CN108344943A - A kind of DFIG low voltage ride-through testing methods and device - Google Patents
A kind of DFIG low voltage ride-through testing methods and device Download PDFInfo
- Publication number
- CN108344943A CN108344943A CN201810024410.8A CN201810024410A CN108344943A CN 108344943 A CN108344943 A CN 108344943A CN 201810024410 A CN201810024410 A CN 201810024410A CN 108344943 A CN108344943 A CN 108344943A
- Authority
- CN
- China
- Prior art keywords
- starting point
- low voltage
- waveform starting
- serious
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The embodiment of the present application discloses a kind of DFIG low voltage ride-through testing methods and device, including：The method of determination for obtaining the waveform starting point that under different faults type Wind turbines are influenced with most serious, obtains the waveform starting point expression formula for making rotor voltage amplification most serious；According to the waveform starting point expression formula and grid entry point voltage dip feature, the calculation formula of most serious waveform starting point is determined；Using the calculation formula, obtains and consider that waveform starting point and grid entry point temporarily drop the low voltage crossing test voltage of feature and temporarily drop specification；Specification is temporarily dropped according to the low voltage crossing test voltage, low voltage crossing test is carried out to DFIG.The application determines the waveform starting point expression formula of voltage amplification most serious first, and considers grid entry point voltage dip feature, and then obtains low voltage crossing test voltage and temporarily drop specification, so as to more accurately assess the low voltage ride-through capability of DFIG.
Description
Technical field
This application involves LVRT Capability of Wind Turbine Generator technical field of measurement and test more particularly to a kind of DFIG low voltage crossings to survey
Method for testing and device.
Background technology
With the continuous increase of Wind Power In China installed capacity, the intermittence and uncertainty of wind-powered electricity generation are to electric power netting safe running
Influence increasingly shows.It is incorporated into the power networks mode to the receiving ability of wind-powered electricity generation, specification Wind turbines to promote power grid, countries in the world are successively
Corresponding wind-electricity integration access directive/guide is formulated and put into effect, the safety and stability of running of wind generating set is proposed stringent
It is required that main including not off-grid continuous operation, reactive power support, optimization operation etc..
Most common doubly fed induction generator (DFIG, Double-Fed Induction in grid connected wind power unit at present
Generator) because of its stator and rotor topological structure grid-connected simultaneously, and using low cost, the original of low capacity rotor-side converter
Cause, low voltage ride-through capability have become one of the focus of wind-electricity integration technical concerns.Existing low voltage ride-through capability test rule
Only defined in journey temporary decline and temporarily drop the duration, not to failure when waveform starting point selection make clear stipulaties.
When physical fault, the waveform starting point of fault moment will occur simultaneously with wind-electricity integration point voltage after randomness and failure
Amplitude declines and phase angle change.Under different temporarily drop types, influence journey of the different wave starting point to unit transient characterisitics after failure
Degree is different.Under specific fault type, the waveform starting point of most serious is influenced simultaneously by voltage dip amplitude, power grid on unit
The influence of impedance angle, voltage-phase saltus step angle.Voltage dip specification is only advised specified in existing low voltage crossing testing standard
Temporary decline and the duration of failure are determined, the waveform starting point for failure not occurring the moment makes clear stipulaties.Meanwhile
Although temporarily dropping generating means using impedance partial pressure type, voltage magnitude and phase after failure can be changed by adjusting short-circuit impedance value
Angle, but regulation is not made to phase hit in test voltage specification, waveform starting point and phase hit angle are not also considered
Joint effect.
Low voltage crossing is considered as the influence of waveform starting point when testing, jumped to the waveform starting point and phase of fault moment
Varied angle makes clear stipulaties.The existing low voltage crossing test content of waveform starting point is not considered, it is impossible to which reflection is real completely
When occurring in the power grid of border with test under identical temporary decline and the fault condition of duration, Wind turbines can suffer from most
Serious transient response process.The influence for not considering fault waveform point starting point factor when such as testing, has passed through the wind of existing test
Motor group, during being actually incorporated into the power networks, it would still be possible to the case where low voltage crossing failure occur.
Invention content
This application provides a kind of DFIG low voltage ride-through testing methods and devices, to solve traditional low voltage test side
Method tests the problem of doubly fed induction generator low voltage ride-through capability inaccuracy.
In order to solve the above-mentioned technical problem, the embodiment of the present application discloses following technical solution：
A kind of DFIG low voltage ride-through testing methods, the method includes：It obtains under different faults type to Wind turbines
The method of determination for influencing the waveform starting point of most serious, obtains making the waveform starting point of rotor voltage amplification most serious to express
Formula；According to the waveform starting point expression formula and grid entry point voltage dip feature, determine that the calculating of most serious waveform starting point is public
Formula；Using the calculation formula, obtain consider waveform starting point and grid entry point temporarily drop feature low voltage crossing test voltage it is temporary
Specification drops；Specification is temporarily dropped according to the low voltage crossing test voltage, low voltage crossing test is carried out to DFIG.
