CN108270240A - A kind of subsynchronous source of marine wind electric field-net joint damping suppressing method - Google Patents
A kind of subsynchronous source of marine wind electric field-net joint damping suppressing method Download PDFInfo
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- H02J3/386—
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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
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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
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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Abstract
A kind of subsynchronous source net joint the present invention relates to marine wind electric field damps suppressing method, including：S1 is built based on linearized state-space model of the marine wind electric field of double-fed fan motor unit through VSC HVDC grid-connected systems；S2, the sub-synchronous oscillation mode of identification system；S3 is calculated by model analysis and participates in the factor, filters out the state variable for participating in each sub-synchronous oscillation mode strong correlation；S4 utilizes influence of the root-locus technique analysis strong correlation state variable to sub-synchronous oscillation modal damping；S5, according to root locus analysis as a result, the parameter of design DFIG_SEDC and VSC_SSDC, reduces influencing each other between each sub-synchronous oscillation mode, inhibit multiple sub-synchronous oscillation mode.Compared with prior art, the present invention solves the cost problem for installing FACTS devices additional, the source net joint damping controller of design can inhibit multiple sub-synchronous oscillation mode simultaneously, improve the subsynchronous stability of system, ensure the safe and stable operation that new energy electric power is sent out.
Description
Technical field
The present invention relates to a kind of marine wind electric field damping control method, more particularly, to a kind of the subsynchronous of marine wind electric field
Source-net joint damping suppressing method.
Background technology
In recent years, wind-powered electricity generation is as a kind of reproducible clean energy resource, many because its cost of electricity-generating is low, resource reserve enriches etc.
Advantage is rapidly developed, and especially offshore wind farm accounting increases swift and violent, wide market.With marine wind electric field scale and
The increase of grid-connected transmission distance, traditional ac transmission show various drawbacks, and the D.C. high voltage transmission based on voltage-source type
(VSC-HVDC) have can the active and reactive power transmitted of independent control and many merits such as power to passive network,
It is to realize that extensive marine wind electric field power sends ideal transmission tariff outside at present, but at the same time also bring many
Problem.Wherein, first point be marine wind electric field through VSC-HVDC it is grid-connected when, the meeting of VSC-HVDC control devices and double-fed fan motor unit
Frequency changer controller generates reciprocation, makes system that underdamping or negative damping be presented, causes a kind of novel sub-synchronous oscillation
Problem --- subsynchronous device interacts (sub-synchronous equipments interaction, SSEI).Second
Point：Since offshore wind farm unit uses relatively large wind turbine that shafting coefficient of elasticity is caused to increase for comparing inland wind turbine
Greatly, the natural torsion frequency for causing shafting is higher, in wind speed disturbance or electric network fault, wind turbine shafting will be caused to occur subsynchronous
Torsional oscillation (sub-synchronous torsional interaction, SSTI) risk, shafting torsional oscillation will seriously affect
The service life of each component of shafting or even there is bearing breaking, cause to shut down for a long time.Thirdly：It is popular at present
The measure for inhibiting sub-synchronous oscillation is to install FACTs equipment additional, but uses FACTs equipment costs costliness, takes up a large area, and will be increased
The cost of investment of system also has document to propose to install damping controller additional to inhibit sub-synchronous oscillation, but the research done at present is big
It is only focus on a certain subsynchronous problem more, for certain sub-synchronous oscillation new problems, in mechanism of production, influence index and inhibition
It need to be furtherd investigate in method.It is therefore, it is necessary to new through the grid-connected caused sub-synchronous oscillations of VSC-HVDC to marine wind electric field
Problem expansion is further analyzed, and is considered from source net both sides, is proposed a kind of new combination control method, can be to grid-connected system
The a variety of subsynchronous phenomenons occurred in system are effectively inhibited, and are prevented due to large area wind turbine off-grid caused by sub-synchronous oscillation
Or the generation of equipment fault phenomenon, it is ensured that the safe and stable operation of system.
