CN107069800A - A kind of method for building up of double-fed fan motor short circuit current flow model - Google Patents
A kind of method for building up of double-fed fan motor short circuit current flow model Download PDFInfo
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- H02J3/386—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
Abstract
The invention discloses a kind of method for building up of double-fed fan motor short circuit current flow model, the short circuit current flow decoupling for first providing double-fed fan motor place under electric network fault is passive network and each typhoon motor group；Equivalent processing is carried out to both respectively, is frequency dependent model by passive network equivalence, is low frequency dynamic model by each typhoon motor group equivalence；The frequency dependent model and low frequency dynamic model are analyzed to the influence that double-fed fan motor short circuit current flow variation characteristic is brought in the failure full time cycle, the major influence factors of double-fed fan motor steady-state shortcircuit current are obtained；Based on the major influence factors, the steady-state shortcircuit current computation model of double-fed fan motor is derived and set up.The above method can overcome the defect that current wind power plant calculation of short-circuit current model is present, and meet the demand of wind power plant relay protection setting calculation.
Description
Technical field
The present invention relates to wind power plant technical field of relay protection, more particularly to a kind of double-fed fan motor short circuit current flow model
Method for building up.
Background technology
In recent years wind-powered electricity generation is very swift and violent in China's development, and its permeability just increases year by year.Yet with it is wind farm grid-connected need to be according to
Rely in power electronic equipment, occur to sexually revise at all which results in got access to grid fault characteristic, existing electric grid relay protection front
Face serious challenge, relevant issues have caused electric power enterprise and related scientific research institutes extensive concern.Substantially, wind power plant access electricity
Why essence change occurs for net fault characteristic：One be wind power plant generating mechanism different from conventional synchronization generate electricity
The control strategy of machine, its fault characteristic and current transformer is closely related；Two be current transformer use control strategy it is various and control ginseng
Number is uncertain, along with the mathematical models exponent number of wind power plant is very high, causes the voltage using conventional synchronization generator as representative
Source E series connection X∑Short circuit calculation model can not characterize the fault characteristic of wind power plant, the relay protection setting that wind-powered electricity generation place gets access to grid
Calculate and lack theory support.
The short circuit current flow of wind power plant is to include the elements such as Wind turbines, case change, collection electric line in field to be total under false voltage
With the result of response, and double-fed fan motor unit is connected by stator winding and net side current transformer with power network, its short circuit current flow and wind
The control strategy of power generator electric parameter and current transformer, control parameter are relevant.It is complicated in double-fed fan motor in addition to Wind turbines
Passive network (collection electric line, case changes, wave filter etc. are constituted) transient current can be also produced under the excitation of false voltage, entirely
The electromagnetic transient of wind power plant is sufficiently complex, widely different with synchronous electromechanical source, how accurately to analyze the electricity of double-fed fan motor
Magnetic transient process, is the key foundation problem for setting up rational wind power plant calculation of short-circuit current model.
Wind turbines in wind power plant are numerous and the topological complexity of passive network, analyze each wind turbine one by one using prior art
Short circuit current flow electromagnetic transient in group, passive network elements will be very cumbersome, and for send out line fault for, also without
Need individually to carry out analysis calculating to the electric current of each typhoon motor.
The content of the invention
It is an object of the invention to provide a kind of method for building up of double-fed fan motor calculation of short-circuit current model, this method can
The defect for overcoming current wind power plant calculation of short-circuit current model to exist, meets the demand of wind power plant relay protection setting calculation.
A kind of method for building up of double-fed fan motor short circuit current flow model, methods described includes：
The short circuit current flow decoupling that double-fed fan motor place under electric network fault is provided is passive network and each typhoon motor group；
Equivalent processing is carried out to both respectively, is frequency dependent model by passive network equivalence, by each typhoon
Motor group equivalence is low frequency dynamic model；
The frequency dependent model and low frequency dynamic model are analyzed to double-fed fan motor short circuit electricity in the failure full time cycle
The influence that stream variation characteristic is brought, obtains the major influence factors of double-fed fan motor steady-state shortcircuit current；
Based on the major influence factors, the steady-state shortcircuit current computation model of double-fed fan motor is derived and set up.
