CN106610471B - A kind of offshore wind farm unit fault traversing test method for considering sea cable and influencing - Google Patents
A kind of offshore wind farm unit fault traversing test method for considering sea cable and influencing Download PDFInfo
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Abstract
The present invention provides a kind of offshore wind farm unit fault traversing test methods that consideration sea cable influences, including step 1: determining the test point of Wind turbines fault traversing test；Step 2: carrying out sea cable influences test；Step 3: the test data for influencing test according to sea cable calculates sea cable influence coefficient；Step 4: fault traversing test is carried out to Wind turbines；Step 5: the fault traversing index of the test data calculating Wind turbines of coefficient and fault traversing test is influenced according to sea cable.Compared with prior art, a kind of offshore wind farm unit fault traversing test method for considering sea cable and influencing provided by the invention, eliminates the influence that sea cable tests fault traversing, can earn the fault traversing characteristic index that volume embodies offshore wind farm unit.
Description
Technical field
The present invention relates to new energy access and control fields, and in particular to a kind of offshore wind farm unit for considering sea cable and influencing
Fault traversing test method.
Background technique
Wind-power electricity generation as renewable energy develop in technology it is most mature, most before scale development and commercialized development
One of generation mode of scape, since it is mitigating environmental pollution, is readjusting the energy structure, solves the problems, such as remote districts residential electricity consumption etc.
The outstanding role of aspect, increasingly by countries in the world attention and obtained extensive development and application.
Offshore wind farm is that current wind-powered electricity generation industry is with fastest developing speed, technical level highest, a most wide developing direction of prospect.
According to the prediction of European Wind Energy Association, it is up to the capacity of 40GW to the year two thousand twenty Europe offshore wind farm, European Union 4% can be provided
Electricity needs；The offshore wind farm development plan of the year two thousand twenty 10GW, the year two thousand thirty 54GW are just being realized in coordinated planning in the U.S..It is following marine
The development of wind-powered electricity generation will presentation single-machine capacity be big, offshore distance is remote, average water is deep, need to build maritime transformer station and multiple offshore wind farms
The characteristics of field cluster is sent out, the future of global Wind Power Development is at sea.
With the large-scale development of China's wind energy on the sea, influence of the offshore wind farm to power grid will be increasing.Offshore wind farm
It is connected between unit and booster stations using submarine cable, sends out mode by the way of direct current or alternating current-direct current mixed connection, using traditional straight
The offshore wind farm streamed out, the harmonic wave that the switching frequency of converter station large-capacity power electronic device generates will lead to Wind turbines
Increasingly complex electric circumstance is operated in, its safe and stable operation is put forward higher requirements；Marine wind electric field capacity is larger, and
It generallys use cluster and sends out mode, it is desirable that blower must have low voltage ride-through capability, since offshore wind farm submitting cable is usual
Up to kilometers tens of or up to a hundred, charge idle larger, to Wind turbines fault traversing test method, more stringent requirements are proposed.
Maritime meteorological complicated condition, difficulty of construction is big, and fan operation maintenance cost is high, and the period is long.Therefore, it at sea opens
The detection work difficulty for opening up offshore wind farm unit is larger, is limited by traffic condition, 5MW and the above capacity offshore wind farm unit are difficult
It is detected by land, and land is not also had the environmental characteristics such as marine high salt fog, highly corrosive.
Since current test device is difficult to adapt to marine running environment, fault traversing energy is carried out to offshore wind farm unit
Power test, test point is selected in coastal land, is connected to tested Wind turbines by sea cable.It, will since the sea cable of long range exists
Certain influence can be generated to test result.
Accordingly, it is desirable to provide a kind of be directed to current offshore wind farm unit fault traversing detectability problem, sea cable pair is considered
The offshore wind farm unit fault traversing test method of the influence of test result.
Summary of the invention
In order to meet the needs of the prior art, the present invention provides a kind of offshore wind farm unit failures that consideration sea cable influences
Pass through test method.
