CN106532765A - Wind power generator set low voltage ride through capability testing method considering phase jump - Google Patents
Wind power generator set low voltage ride through capability testing method considering phase jump Download PDFInfo
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Abstract
The invention relates to a wind power generator set low voltage ride through capability testing method considering phase jump. The method comprises a step of improving a voltage sag generator and determining a voltage drop specification, a step of carrying out short circuit capacity testing, and determining the resistance of a current limit reactor Xsr connected to a system, a step of adjusting the short circuit reactor Zsc resistance and reactance in an improved voltage sag generator, generating a voltage drop specification needed by a test at a testing point, and testing whether the voltage drop specification is in accordance with a requirement, a step of carrying out no-load testing and load testing according to the test voltage specification in the step (S3), and a step of summing testing and evaluation results after the tests are completed. According to the method, the low voltage ride through capability of the wind power generator set can be evaluated more strictly, and thus the safe accident of the wind power generator set which passes a low voltage ride through test due to the influence of the phase jump in a grid failure is prevented.
Description
Technical field
A kind of the present invention relates to LVRT Capability of Wind Turbine Generator field tests, in particular it relates to wind for considering phase hit
Power generator group low voltage ride-through capability method of testing.
Background technology
As various countries constantly strengthen the development and utilization of regenerative resource, wind energy is used as a kind of pollution-free, renewable, occupation of land
Less, the ripe new forms of energy of evaluation and exploration technology, are developed and utilize in countries in the world.Wind-power electricity generation is used as most advising at present
The new energy technology of modelling and commercialized development prospect, has obtained quick development nearly ten years.To 2010, China surmounted
The U.S. becomes the first big country of world's installed capacity of wind-driven power.As permeability of the wind-powered electricity generation in electrical network is continued to increase, the fluctuation of wind-powered electricity generation
Property and randomness cause very important impact to the stable operation of power system.
In all types of wind power generating sets, doubly fed induction generator (DFIG) has variable speed constant frequency service ability because of which,
Pwm converter capacity is little, the advantages of low production cost, it has also become the Wind turbines being most widely used.But because its stator it is direct
Grid-connected, rotor is connected with electrical network by exciter converter, and small-power current transformer is limited to the control ability of unit, therefore DFIG
To electric network fault, especially Voltage Drop failure is particularly sensitive.
At present, new wind-electricity integration directive/guide has been drafted by existing multiple countries, it is desirable to which Wind turbines must be worn with low-voltage
More (LVRT) ability.The wind energy turbine set that China issues for 2011 accesses power system technology regulation and clearly proposes：It is wind farm grid-connected
When point voltage drops to 20% nominal voltage, the Wind turbines in wind energy turbine set should ensure that off-grid does not continuously run 625ms；Wind-powered electricity generation is simultaneously
Site voltage can return to the 90% of nominal voltage after falling in 2s when, the Wind turbines in wind energy turbine set should ensure that not
Off-grid continuously runs.Issue within 2014 simultaneously《Low voltage ride-through capability of wind turbine generator system test procedure》Concrete regulation low-voltage
Pass through basic demand, test content, test equipment and the testing procedure of on-the-spot test.But above test procedure does not consider voltage
There is the situation of phase hit when falling.
Phase hit has been defined as the 3rd key character of voltage dip by IEEE Std1564-2014.Electrical network occurs
During short trouble, because the system impedance of wind power integration electrical network and the impedance angle of fault impedance are different, phase hit will be with voltage
Amplitude falls appearance.Existing many researchs show, in the case where amplitude and trouble duration is equally fallen, phase place occurs and jumps
Change will cause DFIG stator magnetic linkages oscillation amplitude to increase, and cause higher rotor overcurrent, dc bus overvoltage etc. a series of
More serious transient process, threatens rotor current transformer and unit safety, and low voltage crossing may be caused to fail.At the same time,
Controlled using vector oriented more than Wind turbines, actual orientation has certain time lag, in phase because adopting filtering or integrating denoising link
During the saltus step of angle, the change of quick tracking angle is more difficult, causes larger directional bias.Now unit allocation poor-performing, machine
Group will suffer from even more serious transient process, in addition will cause Wind turbines because excessively stream, overvoltage protection action and too early from electrical network
Middle excision.When unit is subjected to identical grid voltage sags amplitude, if there is phase angle saltus step, the failure that unit can bear continues
Time will shorten；And when unit bears certain trouble duration, if there is phase angle saltus step, the electrical network that unit can be resisted
Voltage Drop amplitude can reduce；I.e. phase hit can reduce the low voltage crossing domain of Wind turbines.Therefore in the low electricity of Wind turbines
When pressure passes through test, it is considered to which the impact of phase hit is very necessary.
