CN104578161A - Wind power plant low-voltage ride-through ability evaluation method based on WAMS data - Google Patents
Wind power plant low-voltage ride-through ability evaluation method based on WAMS data Download PDFInfo
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- 238000011156 evaluation Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 claims abstract description 7
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- 230000001737 promoting effect Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 7
- 238000012544 monitoring process Methods 0.000 description 4
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- 238000003556 assay Methods 0.000 description 1
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Classifications
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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
- 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
Abstract
The invention provides a wind power plant low-voltage ride-through ability evaluation method based on WAMS data. The method includes the following steps that wind turbine generator off-network time under different grid connection point voltage drop levels is calculated; the low-voltage ride-through ability of a wind turbine generator is analyzed; the low-voltage ride-through ability of a wind power plant is evaluated. Through the method, the low-voltage ride-through ability of the wind power plant can be monitored and evaluated, and technical references and bases can be provided for promoting the low-voltage ride-through performance of the wind power plant.
Description
Technical field
The present invention relates to a kind of evaluation method, be specifically related to a kind of wind energy turbine set low voltage ride-through capability evaluation method based on WAMS data.
Background technology
More and more higher along with the ratio shared in electrical network of installed capacity of wind-driven power, its on the impact of electrical network by very important.When grid collapses causes wind farm grid-connected Voltage Drop, a series of transient processes of appearance such as overvoltage, overcurrent etc. can the safe operations of serious harm Wind turbines itself and control system thereof.If generally electrical grid failure Wind turbines just implements passive type self-protection and off-the-line immediately, do not consider duration and the order of severity of fault, the safety of Wind turbines can be ensured so to greatest extent.When the electrical network penetrance of wind power generation is lower, Wind turbines self-protection is exited is acceptable; and when wind-powered electricity generation occupies larger specific gravity in electrical network; if Wind turbines still takes passive protection formula off-the-line when Voltage Drop, the recovery difficulty of whole system can be increased; even may aggravate fault, finally cause the whole off-the-line of other unit of system.According to correlation technique regulation, when grid-connected point voltage falls, Wind turbines should possess the ability of " passing through " this low-voltage time (region), i.e. low voltage ride-through capability of wind turbine generator system.
According to wind-electricity integration actual conditions, the Wind turbines that part is incorporated into the power networks does not possess low voltage ride-through capability, and fails between age at failure effectively to provide dynamic reactive to support, and is the one of the main reasons causing the extensive off-grid of wind-powered electricity generation.When wind energy turbine set does not possess low voltage ride-through capability, when electric power system generation disturbance fault causes a large amount of Wind turbines cut, can there is serious transfer in system load flow, line voltage and frequency are all affected, and is unfavorable for the stable operation of system.Wind turbines off-grid not only can bring great risk to power network safety operation and reliable power supply, and wind energy turbine set owner may be made to suffer very large loss.
Therefore, the low voltage ride-through capability of Wind turbines is the important indicator weighing wind field safety in operation.For maintaining the safe and stable operation of electric power system and ensureing wind farm grid-connected safety, whether evaluation analysis low voltage ride-through capability of wind turbine generator system meets the demands, and does not meet Wind turbines that " low wear " require to supervising to carry out rectification significant.Along with the extensive use of WAMS (WAMS), it is that the assay of low voltage ride-through capability of wind turbine generator system provides data qualification.How to utilize PMU Monitoring Data real-time in a large number, by setting up low voltage ride-through capability of wind turbine generator system evaluation model, realizing the rational evaluation to low voltage ride-through capability of wind turbine generator system, is ensure the safe and stable operation of electric power system and wind farm grid-connected safe important foundation.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the invention provides a kind of wind energy turbine set low voltage ride-through capability evaluation method based on WAMS data, realize wind energy turbine set low voltage ride-through capability monitoring and evaluation, can for promoting that the low performance of wearing of wind energy turbine set provides Technical Reference and foundation.
In order to realize foregoing invention object, the present invention takes following technical scheme:
The invention provides a kind of wind energy turbine set low voltage ride-through capability evaluation method based on WAMS data, said method comprising the steps of:
Step 1: calculate different grid-connected point voltage and fall the Wind turbines off-grid time under level;
Step 2: analyze low voltage ride-through capability of wind turbine generator system;
Step 3: evaluate the evaluation of wind energy turbine set low voltage ride-through capability.