The technical scheme is that
The Wind turbines access sea cable by Wind turbines step-up transformer, and the other end of the sea cable passes through fault traversing
Device accesses wind power plant step-up transformer, which comprises
Step 1: determine Wind turbines fault traversing test test point, the test point include at least the first test point,
Second test point, third test point and the 4th test point；First test point is arranged in fault traversing device and wind power plant liter
Between pressure transformer, the second test point is arranged in the sea cable of fault traversing device side, and third test point is arranged in Wind turbines
In the sea cable of step-up transformer side, the 4th test point is arranged between Wind turbines and Wind turbines step-up transformer；
Step 2: carrying out sea cable influences test；
Step 3: the test data for influencing test according to the sea cable calculates sea cable influence coefficient；
Step 4: fault traversing test is carried out to Wind turbines；
Step 5: the test data for influencing coefficient and fault traversing test according to the sea cable calculates Wind turbines
Fault traversing index.
Preferably, carrying out sea cable in the step 2 influences test including unloaded fault test and with sea cable fault test；Institute
It is identical with the duration of failure to state unloaded fault test and the voltage failure type with sea cable fault test, fault amplitudes；
The zero load fault test includes: to disconnect the fault traversing device and sea cable, to the fault traversing device into
Row zero load short-circuit test, obtains the unloaded short-circuit test data of the second test point；
The band sea cable fault test includes: to connect the fault traversing device with sea cable and Wind turbines are placed in shutdown
State carries out unloaded short-circuit test to the fault traversing device, obtains the zero load short circuit examination of the second test point and third test point
Test data；
Preferably, sea cable influence coefficient is calculated in the step 3 includes:
Step 31: influencing the test data of unloaded fault test in test according to the sea cable, it is effective to obtain voltage fundamental
It is worth curve；The network voltage of the second test point when Wind turbines operate normally is obtained according to the voltage fundamental virtual value curve
Un21And reactive power Qn21And in Wind turbines failure process the second test point network voltage Un22And reactive power Qn22；
Step 32: influencing the test data with sea cable fault test in test according to the sea cable, obtaining voltage fundamental has
Valid value curve；The network voltage of the second test point when Wind turbines operate normally is obtained according to the voltage fundamental virtual value curve
Us21And reactive power Qs21, the network voltage U of third test points31And reactive power Qs31And in Wind turbines failure process
The network voltage U of second test points22And reactive power Qs22, the network voltage U of third test points32And reactive power Qs32；
Step 33: calculating sea cable according to the test data of the second test point and third test point influences coefficient, comprising:
The voltage influence COEFFICIENT K of first test pointU1, KU1=Us21/Un21；
The reactive power of first test point influences COEFFICIENT KQ1, KQ1=Qs21-Qn21；
The voltage influence COEFFICIENT K of second test pointU2, KU2=Us22/Un22；
The reactive power of second test point influences COEFFICIENT KQ2, KQ2=Qs22-Qn22；
The voltage influence COEFFICIENT K of third test pointU3, KU3=Us31/Un21；
The reactive power of third test point influences COEFFICIENT KQ3, KQ3=Qs31-Qn21；
The voltage influence COEFFICIENT K of 4th test pointU4, KU4=Us32/Un22；
The reactive power of 4th test point influences COEFFICIENT KQ4, KQ4=Qs32-Qn22；
Preferably, carrying out fault traversing test to Wind turbines in the step 4 includes:
The wind power plant step-up transformer is accessed into power grid, is obtained the when Wind turbines operate normally under loading condition respectively
Second test point and third test point in the test data and Wind turbines failure process of two test points and third test point
Test data；
Preferably, the fault traversing index of calculating Wind turbines includes: in the step 5
Step 51: voltage and nothing when being operated normally according to Wind turbines under the conditions of sea cable influence coefficient computational load