It is described to be specially for the process of frequency dependent model by passive network equivalence：
Double-fed fan motor machine, net side current transformer are broken from the passive network, will be switched off locating both sides grid grounding, realize
To fan power zero setting；
Then a series of different frequency voltage sources, remaining two phase ground, in the boundary node are added in boundary node A
Three-phase voltage and electric current under the upper different frequency of measurement respectively；
Extracted and voltage source frequency identical voltage, power frequency component, and calculated from the side using Fourier transformation
The discrete admittance matrix of boundary's node；
Continuous rational function is fitted to vector fitting method, the expression formula of final gained frequency dependent model is：
Wherein, n is the limit number of fitting；cnWith anRespectively residual and limit, with real number or paired conjugate complex number form
Occur；D, h are optional parameters, are real number.
The main circuit part of the low frequency dynamic model is double-fed generator and net side current transformer, and control system part is by surveying
Measure link, net side/pusher side current transformer Power Control link, net side/pusher side current transformer current control link composition；
Wherein, the measurement links are used to measure the instantaneous of double-fed fan motor unit rotor and the voltage and current of grid entry point
Value, and measure the voltage phase angle of grid entry point with use PHASE-LOCKED LOOP PLL TECHNIQUE；
The net side/pusher side current transformer power control loop root section is according to reality of the value and power reference to net side/pusher side current transformer
Power is controlled, the reference value of output current controlling unit；
The net side/output of the pusher side current transformer current regulator root section according to current reference value to net side/pusher side current transformer
Electric current is controlled.
The derivation of the steady-state shortcircuit current computation model of the double-fed fan motor is：
The stator current and net side current transformer electric current of every double-fed fan motor machine are calculated respectively, obtain separate unit wind turbine electric current；
Then all wind turbine electric currents are added, obtain whole double-fed fan motor short circuit current flow model, be embodied as：
Wherein, subscript+,-expression positive sequence, negative phase-sequence synchronous rotating frame；N is double-fed fan motor board number；isd,j、isq,jFor
D, q axle stator current value of jth platform double-fed fan motor machine in；igd,j、igq,jFor d, q axle net side of jth platform double-fed fan motor machine in field
Current transformer current value；Tdq-abcFor the transformation matrix of dq synchronous rotating frames to abc rest frames；iΣ abcFor double-fed fan motor
Field total current.
As seen from the above technical solution provided by the invention, the above method can overcome current wind power plant short circuit current flow
The defect that computation model is present, meets the demand of wind power plant relay protection setting calculation.
Brief description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, being used required in being described below to embodiment
Accompanying drawing be briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for this
For the those of ordinary skill in field, on the premise of not paying creative work, other can also be obtained according to these accompanying drawings
Accompanying drawing.
Fig. 1 is provided the method for building up schematic flow sheet of double-fed fan motor short circuit current flow model by the embodiment of the present invention；
Fig. 2 sets up schematic diagram by what the embodiment of the present invention provided frequency dependent model；
The structural representation for the low frequency dynamic current model that Fig. 3 is provided by the embodiment of the present invention；
Fig. 4 embodiment of the present invention provides positive sequence q shaft current inner ring structural representations；
Fig. 5 provides net side current transformer current inner loop step response curve schematic diagram by the embodiment of the present invention；
Fig. 6 is the topological structure schematic diagram of example actual electric network of the present invention；
Fig. 7 is example double-fed fan motor of the present invention Equivalent Model checking curve comparison schematic diagram.
Embodiment
With reference to the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Ground is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.Based on this
The embodiment of invention, the every other implementation that those of ordinary skill in the art are obtained under the premise of creative work is not made
Example, belongs to protection scope of the present invention.
