CN104467598A - 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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- CN104467598A CN104467598A CN201410624368.5A CN201410624368A CN104467598A CN 104467598 A CN104467598 A CN 104467598A CN 201410624368 A CN201410624368 A CN 201410624368A CN 104467598 A CN104467598 A CN 104467598A
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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 resist technology field, in particular, the control method of particularly a kind of generator low-frequency oscillation detection based on field regulator and off-the-line protection.
Background technology
Due to generator control apparatus design defect, fault or control improper, usually can cause generator generation low-frequency oscillation, thus cause electrical network to cause forcing low-frequency oscillation, this vibration causes serious threat to the stable of electric power system.
Automatic excitation adjustor of generator is the control core of Excitation Controller.In order to improve the stability of electrical network, existing field regulator is configured with power system stabilizer function, utilizes PSS to strengthen the damping suppressing generator low-frequency oscillation.But when forcing low-frequency oscillation, source of forcing does not disappear, and when oscillation amplitude and frequency exceed PSS effective range, still can threaten to the stabilization of power grids, causes great economic loss and social influence consequence.
When there is this vibration, best bet is excised as early as possible by the generator of initiation, in order to avoid the instability causing electrical network larger.But the Control protection equipment of generation current machine does not also force the detection of low-frequency oscillation and the function of off-the-line protection for this.
Summary of the invention
The object of the present invention is to provide the control method of a kind of generator low-frequency oscillation detection based on field regulator and off-the-line protection; the method passes through automatic excitation adjustor of generator; detect timely forcing low-frequency oscillation; when oscillation amplitude and frequency reach certain scope; duration is when exceeding certain time length; for avoiding causing, large impact is caused on electric power system, and realize protecting generator automatic parallel off.
In order to solve problem set forth above, the technical solution used in the present invention is:
Based on the generator low-frequency oscillation detection of field regulator and the control method of off-the-line protection, the method comprises the following steps:
S1. the detection of low-frequency oscillation, the oscillation amplitude Δ P of the frequency of oscillation Fmax that when utilizing field regulator to detect and calculate low-frequency oscillation, amplitude is maximum and active power;
S2. judge that this low-frequency oscillation is weak/negative damping low-frequency oscillation or forces power low-frequency oscillation according to the oscillation amplitude Δ P of the maximum frequency of oscillation Fmax of amplitude determined in step S1 and active power;
S3. when low-frequency oscillation is for forcing power low-frequency oscillation, and oscillation amplitude Δ P is more than a setting threshold values P
ifthe maximum frequency of oscillation Fmax of amplitude is in a setting range Fsetmin<Fmax<Fsetmax, when the duration T of vibration is more than a setting-up time Tset, field regulator sends protection act signal, makes generator off-the-line;
According to a preferred embodiment of the invention: described step S1 specifically comprises the following steps:
S11. field regulator is adopted to measure the fluctuation variation track of the set end voltage U of generator;
S12. wavelet analysis method is adopted to extract the frequency spectrum of voltage U fluctuation change;
S13. according to the amplitude of frequency spectrum, the frequency of oscillation Fmax that amplitude is maximum is filtered out;
S14. adopt the fluctuation change of ime-domain measuring method to the machine end active-power P of generator to carry out real-time determination and analysis, calculate the oscillation amplitude Δ P of active power during low-frequency oscillation.
According to a preferred embodiment of the invention: described step S2 is specially: judgement is compared to the oscillation amplitude Δ P of active power, when oscillation amplitude Δ P is within the effective range of power system stabilizer, this low-frequency oscillation is weak/negative damping low-frequency oscillation, field regulator normally utilizes power system stabilizer to strengthen the damping suppressing generator low-frequency oscillation, otherwise this low-frequency oscillation is for forcing power low-frequency oscillation;
According to a preferred embodiment of the invention: when low-frequency oscillation is for forcing power low-frequency oscillation, also comprise between described step S2 and S3, when oscillation amplitude Δ P is more than an alarming threshold value P
valvetime, field regulator sends alarm signal.
According to a preferred embodiment of the invention: also comprise after described step S3: S4. is as power amplification d Δ P
k/ d Δ P
k-1when>=1.05, field regulator sends increasing oscillation signal, as power amplification d Δ P
k/ d Δ P
k-1when≤0.95, field regulator sends convergent oscillation signal.
Compared with prior art; beneficial effect of the present invention is: the present invention passes through adding off-the-line defence program in automatic excitation adjustor of generator; namely to forcing low-frequency oscillation to detect timely; when oscillation amplitude and frequency reach certain scope; duration is when exceeding certain time length; for avoiding causing, large impact being caused on electric power system, sending protection act signal, and then realize the function to the protection of generator automatic parallel off.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the flow chart of the control method of the generator low-frequency oscillation detection based on field regulator of the present invention and off-the-line protection.