Invention content
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of marine wind electric fields
Subsynchronous source-net joint damping suppressing method, i.e. design can effectively inhibit marine wind electric field grid-connected caused through VSC-HVDC
The joint damping controller of sub-synchronous oscillation new problem, while inhibit multiple Oscillatory mode shapes, the damping of system is improved, is ensureing system
It unites in the case of subsynchronous stability and inhibition, reduces cost of investment as far as possible.
The purpose of the present invention can be achieved through the following technical solutions：
S1 builds the linearisation state space through VSC-HVDC grid-connected systems based on the marine wind electric field of double-fed fan motor unit
Model；
S2 asks for the steady stability operating point of the model, carries out Eigenvalues analysis in steady stability operating point, asks for mould
Each sub-synchronous oscillation frequency f of typec, left eigenvector, right feature vector and damping ratio ξ, further identification system it is potentially secondary
Synchronized oscillation mode；
S3 using the characteristic attribute of each pair of conjugate character root, carries out model analysis respectively, asks for participating in the factor, filter out
Participate in the state variable of each sub-synchronous oscillation mode strong correlation；
S4 changes the value of the state variable of strong correlation, obtains mode root locus plot, is analyzed using root-locus technique above-mentioned
Influence of the strong correlation state variable to sub-synchronous oscillation modal damping；
S5, the strong correlation state variable obtained according to model analysis, respectively in dual-feed asynchronous wind power generator DFIG sides and
VSC-HVDC sides install appended with field excitation damp controller DFIG_SEDC and Subsynchronous Damping Controller VSC_SSDC additional, according to root rail
Mark analysis result designs the parameter of DFIG_SEDC and VSC_SSDC, reduces influencing each other between each sub-synchronous oscillation mode, together
When inhibit multiple sub-synchronous oscillation mode；
The steady stability operating point of model is asked in the step S2 using the first method of Liapunov；
The step S3 is specially：Calculate the participation factor of sub-synchronous oscillation patternAnd
The 0.2 corresponding state variable of the participation factor be will be greater than as the state variable with sub-synchronous oscillation pattern strong correlation, it is described
Participate in factor plkRepresent degree of participation of l-th of state variable to k-th of pattern, wherein, u, v represent respectively left eigenvector and
Right feature vector；N represents the sum of state variable；
In the step S4, the strong correlation state variable that step S3 is obtained is handled, chooses one of them respectively
As observation variable, the unique step value in its suitable range, remaining strong correlation state variable remains unchanged, and obtains each
Mode corresponds to the root locus of different strong correlation state variables；
In the step S5, realized using the time domain based on complex torque coefficients -- signal testing method is individually adjusted
The filtering of DFIG_SEDC and VSC_SSDC, phase compensation, gain and amplitude limit link parameter, so as to respectively different frequency range
Sub-synchronous oscillation provides suitable damping.Wherein, it is normal to include blocking filtering link time for the parameter of DFIG_SEDC and VSC_SSDC
Number TW, phase compensation link lead-lag time constant T1、T2And gain link Proportional coefficient K.
The time domain of above-mentioned complex torque coefficients is realized -- signal testing method specific steps include：When system enters stable state
Afterwards, apply multiple frequencies on fan rotor into the small-signal pulsating torque of integral multiple, after system is stablized again, interception pulsation turns
Wind turbine electromagnetic torque T on one common period of squareeFourier decomposition is carried out with fan rotor rotation speed signal ω, obtains difference
Wind turbine electromagnetic torque variable quantity and rotor speed variable quantity under frequencyWithThen computing system is in difference
Electrical damping coefficient D under frequency disturbancee(f) and electromagnetic torque variation delta TeThe lagging phase for comparing rotating speed deviation delta ω is poorAccording to De(f) positive and negative judge whether VSC-HVDC can interact with marine double-fed fan motor unit and generate sub-synchronous oscillation,
And the initial value of DFIG_SEDC and VSC_SSDC are calculated according to the following formula.
Wherein, a be middle transition amount, T1、T2For the phase compensation link time constant of DFIG_SEDC and VSC_SSDC, fc
For a certain sub-synchronous oscillation frequency of system.
The frequency range of the small-signal pulsating torque is 5-45Hz, amplitude 0.05p.u..