The embodiment of the present invention is described in further detail below in conjunction with accompanying drawing, is as shown in Figure 1 present invention implementation
Example provides the method for building up schematic flow sheet of double-fed fan motor short circuit current flow model, and methods described includes：
Step 1, the short circuit current flow decoupling for providing double-fed fan motor place under electric network fault are passive network and each typhoon electricity
Machine group；
Step 2：Equivalent processing is carried out to both respectively, is frequency dependent model by passive network equivalence, will be described
Each typhoon motor group equivalence is low frequency dynamic model；
In this step, frequency dependent model is that have identical frequency spy with detailed network before abbreviation in wide frequency range
Property admittance matrix, it is many passive including becoming etc. comprising main transformer, collection electric line, wave filter, case in field in wind turbine group
Device, mainly reflects the variation characteristic of its high-frequency electrical tolerance during transient state, is illustrated in figure 2 the embodiment of the present invention and provides frequency
Rate relies on the schematic diagram of setting up of model, above-mentioned to be specially for the process of frequency dependent model by passive network equivalence：
Double-fed fan motor machine, net side current transformer are broken from the passive network first, will be switched off locating both sides grid grounding,
Realize to fan power zero setting；
Then a series of different frequency voltage sources are added in boundary node (main transformer low-pressure side) A, remaining two phase ground,
The three-phase voltage and electric current under different frequency are measured on boundary node respectively；
Extracted and voltage source frequency identical voltage, power frequency component, and calculated from the side using Fourier transformation
The discrete admittance matrix of boundary's node；
Continuous rational function is fitted to vector fitting method, the expression formula of final gained frequency dependent model is：
Wherein, n is the limit number of fitting；cnWith anRespectively residual and limit, with real number or paired conjugate complex number form
Occur；D, h are optional parameters, are real number.Resonance peak number on frequency domain characteristic can determine that n lower limit, then be intended by vector
Conjunction can determine an、cn, h, d parameter.
In the specific implementation, the three-phase frequency for being fitted gained self-admittance, transadmittance rational function is constituted is relied on into admittance matrix
Positive sequence, negative sequence component are decomposed into, the attenuation characteristic of passive network electric current is analyzed according to the limit of sequence admittance.Table 1 below is typical case
The limit of double-fed fan motor passive network sequence admittance, therefrom visible, high fdrequency component (529Hz) is finished through cycle or so decay,
DC component decay is very fast.
The typical double-fed fan motor passive network sequence admittance limit of table 1 and frequency dependent model current attenuation situation
After transient process terminates, passive network electric current enters steady-state process.Now, it is mainly power frequency point in false voltage
Amount, under power-frequency voltage excitation, flows through power current on passive network.From the frequency characteristic of admittance, obtain positive and negative at 50Hz
The phasor of sequence admittance is Y1=Y2=6.18E-06+7.34E-04I Si, the order of magnitude is very small.Therefore, during failure, passive network
On flow only through smaller power frequency steady-state current, will be substantially less that the short circuit current flow that wind turbine is provided.
As can be seen here, the feature of the frequency dependent model is：The transient short circuit current of offer is comparatively fast decayed, steady-state short-circuit electricity
Stream provides short circuit current flow much smaller than Wind turbines.
Further, the main circuit part of the low frequency dynamic model is double-fed generator and net side current transformer, control system
System part is made up of measurement links, net side/pusher side current transformer Power Control link, net side/pusher side current transformer current control link,
It is illustrated in figure 3 the structural representation for the low frequency dynamic current model that the embodiment of the present invention is provided：
Wherein, the measurement links are used to measure the instantaneous of double-fed fan motor unit rotor and the voltage and current of grid entry point
Value, and measure the voltage phase angle of grid entry point with use PHASE-LOCKED LOOP PLL TECHNIQUE；
The net side/pusher side current transformer power control loop root section is according to reality of the value and power reference to net side/pusher side current transformer
Power is controlled, the reference value of output current controlling unit；
The net side/output of the pusher side current transformer current regulator root section according to current reference value to net side/pusher side current transformer
Electric current is controlled.Above-mentioned net side current transformer and the output current of stator winding are determined by current control link and limited by limiter
System.
The derivation of above-mentioned low frequency dynamic model is illustrated with specific example below：
During failure, stator winding and net side current transformer all output short circuit currents of double-fed fan motor machine, herein for adopting
Net side, the pusher side current transformer of " control forward-order current, eliminate negative-sequence current " are taken, the short circuit of stator winding and net side current transformer is derived
Electric current.
1) generator unit stator short circuit in winding curent change specificity analysis
The space vector equation of the stator and rotor voltage equation of double-fed fan motor machine and magnetic linkage under dq coordinate systems：
ψsdq=Lsisdq+Lmirdq (4)
ψrdq=Lmisdq+Lrirdq (5)
In formula, usdq、urdqFor stator and rotor voltage；ψsdq、ψrdqFor stator and rotor magnetic linkage；isdq、irdqFor stator and rotor electric current；
Rr、RsFor stator and rotor resistance parameters；Ls、Lr、LmRespectively stator and rotor self-induction and mutual inductance.
