CN108092303A - A kind of fault tolerant control method and system of wind generator system back-to-back converter - Google Patents
A kind of fault tolerant control method and system of wind generator system back-to-back converter Download PDFInfo
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- CN108092303A CN108092303A CN201711265492.7A CN201711265492A CN108092303A CN 108092303 A CN108092303 A CN 108092303A CN 201711265492 A CN201711265492 A CN 201711265492A CN 108092303 A CN108092303 A CN 108092303A
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Classifications
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- H02J3/386—
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/325—Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters
-
- 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 discloses a kind of fault tolerant control methods and system of wind generator system back-to-back converter, this method is after the bridge arm to break down in determining six bridge arms of back-to-back converter, remaining five healthy bridge arms are reconstructed into five bridge arm current transformers, cause barrier bridge arm is corresponded to be connected using bidirectional thyristor and is connected to healthy bridge arm, which is defined as public bridge arm；In order to avoid public bridge arm overcurrent under faults-tolerant control, the electric current of public bridge arm is detected, if public bridge arm current is more than electric current early warning value, regulator generator rotating speed, so as to control the phase difference of generator side phase corresponding with net side on public bridge arm 120。—240。It is interior, realize the normal operation of wind power-generating grid-connected system.Fault tolerant control method of the present invention can realize uninterrupted fault-tolerant operation of the system under current transformer failure, while can keep public bridge arm not overcurrent, have good robustness.
Description
Technical field
The invention belongs to field of new energy generation, the fault-tolerant control being related under a kind of wind generator system current transformer malfunction
Method and system processed.
Background technology
Since 19 century 70s, the country using coal, oil as main fuel has faced serious environmental pollution, in addition
Fossil fuel is limited, the Double jeopardy of reserves reduction is increasingly deepened, and it is sustainable that utilization new energy has become world energy sources
The important component of development strategy, and wind energy is most a kind of energy of potentiality to be exploited in new energy.Constantly lasting
Under energy shortage situation, especially developed countries of many countries in the world, all find a kind of alternative conventional energy resource, to environment
Free of contamination sustainable development new energy.Large-scale developing and utilizing for the new energy such as solar energy, nuclear energy, tide energy, wind energy will have
Pressure caused by the alleviation energy supply anxiety of effect.According to incompletely statistics, world's wind energy resources is up to annual 53000000000000 kilowatts
When, the installed capacity in the world is all increased every year with 25% speed, it is contemplated that in following 10 years, world wind energy market every year will
It is incremented by 20% or so.THE WIND ENERGY RESOURCES IN CHINA is widely distributed, in hinterland such as Inner Mongol the north, Gansu, Xinjiang and southeastern coast,
Shandong, Liaoning peninsula etc. belong to wind-resources and enrich area.The developable wind energy resources in China land has reached 2.53 hundred million kilowatts
When, in addition the developable wind energy resources estimation in coastal waters, more than 1,000,000,000 kilowatt hours, 2 times more than hydraulic power potentials are had a surplus, Er Qiewo
State's Industrialized conditions first-elected wind-power electricity generation the most ripe.Therefore, it is necessary to it pays close attention and incites somebody to action to the exploitation of wind-power electricity generation
It is included in the row of energy preferential development plan, this will play adjustment China's energy resource structure, alleviation environmental pollution etc. can not
The effect of appraisal, and the importance of wind-power electricity generation has obtained many countries fully accreditation in the world.
Since wind generator system is the nonlinear system of high-order, multivariable, parameter time varying, and it is chronically at along plateau
Etc. in working environment complicated and changeable, high-power, high load capacity is continuously run, and current transformer is the link for being very easy to break down,
The failure of current transformer can cause production process to be paused, in some instances it may even be possible to cause serious disaster.In order to avoid due to current transformer failure and
Cause whole system unstable, faults-tolerant control is introduced to current transformer, makes current transformer can be normal in the case where there are some fault conditions
Operation adds the stability of system to a certain extent.
The content of the invention
Goal of the invention：For overcome the deficiencies in the prior art, the present invention provides a kind of wind generator systems to become back-to-back
The fault tolerant control method and system of device are flowed, the five bridge arm unsteady flows of healthy bridge arm composition of residue five of current transformer after failure can be utilized
Device realizes the uninterrupted fault-tolerant operation under back-to-back converter failure, improves system robustness.