Compared with prior art, the present invention is directed to current marine wind electric field through the grid-connected caused sub-synchronous oscillations of VSC-HVDC
New problem is analysed in depth, and a kind of new joint damping controller suppressing method is proposed, respectively by DFIG sides and VSC-
HVDC sides install appended with field excitation damp controller (DFIG_SEDC) additional and Subsynchronous Damping Controller (VSC_SSDC) respectively shakes to reduce
Influencing each other between mode is swung, so as to combine the generation for inhibiting multi-modal sub-synchronous oscillation phenomenon.
The embodiment of the present invention builds sub-synchronous oscillation on DIgSILENT/PowerFactory wind-electricity integration emulation platforms
Primal system electro-magnetic transient time domain simulation model is realized using the time domain of complex torque coefficients --- signal testing method is individually adjusted
The filtering of DFIG_SEDC and VSC_SSDC, phase compensation, gain and amplitude limit link parameter, carry out source-net joint damping control
Device inhibits sub-synchronous oscillation test, demonstrates the accuracy of put forward control method.The control method that is carried of the present invention is from source net two
Side considers, and can inhibit multiple Oscillatory mode shapes simultaneously, full-featured, has not only improved the subsynchronous stability of system, but also
It can guarantee the safe operation that new energy electric power is sent out.In addition, the investment of DFIG_SEDC and VSC_SSDC is small, floor space is few, fortune
Row is easy to maintain, the problems such as also solving and inhibited at present using external FACTs equipment, increase the cost of investment of system.
Description of the drawings
Fig. 1 is participation Effects of Factors distribution map, wherein, Fig. 1 (a) is SSEI patterns, and Fig. 1 (b) is SSTI patterns；
The root locus of each oscillation mode when Fig. 2 is rotor-side frequency converter open sea wharf Parameters variation, wherein, Fig. 2 (a)
For SSEI patterns, Fig. 2 (b) is SSTI patterns；
Fig. 3 is the root locus of each oscillation mode when rotor-side frequency converter inner ring current control parameter changes, wherein, Fig. 3 (a)
For SSEI patterns, Fig. 3 (b) is SSTI patterns；
Fig. 4 is wind speed round ωtThe root locus of each oscillation mode during variation；
Fig. 5 is the DFIG rotor-side control block diagrams of additional longitudinal forces；
Fig. 6 is that control block diagram is surveyed in the VSC-HVDC rectifications of additional longitudinal forces；
Fig. 7 is electrical damping coefficient curve；
Fig. 8 is Δ TeWith the phase-frequency characteristic curve of Δ ω；
Fig. 9 is when marine fluctuations in wind speed, does not use using damping control and damping control wind power plant active power of output
Dynamic response；
Figure 10 is when three-phase shortcircuit occurs on the busbar for connecting AC network, using damping control and not using damping control
Wind power plant active power of output dynamic response processed；
Figure 11 is the method for the present invention flow chart.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.The present embodiment is with technical solution of the present invention
Premised on implemented, give detailed embodiment and specific operating process, but protection scope of the present invention is not limited to
Following embodiments.
Embodiment
A kind of marine wind electric field combines damping controller design method through subsynchronous source grid-connected VSC-HVDC-net, it is wrapped
Include following step：
(1) system line for being connected to infinite bulk power grid through VSC-HVDC based on the marine wind electric field of double-fed fan motor unit is built
Property state-space model.
(2) the steady stability operating point of linearized system model is acquired using the first method of Liapunov, by static state
Stable operating point carries out each sub-synchronous oscillation frequency f that Eigenvalues analysis asks for the linearized system modelc, left/right feature
Vector and damping ratio ξ, the further potential sub-synchronous oscillation mode of identification system.
(3) to i-th pair conjugate character root λi=σi±jωi, mode is carried out using characteristic attributes such as its left and right feature vectors
Analysis is asked for participating in the factor, filters out the state variable for participating in each sub-synchronous oscillation mode strong correlation.
(4) change the value of state variable, obtain each mode root locus plot under strong correlation state variable parameter change,
Influence of the system relevant parameter to sub-synchronous oscillation modal damping is further studied using root-locus technique, conclusion can be sea
Wind power plant inhibits research to provide reference through sub-synchronous oscillation grid-connected VSC-HVDC.
