CN106532776A - Double-feed converter low voltage ride-trough control method based on redundancy topology - Google Patents
Double-feed converter low voltage ride-trough control method based on redundancy topology Download PDFInfo
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- 238000012423 maintenance Methods 0.000 claims description 4
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- H02J3/386—
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- 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 relates to the technical field of electric power electronic application and provides a double-feed converter low voltage ride-trough control method based on the redundancy topology. The method comprises following steps of (1) establishing a describing equation of a low voltage ride-through process; (2) designing a four-bridge arm topology structure; and (3) designing a program flow chart. According to the invention, through the optimized topology structure, redundant bridge arms are respectively added on a machine-side converter and a net-side converter; when an IGBT power device is damaged, the method can be automatically switched to the redundant bridge arm for working; through a redundant bridge arm controller, flexible bridge arm selection of a four-bridge arm three-phase system is achieved; and by combining the double-feed converter low voltage ride-trough control method, the low-voltage ride-through function of a double-feed unit is achieved and requirements on grid connection of a wind power plant imposed by a power grid are met.
Description
Technical field
The present invention relates to a kind of double-feed current transformer low voltage traversing control method based on redundant topology, belongs to power electronics
Applied technical field.
Background technology
Approved by everybody with the continuous progressive of wind generating technology and increasingly, the installed capacity of wind power generating set just by
Year increases, therefore the impact to power system is also constantly increasing.When power system apoplexy Denso machine capacity ratio is larger,
After electric power system fault causes Voltage Drop, the wind energy turbine set excision as power supply can have a strong impact on the stability of system operation, this
Require that Wind turbines have low voltage ride-through capability, it is ensured that Wind turbines are uninterruptedly incorporated into the power networks after system jam.Mesh
The front scheme for realizing low voltage ride-through capability typically has three kinds：One is, employs rotor short-circuit resist technology, and two are, introduces new
Type topological structure, three are, using rational excitation con-trol algorithm.In three of the above scheme, all apply at present, while
There are respective pluses and minuses.
The content of the invention
In order to overcome the shortcomings of that prior art is present, it is an object of the present invention to provide a kind of double-fed unsteady flow based on redundant topology
Device low voltage traversing control method, the method are respectively increased in pusher side current transformer and net side current transformer by the topological structure of optimization
By redundancy bridge arm controller, one redundancy bridge arm, realizes that the flexible bridge arm of four bridge legs three-phase system is selected, then in conjunction with double-fed
Current transformer low voltage traversing control method, realizes the low voltage ride-through function of double-fed unit, meets electrical network to wind farm grid-connected
Require.
In order to realize foregoing invention purpose, in the presence of solving the problems, such as prior art, the technical scheme that the present invention takes
It is：A kind of double-feed current transformer low voltage traversing control method based on redundant topology, comprises the following steps：
Step 1, the descriptive equation for setting up low voltage crossing process, specifically include following sub-step：
A when double-fed unit occurs low-voltage, () directly results in that overcurrent occurs in doubly-fed generation machine rotor and current transformer is straight
There is over-voltage condition in stream side, it is considered in the case of symmetrically falling, the voltage equation and flux linkage equations vector form of double-fed generator
It is described by formula (1), (2),
In formula (1), (2), ω represents double-fed generator angular velocity of rotation, vsRepresent double-fed generator stator voltage vector, vr
Represent double-fed generator rotor voltage vector, isRepresent double-fed generator stator current vector, irRepresent doubly-fed generation machine rotor electricity
Flow vector, ψsRepresent double-fed generator stator magnetic linkage vector, ψrRepresent double-fed generator rotor flux linkage vector, RsRepresent that double-fed is sent out
Motor stator resistance, RrRepresent double-fed generator rotor resistance, LmRepresent mutual inductance, LsRepresent double-fed generator stator self inductance, LrTable
Show doubly-fed generation machine rotor self-induction, p represents differential operator, obtained by formula (2),
In formula (3),Transient inductance is represented, formula (3) is brought in formula (1) and is obtained,