The voltage adopted by the low voltage ride-through capability test procedure (NB/T31051 2014) of existing Wind turbines falls
Generating apparatus schematic diagram of shaving one's head is as shown in Figure 1.During test, voltage sag generator series connection is entered into wind-driven generator and electrical network
In, Voltage Drop is produced using impedance voltage divider principle in test point.Regulation reactance resistance can produce the voltage of different depth and fall
Fall, adjust the switching time that short switch can control short-circuit reactance, and as shown in table 1 below 5 kind specification is produced with this
Voltage Drop.
1 Voltage Drop specification of table
During test, the Voltage Drop situation of test point when Voltage Drop specification is as no load test specified in table 1.In wind
Power generator group is unloaded and loading condition under, simulation three-phase voltage falls and falls two kinds of failure conditions with two-phase voltage and carry out respectively
Test, investigates Wind turbines to different Voltage Drop amplitudes and the defensive ability/resistance ability of duration.
The shortcoming that prior art is present：
Voltage sag generator in existing test procedure is only capable of adjusting trouble point because of the voltage divider principle using two reactance
The amplitude of Voltage Drop and duration, it is impossible to produce voltage-phase saltus step in test point；The Voltage Drop rule specified during test
In lattice, the factor of phase hit is not also considered, this and modal Voltage Drop accompanying event saltus step in electrical network physical fault
Situation is not inconsistent, it is impossible to which actual response Wind turbines are subjected to the low voltage crossing process showed during physical fault.Pass through existing
The Wind turbines of test, during being actually incorporated into the power networks, even if run into temporary range of decrease value and trouble duration with test phase
With Voltage Drop failure, because the impact of phase hit, it is equally possible to cause overcurrent and overvoltage to exceed protection limit value, cause
Cut machine protection act so that LVRT Capability of Wind Turbine Generator fails, affect safe operation of electric network.
The content of the invention
It is an object of the present invention to consider Voltage Drop amplitude and the phase hit angle of different faults type in actual electric network
The corresponding relation of degree, with Voltage Drop amplitude, trouble duration, fault point voltage phase hit is three elements, from three sides
Face regulation test voltage falls specification, there is provided a kind of low voltage ride through capacity of wind generating set test side of consideration phase hit
Method, tests to the low voltage ride-through capability of Wind turbines under different operating modes, assesses the low voltage crossing energy of Wind turbines
Power.
For achieving the above object, the technical scheme is that：A kind of low electricity of wind power generating set for considering phase hit
Pressure ride-through capability method of testing, comprises the steps,
S1：Voltage sag generator is improved, Voltage Drop specification is determined；
S2：Capacity of short circuit test is carried out, the current-limiting reactor X of access system is determinedsrResistance；
S3：Adjust short-circuit impedance Z in improved voltage sag generatorscResistance value and reactance value, produce in test point
Test required voltage falls specification, and test voltage falls whether specification meets the requirements；
S4：According to the test voltage specification in step S3, no load test and load testing is carried out；
S5：After the completion of test, collect test and assessment result.
In an embodiment of the present invention, step S1 is implemented as follows,
S11：Replace the short-circuit reactance in existing sag generator with adjustable short-circuit impedance, or in short-circuit reactance
Serial adjustable resistance afterwards is grounded；
S12：On the basis of testing the electric network impedance angle that blower fan accesses electrical network, with reference to grid entry point voltage magnitude and phase hit
The corresponding relation of angle, calculating proper phase saltus step angle, and the saltus step angle value of each phase voltage is calculated according to fault type,
It is determined that considering the Voltage Drop specification of phase hit.
In an embodiment of the present invention, step S2 is implemented as follows,
S21：Check each position of the switch, carry out capacity of short circuit test, set the net capacity of low voltage crossing test point as
More than 3 times of Wind turbines rated capacity；
S22：Required according to capacity of short circuit value, it is determined that series connection current-limiting impedance value scope.