Optionally, the determination for obtaining the waveform starting point that under different faults type Wind turbines are influenced with most serious
Mode obtains the waveform starting point expression formula for making rotor voltage amplification most serious, including：According to the event for influencing most serious on DFIG
Hinder type and the requirement of existing low voltage crossing standard, determines the fault type used when test；According to waveform starting point to failure
The affecting laws of DFIG rotors open-circuit voltage afterwards determine that the waveform for influencing most serious under different faults type on DFIG units originates
The determination method of point；Being derived from influences unit the waveform starting point expression formula of most serious.
Optionally, described according to the waveform starting point expression formula and grid entry point voltage dip feature, determine most serious wave
The calculation formula of shape starting point, including：Determine that calculating most serious waveform starting point need to examine according to the waveform starting point expression formula
The temporary drop characteristic quantity considered；Determine that each variable correspondence and value in temporarily drop characteristic quantity, the variable include：Electric network impedance angle,
Temporary decline, phase hit angle and trouble duration；It is determined according to each variable correspondence and value in temporary drop characteristic quantity
The calculation formula of most serious waveform starting point.
Optionally, described to use the calculation formula, obtain the low electricity for considering that feature temporarily drops in waveform starting point and grid entry point
It presses to wear more test voltage and temporarily drops specification, including：Determine the temporary decline and trouble duration when test；Using waveform starting point
Computational methods, the temporary decline of determination and duration, calculate corresponding phase hit angle and on DFIG units influence most
Serious waveform starting point；It determines and considers that feature temporarily drops in grid entry point and specification temporarily drops in the test voltage of waveform starting point.
Optionally, described that specification is temporarily dropped according to low voltage crossing test voltage, low voltage crossing test, packet are carried out to DFIG
It includes：According to the determining voltage dip specification of low voltage crossing test, the regulative mode of temporarily drop generating means is determined；Using low-voltage
Testing standard requirement is passed through, low voltage crossing test is carried out.
A kind of DFIG low voltage crossings test device, described device include：First acquisition module, for obtaining different faults
The method of determination that under type Wind turbines are influenced with the waveform starting point of most serious, obtains making rotor voltage amplification most serious
Waveform starting point expression formula；Determining module is used for according to the waveform starting point expression formula and grid entry point voltage dip feature, really
Determine the calculation formula of most serious waveform starting point；Second acquisition module obtains for using the calculation formula and considers that waveform rises
Specification temporarily drops in the low voltage crossing test voltage that feature temporarily drops in initial point and grid entry point；Test module, for according to the low-voltage
It passes through test voltage and temporarily drops specification, low voltage crossing test is carried out to DFIG.
Optionally, first acquisition module includes：First determination unit, for according to the event for influencing most serious on DFIG
Hinder type and the requirement of existing low voltage crossing standard, determines the fault type used when test；Second determination unit is used for basis
To the affecting laws of DFIG rotors open-circuit voltage after failure, determine influences DFIG units under different faults type waveform starting point
The determination method of the waveform starting point of most serious；Acquiring unit, for being derived from the waveform starting for influencing most serious on unit
Point expression formula.
Optionally, the determining module includes：First computing unit, for being determined according to the waveform starting point expression formula
Calculate the temporary drop characteristic quantity that most serious waveform starting point need to consider；Third determination unit respectively becomes for determining in temporarily drop characteristic quantity
Amount correspondence and value, the variable include：Electric network impedance angle, temporary decline, phase hit angle and trouble duration；
4th determination unit, by being determined based on most serious waveform starting point according to each variable correspondence and value in temporarily drop characteristic quantity
Calculation method.
Optionally, second acquisition module includes：5th determination unit, temporary decline when being tested for determining and event
Hinder the duration；Second computing unit, for using the computational methods of waveform starting point, the temporary decline of determination and it is lasting when
Between, it calculates corresponding phase hit angle and influences the waveform starting point of most serious on DFIG units；6th determination unit, is used for
It determines and considers that feature temporarily drops in grid entry point and specification temporarily drops in the test voltage of waveform starting point.
Optionally, the test module includes：7th determination unit, according to the determining voltage dip of low voltage crossing test
Specification determines the regulative mode of temporarily drop generating means；Test cell, for using the requirement of low voltage crossing testing standard, carrying out
Low voltage crossing is tested.
As seen from the above technical solution, a kind of DFIG low voltage ride-through testing methods and dress provided by the embodiments of the present application
It sets, including：The method of determination for obtaining the waveform starting point that under different faults type Wind turbines are influenced with most serious, is made
The waveform starting point expression formula of rotor voltage amplification most serious；According to the waveform starting point expression formula and grid entry point voltage dip
Feature determines the calculation formula of most serious waveform starting point；Using the calculation formula, obtains and consider waveform starting point and grid-connected
Specification temporarily drops in the low voltage crossing test voltage that feature temporarily drops in point；According to the low voltage crossing test voltage, specification temporarily drops, and it is right
DFIG carries out low voltage crossing test.The application determines the waveform starting point expression formula of voltage amplification most serious first, and examines
Grid entry point voltage dip feature is considered, and then has obtained low voltage crossing test voltage and temporarily drop specification, so as to more accurately
Assess the low voltage ride-through capability of DFIG.
