CN104467598B - Control method for generator low-frequency oscillation detection and splitting protection based on excitation regulator - Google Patents
Control method for generator low-frequency oscillation detection and splitting protection based on excitation regulator Download PDFInfo
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- CN104467598B CN104467598B CN201410624368.5A CN201410624368A CN104467598B CN 104467598 B CN104467598 B CN 104467598B CN 201410624368 A CN201410624368 A CN 201410624368A CN 104467598 B CN104467598 B CN 104467598B
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Abstract
The invention discloses a control method for generator low-frequency oscillation detection and splitting protection based on an excitation regulator. The method comprises the following steps that S1, low-frequency oscillation is detected, and the excitation regulator is utilized for detecting and calculating oscillation frequency Fmax with the largest amplitude and an oscillation amplitude delta P of active power in the low-frequency oscillation process; S2, whether the low-frequency oscillation is weak/negative damping low-frequency oscillation or forced power low-frequency oscillation is judged according to the oscillation frequency Fmax with the largest amplitude and the oscillation amplitude delta P of the active power, wherein the oscillation frequency Fmax and the oscillation amplitude delta P are determined in the step S1; S3, when the low-frequency oscillation is the forced power low-frequency oscillation, and the oscillation amplitude delta P is larger than a set threshold value P, the oscillation frequency Fmax with the largest amplitude is within the set range Fsetmin 1t, Fmax 1t and Fsetmax, when duration time T of oscillation is larger than set time Tset, a motion protecting signal is sent out, and therefore a generator is splitted. According to the control method, the forced low-frequency oscillation is detected in time, when the oscillation amplitude and the frequency reach a certain range and the duration time is longer than certain duration, the motion protecting signal is sent out, and therefore the automatic splitting protection function is achieved.
Description
Technical field
The present invention relates to generator low-frequency oscillation detection and off-the-line protection technique field, in particular, more particularly to one
Plant the control method of generator low-frequency oscillation detection and off-the-line protection based on field regulator.
Background technology
Due to the design defect of generator control apparatus, failure or control improper, can usually cause generator that low frequency occurs
Vibration, low-frequency oscillation is forced so as to cause power network to trigger, and this vibration causes serious threat to the stabilization of power system.
Automatic excitation adjustor of generator is the control core of Excitation Controller.In order to improve the stability of power network,
Existing field regulator is configured with power system stabilizer function, is increased using PSS and suppresses generator low-frequency oscillation
Damping.But when low-frequency oscillation is forced, force source not disappear, and oscillation amplitude and frequency are when exceeding PSS effective ranges, still
The stabilization of power grids can so be threatened, cause great economic loss and social influence consequence.
When there is this vibration, best bet is to cut off the generator of initiation as early as possible, in order to avoid cause power network bigger
It is unstable.But, the control protection equipment of generation current machine is not directed to this detection for forcing low-frequency oscillation and off-the-line also
The function of protection.
The content of the invention
Protected it is an object of the invention to provide a kind of generator low-frequency oscillation detection based on field regulator and off-the-line
Control method, the method to forcing low-frequency oscillation timely to be detected, works as oscillation amplitude by automatic excitation adjustor of generator
Certain scope is reached with frequency, when the duration exceedes certain time length, big influence is caused to power system to avoid causing,
And realize protecting generator automatic parallel off.
In order to solve posed problems above, the technical solution adopted by the present invention is：
The control method of generator low-frequency oscillation detection and the off-the-line protection based on field regulator, the method includes following
Step：
S1. the detection of low-frequency oscillation, amplitude maximum vibration when low-frequency oscillation is detected and calculated using field regulator
The oscillation amplitude Δ P of frequency Fmax and active power；
S2. according to the maximum frequency of oscillation Fmax of identified amplitude in the step S1 and oscillation amplitude Δ P of active power
The low-frequency oscillation is judged for weak/negative damping low-frequency oscillation or forces power low-frequency oscillation；
S3. when low-frequency oscillation is to force power low-frequency oscillation, and oscillation amplitude Δ P is more than a setting threshold values PIf, amplitude
Maximum frequency of oscillation Fmax is in a setting range Fsetmin<Fmax<In Fsetmax, the duration T of vibration sets more than one
Fix time Tset when, field regulator sends protection signal, makes generator off-the-line；
According to a preferred embodiment of the invention：The step S1 specifically includes following steps：
S11. the fluctuating change track of the set end voltage U of generator is measured using field regulator；
S12. the frequency spectrum of voltage U fluctuating changes is extracted using wavelet analysis method；
S13. according to the amplitude of frequency spectrum, the maximum frequency of oscillation Fmax of amplitude is filtered out；
S14. the fluctuating change using ime-domain measuring method to the generator terminal active-power P of generator carries out real-time detection and divides
Analysis, the oscillation amplitude Δ P of active power when calculating low-frequency oscillation.