When () assumes that doubly-fed generation machine rotor is opened a way b, double-fed generator rotor-side voltage equation is,
In formula (5), vr0Voltage when representing that doubly-fed generation machine rotor is opened a way, when double-fed generator steady-state operation, double-fed is sent out
Motor stator voltage vector is,
In formula (6), VsRepresent double-fed generator stator voltage amplitude, ωsSynchronous rotary angular speed is represented,Represent rotation
Component；
C () is obtained by formula (1) when double-fed generator stator resistance is ignored,
Formula (7) is brought in formula (5) and is obtained,
In formula (8), ωr=ωs- ω, s=ωr/ωsRepresent revolutional slip, when non-open circuit it is controllable in the case of,
In formula (9), due to RrWith σ LrIt is comparatively small, and double-fed generator rotor frequency is relatively low, vrAnd vr0Difference also very
It is little, it is assumed that when line voltage is in t=t0When symmetrically dropping into zero, the stator voltage vector of double-fed generator is,
According to formula (1) and (2), the differential equation of first order of double-fed generator stator magnetic linkage is obtained,
Solve above-mentioned differential equation of first order to obtain,
In formula (12), due to now vsFall to 0, ψsIt is unrelated with line voltage, and magnetic linkage can not be mutated, this DC component magnetic
Chain part is only relevant with the transient process fallen, or claims free component ψsn, τs=Ls/RsRepresent that the doubly-fed generation machine stator time is normal
Number；
Step 2, design four bridge legs topological structure, specifically include following sub-step：
(a), in conventional tri- bridge arm topological structures of double PWM, respectively in original pusher side current transformer and net side current transformer
Increase a bridge arm, constitute four bridge legs topological structure, the redundancy bridge arm of increase is T1 ' T2 ' and T7 ' T8 '；
B (), in pusher side current transformer and net side current transformer, each one redundancy bridge arm selector of increase is the choosing of redundancy bridge arm
Device 1 and redundancy bridge arm selector 2 are selected, for realizing the selection of four bridge legs；
(c), in real work, after finding that one of bridge arm is damaged, can be switched to above redundancy bridge arm after
Continuous work, while providing alarm status, reminds owner to be overhauled, and then has reached the mesh generated electricity with calm maintenance in strong wind
's；
(d), using Crowbar technologies as double-fed generator rotor short-circuit resist technology an effective way, can be with
The effective protection of current transformer is realized in the case where overcurrent and over-voltage condition occurs in current transformer, is passed through at the low voltage crossing generation moment
Increase double-fed generator rotor resistance, that is, short circuit Crowbar resistance to reduce double-fed generator rotor short-circuit overcurrent, one
Denier Crowbar resistance is shorted rear double-fed generator and is then changed into a common asynchronous machine, with the increasing of Crowbar resistance
Greatly, its power factor is improved, therefore on the premise of input mechanical output is certain, can effectively reduce double-fed generator
Rotor short-circuit current amplitude；
Step 3, design program flow chart, specifically include following sub-step：
(a), need according to the hardware fault of operation current transformer judging the bridge arm that is out of order, then selected by redundancy bridge arm
Device cuts off failure bridge arm, the bridge arm of normal operation input；
The state confirmation low voltage crossing state of (b), needs according to line voltage, if low voltage crossing state, then
Into low voltage crossing control, if it is not, then low piercing into capable process according to non-；
(c), need according to overcurrent and the situation of overvoltage, and the situation of grid voltage sags, confirm that Crowbar is moved
Make rule.
Present invention has the advantages that：A kind of double-feed current transformer low voltage traversing control method based on redundant topology, including
Following steps：(1) descriptive equation of low voltage crossing process is set up, (2) design four bridge legs topological structure, (3) design program flow
Journey block diagram.Prior art is compared, and the present invention can further improve the reliability of current transformer by the topology design of redundancy bridge arm,
The work of redundancy bridge arm can be automatically switched in the situation for the damage of IGBT power devices occur；By the work of redundancy bridge arm controller
With can flexibly realize automatic switchover of four bridge arms in three-phase loop；With reference to the low voltage traversing control method of design, can
To realize the low voltage crossing of double-fed unit.
Description of the drawings
Fig. 1 is present system topology diagram.
Fig. 2 is the inventive method flow chart of steps.
Fig. 3 is redundancy arm selector control flow chart of the present invention.
Fig. 4 is Voltage Drop decision flow chart of the present invention.