Description of the drawings
In order to illustrate more clearly of the technical solution of the application, letter will be made to attached drawing needed in the embodiment below
Singly introduce, it should be apparent that, for those of ordinary skills, without having to pay creative labor,
Other drawings may also be obtained based on these drawings.
Fig. 1 is the flow diagram of one embodiment of low voltage ride-through testing method provided by the present application；
Fig. 2 is voltage dip polar plot provided by the present application；
Fig. 3 is voltage dip generating means schematic diagram provided by the present application；
Fig. 4 is the schematic diagram of one embodiment of low voltage crossing test device provided by the present application.
Specific implementation mode
The application is described in detail below in conjunction with the accompanying drawings.
It is the flow diagram of one embodiment of DFIG low voltage ride-through testing methods provided by the present application referring to Fig. 1,
As shown in Figure 1, the method includes：
S101 obtains the method for determination for the waveform starting point that under different faults type Wind turbines are influenced with most serious,
Obtain the waveform starting point expression formula for making rotor voltage amplification most serious.
According to the fault type and the requirement of existing low voltage crossing standard for influencing most serious on DFIG, used when determining test
Fault type；The test failure type required in existing low voltage crossing testing standard (NB/T31051-2014) is three-phase
Failure and phase to phase fault, voltage dip divide failure to be 7 types, wherein A classes (three-phase symmetrical) failure and C classes (two-phase is alternate) event
The influence hindered to double fed induction generators is the most serious, and (a) is A classes in voltage dip polar plot such as Fig. 2 under two class failures, Fig. 2
Voltage is temporarily by polar plot under failure, be (b) under C class failures voltage temporarily by polar plot.Therefore it on the basis of A class C class failures, determines
The waveform starting point of most serious is influenced on unit.
According to waveform starting point to the affecting laws of DFIG rotors open-circuit voltage after failure, it is right under different faults type to determine
DFIG units influence the determination method of the waveform starting point of most serious, are derived from the waveform starting point that most serious is influenced on unit
Expression formula.
A) three-phase fault
Under three-phase fault, power grid three-phase voltage amplitude and phase change respectively, and change degree is essentially identical, such as Fig. 2.
Work as t0When A class failures occur for the moment, before failure and after failure wind-electricity integration point three-phase voltage vector can be expressed as formula (1) and
Formula (2)
In formula：ωsFor synchronized angular frequency；ua、ub、ucIndicate that grid entry point voltage vector, subscript 1 and 2 indicate event respectively
Before barrier and after failure；U0Indicate voltage amplitude when normal operation, U2∈ [0,1] indicates voltage magnitude after failure；For failure
Moment waveform starting point,For failure when voltage-phase saltus step angle.
By Wind turbines transient mathematical model, moment after being out of order, stator magnetic linkage expression formula can be derived：
Rotor open-circuit voltage is made of exchange steady-state component and direct current transient state component after failure, and voltage magnitude is bigger, failure
The influence that double-fed changes influence generator group is more serious.By formula (4) it is found that the amplitude of rotor open-circuit voltage is by the temporary range of decrease after failure
Value, phase hit angle and unit operation revolutional slip determine；The waveform starting point of fault moment can only influence stator magnet after failure
The phase of chain and rotor voltage will not impact voltage magnitude.Therefore, under A class failures, random waveform starting can be chosen
Point is tested.For convenience of test, it is proposed that choosing waveform starting point is
B) two-phase phase-to phase fault
Under two-phase phase-to phase fault, by BC to for failure, faulted phase voltage amplitude changes after failure and phase changes
Become, such as Fig. 2.Work as t0When C class failures occur for the moment, wind-electricity integration point three-phase voltage vector can indicate respectively before failure and after failure
For formula (1) and formula (5)
In formula：ωsFor synchronized angular frequency；UbAnd UcRespectively indicate failure after B phases and C phases voltage magnitude,With
Respectively indicate failure before and after B phases and C phases phase hit angle.
According to symmetrical component method, can be calculated before C class failures by formula (1) and formula (5) and grid entry point voltage positive sequence after failure,
Negative phase-sequence vector is：
In formula：U0Indicate voltage amplitude when normal operation, U2Voltage magnitude after expression failure；usfIndicate network voltage
Vector, subscript 1,2 indicate that subscript p, n indicates positive-sequence component and negative sequence component before failure and after failure；For fault moment waveform
Starting point,WithFor failure when BC voltage-phase saltus step angles, θpAnd θnForWhen failure after moment stator voltage
Positive and negative sequence component phase angle.
By Wind turbines transient mathematical model, moment after being out of order can be derived, stator magnetic linkage expression formula is：
By formula (8) it is found that waveform starting point by influence failure after stator magnetic linkage and rotor open-circuit voltage DC component width
Value, and then the fault response characteristics of double fed induction generators group are had an impact.Therefore, it obtains so that stator magnetic linkage is straight after failure
The waveform of flow component minimum originates point value, that is, solves and make formula (9) minimumValue, so that it may obtain under C class failures to double-fed sense
Generating set is answered to influence the waveform starting point of most serious.
