CN205670749U - Generator excited system - Google Patents
Generator excited system Download PDFInfo
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- CN205670749U CN205670749U CN201620116300.0U CN201620116300U CN205670749U CN 205670749 U CN205670749 U CN 205670749U CN 201620116300 U CN201620116300 U CN 201620116300U CN 205670749 U CN205670749 U CN 205670749U
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Abstract
This utility model provides a kind of generator excited system, including exciting transformer, described exciting transformer includes transformer core and the transformator winding being wound on described transformer core, also include reactor, described reactor include with core of reactor and be wound on described core of reactor reactor winding, being provided with shielding element between described transformer core and described core of reactor, the magnetic line of force of described reactor is mutually perpendicular to the magnetic line of force of described exciting transformer.Terminal voltage waveform by the reactor that is connected with exciting transformer of increase, when can effectively stop higher hamonic wave entrance exciting transformer high-pressure side to affect electromotor zero load or underloading.
Description
Technical field
This utility model relates to generator voltage control field, particularly relates to a kind of generator excited system.
Background technology
When electromotor isolated power grid or light running, easily there is breach or spike in generator voltage, such as accompanying drawing 1 institute
Show, for the oscillogram of terminal voltage, generator voltage waveform breach or spike during certain power station generator zero load in prior art
Easily electric equipment is produced serious harm, electrical network is produced simultaneously and pollute.
Along with the raising of user power utilization prescription, process generator voltage and occur that the phenomenon of spike or breach seems
Particularly important.Finding through research, generator voltage occurs that spike and breach are due to the silicon controlled rectifier in excitation system
The intrinsic phenomenon of one that part produces when the change of current, owing to silicon controlled critical rate of rise of on state current di/dt is excessive, excitation is whole
Angle overlap during the streaming system change of current is too small to be caused, at present, by increasing the winding inductance of exciting transformer to increase excitation-transformation variable
The short-circuit impedance of depressor reduces the problem of generator voltage spike and breach, but, increase the winding electricity of exciting transformer
Sense can cause the sufficiently bulky of exciting transformer, and the additional issue of exciting transformer low-pressure side inductance value, causes exciting transformer temperature rise
The highest, the respective response time of static exciter system increases, and the most a large amount of higher hamonic waves are entered into by electromagnetic coupled
The high-pressure side of exciting transformer and make terminal voltage waveform that spike occur, therefore, electromotor is unloaded or generating during light running
Set end voltage occurs that the problem of spike or breach has become serious puzzlement in the industry.
Utility model content
Based on this, this utility model is to provide the electromotor that can effectively reduce generator voltage spike or breach to encourage
Magnetic system.
According to an aspect of the present utility model, it is provided that a kind of generator excited system, including for being connected with electromotor
Exciting transformer, described exciting transformer include transformer core and the transformator that is wound on described transformer core around
Resistance, also include reactor, described reactor include with core of reactor and the reactor that is wound on described core of reactor around
Resistance, is provided with shielding element between described transformer core and described core of reactor, the magnetic line of force of described reactor is encouraged with described
The magnetic line of force of magnetic transformer is mutually perpendicular to.
By above-mentioned generator excited system, the reactor being connected with exciting transformer by increase so that reactor
Magnetic field is mutually isolated with exciting transformer magnetic field, and the magnetic line of force of the magnetic line of force of reactor and exciting transformer is mutually perpendicular to, can
Affect electromotor zero load or terminal voltage waveform during underloading effectively to stop higher hamonic wave to enter exciting transformer high-pressure side.
Accompanying drawing explanation
Generator voltage oscillogram when Fig. 1 is electromotor no-load running in prior art.
The structural representation of the electromotor unit that Fig. 2 is provided by this utility model one embodiment.
The schematic diagram of the generator excited system parameter designing system that Fig. 3 is provided by another embodiment of this utility model.
Generator voltage when Fig. 4 is the electromotor no-load running using this utility model embodiment generator excited system
Oscillogram.
The schematic diagram of the generator excited system parameter designing system that Fig. 5 is provided by this utility model the second embodiment.
Detailed description of the invention
For making the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing and specifically real
Execute mode, this utility model is described in further detail.It should be appreciated that detailed description of the invention described herein
Only in order to explain this utility model, do not limit protection domain of the present utility model.