During failure, double-fed fan motor machine using stator magnetic linkage compensation and current feed-forward decoupling technology, eliminate magnetic linkage mutation and
The interference that current coupling is brought, reaches best control effect, and then formula (3) is transformed to：
Laplace transformation is implemented to formula (2), formula (6), stator and rotor magnetic linkage is represented with stator and rotor electric current, rectangular is written as
Formula：
The characteristic equation of formula (7) is：
The characteristic root of formula (8) is：
Wherein：
The characteristic root of formula (7) determines the attenuation characteristic of double-fed fan motor machine stator electric current free component.
Substitute into after design parameter, each free component die-away time, frequency are as shown in table 2 below.From table 2, control system
Under being mutually coupled of parameter and wind turbine parameter, the frequency component close to power frequency and the frequency close to direct current are included in short circuit current flow
Rate component.
The double-fed fan motor machine stator short circuit current flow characteristic root of table 2
During failure stable state, the decay of stator magnetic linkage free component is finished, and rotor current is stable in reference value, i.e. formula (2)
Magnetic linkage differential term is 0, and irdq=i* rdq.Therefore, stator current can be solved by formula (2), formula (4)：
2) net side current transformer short circuit current flow variation characteristic is analyzed
Due to using suppress negative-sequence current control strategy, no matter normally operation or failure during, negative-sequence current refer to
Value is 0 always.During failure, only the reference value of forward-order current inner ring changes in double PI current inner loops, therefore by studying positive sequence
The time domain specification of current inner loop investigates its influence to short circuit current flow transient process.
The embodiment of the present invention as shown in Figure 4 is provided in positive sequence q shaft current inner ring structural representations, Fig. 4：Kip+Kii/ s is
The transmission function of current inner loop PI controls, Kip、KiiRespectively proportional component and integral element coefficient；KPWM/(TPWM/ s+1) it is to become
Flow the transmission function of device, KPWMFor current transformer gain, TPWMFor inertia time constant；1/ (Ls+R) is the transmission of generator terminal filter circuit
Function, L, R are respectively the inductance and resistance that generator terminal is connected with outer net.
According to net side current transformer current inner loop control structure, open-loop transfer function is write out：
Substitute into specific control parameter (perunit)：Kip=0.8196, Kii=0.6006, KPWM=3.17, TPWM=0.1496, L
=0.3964, R=0.009469, is illustrated in figure 5 the embodiment of the present invention and provides net side current transformer current inner loop step response
Curve synoptic diagram, as seen from Figure 5：The unit-step response regulating time of current inner loop is 17ms or so.This shows to join after failure
In the case of examining the mutation of value step, forward-order current inner ring can be in a cycle by forward-order current control to reference value, Zhi Hou electricity
Stream enters stable state.
During failure stable state, ignore current transformer loss, then the active power of slave side converter input (or output) is equal to
The active power of (or input) is exported from net side current transformer, considers further that two current transformers are oriented with d shaft voltages, can obtain current transformer has
Work(equilibrium equation：
Wherein, PGSCAnd PRSCRespectively net side, pusher side current transformer power output；ugdqAnd igdqRespectively net side current transformer is handed over
Flow side dq shaft voltages and electric current；ugdAnd igdRespectively net side current transformer AC d shaft voltages, electric current；urdqAnd irdqRespectively machine
Side converter AC dq shaft voltages and electric current；urdAnd irdRespectively pusher side AC side of converter d shaft voltages, electric current；Re(*)
To take real part computing,To take conjugate operation.
When net side current transformer is controlled using constant power factor, there is igq=0.Net side current transformer output current is：
In formula (13), ugdApproximately it is taken as set end voltage usd。urdIt can then be asked for according to formula (3).During considering stable state, formula
(3) differential term is 0 in, and formula (5) is substituted into formula (3).