Function power and voltage and reactive power in Wind turbines failure process；
Step 52: the Voltage Drop depth during Wind turbines fault traversing is judged according to above-mentioned voltage and reactive power
And reactive power；
Preferably, the step 51 includes:
Work as Us21-Un21< Us31-Un21When, under the conditions of the test data computational load of the second test point:
Voltage U when Wind turbines operate normally1r, U1r=U11/KU1And reactive power Q1r, Q1r=KQ1+Q11；
Voltage U in Wind turbines failure process2r, U2r=U12/KU2And reactive power Q2r, Q2r=KQ2+Q12；
Work as Us21-Un21≥Us31-Un21When, under the conditions of the test data computational load of third test point:
Voltage U when Wind turbines operate normally1r, U1r=U21/KU3And reactive power Q1r, Q1r=KQ3+Q21；
Voltage U in Wind turbines failure process2r, U2r=U22/KU4And reactive power Q2r, Q2r=KQ4+Q22；
Wherein, U11And Q11The voltage and reactive power of second test point, U when respectively Wind turbines operate normally12And Q12
The voltage and reactive power of the second test point respectively in Wind turbines failure process；
U21And Q21The voltage and reactive power of second test point, U when respectively Wind turbines operate normally22And Q22Respectively
For the voltage and reactive power of the second test point in Wind turbines failure process；
KU1、KU2、KU3、KU4、KQ1、KQ2、KQ3And KQ4It is that sea cable influences coefficient.
Compared with the immediate prior art, the excellent effect of the present invention is that:
1, a kind of offshore wind farm unit fault traversing test method for considering sea cable and influencing provided by the invention, using comprehensive
Test point, it can be deduced that the influence coefficient that sea cable tests Wind turbines fault traversing, and then obtain more accurate failure
Pass through index；
2, a kind of offshore wind farm unit fault traversing test method for considering sea cable and influencing provided by the invention, passes through scene
Test data show that sea cable influences coefficient, and influences coefficient according to sea cable and exclude sea cable influence, to more be accurately obtained whole
Parameter index in a failure process.
Detailed description of the invention
The following further describes the present invention with reference to the drawings.
Fig. 1: offshore wind farm unit fault traversing test schematic in the embodiment of the present invention；
Fig. 2: offshore wind farm unit fault traversing test point distribution map in the embodiment of the present invention；
Fig. 3: fault traversing structure drawing of device in the embodiment of the present invention；
Fig. 4: the voltage oscillogram of unloaded fault test in the embodiment of the present invention；
Fig. 5: the reactive power waveform diagram of unloaded fault test in the embodiment of the present invention；
Fig. 6: the voltage oscillogram with the second test point of sea cable fault test in the embodiment of the present invention；
Fig. 7: the reactive power waveform diagram with the second test point of sea cable fault test in the embodiment of the present invention；
Fig. 8: the voltage oscillogram with sea cable fault test third test point in the embodiment of the present invention；
Fig. 9: the reactive power waveform diagram with sea cable fault test third test point in the embodiment of the present invention.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
A kind of offshore wind farm unit fault traversing test method for considering sea cable and influencing provided by the invention, the test of use
Principle mainly includes the technical requirements and equipment requirement of fault traversing device.Wherein,
1, the technical requirements of fault traversing device
Using standard GB/T 19963-2011 " Wind turbines access power system technology regulation " to wind-powered electricity generation in the present embodiment
Field low voltage crossing makes requirement.Main contents are as follows: the Wind turbines in wind power plant, which have, falls to 20% volume in grid entry point voltage
It can guarantee the ability of not off-grid continuous operation 625ms when constant voltage；Wind farm grid-connected voltage energy in 2s after breaking down
When being enough restored to the 90% of voltage rating, the Wind turbines in wind power plant can guarantee not off-grid continuous operation.