Refer to Fig. 2, the generator excited system provided by this utility model one embodiment, including for electromotor
The exciting transformer 14 connected, described exciting transformer 14 includes transformer core and is wound in the change on described transformer core
Depressor winds, and also includes that reactor 18, described reactor 18 include and core of reactor and being wound on described core of reactor
Reactor winding, be provided with shielding element (not shown), described reactance between described transformer core and described core of reactor
The magnetic line of force of device 18 is mutually perpendicular to the magnetic line of force of described exciting transformer 14.
Wherein exciting transformer 14 is a kind of device providing three-phase AC excitation power supply exclusively for generator excited system,
Three phase mains is converted into generator amature DC source by controllable silicon by excitation system, forms generator excitation magnetic field, passes through
Excitation system regulation SCR Trigger Angle, reaches to regulate motor terminal voltage and idle purpose.This generator excited system includes
The reactor 18 set up, exciting transformer 14 includes transformer core and transformator winding, and reactor 18 includes core of reactor
Wind with reactor, first coil that wherein reactor winding includes being connected in series respectively with exciting transformer three-phase respectively, the
Two coil and tertiary coil.Shielding element is set between transformer core and core of reactor, by shielding element by reactor
The magnetic field of iron core and the magnetic field of transformer core are mutually isolated.This shielding element is usually made up of metal material, such as ferrum
Thin slice, the magnetic line of force of reactor 18 is mutually perpendicular to the magnetic line of force of exciting transformer 14, can avoid the impact of electromagnetic coupled, subtract
The silicon controlled critical rate of rise of on state current di/dt of few exciting transformer 14.
Reactor 18 is connected with the low-pressure side of exciting transformer 14, can stop the higher hamonic wave of exciting transformer 14 low-pressure side
Excitation high-pressure side is entered into by electromagnetic coupled effect.Preferably, transformer core is mutually perpendicular to core of reactor, by inciting somebody to action
The orthogonal setting of iron core, can make the magnetic line of force of reactor 18 and the magnetic line of force of exciting transformer 14 be mutually perpendicular to.In order to
Preferred arrangement, transformer core and core of reactor vertically hierarchal arrangement, concrete, transformer core and reactor ferrum
Core is vertically aligned, and shielding element is arranged between transformer core and core of reactor, transformer core and reactor
Iron core, in being symmetrical arranged up and down, can reduce the volume of generator excited system, optimizes the design of generator excited system.
Preferably, reactor 18 can increase to the inside of exciting transformer 14, exciting transformer 14 includes transformator
Housing, may be contained within transformer core, transformator winding, core of reactor and reactor winding in described transformer shell body.
Reactor 18 is arranged at the inside of exciting transformer 14, the structure design of whole generator excited system can be simplified, save
Exploitation and design cost, strengthen the adaptability of exciting transformer 14.It should be understood that reactor 18 and exciting transformer 14 also may be used
With separately positioned, as long as the magnetic line of force of the magnetic line of force and exciting transformer 14 that can reach reactor 18 is mutually perpendicular to, prevention is encouraged
The higher hamonic wave of magnetic transformer 14 low-pressure side enters into excitation high-pressure side by electromagnetic coupled effect and just may be used.
By the provided generator excited system of above-described embodiment, the reactor being connected with exciting transformer by increase
18 so that the magnetic field of reactor 18 is mutually isolated with exciting transformer 14 magnetic field, and the magnetic line of force of reactor 18 and excitation transformation
The magnetic line of force of device 14 is mutually perpendicular to, and can effectively stop higher hamonic wave to enter exciting transformer 14 high-pressure side affects electromotor sky
Terminal voltage waveform when load or underloading.
As it is shown on figure 3, in another embodiment, it is provided that a kind of generator excited system parameter designing system, including
Emulation module 20, response time determine that module 21, induction reactance determine that module 22, pressure drop determine that module 23 and electric current determine module
24。
Emulation module 20 is used for setting up electromotor unit phantom, and phantom includes the generating being connected with bus side
Generator excited system and excitation con-trol unit that machine stator is connected with described bus opposite side and encourage with described electromotor
The generator amature that magnetic system and described excitation con-trol unit connect.
