CN107658913A - A kind of control method and device of double-fed generator unbalance grid failure - Google Patents
A kind of control method and device of double-fed generator unbalance grid failure Download PDFInfo
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- CN107658913A CN107658913A CN201711013248.1A CN201711013248A CN107658913A CN 107658913 A CN107658913 A CN 107658913A CN 201711013248 A CN201711013248 A CN 201711013248A CN 107658913 A CN107658913 A CN 107658913A
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/50—Controlling the sharing of the out-of-phase component
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Abstract
The embodiment of the present invention provides a kind of control method and device of double-fed generator unbalance grid failure, this method obtains the parameter of electric machine and grid line voltage of the double-fed generator first, and the positive sequence voltage component and negative sequence voltage components of power network are determined based on the grid line voltage, the positive sequence voltage component of the parameter of electric machine and the power network is then based on, determines the correction value of rotor current specified rate corresponding to unbalance grid failure.When judging to occur unbalance grid failure, rotor watt current specified rate, rotor reactive current specified rate and the correction value of the power ring output based on current transformer, determine that the target current ring of rotor gives electric current.It can be seen that the embodiment of the present invention provides a kind of control method and device of double-fed generator unbalance grid failure, the regulation to the negative sequence component of line voltage can be realized.
Description
Technical field
The present invention relates to technical field of new energy power generation, and in particular to a kind of control of double-fed generator unbalance grid failure
Method and device processed.
Background technology
At present, in wind-powered electricity generation electricity generation system, when there is unbalance grid failure in double-fed generator, the negative phase-sequence of line voltage
The presence of component can produce negative-sequence current in the stator and rotor electric current of generator, and then influence the riding quality of generator, even
Jeopardize the safe for operation of unit.
Traditional regulative mode be by under positive sequence, negative phase-sequence synchronous coordinate system, to the positive sequence of generator rotor current with
Negative-sequence current is individually controlled.Also, positive sequence is converted to straight under positive sequence and negative phase-sequence coordinate system respectively with negative sequence component
Flow, the zero steady state error control of rotor is realized so as to adoption rate integral controller.
I.e. under line voltage asymmetrical, to realize the control to rotor current, it is desirable to which rotor-side converter is necessary
Certain positive sequence and negative sequence voltage can be produced.But when power network degree of asymmetry is larger, DC voltage can not meet to produce
The control requirement of raw negative sequence voltage, can cause because adjuster is out of hand, cause unit to deteriorate electricity from power network absorbing reactive power
Net.Now, unit absorbs active power from power network, causes the lifting of motor speed, or even cause the failure off-grid of unit.
Therefore, how a kind of control method and device of double-fed generator unbalance grid failure are provided, can be realized pair
The regulation of the negative sequence component of line voltage, it is those skilled in the art's big technical barrier urgently to be resolved hurrily.
The content of the invention
In view of this, the embodiment of the present invention provides a kind of control method and dress of double-fed generator unbalance grid failure
Put, the regulation to the negative sequence component of line voltage can be realized.
To achieve the above object, the embodiment of the present invention provides following technical scheme：
A kind of control method of double-fed generator unbalance grid failure, including：
The parameter of electric machine of the double-fed generator is obtained, the parameter of electric machine includes stator self inductance Ls, rotor self-induction LrAnd
Rotor mutual inductance Lm；
Grid line voltage is obtained, the grid line voltage includes the first line voltage UabAnd the second line voltage Ubc；
Based on the grid line voltage, the positive sequence voltage component Up and negative sequence voltage components Un of power network, institute is calculated
Stating positive sequence voltage component includes d axle positive sequence voltage components usd*pAnd q axle positive sequence voltage components usq*p, the negative sequence voltage components
Including d axle negative sequence voltage components usd*nAnd q axle negative sequence voltage components usq*n；
The positive sequence voltage component of the parameter of electric machine and the power network based on the double-fed generator, determine asymmetric electricity
The correction value of rotor current specified rate corresponding to net failure, the correction value include d shaft current correction values Id *And q shaft currents are repaiied
On the occasion of Iq *；
Based on the negative sequence voltage components and default asymmetrical voltage fault reference value Uset, judge whether to occur not
Symmetrical electric network fault, if it is, the power ring based on current transformer export rotor watt current specified rate, rotor reactive current to
The correction value of rotor current specified rate corresponding to quantitative and described unbalance grid failure, determine the target current ring of rotor
Given electric current, the target current ring, which gives electric current, includes the given electric current of d axles target and the given electric current of q axles target.
Optionally, the positive sequence voltage component and negative sequence voltage for being based on the grid line voltage, power network being calculated
Component, including：
Obtain line voltage positive sequence angle, θs p, and according to the line voltage positive sequence angle, θs pLine voltage is calculated
Negative phase-sequence angle, θs n；
Based on the grid line voltage and the line voltage negative phase-sequence angle, θs n, determine the positive sequence voltage of the power network
Component, the positive sequence voltage component include d axle positive sequence voltage components ud *With q axle positive sequence voltage components uq *。
Optionally, it is described to be based on the grid line voltage and the line voltage negative phase-sequence angle, θs n, determine the electricity
The positive sequence voltage component of net, including：
By the grid line voltage according to the line voltage negative phase-sequence angle, θs nCoordinate Conversion is carried out, obtains line voltage d
Axis component udAnd line voltage q axis components uq；
By the line voltage d axis components udAnd line voltage q axis components uqProcessing is filtered, obtains d axles direct current point
Measure ud_tempAnd q axle DC components uq_temp；
Determine the line voltage d axis components udAnd line voltage q axis components uqWith the d axles DC component ud_tempWith
And q axle DC components uq_tempDifference be the power network positive sequence voltage component, the positive sequence voltage component includes d axle positive sequences
Component of voltage usd*pAnd q axle positive sequence voltage components usq*p。
Optionally, the positive sequence voltage component of the parameter of electric machine based on the double-fed generator and the power network, really
The correction value of rotor current specified rate corresponding to unbalance grid failure is made, including：
According to formula Id *=k*usd*p*Lm/wsLsLrAnd Iq *=k*usq*p*Lm/wsLsLr, the rotor electricity is calculated
The correction value of specified rate is flowed, wherein, Id *For d shaft current correction values, Iq *For q shaft current correction values, k is transient state penalty coefficient, ws
For the line voltage positive sequence angle, θs pDifferential value, usd*pFor d axle positive sequence voltage components, usq*pFor q axle positive sequence voltage components,
LsFor stator self inductance, LrFor rotor self-induction, LmFor rotor mutual inductance.