Technical solution：For achieving the above object, the present invention adopts the following technical scheme that：
A kind of fault tolerant control method of wind generator system back-to-back converter, the back-to-back converter are six bridge arms two
Level block, three bridge arms of current transformer connect wind-power electricity generation pusher side three-phase windings respectively, and the other three bridge arm connects power grid respectively
Side three-phase windings are connected with three groups of bidirectional thyristors between generator side winding and grid side winding, and one group is only connected per phase
Bidirectional thyristor；The fault tolerant control method includes：
Three groups of bidirectional thyristors are in off state during system normal operation, and normal shape is obtained using SVPWM modulation methods
The switching signal control system operation of lower six bridge arms of state；
When any bridge arm breaks down in six bridge arms, failure bridge arm is cut off, failure bridge arm is connected and corresponds to the two-way of phase
Cause barrier bridge arm is corresponded to be connected by thyristor is connected to healthy bridge arm, forms five bridge arm current transformers, which is defined as public affairs
Bridge arm altogether；The electric current of public bridge arm is detected, if public bridge arm current is more than rated current, regulator generator rotating speed, by public bridge
The phase-difference control of generator side phase corresponding with grid side realizes current transformer under non-over-current state in 120 ° -240 ° on arm
Fault-tolerant operation.
Preferably, after failure reconfiguration, if public bridge arm current is less than rated current, generator side uses vector control
System, rotating speed are determined that grid side uses direct Power Control by optimum tip-speed ratio；After obtaining given voltage signal, according to five bridges
Six phase PWM modulation method of arm carries out residual voltage compensation to six phase given voltage signals so that the corresponding two-phase compensation of public bridge arm
Voltage afterwards is equal, so as to obtain the switching signal of five bridge arms.
Preferably, after failure reconfiguration, if public bridge arm current is more than rated current, regulator generator side rotating speed, control
It makes two-phase phase difference on public bridge arm and in 120 ° -240 °, afterwards by five bridge arms, six phase PWM modulation method, electricity is given to six phases
Signal is pressed to carry out residual voltage compensation so that the voltage after the corresponding two-phase compensation of public bridge arm is equal, so as to obtain five bridges
The switching signal of arm.
Preferably, using the modulator approach based on triangular carrier, given voltage signal after compensating residual voltage into
Row modulation obtains the switching signal of system, realizes the fault-tolerant operation of system.
Using the wind generator system of the fault tolerant control method of above-mentioned back-to-back converter, including wind-driven generator, described
Back-to-back converter, dc bus Support Capacitor group and three groups of bidirectional thyristors, the three-phase windings of the wind-driven generator
Three bridge arms of back-to-back converter are respectively connected to, the other three bridge arm of current transformer is connected to power grid；The dc bus branch
Support capacitance group is connected in parallel on dc bus, three groups of bidirectional thyristors connection grid side and motor side winding, grid side and electricity
Pusher side only connects one group of bidirectional thyristor per phase.
Advantageous effect：The method of the present invention is in the wind generator system of widely used back-to-back converter, it is proposed that one
The fault tolerant control method of kind of current transformer, this method except algorithm is simple, be easily achieved the advantages of in addition to, it is excellent to further include following technology
Gesture：
Advantage I-and when the single bridge arm of wind generator system back-to-back converter breaks down, it need not be by entire unsteady flow
Device is cut off, and fault-tolerant operation is realized using remaining five non-faulting bridge arms；
Advantage II-and while fault-tolerant operation under realizing wind generator system back-to-back converter fault condition, Neng Gouwei
All bridge arms of current transformer not overcurrent is held, so as to improve the stability of whole system.
Advantage III-three groups of bidirectional thyristors are only added in existing equipment, and can be moved immediately when failure occurs
Make, realize fault-tolerant operation, reduce equipment investment.
Description of the drawings
Fig. 1 is the FB(flow block) of the method for the present invention；
Fig. 2 is hardware experiment structure diagram, wherein (a) is under normal operating condition, K1, K2, K3 turns off, (b)
Under 6 malfunction of bridge arm, K1, K2 shut-off, K3 conductings.
Specific embodiment
The present invention will be described below with reference to accompanying drawings.
The system hardware structure of the embodiment of the present invention is as shown in Fig. 2, wind generator system includes：One wind-power electricity generation
Machine, a back-to-back converter, dc bus Support Capacitor group and three groups of bidirectional thyristors；Wherein wind-driven generator is common three
Phase motor, back-to-back converter are six bridge arms, two level block, and the three-phase windings of wind-driven generator are respectively connected to current transformer
Three bridge arms, the other three bridge arm of current transformer are connected to power grid；Dc bus supports that capacitance group is multiple capacitance series and parallel structures,
Meets the needs of DC bus-bar voltage and output power；Three groups of bidirectional thyristor connection grid sides and motor side winding, simultaneously
Ensure that grid side is only connected one group of bidirectional thyristor with motor side per phase.