Due to formula (9) imaginary part be much larger than real part, can approximate solution formula (9) imaginary part absolute value minimum waveform starting pointValue, can solve：
Therefore, under C class failures, waveform starting point can be chosen according to formula (10) and is tested.
S102 determines that most serious waveform originates according to the waveform starting point expression formula and grid entry point voltage dip feature
The calculation formula of point.
The temporary drop characteristic quantity that calculates most serious waveform starting point and need to consider is determined according to the waveform starting point expression formula；Really
Each variable correspondence and value in fixed temporarily drop characteristic quantity, the variable include：Electric network impedance angle, temporary decline, phase hit
Angle and trouble duration.
By S101 it is found that on the waveform starting point of double-fed induction wind driven generator influence most serious and grid entry point before and after failure
Voltage magnitude is related with phase angle.There are certain correspondences between the temporary decline and phase angle of grid entry point voltage after electric network fault
Relationship.
Wind power plant accesses power grid schematic diagram as shown in figure 3, analyzing grid entry point voltage characteristic：Impedance angle α is failure
Impedance ZFWith system impedance ZSBetween angle, as shown in formula (4), wherein ZS=RS+jXS, ZF=RF+jXF：
A classes are temporarily fallen, and the vector expression of three-phase voltage is after failure：
C classes are temporarily fallen, and three-phase voltage vector expression is after failure：
In formula, v is referred to as the character voltage temporarily dropped, is represented by：
In formula：Relative fault distance lambda=| ZF|/|ZS|；V is referred to as feature amplitude；A classes indicate Arbitrary Fault phase in temporarily dropping
Voltage, temporarily drop then indicates the line voltage between two failure phases to C classes；φ is referred to as proper phase saltus step angle, when impedance angle α=0 °
When, φ=0 °；When α ≠ 0 °, φ ≠ 0 °.
It can be obtained under different electric network impedance angles by formula (12) to (14), Relative fault distance and feature amplitude, proper phase
Further the correspondence between phase hit angle and temporary decline can be obtained in relationship between saltus step angle.
Therefore, by grid entry point voltage dip feature, under determining impedance angle under the premise of α and feature temporary decline V,
The calculation formula of most serious waveform starting point is determined according to each variable correspondence and value in temporary drop characteristic quantity.By
Grid entry point voltage dip feature in most serious waveform starting point calculation formula and step 2 in step 1 can be calculated by formula (14)
Corresponding proper phase saltus step angle；The three-phase voltage that A classes and C classes are temporarily fallen further is calculated by formula (12) and formula (13)
Amplitude and phase angle；Three-phase voltage amplitude and phase angle substitution formula (10) can be acquired C classes temporarily to fall on the wave of unit influence most serious
Shape starting point.
S103 obtains the low voltage crossing for considering that feature temporarily drops in waveform starting point and grid entry point using the calculation formula
Specification temporarily drops in test voltage.
1) according to existing low voltage crossing testing standard, the temporary decline and trouble duration when test are determined.
The existing low voltage crossing test procedure of root, which is made that voltage dip amplitude and duration, to be distinctly claimed, low electricity
It presses to wear shown in the voltage dip specification table 1 used when more test, thus can determine temporary decline and trouble duration.
2) computational methods, the temporary decline of determination and the duration for using waveform starting point calculate corresponding phase and jump
Varied angle and the waveform starting point that most serious is influenced on DFIG units；
A, impedance angle is determined.It is incorporated to the actual conditions of electric system according to test wind turbine, determines electric network impedance angle.Usually exist
Power transmission network, power distribution network and marine wind electric field are respectively 0 °, -20 °, -60 ° through its representative value in subsea AC cable grid connected structure.
B, by table 1 determine 5 feature temporary decline V and step a in determine impedance angle under α and under the premise of, can
Corresponding proper phase saltus step angle φ is calculated by formula (14)；
C, V and φ substitution formulas (12) and formula (13) are calculated into the three-phase voltage amplitude U that A classes and C classes are temporarily fallena、Ub、Uc
And phase angle
D, by Ua、Ub、UcWithSubstitution formula (10) can be acquired to the most tight wave of double-fed induction wind driven generator group
Shape originates point valueThus it can determine the waveform starting point that should be chosen when DFIG low voltage crossings.
3) it determines and considers that feature temporarily drops in grid entry point and specification temporarily drops in the test voltage of waveform starting point.
By in result of calculation filling table 1 in step 2), the test for considering phase hit angle and waveform starting point is determined
Voltage dip specification.
Table 1 considers temporarily to drop the test voltage specification of feature and waveform starting point
S104 temporarily drops specification according to the low voltage crossing test voltage, and low voltage crossing test is carried out to DFIG.
