CN106451543B - A kind of flexible emulation mode of LVRT Capability of Wind Turbine Generator output characteristics - Google Patents
A kind of flexible emulation mode of LVRT Capability of Wind Turbine Generator output characteristics 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
- 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
A kind of flexible emulation mode of LVRT Capability of Wind Turbine Generator output characteristics, belong to Simulating technique in Electric Power System field, it is active that this method is based on double-fed blower, idle independent control, and the relatively independent feature of part control parameter in real power control module, fit key control parameter and the low linear corresponding relation worn between period active power output characteristics, further the control parameter is picked out using the active output measured data of low voltage crossing of any unit under any operating condition, the flexible emulation for the low voltage crossing active power output characteristics under any other operating condition can be completed based on this, the present invention overcomes traditional full working scope low voltage crossings to test the defect taken time and effort, it is that a kind of flexibility is high, the good LVRT Capability of Wind Turbine Generator output characteristics emulation mode of accuracy.
Description
Technical field
The invention belongs to Simulating technique in Electric Power System field, in particular to a kind of LVRT Capability of Wind Turbine Generator output characteristics
Flexible emulation mode.
Background technique
Low voltage ride through characteristic has a major impact interconnected electric power system safe and stable operation, therefore low-voltage
Passing through characteristic test is the grid-connected indispensable detection project of blower.The full working scope low voltage crossing test of Wind turbines is to be detected
Wind turbines most comprehensively judge by test, and wherein full working scope test refers to that different load state, different voltages are fallen under degree
Low voltage ride-through capability detection.
Wind turbines are carried out with the test of full working scope low voltage crossing comprehensively, and there are following three disadvantages：1, single blower needs
Carrying out repeatedly test just can ensure that it all has low voltage ride-through capability under various operating conditions, and test process is complicated, time-consuming；2,
The load condition and Voltage Drop value tested each time be all it is discrete, can only obtain the low voltage crossing situation of test point；3,
Practical wind power plant apoplexy machine class, model are numerous, in view of the complexity of test process, can only generally be sampled test, be difficult
Accomplish that all standing to whole units is tested.
But in order to carry out safety analysis to the electric system for having Large Scale Wind Farm Integration grid-connected, it is necessary to different type wind
Low voltage crossing output characteristics under machine, different operating conditions is simulated.
Summary of the invention
In order to overcome traditional full working scope low voltage crossing to test existing defect, the object of the present invention is to provide a kind of wind-powered electricity generations
The flexible emulation mode of unit low voltage crossing output characteristics can be realized active to LVRT Capability of Wind Turbine Generator under different operating conditions
The flexible emulation of power output.
In order to achieve the above object, the technical scheme is that：
A kind of flexible emulation mode of LVRT Capability of Wind Turbine Generator output characteristics, includes the following steps：
Step 1：Determine the characteristic quantity of characterization active power variation characteristic, including：Active power drop depth P, wattful power
The quick climb altitude b of the rate and slow climbing speed a of active power,
The average value P that since the active power drop depth P, i.e. active power climb dropping into completely2With fall
Fall preceding active-power P1Ratio, wherein fall completely refer to from the moment constantly continuous 20 active power sampled values with should
Difference between instance sample value is less than the 10% of the sampled value；Start to climb and refers to continuous 20 wattful powers from the moment constantly
Rate sampled value continues to increase；
The quick climb altitude b of the active power, i.e., active power is in the amount of climbing quickly climbed in the phase, wherein fast
The climb start time of phase of speed refers to that end time refers to continuous 20 active power sampled values from the moment at the time of starting to climb
Compared with the increment that the increment of its previous sampled value is less than the moment more previous sampled value；
The slow climbing speed a of the active power, i.e. active power slowly climb the amount of the climbing Δ a in the phase with climb
The ratio of time Δ t, wherein the slow phase of climbing refers to that quickly the phase of climbing terminates to rise to 95%P to active power1This