A kind of fault tolerant control method of wind generator system back-to-back converter disclosed by the embodiments of the present invention, in system just
Often three groups of bidirectional thyristors are in off state during operation, and lower six bridge arms of normal condition are obtained using SVPWM modulation methods
Switching signal control system is run；When any bridge arm breaks down in six bridge arms, failure bridge arm is cut off, connects failure bridge arm
Cause barrier bridge arm is corresponded to be connected by the bidirectional thyristor of corresponding phase is connected to healthy bridge arm, five bridge arm current transformers is formed, by the health
Bridge arm is defined as public bridge arm；The electric current of public bridge arm is detected, if public bridge arm current is more than rated current, regulator generator turns
Speed by the phase-difference control of the phase corresponding with grid side of generator side on public bridge arm in 120 ° -240 °, realizes current transformer non-
Fault-tolerant operation under over-current state.Specific implementation step as shown in Figure 1, including：
(1) during system normal operation, three groups of bidirectional thyristors are in off state；
(2) generator side uses vector controlled, while determines rotating speed by optimum tip-speed ratio maximal wind-power tracking method, obtains
Obtain maximum power coefficient.Grid side use direct Power Control, realize active power, reactive power decoupling control with
And power factor is arbitrarily adjustable, and given voltage signal is obtained according to above-mentioned control strategy
Wherein,For motor side given voltage,For grid side given voltage；
(3) whether detection current transformer breaks down, if not breaking down, enters step (2), is obtained using SVPWM modulation methods
The switching signal of lower six bridge arms of normal condition is obtained, so as to control the operation of whole system；If breaking down, step (4) is performed；
(4) generation event in six bridge arms of current transformer is determined according to based on traditional fault detection method (such as wavelet analysis method)
Cause barrier bridge arm correspondence using bidirectional thyristor is connected and is connected to healthy bridge arm, and the bridge arm is defined as by the bridge arm sequence number of barrier
Public bridge arm, so as to which remaining five healthy bridge arms are reconstructed into five bridge arm current transformers, so the public bridge arm connects hair simultaneously
The a certain phase of motor side and grid side, and remaining bridge arm only connects a phase；
(5) the current value i of public bridge arm is detectedcom, work as icomLess than current transformer rated current ithdWhen, it is identical with step (2)
Control method, generator side uses vector controlled, and rotating speed determines by optimum tip-speed ratio, and grid side uses Direct Power control
System.Obtain given voltage signalWork as icomMore than current transformer rated current ithdWhen,
It enters step (6)；
(6) generator side uses vector controlled, and given rotating speed is determined by generator side and grid side phase angle difference, according to not phase
Adjacent selection principle, regulator generator side rotating speed, control on public bridge arm generator side phase angle and grid side phase angle for 120 °≤|
θx1-θx2|≤240 ° (x1, x2 correspond to phase, wherein x ∈ { A, B, C } for failure bridge arm), so that it is guaranteed that the public bridge arm not overcurrent；
Grid side uses direct Power Control.Given voltage signal can so be obtained
(7) according to five bridge arms, six phase PWM method, residual voltage compensation is carried out to six phase given voltage signals so that
Voltage after the corresponding two-phase compensation of public bridge arm is equal.Using the modulator approach based on triangular carrier, residual voltage is compensated
Given voltage signal afterwards is modulated, by failure bridge arm for exemplified by bridge arm 6：
Generator side residual voltage compensation after given voltage be：
Grid side residual voltage compensation after given voltage be
Wherein,Given voltage after being compensated for residual voltage,For the given voltage before compensation,For the residual voltage of generator side,For electricity
The residual voltage of net side.
Meet simultaneously：
Wherein, u3For the modulating wave of bridge arm 3.So according to the given voltage of five be calculated healthy bridge arms, utilize
Carried-based PWM method can output system switching signal, realize the fault-tolerant operation of system.
The foregoing is merely the present invention better embodiment, protection scope of the present invention not using the above embodiment as
Limit, as long as those of ordinary skill in the art's equivalent modification that disclosure is made according to the present invention or variation, should all include power
In protection domain described in sharp claim.