In an embodiment of the present invention, step S3 is implemented as follows,
S31：By the current-limiting reactor resistance determined in step S2, short-circuit impedance resistance is calculated；
A, by the current-limiting reactor X determined in step S2srResistance Xsr1, and the system impedance entered from terms of test device access point M
Zsr0, system impedance Z of short dot is obtained by following formulasr：
Zsr=Zsr0+Xsr1=Rsr+jXsr (1)
In formula, RsrFor the resistance value of short dot system impedance, XsrFor the reactance value of short dot system impedance；
The short-circuit impedance value that b, test need is represented by
Zsc=Rsc+jXsc (2)
In formula, RscFor the resistance value of short-circuit impedance, XscFor the reactance value of short-circuit impedance；
By formula (2) and following formula (3), each phase voltage obtained with reference to step S12 falls amplitude UxWith the phase hit of each phase
AngleShort-circuit impedance value can be tried to achieve, wherein x represents a, b, c three-phase respectively；
S32：Improved voltage sag generator series connection is entered into Wind turbines step-up transformer high-pressure side, by step
Result of calculation in S31, adjusts each phase short-circuit impedance value in voltage sag generator, produces meter and phase hit in grid entry point
Voltage Drop；
S33：Whether detection grid entry point Voltage Drop specification meets the requirements.
In an embodiment of the present invention, step S4 is implemented as follows,
S41：No load test is carried out, test data is recorded；
S42：In the case where test point capacity of short circuit and no load test result meet requirement, load testing is carried out, is recorded
Test data.
In an embodiment of the present invention, step S5 is implemented as follows,
S51：Collect and process test data；
S52：Required according to low voltage ride-through capability of wind turbine generator system, assess test result.
Compared to prior art, the invention has the advantages that：
The present invention considers the LVRT Capability of Wind Turbine Generator method of testing of phase hit, is fallen based on grid-connected point voltage after failure
The corresponding relation of the amplitude that falls and phase hit angle, proposes that the test voltage for considering phase hit falls specification first, and proposes
A kind of concrete method of adjustment when the sag generator improvement project for producing relevant voltage drop test specification and test；Meter and
The Voltage Drop test specification of phase hit, can more really reflect the situation of change of grid-connected point voltage after failure；After improvement
Voltage sag generator can adjust and produce arbitrary test voltage and fall amplitude, phase hit angle according to test request
Degree；After considering when low voltage crossing is tested that the impact of phase hit, test and assessment result more really can reflect electric network fault
The influence process and low voltage ride-through capability of Wind turbines；Therefore, with the low voltage crossing testing scheme for considering phase hit,
The low voltage ride-through capability of assessment Wind turbines that can be tightened up, the Wind turbines for making to have passed through low voltage crossing test will not be because
For electric network fault when phase hit impact there is security incident.
Description of the drawings
Fig. 1 is existing Wind turbines test procedure voltage sag generator schematic diagram.
Fig. 2 is improved voltage sag generator structure chart.
Fig. 3 is wind power integration electric network fault system schematic.
Fig. 4 is that feature falls the Changing Pattern of amplitude and proper phase saltus step angle with Relative fault distance.
Fig. 5 is the corresponding relation that feature falls amplitude and proper phase saltus step angle.
Fig. 6 is the voltage vector-diagram under failure (A class failures).
Fig. 7 is the voltage vector-diagram under double earthfault (C class failures).
Fig. 8 is the low voltage ride-through capability testing scheme flow chart for considering phase hit.
Specific embodiment
Below in conjunction with the accompanying drawings, technical scheme is specifically described.
A kind of low voltage ride through capacity of wind generating set method of testing of consideration phase hit of the present invention, key step
It is as follows：
1st, voltage sag generator is improved, determines Voltage Drop specification.
Comprise the following steps that：
1) improve voltage sag generator.Replace short in existing sag generator with adjustable short-circuit impedance
Road reactance, such as Fig. 2.Improved Voltage Drop device series connection is entered into Wind turbines step-up transformer high-pressure side during test, is boosted
Transformer adopts star triangle joint.During test using impedance voltage divider principle and system impedance and short-circuit impedance impedance angle not
Together, Voltage Drop and phase hit are produced in test point.
The low-voltage ride-through testing system topological structure after improving, X has been given in Fig. 2sr1For current-limiting reactor, ZscFor short
Roadlock resists, Zsr0Be the system impedance entered from terms of test device access point M, then system impedance Z for entering from from the point of view of short circuitsrFor：
Zsr=Zsr0+Xsr1=Rsr+jXsr (1)
For electrical network rated voltage, then short-circuit point voltageForm can be written as：
Phase angle change is accordingly：
In formula：X represents a, b, c three-phase.
