mover (1) drags.The direction of rotation of electromagnetic field is determined easily by the phase sequence that changes rotor three-phase AC excitation winding (2).
The rotor of prime mover (1), AC energization synchronous generator, the coaxial connection of electromagnetic slip clutches (5) power shaft.Drag by prime mover (1); Electromagnetic slip clutches (5) output then connects with the rotor of low capacity three-phase synchronous generator.During startup, the excitation winding of electromagnetic slip clutches (5) and AC exciter (6), (7) is respectively by accessory power supply (not drawing among the figure) excitation.Like this, drag down at prime mover, power shaft drives output shaft and rotates, and the three-phase alternating current that AC exciter (6), (7) produce produces rotary electromagnetic field through three-phase AC excitation winding (2), and its rotating speed is ()/(n)
Electromagnetic field, the rotor of AC energization synchronous generator is done mechanical rotation again under prime mover (1) drags, and its rotating speed is ()/(n)
Prime moverLike this, electromagnetic field is with sum velocity (vector and ()/(n)
Electromagnetic field+ ()/(n)
Prime mover) act on the stator armature (3) of AC energization synchronous generator, make stator armature (3), stator auxiliary winding (4) produce alternating current, stator auxiliary winding (4) is by controlled rectifier (9) and (11), respectively to the excitation pitch of the laps and AC exciter rotor magnetic pole (6) excitation of electromagnetic slip clutches (5), so vscf generator is built Hair Fixer.
After building pressure, accessory power supply withdraws from voluntarily.
When prime mover (1) rotating speed ()/(n)
Prime moverDuring variation, has a degenerative Automatic Frequency governor motion of frequency by what frequency regulator (8), controlled rectifier (9) and electromagnetic slip clutches (5) were formed, by AC exciter (6), (7), the circular electric-magnetic field rotary speed ()/(n) of real-time regulated AC energization synchronous generator rotor
Electromagnetic field, to keep the constant of synchronous generator output frequency.
When the synchronous generator set end voltage or side by side between unit during idle variation, have terminal voltage or an automatic governor motion of idle degenerative excitation by what field regulator (10) and controlled rectifier (11) were formed, will be by the excitation winding of AC exciter (6), (7), the magnetic field power of real time altering AC energization synchronous generator is constant or do not have the stable of the distribution of work to keep terminal voltage.
Revisal 86107898
After the preceding revisal of the capable revisal of file name page or leaf
Specification 1 18 produces induced potential and produces perceptual electromotive force
Claims (5)
1, a kind of vscf generator, it is characterized in that constituting closed loop automatic frequency regulating system by the AC energization synchronous generator that the polyphase ac excitation winding is arranged, variable frequency excitation device and frequency regulator, the polyphase ac excitation, make generator amature produce rotary electromagnetic field, and rotor is done mechanical movement simultaneously under prime mover drags, the variable frequency excitation device connects by certain phase sequence with the AC excitation winding, and it produces the many phase alternating current of certain frequency for generator alternating current excitation usefulness according to the regulated quantity of frequency regulator output.
2, by the said vscf generator of claim 1, the stator that it is characterized in that AC energization synchronous generator can be an armature, can be magnetic field also, and when stator was armature, rotor was a rotary electromagnetic field, and when stator was rotary electromagnetic field, rotor was an armature.
3, by the said vscf generator of claim 1, it is characterized in that polyphase ac excitation winding excitation is provided by three-phase or heterogeneous variable frequency excitation device with alternating current.
4, by the said vscf generator of claim 1, it is characterized in that frequency adjustment manually open loop move, when adopting manual open loop operational mode, it comes down to a rated speed infinitely variable generator.
5, by the said vscf generator of arbitrary claim in the claim 1 to 5, it is characterized in that AC energization synchronous generator and variable frequency excitation device can make independent structures separately, also can merge into an integral body, be placed within the same support.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86107898 CN86107898A (en) | 1986-11-18 | 1986-11-18 | Generator with AC field excitation, variable-speed and constant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86107898 CN86107898A (en) | 1986-11-18 | 1986-11-18 | Generator with AC field excitation, variable-speed and constant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN86107898A true CN86107898A (en) | 1987-08-12 |
Family
ID=4803722
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 86107898 Pending CN86107898A (en) | 1986-11-18 | 1986-11-18 | Generator with AC field excitation, variable-speed and constant |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN86107898A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101247064B (en) * | 2008-03-24 | 2010-06-09 | 王光顺 | Brushless ac excitation speed-changing same-frequency generator |
| CN102013777A (en) * | 2010-11-19 | 2011-04-13 | 黄伟敏 | Variable speed synchronous generator |
| CN102192100A (en) * | 2011-05-10 | 2011-09-21 | 哈电通用风能（江苏）有限公司 | Wind generating set |
| CN104410343A (en) * | 2014-12-22 | 2015-03-11 | 珠海格力电器股份有限公司 | Excitation control method and system, controller and air conditioner outdoor unit |
| CN113175418A (en) * | 2021-04-28 | 2021-07-27 | 上海电气风电集团股份有限公司 | Electric barring gear of direct-drive generator |
| CN117458740A (en) * | 2023-10-08 | 2024-01-26 | 陕西航空电气有限责任公司 | Variable speed constant frequency alternating current generator |
-
1986
- 1986-11-18 CN CN 86107898 patent/CN86107898A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101247064B (en) * | 2008-03-24 | 2010-06-09 | 王光顺 | Brushless ac excitation speed-changing same-frequency generator |
| CN102013777A (en) * | 2010-11-19 | 2011-04-13 | 黄伟敏 | Variable speed synchronous generator |
| CN102192100A (en) * | 2011-05-10 | 2011-09-21 | 哈电通用风能（江苏）有限公司 | Wind generating set |
| CN104410343A (en) * | 2014-12-22 | 2015-03-11 | 珠海格力电器股份有限公司 | Excitation control method and system, controller and air conditioner outdoor unit |
| CN113175418A (en) * | 2021-04-28 | 2021-07-27 | 上海电气风电集团股份有限公司 | Electric barring gear of direct-drive generator |
| CN117458740A (en) * | 2023-10-08 | 2024-01-26 | 陕西航空电气有限责任公司 | Variable speed constant frequency alternating current generator |
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