Fig. 5 is low voltage crossing control flow chart of the present invention.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.
As shown in figure 1, in conventional tri- bridge arm topological structures of double PWM, in original pusher side current transformer and net side unsteady flow
Respectively increase a redundancy bridge arm in device, i.e. T1 ' T2 ' and T7 ' T8 ' constitute four bridge legs topological structure, and in pusher side current transformer
Respectively and a diode is connect between power device T1, T2, T3, T4, T5, T6, T1 ' and T2 ' colelctor electrodes-emitter stage, in net side
Respectively and one two is connect between power device T7, T8, T9, T10, T11, T12, T7 ' and T8 ' colelctor electrodes-emitter stage in current transformer
Pole pipe.In pusher side current transformer, power device T1, T3, T5, T1 ' colelctor electrodes are connected together, and T2, T4, T6, T2 ' emitter stages are connected
Together.In net side current transformer, power device T7, T9, T11, T7 ' colelctor electrodes are connected together, T8, T10, T12, T8 ' emitter stages
It is connected together.In addition, increasing a redundancy bridge arm selector 1 and redundancy bridge in pusher side current transformer and net side current transformer respectively
Arm selector 2.Wherein：Redundancy bridge arm selector 1 respectively with power device T1, T3, T5, T1 ' expelling plates, T2, T4, T6, T2 ' collection
Electrode be connected, redundancy bridge arm selector 2 respectively with power device T7, T9, T11, T7 ' expelling plates, T8, T10, T12, T8 ' current collections
Extremely it is connected.For realizing the selection of four bridge legs, after finding that one of bridge arm is damaged, can be switched to above redundancy bridge arm
Work on, while providing alarm status, remind owner to be overhauled, and then reached the mesh generated electricity with calm maintenance in strong wind
's.Redundancy bridge arm selector 1 is also connected with reactor respectively by three-phase power line, reactor by three-phase power line respectively with
Double-fed wind power generator rotor is connected.Redundancy bridge arm selector 2 is connected with transformer respectively by three-phase power line, and transformer leads to
Cross three-phase power line to be connected with electrical network respectively.Crowbar is connected with double-fed wind power generator rotor respectively by three-phase power line,
As an effective way of rotor short-circuit resist technology, can realize when overcurrent and overvoltage occurs in current transformer
The effective protection of current transformer.The generation moment is worn by increasing rotor resistance, that is, short circuit Crowbar resistance to reduce turning low
Sub- short circuit overcurrent.It is changed into a common asynchronous machine if double feedback electric engine after Crowbar resistance is shorted, it is known that with
The increase of Crowbar resistance, its power factor are improved, therefore on the premise of input mechanical output is certain, can be effective
Reduction rotor short-circuit current amplitude.
As shown in Fig. 2 a kind of double-feed current transformer low voltage traversing control method based on redundant topology, including following step
Suddenly：
Step 1, the descriptive equation for setting up low voltage crossing process, specifically include following sub-step：
A when double-fed unit occurs low-voltage, () directly results in that overcurrent occurs in doubly-fed generation machine rotor and current transformer is straight
There is over-voltage condition in stream side, it is considered in the case of symmetrically falling, the voltage equation and flux linkage equations vector form of double-fed generator
It is described by formula (1), (2),
In formula (1), (2), ω represents double-fed generator angular velocity of rotation, vsRepresent double-fed generator stator voltage vector, vr
Represent double-fed generator rotor voltage vector, isRepresent double-fed generator stator current vector, irRepresent doubly-fed generation machine rotor electricity
Flow vector, ψsRepresent double-fed generator stator magnetic linkage vector, ψrRepresent double-fed generator rotor flux linkage vector, RsRepresent that double-fed is sent out
Motor stator resistance, RrRepresent double-fed generator rotor resistance, LmRepresent mutual inductance, LsRepresent double-fed generator stator self inductance, LrTable
Show doubly-fed generation machine rotor self-induction, p represents differential operator, obtained by formula (2),
In formula (3),Transient inductance is represented, formula (3) is brought in formula (1) and is obtained,
When () assumes that doubly-fed generation machine rotor is opened a way b, double-fed generator rotor-side voltage equation is,
In formula (5), vr0Voltage when representing that doubly-fed generation machine rotor is opened a way, when double-fed generator steady-state operation, double-fed is sent out
Motor stator voltage vector is,
In formula (6), VsRepresent double-fed generator stator voltage amplitude, ωsSynchronous rotary angular speed is represented,Represent rotation
Turn component；
C () is obtained by formula (1) when double-fed generator stator resistance is ignored,
Formula (7) is brought in formula (5) and is obtained,
In formula (8), ωr=ωs- ω, s=ωr/ωsRepresent revolutional slip, when non-open circuit it is controllable in the case of,
In formula (9), due to RrWith σ LrIt is comparatively small, and double-fed generator rotor frequency is relatively low, vrAnd vr0Difference also very
It is little, it is assumed that when line voltage is in t=t0When symmetrically dropping into zero, the stator voltage vector of double-fed generator is,
According to formula (1) and (2), the differential equation of first order of double-fed generator stator magnetic linkage is obtained,
Solve above-mentioned differential equation of first order to obtain,
In formula (12), due to now vsFall to 0, ψsIt is unrelated with line voltage, and magnetic linkage can not be mutated, this flip-flop point
Amount magnetic linkage part is only relevant with the transient process fallen, or claims free component ψsn, τs=Ls/RsWhen representing doubly-fed generation machine stator
Between constant；
Step 2, design four bridge legs topological structure, specifically include following sub-step：
(a), in conventional tri- bridge arm topological structures of double PWM, respectively in original pusher side current transformer and net side current transformer
Increase a bridge arm, constitute four bridge legs topological structure, the redundancy bridge arm of increase is T1 ' T2 ' and T7 ' T8 '；
B (), in pusher side current transformer and net side current transformer, each one redundancy bridge arm selector of increase is the choosing of redundancy bridge arm
Device 1 and redundancy bridge arm selector 2 are selected, for realizing the selection of four bridge legs；
(c), in real work, after finding that one of bridge arm is damaged, can be switched to above redundancy bridge arm after
Continuous work, while providing alarm status, reminds owner to be overhauled, and then has reached the mesh generated electricity with calm maintenance in strong wind
's；
(d), using Crowbar technologies as double-fed generator rotor short-circuit resist technology an effective way, can be with
The effective protection of current transformer is realized in the case where overcurrent and over-voltage condition occurs in current transformer, is passed through at the low voltage crossing generation moment
Increase double-fed generator rotor resistance, that is, short circuit Crowbar resistance to reduce double-fed generator rotor short-circuit overcurrent, one
Denier Crowbar resistance is shorted rear double-fed generator and is then changed into a common asynchronous machine, with the increasing of Crowbar resistance
Greatly, its power factor is improved, therefore on the premise of input mechanical output is certain, can effectively reduce double-fed generator
Rotor short-circuit current amplitude；
Step 3, design program flow chart, specifically include following sub-step：
(a), need according to the hardware fault of operation current transformer judging the bridge arm that is out of order, then selected by redundancy bridge arm
Device cuts off failure bridge arm, and the bridge arm of normal operation input, redundancy arm selector control flow chart are as shown in Figure 3.
The state confirmation low voltage crossing state of (b), needs according to line voltage, if low voltage crossing state, then
Into low voltage crossing control, if it is not, then according to it is non-it is low pierce into capable process, Voltage Drop decision flow chart is as shown in Figure 4.
(c), need according to overcurrent and the situation of overvoltage, and the situation of grid voltage sags, confirm that Crowbar is moved
Make rule, low voltage crossing control flow chart is as shown in Figure 5.