In described step 1, after detecting that grid-connected point voltage falls, according to " wind energy turbine set access power system technology regulation " in GB/T 19963-2011 standard, calculate grid-connected point voltage and fall percentage, and then determine that grid-connected point voltage falls time started, Voltage Drop finish time, voltage resume start time and voltage resume finish time, using Voltage Drop finish time as zero moment, calculate different grid-connected point voltage and fall the Wind turbines off-grid time under level.
In described step 1, fall percentage x with grid-connected point voltage represent if grid-connected point voltage falls level, Wind turbines off-grid time t
xrepresent, be divided into following two kinds of situations to calculate t
x, have:
(1), during x>0.2, have:
t
x＝0.625+[(x-0.2)*(2-0.625)]/(0.9-0.2)＝0.625+(x-0.2)*1.375/0.7 (1)
(2), during x<0.2, have:
t
x＝0.625-[(0.2-x)*(2-0.625)]/(0.9-0.2)＝0.625-(0.2-x)*1.375/0.7 (2)。
In described step 2, falling level and each Wind turbines switching value by detecting grid-connected point voltage, determining off-grid Wind turbines and whether the runnability calculating off-grid Wind turbines meets the requirements, complete the analysis of low voltage ride-through capability of wind turbine generator system.
Described step 2 specifically comprises the following steps:
Step 2-1: judge whether Wind turbines off-grid occurs by detecting the runnability satisfactory Wind turbines switching value when 2s, if not there is off-grid, think that Wind turbines possesses low voltage ride-through capability, otherwise continue to detect the switching value of this Wind turbines in the off-grid moment, if there is no off-grid at off-grid moment Wind turbines, then think that this Wind turbines possesses low voltage ride-through capability equally, otherwise think that this Wind turbines does not possess low voltage ride-through capability;
Step 2-2: establish wind energy turbine set to have n typhoon group of motors, the i-th typhoon group of motors continuous working period was t
xi, the i-th typhoon group of motors off-grid time was t
i, wherein i=1,2 ..., n; I-th typhoon group of motors continuous service t after grid-connected point voltage falls
xirear off-grid, so the low voltage ride-through capability evaluation of estimate of the i-th typhoon group of motors can be expressed as:
V
geneval＝t
xi/t
i(3)
Wherein, V
genevalbe the low voltage ride-through capability evaluation of estimate of the i-th typhoon group of motors, its span is expressed as:
In described step 3, according to the following formula the low voltage ride-through capability of wind energy turbine set is evaluated, has:
V
farmeval＝S
eval/S
gen(5)
Wherein, S
evalfor the low voltage ride-through capability of wind turbine generator system sum of off-grid in wind energy turbine set; S
genfor the satisfactory Wind turbines number of units of performance in wind energy turbine set; V
farmevalfor the low voltage ride-through capability evaluation of estimate of wind energy turbine set, V
farmeval≤ 1; And V
farmevalless, show that the low voltage ride-through capability of wind energy turbine set is poorer.
Compared with prior art, beneficial effect of the present invention is:
(1) by utilizing and site actual measurement WAMS voltage data, gather Wind turbines and the voltage information of site, calculate its value and fall percentage, and analyze Voltage Drop start time, Voltage Drop finish time, voltage resume start time and voltage resume finish time.Again according to the Wind turbines switching value information gathered, namely computable analysis goes out the duration that when grid-connected point voltage drops to 20% rated voltage, Wind turbines is incorporated into the power networks and whether meets regulatory requirements.Simultaneously, whether in 2s, 90% of rated value is returned to after the grid-connected point voltage of computable analysis falls, and whether have Wind turbines off-grid after returning to this value in grid-connected point voltage 2s, and carry out computational analysis according to the recovery capability of active power information to the active power not cutting out Wind turbines gathered, thus realize the monitoring analysis to low voltage ride-through capability of wind turbine generator system;
(2) by the preliminary treatment to WAMS data, be the data model that system can identify by PMU data transformations, carry out analysis to low power event to judge, when after generation Voltage Drop event, according to Wind turbines switching value information realization Wind turbines off-grid Time Calculation, further according to the wind energy turbine set off-grid Wind turbines information realization that monitors to the evaluation of wind energy turbine set low voltage ride-through capability.By the satisfactory Wind turbines of each performance of wind energy turbine set, calculate its low voltage ride-through capability evaluation of estimate sum, carry out evaluation according to comprehensive evaluation to calculate, realize wind energy turbine set low voltage ride-through capability monitoring and evaluation, can for promoting that the low performance of wearing of wind energy turbine set provides Technical Reference and foundation.