urdq=Lsisdq+(jωsLm+Rr)irdq (14)
In formula (14), irdqRotor current reference value i can be used* rdqInstead of；isdqThat is forward-order current steady-state component, above
In provide computational methods.Therefore, net side current transformer positive sequence steady-state shortcircuit current is：
Step 3：The frequency dependent model and low frequency dynamic model are analyzed to double-fed fan motor in the failure full time cycle
The influence that short circuit current flow variation characteristic is brought, obtains the major influence factors of double-fed fan motor steady-state shortcircuit current；
In this step, with reference to the analysis in step 2 to frequency dependent model and low frequency dynamic model, double-fed can be obtained
The time scale of wind power plant short circuit current flow electromagnetic transient：If considering nearly DC component, when whole fault transient process continues
Between be up to 130~140ms；The short circuit current flow transient state time of net side current transformer is most short (15~25ms), next to that high fdrequency component (20
~30ms), nearly power frequency component is finished in decay after 30~40ms, and nearly DC component decay is relatively slow (130~140ms).Wind turbine
In short circuit current flow, DC component die-away time length is to be set because of current inner loop just for the quick control of (near) power frequency amount,
DC component can not fast and effeciently be controlled.After failure, the transient current of double-fed fan motor is not only relevant with magnetic linkage initial value, also by
Control parameter determines that transient current variation characteristic is complicated and changeable, it is impossible to obtain analytical expression, therefore the embodiment of the present invention is mainly divided
The calculation of short-circuit current model of double-fed fan motor during analysis failure stable state, i.e., obtain double-fed fan motor stable state with formula 10,15
The major influence factors of short circuit current flow.
Step 4：Based on the major influence factors, the steady-state shortcircuit current for deriving and setting up double-fed fan motor calculates mould
Type.
In this step, the derivation of the steady-state shortcircuit current computation model of the double-fed fan motor is：
The stator current and net side current transformer electric current of every double-fed fan motor machine are calculated respectively, obtain separate unit wind turbine electric current；
Then all wind turbine electric currents are added, obtain whole double-fed fan motor short circuit current flow model.
Specifically, first under synchronous rotating frame, each double-fed fan motor machine stator in field is calculated according to formula (10)
The short circuit current flow dq axis components that winding is exported to power network；
Then under synchronous rotating frame, each double-fed fan motor machine net side current transformer in field is calculated according to formula (15) and provided
Short circuit current flow dq axis components；
Said stator short circuit in winding electric current and net side current transformer short circuit current flow are changed from dq axles synchronous rotating frame again
It is added after on to three-phase static coordinate system；
Calculated according to above-mentioned steps in field after the short circuit current flow of every double-fed fan motor machine, by the short circuit current flow of all wind turbines
It is added, so as to obtain whole double-fed fan motor short circuit current flow model, the model is embodied as：
Wherein, subscript+,-expression positive sequence, negative phase-sequence synchronous rotating frame；N is double-fed fan motor board number；isd,j、isq,jFor
D, q axle stator current value of jth platform double-fed fan motor machine in；igd,j、igq,jFor d, q axle net side of jth platform double-fed fan motor machine in field
Current transformer current value；Tdq-abcFor the transformation matrix of dq synchronous rotating frames to abc rest frames；iΣ abcFor double-fed fan motor
Field total current.
In above-mentioned formula (16), isd,j、isq,j、igd,j、igq,jCan be tried to achieve by formula (10), formula (15), and with control parameter without
Close.In practical application calculation of short-circuit current model, DC component is filtered out with Fourier algorithm, (near) power frequency component is only extracted.
It is therefore contemplated that 30~40ms is interior with regard to reaching steady-state process after a failure for double-fed fan motor short circuit current flow, foregoing institute is now used
Put forward calculation formula and do not result in too big error.
The effect of above-mentioned model is verified in conjunction with specific example below：
The topological structure schematic diagram of example actual electric network of the present invention is illustrated in figure 6, as shown in Figure 6：Somewhere electricity
In net, comprising coming good fortune wind power plant and big mound wind power plant.Wherein, containing 160 1.5MW double-fed fan motor machines in big mound wind power plant
Group, is divided into 8 and collects circuit access power network, every is collected line length 10km, and 20 typhoon motors are connected to thereon.On the big line of good fortune
Become away from big peace and B phase transient earthing failures occur at 0.28km, trouble duration about 60ms, failure Qian Caizi townshiies wind power plant is sent
Active power 105.91MW, reactive power -17.33Mvar.
Equivalence is carried out to big mound wind power plant with methods described of the embodiment of the present invention, and failure is set, wind power plant master is measured
Become high voltage side current, contrasted with fault recorder data, be illustrated in figure 7 the equivalent mould of example double-fed fan motor of the present invention
Type verifies curve comparison schematic diagram, as seen from the figure：Equivalent Model and fault recorder data coincide, it was demonstrated that equivalence method it is accurate
Property.