Optionally, the transient state penalty coefficient k is specified according to the negative sequence voltage components Un and predeterminated voltage of the power network
Value Urated determinations, wherein, k=Un/Urated,
Optionally, rotor watt current specified rate, the reactive current specified rate of the power ring output based on current transformer
And the correction value of rotor current specified rate corresponding to the unbalance grid failure, determine that the target current ring of rotor gives
Electric current, including：
Rotor current is obtained, the rotor current includes the first phase current of rotor irA, the second phase current of rotor irBAnd turn
Sub- third phase electric current irC；
Obtain rotor position angle θr；
Based on the line voltage positive sequence angle, θs pAnd the rotor position angle θr, determine that the positive sequence of rotor-side turns
Poor angle, θsl P；
Based on the positive sequence slip angle, θsl PAnd the rotor current, determine the rotor watt current specified rate
irdAnd the rotor reactive current specified rate irq；
Determine the rotor watt current specified rate irdWith the q shaft currents correction value Iq *Difference be the d axles target
Given electric current, determines the rotor reactive current specified rate irqWith the d shaft currents correction value Id *Difference be the q axles mesh
The given electric current of mark.
Optionally, in addition to：
Based on the rotor watt current specified rate ird, rotor reactive current specified rate irqAnd the target current ring
Given electric current, determines rotor voltage controlled quentity controlled variable；
According to the rotor voltage controlled quentity controlled variable, target pulse control signal is determined, the target pulse control signal is used
In the three-phase windings for the rotor for controlling the double feedback electric engine.
A kind of control device of double-fed generator unbalance grid failure, including：
First acquisition module, for obtaining the parameter of electric machine of the double-fed generator, the parameter of electric machine includes stator certainly
Feel Ls, rotor self-induction LrAnd rotor mutual inductance Lm；
Second acquisition module, for obtaining grid line voltage, the grid line voltage includes the first line voltage UabAnd the
Two line voltage Ubc；
Computing module, for the positive sequence voltage component Up and negative phase-sequence of power network based on the grid line voltage, to be calculated
Component of voltage Un, the positive sequence voltage component include d axle positive sequence voltage components usd*pAnd q axle positive sequence voltage components usq*p, institute
Stating negative sequence voltage components includes d axle negative sequence voltage components usd*nAnd q axle negative sequence voltage components usq*n；
First determining module, for the positive sequence voltage of the parameter of electric machine based on the double-fed generator and the power network point
Amount, determines the correction value of rotor current specified rate corresponding to unbalance grid failure, and the correction value includes d shaft current amendments
Value Id *And q shaft current correction values Iq *；
Control module, for based on the negative sequence voltage components and default asymmetrical voltage fault reference value Uset,
Judge whether that unbalance grid failure occurs, if it is, the rotor watt current specified rate of the output of the power ring based on current transformer,
The correction value of rotor current specified rate corresponding to rotor reactive current specified rate and the unbalance grid failure, determine to turn
The target current ring of son gives electric current, and the target current ring gives electric current and given including the given electric current of d axles target and q axle targets
Determine electric current.
Optionally, the computing module includes：
First acquisition unit, for obtaining line voltage positive sequence angle, θs p, and according to the line voltage positive sequence angle, θs p
Line voltage negative phase-sequence angle, θ is calculateds n；
First determining unit, for based on the grid line voltage and the line voltage negative phase-sequence angle, θs n, determine
The positive sequence voltage component of the power network, the positive sequence voltage component include d axle positive sequence voltage components ud *With q axles positive sequence voltage point
Measure uq *。
Optionally, first determining unit includes：
First determination subelement, for by the grid line voltage according to the line voltage negative phase-sequence angle, θs nCarry out coordinate
Conversion, obtains line voltage d axis components udAnd line voltage q axis components uq；
Second determination subelement, for by the line voltage d axis components udAnd line voltage q axis components uqFiltered
Ripple processing, obtains d axle DC components ud_tempAnd q axle DC components uq_temp；
3rd determination subelement, for determining the line voltage d axis components udAnd line voltage q axis components uqWith institute
State d axle DC components ud_tempAnd q axle DC components uq_tempDifference be the power network positive sequence voltage component, the positive sequence
Component of voltage includes d axle positive sequence voltage components usd*pAnd q axle positive sequence voltage components usq*p。
Optionally, first determining module includes：
Computing unit, for according to formula Id *=k*usd*p*Lm/wsLsLrAnd Iq *=k*usq*p*Lm/wsLsLr, calculate
The correction value of the rotor current specified rate is obtained, wherein, Id *For d shaft current correction values, Iq *For q shaft current correction values, k is
Transient state penalty coefficient, wsFor the line voltage positive sequence angle, θs pDifferential value, usd*pFor d axle positive sequence voltage components, usq*pFor q
Axle positive sequence voltage component, LsFor stator self inductance, LrFor rotor self-induction, LmFor rotor mutual inductance.
