CN109672191A - The screening technique of large-scale wind power field collection region sub-synchronous oscillation risk - Google Patents
The screening technique of large-scale wind power field collection region sub-synchronous oscillation risk Download PDFInfo
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- 230000010355 oscillation Effects 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000012216 screening Methods 0.000 title claims abstract description 9
- 238000005516 engineering process Methods 0.000 abstract description 2
- 230000005611 electricity Effects 0.000 description 9
- 238000004088 simulation Methods 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 4
- 238000012502 risk assessment Methods 0.000 description 3
- 241000218978 Populus deltoides Species 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000010183 spectrum analysis Methods 0.000 description 2
- 101100499229 Mus musculus Dhrsx gene Proteins 0.000 description 1
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Classifications
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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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- 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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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Abstract
The invention belongs to wind power plant sub-synchronous oscillation assessment technology fields, more particularly to a kind of screening technique of large-scale wind power field collection region sub-synchronous oscillation risk, comprise determining that each wind farm grid-connected point in wind power plant collection region, and defining collection region to send route first section point outside is to collect station；Calculate single wind farm grid-connected capacity of short circuit and single wind field capacity；Calculating collects the total capacity of short circuit in station；Calculating collects the total fan capacity in station；Calculating collects station short-circuit ratio；According to the calculated result for collecting station short-circuit ratio, sub-synchronous oscillation risk zones are judged.It can be considered that the influence of the capacity difference of each wind power plant and collection region inside grid structure to station short-circuit ratio is collected in collection region, the sub-synchronous oscillation risk suitable for large-scale wind power field collection region are screened.
Description
Technical field
The invention belongs to wind power plant sub-synchronous oscillation assessment technology field more particularly to a kind of large-scale wind power field pooling zones
The screening technique of domain sub-synchronous oscillation risk.
Background technique
In recent years, as the installed capacity of generation of electricity by new energy rises year by year, a large amount of power electronic equipment accesses power train
Thus system introduces a series of new sub-synchronous oscillation problem, especially wind power plant and interacts and generate subsynchronous with power grid
Oscillation.The characteristics of due to China's energy and power load distributing, transprovincially trans-regional power Transmission has become China's transmission of electricity at a distance
One of the significant challenge that wire side faces, and grid entry point short-circuit ratio is reduced with the increase of Wind turbines grid connection capacity, forms weak friendship
Streaming system.Existing research shows that when large-scale wind power is sent into weak AC system outside the venue, it is likely that cause sub-synchronous oscillation wind
Danger.Therefore, assessment is carried out for the sub-synchronous oscillation risk of large-scale wind power field collection region to be of great significance.
Existing short-circuit ratio (short circuit ratio, SCR) index, by calculating single wind farm grid-connected point
AC system intensity measures sub-synchronous oscillation risk.However in real system, usually multiple wind power plants are connected to remittance simultaneously
Collection station forms large-scale wind power field collection region concentration and sends form outside.If existing short-circuit ratio calculation method is applied to big rule
Mould wind power plant collection region, then need to be considered as and collect station for wind power plants all in collection region and be connected directly, thus can not be anti-
The difference of each wind power plant capacity in region and the network structure inside collection region are reflected to collecting station AC system intensity
It influences, causes short-circuit ratio calculated result deviation larger, seriously affected the accuracy of sub-synchronous oscillation risk screening.
Summary of the invention
In view of the above technical problems, the present invention proposes a kind of sieve of large-scale wind power field collection region sub-synchronous oscillation risk
Choosing method, comprising:
Step 1: determining each wind farm grid-connected point in wind power plant collection region, and define collection region and send route first section outside
Point is to collect station；
Step 2: calculating single wind farm grid-connected capacity of short circuit and single wind field capacity；
Step 3: calculating collects the total capacity of short circuit in station；
Step 4: calculating collects the total fan capacity in station；
Step 5: calculating collects station short-circuit ratio；
Step 6: according to the calculated result for collecting station short-circuit ratio, judging sub-synchronous oscillation risk zones.
The station short-circuit ratio of collecting is the ratio for collecting the total capacity of short circuit in station with collecting total fan capacity of standing.
The standard of the judgement sub-synchronous oscillation risk zones are as follows: be then high risk zone when collecting station short-circuit ratio≤1；
It is then risky region when 1 < collects station short-circuit ratio≤3.
Beneficial effects of the present invention:
The invention proposes a kind of screening techniques of large-scale wind power field collection region sub-synchronous oscillation risk, it can be considered that
The influence of the capacity difference of each wind power plant and collection region inside grid structure to station short-circuit ratio is collected in collection region,
Sub-synchronous oscillation risk suitable for large-scale wind power field collection region is screened.
Detailed description of the invention
Fig. 1 is large-scale wind power field collection region topology elementary diagram.