According to the voltage dip specification determined in step S103, the adjusting method of temporarily drop generating means is determined
In low voltage crossing test, generally use impedance partial pressure type low-voltage dip generating means.According to low voltage crossing
Test request adjusts resistance R and reactance X values in current-limiting impedance Zsr and short-circuit impedance Zsc respectively, you can is generated in test point
Meet the voltage dip failure of temporary decline and phase hit angle in table 1；After determining Zsr and Zsc values, by adjusting short circuit
Switch should be able to accurately control the input of short-circuit reactance and mute time in all three-phases or quarter-phase circuit, most tight on DFIG influences
The waveform starting point of weight generates failure, can generate the voltage dip for meeting that voltage specification requires in table 1.
Using the requirement of low voltage crossing testing standard, low voltage crossing test is carried out.
It is required according to phenomenon testing standard, the test of temporarily drop feature and waveform starting point is considered in test point generates table 1
Voltage specification carries out no load test.The case where test point capacity of short circuit and no load test result meet low voltage crossing requirement
Lower carry out load testing, consistent when keeping current-limiting reactor and short-circuit impedance value with no load test when test, same fault type need
Test is twice.Specific testing procedure is identical with the existing test procedure of scheme, and details are not described herein again.
In the following, specifically by taking impedance angle representative value α=0 ° common in wind-electricity integration system and α=- 60 ° as an example, in application
Method is stated, determines the fault waveform starting point in low voltage crossing test and corresponding test voltage specification.
When wind turbine accesses impedance angle α=0 ° of power grid, according to the computational methods provided in scheme, by impedance angle value and electricity
Press temporary decline to substitute into formula (11) to formula (14), and further substitute into formula (10), can be obtained corresponding waveform starting point value and
Test voltage specification such as table 2.
Specification temporarily drops in 2 test voltage of table
When wind turbine accesses α=- 60 ° of the impedance angle of power grid, corresponding waveform starting point value and test electricity similarly can be obtained
Press specification such as table 3.
Specification temporarily drops in 3 test voltage of table
From above-described embodiment as can be seen that a kind of DFIG low voltage ride-through testing methods provided in this embodiment include：It obtains
The method of determination for taking the waveform starting point that under different faults type Wind turbines are influenced with most serious, obtains that rotor voltage is made to increase
The waveform starting point expression formula of width most serious；According to the waveform starting point expression formula and grid entry point voltage dip feature, determine
The calculation formula of most serious waveform starting point；Using the calculation formula, obtains and consider that spy temporarily drops in waveform starting point and grid entry point
Specification temporarily drops in the low voltage crossing test voltage of sign；Specification is temporarily dropped according to the low voltage crossing test voltage, DFIG is carried out
Low voltage crossing is tested.The application determines the waveform starting point expression formula of voltage amplification most serious first, and considers grid-connected
Point voltage dip feature, and then obtain low voltage crossing test voltage and temporarily drop specification, so as to more accurately assessment DFIG
Low voltage ride-through capability.
Corresponding with a kind of embodiment of DFIG low voltage ride-through testing methods that above-described embodiment provides, the application is implemented
Example additionally provides a kind of embodiment of DFIG low voltage crossings test device.As shown in figure 4, described device includes：First obtains
Module 201, determining module 202, the second acquisition module 203 and test module 204.
First acquisition module 201, for obtaining the wave that under different faults type Wind turbines are influenced with most serious
The method of determination of shape starting point obtains the waveform starting point expression formula for making rotor voltage amplification most serious.The determining module
202, for according to the waveform starting point expression formula and grid entry point voltage dip feature, determining the meter of most serious waveform starting point
Calculate formula.Second acquisition module 203 obtains for using the calculation formula and considers that waveform starting point and grid entry point are temporary
Specification temporarily drops in the low voltage crossing test voltage of drop feature.The test module 204, for being tested according to the low voltage crossing
Voltage dip specification carries out low voltage crossing test to DFIG.
First acquisition module 201 includes：First determination unit, the second determination unit and acquiring unit.Described first
Determination unit, for according to the fault type and the requirement of existing low voltage crossing standard for influencing most serious on DFIG, determining test
The fault type of Shi Caiyong；Second determination unit is used for according to waveform starting point to DFIG rotors open-circuit voltage after failure
Affecting laws, determine under different faults type on DFIG units influence most serious waveform starting point determination method；It is described
Acquiring unit, for being derived from the waveform starting point expression formula for influencing most serious on unit.
The determining module 202 includes：First computing unit, third determination unit and the 4th determination unit.Described first
Computing unit, for determining the temporary drop feature that calculates most serious waveform starting point and need to consider according to the waveform starting point expression formula
Amount；The third determination unit temporarily drops each variable correspondence and value in characteristic quantity for determining, the variable includes：Electricity
Net impedance angle, temporary decline, phase hit angle and trouble duration；4th determination unit, for special according to temporarily drop
Each variable correspondence and value determine the computational methods of most serious waveform starting point in sign amount.
Second acquisition module 203 includes：5th determination unit, the second computing unit and the 6th determination unit.It is described
5th determination unit, temporary decline when being tested for determining and trouble duration；Second computing unit, for using
The computational methods of waveform starting point, the temporary decline of determination and duration calculate corresponding phase hit angle and to DFIG
Unit influences the waveform starting point of most serious；6th determination unit considers that feature and waveform temporarily drop in grid entry point for determining
Specification temporarily drops in the test voltage of starting point.
