CN109412177A - Inhibit the method for ultra-low frequency oscillation based on novel ultralow frequency oscillation additional stabilizer - Google Patents
Inhibit the method for ultra-low frequency oscillation based on novel ultralow frequency oscillation additional stabilizer Download PDFInfo
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- CN109412177A CN109412177A CN201811123002.4A CN201811123002A CN109412177A CN 109412177 A CN109412177 A CN 109412177A CN 201811123002 A CN201811123002 A CN 201811123002A CN 109412177 A CN109412177 A CN 109412177A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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Abstract
The invention discloses a kind of methods for inhibiting ultra-low frequency oscillation based on novel ultralow frequency oscillation additional stabilizer, it is improved first against traditional PS S structure, low pass branch is added in traditional PS S structure, it constructs novel ultralow frequency and vibrates additional stabilizer, it is then based on several scenes collection, propose the parameter robust tuning method of novel ultralow frequency oscillation additional stabilizer, to obtain the parameter that system ultra-low frequency oscillation can be effectively suppressed under various working situation, novel ultralow frequency oscillation additional stabilizer is improved finally by these parameters, and the oscillation for inhibiting ultra-low frequency signal in power grid.
Description
Technical field
The invention belongs to electricity net safety stable control technology fields, more specifically, are related to a kind of based on novel super-low
Frequency vibration swings the method that additional stabilizer inhibits ultra-low frequency oscillation.
Background technique
The ultra-low frequency oscillation event that multiple oscillation frequency is lower than 0.1Hz occurs in the recent period for China's power grid, seriously threatens power train
System safe operation.2016 are dateed back, for Yunnan Power System when carrying out Asynchronous Interconnection experiment, it is 0.05Hz that frequency is produced in net,
The oscillation between 49.9~50.1Hz is fluctuated, oscillation continues 25 minutes.2017, during bright and beautiful Su Zhiliu carries out isolated island experiment,
Equally there is the ultra-low frequency oscillation phenomenon that frequency of oscillation is about 0.07Hz.2018, Sichuan DianKeYuan was independent to southwestern power grid
It finds in operation risk assessment, under Smaller load mode, can cause in a fault situation in net more than 50% AC line ultralow
Frequency oscillatory occurences.
For the inhibition problem of ultra-low frequency oscillation, existing research is mostly to inhibit ultralow frequency vibration based on optimization governor parameter
It swings, but the measure can cause the decline of governor speed adjusting performance while inhibiting ultra-low frequency oscillation.And correlative study shows to manage
By can above inhibit ultra-low frequency oscillation by additional PSS (power system stability adjuster), but traditional PS S is provided in ultralow frequency range
Damping is smaller, can not effectively inhibit ultra-low frequency oscillation.Secondly, traditional PS S always low-frequency range especially ultralow frequency range provide compared with
Big phase-lead is reliably damping to limit it in low-frequency range offer, in some instances it may even be possible to provide negative damping.Therefore, sharp
Inhibit the tactful and infeasible of ultra-low frequency oscillation with additional traditional PS S.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide one kind to vibrate additional stability based on novel ultralow frequency
The method that device inhibits ultra-low frequency oscillation by increasing low pass branch in traditional PS S structure, and then filters out ultra-low frequency oscillation signal
Ingredient, so that ultra-low frequency oscillation can be effectively suppressed.