Claims (1)
1. a kind of double-feed current transformer low voltage traversing control method based on redundant topology, it is characterised in that comprise the following steps：
Step 1, the descriptive equation for setting up low voltage crossing process, specifically include following sub-step：
A () directly results in doubly-fed generation machine rotor and overcurrent and current transformer DC side occurs when double-fed unit occurs low-voltage
There is over-voltage condition, it is considered to which, in the case of symmetrically falling, the voltage equation and flux linkage equations vector form of double-fed generator pass through
Formula (1), (2) are described,
In formula (1), (2), ω represents double-fed generator angular velocity of rotation, vsRepresent double-fed generator stator voltage vector, vrRepresent
Double-fed generator rotor voltage vector, isRepresent double-fed generator stator current vector, irRepresent double-fed generator rotor current arrow
Amount, ψsRepresent double-fed generator stator magnetic linkage vector, ψrRepresent double-fed generator rotor flux linkage vector, RsRepresent double-fed generator
Stator resistance, RrRepresent double-fed generator rotor resistance, LmRepresent mutual inductance, LsRepresent double-fed generator stator self inductance, LrRepresent double
Generator amature self-induction is presented, p represents differential operator, obtained by formula (2),
In formula (3),Transient inductance is represented, formula (3) is brought in formula (1) and is obtained,
When () assumes that doubly-fed generation machine rotor is opened a way b, double-fed generator rotor-side voltage equation is,
In formula (5), vr0Voltage when representing that doubly-fed generation machine rotor is opened a way, when double-fed generator steady-state operation, double-fed generator
Stator voltage vector is,
In formula (6), VsRepresent double-fed generator stator voltage amplitude, ωsSynchronous rotary angular speed is represented,Represent rotation point
Amount；
C () is obtained by formula (1) when double-fed generator stator resistance is ignored,
Formula (7) is brought in formula (5) and is obtained,
In formula (8), ωr=ωs- ω, s=ωr/ωsRepresent revolutional slip, when non-open circuit it is controllable in the case of,
In formula (9), due to RrWith σ LrIt is comparatively small, and double-fed generator rotor frequency is relatively low, vrAnd vr0Difference also very little, it is false
If when line voltage is in t=t0When symmetrically dropping into zero, the stator voltage vector of double-fed generator is,
According to formula (1) and (2), the differential equation of first order of double-fed generator stator magnetic linkage is obtained,
Solve above-mentioned differential equation of first order to obtain,
In formula (12), due to now vsFall to 0, ψsIt is unrelated with line voltage, and magnetic linkage can not be mutated, this flip-flop component magnetic
Chain part is only relevant with the transient process fallen, or claims free component ψsn, τs=Ls/RsRepresent that the doubly-fed generation machine stator time is normal
Number；
Step 2, design four bridge legs topological structure, specifically include following sub-step：
(a), in conventional tri- bridge arm topological structures of double PWM, respectively increase in original pusher side current transformer and net side current transformer
One bridge arm, constitutes four bridge legs topological structure, and the redundancy bridge arm of increase is T1 ' T2 ' and T7 ' T8 '；
B (), in pusher side current transformer and net side current transformer, each one redundancy bridge arm selector of increase is redundancy bridge arm selector 1
With redundancy bridge arm selector 2, for realizing the selection of four bridge legs；
(c), in real work, after finding that one of bridge arm is damaged, can be switched to above redundancy bridge arm and continue work
Make, while providing alarm status, remind owner to be overhauled, and then reached the purpose generated electricity with calm maintenance in strong wind；
(d), using Crowbar technologies as double-fed generator rotor short-circuit resist technology an effective way, can become
There is the effective protection that current transformer is realized under overcurrent and over-voltage condition in stream device, occurs by increasing the moment in low voltage crossing
Double-fed generator rotor resistance, that is, short circuit Crowbar resistance is reducing double-fed generator rotor short-circuit overcurrent, once
Crowbar resistance is shorted rear double-fed generator and is then changed into a common asynchronous machine, with the increase of Crowbar resistance,
Its power factor is improved, therefore on the premise of input mechanical output is certain, can be effectively reduced double-fed generator and be turned
Sub- amplitude of short circuit；
Step 3, design program flow chart, specifically include following sub-step：
(a), need according to the hardware fault of operation current transformer judging the bridge arm that is out of order, then cut by redundancy bridge arm selector
Except failure bridge arm, the bridge arm of normal operation input；
The state confirmation low voltage crossing state of (b), needs according to line voltage, if low voltage crossing state, then enter
Low voltage crossing is controlled, if it is not, then low piercing into capable process according to non-；
(c), need according to overcurrent and the situation of overvoltage, and the situation of grid voltage sags, confirm Crowbar actions rule
Then.
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| CN114256871A (en) * | 2021-11-29 | 2022-03-29 | 国网河南省电力公司电力科学研究院 | Control method and system for improving low voltage ride through capability of doubly-fed wind turbine generator |
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