The test module 204 includes：7th determination unit and test cell.7th determination unit, according to low electricity
It presses to wear and more tests determining voltage dip specification, determine the regulative mode of temporarily drop generating means；The test cell, for using
The requirement of low voltage crossing testing standard, carries out low voltage crossing test.
One kind provided in this embodiment is in the specific implementation, the application also provides a kind of computer storage media, wherein the meter
Calculation machine storage medium can have program stored therein, which may include when executing in each embodiment of method of calling provided by the present application
Part or all of step.The storage medium can be magnetic disc, CD, read-only memory (English：read-only
Memory, referred to as：ROM) or random access memory is (English：Random access memory, referred to as：RAM) etc..
It is required that those skilled in the art can be understood that the technology in the embodiment of the present application can add by software
The mode of general hardware platform realize.Based on this understanding, the technical solution in the embodiment of the present application substantially or
Say that the part that contributes to existing technology can be expressed in the form of software products, which can deposit
Storage is in storage medium, such as ROM/RAM, magnetic disc, CD, including some instructions are used so that computer equipment (can be with
Be personal computer, server either network equipment etc.) execute certain part institutes of each embodiment of the application or embodiment
The method stated.
The same or similar parts between the embodiments can be referred to each other in this specification.Implement especially for device
For example, since it is substantially similar to the method embodiment, so description is fairly simple, related place is referring in embodiment of the method
Explanation.
Above-described the application embodiment does not constitute the restriction to the application protection domain.
Claims (10)
1. a kind of DFIG low voltage ride-through testing methods, which is characterized in that the method includes：
The method of determination for obtaining the waveform starting point that under different faults type Wind turbines are influenced with most serious, obtains making rotor
The waveform starting point expression formula of voltage amplification most serious；
According to the waveform starting point expression formula and grid entry point voltage dip feature, determine that the calculating of most serious waveform starting point is public
Formula；
Using the calculation formula, obtain consider waveform starting point and grid entry point temporarily drop feature low voltage crossing test voltage it is temporary
Specification drops；
Specification is temporarily dropped according to the low voltage crossing test voltage, low voltage crossing test is carried out to DFIG.
2. DFIG low voltage ride-through testing methods according to claim 1, which is characterized in that the acquisition different faults class
The method of determination that under type Wind turbines are influenced with the waveform starting point of most serious, obtains the wave for making rotor voltage amplification most serious
Shape starting point expression formula, including：
According to the fault type and the requirement of existing low voltage crossing standard for influencing most serious on DFIG, the event used when test is determined
Hinder type；
According to waveform starting point to the affecting laws of DFIG rotors open-circuit voltage after failure, determine under different faults type to DFIG
Unit influences the determination method of the waveform starting point of most serious；
Being derived from influences unit the waveform starting point expression formula of most serious.
3. DFIG low voltage ride-through testing methods according to claim 1, which is characterized in that described to be risen according to the waveform
Initial point expression formula and grid entry point voltage dip feature, determine the calculation formula of most serious waveform starting point, including：
The temporary drop characteristic quantity that calculates most serious waveform starting point and need to consider is determined according to the waveform starting point expression formula；
Determine that each variable correspondence and value in temporarily drop characteristic quantity, the variable include：Electric network impedance angle, temporary decline, phase
Position saltus step angle and trouble duration；
The calculation formula of most serious waveform starting point is determined according to each variable correspondence and value in temporary drop characteristic quantity.
4. DFIG low voltage ride-through testing methods according to claim 1, which is characterized in that described public using the calculating
Specification temporarily drops in the low voltage crossing test voltage that feature temporarily drops in formula, acquisition consideration waveform starting point and grid entry point, including：
Determine the temporary decline and trouble duration when test；
Using the computational methods of waveform starting point, the temporary decline of determination and duration, corresponding phase hit angle is calculated
With the waveform starting point for influencing most serious on DFIG units；
It determines and considers that feature temporarily drops in grid entry point and specification temporarily drops in the test voltage of waveform starting point.
5. DFIG low voltage ride-through testing methods according to claim 1, which is characterized in that described according to low voltage crossing
Specification temporarily drops in test voltage, and low voltage crossing test is carried out to DFIG, including：
According to the determining voltage dip specification of low voltage crossing test, the regulative mode of temporarily drop generating means is determined；
Using the requirement of low voltage crossing testing standard, low voltage crossing test is carried out.
6. a kind of DFIG low voltage crossings test device, which is characterized in that described device includes：
First acquisition module influences the waveform starting point of most serious really under different faults type for obtaining on Wind turbines
Determine mode, obtains the waveform starting point expression formula for making rotor voltage amplification most serious；
Determining module, for according to the waveform starting point expression formula and grid entry point voltage dip feature, determining most serious waveform
The calculation formula of starting point；
Second acquisition module obtains for using the calculation formula and considers that the low of feature temporarily drops in waveform starting point and grid entry point
Specification temporarily drops in voltage ride-through test voltage；
Test module carries out low voltage crossing test for temporarily dropping specification according to the low voltage crossing test voltage to DFIG.