For achieving the above object, the present invention is based on novel ultralow frequency oscillation additional stabilizers to inhibit ultra-low frequency oscillation
Method, which comprises the following steps:
(1), novel PSS control structure is constructed；
Simplify in traditional PS S1A and increase low pass branch in structure, constructs novel ultralow frequency oscillation additional stabilizer；
(2), setting novel ultralow frequency vibrates the parameter of additional stabilizer；
(2.1), setting novel ultralow frequency vibrates the low pass branch parameter of additional stabilizer；
(2.1.1), setting band logical link transmission function are as follows:
Wherein, T is symmetrical bandpass link time constant, and R is the penalty coefficient of band logical, can be adjusted by changing the size of R
Bandpass filter bandwidth is saved, s is the domain S operator；
Parameter in (2.1.2), setting band logical link；
According to band logical link centre frequencyThe amplitude at place is 1, and the parameter K in band logical link is arrangedL1With
KL2Are as follows:
According to transmission function G2(s) remaining parameter of band logical link is set；
Band logical link frequency f is setdWith the penalty coefficient R of band logical；
According to the operating condition of water turbine set, the scene collection W for generating ultra-low frequency oscillation is determined, then to all fields in scene collection
Scape is recognized one by one, forms frequency of oscillation collection F；
Wherein, wpIndicate p-th of scene of generation ultra-low frequency oscillation, fpIndicate ultra-low frequency oscillation corresponding to p-th of scene
Frequency；
According to frequency of oscillation collection F, f is setdAnd R:
Wherein, fminWith fmaxFor the minimum value and maximum value of frequency in frequency of oscillation collection F, σ is frequency allowance, and B is passband
Bandwidth makes bandpass filter bandwidth be B by constantly regulate R value；
(2.2), setting novel ultralow frequency vibrates other link parameters of additional stabilizer
(2.2.1), the objective function of building meter and ultra-low frequency oscillation scene collection under various working situation；
Wherein, uiIt vibrates for novel ultralow frequency to setting parameter in additional stabilizer, U is its feasible zone, and W is scene collection, α
(ui,wi) it is in scene situation wiWhen, system is set as u to setting parameteriWhen, real part corresponding to ultra-low frequency oscillation mode,
ξ'min(ui,wi) it is to damp minimum value, ξ in other oscillation modes other than ultra-low frequency oscillation mode0For given damping lower limit
Value；
(2.2.2), optimizing is iterated to above-mentioned objective function using particle swarm algorithm, final optimizing solves to obtain um,
Its built-in variable is each link setting parameter value of corresponding novel ultralow frequency oscillation additional stabilizer；
(3), novel ultralow frequency oscillation additional stabilizer is used in power grid, additional stabilizer is vibrated by novel ultralow frequency
In low pass branch filter out ultra-low frequency oscillation signal, to inhibit oscillation caused by ultra-low frequency signal.
Goal of the invention of the invention is achieved in that
The present invention is based on the methods that novel ultralow frequency oscillation additional stabilizer inhibits ultra-low frequency oscillation, first against tradition
PSS structure improves, and low pass branch is added in traditional PS S structure, and building novel ultralow frequency vibrates additional stabilizer, then
Based on several scenes collection, the parameter robust tuning method of novel ultralow frequency oscillation additional stabilizer is proposed, to obtain
The parameter that system ultra-low frequency oscillation can be effectively suppressed under various working situation improves novel super-low finally by these parameters
Frequency vibration swings additional stabilizer, and the oscillation for inhibiting ultra-low frequency signal in power grid.
Meanwhile the present invention is based on novel ultralow frequency oscillation additional stabilizer inhibit ultra-low frequency oscillation method also have it is following
The utility model has the advantages that
(1), PSS proposed by the invention compensates for traditional PS S existing deficiency during inhibiting ultra-low frequency oscillation, right
It can provide more structurally sound damping in ultra-low frequency oscillation, ultra-low frequency oscillation mode that can effectively in inhibition system；
(2), parameter tuning process proposed by the invention fully considers complicated case existing for system, adjusts resulting ginseng
Number has preferable inhibitory effect for the ultra-low frequency oscillation under various working.
Detailed description of the invention
Fig. 1 is that the present invention is based on the method flow diagrams that novel ultralow frequency oscillation additional stabilizer inhibits ultra-low frequency oscillation；
Fig. 2 is novel ultralow frequency oscillation additional stabilizer AULFOPSS structure chart；
Fig. 3 is certain water power region Transmission Corridor wiring diagram；
Fig. 4 is frequency departure variation track of the river May Day bridge #1 unit in scene 1；
Fig. 5 is frequency departure variation track of the river May Day bridge #1 unit in scene 2；
Fig. 6 is frequency departure variation track of the river May Day bridge #1 unit in scene 4.
Specific embodiment
A specific embodiment of the invention is described with reference to the accompanying drawing, preferably so as to those skilled in the art
Understand the present invention.Requiring particular attention is that in the following description, when known function and the detailed description of design perhaps
When can desalinate main contents of the invention, these descriptions will be ignored herein.