Dynamic reactive enabling capabilities, when three phase short circuit fault, which occurs, for electric system causes voltage failure, each wind power plant
There should be following dynamic reactive enabling capabilities during low voltage crossing:
1.: when wind farm grid-connected voltage is in 20%~90% section of nominal voltage, wind power plant should be able to lead to
Injecting reactive current support voltage is crossed to restore；From at the time of grid entry point voltage failure occurs, the sound of dynamic reactive current control
It is not more than 75ms between seasonable, the duration should be no less than 550ms.
2.: the dynamic reactive electric current I of wind power plant injection electric systemT≥1.5×(0.9-UT)IN, (0.2 < UT< 0.9)
In formula: UT--- wind farm grid-connected voltage per unit value；IN--- wind power plant rated current.
2, the equipment requirement of fault traversing device
Network voltage failure is caused by electric network fault.Electric network fault has uncontrollability, the low-voltage of practical Wind turbines
Passing through characteristic can not be tested by the true fault of power grid.Therefore there must be special equipment, the electricity of needs can be generated
Failure is pressed, and the normal safe operation of power grid cannot be influenced, for testing the low voltage crossing characteristic of Wind turbines.
The present embodiment ability impedance divided voltage failure generating device shown in Fig. 3 passes through in parallel in main circuit or string
Join resistance/reactance and realize voltage failure, i.e., expected from the appropriate matching generation by impedance 1, impedance 2 and Wind turbines impedance
Voltage failure.
The embodiment of the offshore wind farm unit fault traversing test method provided by the invention for considering sea cable influence, is pressed first
According to shown in Fig. 1 by Wind turbines, Wind turbines step-up transformer, sea cable, fault traversing device and wind power plant step-up transformer according to
Secondary connection, the specific steps of the embodiment are as follows:
1, the test point of Wind turbines fault traversing test is determined.
Influence in the present embodiment due to sea cable to offshore wind farm unit fault traversing test result, the influence of face sea cable
According to arranging test point shown in Fig. 2.Wherein, test point should include at least the three-phase voltage and three of fault traversing device end of incoming cables
Phase current, sea cable is adjacent to the three-phase voltage and three-phase current of fault traversing device end, and sea cable is adjacent to Wind turbines step-up transformer
The three-phase voltage and three-phase current of on high-tension side three-phase voltage and three-phase current and Wind turbines step-up transformer low voltage side.
As shown in Fig. 2, the test point includes at least the first test point, the second test point, third test point and the 4th test
Point:
First test point is arranged between fault traversing device and wind power plant step-up transformer；
Second test point is arranged in the sea cable of fault traversing device side；
Third test point is arranged in the sea cable of Wind turbines step-up transformer side；
4th test point is arranged between Wind turbines and Wind turbines step-up transformer.
2, carrying out sea cable influences test.
Carrying out sea cable in the present embodiment influences test including unloaded fault test and with sea cable fault test.
(1) unloaded fault test
Fault traversing device and sea cable are disconnected, unloaded short-circuit test is carried out to the fault traversing device, second is obtained and surveys
The unloaded short-circuit test data of pilot.
(2) band sea cable fault test
Fault traversing device is connect with sea cable and Wind turbines are placed in shutdown status, which is carried out empty
Short-circuit test is carried, the unloaded short-circuit test data of the second test point and third test point are obtained.
Unloaded fault test and voltage failure type with sea cable fault test, fault amplitudes and failure in the present embodiment
Duration is identical.Such as fault type can be three-phase symmetrical failure or two-phase unbalanced fault etc., fault amplitudes can be with
90%Un, 75%Un, 50%Un, 35%Un, 20%Un, the duration of different faults can be 2000ms, 1705ms,
1214ms,920ms,625ms.It wherein, is Un voltage rating.
3, the test data for influencing test according to sea cable, which calculates sea cable, influences coefficient.