2) determine Voltage Drop specification.Works Understanding Power Quality Problem:Voltage
Sag and Interruption (M.H.J.Bollen, Piscataway, NJ, USA:IEEE, 2000) proposing will symmetrically and not
The voltage dip that symmetrical short-circuit failure is caused is divided into 7 types, and the test failure type of low voltage crossing test request is three-phase
On the basis of failure and phase to phase fault, therefore the A classes three-phase fault so that Wind turbines are affected with most serious and C class two-phase phase-to phase faults
Choose Voltage Drop specification.
Fig. 3 is that wind energy turbine set accesses electrical network schematic diagram, and impedance angle α is fault impedance ZFWith system impedance ZSBetween angle, such as
Shown in formula (4), wherein ZS=RS+jXS, ZF=RF+jXF：
A classes are temporarily fallen, and three-phase voltage amplitude decline degree is essentially identical, and between a, b, c three-phase, relative angle does not occur to become
Change, its three-phase voltage expression formula is：
In formula,The perunit value of A phase voltage sags amplitude when occurring for three-phase fault.
C classes are temporarily fallen, and non-faulting phase A phase voltage keeps constant, and failure phase B, C amplitude reduces, and while to away from non-event
The direction of barrier phase is drawn close, and three-phase voltage expression formula is：
In formulaRepresent failure when two failure phases line voltages and failure before two failure phases line voltage amplitudes ratio
Value.
V in the expression formula of all kinds of temporary drop of formula (5) and (6) is claimed the character voltage of temporary drop, and character voltage is different temporary
There are different implications in drop type.A classes represent Arbitrary Fault phase voltage in temporarily dropping, temporarily drop then represents the line between two failure phases to C classes
Voltage.When impedance angle α is 0 °, the failure that is short-circuited does not result in the change of character voltage phase angle；When impedance angle is not 0 °,
Character voltage will occur phase hit, and the V in all types of temporary drop three-phase expression formulas need to be replaced with Vcos φ-jVsin φ, feature width
It is worth for V, proper phase saltus step is φ, i.e.,：
In formula：Relative fault distance lambda=| ZF|/|ZS|
Can be drawn under different electric network impedance angles by formula (7), Relative fault distance and feature amplitude, proper phase saltus step angle
Between relation, such as Fig. 4.Further, the corresponding relation between phase hit angle and Voltage Drop amplitude is obtained, is such as schemed
5。
When considering that electric network impedance angle affects, the amplitude of each phase voltage of A class failures and phase angle are represented by formula (8), accordingly
Temporary drop vectogram see Fig. 6：
When considering that electric network impedance angle affects, the amplitude of each phase voltage of C class failures and phase angle are represented by formula (9), accordingly
Temporary drop vectogram see Fig. 7：
Therefore, concretely comprise the following steps during test：
A, determine impedance angle.The actual conditions of power system are incorporated to according to test blower fan, electric network impedance angle is determined.Generally exist
In power transmission network, power distribution network and marine wind electric field Jing subsea AC cable grid connected structures, its representative value is respectively 0 °, -20 °, -60 °.
B, determine proper phase saltus step angle.Using the voltage magnitude in existing test voltage specification as character voltage width
Value, determines the relation between proper phase saltus step angle according to character voltage amplitude in Fig. 5, or by step a middle impedance angle value generation
Calculate in entering formula (7), it is determined that corresponding proper phase saltus step angle.And fill in the Voltage Drop specification after improvement into table 2.
2 proper phase saltus step angle of table
C, the amplitude phase angle for determining each phase voltage.According to the character voltage amplitude in step b table 2 and proper phase saltus step angle
Degree, the amplitude of each phase voltage and phase angle in calculating A classes and C class failures by formula (8)～(9) obtain considering the electricity of phase hit
Pressure falls specification, and fills in into table 3.
Voltage Drop specification after the improvement of table 3
2. capacity of short circuit test is carried out, the current-limiting reactor X of access system is determinedsrResistance.
Particular content is as follows：
A, each position of the switch of inspection, carry out capacity of short circuit test, set the net capacity of low voltage crossing test point as wind
More than 3 times of group of motors rated capacity.