According to a preferred embodiment of the invention：The step S2 is specially：Oscillation amplitude Δ P to active power is carried out
Multilevel iudge, when oscillation amplitude Δ P is within the effective range of power system stabilizer, the low-frequency oscillation is weak/negative
Damping frequencies oscillation, field regulator normally increases the resistance for suppressing generator low-frequency oscillation using power system stabilizer
Buddhist nun, otherwise, the low-frequency oscillation is to force power low-frequency oscillation；
According to a preferred embodiment of the invention：When low-frequency oscillation is to force power low-frequency oscillation, in the step S2
Also include between S3, when oscillation amplitude Δ P is more than an alarming threshold value PValveWhen, field regulator sends alarm signal.
According to a preferred embodiment of the invention：Also include after the step S3：S4. as power amplification d Δs Pk/dΔ
Pk-1When >=1.05, field regulator sends increasing oscillation signal, as power amplification d Δs Pk/dΔPk-1When≤0.95, Excitation Adjustment
Section device sends convergent oscillation signal.
Compared with prior art, the beneficial effects of the present invention are：The present invention in automatic excitation adjustor of generator by adding
Enter off-the-line defence program, i.e., to forcing low-frequency oscillation timely to be detected, when oscillation amplitude and frequency reach certain scope,
When duration exceedes certain time length, big influence is caused to power system to avoid causing, send protection signal, and then
Realize the function to the protection of generator automatic parallel off.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the control method of the generator low-frequency oscillation detection based on field regulator of the invention and off-the-line protection
Flow chart.
Fig. 2 is the particular flow sheet of step S1 in Fig. 1 of the present invention.
Specific embodiment
The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, so that advantages and features of the invention energy
It is easier to be readily appreciated by one skilled in the art, apparent is clearly defined so as to be made to protection scope of the present invention.
Refering to shown in Fig. 1 to Fig. 2, a kind of generator low-frequency oscillation detection based on field regulator that the present invention is provided and
The control method of off-the-line protection, the method is comprised the following steps：
The first step, the detection of low-frequency oscillation, when there is low-frequency oscillation, the fundamental wave (50Hz) of the set end voltage U of generator
Amplitude will be changed by certain frequency and amplitude, and amplitude is most when the present invention is detected and calculated low-frequency oscillation using field regulator
The big frequency of oscillation Fmax and oscillation amplitude Δ P of active power；Specially：
First, the fluctuating change track of the set end voltage U of generator is measured using field regulator；
Secondly the frequency spectrum of voltage U fluctuating changes, is extracted using wavelet analysis method；
Then, according to the amplitude of frequency spectrum, the maximum frequency of oscillation Fmax of amplitude is filtered out；
Finally, when there is low-frequency oscillation, the generator terminal active-power P of generator vibrates therewith, the size of its oscillation amplitude,
To weigh the degree of vibration, amplitude is bigger, and vibration is more serious, and the present invention is active to the generator terminal of generator using ime-domain measuring method
The fluctuating change of power P carries out real-time detection and analysis, the oscillation amplitude Δ P of active power when calculating low-frequency oscillation.
Preferably, it is DSP28335 that the field regulator in the present embodiment uses chip, its measurement picking rate
Every cycle (50Hz) can be brought up to than common field regulator more than 360 points.
Second step, the oscillation amplitude according to the maximum frequency of oscillation Fmax of identified amplitude in the first step and active power
Δ P judges the low-frequency oscillation for weak/negative damping low-frequency oscillation or forces power low-frequency oscillation；Specially：Active power is shaken
Swing amplitude Δ P and be compared judgement, when oscillation amplitude Δ P is within the effective range of power system stabilizer, this is low
It is weak/negative damping low-frequency oscillation that frequency vibration is swung, and field regulator normally increases suppression generator using power system stabilizer
The damping of low-frequency oscillation, otherwise, the low-frequency oscillation is to force power low-frequency oscillation；
3rd step, when low-frequency oscillation for force power low-frequency oscillation when, when oscillation amplitude Δ P is more than an alarming threshold value PValve
When, field regulator sends alarm signal.