(1) test data that unloaded fault test in test is influenced according to sea cable, obtains voltage fundamental virtual value curve；According to
The network voltage U of the second test point when Wind turbines operate normally is obtained according to voltage fundamental virtual value curven21And reactive power
Qn21And during voltage failure the second test point network voltage Un22And reactive power Qn22。
Voltage and reactive power in the present embodiment before voltage failure are voltage when Wind turbines operate normally and idle
Power, voltage and reactive power in voltage failure are voltage and reactive power in Wind turbines failure.
(2) test data with sea cable fault test in test is influenced according to sea cable, obtains voltage fundamental virtual value curve；
The network voltage U of the second test point when Wind turbines operate normally is obtained according to voltage fundamental virtual value curves21And reactive power
Qs21, the network voltage U of third test points31And reactive power Qs31And during voltage failure the second test point power grid electricity
Press Us22And reactive power Qs22, the network voltage U of third test points32And reactive power Qs32。
(3) calculating sea cable according to the test data of the second test point and third test point influences coefficient, comprising:
The voltage influence COEFFICIENT K of first test pointU1, KU1=Us21/Un21；The reactive power of first test point influences coefficient
KQ1, KQ1=Qs21-Qn21。
The voltage influence COEFFICIENT K of second test pointU2, KU2=Us22/Un22；The reactive power of second test point influences coefficient
KQ2, KQ2=Qs22-Qn22。
The voltage influence COEFFICIENT K of third test pointU3, KU3=Us31/Un21；The reactive power of third test point influences coefficient
KQ3, KQ3=Qs31-Qn21。
The voltage influence COEFFICIENT K of 4th test pointU4, KU4=Us32/Un22；The reactive power of 4th test point influences coefficient
KQ4, KQ4=Qs32-Qn22。
4, fault traversing test is carried out to Wind turbines.
Wind power plant step-up transformer is accessed into power grid, obtains the second survey when Wind turbines operate normally under loading condition respectively
The test of second test point and third test point in the test data and Wind turbines failure process of pilot and third test point
Data.
5, the failure that the test data for influencing fault traversing test in coefficient and step 4 according to sea cable calculates Wind turbines is worn
More index.
1, voltage and reactive power when being operated normally according to Wind turbines under the conditions of sea cable influence coefficient computational load, with
And voltage and reactive power in Wind turbines failure process.
(1) work as Us21-Un21< Us31-Un21When, under the conditions of the test data computational load of the second test point:
1.: voltage U when Wind turbines operate normally1r, U1r=U11/KU1And reactive power Q1r, Q1r=Q11-KQ1；
2.: the voltage U in Wind turbines failure process2r, U2r=U12/KU2And reactive power Q2r, Q2r=Q12-KQ2；
(2) work as Us21-Un21≥Us31-Un21When, under the conditions of the test data computational load of third test point:
1.: voltage U when Wind turbines operate normally1r, U1r=U21/KU3And reactive power Q1r, Q1r=Q21-KQ3；
2.: the voltage U in Wind turbines failure process2r, U2r=U22/KU4And reactive power Q2r, Q2r=Q22-KQ4；
Wherein, U11And Q11The voltage and reactive power of second test point, U when respectively Wind turbines operate normally12And Q12
The voltage and reactive power of the second test point respectively in Wind turbines failure process；U21And Q21Respectively Wind turbines are being just
The voltage and reactive power of second test point, U when often running22And Q22The second test respectively in Wind turbines failure process
The voltage and reactive power of point；KU1、KU2、KU3、KU4、KQ1、KQ2、KQ3And KQ4It is that sea cable influences coefficient.
2, the Voltage Drop depth and nothing during Wind turbines fault traversing are judged according to above-mentioned voltage and reactive power
Function power.