Optionally, the computing unit is additionally operable to calculate the transient state penalty coefficient k,
The transient state penalty coefficient k is according to the negative sequence voltage components Un and predeterminated voltage rated value Urated of the power network
It is determined that wherein, k=Un/Urated,
Optionally, the control module includes：
Second acquisition unit, for obtaining rotor current, the rotor current includes the first phase current of rotor irA, rotor
Two-phase current irBAnd rotor third phase electric current irC；
3rd acquiring unit, for obtaining rotor position angle θr；
Second determining unit, for based on the line voltage positive sequence angle, θs pAnd the rotor position angle θr, really
Make the positive sequence slip angle, θ of rotor-sidesl P；
3rd determining unit, for based on the positive sequence slip angle, θsl PAnd the rotor current, determine described turn
Sub- watt current specified rate irdAnd the rotor reactive current specified rate irq；
4th determining unit, for determining the rotor watt current specified rate irdWith the q shaft currents correction value Iq *'s
Difference is that the d axles target gives electric current, determines the rotor reactive current specified rate irqWith the d shaft currents correction value Id *
Difference for the q axles target give electric current.
Optionally, in addition to：
Second determining module, for based on the rotor watt current specified rate ird, rotor reactive current specified rate irqWith
And the target current ring gives electric current, determines rotor voltage controlled quentity controlled variable；
3rd determining module, for according to the rotor voltage controlled quentity controlled variable, determining target pulse control signal, the mesh
Mark pulse control signal is used for the three-phase windings for controlling the rotor of the double feedback electric engine.
Based on above-mentioned technical proposal, the embodiment of the present invention provides a kind of controlling party of double-fed generator unbalance grid failure
Method, the parameter of electric machine and grid line voltage of the double-fed generator are obtained first, and determined based on the grid line voltage
The positive sequence voltage component and negative sequence voltage components of power network, it is then based on the positive sequence voltage of the parameter of electric machine and the power network
Component, determine the correction value of rotor current specified rate corresponding to unbalance grid failure.When unbalance grid event occurs for judgement
During barrier, the rotor watt current specified rate of power ring based on current transformer output, rotor reactive current specified rate and described repair
On the occasion of, determine rotor target current ring give electric current.It can be seen that the embodiment of the present invention provides a kind of double-fed generator asymmetry
The control method and device of electric network fault, the regulation to the negative sequence component of line voltage can be realized.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
The embodiment of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
The accompanying drawing of offer obtains other accompanying drawings.
Fig. 1 is that a kind of flow of the control method of double-fed generator unbalance grid failure provided in an embodiment of the present invention is shown
It is intended to；
Fig. 2 is a kind of signal acquisition schematic diagram of double-fed generator provided in an embodiment of the present invention；
Fig. 3 is a kind of another stream of the control method of double-fed generator unbalance grid failure provided in an embodiment of the present invention
Journey schematic diagram；
Fig. 4 is a kind of another stream of the control method of double-fed generator unbalance grid failure provided in an embodiment of the present invention
Journey schematic diagram；
Fig. 5 is a kind of another stream of the control method of double-fed generator unbalance grid failure provided in an embodiment of the present invention
Journey schematic diagram.
Embodiment
Generally, based on the double synchronous vector coordinate systems of positive-negative sequence, the rotor control needed under line voltage asymmetrical
Voltage is：
Wherein, LmFor motor mutual inductance, LsFor motor stator self-induction, VrFor rotor control voltage, Vr+、Vr- it is respectively to turn
The positive and negative sequence control voltage of son, Vgrid+、Vgrid- be respectively power network positive and negative sequence voltage.wsFor line voltage angular frequency, wrFor
Rotor angular frequency, wslip+=ws-wrFor positive sequence slip angular frequency, wslip-=ws+wrFor negative phase-sequence slip angular frequency.
It is not difficult to find out from formula, rotor positive sequence control voltage relation proportional to positive sequence slip, according to the rotating speed of unit
Range of operation, rotor angular frequency wrIt is larger, so positive sequence slip angular frequency wslip+ is relatively small, so as to rotor positive sequence control electricity
The amplitude of pressure is smaller.
And rotor negative phase-sequence control voltage relation proportional to negative phase-sequence slip, therefore, rotor negative phase-sequence control voltage has one
Close to 2 factor.So when unbalanced fault occurs in power network, less negative sequence voltage value Vgrid-meeting is by negative phase-sequence slip frequency
Rate wslip- amplifies, and with the asymmetric increase of power network, negative phase-sequence control voltage significantly increases, under conditions of DC voltage is certain
The requirement of required rotor control voltage amplitude can not have been met, now, rotor-side current regulator saturation, and then can cause
Forward-order current device defective regulator, now, generator absorbs from power network has positive sequence to have power and reactive power, deteriorates power network, no
Beneficial to the recovery of electric network fault.Also, the active energy accumulation of generating set, the risk of motor speed hypervelocity failure off-grid be present.
In order to solve the above problems, this patent proposes the double-fed rotor-side converter under a kind of unbalanced grid faults
Control method, it is possible to achieve effective control to rotor current, in unbalanced grid faults, reactive power is provided to power network,
Promote power network recovery, to power network feed-in active power, the rotating speed for mitigating unit jumps, improve double-fed wind power generator group
Fault ride-through capacity under unbalanced grid faults.
Referring to Fig. 1, Fig. 1 is a kind of controlling party of double-fed generator unbalance grid failure provided in an embodiment of the present invention
The schematic flow sheet of method, including step：
S11, the parameter of electric machine for obtaining the double-fed generator.