Next, double-fed fan motor short circuit current flow model is verified, and it is same using wind-electricity integration system shown in Fig. 6, event is set
Wind speed is rated wind speed before barrier, main transformer high-pressure side (send out line head end) set respectively three-phase ground failure, C phases earth fault,
AC phases earth fault, AC phase-to phase faults.Grounding resistance 5 Ω, the alternate Ω of resistance 1.Extract steady in emulation data with Fourier algorithm
The positive-sequence component of state short circuit current flow, short circuit current flow is calculated with formula (16), and emulation, calculated value the results are shown in Table shown in 3~table 6：
It is low during 3 balanced to ground failure of table to wear double-fed fan motor short circuit current flow under strategy
It is low during 4 C phase earth faults of table to wear double-fed fan motor short circuit current flow under strategy
It is low during 5 AC phase earth faults of table to wear double-fed fan motor short circuit current flow under strategy
It is low during 6 AC phase-to phase faults of table to wear double-fed fan motor short circuit current flow under strategy
From above tables as can be seen that when considering the short circuit current flow of net side current transformer (GSC) offer, short circuit current flow
Amplitude error between calculated value and simulation value is both less than 5%, phase angle also substantially close to；Do not consider that net side current transformer is provided short
During the electric current of road, current amplitude error is up to 10~20%, and its phase angle error is also very big.This absolutely proves that meter and net side current transformer are provided
The importance of short circuit current flow.
Above-mentioned example is fully proved, during the method for building up described in the embodiment of the present invention can be effectively applicable to failure stable state
Electric current calculating, solve currently with to large-scale wind power short circuit current flow Current calculation model is unreasonable, amount of calculation is multiple
The problems such as miscellaneous, computationally intensive, required parameter is more, and the precision of double-fed fan motor calculation of short-circuit current is ensure that, this is containing big rule
The adaptive setting of mould wind farm relay protection has established theoretical foundation.
In addition, being to lead to one of ordinary skill in the art will appreciate that realize in examples detailed above all or part of flow
Cross computer program to complete, described program can be stored in computer read/write memory medium, corresponding programme upon execution,
It may include the flow of above-mentioned each method.Wherein, described storage medium can be CD, USB flash disk, mobile hard disk etc..
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art is in the technical scope of present disclosure, the change or replacement that can be readily occurred in,
It should all be included within the scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of claims
Enclose and be defined.
Claims (4)
1. a kind of method for building up of double-fed fan motor short circuit current flow model, it is characterised in that methods described includes：
The short circuit current flow decoupling that double-fed fan motor place under electric network fault is provided is passive network and each typhoon motor group；
Equivalent processing is carried out to both respectively, is frequency dependent model by passive network equivalence, by each typhoon motor
Group equivalence is low frequency dynamic model；
The frequency dependent model and low frequency dynamic model is analyzed to become double-fed fan motor short circuit current flow in the failure full time cycle
Change the influence that characteristic is brought, obtain the major influence factors of double-fed fan motor steady-state shortcircuit current；
Based on the major influence factors, the steady-state shortcircuit current computation model of double-fed fan motor is derived and set up.
2. the method for building up of double-fed fan motor short circuit current flow model according to claim 1, it is characterised in that it is described will be described
Passive network equivalence is that the process of frequency dependent model is specially：
Double-fed fan motor machine, net side current transformer are broken from the passive network, will be switched off locating both sides grid grounding, realize to wind
Electromechanical source zero setting；
Then a series of different frequency voltage sources are added in boundary node A, remaining two phase ground divides on the boundary node
Three-phase voltage and electric current that Ce Liang be under different frequency；
Extracted and voltage source frequency identical voltage, power frequency component, and calculated from border section using Fourier transformation
The discrete admittance matrix of point；
Continuous rational function is fitted to vector fitting method, the expression formula of final gained frequency dependent model is：
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Wherein, n is the limit number of fitting；cnWith anRespectively residual and limit, are gone out with real number or paired conjugate complex number form
It is existing；D, h are optional parameters, are real number.
3. the method for building up of double-fed fan motor short circuit current flow model according to claim 1, it is characterised in that the low frequency is moved
The main circuit part of states model is double-fed generator and net side current transformer, and control system part is become by measurement links, net side/pusher side
Flow device Power Control link, net side/pusher side current transformer current control link composition；
Wherein, the measurement links are used for the instantaneous value for measuring double-fed fan motor unit rotor and the voltage and current of grid entry point, and
With the voltage phase angle that grid entry point is measured using PHASE-LOCKED LOOP PLL TECHNIQUE；
The net side/pusher side current transformer power control loop root section is according to actual power of the value and power reference to net side/pusher side current transformer
It is controlled, the reference value of output current controlling unit；
The net side/pusher side current transformer current regulator root section is according to output current of the current reference value to net side/pusher side current transformer
It is controlled.
4. the method for building up of double-fed fan motor short circuit current flow model according to claim 1, it is characterised in that the double-fed wind
The derivation of the steady-state shortcircuit current computation model of electric field is：
The stator current and net side current transformer electric current of every double-fed fan motor machine are calculated respectively, obtain separate unit wind turbine electric current；
Then all wind turbine electric currents are added, obtain whole double-fed fan motor short circuit current flow model, be embodied as：
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Wherein, subscript+,-expression positive sequence, negative phase-sequence synchronous rotating frame；N is double-fed fan motor board number；isd,j、isq,jFor in field
D, q axle stator current value of jth platform double-fed fan motor machine；igd,j、igq,jFor d, q axle net side unsteady flow of jth platform double-fed fan motor machine in field
Device current value；Tdq-abcFor the transformation matrix of dq synchronous rotating frames to abc rest frames；iΣ abcIt is total for double-fed fan motor
Electric current.
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| CN108566132A (en) * | 2018-04-18 | 2018-09-21 | 昆明理工大学 | A kind of analytic method of double fed induction generators three short circuit current after crow bar protection act |
| CN109038661A (en) * | 2018-08-01 | 2018-12-18 | 国电南瑞科技股份有限公司 | A kind of double-fed fan motor unit control method and system having active frequency modulation function |
| CN109888820A (en) * | 2019-02-14 | 2019-06-14 | 国网甘肃省电力公司嘉峪关供电公司 | Method for calculating the short circuit current contribution value of new energy unit |
| CN112198452A (en) * | 2020-09-21 | 2021-01-08 | 华北电力大学 | Construction method of new energy short-circuit current expression suitable for engineering practicality |
| CN112800605A (en) * | 2021-01-26 | 2021-05-14 | 国网江苏省电力有限公司电力科学研究院 | Vector wind power plant modeling method |
| CN113405787A (en) * | 2021-05-28 | 2021-09-17 | 上海电机学院 | Mechanical admittance testing method and device for motor stator system |
| CN113690903A (en) * | 2021-08-18 | 2021-11-23 | 广东电网有限责任公司 | Reduced order decoupling analysis method, system, equipment and medium for double-fed wind turbine generator |
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| CN108566132A (en) * | 2018-04-18 | 2018-09-21 | 昆明理工大学 | A kind of analytic method of double fed induction generators three short circuit current after crow bar protection act |
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| CN109038661A (en) * | 2018-08-01 | 2018-12-18 | 国电南瑞科技股份有限公司 | A kind of double-fed fan motor unit control method and system having active frequency modulation function |
| CN109888820A (en) * | 2019-02-14 | 2019-06-14 | 国网甘肃省电力公司嘉峪关供电公司 | Method for calculating the short circuit current contribution value of new energy unit |
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| CN112198452A (en) * | 2020-09-21 | 2021-01-08 | 华北电力大学 | Construction method of new energy short-circuit current expression suitable for engineering practicality |
| CN112198452B (en) * | 2020-09-21 | 2023-09-05 | 华北电力大学 | Construction method of new energy short-circuit current expression suitable for engineering practicability |
| CN112800605A (en) * | 2021-01-26 | 2021-05-14 | 国网江苏省电力有限公司电力科学研究院 | Vector wind power plant modeling method |
| CN113405787A (en) * | 2021-05-28 | 2021-09-17 | 上海电机学院 | Mechanical admittance testing method and device for motor stator system |
| CN113405787B (en) * | 2021-05-28 | 2023-11-10 | 上海电机学院 | Motor stator system mechanical admittance testing method and device |
| CN113690903A (en) * | 2021-08-18 | 2021-11-23 | 广东电网有限责任公司 | Reduced order decoupling analysis method, system, equipment and medium for double-fed wind turbine generator |
| CN113690903B (en) * | 2021-08-18 | 2023-06-13 | 广东电网有限责任公司 | Reduced-order decoupling analysis method, system, equipment and medium for doubly-fed wind turbine generator |
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Application publication date: 20170818 |