Period；
Step 2：It modifies to the strategy of double-fed blower active power controller first stage during low voltage crossing, respectively
Parameter K is addedmAnd TrampStage after fault clearance is divided into active fast quick-recovery and active two stages of climbing control, and
It generates active power reference value and realizes the tune to active power of output to be subsequently generated corresponding rotor current active component
It is whole；
Moment after fault clearance during low voltage crossing passes through parameter K in active quick Restoration stage firstmControl event
Active zooming amplitude after barrier excision：
Pref1=K1(|u|-K2)+Km
Then pass through parameter T in active power ramp-up periodrampControl the rate of active rising：
In formula：Pref1For active power reference value；Generator outlet voltage effective value during u is failure；K1、K2To calculate
Adjusting parameter when active reference value, default value are respectively K1=1.46, K2=0.15；Pref1To there is power control during fault traversing
Make the active power reference value of tactful first stage；T is to play active power rapid increase finish time in stage to be restored to failure
Time used in preceding numerical value；
Step 3：Change control parameter K according to control variable principle using any electric analog softwaremAnd TrampIt carries out low
Voltage ride-through emulation, obtains active power waveform, extracts three characteristic quantities in active power waveform：Active power drop depth
P, the quick climb altitude b of the active power and slow climbing speed a of active power, establishes fitting data collection；
Using single order polynomial function to control parameter KmIt quickly climbs height with active power drop depth P and active power
Functional relation between degree b is fitted；Again to control parameter TrampWith active power drop depth P, control parameter KmWith it is active
Functional relation between the slow rate of climb a of power is fitted, that is, is had：
In formula：x1、x2、x3、y1、y2、y3Respectively two to the undetermined parameter in fitting function；
Step 4：The characteristic quantity for extracting actual measurement active power waveform, is recognized using the formula in third step, is controlled
Parameter K processedmAnd Tramp, utilize KmAnd TrampIt can be completed for the low voltage crossing active power output under any other operating condition
The flexible emulation of characteristic.
The features of the present invention and effect：
The method of the present invention has rapidly and accurately picked out the crucial control of blower low voltage crossing active power controller part
Parameter, realize simulation model low voltage crossing period active power output with actual set higher degree coincide, in turn
The flexible emulation to the active output characteristics of blower low voltage crossing under any operating condition is realized, the flexible of emulation is substantially increased
Property, accuracy, compensate for the defect of live low voltage crossing test.
Detailed description of the invention
Fig. 1 is that active power exports Characteristic Extraction schematic diagram.
Fig. 2 is measured data and emulation data comparison figure.
Specific embodiment
The flexible emulation mode of LVRT Capability of Wind Turbine Generator output characteristics proposed by the present invention, it is detailed in conjunction with accompanying drawings and embodiments
Carefully it is described as follows.
Step 1：Referring to Fig.1, the characteristic quantity of characterization active power variation characteristic is determined, including：Active power drop depth
P, the quick climb altitude b of active power, the slow climbing speed a of active power.
Step 2：It modifies to the strategy of double-fed blower active power controller first stage during low voltage crossing, respectively
Parameter K is addedmAnd TrampStage after fault clearance is divided into active fast quick-recovery and active two stages of climbing control.
Step 3：According to control variable principle, change control parameter KmAnd TrampLow voltage crossing emulation is carried out, is obtained active
Power waveform.Extract three characteristic quantities in active power waveform：Active power drop depth P, active power are quickly climbed height
The b and slow climbing speed a of active power is spent, it is as follows to establish fitting data collection：
1 fitting data collection of table
Using single order polynomial function to control parameter KmIt quickly climbs height with active power drop depth P and active power
Functional relation between degree b is fitted；Again to control parameter TrampWith active power drop depth P, control parameter KmWith it is active
Functional relation between the slow rate of climb a of power is fitted.Have：
Km=f1(P, b)=0.076+0.142 × P+1.199 × b
f1The error sum of squares of fitting result is less than 2%, KmF when taking different value2The error sum of squares of fitting result is respectively less than
0.1%, show single order multinomial model fitting precision with higher, can satisfy the demand of parameter identification.