(5) the strong correlation state variable obtained according to model analysis installs additional additional in DFIG sides and VSC-HVDC sides respectively
Excitation Damping controller (DFIG_SEDC) and Subsynchronous Damping Controller (VSC_SSDC) reduce mutual between each Oscillatory mode shape
It influences, while inhibits multiple sub-synchronous oscillation mode；Time domain based on complex torque coefficients is realized --- signal testing method is independent
The parameter of the filtering of DFIG_SEDC and VSC_SSDC, phase compensation, gain and amplitude limit link is adjusted, so as to respectively different frequencies
The sub-synchronous oscillation of section provides suitable damping.
The shafting nature torsion frequency of marine double-fed fan motor unit
When double-fed wind turbine selects two mass models, shafting nature frequency of oscillation fTObtained by formula (1), in formula, HtWith
HgWind turbine inertia coeffeicent and generator inertia coeffeicent, ω are represented respectively0Represent generator synchronous rotational speed, KsRepresent the firm of shafting
Spend coefficient.
In view of offshore wind farm unit using relatively large wind turbine, blade is bigger than normal, therefore elasticity system between shafting mass
Number is compared traditional inland wind turbine and be increased.When system line by frequency be feCurrent perturbation Δ isubWhen, double-fed wind-force hair
It is f that motor stator side, which will generate frequency,0–feSubsynchronous current component Δ ids_subWith Δ iqs_sub, the subsynchronous frequency component
An electric current part establishes the rotating excitation field of subsynchronous frequency in generator, and then induces frequency as f in rotor-side0–feIt is secondary same
Walk electric current Δ i ' idr_subWith Δ i 'qr_sub, another part can then cause the fluctuation of voltage on line side and electric current on d, q axis, generate
Δudg_sub、Δuqg_subWith Δ idg_sub、Δiqg_sub。Δudg_sub、Δuqg_subWith Δ idg_sub、Δiqg_subAs DFIG frequency conversions
The input quantity of device control system has an impact rotor-side frequency converter control system, and then acts on the rotor of generator again
Winding generates new sub-synchronous oscillation electric current, superimposed with the subsynchronous electric current that directly senses in rotor windings before, finally
It is f to form frequency in rotor-side0–feSubsynchronous current component Δ idr_subWith Δ iqr_sub, while frequency will also be caused to be f0–
feAlternating electromagnetism torque, if the frequency of the alternate torque is close with the intrinsic torsion frequency of the shafting of doubly-fed wind turbine,
Strong shafting torsional oscillation phenomenon, i.e. SSTI will just be caused.
Described in step 3 for i-th pair Con-eigenvalue λi=σi±jωi, according to participation factor Pki=UkiVki, mould
Value | Pki| size represent degree of participation of k-th of state variable to i-th of oscillation mode.(UkiAnd VkiRepresent respectively about
Eigenvalue λiLeft and right feature vector k-th of element) according to correlation ratio(x1,
x2,…,xrRepresentative and λiRelevant state variable) oscillation mode λ can be analyzediWith the correlation of strong correlation state variable, so as to
Judge Oscillatory mode shape type.
Time domain realization-test signal method of complex torque coefficients described in step 5, is as follows：When system into
After entering stable state, apply a series of frequencies on fan rotor into the small-signal pulsating torque Δ T of integral multiplemIt (is disturbed comprising different
Dynamic frequency, frequency range 5-45Hz), amplitude 0.05p.u., after system is stablized again, interception pulsating torque one is public
Wind turbine electromagnetic torque T on periodeFourier decomposition is carried out with fan rotor rotation speed signal ω, is obtained under different frequencyWithThen, electrical damping coefficient D of the system under different frequency disturbance is calculated according to formula (2)e(f)
And lagging phase is poorPass through system electrical damped coefficient D firsteIt is positive and negative, judge whether VSC-HVDC can be with marine double-fed wind
The interaction of motor group generates sub-synchronous oscillation；Meanwhile obtain generator electromagnetic torque variation delta TeCompare rotating speed deviation delta
The delayed phase relationship of ω provides theoretical reference according to collaboration damping controller parameter setting of the formula (3) for next step.