Claims (5)
- A kind of 1. fault tolerant control method of wind generator system back-to-back converter, which is characterized in that the back-to-back converter For six bridge arms, two level block, three bridge arms of current transformer connect wind-power electricity generation pusher side three-phase windings, the other three bridge arm point respectively Not Lian Jie grid side three-phase windings, three groups of bidirectional thyristors are connected between generator side winding and grid side winding, per phase Only connect one group of bidirectional thyristor；The fault tolerant control method includes：Three groups of bidirectional thyristors are in off state during system normal operation, are obtained using SVPWM modulation methods under normal condition The switching signal control system operation of six bridge arms；When any bridge arm breaks down in six bridge arms, failure bridge arm is cut off, connects the two-way brilliant lock that failure bridge arm corresponds to phase Cause barrier bridge arm is corresponded to be connected by pipe is connected to healthy bridge arm, forms five bridge arm current transformers, which is defined as public bridge Arm；The electric current of public bridge arm is detected, if public bridge arm current is more than rated current, regulator generator rotating speed will be on public bridge arm The phase-difference control of generator side phase corresponding with grid side realizes that current transformer is fault-tolerant under non-over-current state in 120-240 degree Operation.
- 2. a kind of fault tolerant control method of wind generator system back-to-back converter according to claim 1, feature exist In after failure reconfiguration, if public bridge arm current is less than rated current, generator side uses vector controlled, and rotating speed is by optimal leaf Tip-speed ratio determines that grid side uses direct Power Control；After obtaining given voltage signal, according to five bridge arms, six phase PWM modulation method, Residual voltage compensation is carried out to six phase given voltage signals so that the voltage after the corresponding two-phase compensation of public bridge arm is equal, from And obtain the switching signal of five bridge arms.
- 3. a kind of fault tolerant control method of wind generator system back-to-back converter according to claim 1, feature exist In after failure reconfiguration, if public bridge arm current is more than rated current, regulator generator side rotating speed is controlled two on public bridge arm Phase phase difference, afterwards by five bridge arms, six phase PWM modulation method, zero sequence is carried out to six phase given voltage signals in 120-240 degree Voltage compensation so that the voltage after the corresponding two-phase compensation of public bridge arm is equal, so as to obtain the switching signal of five bridge arms.
- 4. a kind of fault tolerant control method of wind generator system back-to-back converter according to Claims 2 or 3, feature It is, using the modulator approach based on triangular carrier, the given voltage signal after compensating residual voltage, which is modulated, is The switching signal of system realizes the fault-tolerant operation of system.
- 5. use the wind-power electricity generation system of the fault tolerant control method according to claim 1-4 any one of them back-to-back converters System, which is characterized in that including wind-driven generator, the back-to-back converter, dc bus Support Capacitor group and it is described three groups it is double To thyristor, the three-phase windings of the wind-driven generator are respectively connected to three bridge arms of back-to-back converter, current transformer it is another Three bridge arms are connected to power grid；The dc bus Support Capacitor group is connected in parallel on dc bus, three groups of bidirectional thyristors Grid side and motor side winding are connected, grid side is only connected one group of bidirectional thyristor with motor side per phase.
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| CN201711265492.7A CN108092303B (en) | 2017-12-05 | 2017-12-05 | A kind of fault tolerant control method and system of wind generator system back-to-back converter |
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| CN201711265492.7A CN108092303B (en) | 2017-12-05 | 2017-12-05 | A kind of fault tolerant control method and system of wind generator system back-to-back converter |
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Cited By (4)
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| CN111224589A (en) * | 2020-02-19 | 2020-06-02 | 苏州乾能电气有限公司 | Common-mode voltage control method for double-fed motor converter system |
| CN112510979A (en) * | 2020-11-25 | 2021-03-16 | 上海电气风电集团股份有限公司 | Converter fault-tolerant control method and system and wind generating set |
| CN113193759A (en) * | 2021-04-16 | 2021-07-30 | 山东大学苏州研究院 | High-power four-quadrant converter fault-tolerant control method based on predictive control |
| CN114142717A (en) * | 2021-12-03 | 2022-03-04 | 哈电风能有限公司 | Wind turbine generator fault-tolerant operation control method and wind turbine generator |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111224589A (en) * | 2020-02-19 | 2020-06-02 | 苏州乾能电气有限公司 | Common-mode voltage control method for double-fed motor converter system |
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| CN112510979A (en) * | 2020-11-25 | 2021-03-16 | 上海电气风电集团股份有限公司 | Converter fault-tolerant control method and system and wind generating set |
| CN113193759A (en) * | 2021-04-16 | 2021-07-30 | 山东大学苏州研究院 | High-power four-quadrant converter fault-tolerant control method based on predictive control |
| CN114142717A (en) * | 2021-12-03 | 2022-03-04 | 哈电风能有限公司 | Wind turbine generator fault-tolerant operation control method and wind turbine generator |
| CN114142717B (en) * | 2021-12-03 | 2024-02-20 | 哈电风能有限公司 | Fault-tolerant operation control method for wind turbine generator and wind turbine generator |
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| CN108092303B (en) | 2019-10-11 |
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