Embodiment
In the present embodiment, instance analysis being carried out to the water power group of planes in a certain area, Fig. 3 is that system equivalent simplifies topology,
Comprising 17 Hydropower Units, total installation of generating capacity is about 1200MW, and region internal loading is negligible, the power that a water power group of planes generates
220KV power grid is accessed by boosting, is then collected to 220KV substation, it is finally boosted to be attached reality with major network to 500KV
Now send outside.
We combine such as Fig. 1 below, to the present invention is based on novel ultralow frequency oscillation additional stabilizers to inhibit ultra-low frequency oscillation
Method be described in detail, specifically includes the following steps:
S1, the novel PSS control structure of building；
It is improved for traditional PS S, simplifies in typical PSS1A and add low pass branch on structure basis, enhance it
For the rejection ability of ultra-low frequency oscillation, forms novel ultralow frequency and vibrate additional stabilizer, structure is as shown in Figure 2；
S2, setting novel ultralow frequency vibrate the parameter of additional stabilizer；
In the present embodiment, by novel ultralow frequency oscillation additional stabilizer be arranged respectively at the river Chuan Tie factory #1, Chuanjiang River side #1,
On the inclined bridge #3 unit in river；
S2.1, setting novel ultralow frequency vibrate the low pass branch parameter of additional stabilizer；
In S2.1.1, novel ultralow frequency oscillation additional stabilizer structure, low pass branch can filter out ultra-low frequency oscillation letter
Number ingredient, the band logical link in low pass branch use differential filtering method, band logical link transmission function are as follows:
Wherein, T is symmetrical bandpass link time constant, and R is the penalty coefficient of band logical, can be adjusted by changing the size of R
Bandpass filter bandwidth is saved, s is the domain S operator；
Parameter in S2.1.2, setting band logical link；
The centre frequency of transmission functionWhen, the amplitude maximum of band logical link, phase zero can obtain
To G at this time2(jwd) i.e. are as follows:
For the parameter minimum for making band logical link need to be arranged, it is desirable that the amplitude at band logical link center frequency points is 1, then
KL1With KL2Setting are as follows:
According to transmission function G2(s) remaining parameter of band logical link is set；
By above-mentioned expression formula it is found that the setting of band logical link parameter needs clear fd、ωd=2 π fdAnd R value.Wherein,
fdValue be band logical link frequency, that is, should be the frequency of oscillation of ultra-low frequency oscillation mode；R is the penalty coefficient of band logical, with band
Logical width is related.And the operating condition strong correlation of ultra-low frequency oscillation frequency and the hydraulic turbine, therefore with water turbine set operating condition
Change, the frequency of oscillation of ultra-low frequency oscillation can change therewith.To make the frequency of oscillation under various operating condition situations in passband
In band, fdAnd the determination of R is with regard to particularly critical.Traditional setting method becomes.For this purpose, the present embodiment proposition is as follows
FdAnd the setting method of R:
According to the operating condition of water turbine set, the scene collection W for generating ultra-low frequency oscillation is determined, then to all fields in scene collection
Scape is recognized one by one, forms frequency of oscillation collection F；
Wherein, wpIndicate p-th of scene of generation ultra-low frequency oscillation, fpIndicate ultra-low frequency oscillation corresponding to p-th of scene
Frequency；
In the present embodiment, the operating condition of water turbine set is with different water hammer effect time constant value TwIt is characterized,
Form scene collection as shown in table 1 below:
Table 1 is part of generating units water hammer effect constant value Tw；
| Scene collection | Chuanjiang River side #1 | Wear inclined bridge #1 in river | River May Day bridge #1 | Chuansha level ground #1 | Card #1 is stepped in river |
| Scene 1 | 2.0 | 2.0 | 2.0 | 1.0 | 1.0 |
| Scene 2 | 1.0 | 2.0 | 3.0 | 2.0 | 4.0 |
| Scene 3 | 4.0 | 4.0 | 4.0 | 4.0 | 4.0 |
| Scene 4 | 2.5 | 2.5 | 3.0 | 3.0 | 4.0 |
| Scene 5 | 5.0 | 5.0 | 4.0 | 2.0 | 1.0 |
| Scene 6 | 5.0 | 5.0 | 5.0 | 5.0 | 5.0 |
Modal idenlification is carried out one by one for above-mentioned scene collection again, forms ultra-low frequency oscillation frequency set, table 2 institute in face specific as follows
Show；
Table 2 is ultra-low frequency oscillation frequency set；
According to frequency of oscillation collection F, f is setdAnd R:
Wherein, fminWith fmaxFor the minimum value and maximum value of frequency in frequency of oscillation collection F, σ is frequency allowance, be can be taken as
0.1, B is pass band, in the present embodiment, makes the bandpass filter bandwidth to be by constantly regulate R value, so that it is determined that the tool of R
Body numerical value.