4th step, oscillation amplitude Δ P are more than a setting threshold values PIf, (PIf＞ PValve) the maximum frequency of oscillation Fmax of amplitude is one
Setting range Fsetmin<Fmax<In Fsetmax, when the duration T of vibration is more than a setting time Tset, field regulator
Protection signal is sent, makes generator off-the-line；
5th step, as power amplification d Δs Pk/dΔPk-1When >=1.05, field regulator sends increasing oscillation signal, works as work(
Rate amplification d Δs Pk/dΔPk-1When≤0.95, field regulator sends convergent oscillation signal, and (wherein, k refers to the time of sampling, k-
1 refers to the preceding sampling time of sampling time k).
Preferably, in the present embodiment, setting threshold values PIfCan be multigroup, i.e., the P for increasing successivelyIf 1、PIf 2..., this
Sample setting time Tset can also be multigroup, i.e., Tset1, Tset2 ... for increasing successively, in other words, in setting threshold values PIf
While increase, setting time Tset can be gradually reduced.
Control method in the present invention can be added in field regulator using program, can so not increase hardware
Generator low-frequency oscillation detection and off-the-line protection are realized on the basis of equipment, the entry condition of the program is：The machine of generator
End active-power P is more than a setting value Pset, or power system stabilizer comes into operation, and the barring condition of the program is：
The generator terminal active-power P of generator is less than a setting value Pset, or power system stabilizer is exited, or active power goes out
During now increase and decrease operation.
Below by a specific embodiment, the invention will be described further：In the present embodiment, Fsetmin=
0.1Hz, Fsetmax=3Hz, Pset=50% rated power, alarming threshold value PValve=5% rated power, setting threshold values PIf 1=
15% rated power, setting time Tset2=15 cycles, PIf 2=20% rated power, setting time Tset1=10 cycles (on
The numerical value stated can be modified according to actual use condition), now.
1st, the entry condition of the program is in field regulator：Active-power P is more than 50% rated power, or power system
Stabilizer PSS comes into operation；
2nd, the barring condition of the program is in field regulator：Active-power P is less than 50% rated power, or PSS is exited,
Or during active power increase and decrease operation；
3rd, the basis for estimation in control method is：
As the vibration frequency 0.1Hz of set end voltage U<Fmax<3Hz, and：
Power amplitude Δ Pk>=5%, then alarm；
Power amplitude Δ Pk>=15%, continue 15 cycles, then cut machine；
Power amplitude Δ Pk>=20%, continue 10 cycles, then cut machine；
Power d Δs Pk/dΔPk-1>=1.05, continue 3 cycles, send out increasing oscillation signal；
Power d Δs Pk/dΔPk-1≤ 0.95, continue 3 cycles, send out convergent oscillation signal.
Above-described embodiment is the present invention preferably implementation method, but embodiments of the present invention are not by above-described embodiment
Limitation, it is other it is any without departing from Spirit Essence of the invention and the change, modification, replacement made under principle, combine, simplification,
Equivalent substitute mode is should be, is included within protection scope of the present invention.
Claims (3)
1. generator low-frequency oscillation detection based on field regulator and the control method of off-the-line protection, it is characterised in that the party
Method is comprised the following steps：
S1. the detection of low-frequency oscillation, amplitude maximum frequency of oscillation when low-frequency oscillation is detected and calculated using field regulator
The oscillation amplitude Δ P of Fmax and active power；
S2. the oscillation amplitude Δ P according to the maximum frequency of oscillation Fmax of identified amplitude in step S1 and active power judges
The low-frequency oscillation is weak/negative damping low-frequency oscillation or forces power low-frequency oscillation；
S3. when low-frequency oscillation is to force power low-frequency oscillation, and oscillation amplitude Δ P sets more than a setting threshold values P, and amplitude is maximum
Frequency of oscillation Fmax in a setting range Fsetmin<Fmax<In Fsetmax, when the duration T of vibration is more than a setting
Between Tset when, field regulator sends protection signal, makes generator off-the-line；
The step S1 specifically includes following steps：
S11. the fluctuating change track of the set end voltage U of generator is measured using field regulator；
S12. the frequency spectrum of voltage U fluctuating changes is extracted using wavelet analysis method；
S13. according to the amplitude of frequency spectrum, the maximum frequency of oscillation Fmax of amplitude is filtered out；
S14. the fluctuating change using ime-domain measuring method to the generator terminal active-power P of generator carries out real-time detection and analysis,
The oscillation amplitude Δ P of active power when calculating low-frequency oscillation；
The step S2 is specially：
Oscillation amplitude Δ P to active power is compared judgement, when oscillation amplitude Δ P is in power system stabilizer
When within effective range, the low-frequency oscillation is weak/negative damping low-frequency oscillation, and field regulator normally utilizes power system stabilizer, PSS
PSS suppresses the damping of generator low-frequency oscillation to increase, and otherwise, the low-frequency oscillation is to force power low-frequency oscillation.