B, according to the capacity of short circuit value in step a, setting series connection current-limiting impedance value.Due to current-limiting impedance and capacity of short circuit into
Inverse ratio, when selecting series impedance excessive, is likely to result in low voltage crossing failure.Will in setting capacity of short circuit value meets step a
When asking, current-limiting impedance size will not produce obvious transient response to Wind turbines.
3. short-circuit impedance Z in improved voltage sag generator is adjustedsrValue, produces in test point and considers phase hit
Voltage Drop specification, and test voltage falls whether specification meets the requirements.
During test, by adjusting the value of each phase short-circuit impedance and current-limiting reactor, you can adjust the amplitude that each phase voltage is fallen
With phase hit angle；By controlling cut-offfing for short switch, that is, input and the mute time of short-circuit impedance is controlled, electricity is can control
The duration that pressure is fallen；So as to produce while comprising the survey for falling amplitude, phase hit angle and trouble duration information
Voltage sag type on probation.
Particular content is as follows：
1) determine short-circuit impedance value
A, current-limiting reactor resistance X is determined by step 2sr1, and measure system impedance Z of M pointssr0, short dot is obtained by formula (1)
System impedance Zsr：
The short-circuit impedance value that b, test need is represented by
Zsc=Rsc+jXsc (10)
By formula (2) and formula (3), and amplitude U is fallen according to each phase voltage determined in step 1xWith the phase hit of each phase
Angle Djx(wherein x represents a, b, c three-phase respectively), solves formula equation group (11)：
C, by formula (11) result and formula (10), try to achieve short-circuit impedance value.
2) press step 1) in result of calculation, adjust voltage sag generator in each phase short-circuit impedance value, grid entry point produce
The Voltage Drop of livelihood and phase hit.
3) detect whether grid entry point Voltage Drop specification meets the requirements.
A, the high voltage side of transformer three-phase voltage signal for measuring is set as (by taking failure phase a phase as an example)：
In formula：U, j are respectively the amplitude virtual value and phase angle of sinusoidal signal；W is angular frequency；T is the time.
B, adopt fast fourier transform algorithm, the time period (t-T, t) in extract sinusoidal signal fundametal compoment, wherein T
For the sinusoidal signal cycle, and T=2p/w, obtaining fundametal compoment is：
In formula：Subscript fund represents fundametal compoment.
C, try to achieve phase hit value
From formula (13), voltage-phase with the functional relation of time is：
Due to the differential seat angle of phase hit moment that is voltage-phase before and after failure, then the function that Dj is write as the time is：
AgainCan obtain：
Line translation is entered to formula (16), is madeIn view of ω t=arg (ejωt), arg (A)-arg (B)
=arg (A/B), then：
4., according to the test voltage specification in step 3, no load test and load testing are carried out.
Particular content is as follows：
According to current-limiting reactor XsrResistance and step 3 in the Adjusted Option of short-circuit impedance resistance that is related to, in test point
Produce and consider that the test voltage of phase hit falls specification, carry out no load test.Tie in test point capacity of short circuit and no load test
Fruit carries out load testing in the case of meeting low voltage crossing requirement, keeps current-limiting reactor and short-circuit impedance value with zero load during test
Consistent during test, same fault type need to be tested twice.Concrete testing procedure is identical with the existing test procedure of scheme, herein no longer
Repeat.
5., after the completion of testing, test and assessment result are collected.
Particular content is as follows：
A, collect and process test data.Wind power generating set low-voltage according to being given in NB/T31051-2014 is worn
The recommendation computational methods of active power, reactive power and the voltage more tested, and step-up transformer high-pressure side phase hit angle
Degree computational methods, are processed to test data and are drawn response curve.
B, according to low voltage ride-through capability of wind turbine generator system require, assess test result.Appraisal procedure and existing test procedure
Identical, here is omitted.After the completion of test, collect test and assessment result is as shown in table 4.
Table 4 considers the low voltage crossing test result assessment of phase hit
The low voltage ride-through capability testing scheme flow process of the consideration phase hit of the voltage sag generator of application enhancements
As shown in Figure 8.
Below with its representative value α=0 ° in power transmission network and marine wind electric field Jing subsea AC cable grid connected structures and α=-
As a example by 60 °, it is determined that consideration phase hit Voltage Drop specification：
When blower fan accesses impedance angle α=0 ° of electrical network, it is considered to the proper phase in the Voltage Drop specification of phase hit
Saltus step angle and calculated each phase phase hit angle are 0 °, and testing scheme is identical with when not considering phase hit；
When blower fan accesses ≈ -60 ° of the impedance angle α of electrical network, it is considered to which the Voltage Drop specification of phase hit is as follows：
By character voltage amplitude and the corresponding relation of proper phase saltus step angle, it is considered to the Voltage Drop specification of phase hit
Such as table 5.