The parameter of electric machine includes stator self inductance Ls, rotor self-induction LrAnd rotor mutual inductance Lm, it is necessary to explanation, often
The parameter of electric machine of individual motor is the particular community parameter of motor, is fixed value, it will usually which mark is on the parameter board of motor, this step
The rapid relevant parameter that need to only read motor.
S12, obtain grid line voltage.
As shown in Fig. 2 the grid line voltage includes the first line voltage UabAnd the second line voltage Ubc.Usually using electricity
Pressure sensor carries out the acquisition of grid line voltage.
S13, based on the grid line voltage, the positive sequence voltage component Up and negative sequence voltage components of power network is calculated
Un。
Wherein, the positive sequence voltage component includes d axle positive sequence voltage components usd*pAnd q axle positive sequence voltage components usq*p,
The negative sequence voltage components include d axle negative sequence voltage components usd*nAnd q axle negative sequence voltage components usq*n。
Generally, grid line voltage calculates the positive sequence of power network after coordinate transformation by the positive and negative decoupling module of line voltage
Component of voltage and negative sequence voltage components.Specifically, can be realized by step as shown in Figure 3, it is as follows：
S31, obtain line voltage positive sequence angle, θs p, and according to the line voltage positive sequence angle, θs pPower network is calculated
Voltage negative phase-sequence angle, θs n。
Wherein it is possible to line voltage positive sequence angle, θ is obtained according to d shaft voltage orientation lock phases by phase-locked loop modules p, so
Line voltage negative phase-sequence angle, θ afterwardss nFor line voltage positive sequence angle, θs pIt is anti-phase, therefore, line voltage negative phase-sequence angle, θs n=-electricity
Net voltage positive sequence angle, θs p。
S32, based on the grid line voltage and the line voltage negative phase-sequence angle, θs n, determine the positive sequence of the power network
Component of voltage, the positive sequence voltage component include d axle positive sequence voltage components ud *And q axle positive sequence voltage components uq *。
Specifically, by the grid line voltage according to the line voltage negative phase-sequence angle, θs nCoordinate Conversion is carried out, obtains electricity
Net voltage d axis components udAnd line voltage q axis components uq。
Then, by the line voltage d axis components udAnd line voltage q axis components uqProcessing is filtered, obtains d axles
DC component ud_tempAnd q axle DC components uq_temp, wherein, filtering process can be filtered by low pass filter, but
It is not limited to this filtering mode.
Finally, the line voltage d axis components u is determineddAnd line voltage q axis components uqWith the d axles DC component
ud_tempAnd q axle DC components uq_tempDifference be the power network positive sequence voltage component, the positive sequence voltage component includes d
Axle positive sequence voltage component usd*pAnd q axle positive sequence voltage components usq*p.That is, usd*p=ud-ud_temp；usq*p=uq-uq_temp。
S14, the parameter of electric machine based on the double-fed generator and the power network positive sequence voltage component, it is not right to determine
Claim the correction value of rotor current specified rate corresponding to electric network fault, the correction value includes d shaft current correction values Id *And q axles electricity
Flow correction value Iq *；
Specifically, formula I can be passed throughd *=k*usd*p*Lm/wsLsLrAnd Iq *=k*usq*p*Lm/wsLsLr, calculate
To the correction value of the rotor current specified rate, wherein, Id *For d shaft current correction values, Iq *For q shaft current correction values, k is temporary
State penalty coefficient, wsFor the line voltage positive sequence angle, θs pDifferential value, usd*pFor d axle positive sequence voltage components, usq*pFor q axles
Positive sequence voltage component, LsFor stator self inductance, LrFor rotor self-induction, LmFor rotor mutual inductance.
Wherein, the transient state penalty coefficient k can be according to the negative sequence voltage components Un and predeterminated voltage volume of the power network
Definite value Urated is determined, specifically, k=Un/Urated,
S15, based on the negative sequence voltage components and default asymmetrical voltage fault reference value Uset, judge whether to send out
Raw unbalance grid failure, if it is, the rotor watt current specified rate of the output of the power ring based on current transformer, rotor is idle electricity
The correction value of rotor current specified rate corresponding to specified rate and the unbalance grid failure is flowed, determines the target electricity of rotor
Flow ring and give electric current, the target current ring gives electric current and gives electric current including the given electric current of d axles target and q axles target.
Specifically, the present embodiment additionally provides a kind of specific implementation step for obtaining target current ring and giving electric current, such as Fig. 4
It is shown, including step：
S41, obtain rotor current.
Wherein, the rotor current includes the first phase current of rotor irA, the second phase current of rotor irBAnd rotor third phase
Electric current irC, the present embodiment can obtain above-mentioned rotor current by current sensor.
S42, obtain rotor position angle θr。
Specifically, motor rotor position angle, θ can be obtained by encoderr。
S43, based on the line voltage positive sequence angle, θs pAnd the rotor position angle θr, determine rotor-side just
Sequence slip angle, θsl P。
Wherein, the positive sequence slip angle, θ of rotor-sidesl P=line voltage positive sequence angle, θs p- rotor position angle θr。
S44, based on the positive sequence slip angle, θsl PAnd the rotor current, determine the rotor watt current to
Quantitative irdAnd the rotor reactive current specified rate irq。
Specifically, can be according to positive sequence slip angle, θsl P, rotor current is transformed into two-phase rotation from three-phase static coordinate system
Turn coordinate system, and then obtain rotor watt current specified rate irdAnd the rotor reactive current specified rate irq。
S45, determine the rotor watt current specified rate irdWith the q shaft currents correction value Iq *Difference be the d axles
Target gives electric current, determines the rotor reactive current specified rate irqWith the d shaft currents correction value Id *Difference be the q
Axle target gives electric current.