2. the controlling party that generator low-frequency oscillation detection and off-the-line based on field regulator according to claim 1 are protected
Method, it is characterised in that when low-frequency oscillation is to force power low-frequency oscillation, also include between the step S2 and S3, when shaking
When swinging amplitude Δ P more than an alarming threshold value P valves, field regulator sends alarm signal.
3. the controlling party that generator low-frequency oscillation detection and off-the-line based on field regulator according to claim 1 are protected
Method, it is characterised in that also include after the step S3：
S4. as power amplification d Δs Pk/dΔPk-1When >=1.05, field regulator sends increasing oscillation signal,
As power amplification d Δs Pk/dΔPk-1When≤0.95, field regulator sends convergent oscillation signal；
Wherein, Δ Pk is the oscillation amplitude that the sampling time is k, and Δ Pk-1 is the vibration in a preceding sampling time of sampling time k
Amplitude, d Δs Pk is the differential to Δ Pk, and d Δs Pk-1 is the differential to Δ Pk-1.
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| CN201410624368.5A CN104467598B (en) | 2014-11-07 | 2014-11-07 | Control method for generator low-frequency oscillation detection and splitting protection based on excitation regulator |
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| CN107732940B (en) * | 2017-10-19 | 2021-11-02 | 广西电网有限责任公司电力科学研究院 | Power system stabilizer parameter optimization test method based on ADPSS |
| CN111864747A (en) * | 2020-08-13 | 2020-10-30 | 国网黑龙江省电力有限公司电力科学研究院 | Power grid oscillation splitting judgment method taking voltage as criterion |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102650657A (en) * | 2012-04-10 | 2012-08-29 | 中国电力科学研究院 | System and method for judging negative damping oscillation and forced oscillation based on second order difference method |
| CN102914718A (en) * | 2012-11-13 | 2013-02-06 | 山东大学 | Low frequency oscillation distinguishing method based on response ingredient and oscillation characteristic identification |
| CN102944798A (en) * | 2012-11-29 | 2013-02-27 | 武汉华中电力电网技术有限公司 | Negative-damping low-frequency oscillation and forced power oscillation distinguishing method |
| CN104111405A (en) * | 2014-06-23 | 2014-10-22 | 华中科技大学 | Damping torque analytical method-based low-frequency oscillating source positioning method of power system |
-
2014
- 2014-11-07 CN CN201410624368.5A patent/CN104467598B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102650657A (en) * | 2012-04-10 | 2012-08-29 | 中国电力科学研究院 | System and method for judging negative damping oscillation and forced oscillation based on second order difference method |
| CN102914718A (en) * | 2012-11-13 | 2013-02-06 | 山东大学 | Low frequency oscillation distinguishing method based on response ingredient and oscillation characteristic identification |
| CN102944798A (en) * | 2012-11-29 | 2013-02-27 | 武汉华中电力电网技术有限公司 | Negative-damping low-frequency oscillation and forced power oscillation distinguishing method |
| CN104111405A (en) * | 2014-06-23 | 2014-10-22 | 华中科技大学 | Damping torque analytical method-based low-frequency oscillating source positioning method of power system |
Non-Patent Citations (2)
| Title |
|---|
| 工程科技Ⅱ辑》.2013,第3-40页. * |
| 张一."低频振荡模式辨别方法及振荡机理判据研究".《中国优秀硕士学位论文全文数据库• * |
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Denomination of invention: Control method for generator low-frequency oscillation detection and splitting protection based on excitation regulator Effective date of registration: 20191104 Granted publication date: 20170524 Pledgee: Jiangsu bank Limited by Share Ltd Lishui branch Pledgor: NANJING ENERGIE ELECTRIC CO., LTD. Registration number: Y2019980000402 |
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Date of cancellation: 20201221 Granted publication date: 20170524 Pledgee: Jiangsu bank Limited by Share Ltd. Lishui branch Pledgor: NANJING ENERGIE ELECTRIC Co.,Ltd. Registration number: Y2019980000402 |