Fig. 2 is 4 practical wind field grid structure figures in embodiment.
Fig. 3 is that each wind field collects line active power and result of spectrum analysis figure.
Specific embodiment
With reference to the accompanying drawing, it elaborates to embodiment.
The present invention proposes a kind of screening technique of large-scale wind power field collection region sub-synchronous oscillation risk, comprising:
1, each wind farm grid-connected point and collection bus in wind power plant collection region are determined
It is as shown in Figure 1 large-scale wind power collection region topology elementary diagram.Wherein, collection region sends route first section outside
B∑Point is to collect station；N wind power plant is shared in region, the boosted change Ti of i-th of wind power plant accesses AC system Bi, i=1,
2 ..., n.
With SGiIndicate i-th of wind power plant inner blower single-machine capacity；With miIndicate i-th of wind power plant inner blower number of units.
2, single wind farm grid-connected capacity of short circuit is calculated
Large-scale wind power field shown in FIG. 1 collection region includes n wind power plant, and single wind field capacity of short circuit of wind field i is
SCi, SiFor the total installation of generating capacity of wind field i, ISCiFor wind field BiThe short circuit current at place calculates each sub- wind according to formula (1)-(2)
The capacity of short circuit of field and single wind field capacity.
Si=miSGi (2)
3, it calculates and collects the total capacity of short circuit in station
To wind-powered electricity generation collection region shown in Fig. 1, calculating collects station B∑Total wind field capacity of short circuit, formula is as follows:
4, it calculates and collects the total fan capacity in station
Total fan capacity of wind-powered electricity generation collection region shown in Fig. 1 are as follows:
SB∑=S1+S2+S3+...+Sn (4)
5, it calculates and collects station short-circuit ratio
It is as follows that wind-powered electricity generation shown in FIG. 1 collects station short-circuit ratio formula:
6, sub-synchronous oscillation risk zones are determined
Foundation collects station short-circuit ratio SCRBΣCalculated result, judge sub-synchronous oscillation risk zones, judgment criteria are as follows:
Work as SCRBΣ≤ 1, then it is high risk zone； (6)
As 1 < SCRBΣ≤ 3, then it is risky region； (7)
Specific embodiment is as follows.Sub-synchronous oscillation methods of risk assessment of the present invention for large-scale wind power collection region has
Body the following steps are included:
1, practical wind power plant grid structure
With 4 real system examples, system sub-synchronous oscillation risk under different grid structures is verified, and collects station short circuit
Compare reporting situations for this affecting laws.The grid structure of 4 practical large-scale wind fields is illustrated in fig. 2 shown below.A wind field is Liao Ningjin
State factory atmosphere electric field, each sub- wind field is accessed in a manner of radial in wind field collects line；B wind field is Liaoning Long Kang wind power plant, in wind field
Each sub- wind field comes together in after same bus to concentrate and send outside；C wind field is Meng Dongwudan wind power plant, and D wind field is to cover eastern poplar wind power plant,
The grid structure of two wind power plants is mixed connection topological structure, is the typical topology of wind field.Each wind field blower number of units ni?
It is marked in figure, the electric parameter of each wind field is as shown in table 1-4.
1 Jinzhou, Liaoning factory atmosphere electric field actual parameter of table
| Route LLG-JZC impedance | Route QJ-JZC impedance | Route YD-JZC impedance | Route YX-JZC impedance |
| 0.00471+j0.02073p.u | 0.0014+j0.00713p.u | 0.00512+j0.01885p.u | (0.00376+j0.02147)/2p.u |
| Route JLT-LLK impedance | Route LLK-YX impedance | 1 leakage reactance of transformer | 2 leakage reactance of transformer |
| 0.00365+j0.0136p.u | 0.00428+j0.0213p.u | 0.0034p.u | 0.1275p.u |
| 3 leakage reactance of transformer | 4 leakage reactance of transformer | 5 leakage reactance of transformer | ISC1 |
| 0.1321p.u | 0.1382p.u | 0.1389p.u | 9.7271KA |
| ISC2 | ISC3 | ISC4 | ISC5 |
| 19.6137KA | 10.4442KA | 8.7673KA | 7.1973KA |
2 Liaoning Long Kang wind power plant actual parameter of table
| 1 leakage reactance of transformer | 2 leakage reactance of transformer | 3 leakage reactance of transformer | ISCi(i=1,2 ..., 6) |
| 0.05417p.u | 0.05417p.u | 0.133p.u | 8.0608KA |
3 Meng Dongwudan wind power plant actual parameter of table
Table 4 covers eastern poplar wind power plant actual parameter
| Route YS-WT impedance | Route YS-DS impedance | Route YS-XC impedance | Route YS-DY impedance |
| 0.00498+j0.01814p.u | 0.00386+j0.01674p.u | 0.0035+j0.1589p.u | 0.00381+j0.1731p.u |
| Route XC-DXC impedance | Route XC-MY impedance | Route DY-MDDY impedance | Route DY-QX impedance |
| 0.00021+j0.00095p.u | 0.00078+j0.00353p.u | 0.001+j0.00454p.u | 0.00145+j0.0066p.u |
| 1 leakage reactance of transformer | 2 leakage reactance of transformer | 3 leakage reactance of transformer | 4 leakage reactance of transformer |
| 0.1373p.u | 0.19921p.u | 0.10667p.u | 0.10858p.u |
| 5/6 leakage reactance of transformer | 7 leakage reactance of transformer | 8 leakage reactance of transformer | ISC1 |
| 0.10933p.u | 0.1273p.u | 0.1398p.u | 3.4424KA |
| ISCi(i=2,3.4) | ISC5=ISC6 | ISC7=ISC8 | |
| 3.5430KA | 9.4592KA | 3.6783KA |
When calculating each sub- wind field capacity of short circuit, UNIt is 220kV, separate unit fan capacity SGiIt is 1.5MW.