That is, when unbalanced grid faults occur, correction value is cut into rotor current ring, now, rotor d axle watt currents
Specified rate irdSubtract q shaft current correction values Iq *, rotor reactive current specified rate irqSubtract d shaft current correction values Id *, i.e. determine d
Axle target gives electric current Id_ref=rotor watt current specified rate ird- q shaft current correction values Iq *, determine that q axles target gives electric current
Iq_ref=rotor reactive current specified rate irq- d shaft current correction values Id *。
It can be seen that the present embodiment is not on the basis of vector controlled structure is changed, it is especially suitable when power network occurs asymmetric
Under power network seriously asymmetric operating mode, it is proposed that a kind of improved current loop control structure, i.e. Id_ref=Ird-Iq*；Iq_ref=
Irq-Id*, the instruction of rotor d axles watt current subtracts q axle transient state compensation rates, and rotor q axle referenced reactive currents subtract d axles transient state benefit
The amount of repaying, i.e., the compensation rate of transient state component is superimposed on rotor current ring specified rate turns into the given of new rotor current ring, in electricity
During net stable state, compensation rate zero, meet stability of the system under Power System Steady-state.
Optionally, as shown in figure 5, on the basis of above-described embodiment, the double-fed generator that the present embodiment provides is asymmetric
The control method of electric network fault, in addition to step：
S51, based on the rotor watt current specified rate ird, rotor reactive current specified rate irqAnd the target electricity
Flow ring and give electric current, determine rotor voltage controlled quentity controlled variable；
S52, according to the rotor voltage controlled quentity controlled variable, determine target pulse control signal, the target pulse control letter
Number be used for control the double feedback electric engine rotor three-phase windings.
To sum up, the present embodiment has the following advantages that：
1st, on the basis of vector controlled structure is not changed, when power network occurs asymmetric, the power network that is particularly suitable for use in is serious
Under asymmetric operating mode, it is proposed that a kind of improved current loop control structure, i.e. Id_ref=Ird-Iq*；Iq_ref=Irq-Id*, rotor
The instruction of d axles watt current subtracts q axle transient state compensation rates, and rotor q axle referenced reactive currents subtract d axle transient state compensation rates, that is, is turning
The compensation rate of transient state component is superimposed on electron current ring specified rate turns into the given of new rotor current ring, in Power System Steady-state, mends
The amount of repaying is zero, meets stability of the system under Power System Steady-state.
2nd, according to the degree of asymmetry of line voltage in the compensation rate extraction of transient state component, by the flexible automatic regulations of parameter k
The size of compensation rate, the adaptive optimization extraction compensation rate under different power network asymmetry operating modes, due to carrying for transient state component
It is to be based on line voltage to take, and possesses the quick response to grid voltage change, meets system performance requirement under power network dynamic.
3rd, low pass filter has been used in the extraction of transient state component compensation rate, avoided in the specified rate of rotor current ring
DC quantity is introduced, is given so as to influence the power of unit, loses the original intention of the control effect of program realization.It is thus any to low
The improvement of bandpass filter, the method for converting and being related to improving, influenceing the power of the assembling unit are construed as the mutation of the program, replaced
Change scheme.
4th, the negative sequence component u of voltage is obtained using voltage positive-negative sequence coordinate system decoupling moduled *And uq *.Power network is calculated to bear
Sequence voltage value, to judge the unbalanced fault degree of power network, appoint two-phase suitable for any phase voltage transient state lifting of power network, power network
Voltage transient lifting, any phase voltage transient state of power network are fallen, power network appoints two-phase voltage transient state to fall, and do not differentiate between specific power network not
Symmetric fault type.
Except this, the present embodiment additionally provides a kind of control device of double-fed generator unbalance grid failure, including：
First acquisition module, for obtaining the parameter of electric machine of the double-fed generator, the parameter of electric machine includes stator certainly
Feel Ls, rotor self-induction LrAnd rotor mutual inductance Lm；
Second acquisition module, for obtaining grid line voltage, the grid line voltage includes the first line voltage UabAnd the
Two line voltage Ubc；
Computing module, for the positive sequence voltage component Up and negative phase-sequence of power network based on the grid line voltage, to be calculated
Component of voltage Un, the positive sequence voltage component include d axle positive sequence voltage components usd*pAnd q axle positive sequence voltage components usq*p, institute
Stating negative sequence voltage components includes d axle negative sequence voltage components usd*nAnd q axle negative sequence voltage components usq*n；
First determining module, for the positive sequence voltage of the parameter of electric machine based on the double-fed generator and the power network point
Amount, determines the correction value of rotor current specified rate corresponding to unbalance grid failure, and the correction value includes d shaft current amendments
Value Id *And q shaft current correction values Iq *；
Control module, for based on the negative sequence voltage components and default asymmetrical voltage fault reference value Uset,
Judge whether that unbalance grid failure occurs, if it is, the rotor watt current specified rate of the output of the power ring based on current transformer,
The correction value of rotor current specified rate corresponding to rotor reactive current specified rate and the unbalance grid failure, determine to turn
The target current ring of son gives electric current, and the target current ring gives electric current and given including the given electric current of d axles target and q axle targets
Determine electric current.