The offshore wind farm unit failure after considering sea cable influence is introduced in the present invention by taking the fault amplitudes of 50%Un as an example to wear
The more calculating process of index:
1, carrying out sea cable influences test
As shown in Figures 4 and 5, the voltage of the second test point when the Wind turbines that unloaded fault test obtains operate normally is carried out
Un21=20518V, reactive power Qn21The voltage U of second test point in=- 0.6kvar and Wind turbines failure processn22=
10209V, reactive power Qn22=0var.
As shown in Figures 6 and 7, the electricity of the second test point when the Wind turbines for carrying out obtaining with sea cable fault test operate normally
Press Us21=: 21326V, reactive power Qs21The voltage U of second test point in=908kvar and Wind turbines failure processs22
=10401V, reactive power Qs22=220kvar.
As shown in FIG. 8 and 9, the electricity of third test point when the Wind turbines for carrying out obtaining with sea cable fault test operate normally
Press Us31=: 21341V, reactive power Qs31The voltage U of third test point in=- 36kvar and Wind turbines failure processs32
=10408V, reactive power Qs32=-6kvar.
2, the test data for influencing test according to sea cable, which calculates sea cable, influences coefficient
Due to Us21-Un21< Us31-Un21, then calculating sea cable according to the test data of the second test point influences COEFFICIENT KU1=
1.04 KQ1=908.6, KU2=1.02, KQ2=220.
3, fault traversing test is carried out to Wind turbines
Wind turbines active power of output is about 450kW when test, and voltage is U when normal operation11=21343kV, it is idle
Power is Q11=875kvar, voltage is U in failure process12=11592kV, reactive power Q12=1643kvar.
4, the failure that the test data for influencing fault traversing test in coefficient and step 3 according to sea cable calculates Wind turbines is worn
More index.
Voltage is U when normal operation1r=U11/KU1=20522kV, reactive power Q1r=Q11-KQ1=-33.6kvar,
Voltage is U in failure process2r=U12/KU2=11364kV, reactive power Q2r=Q12-KQ2=1423kvar.
Finally it should be noted that: described embodiment is only some embodiments of the present application, rather than whole realities
Apply example.Based on the embodiment in the application, this field is composed logical technical staff and is obtained without making creative work
Every other embodiment, shall fall in the protection scope of this application.
Claims (4)
1. a kind of offshore wind farm unit fault traversing test method for considering sea cable and influencing, the Wind turbines pass through Wind turbines
Step-up transformer accesses sea cable, and the other end of the sea cable accesses wind power plant step-up transformer, feature by fault traversing device
It is, which comprises
Step 1: determining that the test point of Wind turbines fault traversing test, the test point include at least the first test point, second
Test point, third test point and the 4th test point；The first test point setting becomes in fault traversing device and wind power plant boosting
Between depressor, the second test point is arranged in the sea cable of fault traversing device side, and the setting of third test point is boosted in Wind turbines
In the sea cable of transformer side, the 4th test point is arranged between Wind turbines and Wind turbines step-up transformer；
Step 2: carrying out sea cable influences test；
Step 3: the test data for influencing test according to the sea cable calculates sea cable influence coefficient；
Step 4: fault traversing test is carried out to Wind turbines；
Step 5: the failure of the test data calculating Wind turbines of coefficient and fault traversing test is influenced according to the sea cable
Pass through index；
Carrying out sea cable in the step 2 influences test including unloaded fault test and with sea cable fault test；The zero load failure
It tests identical with the duration of failure with the voltage failure type with sea cable fault test, fault amplitudes；The zero load failure
Test includes: to disconnect the fault traversing device and sea cable, carries out unloaded short-circuit test to the fault traversing device, obtains the
The unloaded short-circuit test data of two test points；
The band sea cable fault test includes: to connect the fault traversing device with sea cable and Wind turbines are placed in shutdown shape