Table 5 considers the Voltage Drop specification of phase hit
Each phase voltage amplitude and phase hit angle value, such as table 6
6 Voltage Drop specification of table
It is more than presently preferred embodiments of the present invention, all changes made according to technical solution of the present invention, produced function are made
During with scope without departing from technical solution of the present invention, protection scope of the present invention is belonged to.
Claims (6)
1. it is a kind of consider phase hit low voltage ride through capacity of wind generating set method of testing, it is characterised in that：Including such as
Lower step,
S1：Voltage sag generator is improved, Voltage Drop specification is determined；
S2：Capacity of short circuit test is carried out, the current-limiting reactor X of access system is determinedsrResistance；
S3：Adjust short-circuit impedance Z in improved voltage sag generatorscResistance value and reactance value, produce test in test point
Required voltage falls specification, and test voltage falls whether specification meets the requirements；
S4：According to the test voltage specification in step S3, no load test and load testing is carried out；
S5：After the completion of test, collect test and assessment result.
2. it is according to claim 1 consider phase hit low voltage ride through capacity of wind generating set method of testing, its
It is characterised by：Step S1 is implemented as follows,
S11：Replace the short-circuit reactance in existing sag generator with adjustable short-circuit impedance, or go here and there after short-circuit reactance
Connection adjustable resistance ground connection；
S12：On the basis of testing the electric network impedance angle that blower fan accesses electrical network, with reference to grid entry point voltage magnitude and phase hit angle
Corresponding relation, calculate proper phase saltus step angle, and calculate the saltus step angle value of each phase voltage according to fault type, it is determined that
Consider the Voltage Drop specification of phase hit.
3. it is according to claim 1 consider phase hit low voltage ride through capacity of wind generating set method of testing, its
It is characterised by：Step S2 is implemented as follows,
S21：Each position of the switch is checked, capacity of short circuit test is carried out, and the net capacity of low voltage crossing test point is set as wind-powered electricity generation
More than 3 times of unit rated capacity；
S22：Required according to capacity of short circuit value, it is determined that series connection current-limiting impedance value scope.
4. it is according to claim 2 consider phase hit low voltage ride through capacity of wind generating set method of testing, its
It is characterised by：Step S3 is implemented as follows,
S31：By the current-limiting reactor resistance determined in step S2, short-circuit impedance resistance is calculated；
A, by the current-limiting reactor X determined in step S2srResistance Xsr1, and system impedance Z entered from from the point of view of test device accesssr0,
System impedance Z of short dot is obtained by following formulasr：
Zsr=Zsr0+Xsr1=Rsr+jXsr (1)
In formula, RsrFor the resistance value of short dot system impedance, XsrFor the reactance value of short dot system impedance；
The short-circuit impedance value that b, test need is represented by
Zsc=Rsc+jXsc (2)
In formula, RscFor the resistance value of short-circuit impedance, XscFor the reactance value of short-circuit impedance；
By formula (2) and following formula (3), each phase voltage obtained with reference to step S12 falls amplitude UxWith the phase hit angle of each phaseShort-circuit impedance value can be tried to achieve, wherein x represents a, b, c three-phase respectively；
S32：Improved voltage sag generator series connection is entered into Wind turbines step-up transformer high-pressure side, by step S31
Result of calculation, adjusts each phase short-circuit impedance value in voltage sag generator, produces the voltage of meter and phase hit in grid entry point
Fall；
S33：Whether detection grid entry point Voltage Drop specification meets the requirements.
5. it is according to claim 1 consider phase hit low voltage ride through capacity of wind generating set method of testing, its
It is characterised by：Step S4 is implemented as follows,
S41：No load test is carried out, test data is recorded；
S42：In the case where test point capacity of short circuit and no load test result meet requirement, load testing, record test is carried out
Data.
6. it is according to claim 1 consider phase hit low voltage ride through capacity of wind generating set method of testing, its
It is characterised by：Step S5 is implemented as follows,
S51：Collect and process test data；
S52：Required according to low voltage ride-through capability of wind turbine generator system, assess test result.
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