Optionally, the computing module includes：
First acquisition unit, for obtaining line voltage positive sequence angle, θs p, and according to the line voltage positive sequence angle, θs p
Line voltage negative phase-sequence angle, θ is calculateds n；
First determining unit, for based on the grid line voltage and the line voltage negative phase-sequence angle, θs n, determine
The positive sequence voltage component of the power network, the positive sequence voltage component include d axle positive sequence voltage components ud *With q axles positive sequence voltage point
Measure uq *。
Optionally, first determining unit includes：
First determination subelement, for by the grid line voltage according to the line voltage negative phase-sequence angle, θs nCarry out coordinate
Conversion, obtains line voltage d axis components udAnd line voltage q axis components uq；
Second determination subelement, for by the line voltage d axis components udAnd line voltage q axis components uqFiltered
Ripple processing, obtains d axle DC components ud_tempAnd q axle DC components uq_temp；
3rd determination subelement, for determining the line voltage d axis components udAnd line voltage q axis components uqWith institute
State d axle DC components ud_tempAnd q axle DC components uq_tempDifference be the power network positive sequence voltage component, the positive sequence
Component of voltage includes d axle positive sequence voltage components usd*pAnd q axle positive sequence voltage components usq*p。
Optionally, first determining module includes：
Computing unit, for according to formula Id *=k*usd*p*Lm/wsLsLrAnd Iq *=k*usq*p*Lm/wsLsLr, calculate
The correction value of the rotor current specified rate is obtained, wherein, Id *For d shaft current correction values, Iq *For q shaft current correction values, k is
Transient state penalty coefficient, wsFor the line voltage positive sequence angle, θs pDifferential value, usd*pFor d axle positive sequence voltage components, usq*pFor q
Axle positive sequence voltage component, LsFor stator self inductance, LrFor rotor self-induction, LmFor rotor mutual inductance.
Optionally, the computing unit is additionally operable to calculate the transient state penalty coefficient k,
The transient state penalty coefficient k is according to the negative sequence voltage components Un and predeterminated voltage rated value Urated of the power network
It is determined that wherein, k=Un/Urated,
Optionally, the control module includes：
Second acquisition unit, for obtaining rotor current, the rotor current includes the first phase current of rotor irA, rotor
Two-phase current irBAnd rotor third phase electric current irC；
3rd acquiring unit, for obtaining rotor position angle θr；
Second determining unit, for based on the line voltage positive sequence angle, θs pAnd the rotor position angle θr, really
Make the positive sequence slip angle, θ of rotor-sidesl P；
3rd determining unit, for based on the positive sequence slip angle, θsl PAnd the rotor current, determine described turn
Sub- watt current specified rate irdAnd the rotor reactive current specified rate irq；
4th determining unit, for determining the rotor watt current specified rate irdWith the q shaft currents correction value Iq *'s
Difference is that the d axles target gives electric current, determines the rotor reactive current specified rate irqWith the d shaft currents correction value Id *
Difference for the q axles target give electric current.
Optionally, in addition to：
Second determining module, for based on the rotor watt current specified rate ird, rotor reactive current specified rate irqWith
And the target current ring gives electric current, determines rotor voltage controlled quentity controlled variable；
3rd determining module, for according to the rotor voltage controlled quentity controlled variable, determining target pulse control signal, the mesh
Mark pulse control signal is used for the three-phase windings for controlling the rotor of the double feedback electric engine.
Its principle of device refers to above method embodiment.
Each embodiment is described by the way of progressive in this specification, what each embodiment stressed be and other
The difference of embodiment, between each embodiment identical similar portion mutually referring to.For device disclosed in embodiment
For, because it is corresponded to the method disclosed in Example, so description is fairly simple, related part is said referring to method part
It is bright.
Professional further appreciates that, with reference to the unit of each example of the embodiments described herein description
And algorithm steps, can be realized with electronic hardware, computer software or the combination of the two, in order to clearly demonstrate hardware and
The interchangeability of software, the composition and step of each example are generally described according to function in the above description.These
Function is performed with hardware or software mode actually, application-specific and design constraint depending on technical scheme.Specialty
Technical staff can realize described function using distinct methods to each specific application, but this realization should not
Think beyond the scope of this invention.
Directly it can be held with reference to the step of method or algorithm that the embodiments described herein describes with hardware, processor
Capable software module, or the two combination are implemented.Software module can be placed in random access memory (RAM), internal memory, read-only deposit
Reservoir (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technology
In any other form of storage medium well known in field.
The foregoing description of the disclosed embodiments, professional and technical personnel in the field are enable to realize or using the present invention.
A variety of modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The most wide scope caused.
Claims (14)
- A kind of 1. control method of double-fed generator unbalance grid failure, it is characterised in that including：The parameter of electric machine of the double-fed generator is obtained, the parameter of electric machine includes stator self inductance, rotor self-induction and rotor Mutual inductance；Grid line voltage is obtained, the grid line voltage includes the first line voltage and the second line voltage；Based on the grid line voltage, the positive sequence voltage component and negative sequence voltage components of power network, the positive sequence electricity is calculated Pressure component includes d axle positive sequence voltage components and q axle positive sequence voltage components, and the negative sequence voltage components include d axle negative sequence voltages Component and q axle negative sequence voltage components；The positive sequence voltage component of the parameter of electric machine and the power network based on the double-fed generator, determine unbalance grid event The correction value of rotor current specified rate corresponding to barrier, the correction value include d shaft currents correction value and q shaft current correction values；Based on the negative sequence voltage components and default asymmetrical voltage fault reference value, judge whether that unbalance grid occurs Failure, if it is, based on current transformer power ring output rotor watt current specified rate, rotor reactive current specified rate and The correction value of rotor current specified rate corresponding to the unbalance grid failure, determine the given electricity of target current ring of rotor Stream, the target current ring, which gives electric current, includes the given electric current of d axles target and the given electric current of q axles target.
- 2. the control method of double-fed generator unbalance grid failure according to claim 1, it is characterised in that the base In the grid line voltage, the positive sequence voltage component and negative sequence voltage components of power network is calculated, including：Line voltage positive sequence angle is obtained, and line voltage negative phase-sequence angle is obtained according to the line voltage positive sequence angle calculation；Based on the grid line voltage and the line voltage negative phase-sequence angle, the positive sequence voltage component of the power network is determined, The positive sequence voltage component includes d axle positive sequence voltage components with q axle positive sequence voltage components.
- 3. the control method of double-fed generator unbalance grid failure according to claim 2, it is characterised in that the base In the grid line voltage and the line voltage negative phase-sequence angle, the positive sequence voltage component of the power network is determined, including：The grid line voltage is subjected to Coordinate Conversion according to the line voltage negative phase-sequence angle, obtains line voltage d axis components And line voltage q axis components；The line voltage d axis components and line voltage q axis components are filtered processing, obtain d axles DC component and q Axle DC component；Determine the line voltage d axis components and line voltage q axis components and the d axles DC component and q axles direct current point The difference of amount is the positive sequence voltage component of the power network, and the positive sequence voltage component is including d axle positive sequence voltage components and q axles just Sequence voltage component.
- 4. the control method of double-fed generator unbalance grid failure according to claim 2, it is characterised in that the base In the parameter of electric machine of the double-fed generator and the positive sequence voltage component of the power network, determine that unbalance grid failure is corresponding Rotor current specified rate correction value, including：According to formula Id *=k*usd*p*Lm/wsLsLrAnd Iq *=k*usq*p*Lm/wsLsLr, be calculated the rotor current to Quantitative correction value, wherein, Id *For d shaft current correction values, Iq *For q shaft current correction values, k is transient state penalty coefficient, wsFor institute State line voltage positive sequence angle, θs pDifferential value, usd* p is d axle positive sequence voltage components, usq* p is q axle positive sequence voltage components, Ls For stator self inductance, LrFor rotor self-induction, LmFor rotor mutual inductance.
- 5. the control method of double-fed generator unbalance grid failure according to claim 4, it is characterised in thatThe transient state penalty coefficient k is true according to the negative sequence voltage components Un and predeterminated voltage rated value Urated of the power network It is fixed, wherein, k=Un/Urated,
- 6. the control method of double-fed generator unbalance grid failure according to claim 1, it is characterised in that the base In rotor watt current specified rate, reactive current specified rate and the unbalance grid failure that the power ring of current transformer exports The correction value of corresponding rotor current specified rate, determine that the target current ring of rotor gives electric current, including：Rotor current is obtained, the rotor current includes the phase current of rotor first, the phase current of rotor second and rotor third phase Electric current；Obtain rotor position angle；Based on the line voltage positive sequence angle and the rotor position angle, the positive sequence slip angle of rotor-side is determined；Based on the positive sequence slip angle and the rotor current, the rotor watt current specified rate and described is determined Rotor reactive current specified rate；Determine that the rotor watt current specified rate and the difference of the q shaft currents correction value give electric current for the d axles target, Determine that the rotor reactive current specified rate and the difference of the d shaft currents correction value give electric current for the q axles target.
- 7. the control method of double-fed generator unbalance grid failure according to claim 6, it is characterised in that also wrap Include：Electric current is given based on the rotor watt current specified rate, rotor reactive current specified rate and the target current ring, Determine rotor voltage controlled quentity controlled variable；According to the rotor voltage controlled quentity controlled variable, target pulse control signal is determined, the target pulse control signal is used to control Make the three-phase windings of the rotor of the double feedback electric engine.
- A kind of 8. control device of double-fed generator unbalance grid failure, it is characterised in that including：First acquisition module, for obtaining the parameter of electric machine of the double-fed generator, the parameter of electric machine includes stator self inductance, turned Sub- self-induction and rotor mutual inductance；Second acquisition module, for obtaining grid line voltage, the grid line voltage includes the first line voltage and the second line electricity Pressure；Computing module, for based on the grid line voltage, the positive sequence voltage component and negative sequence voltage that power network is calculated to divide Amount, the positive sequence voltage component include d axle positive sequence voltage components and q axle positive sequence voltage components, the negative sequence voltage components bag Include d axles negative sequence voltage components and q axle negative sequence voltage components；First determining module, for the parameter of electric machine based on the double-fed generator and the positive sequence voltage component of the power network, The correction value of rotor current specified rate corresponding to unbalance grid failure is determined, the correction value includes d shaft current correction values And q shaft current correction values；Control module, for based on the negative sequence voltage components and default asymmetrical voltage fault reference value, judging whether Generation unbalance grid failure, if it is, based on current transformer power ring output rotor watt current specified rate, rotor is idle The correction value of rotor current specified rate corresponding to given value of current amount and the unbalance grid failure, determine the target of rotor Electric current loop gives electric current, and the target current ring, which gives electric current, includes the given electric current of d axles target and the given electric current of q axles target.
- 9. the control device of double-fed generator unbalance grid failure according to claim 8, it is characterised in that the meter Calculating module includes：First acquisition unit, for obtaining line voltage positive sequence angle, and according to the line voltage positive sequence angle, θsP is calculated To line voltage negative phase-sequence angle；First determining unit, for based on the grid line voltage and the line voltage negative phase-sequence angle, determining the electricity The positive sequence voltage component of net, the positive sequence voltage component include d axle positive sequence voltage components with q axle positive sequence voltage components.
- 10. the control device of double-fed generator unbalance grid failure according to claim 9, it is characterised in that described First determining unit includes：First determination subelement, for the grid line voltage to be carried out into Coordinate Conversion according to the line voltage negative phase-sequence angle, Obtain line voltage d axis components and line voltage q axis components；Second determination subelement, for the line voltage d axis components and line voltage q axis components to be filtered into processing, Obtain d axles DC component and q axle DC components；3rd determination subelement, for determining that the line voltage d axis components and line voltage q axis components and the d axles are straight The difference of flow component and q axle DC components is the positive sequence voltage component of the power network, and the positive sequence voltage component is including d axles just Sequence voltage component and q axle positive sequence voltage components.