In the present embodiment, electromotor unit phantom is concrete as in figure 2 it is shown, generator excited system includes excitation transformation
Device 14 and reactor 18, exciting transformer 14 includes transformer core and the transformator winding being wound on transformer core, electricity
Anti-device 18 include core of reactor and be wound on core of reactor reactor winding, reactor winding include respectively with excitation
First coil, the second coil and the tertiary coil that transformator 14 three-phase is connected in series respectively.Generator amature 11 and bus 10
Side connects, and the high-pressure side of exciting transformer 14 and excitation con-trol unit 15 all opposite sides with bus 10 are connected.Excitation transformation
The low-pressure side of device 14 is connected with reactor 18.
Preferably, this electromotor unit phantom also includes the excitation rectification unit 16 being connected with reactor 18.Excitation
Transformator 14 is connected with excitation rectification unit 16 by reactor 18, and this excitation con-trol unit 15 is also with excitation rectification unit 16 even
Connect.Voltage end output voltage can be carried out rectification and filtering by excitation rectification unit 16, reach more accurately analog simulation
Result.
This electromotor unit phantom can select existing simulation software to realize, as built by MatLAB
Mould and emulation.Wherein the specific implementation of electromotor unit simulation modeling can also be achieved by the prior art, at this no longer
Repeat.
Response time determines that module 21 for obtaining the response time of generator excited system according to phantom.Electromotor
The response time of excitation system is the essential condition evaluating electromotor unit operation, therefore need to guarantee electromotor unit design to send out
The response time of motor excitation system meets pre-conditioned.Generally, can be by inputting exciting transformer phase in phantom
Related parameter, electromotor relevant parameter and excitation con-trol unit relevant parameter, simulated practical operation situation, then encouraged by amendment
Pid parameter simulation in magnet control unit obtains the response time of generator excited system.
Induction reactance determines that module 22, for when response time meets pre-conditioned, obtains the induction reactance of reactor.By emulation
Modeling obtains and meets pre-conditioned response time, wherein meets and pre-conditioned refers to described generator excited system voltage
Rise time and fall time correspond with preset range, the concrete rise time is not more than 0.08s, and fall time is little
In 0.1s, obtain and the induction reactance of reactor when meeting pre-conditioned response time.
Pressure drop determines that module 23 is for determining reactor pressure drop according to induction reactance.Reactor pressure drop is line with the induction reactance of reactor
Sexual relationship, determines that according to induction reactance the concrete formula of reactor pressure drop is:
Reactor pressure drop=2*3.14*f*400*L；
Wherein frequency 50HZ on the basis of f, L is reactor induction reactance.
Electric current determines that module 24 is for according to exciting transformer rated voltage, excitation voltage device rated current, default excitation
The rated exciting current of multiple, the rated excitation voltage of electromotor and electromotor obtains the rated current of reactor.This reactance
The computing formula of the rated current of device specifically includes as follows:
The rated current of reactor=exciting transformer felling electric current * 1.1；
Exciting transformer capacity=electromotor rated excitation voltage * electromotor rated exciting current * H；
Exciting transformer felling voltage=K* electromotor rated excitation voltage * rectification coefficient/silicon controlled controlling dead error system
Number；
Wherein, K is for presetting excitation multiple, and rectification coefficient is theoretical system, and usual value is 1.35, and silicon controlled controls dead
Fauna number is empirical parameter, and usual value is 1.064, and H is the coefficient range equivalent according to excitation forcing ratio, usual value be 3～
Between 3.3.Preset excitation multiple to be configured according to the needs of user or electrical network, generally between 1.6～2.5, preferably
It is 1.8.
By above-mentioned generator excited system parameter designing system, set up generating set emulation mould by emulation module 20
Type, induction reactance determine module 22, pressure drop determine module 23 and electric current determine module 24 by obtain exciting transformer, electromotor with
And the relevant parameter of excitation con-trol unit is as phantom input and according to the relation between itself and reactor, calculates respectively and obtain
Obtain the induction reactance of reactor, pressure drop and rated current, to obtain the parameter of the optimum generator excited system determined.By really
Determine generator excited system parameter, design reactor according to generator excitation figure parameters, thus can farthest reduce very
To eliminating generator voltage waveform spike or breach.As shown in Figure 4, the transformator for using above-mentioned embodiment to provide is encouraged
Magnetic system and parameter designing system thereof, by the generating obtained after increasing winding reactor in the voltage side of exciting transformer
Generator voltage oscillogram during machine no-load running, it can be seen that in power transformation device terminal voltage waveform without spike or lack
Mouthful.
In another embodiment, this refers to Fig. 5, and parameter designing system also includes that pressure drop determines module 25 and encourages by force again
Number determines module 26, and this pressure drop determines that module 25 is for according to described excitation voltage device felling voltage and described exciting transformer
Short-circuit impedance, obtains described exciting transformer pressure drop.Excitation forcing ratio determines that module 26 is for according to described reactor pressure drop, described
The rated excitation voltage of exciting transformer pressure drop and described electromotor, it is thus achieved that the excitation forcing ratio of described generator excited system.
Described exciting transformer pressure drop is obtained according to excitation voltage device felling voltage and exciting transformer short-circuit impedance
Specific formula for calculation is: exciting transformer pressure drop=exciting transformer felling voltage * exciting transformer short-circuit impedance；According to reactance
The rated excitation voltage of device pressure drop, exciting transformer pressure drop and electromotor obtains the tool of the excitation forcing ratio of generator excited system
Body computing formula is: (exciting transformer felling voltage-reactor pressure drop-exciting transformer pressure drop) * rectification coefficient/silicon controlled
Controlling dead error coefficient/electromotor rated excitation voltage.Wherein, rectification coefficient is theoretical coefficient, and usual value is 1.35, controllable silicon
Controlling dead error coefficient be empirical parameter, usual value is 1.064.Obtain and adjust the excitation forcing ratio of generator excited system,
Can assist to obtain the spike solving generator voltage waveform during electromotor no-load running of optimum or gap problem further
Scheme, so that it is determined that the design parameter corresponding with this optimal case.
The excitation forcing ratio of generator excited system be evaluate electromotor unit operation another essential condition, by obtain and
Adjust the excitation forcing ratio of generator excited system, can assist to generate electricity during the solution electromotor no-load running obtaining optimum further
The spike of set end voltage waveform or the scheme of gap problem, so that it is determined that the design parameter corresponding with this optimal case.
The foregoing describe detailed description of the invention of the present utility model, therefore it describes more concrete and detailed, but can not be
And it is interpreted as the restriction to this utility model scope.For the person of ordinary skill of the art, new without departing from this practicality
On the premise of type design, it is also possible to making some deformation and improvement, these broadly fall into protection domain of the present utility model.
Claims (6)
1. a generator excited system, including the exciting transformer for being connected with electromotor, described exciting transformer includes
Transformer core and the transformator winding being wound on described transformer core, it is characterised in that: also include reactor, described electricity
Anti-device include with core of reactor and be wound on described core of reactor reactor winding, described transformer core is with described
Being provided with shielding element between core of reactor, the magnetic line of force of described reactor is the most vertical with the magnetic line of force of described exciting transformer
Directly.
2. generator excited system as claimed in claim 1, it is characterised in that: described transformer core and described reactor ferrum
Core vertically hierarchal arrangement.
3. generator excited system as claimed in claim 1, it is characterised in that: described reactor and described exciting transformer
Low-pressure side connects.
4. generator excited system as claimed in claim 1, it is characterised in that: described transformer core and described reactor ferrum
Core is mutually perpendicular to.
5. generator excited system as claimed in claim 1, it is characterised in that: described exciting transformer includes transformer shell
Body, described transformer core, transformator winding and described reactor may be contained within described transformer shell body.
6. generator excited system as claimed in claim 1, it is characterised in that: described reactor winding includes respectively with described
First coil, the second coil and the tertiary coil that exciting transformer three is connected.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620116300.0U CN205670749U (en) | 2016-02-04 | 2016-02-04 | Generator excited system |
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| CN201620116300.0U CN205670749U (en) | 2016-02-04 | 2016-02-04 | Generator excited system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105490600A (en) * | 2016-02-04 | 2016-04-13 | 华自科技股份有限公司 | Generator excitation system and parameter design method and system thereof |
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2016
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105490600A (en) * | 2016-02-04 | 2016-04-13 | 华自科技股份有限公司 | Generator excitation system and parameter design method and system thereof |
| WO2017133548A1 (en) * | 2016-02-04 | 2017-08-10 | 华自科技股份有限公司 | Generator excitation system and parameter design method and system thereof |
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