Fig. 2 is the particular flow sheet of step S1 in Fig. 1 of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described in detail, can be easier to make advantages and features of the invention be readily appreciated by one skilled in the art, thus more explicit defining is made to protection scope of the present invention.
Consult shown in Fig. 1 to Fig. 2, the control method of a kind of generator low-frequency oscillation detection based on field regulator provided by the invention and off-the-line protection, the method comprises the following steps:
The detection of the first step, low-frequency oscillation, when there is low-frequency oscillation, first-harmonic (50Hz) amplitude of the set end voltage U of generator changes by certain frequency and amplitude, the oscillation amplitude Δ P of the frequency of oscillation Fmax that when the present invention utilizes field regulator to detect and calculates low-frequency oscillation, amplitude is maximum and active power; Be specially:
First, field regulator is adopted to measure the fluctuation variation track of the set end voltage U of generator;
Secondly wavelet analysis method, is adopted to extract the frequency spectrum of voltage U fluctuation change;
Then, according to the amplitude of frequency spectrum, the frequency of oscillation Fmax that amplitude is maximum is filtered out;
Finally, when there is low-frequency oscillation, the machine end active-power P of generator vibrates thereupon, the size of its oscillation amplitude, weigh the degree of vibration, amplitude is larger, vibrate more serious, the present invention adopts the fluctuation change of ime-domain measuring method to the machine end active-power P of generator to carry out real-time determination and analysis, calculates the oscillation amplitude Δ P of active power during low-frequency oscillation.
As preferably, what the field regulator in the present embodiment adopted is chip is DSP28335, and it measures picking rate can bring up to more than 360, every cycle (50Hz) than common field regulator.
Second step, judge that this low-frequency oscillation is weak/negative damping low-frequency oscillation or forces power low-frequency oscillation according to the oscillation amplitude Δ P of the maximum frequency of oscillation Fmax of amplitude determined in the first step and active power; Be specially: judgement is compared to the oscillation amplitude Δ P of active power, when oscillation amplitude Δ P is within the effective range of power system stabilizer, this low-frequency oscillation is weak/negative damping low-frequency oscillation, field regulator normally utilizes power system stabilizer to strengthen the damping suppressing generator low-frequency oscillation, otherwise this low-frequency oscillation is for forcing power low-frequency oscillation;
3rd step, when low-frequency oscillation is for forcing power low-frequency oscillation, when oscillation amplitude Δ P is more than an alarming threshold value P
valvetime, field regulator sends alarm signal.
4th step, oscillation amplitude Δ P are more than a setting threshold values P
if, (P
if> P
valve) the maximum frequency of oscillation Fmax of amplitude is in a setting range Fsetmin<Fmax<Fsetmax, when the duration T of vibration is more than a setting-up time Tset, field regulator sends protection act signal, makes generator off-the-line;
5th step, as power amplification d Δ P
k/ d Δ P
k-1when>=1.05, field regulator sends increasing oscillation signal, as power amplification d Δ P
k/ d Δ P
k-1when≤0.95, field regulator sends convergent oscillation signal (wherein, k refers to the time of sampling, and k-1 refers to a front sampling time of sampling time k).
As preferably, in the present embodiment, set threshold values P
ifcan be many groups, the P namely increased successively
if 1, P
if 2, such setting-up time Tset also can be many groups, Tset1, Tset2 of namely increasing successively ..., in other words, at setting threshold values P
ifwhile increasing, setting-up time Tset can reduce gradually.
Control method in the present invention can adopt program to be added in field regulator; generator low-frequency oscillation detection and off-the-line protection can be achieved like this on the basis not increasing hardware device; the entry condition of this program is: the machine end active-power P of generator is greater than a set point Pset; or power system stabilizer comes into operation; the barring condition of this program is: the machine end active-power P of generator is less than a set point Pset; or power system stabilizer exits, or when increase and decrease operation appears in active power.
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 P
valve=5% rated power, setting threshold values P
if 1=15% rated power, setting-up time Tset2=15 cycle, P
if 2=20% rated power, setting-up time Tset1=10 cycle (above-mentioned numerical value can be changed according to the service condition of reality), now.