Step 4：The characteristic quantity for extracting the active measured waveform in the case of Voltage Drop 20%, obtains active power and falls depth
Degree P is 0.089, the quick climb altitude b of active power is 0.21, the slow climbing speed a of active power is 0.6762.Use third
Formula in step is recognized, and P and b are brought into f1In can obtain control parameter KmIt is 0.3268, selects f2Middle KmWhen=0.3
Corresponding function brings P and a into and obtains control parameter TrampIt is 0.6603.It is carried out in simulation software using obtained control parameter
The test of low voltage crossing compares the active curve that test obtains with actual active curve, and discovery allows in error
In the range of both matching it is good, reached expected parameter identification effect, specifically referred to Fig. 2.Therefore, K is utilizedmAnd Tramp
The flexible emulation for the low voltage crossing active power output characteristics under any other operating condition can be completed.
Claims (1)
1. a kind of flexible emulation mode of LVRT Capability of Wind Turbine Generator output characteristics, which is characterized in that include the following steps：
Step 1：Determine the characteristic quantity of characterization active power variation characteristic, including：Active power drop depth P, active power are fast
The fast climb altitude b and slow climbing speed a of active power,
The average value P that since the active power drop depth P, i.e. active power climb dropping into completely2With fall before have
Function power P1Ratio, wherein fall refer to that continuous 20 active power sampled values are adopted with the moment from the moment constantly completely
Difference between sample value is less than the 10% of the instance sample value；Start to climb and refers to continuous 20 active power from the moment constantly
Sampled value continues to increase；
The quick climb altitude b of the active power, i.e., active power is in the amount of climbing quickly climbed in the phase, wherein quickly climbs
The start time of the phase of liter refers to that end time refers to that continuous 20 active power sampled values are compared with it from the moment at the time of starting to climb
The increment of previous sampled value is less than the increment of the moment more previous sampled value；
The slow climbing speed a of the active power, i.e., active power is in the amount of climbing Δ a and the time-to-climb in the phase of slowly climbing
The ratio of Δ t, wherein the slow phase of climbing refers to that quickly the phase of climbing terminates to rise to 95%P to active power1This when
Phase；
Step 2：It modifies, is separately added into the strategy of double-fed blower active power controller first stage during low voltage crossing
Parameter KmAnd TrampStage after fault clearance is divided into active fast quick-recovery and active two stages of climbing control, and is generated
Active power reference value realizes the adjustment to active power of output to be subsequently generated corresponding rotor current active component；
Moment after fault clearance during low voltage crossing passes through parameter K in active quick Restoration stage firstmControl failure is cut
Except rear active zooming amplitude：
Pref1=K1(|u|-K2)+Km
Then pass through parameter T in active power ramp-up periodrampControl the rate of active rising：
In formula：Generator outlet voltage effective value during u is failure；K1、K2To calculate adjusting parameter when active reference value, write from memory
Recognizing value is respectively K1=1.46, K2=0.15；Pref1For the active power ginseng of real power control strategy first stage during fault traversing
Examine value；T be play active power rapid increase finish time in stage be restored to failure before the time used in numerical value；
Step 3：Change control parameter K according to control variable principle using any electric analog softwaremAnd TrampCarry out low-voltage
Emulation is passed through, active power waveform is obtained, extracts three characteristic quantities in active power waveform：Active power drop depth P, have
The quick climb altitude b of the function power and slow climbing speed a of active power, establishes fitting data collection；
Using single order polynomial function to control parameter KmWith the active power drop depth P and quick climb altitude b of active power it
Between functional relation be fitted；Again to control parameter TrampWith active power drop depth P, control parameter KmAnd active power
Functional relation between slow rate of climb a is fitted, that is, is had：
In formula：x1、x2、x3、y1、y2、y3Respectively two to the undetermined parameter in fitting function；
Step 4：The characteristic quantity for extracting actual measurement active power waveform, is recognized using the formula in step 3, obtains control parameter
KmAnd Tramp, utilize KmAnd TrampIt can be completed for the low voltage crossing active power output characteristics under any other operating condition
Flexibly emulation.
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| WO2012039034A1 (en) * | 2010-09-22 | 2012-03-29 | 東芝三菱電機産業システム株式会社 | Power conversion device |
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| CN102510083A (en) * | 2011-11-07 | 2012-06-20 | 清华大学 | Integration protection method capable of reducing wind power field low-voltage crossing capacity requirement |
| CN103606959A (en) * | 2013-12-09 | 2014-02-26 | 华北电力大学 | Low/high-voltage through optimization control method for doubly-fed wind power generation system |
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