2, practical wind power plant is collected station short-circuit ratio and is calculated
The station short-circuit ratio calculated result of collecting of four practical wind power plants is counted with the conventional short circuit of line (JZC, LK, WD and YS) is collected
It is as shown in the table to calculate result:
5 two kinds of short-circuit ratio calculated result comparisons of table
| Wind field | A | B | C | D |
| Collect station short-circuit ratio | 1.875 | 4.5 | 1.47 | 0.99 |
| Original short-circuit ratio | 31.99 | 5.04 | 11.52 | 2.06 |
Short-circuit ratio is smaller, illustrates that system enabling capabilities are weaker, sub-synchronous oscillation risk is bigger.The method according to the invention,
According to station short-circuit ratio calculated result is collected, according to formula (6), (7) judgment criterion, the region D is high risk zone, and C and A are to have wind
Danger zone domain, and four practical wind power plant collection region sub-synchronous oscillation risks are ranked up result are as follows: D > C > A > B.And according to existing
The result for having short-circuit ratio calculation method to obtain carries out sub-synchronous oscillation risk ranking, obtains ranking results: D > B > C > A.
3, collect station short-circuit ratio screening technique validity simulating, verifying
The simulation model of four practical wind fields in PSCAD/EMTDC software carries out simulation analysis.The wind-powered electricity generation of four wind fields
Unit uses identical control system, is adjusted in synchronism the controller parameter of each wind field, active power waveform when wind field vibrates and
Result of spectrum analysis is illustrated in fig. 3 shown below.When simulation calculation, D wind field is vibrated first, oscillation amplitude 8.5MW；C wind field with
It vibrates afterwards, oscillation amplitude 1.1MW；A wind field finally vibrates, oscillation amplitude 0.7MW；And B wind field is not sent out always
Raw oscillation.The amplitude of subsynchronous frequency component, simulation calculation obtain when there is the sequence of sub-synchronous oscillation and oscillation according to wind field
To the wind-powered electricity generation sub-synchronous oscillation risk of each wind field are as follows: D > C > A > B.Simulation result with collect station short-circuit ratio calculated result phase one
It causes, demonstrates the effect for collecting station short-circuit ratio index in wind-powered electricity generation sub-synchronous oscillation risk analysis, show that wind-powered electricity generation of the present invention collects
Region sub-synchronous oscillation methods of risk assessment is effective.
This embodiment is merely preferred embodiments of the present invention, but scope of protection of the present invention is not limited thereto,
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with scope of protection of the claims
Subject to.
Claims (3)
1. a kind of screening technique of large-scale wind power field collection region sub-synchronous oscillation risk characterized by comprising
Step 1: determining each wind farm grid-connected point in wind power plant collection region, and define collection region and send route first section point outside and be
Collect station；
Step 2: calculating single wind farm grid-connected capacity of short circuit and single wind field capacity；
Step 3: calculating collects the total capacity of short circuit in station；
Step 4: calculating collects the total fan capacity in station；
Step 5: calculating collects station short-circuit ratio；
Step 6: according to the calculated result for collecting station short-circuit ratio, judging sub-synchronous oscillation risk zones.
2. method according to claim 1, which is characterized in that the station short-circuit ratio of collecting is to collect the total capacity of short circuit in station and converge
The ratio of the total fan capacity in collection station.
3. method according to claim 1 or claim 2, which is characterized in that the standard of the judgement sub-synchronous oscillation risk zones are as follows:
It is then high risk zone when collecting station short-circuit ratio≤1；It is then risky region when 1 < collects station short-circuit ratio≤3.
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| CN110707728A (en) * | 2019-09-09 | 2020-01-17 | 上海电力大学 | Subsynchronous oscillation suppression method based on subsynchronous oscillation short-circuit ratio index |
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