The present invention has been built in wind-electricity integration simulation software DIgSILENT/Power Factory comprising marine double-fed wind
Electric field and VSC-HVDC grid-connected systems have write DPL sentences and have established additional longitudinal forces DSL modules.By in source/net both sides point
Not She Zhiliao fluctuations in wind speed and three-phase shortcircuit both typical fault types, with it is traditional be not added with damping control compared with, with this
To verify the validity and accuracy of subsynchronous source proposed by the invention-net joint damping controller method.
Example 1：Marine sub-synchronous oscillation of the double-fed fan motor field through VSC-HVDC grid-connected systems
It is grid-connected through VSC-HVDC that the marine wind electric field containing double-fed fan motor unit is built using small-signal modeling analytic approach first
System small-signal model asks for the oscillation characteristics of characteristic root post analysis system sub-synchronous oscillation pattern using method of characteristic, according to
The analysis of table 1 can obtain：σ ± j ω are characterized root, the size of characteristic root real part Damping, real part be located at Left half-plane and further away from
The imaginary axis shows that system stability is stronger；Imaginary part of eigenvalues characterizes system oscillation frequency, can get Ge Mo by the π of calculation formula f=ω/2
The frequency of oscillation of formula；ξ is damping ratio, and value is bigger, and characterization dynamic attenuation characteristic is better.The marine double-fed wind turbine of analysis is through VSC-
The subsynchronous stability of HVDC and oscillation mode off the net, usually concern is primarily with the frequency of oscillation of imaginary part of eigenvalues and dampings
The value of ratio.As damping ratio ξ<0.1, the risk that sub-synchronous oscillation occurs is higher, and stability is inadequate.
1 marine wind electric field of table is through VSC-HVDC grid-connected system dominant oscillating modes
| Pattern | Characteristic value σ ± j ω | Modal frequency f/Hz | Damping ratio ξ/% |
| 1(λ1,λ2) | -2.35±j88.57 | 14.10 | 0.03 |
| 2(λ3,λ4) | -1.80±j36.21 | 5.76 | 0.05 |
| 3(λ5,λ6) | -17.17±j7.76 | 1.24 | 0.91 |
| 4(λ7,λ8) | -6.73±j1.10 | 0.17 | 0.99 |
| 5(λ9,λ10) | -48.15±j296.67 | 47.22 | 0.16 |
| 6(λ11,λ12) | -72.48±j121.09 | 19.27 | 0.51 |
| 7(λ13,λ14) | -229.67±j374.85 | 59.66 | 0.52 |
2 offshore wind farm shaft system of unit mechanical parameter of table
| Wind turbine shafting parameter | Ht/s | Hg/s | Ks/pu |
| Numerical value | 4.20 | 0.76 | 5 |
According to characteristic root table 1：The frequency of oscillation of pattern 2 is 5.76Hz, with according to system shafting mechanical parameter table 2 and
The wind turbine nature torsion frequency 5.56Hz that formula (1) is calculated is approached, therefore the subsynchronous shafting torsional oscillation pattern of correspondence system,
That is SSTI；The frequency of oscillation of pattern 1,5,6 is respectively 14.10Hz, 47.22Hz and 19.27Hz, belongs to sub-synchronous oscillation model
It encloses, but the real part of pattern 5,6 deviates the imaginary axis farther out, damping ratio ξ>0.1, therefore dynamic stability degree is preferable, meets stable operation
Requirement.And the real part deviation imaginary axis of pattern 1 is nearer, and damping ratio ξ<0.1, the risk that sub-synchronous oscillation occurs is higher, therefore,
It is unstable sub-synchronous oscillation pattern.