State carries out unloaded short-circuit test to the fault traversing device, obtains the unloaded short-circuit test of the second test point and third test point
Data；
Sea cable influence coefficient is calculated in the step 3 includes:
Step 31: influencing the test data of unloaded fault test in test according to the sea cable, it is bent to obtain voltage fundamental virtual value
Line；The network voltage U of the second test point when Wind turbines operate normally is obtained according to the voltage fundamental virtual value curven21With
Reactive power Qn21And in Wind turbines failure process the second test point network voltage Un22And reactive power Qn22；
Step 32: influencing the test data with sea cable fault test in test according to the sea cable, obtain voltage fundamental virtual value
Curve；The network voltage U of the second test point when Wind turbines operate normally is obtained according to the voltage fundamental virtual value curves21
And reactive power Qs21, the network voltage U of third test points31And reactive power Qs31And second in Wind turbines failure process
The network voltage U of test points22And reactive power Qs22, the network voltage U of third test points32And reactive power Qs32；
Step 33: calculating sea cable according to the test data of the second test point and third test point influences coefficient, comprising:
The voltage influence COEFFICIENT K of first test pointU1, KU1=Us21/Un21；
The reactive power of first test point influences COEFFICIENT KQ1, KQ1=Qs21-Qn21；
The voltage influence COEFFICIENT K of second test pointU2, KU2=Us22/Un22；
The reactive power of second test point influences COEFFICIENT KQ2, KQ2=Qs22-Qn22；
The voltage influence COEFFICIENT K of third test pointU3, KU3=Us31/Un21；
The reactive power of third test point influences COEFFICIENT KQ3, KQ3=Qs31-Qn21；
The voltage influence COEFFICIENT K of 4th test pointU4, KU4=Us32/Un22；
The reactive power of 4th test point influences COEFFICIENT KQ4, KQ4=Qs32-Qn22。
2. a kind of offshore wind farm unit fault traversing test method for considering sea cable and influencing as described in claim 1, feature
It is, carrying out fault traversing test to Wind turbines in the step 4 includes:
The wind power plant step-up transformer is accessed into power grid, obtains the second survey when Wind turbines operate normally under loading condition respectively
The test of second test point and third test point in the test data and Wind turbines failure process of pilot and third test point
Data.
3. a kind of offshore wind farm unit fault traversing test method for considering sea cable and influencing as described in claim 1, feature
It is, the fault traversing index that Wind turbines are calculated in the step 5 includes:
Step 51: voltage and idle function when being operated normally according to Wind turbines under the conditions of sea cable influence coefficient computational load
Rate and voltage and reactive power in Wind turbines failure process；
Step 52: the Voltage Drop depth and nothing during Wind turbines fault traversing are judged according to above-mentioned voltage and reactive power
Function power.
4. a kind of offshore wind farm unit fault traversing test method for considering sea cable and influencing as claimed in claim 3, feature
It is, the step 51 includes:
Work as Us21-Un21< Us31-Un21When, under the conditions of the test data computational load of the second test point:
Voltage U when Wind turbines operate normally1r, U1r=U11/KU1And reactive power Q1r, Q1r=KQ1+Q11；
Voltage U in Wind turbines failure process2r, U2r=U12/KU2And reactive power Q2r, Q2r=KQ2+Q12；
Work as Us21-Un21≥Us31-Un21When, under the conditions of the test data computational load of third test point:
Voltage U when Wind turbines operate normally1r, U1r=U21/KU3And reactive power Q1r, Q1r=KQ3+Q21；
Voltage U in Wind turbines failure process2r, U2r=U22/KU4And reactive power Q2r, Q2r=KQ4+Q22；
Wherein, U11And Q11The voltage and reactive power of second test point, U when respectively Wind turbines operate normally12And Q12Respectively
For the voltage and reactive power of the second test point in Wind turbines failure process；
U21And Q21The voltage and reactive power of third test point, U when respectively Wind turbines operate normally22And Q22Respectively wind
The voltage and reactive power of third test point in motor group failure process；
KU1、KU2、KU3、KU4、KQ1、KQ2、KQ3And KQ4It is that sea cable influences coefficient.
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