1, in field regulator, the entry condition of this program is: active-power P is greater than 50% rated power, or power system stabilizer comes into operation;
2, in field regulator, the barring condition of this program is: active-power P is less than 50% rated power, or PSS exits, or during active power increase and decrease operation;
3, the basis for estimation in control method is:
As the vibration frequency 0.1Hz<Fmax<3Hz of set end voltage U, and:
Power amplitude Δ P
k>=5%, then report to the police;
Power amplitude Δ P
k>=15%, continue 15 cycles, then cut machine;
Power amplitude Δ P
k>=20%, continue 10 cycles, then cut machine;
Power d Δ P
k/ d Δ P
k-1>=1.05, continue 3 cycles, send out increasing oscillation signal;
Power d Δ P
k/ d Δ P
k-1≤ 0.95, continue 3 cycles, send out convergent oscillation signal.
Above-described embodiment is the present invention's preferably execution mode; but embodiments of the present invention are not restricted to the described embodiments; change, the modification done under other any does not deviate from Spirit Essence of the present invention and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (5)
1., based on the generator low-frequency oscillation detection of field regulator and the control method of off-the-line protection, it is characterized in that, the method comprises the following steps:
S1. the detection of low-frequency oscillation, the oscillation amplitude Δ P of the frequency of oscillation Fmax that when utilizing field regulator to detect and calculate low-frequency oscillation, amplitude is maximum and active power;
S2. judge that this low-frequency oscillation is weak/negative damping low-frequency oscillation or forces power low-frequency oscillation according to the oscillation amplitude Δ P of the maximum frequency of oscillation Fmax of amplitude determined in step S1 and active power;
S3. when low-frequency oscillation is for forcing power low-frequency oscillation, and oscillation amplitude Δ P is more than a setting threshold values P
ifthe maximum frequency of oscillation Fmax of amplitude is in a setting range Fsetmin<Fmax<Fsetmax; when the duration T of vibration is more than a setting-up time Tset, field regulator sends protection act signal, makes generator off-the-line.
2. the control method of the generator low-frequency oscillation detection based on field regulator according to claim 1 and off-the-line protection, it is characterized in that, described step S1 specifically comprises the following steps:
S11. field regulator is adopted to measure the fluctuation variation track of the set end voltage U of generator;
S12. wavelet analysis method is adopted to extract the frequency spectrum of voltage U fluctuation change;
S13. according to the amplitude of frequency spectrum, the frequency of oscillation Fmax that amplitude is maximum is filtered out;
S14. adopt the fluctuation change of ime-domain measuring method to the machine end active-power P of generator to carry out real-time determination and analysis, calculate the oscillation amplitude Δ P of active power during low-frequency oscillation.
3. the control method of the generator low-frequency oscillation detection based on field regulator according to claim 1 and off-the-line protection, it is characterized in that, described step S2 is specially:
Judgement is compared to the oscillation amplitude Δ P of active power, when oscillation amplitude Δ P is within the effective range of power system stabilizer, this low-frequency oscillation is weak/negative damping low-frequency oscillation, field regulator normally utilizes power system stabilizer to strengthen the damping suppressing generator low-frequency oscillation, otherwise this low-frequency oscillation is for forcing power low-frequency oscillation.
4. the control method of the generator low-frequency oscillation detection based on field regulator according to claim 1 and off-the-line protection; it is characterized in that; when low-frequency oscillation is for forcing power low-frequency oscillation, also comprise between described step S2 and S3, when oscillation amplitude Δ P is more than an alarming threshold value P
valvetime, field regulator sends alarm signal.
5. the control method of the generator low-frequency oscillation detection based on field regulator according to claim 1 and off-the-line protection, is characterized in that, also comprise after described step S3:
S4. as power amplification d Δ P
k/ d Δ P
k-1when>=1.05, field regulator sends increasing oscillation signal, as power amplification d Δ P
k/ d Δ P
k-1when≤0.95, field regulator sends convergent oscillation signal.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107732940A (en) * | 2017-10-19 | 2018-02-23 | 广西电网有限责任公司电力科学研究院 | A kind of parameters of power system stabilizer Optimum Experiment 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 |
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| CN102650657B (en) * | 2012-04-10 | 2014-12-31 | 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 |
| CN102914718B (en) * | 2012-11-13 | 2014-07-16 | 山东大学 | Low frequency oscillation distinguishing method based on response ingredient and oscillation characteristic identification |
| CN102944798B (en) * | 2012-11-29 | 2015-05-20 | 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 |
| CN104111405B (en) * | 2014-06-23 | 2016-10-05 | 华中科技大学 | A kind of low-frequency oscillation of electric power system source location method based on damping torque analytic process |
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| 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•工程科技Ⅱ辑》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107732940A (en) * | 2017-10-19 | 2018-02-23 | 广西电网有限责任公司电力科学研究院 | A kind of parameters of power system stabilizer Optimum Experiment method based on ADPSS |
| 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 |
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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 |
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