Table 3 is band logical link correlated variables；
| Variable | Numerical value | Variable | Numerical value |
| fd | 0.0379 | TL1 | 3.6399 |
| R | 1.1 | TL2 | 4.0039 |
| KL1 | 231 | TL3 | 4.0039 |
| KL2 | 231 | TL4 | 4.4043 |
S2.2, setting novel ultralow frequency vibrate other link parameters of additional stabilizer
S2.2.1, the objective function of building meter and ultra-low frequency oscillation scene collection under various working situation；
Wherein, uiIt vibrates for novel ultralow frequency to setting parameter in additional stabilizer, U is its feasible zone, and W is scene collection, α
(ui,wi) it is in scene situation wiWhen, system is set as u to setting parameteriWhen, real part corresponding to ultra-low frequency oscillation mode,
ξ'min(ui,wi) it is to damp minimum value, ξ in other oscillation modes other than ultra-low frequency oscillation mode0For given damping lower limit
Value, is taken as 0.06；
S2.2.2, optimizing is iterated to above-mentioned objective function using particle swarm algorithm, final optimizing solves to obtain um,
Built-in variable is each link setting parameter value of corresponding novel ultralow frequency oscillation additional stabilizer；
Table 4 is novel ultralow frequency oscillation each link variable of additional stabilizer；
S3, novel ultralow frequency oscillation additional stabilizer is used in power grid, additional stabilizer is vibrated by novel ultralow frequency
In low pass branch filter out ultra-low frequency oscillation signal, to inhibit oscillation caused by ultra-low frequency signal.
For illustrate this patent mention novel inhibition ultra-low frequency oscillation PSS control structure and parameter tuning method it is effective
Property, river May Day bridge #1 unit has been presented in Fig. 4 in the frequency departure variation track of scene 1；It is shown in Fig. 4 the result shows that this specially
The AULF0PSS that is itd is proposed of benefit, can be effectively suppressed ultra-low frequency oscillation phenomenon by adjusting its parameter, compared to traditional PSS4B,
Its overshoot is few, and the ability that the time is short, and there is better inhibition to vibrate is calmed down in oscillation.
Fig. 5 and Fig. 6 are the unit frequency departure figure under other operating condition situations, as shown in Figure 5,6 the result shows that, this patent institute
The optimization method stated can effectively promote the damping characteristic of speed-regulating system under various complex working condition situations, inhibit ultra-low frequency oscillation
Phenomenon, and its effect of optimization is superior to traditional PSS4B.
Although the illustrative specific embodiment of the present invention is described above, in order to the technology of the art
Personnel understand the present invention, it should be apparent that the present invention is not limited to the range of specific embodiment, to the common skill of the art
For art personnel, if various change the attached claims limit and determine the spirit and scope of the present invention in, these
Variation is it will be apparent that all utilize the innovation and creation of present inventive concept in the column of protection.