Accompanying drawing explanation
Fig. 1 is the wind energy turbine set low voltage ride-through capability evaluation method flow chart based on WAMS data in the embodiment of the present invention;
Fig. 2 is LVRT Capability of Wind Turbine Generator performance requirement schematic diagram in the embodiment of the present invention;
Fig. 3 is Wind turbines off-grid time requirement schematic diagram under different magnitude of voltage in the embodiment of the present invention;
Fig. 4 is the Wind turbines off-grid time diagram that in the embodiment of the present invention, grid-connected point voltage is corresponding under dropping to 10% rated voltage;
Fig. 5 is the Wind turbines off-grid time diagram that in the embodiment of the present invention, grid-connected point voltage is corresponding under dropping to 30% rated voltage;
Fig. 6 is the Wind turbines off-grid time diagram that in the embodiment of the present invention, grid-connected point voltage is corresponding under dropping to 60% rated voltage;
Fig. 7 is the Wind turbines off-grid time diagram that in the embodiment of the present invention, grid-connected point voltage is corresponding under dropping to 80% rated voltage.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
As Fig. 1, the wind energy turbine set low voltage ride-through capability evaluation method based on WAMS data comprises the following steps:
Step 1: calculate different grid-connected point voltage and fall the Wind turbines off-grid time under level;
Step 2: analyze low voltage ride-through capability of wind turbine generator system;
Step 3: evaluate the evaluation of wind energy turbine set low voltage ride-through capability.
" wind energy turbine set access power system technology regulation " requirement in GB/T 19963-2011 standard, Wind turbines should have the low voltage ride-through capability that can maintain the 625ms that is incorporated into the power networks when grid-connected point voltage falls to 20% rated voltage; Wind farm grid-connected point voltage can return to 90% of rated voltage after falling in 2s time, Wind turbines should have the ability that not off-grid runs continuously, as Fig. 2.When dissimilar fault occurs in electric power system, if wind farm grid-connected examination voltage is all in fig. 2 in voltage profile lines and above region, Wind turbines must ensure that off-grid does not run continuously; Otherwise, allow Wind turbines to cut out.
For the Wind turbines off-grid time under more different magnitude of voltage, allow the Wind turbines of the corresponding proportional time of off-grid time under relevant voltage to allow the off-grid time Wind turbines corresponding with 0.2 times of rated voltage, Wind turbines corresponding to 0.2 times of rated voltage allows the off-grid time to be 625ms.
After detecting that grid-connected point voltage falls, according to " wind energy turbine set access power system technology regulation " in GB/T 19963-2011 standard, calculate grid-connected point voltage and fall percentage, and then determine that grid-connected point voltage falls time started, Voltage Drop finish time, voltage resume start time and voltage resume finish time, using Voltage Drop finish time as zero moment, calculate different grid-connected point voltage and fall the Wind turbines off-grid time under level.
In described step 1, (as Fig. 3) is with 0.5 times of rated voltage and Wind turbines off-grid time t corresponding to 0.7 times of rated voltage
1and t
2for example, calculate the corresponding Wind turbines off-grid time, have:
(t
1-0.625)/(2-0.625)＝(0.5-0.2)/(0.9-0.2)
(t
2-0.625)/(2-0.625)＝(0.7-0.2)/(0.9-0.2)
For the off-grid time is intuitively described, Fig. 4-Fig. 7 lists grid-connected point voltage wind and does not drop to Wind turbines corresponding under 10%, 30%, 60% and 80% rated voltage and allow off-grid time t
x, be respectively 0.43s, 0.82s, 1.41s and 1.80s as calculated.