The participation factor (listing strong correlation state variable participation value) of 3 sub-synchronous oscillation pattern of table
Table 3 lists the participation factor values with 7 state variables of 1 and 2 strong correlation of pattern, corresponding to remaining state variable
The participation factor be zero, wherein, Δ ωtFor wind turbine wind speed round variable quantity, Δ x1、Δx2Respectively rotor-side frequency converter is active
Power inner and outer rings state of a control variable, Δ x5For loop voltag state of a control variable, Δ Q outside net side frequency converterwFor wind farm side
Real power component, Δ Usd1For rectification side ac bus voltage variety, Δ x10For the idle exterior ring power control of rectification side current conversion station
State variable processed.According to factor table 3 is participated in：Pattern 1 and Δ x1、Δx2With Δ QwStrong correlation；Pattern 2 and Δ ωtWith Δ x2
Strong correlation, Fig. 1 are the respective participation factor distribution map of two kinds of oscillation modes.Calculating pattern 1 is about Δ x1, Δ x2, Δ x5With Δ x10
Correlation ratio obtain：ρi=1.007 >=1；It calculates about (meaning please be supplement) Δ ωtCorrelation ratio obtain：ρi=0.115 ＜ 1, explanation
Participation pattern 1 mainly with wind turbine and the relevant state variable of VSC-HVDC frequency changer controllers, Axial Status variable is not
It participates in.Therefore, it is possible to judge that the subsynchronous device Interactions Mode of 1 correspondence system of pattern, i.e. SSEI.
From the root locus variation tendency of Fig. 2-4：Inner ring current control Proportional coefficient K in rotor-side frequency converterp2And product
Divide COEFFICIENT Ki2It is larger to the influence degree of system oscillation mode damping level, and with Proportional coefficient Kp2Increase, system deposits
In the risk for negative damping occur.In addition, ωtChange be affected to SSTI patterns, and the influence to SSEI patterns is smaller.
Work as ωtDuring by reducing greatly, the characteristic root of SSTI is moved to the imaginary axis, and positive damping reduces, and system stability weakens.Illustrate, wind wheel turns
Speed pair has an impact with the relevant torsional mode of wind turbine shafting, and other oscillation modes are not influenced.
Example 2：Installation source-net joint damping controller inhibits sub-synchronous oscillation
According to the factor is participated in：In wind farm side, the mainly Δ ω of oscillation is influencedt、Δx1With Δ x2；And in VSC-
HVDC sides influence the mainly Δ Q of oscillationwWith Δ x10.Therefore, prime selected site is carried out by strong correlation state variable, selected respectively
Implement damping control in DFIG excitation units and VSC converting plants, as shown in Figure 5,6.DFIG_SEDC is by adjusting wind turbine excitation electricity
Signal is pressed, generates additional electromagnetic torque Δ TSEDC, to inhibit the shafting torsional oscillation of mains side.VSC_SSDC is by adjusting VSC rectifications
The idle reference signal of side outer shroud constant dc power control generates additional electromagnetic torque Δ TSSDC, to inhibit the secondary Δ ω of grid side same
Step oscillation.ΔTSEDCWith Δ TSSDCWith former electromagnetic torque Δ TeSynthesis can obtain new Δ Te' so that Δ Te' and phase difference it is extensive
Within multiple to 0 °~90 °, i.e., a positive electrical damping is provided to system, to inhibit the generation of sub-synchronous oscillation.
Table 4 combines damping controller DFIG_SEDC and VSC_SSDC parameters
According to the electrical damping coefficient curve as shown in Figure 7 that signal testing method obtains：In wind turbine shafting nature torsional oscillation frequency
Under rate (f=5.76Hz) and system sub-synchronous oscillation frequency (f=14.10Hz), system electrical damped coefficient DeBe it is negative, therefore,
When system is by mechanical damping deficiency or disturbance, there is the risk that SSTI and SSEI occurs.According to the lagging phase characteristic of Fig. 8
It understands：Lagging phase at 14.10Hz and 5.76Hz is respectively 105 ° and 159 °.The initial value of damping controller is surveyed by signal
Examination method determines, according to formula (3), the value of DFIG_SEDC and VSC_SSDC controllers is calculated, as a result such as table 4.Selection is typical
The method of operation Eigenvalues analysis, the suppression of verification joint damping controller DFIG_SEDC and VSC_SSDC are carried out to power grid again
Effect processed, the results are shown in Table 5.