- 11. the control device of double-fed generator unbalance grid failure according to claim 9, it is characterised in that described First determining module includes：Computing unit, for according to formula Id *=k*usd*p*Lm/wsLsLrAnd Iq *=k*usq*p*Lm/wsLsLr, it is calculated The correction value of the rotor current specified rate, wherein, Id *For d shaft current correction values, Iq *For q shaft current correction values, k is transient state Penalty coefficient, wsFor the line voltage positive sequence angle, θsP differential value, usd* p is d axle positive sequence voltage components, usq* p is q axles Positive sequence voltage component, LsFor stator self inductance, LrFor rotor self-induction, LmFor rotor mutual inductance.
- 12. the control device of double-fed generator unbalance grid failure according to claim 11, it is characterised in that described Computing unit is additionally operable to calculate the transient state penalty coefficient k,The transient state penalty coefficient k is true according to the negative sequence voltage components Un and predeterminated voltage rated value Urated of the power network It is fixed, wherein, k=Un/Urated,
- 13. the control device of double-fed generator unbalance grid failure according to claim 8, it is characterised in that described Control module includes：Second acquisition unit, for obtaining rotor current, the rotor current includes the phase current of rotor first, rotor two phase electricity Stream and rotor third phase electric current；3rd acquiring unit, for obtaining rotor position angle；Second determining unit, for based on the line voltage positive sequence angle and the rotor position angle, determining rotor The positive sequence slip angle of side；3rd determining unit, for based on the positive sequence slip angle and the rotor current, determining that the rotor is active Given value of current amount and the rotor reactive current specified rate；4th determining unit, for determining that the rotor watt current specified rate and the difference of the q shaft currents correction value are institute State d axles target and give electric current, determine that the rotor reactive current specified rate and the difference of the d shaft currents correction value are the q Axle target gives electric current.
- 14. the control device of double-fed generator unbalance grid failure according to claim 6, it is characterised in that also wrap Include：Second determining module, for based on rotor watt current specified rate, rotor reactive current specified rate and the mesh Mark electric current loop and give electric current, determine rotor voltage controlled quentity controlled variable；3rd determining module, for according to the rotor voltage controlled quentity controlled variable, determining target pulse control signal, the target arteries and veins Rush the three-phase windings that control signal is used to control the rotor of the double feedback electric engine.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109755964A (en) * | 2019-03-18 | 2019-05-14 | 哈尔滨工业大学 | The control method of double-fed fan motor unit stability under a kind of raising weak grid conditions |
| CN111509773A (en) * | 2020-04-24 | 2020-08-07 | 浙江运达风电股份有限公司 | Voltage source type wind turbine generator fault ride-through control method suitable for weak power grid |
| CN111987953A (en) * | 2020-08-07 | 2020-11-24 | 山东大学 | Method and system for controlling currents of positive and negative sequence rotors of double-fed fan with single dq control structure |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101272119A (en) * | 2008-04-07 | 2008-09-24 | 国网南京自动化研究院 | Method for restraining imbalance and deformation of double-feedback type wind generator set stator current |
| CN101710715A (en) * | 2009-11-26 | 2010-05-19 | 上海大学 | System and method for controlling low voltage ride through of double-feed induction wind driven generator in power grid voltage instantaneous drop |
| US20140138949A1 (en) * | 2012-04-24 | 2014-05-22 | Masdar Institute Of Science And Technology | Fault handling system for doubly fed induction generator |
| CN105634011A (en) * | 2016-01-28 | 2016-06-01 | 阳光电源股份有限公司 | Control method and control device for wind power generation system |
-
2017
- 2017-10-26 CN CN201711013248.1A patent/CN107658913B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101272119A (en) * | 2008-04-07 | 2008-09-24 | 国网南京自动化研究院 | Method for restraining imbalance and deformation of double-feedback type wind generator set stator current |
| CN101710715A (en) * | 2009-11-26 | 2010-05-19 | 上海大学 | System and method for controlling low voltage ride through of double-feed induction wind driven generator in power grid voltage instantaneous drop |
| US20140138949A1 (en) * | 2012-04-24 | 2014-05-22 | Masdar Institute Of Science And Technology | Fault handling system for doubly fed induction generator |
| CN105634011A (en) * | 2016-01-28 | 2016-06-01 | 阳光电源股份有限公司 | Control method and control device for wind power generation system |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109755964A (en) * | 2019-03-18 | 2019-05-14 | 哈尔滨工业大学 | The control method of double-fed fan motor unit stability under a kind of raising weak grid conditions |
| CN109755964B (en) * | 2019-03-18 | 2022-06-07 | 哈尔滨工业大学 | Control method for improving stability of double-fed wind turbine generator under weak grid condition |
| CN111509773A (en) * | 2020-04-24 | 2020-08-07 | 浙江运达风电股份有限公司 | Voltage source type wind turbine generator fault ride-through control method suitable for weak power grid |
| CN111509773B (en) * | 2020-04-24 | 2021-08-17 | 浙江运达风电股份有限公司 | Voltage source type wind turbine generator fault ride-through control method suitable for weak power grid |
| CN111987953A (en) * | 2020-08-07 | 2020-11-24 | 山东大学 | Method and system for controlling currents of positive and negative sequence rotors of double-fed fan with single dq control structure |
| CN111987953B (en) * | 2020-08-07 | 2021-12-28 | 山东大学 | Method and system for controlling currents of positive and negative sequence rotors of double-fed fan with single dq control structure |
| US11939961B2 (en) * | 2020-08-07 | 2024-03-26 | Shandong University | Method and system of positive and negative sequence rotor currents control for doubly-fed induction generator-based wind turbines under single dq-PI control structure |
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