In described step 2, falling level and each Wind turbines switching value by detecting grid-connected point voltage, determining off-grid Wind turbines and whether the runnability calculating off-grid Wind turbines meets the requirements, complete the analysis of low voltage ride-through capability of wind turbine generator system.
Described step 2 specifically comprises the following steps:
Step 2-1: judge whether Wind turbines off-grid occurs by detecting the runnability satisfactory Wind turbines switching value when 2s, if not there is off-grid, think that Wind turbines possesses low voltage ride-through capability, otherwise continue to detect the switching value of this Wind turbines in the off-grid moment, if there is no off-grid at off-grid moment Wind turbines, then think that this Wind turbines possesses low voltage ride-through capability equally, otherwise think that this Wind turbines does not possess low voltage ride-through capability;
Step 2-2: establish wind energy turbine set to have n typhoon group of motors, the i-th typhoon group of motors continuous working period was t
xi, the i-th typhoon group of motors off-grid time was t
i, wherein i=1,2 ..., n; I-th typhoon group of motors continuous service t after grid-connected point voltage falls
xirear off-grid, so the low voltage ride-through capability evaluation of estimate of the i-th typhoon group of motors can be expressed as:
V
geneval＝t
xi/t
i(3)
Wherein, V
genevalbe the low voltage ride-through capability evaluation of estimate of the i-th typhoon group of motors, its span is expressed as:
In described step 3, according to the following formula the low voltage ride-through capability of wind energy turbine set is evaluated, has:
V
farmeval＝S
eval/S
gen(5)
Wherein, S
evalfor the low voltage ride-through capability of wind turbine generator system sum of off-grid in wind energy turbine set; S
genfor the satisfactory Wind turbines number of units of performance in wind energy turbine set; V
farmevalfor the low voltage ride-through capability evaluation of estimate of wind energy turbine set, V
farmeval≤ 1; And V
farmevalless, show that the low voltage ride-through capability of wind energy turbine set is poorer.
After the low voltage ride-through capability evaluation of wind energy turbine set completes, carry out data display, process is as follows:
A) show the low voltage crossing score value of each wind energy turbine set, calculate the evaluation of estimate of each wind energy turbine set low voltage crossing according to low voltage crossing evaluation algorithms, adopt the form of ranking list;
B) show the analysis of wind energy turbine set low voltage ride-through capability, comprise the low voltage crossing event of each wind energy turbine set, off-grid Wind turbines statistics and historical data statistics;
C) show wind energy turbine set low voltage crossing whole network data statistics, comprise each wind energy turbine set low voltage crossing number of times and pass through successfully whether number of success data statistics;
D) show wind energy turbine set low voltage crossing area data statistics, comprise regional wind power low voltage crossing number of times and the whole network low voltage crossing event data statistics.
E) show wind energy turbine set low voltage crossing event scatter diagram, comprise voltage resume normally and do not recover normal low voltage crossing event data statistics.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; those of ordinary skill in the field still can modify to the specific embodiment of the present invention with reference to above-described embodiment or equivalent replacement; these do not depart from any amendment of spirit and scope of the invention or equivalent replacement, are all applying within the claims of the present invention awaited the reply.
Claims (6)
1., based on a wind energy turbine set low voltage ride-through capability evaluation method for WAMS data, it is characterized in that: said method comprising the steps of:
Step 1: calculate different grid-connected point voltage and fall the Wind turbines off-grid time under level;
Step 2: analyze low voltage ride-through capability of wind turbine generator system;
Step 3: evaluate the evaluation of wind energy turbine set low voltage ride-through capability.
2. the wind energy turbine set low voltage ride-through capability evaluation method based on WAMS data according to claim 1, it is characterized in that: in described step 1, after detecting that grid-connected point voltage falls, according to " wind energy turbine set access power system technology regulation " in GB/T 19963-2011 standard, calculate grid-connected point voltage and fall percentage, and then determine that grid-connected point voltage falls the time started, Voltage Drop finish time, voltage resume start time and voltage resume finish time, using Voltage Drop finish time as zero moment, calculate different grid-connected point voltage and fall the Wind turbines off-grid time under level.