Table 5 is added in the case of different damping controller, the corresponding characteristic value of modal frequency
Analysis is understood：When being free of DFIG_SEDC and VSC_SSDC in system, though the real part of characteristic root is all negative, partially
Closer to the distance from the imaginary axis, the stability of system is poor；When being individually added into DFIG_SEDC or VSC_SSDC, characteristic root away from the imaginary axis away from
From increased, the stability of system obtains a degree of raising；When adding in DFIG_SEDC and VSC_SSDC simultaneously, system
Two Oscillatory mode shape characteristic root real parts are obviously reduced, and apart from the imaginary axis farther out, the stability of system is significantly improved.
Example 3：Wind speed changes and the rejection characteristic emulation under the system failure
In order to further analyze reference source-net collaboration additional damping controller DFIG_SEDC and VSC_SSDC to system time
The inhibition of synchronized oscillation tests system using the time-domain-simulation built, and wind power plant exports in the case of studying different faults
The dynamic change response of active power.
Wind speed changes
The initial wind speed for setting marine wind electric field is 11m/s, applies big wind speed disturbance in 1.25s, continues 0.25s, right
Entire marine wind electric field occurs sub-synchronous oscillation phenomenon through VSC-HVDC grid-connected systems and is studied.Fig. 9 is adds in joint damping
Before and after control, the domain simulation eur of wind power plant active power of output.
Found out by Fig. 9：When undamped controls in system, the variation of wind power plant active power of output is essentially self-sustained oscillation,
Attenuation is slow；Compared with not using damping control, there is a degree of inhibition when being individually added into DFIG_SEDC or VSC_SSDC
Effect.When adding in DFIG_SEDC and VSC_SSDC simultaneously, wind power plant active power of output can reach stable within the shortest time,
The risk that SSEI and SSTI occurs for system is significantly reduced, meanwhile, it also demonstrates when mains side disturbs, using collaboration damping
Controller can significantly improve the stability of system.
The system failure
It when being arranged on 1.25s, connects and three-phase shortcircuit occurs on the busbar of AC network, failure is removed after continuing 0.25s, figure
Before and after 10 is add in damping control, the change curve of wind power plant active power of output.
Found out by Figure 10：When undamped controls in system, wind power plant active power of output variation fluctuation amplitude is larger, attenuation
It is relatively slow；When individually using DFIG_SEDC or VSC_SSDC, active power of output convergence rate is accelerated；Add in DFIG_ simultaneously
During SEDC and VSC_SSDC, the active power of output rate of decay is significantly accelerated, consistent with Eigenvalues analysis result before.Together
When, it demonstrates when grid side breaks down, using the stability that damping controller is cooperateed with also preferably to improve system, inhibition is secondary
The generation of synchronized oscillation.
Therefore, the marine integrated wind plant of the wind turbine containing double-fed is adding in the source of method designed by the present invention-net joint damping
After controller, characteristic root is moved to the direction far from the imaginary axis, and the oscillation amplitude rate of decay is accelerated, it is evident that source-net connection
The installation for closing damping controller improves offshore wind farm system through novel sub-synchronous oscillation stability grid-connected VSC-HVDC, is protecting
Under the premise of demonstrate,proving SSTI and SSEI inhibitions, reduce equipment investment cost.
Claims (8)
1. a kind of subsynchronous source of marine wind electric field-net joint damping suppressing method, the marine wind electric field is through voltage-source type
D.C. high voltage transmission VSC-HVDC be connected to infinite bulk power grid, which is characterized in that the method includes the following steps：
S1 is built based on linearisation state space mould of the marine wind electric field of double-fed fan motor unit through VSC-HVDC grid-connected systems
Type；
S2 acquires the characteristic root of state matrix in step S1, the sub-synchronous oscillation mode of identification system；
S3 using the characteristic attribute of each pair of conjugate character root, carries out model analysis respectively, asks for participating in the factor, filters out participation
The state variable of each sub-synchronous oscillation mode strong correlation；
S4 changes the value of strong correlation state variable, obtains mode root locus plot, and the strong correlation is analyzed using root-locus technique
Influence of the state variable to sub-synchronous oscillation modal damping；
S5, the strong correlation state variable obtained according to model analysis, respectively in dual-feed asynchronous wind power generator DFIG sides and VSC-
HVDC sides install appended with field excitation damp controller DFIG_SEDC and Subsynchronous Damping Controller VSC_SSDC additional, according to root locus point
Analysis reduces influencing each other between each sub-synchronous oscillation mode, presses down simultaneously as a result, the parameter of design DFIG_SEDC and VSC_SSDC
Make multiple sub-synchronous oscillation mode.