Claims (3)
1. it is a kind of based on novel ultralow frequency oscillation additional stabilizer inhibit ultra-low frequency oscillation method, which is characterized in that including with
Lower step:
(1), novel PSS control structure is constructed；
Simplify in traditional PS S1A and increase low pass branch in structure, constructs novel ultralow frequency oscillation additional stabilizer；
(2), setting novel ultralow frequency vibrates the parameter of additional stabilizer；
(2.1), setting novel ultralow frequency vibrates the low pass branch parameter of additional stabilizer；
(2.1.1), setting band logical link transmission function are as follows:
Wherein, T is symmetrical bandpass link time constant, and s is the domain S operator；
Parameter in (2.1.2), setting band logical link；
According to band logical link centre frequencyThe amplitude at place is 1, and the parameter K in band logical link is arrangedL1With KL2
Are as follows:
According to transmission function G2(s) remaining parameter of band logical link is set；
Band logical link frequency f is setdWith the penalty coefficient R of band logical；
According to water turbine set operating condition, determine generate ultra-low frequency oscillation scene collection W, then to all scenes in scene collection by
One is recognized, and frequency of oscillation collection F is formed；
Wherein, wpIndicate p-th of scene of generation ultra-low frequency oscillation, fpIndicate ultra-low frequency oscillation frequency corresponding to p-th of scene
Frequency；
According to frequency of oscillation collection F, f is setdAnd R:
Wherein, fminWith fmaxFor the minimum value and maximum value of frequency in frequency of oscillation collection F, σ is frequency allowance, and B is pass band,
Bandpass filter bandwidth is made to be B by constantly regulate R value；
(2.2), setting novel ultralow frequency vibrates other link parameters of additional stabilizer
(2.2.1), the objective function of building meter and ultra-low frequency oscillation scene collection under various working situation；
Wherein, uiIt vibrates for novel ultralow frequency to setting parameter in additional stabilizer, U is its feasible zone, and W is scene collection, α (ui,
wi) it is in scene situation wiWhen, system is set as u to setting parameteriWhen, real part corresponding to ultra-low frequency oscillation mode, ξ 'min
(ui,wi) it is to damp minimum value, ξ in other oscillation modes other than ultra-low frequency oscillation mode0For given damping lower limit value；
(2.2.2), optimizing is iterated to above-mentioned objective function using particle swarm algorithm, final optimizing solves to obtain um, inside
Variable is each link setting parameter value of corresponding novel ultralow frequency oscillation additional stabilizer；
(3), novel ultralow frequency oscillation additional stabilizer is used in power grid, is vibrated in additional stabilizer by novel ultralow frequency
Low pass branch filters out ultra-low frequency oscillation signal, thus oscillation caused by inhibiting ultra-low frequency signal.
2. the method according to claim 1 for inhibiting ultra-low frequency oscillation based on novel ultralow frequency oscillation additional stabilizer,
It is characterized in that, the frequency allowance σ value is 0.1.
3. the method according to claim 1 for inhibiting ultra-low frequency oscillation based on novel ultralow frequency oscillation additional stabilizer,
It is characterized in that, the band logical penalty coefficient R can change its value size, to adjust the bandwidth of bandpass filter.
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| CN103956755A (en) * | 2014-04-23 | 2014-07-30 | 国家电网公司 | Design method for power system stabilizer capable of suppressing ultra-low frequency oscillation |
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| CN107465202A (en) * | 2017-08-28 | 2017-12-12 | 国网浙江省电力公司电力科学研究院 | A kind of PSS4B method for parameter configuration and system based on numerical model analysis emulation |
| CN107508295A (en) * | 2017-10-20 | 2017-12-22 | 华北电力大学 | A kind of PSS4B parameter regulation adaptive methods based on wide area measurement |
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| US20120183004A1 (en) * | 2010-12-13 | 2012-07-19 | Redfern Integrated Optics, Inc. | Ultra-Low Frequency-Noise Semiconductor Laser With Electronic Frequency Feedback Control and Homodyne Optical Phase Demodulation |
| CN103956755A (en) * | 2014-04-23 | 2014-07-30 | 国家电网公司 | Design method for power system stabilizer capable of suppressing ultra-low frequency oscillation |
| CN106786662A (en) * | 2016-11-15 | 2017-05-31 | 国家电网公司 | A kind of PSS4B parameter tuning methods based on Hybrid Particle Swarm Optimization |
| CN107465202A (en) * | 2017-08-28 | 2017-12-12 | 国网浙江省电力公司电力科学研究院 | A kind of PSS4B method for parameter configuration and system based on numerical model analysis emulation |
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