3. the wind energy turbine set low voltage ride-through capability evaluation method based on WAMS data according to claim 1 and 2, is characterized in that: in described step 1, falls percentage x and represents, Wind turbines off-grid time t if grid-connected point voltage falls level with grid-connected point voltage
xrepresent, be divided into following two kinds of situations to calculate t
x, have:
(1), during x>0.2, have:
t
x＝0.625+[(x-0.2)*(2-0.625)]/(0.9-0.2)＝0.625+(x-0.2)*1.375/0.7 (1)
(2), during x<0.2, have:
t
x＝0.625-[(0.2-x)*(2-0.625)]/(0.9-0.2)＝0.625-(0.2-x)*1.375/0.7 (2)。
4. the wind energy turbine set low voltage ride-through capability evaluation method based on WAMS data according to claim 1, it is characterized in that: in described step 2, level and each Wind turbines switching value is fallen by detecting grid-connected point voltage, determine off-grid Wind turbines and whether the runnability calculating off-grid Wind turbines meets the requirements, complete the analysis of low voltage ride-through capability of wind turbine generator system.
5. the wind energy turbine set low voltage ride-through capability evaluation method based on WAMS data according to claim 1 or 4, is characterized in that: described step 2 specifically comprises the following steps:
Step 2-1: judge whether Wind turbines off-grid occurs by detecting the runnability satisfactory Wind turbines switching value when 2s, if not there is off-grid, think that Wind turbines possesses low voltage ride-through capability, otherwise continue to detect the switching value of this Wind turbines in the off-grid moment, if there is no off-grid at off-grid moment Wind turbines, then think that this Wind turbines possesses low voltage ride-through capability equally, otherwise think that this Wind turbines does not possess low voltage ride-through capability;
Step 2-2: establish wind energy turbine set to have n typhoon group of motors, the i-th typhoon group of motors continuous working period was t
xi, the i-th typhoon group of motors off-grid time was t
i, wherein i=1,2 ..., n; I-th typhoon group of motors continuous service t after grid-connected point voltage falls
xirear off-grid, so the low voltage ride-through capability evaluation of estimate of the i-th typhoon group of motors can be expressed as:
V
geneval＝t
xi/t
i(3)
Wherein, V
genevalbe the low voltage ride-through capability evaluation of estimate of the i-th typhoon group of motors, its span is expressed as:
6. the wind energy turbine set low voltage ride-through capability evaluation method based on WAMS data according to claim 1, is characterized in that: in described step 3, evaluates according to the following formula, have the low voltage ride-through capability of wind energy turbine set:
V
farmeval＝S
eval/S
gen(5)
Wherein, S
evalfor the low voltage ride-through capability of wind turbine generator system sum of off-grid in wind energy turbine set; S
genfor the satisfactory Wind turbines number of units of performance in wind energy turbine set; V
farmevalfor the low voltage ride-through capability evaluation of estimate of wind energy turbine set, V
farmeval≤ 1; And V
farmevalless, show that the low voltage ride-through capability of wind energy turbine set is poorer.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114362149A (en) * | 2021-12-16 | 2022-04-15 | 广东电网有限责任公司 | Method, system, equipment and medium for evaluating new energy power generation bearing capacity |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003501993A (en) * | 1999-05-28 | 2003-01-14 | エービービー エービー | Wind power plant |
| CN104156889A (en) * | 2014-08-15 | 2014-11-19 | 国家电网公司 | Wind farm performance evaluation system based on WAMS data and evaluation method thereof |
-
2015
- 2015-01-22 CN CN201510031928.0A patent/CN104578161A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003501993A (en) * | 1999-05-28 | 2003-01-14 | エービービー エービー | Wind power plant |
| CN104156889A (en) * | 2014-08-15 | 2014-11-19 | 国家电网公司 | Wind farm performance evaluation system based on WAMS data and evaluation method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114362149A (en) * | 2021-12-16 | 2022-04-15 | 广东电网有限责任公司 | Method, system, equipment and medium for evaluating new energy power generation bearing capacity |
| CN114362149B (en) * | 2021-12-16 | 2024-04-16 | 广东电网有限责任公司 | New energy power generation bearing capacity assessment method, system, equipment and medium |
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Application publication date: 20150429 |