7. DFIG low voltage crossings test device according to claim 6, which is characterized in that the first acquisition module packet
It includes：
First determination unit, for being required according to the fault type and existing low voltage crossing standard that influence most serious on DFIG,
Determine the fault type used when test；
Second determination unit, for, to the affecting laws of DFIG rotors open-circuit voltage after failure, being determined not according to waveform starting point
With the determination method for the waveform starting point for influencing most serious under fault type on DFIG units；
Acquiring unit, for being derived from the waveform starting point expression formula for influencing most serious on unit.
8. DFIG low voltage crossings test device according to claim 6, which is characterized in that the determining module includes：
First computing unit calculates what most serious waveform starting point need to consider for being determined according to the waveform starting point expression formula
Temporarily drop characteristic quantity；
Third determination unit temporarily drops each variable correspondence and value in characteristic quantity for determining, the variable includes：Power grid hinders
Anti- angle, temporary decline, phase hit angle and trouble duration；
4th determination unit, for determining most serious waveform starting point according to each variable correspondence and value in temporarily drop characteristic quantity
Computational methods.
9. DFIG low voltage crossings test device according to claim 6, which is characterized in that the second acquisition module packet
It includes：
5th determination unit, temporary decline when being tested for determining and trouble duration；
Second computing unit calculates phase for computational methods, the temporary decline of determination and the duration using waveform starting point
The phase hit angle answered and the waveform starting point that most serious is influenced on DFIG units；
Specification temporarily drops in the 6th determination unit, the test voltage for temporarily dropping feature and waveform starting point for determining consideration grid entry point.
10. DFIG low voltage crossings test device according to claim 6, which is characterized in that the test module includes：
7th determination unit determines the adjusting of temporarily drop generating means according to the determining voltage dip specification of low voltage crossing test
Mode；
Test cell, for using the requirement of low voltage crossing testing standard, carrying out low voltage crossing test.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810024410.8A CN108344943B (en) | 2018-01-10 | 2018-01-10 | DFIG low voltage ride through test method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810024410.8A CN108344943B (en) | 2018-01-10 | 2018-01-10 | DFIG low voltage ride through test method and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108344943A true CN108344943A (en) | 2018-07-31 |
| CN108344943B CN108344943B (en) | 2020-10-13 |
Family
ID=62960426
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810024410.8A Active CN108344943B (en) | 2018-01-10 | 2018-01-10 | DFIG low voltage ride through test method and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108344943B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110456219A (en) * | 2019-08-12 | 2019-11-15 | 国网江西省电力有限公司电力科学研究院 | A kind of appraisal procedure of distribution line short voltage dip degree |
| CN112345853A (en) * | 2020-10-30 | 2021-02-09 | 广东电网有限责任公司广州供电局 | Method for evaluating improvement degree of voltage sag characteristic of transformer substation bus by fault current limiter |
| CN113555860A (en) * | 2021-07-28 | 2021-10-26 | 国网甘肃省电力公司 | Improved bridge type superconducting fault current limiter and resistance value adjusting method thereof |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102830318A (en) * | 2012-09-18 | 2012-12-19 | 黑龙江省电力科学研究院 | Wind power plant switch-in grid booster station grid-connected point low-voltage traversing ability on-line monitoring system |
| US20130138257A1 (en) * | 2011-11-30 | 2013-05-30 | Thomas Edenfeld | System for operating an electric power system and method of operating the same |
| CN103278773A (en) * | 2013-05-30 | 2013-09-04 | 湖南工业大学 | Multi-gear transformer type voltage drop device |
| CN103529335A (en) * | 2013-10-30 | 2014-01-22 | 国家电网公司 | Low voltage ride through detection device for grid connection photovoltaic inverter |
| KR101387686B1 (en) * | 2013-04-10 | 2014-05-07 | 한국전기연구원 | A low voltage generation equipments for lvrt test |
| CN104459540A (en) * | 2014-12-15 | 2015-03-25 | 云南电网有限责任公司电网规划研究中心 | Power-grid-impact-free detection method for low voltage ride through function of doubly-fed wind turbine generator system |
| CN104993520A (en) * | 2015-07-30 | 2015-10-21 | 国网浙江省电力公司电力科学研究院 | Frequency converter low-voltage ride-through (LVRT) supporting apparatus based on super capacitor |
| CN106291356A (en) * | 2016-07-27 | 2017-01-04 | 山东大学 | A kind of Wind turbines grid-connected low voltage crossing far-end detecting system and method |
| CN106532765A (en) * | 2016-10-20 | 2017-03-22 | 国网福建省电力有限公司 | Wind power generator set low voltage ride through capability testing method considering phase jump |
-
2018
