CN106026812B - A kind of permanent magnetic flux exciter control system and method suitable for variable-speed generator - Google Patents
A kind of permanent magnetic flux exciter control system and method suitable for variable-speed generator Download PDFInfo
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- CN106026812B CN106026812B CN201610602309.7A CN201610602309A CN106026812B CN 106026812 B CN106026812 B CN 106026812B CN 201610602309 A CN201610602309 A CN 201610602309A CN 106026812 B CN106026812 B CN 106026812B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/14—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field
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Abstract
The invention discloses a kind of permanent magnetic flux exciter control systems and method suitable for variable-speed generator.Conventional generator run on fixed rotating speed, fixed frequency operating mode under, adoptable generator excitation control method has the modes such as voltage close loop, current closed-loop.When generator speed changes, these excitation modes will lead to electrical equipment overexcitation.Perseverance magnetic flux excitation mode proposed by the present invention, can ensure that in the case of the arbitrary rotation speed change of generator electrical equipment overexcitation will not be caused, specific demand when meeting generator variable-speed operation to excitation system.
Description
Technical field：
The invention belongs to electric system automation fields, and in particular to a kind of permanent magnetic flux suitable for variable-speed generator is encouraged
Magnetic control system and method.
Background technology：
All it is grid-connected with power grid when conventional synchronous generator normal operation, generator voltage frequency is consistent with power grid, hair
Motor is in constant speed and determines the frequency method of operation.When generator voltage frequency is constant, excitation con-trol mode is usually voltage close loop
Mode, its role is to maintain generator voltage to stablize in setting value.
For the special operation condition of certain special electrical equipments, generator voltage frequency is needed to change in a certain range.
When frequency changes, if maintaining generator voltage constant using voltage close loop mode, it is possible to lead to electrical equipment overexcitation.
Therefore, for the generator of variable-speed operation, it is necessary to using the exciting method different from conventional generator.
Invention content：
The purpose of the present invention is to provide a kind of permanent magnetic flux exciter control systems and method suitable for variable-speed generator.
According to generator iron-core magnetic density formula：B=KU/f, (wherein K=1/4.44WS, wherein U are winding voltage, circle
Number is W, core section S), the raising of voltage and the reduction of frequency can lead to the increase of flux density.Flux density increases so that iron core
Saturation, exciting current increased dramatically, and cause overexcitation phenomenon.The used method of the present invention is by detecting generator voltage and frequency
Ratio U/f, exciter current of generator is then controlled by field regulator so that generator voltage following frequency change, with
It keeps U/f constant, to maintain magnetic flux constant, ensures that electrical equipment not will produce overexcitation in generator variable-speed operation.
In order to achieve the above object, the technical solution adopted by the present invention is：
A kind of permanent magnetic flux exciter control system suitable for variable-speed generator, including voltage acquisition module, frequency measurement mould
Block, magnetic flux give module, Integrated comparative module, lead-lag module, output violent change module, throw and move back control module and adjustment of field excitation
Device；Wherein, 3 input terminals of the Integrated comparative module are respectively with voltage acquisition module, frequency measuring block, magnetic flux to cover half
Block connects；The output end of the Integrated comparative module is successively after control module is moved back in lead-lag module, output violent change module, throwing
Connect with field regulator input terminal.
A kind of permanent magnetic flux excitation control method suitable for variable-speed generator, the perseverance magnetic flux excitation control method are based on above-mentioned
Permanent magnetic flux exciter control system, this method includes：When generator speed changes, the generator that frequency measuring block is detected is defeated
The frequency for going out voltage changes, and with the variation of frequency, changes the output of exciting current by field regulator so that power generation
The ratio of the amplitude U and frequency f of voltage maintain invariable during machine rotation speed change so that the magnetic flux of electrical equipment remains permanent
It is fixed, overexcitation will not occur during generator variable-speed operation.
The present invention, which further improves, to be：Generator outlet circuit breaker voltage and frequency are detected by voltage acquisition module
The variation of measurement module detecting system electric voltage frequency, it is common to judge generator whether in state of not generating electricity by way of merging two or more grid systems；If it is determined that
Generator has generated electricity and has not coupled with power grid, then field regulator is transferred to permanent flux regulator mode.
The present invention, which further improves, to be：Judgment method is：The breaker that generator is connect with system separates, that is, generates electricity
Machine is in state of not generating electricity by way of merging two or more grid systems；Or generator frequency different from power frequency, i.e. generator is in state of not generating electricity by way of merging two or more grid systems.
The present invention, which further improves, to be：Field regulator is transferred to permanent flux regulator mode and carries out automatically.
Compared with prior art, the present invention has following advantageous effect：
Using permanent generator voltage control mode when general field regulator normal work, this control mode is to establish
On the basis of generator voltage frequency is 50Hz invariable, if still this excitation mode is used to maintain power generation after frequency variation
Machine voltage constant, it will lead to generator and its load magnetic flux saturation.The present invention be can control the output of excitation system,
So that exciter current of generator is adjusted according to the variation of frequency, to maintain non-power frequency variable-speed operation synchronous generator and its
The operating magnetic field flux of load is basically unchanged, the overexcitation problem that magnetic flux saturated zone will not be caused.
Description of the drawings：
Fig. 1 is the permanent magnetic flux excitation con-trol functional block diagram of the present invention.
Reference sign：
1-voltage measurement module；2-frequency measuring blocks；3-magnetic fluxs give module；
4-Integrated comparative modules；5-lead-lag amplification modules；6-output violent change modules；
Control module is moved back in 7-throwings；8-field regulators.
Specific implementation mode：
Invention is made further instructions below in conjunction with attached drawing.
As shown in Figure 1, the present invention is on the basis of existing microcomputer type field regulator, permanent magnetic flux excitation con-trol is added and calculates
Method and program are realized.Field regulator of the present invention is given by voltage measurement module 1, frequency measuring block 2, Φ magnetic fluxs
Setup module 3, Integrated comparative module 4, lead-lag amplification module 5, output violent change 6, input exit module 7 and field regulator
8 compositions obtain generator magnetic flux value Φ by voltage measurement module 1 and frequency measuring block 2e, will by Integrated comparative module 4
Generator magnetic flux value Φe3 given Φ of module is given with magnetic fluxsIt is compared, obtains magnetic flux difference Φe-Φs, the signal is by super
Preceding lag amplification module 5 obtains output signal, then obtains amplitude limit as a result, through putting into and exiting mould after most through output violent change module 6
Exciting current is controlled using field regulator 8 after block 7, generator magnetic flux is made to maintain constant level.
In the present embodiment, when generator speed changes, generator output voltage that the frequency measuring block 2 is detected
Frequency can also change, and with the variation of frequency, change the output of exciting current by field regulator 8 so that generator speed
The ratio of the amplitude U and frequency f of voltage maintain invariable in change procedure, so that the magnetic flux of electrical equipment remains permanent
It is fixed, overexcitation will not occur during generator variable-speed operation.
In the present embodiment, generator outlet circuit breaker voltage and frequency measurement mould are detected by the voltage acquisition module 1
The variation of 2 detecting system electric voltage frequency of block, it is common to judge generator whether in state of not generating electricity by way of merging two or more grid systems.If it is determined that generator
It has generated electricity and has not coupled with power grid, then field regulator 8 has been transferred to permanent flux regulator mode.Judgment method is：Generator with
The breaker of system connection separates, i.e., generator is in state of not generating electricity by way of merging two or more grid systems；Or generator frequency is different from power frequency (50Hz),
I.e. generator is in state of not generating electricity by way of merging two or more grid systems.Field regulator 8 is transferred to permanent flux regulator mode and carries out automatically, without artificial
Intervene.
The above is only the preferred embodiment of patent of the present invention, not imposed any restrictions to patent of the present invention, every
Any simple modification, change and equivalent structure made by above example are changed according to the technology of the present invention essence, still fallen within
In the protection domain of technical solution of the present invention.
Claims (2)
1. a kind of permanent magnetic flux excitation control method suitable for variable-speed generator, it is characterised in that：The perseverance magnetic flux excitation con-trol side
Method based on permanent magnetic flux exciter control system include voltage acquisition module (1), frequency measuring block (2), magnetic flux give module
(3), control module (7) and adjustment of field excitation are moved back in Integrated comparative module (4), lead-lag module (5), output violent change module (6), throwing
Device (8)；Wherein, 3 input terminals of the Integrated comparative module (4) respectively with voltage acquisition module (1), frequency measuring block
(2), magnetic flux gives module (3) and connects；The output end of the Integrated comparative module (4) is successively through lead-lag module (5), output
Clipping module (6), throwing move back control module (7) and connect afterwards with field regulator (8) input terminal；
This method includes：When generator speed changes, the frequency hair for the generator output voltage that frequency measuring block (2) is detected
Changing changes the output of exciting current by field regulator (8) with the variation of frequency so that generator speed changes
The ratio of the amplitude U and frequency f of voltage maintain invariable in the process so that the magnetic flux of electrical equipment maintains constant, Bu Hui
There is overexcitation during generator variable-speed operation；
Generator outlet circuit breaker voltage and frequency measuring block (2) detecting system voltage are detected by voltage acquisition module (1)
The variation of frequency, it is common to judge generator whether in state of not generating electricity by way of merging two or more grid systems；If it is determined that generator generated electricity and not and
Power grid couples, then field regulator (8) is transferred to permanent flux regulator mode；
Judgment method is：The breaker that generator is connect with system separates, i.e., generator is in state of not generating electricity by way of merging two or more grid systems；Or hair
Electric machine frequency is in state of not generating electricity by way of merging two or more grid systems different from power frequency, i.e. generator.
2. perseverance magnetic flux excitation control method according to claim 1, it is characterised in that：Field regulator (8) is transferred to permanent magnetic
Logical control mode carries out automatically.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610602309.7A CN106026812B (en) | 2016-07-27 | 2016-07-27 | A kind of permanent magnetic flux exciter control system and method suitable for variable-speed generator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610602309.7A CN106026812B (en) | 2016-07-27 | 2016-07-27 | A kind of permanent magnetic flux exciter control system and method suitable for variable-speed generator |
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| Publication Number | Publication Date |
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| CN106026812A CN106026812A (en) | 2016-10-12 |
| CN106026812B true CN106026812B (en) | 2018-07-24 |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108023518B (en) * | 2017-11-16 | 2020-05-29 | 云南电网有限责任公司电力科学研究院 | Excitation regulator |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1053152A (en) * | 1990-01-03 | 1991-07-17 | 北京市西城新开通用试验厂 | A kind of integrated synchronizer |
| CN101047357A (en) * | 2007-04-24 | 2007-10-03 | 中国北车集团永济电机厂 | Brushless exciting controller |
| CN103532454A (en) * | 2013-09-03 | 2014-01-22 | 西北工业大学 | Control method of two-phase brushless exciter in starting and power generation process of three-stage starting/power generation system |
-
2016
- 2016-07-27 CN CN201610602309.7A patent/CN106026812B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1053152A (en) * | 1990-01-03 | 1991-07-17 | 北京市西城新开通用试验厂 | A kind of integrated synchronizer |
| CN101047357A (en) * | 2007-04-24 | 2007-10-03 | 中国北车集团永济电机厂 | Brushless exciting controller |
| CN103532454A (en) * | 2013-09-03 | 2014-01-22 | 西北工业大学 | Control method of two-phase brushless exciter in starting and power generation process of three-stage starting/power generation system |
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| CN106026812A (en) | 2016-10-12 |
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