2. a kind of subsynchronous source of marine wind electric field according to claim 1-net joint damping suppressing method, feature exist
In, in the step S2, the steady stability operating point of model is asked for using the first method of Liapunov, steady stability work
Point carries out Eigenvalues analysis, asks for each sub-synchronous oscillation frequency f of modelc, left eigenvector, right feature vector and damping ratio ξ,
So as to the potential sub-synchronous oscillation mode of further identification system.
3. a kind of subsynchronous source of marine wind electric field according to claim 1-net joint damping suppressing method, feature exist
In the step S3 is specially：Calculate the participation factor of sub-synchronous oscillation patternAnd it will be greater than
The 0.2 corresponding state variable of the participation factor as the state variable with sub-synchronous oscillation pattern strong correlation, wherein, the ginseng
With factor plkRepresent degree of participation of l-th of state variable to k-th of pattern, u, v represent left eigenvector and right feature respectively
Vector, n represent the sum of state variable.
4. a kind of subsynchronous source of marine wind electric field according to claim 1-net joint damping suppressing method, feature exist
In in the step S4, the strong correlation state variable that step S3 is obtained is handled, is chosen respectively one of as seeing
Variable is examined, the unique step value in its suitable range, remaining strong correlation state variable remains unchanged, and obtains each mode pair
Answer the root locus of different strong correlation state variables.
5. a kind of subsynchronous source of marine wind electric field according to claim 1-net joint damping suppressing method, feature exist
In, in the step S5, using based on complex torque coefficients time domain realize -- signal testing method individually adjusts DFIG_SEDC
The parameter of filtering, phase compensation, gain and amplitude limit link with VSC_SSDC, thus the respectively sub-synchronous oscillation of different frequency range
Suitable damping is provided.
6. a kind of subsynchronous source of marine wind electric field according to claim 5-net joint damping suppressing method, feature exist
In in the step S5, the parameter of DFIG_SEDC and VSC_SSDC include blocking filtering link time constant TW, phase mend
Repay link leading time constant T1, phase compensation link lag time constant T2And gain link Proportional coefficient K.
7. a kind of subsynchronous source of marine wind electric field according to claim 5-net joint damping suppressing method, feature exist
In the time domain of the complex torque coefficients is realized -- signal testing method specific steps include：After system enters stable state, in wind
Apply multiple frequencies on machine rotor into the small-signal pulsating torque of integral multiple, after system is stablized again, intercept pulsating torque one
Wind turbine electromagnetic torque T on common periodeFourier decomposition is carried out with fan rotor rotation speed signal ω, is obtained under different frequency
Wind turbine electromagnetic torque variable quantity and rotor speed variable quantityWithThen computing system is disturbed in different frequency
Electrical damping coefficient D under dynamice(f) and electromagnetic torque variation delta TeThe lagging phase for comparing rotating speed deviation delta ω is poorAccording to
De(f) positive and negative judge whether VSC-HVDC can interact with marine double-fed fan motor unit and generate sub-synchronous oscillation, and according to
The initial value of DFIG_SEDC and VSC_SSDC is calculated in following formula：
Wherein, a be middle transition amount, T1、T2For the phase compensation link time constant of DFIG_SEDC and VSC_SSDC, fcTo be
The synchronized oscillation frequency of system model.
8. a kind of subsynchronous source of marine wind electric field according to claim 7-net joint damping suppressing method, feature exist
In the frequency range of the small-signal pulsating torque is 5-45Hz, amplitude 0.05p.u..
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