- 2018-01-10 CN CN201810024410.8A patent/CN108344943B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130138257A1 (en) * | 2011-11-30 | 2013-05-30 | Thomas Edenfeld | System for operating an electric power system and method of operating the same |
| CN102830318A (en) * | 2012-09-18 | 2012-12-19 | 黑龙江省电力科学研究院 | Wind power plant switch-in grid booster station grid-connected point low-voltage traversing ability on-line monitoring system |
| KR101387686B1 (en) * | 2013-04-10 | 2014-05-07 | 한국전기연구원 | A low voltage generation equipments for lvrt test |
| CN103278773A (en) * | 2013-05-30 | 2013-09-04 | 湖南工业大学 | Multi-gear transformer type voltage drop device |
| CN103529335A (en) * | 2013-10-30 | 2014-01-22 | 国家电网公司 | Low voltage ride through detection device for grid connection photovoltaic inverter |
| CN104459540A (en) * | 2014-12-15 | 2015-03-25 | 云南电网有限责任公司电网规划研究中心 | Power-grid-impact-free detection method for low voltage ride through function of doubly-fed wind turbine generator system |
| CN104993520A (en) * | 2015-07-30 | 2015-10-21 | 国网浙江省电力公司电力科学研究院 | Frequency converter low-voltage ride-through (LVRT) supporting apparatus based on super capacitor |
| CN106291356A (en) * | 2016-07-27 | 2017-01-04 | 山东大学 | A kind of Wind turbines grid-connected low voltage crossing far-end detecting system and method |
| CN106532765A (en) * | 2016-10-20 | 2017-03-22 | 国网福建省电力有限公司 | Wind power generator set low voltage ride through capability testing method considering phase jump |
Non-Patent Citations (1)
| Title |
|---|
| 舒思婉: "双馈电机低电压穿越时的暂态特性研究", 《万方》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110456219A (en) * | 2019-08-12 | 2019-11-15 | 国网江西省电力有限公司电力科学研究院 | A kind of appraisal procedure of distribution line short voltage dip degree |
| CN112345853A (en) * | 2020-10-30 | 2021-02-09 | 广东电网有限责任公司广州供电局 | Method for evaluating improvement degree of voltage sag characteristic of transformer substation bus by fault current limiter |
| CN112345853B (en) * | 2020-10-30 | 2024-04-02 | 广东电网有限责任公司广州供电局 | Evaluation method for improvement degree of voltage sag characteristics of bus of transformer substation by fault current limiter |
| CN113555860A (en) * | 2021-07-28 | 2021-10-26 | 国网甘肃省电力公司 | Improved bridge type superconducting fault current limiter and resistance value adjusting method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108344943B (en) | 2020-10-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Chandrasekar et al. | Dynamic phasor modeling of type 3 DFIG wind generators (including SSCI phenomenon) for short-circuit calculations | |
| Holdsworth et al. | Electrical stability of large, offshore wind farms | |
| Gevorgian et al. | Wind power plant short circuit current contribution for different fault and wind turbine topologies | |
| Ierna et al. | Effects of VSM convertor control on penetration limits of non-synchronous generation in the GB power system | |
| CN106532765B (en) | Consider the low voltage ride through capacity of wind generating set test method of phase hit | |
| Gagnon et al. | Hydro-Québec strategy to evaluate electrical transients following wind power plant integration in the Gaspésie transmission system | |
| CN108344943A (en) | A kind of DFIG low voltage ride-through testing methods and device | |
| CN105281329B (en) | A kind of single-phase time sequence of coincidence setting method for improving 2 electro-mechanical force system transient modelling frequency stabilities | |
| Haddadi et al. | Power system test cases for EMT-type simulation studies | |
| Rao et al. | Synchrophasor assisted power swing detection scheme for wind integrated transmission network | |
| CN104865523A (en) | Doubly-fed generator simulation system and method | |
| Mahmud | Performance Comparison between Synchronous Condenser and Static VAR Compensator to Improve System Strength in a Wind Dominated Power Grid | |
| Raman et al. | An adaptive fuzzy mho relay for phase backup protection with infeed from STATCOM | |
| Cheng et al. | ERCOT PSCAD model review platform development and performance Comparison with PSS/e model | |
| Pourbeik et al. | Performing comprehensive voltage stability studies for the determination of optimal location, size and type of reactive compensation | |
| Hazra et al. | HVDC control strategies to improve transient stability in interconnected power systems | |
| Canelhas et al. | A low frequency power collector alternative system for long cable offshore wind generation | |
| Godoy Enciso et al. | Frequency response analysis under faults in weak power systems | |
| Elsamahy et al. | Impact of midpoint STATCOM on the coordination between generator distance phase backup protection and generator capability curves | |
| CN115378029A (en) | Virtual synchronous machine-based active new energy supporting method under fault | |
| Roy et al. | An effective VAR planning to improve dynamic voltage profile of distribution networks with distributed wind generation | |
| de Toledo et al. | TOPIC 7: Wind Farm In Weak Grids Compensated With Statcom | |
| Collins et al. | Voltage sags and the response of a synchronous distributed generator: A case study | |
| Chen et al. | Power quality knowledge application for low voltage ride through studies of wind turbine generator | |
| Orchi et al. | Voltage stability and power quality issues of wind farm with series compensation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |