CN104466968B - A kind of DSTATCOM negative-sequence currents cross coupling compensation control method - Google Patents
A kind of DSTATCOM negative-sequence currents cross coupling compensation control method Download PDFInfo
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- CN104466968B CN104466968B CN201410820196.9A CN201410820196A CN104466968B CN 104466968 B CN104466968 B CN 104466968B CN 201410820196 A CN201410820196 A CN 201410820196A CN 104466968 B CN104466968 B CN 104466968B
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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
- H02J3/01—Arrangements for reducing harmonics or ripples
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/10—Flexible AC transmission systems [FACTS]
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The invention discloses a kind of DSTATCOM negative-sequence currents cross coupling compensation control method, adopts a kind of digital phase-locking method for two-dimensional quadrature base based on sine and cosine trigonometric function, it is to avoid conventional dq converts the complexity of software phlase locking closed loop control.And overcome the complexity of current negative-sequence current compensation control Coordinate Conversion control, propose a kind of cross-couplings negative-sequence current control strategy, the output valve that negative-sequence current carries out closed loop controller is carried out being cross-coupled to positive sequence active component in rotate counterclockwise dq coordinate system, or positive sequence harmonic electric current, in stream pressure transformation result, uniform spaces vector controlled is carried out.
Description
Technical field
A kind of a kind of the present invention relates to compensating control method of electric current, more particularly to DSTATCOM negative-sequence currents intersection
Compensating for coupling control method.
Background technology
In recent years, developing rapidly due to Power Electronic Technique, various electronic power conversion devices are in power system, work
Application in industry, traffic and family is increasingly extensive, there is substantial amounts of imbalance, nonlinear-load, impact, ripple in power system
The mash welder of the phase line power voltage supply in the industries such as dynamic property load and some single-phase Large Copacity loads, such as automobile making,
Industrial ac arc furnace, electric railway etc..The negative phase-sequence of these loads generations, idle harmonic electric current cause a large amount of electric energy
Loss, and be on the rise, threaten safety and the economical operation of power system.In user side power quality controlling, idle negative
Sequence current compensation is always the study hotspot of electrical engineering field, and compared with traditional SVC, TSC compensation, DSTATCOM power distribution networks are same
Step static passive compensation device have the compensation time fast, can Continuous Compensation, do not produce resonance, to can compensate for certain subharmonic etc. excellent
Point.Therefore low pressure DSTATCOM is a kind of more excellent approach for solving the problems, such as above-mentioned custom power quality.
For the compensation of negative-sequence current, angle-style Scheme of Reactive Power Compensation is currently mainly adopted in the industry.Passive：According to
Steinmetz principles, carry out idle and negative phase-sequence comprehensive compensation using pure idle branch, with the corner connection of the switching based on IGCT
Type reactive power compensator (adopts phase splitting compensation method) in three-phase four-wire system connection, but which is based on phase control techniques, response speed
Slowly, harmonic current can be produced.Active type (SVG) corner connection scheme is a kind of good power quality controlling scheme, as shown in figure 1, by 3
Individual H bridge power units composition, by corner connection mode access system in, which has fast response time, can carry out idle, negative phase-sequence harmonic
Comprehensive control.In corner connection Scheme of Reactive Power Compensation, pass through line current phase frequently with the symmetrical component method based on Steinmetz principles
Amount calculates compensation susceptance, and the phasor relied on based on Periodic Mean is theoretical.The susceptance of phasor identification and complexity calculates and needs to spend
Plenty of time, larger time delay is caused, more than generally one grid cycle, real-time is poor.
For corner connection type SVG compensates negative-sequence current method, sequence decomposition is carried out typically by CT detections line current and (or passed through
Instantaneous reactive algorithm) calculate negative-sequence current and positive sequence active component, then by line phase coordinates become change commanders calculate negative phase-sequence,
Reactive current line value carries out Coordinate Conversion and compensates to the target compensation electric current for being mutually worth to corner connection type SVG.But this method
There are two kinds of deficiencies, one is that compensation device itself is made up of three single-phase H bridges, and the pressure voltage of power cell mutually increases, while work(
Rate unit topological structure is complicated；Two when being that target current is transformed into mutually value by line value, as line phase coefficient matrix is not full rank, because
And known line current asks phase current to there is solve more, it is necessary to which increasing constraints can just obtain unique solution, computing is which increased complicated
Degree and operand.
For the compensation of negative-sequence current, current Main is that target negative-sequence current is carried out in ABC time domains stagnant ring is straight
Connect current control or stream pressure is carried out by closed loop control in dq coordinate systems and be converted to target voltage, reconvert is to α β coordinate systems
In carry out SVPWM controls.Positive-negative sequence target current is all respectively controlled the substantial amounts of Coordinate Conversion of needs by these control methods
Calculate.
Content of the invention
It is an object of the invention to overcoming the deficiencies in the prior art, there is provided a kind of DSTATCOM negative-sequence currents cross-couplings
Compensating control method.
The present invention is achieved by the following technical solutions：A kind of DSTATCOM negative-sequence currents cross coupling compensation controlling party
Method, comprises the steps：
Step one, the standard sin cos functionses that construction initial phase is 0 obtain trigonometric function two-dimensional quadrature base, real-time sampling
Grid line voltage instantaneous value, is integrated after carrying out product with the orthogonal basiss sine and cosine value of construction again, obtains grid line voltage base
Ripple positive-sequence component phase place enters horizontal lock, obtains grid line voltage phase place, can obtain corresponding line voltage U according to this phase placeABPhase place is just
Cosine value and two frequency multiplication sine and cosine values, while be calculated corresponding phase voltage UAPhase place sine and cosine value and two frequency multiplication sine and cosine values；
Step 2, according to step one lock phase result grid line voltage is carried out dq conversion counterclockwise and dq clockwise conversion,
Transformation result is filtered through wave trap respectively；
Step 3, carry out decoupling the positive sequence for obtaining three phase network line voltage by the result of step 2 and negative sequence component is corresponding
Dq sits target value；
Step 4, the instantaneous value of real-time sampling load current, are carried out to load current value according to step one lock phase result inverse
Hour hands dq conversion and clockwise dq conversion, transformation result is filtered through wave trap respectively；
Step 5, the result of step 4 is carried out corresponding with the negative sequence component dq of positive sequence that positive-negative sequence decoupling obtains load current
Sit target value；
Step 6, the instantaneous value of real-time sampling DSTATCOM output currents, lock phase result to output current according to step one
Value carries out dq conversion counterclockwise and dq clockwise conversion, and transformation result is filtered through wave trap respectively；
Step 7, the result of step 6 is carried out positive sequence and negative phase-sequence point that positive-negative sequence decoupling obtains DSTATCOM output currents
The corresponding dq of amount sits target value；
Step 8, according to device control require, using DC voltage closed loop control, its output valve be d axle target currents,
Q axle results according to step 5 obtain the positive sequence reactive-load compensation target current of DSTATCOM devices, while obtaining DSTATCOM dresses
The negative sequence compensation target current that puts；
The positive and negative order components of grid line voltage are converted into the positive-negative sequence of phase voltage by step 9, the result according to step 3
Component, according to the result of step 8, carries out the feedforward solution of target current respectively on the d axles under dq coordinate systems counterclockwise and q axles
Coupling is controlled, and carries out PI closed loop controls；
Step 10, the result according to step 8, carry out target electricity on the d axles under dq coordinate systems clockwise and q axles respectively
The feed forward decoupling control of stream, and PI closed loop controls are carried out, the result of Feedforward Decoupling, closed loop control is carried out cross-couplings then
To in dq coordinates counterclockwise, the cross-coupling control of negative-sequence current is realized, its essence is by negative sequence component closed loop control result coupling
Close positive-sequence component to be uniformly controlled；
Step 11, the result of step 10 is carried out inverse PARK to transform to realize in α, β coordinate system stream pressure conversion, carry out
SVPWM is controlled, and realizes that target is idle and negative-sequence current is compensated.
The present invention has advantages below compared to existing technology：The invention provides a kind of DSTATCOM negative-sequence currents intersect coupling
Compensating control method is closed, the method provides a kind of easy reliable digital phase-locking method being easily achieved, it is to avoid conventional dq conversion is soft
The inexactness of the complexity and result of the control of part phase-locked closed-loop.Adopt based on sine and cosine trigonometric function as the one of two-dimensional quadrature base
Plant digital phase-locking method.And overcome the complexity of current negative-sequence current compensation control Coordinate Conversion control, it is proposed that a kind of intersection
Coupling negative-sequence current control strategy, the output valve that negative-sequence current carries out closed loop controller is entered in rotate counterclockwise dq coordinate system
Row is cross-coupled to positive sequence active component, or positive sequence harmonic electric current, in stream pressure transformation result, carries out uniform spaces vector control
System.
Description of the drawings
Fig. 1 is corner connection DSTATCOM topological system structural representations.
Fig. 2 is that the three phase full bridge star of the present invention connects DSTATCOM topological system structural representations.
Fig. 3 is that the three phase full bridge star of the present invention connects DSTATCOM mathematical model schematic diagrams.
Fig. 4 is CLARK, PARK coordinate transforming axle schematic diagram of the application of the present invention.
Fig. 5 be the present invention use based on sine and cosine orthogonal two-dimensional base lock facies principle figure.
Fig. 6 is that this positive and negative order components of bright line voltage decouples point sequence schematic diagram.
Fig. 7 is that the positive and negative order components of load current of the invention decouple point sequence schematic diagram.
Fig. 8 is that the positive and negative order components of DSTATCOM device output currents of the invention decouple point sequence schematic diagram.
Fig. 9 is the cross-coupling control compensation principle of idle and negative sequence component double-closed-loop control and the negative sequence component of the present invention
Figure.
Specific embodiment
Below embodiments of the invention are elaborated, the present embodiment is carried out under premised on technical solution of the present invention
Implement, give detailed embodiment and specific operating process, but protection scope of the present invention is not limited to following enforcements
Example.
Referring to Fig. 2-3, it is that the three phase full bridge star of the present invention connects DSTATCOM topological systems structural representation and corresponding number
Model structure schematic diagram is learned, star DSTATCOM is connected in three-phase three-wire system power distribution network.Star DSTATCOM connects for three-phase star
Binding structure, chain H bridge composition of its topological structure for the three phase full bridge or mesohigh of low pressure, load current i1a,i1b,i1cComprising
Active, idle, negative phase-sequence harmonic electric current, wherein idle, negative phase-sequence and harmonic current injection electrical network, cause electrical network energy loss, prestige
Side of body system stable operation.Star DSTATCOM output currents ica、icb、icc, negative phase-sequence harmonic electric current width idle with load current
Value is identical, in opposite direction.Star DSTATCOM output currents be superimposed with the load current idle in the elimination current on line side,
Negative phase-sequence harmonic electric current, it is ensured that the electrical network quality of power supply.
A kind of DSTATCOM negative-sequence currents cross coupling compensation control method, comprises the steps：
Step one, the standard sin cos functionses that construction initial phase is 0 obtain trigonometric function two-dimensional quadrature base, real-time sampling
Grid line voltage instantaneous value, is integrated after carrying out product with the orthogonal basiss sine and cosine value of construction again, obtains grid line voltage base
Ripple positive-sequence component phase place enters horizontal lock, obtains grid line voltage phase place, can obtain corresponding line voltage U according to this phase placeABPhase place is just
Cosine value and two frequency multiplication sine and cosine values, while be calculated corresponding phase voltage UAPhase place sine and cosine value and two frequency multiplication sine and cosine values.
Referring to Fig. 5, it is the lock phase based on sin cos functionses two-dimensional quadrature base, constructs the sin cos functionses that initial phase is 0
Sinwt, coswt are two-dimensional quadrature base, if line voltage UABFundamental positive sequence phase place is wt+ θ+, its amplitude is Um, lock the mesh of phase
Be solve wt+ θ+；By the U for collectingABIt is multiplied with sinwt, coswt of construction respectively and makees cycle inner product and obtain：
Easily obtained by above formula
Line voltage fundamental positive sequence phase place can be obtained by trigonometric function operation according to formula (1), (2), (3)Fundamental wave negative sequence component phaseCorresponding phase voltage is obtained with line voltage phase relation according to phase voltage
UAFundamental wave positive-negative sequence phase place be respectivelyIn above-mentioned method for solving is made in discretization process
Product calculates the coefficient being considered as when seeking phase place caused by sample frequency.
Referring to CLARK, PARK coordinate transforming axle schematic diagram of the application that Fig. 4 is the present invention, each coordinate needed for the present invention
Transformation matrix is defined as follows：
CLARK3 is converted：
CLARK3 inverse transformations：
CLARK2 is converted：
PARK conversion counterclockwise：
PARK inverse transformations counterclockwise：
PARK conversion clockwise：
Step 2, according to step one lock phase result grid line voltage is carried out dq conversion counterclockwise and dq clockwise conversion,
Transformation result is filtered through wave trap respectively.
Step 3, carry out decoupling the positive sequence for obtaining three phase network line voltage by the result of step 2 and negative sequence component is corresponding
Dq sits target value.
Fig. 6 is line voltage U of samplingAB、UBCThe positive and negative order components theory diagram of equivalent phasevoltage is calculated, by UAB、UBCPass through
CLARK2 is transformed under α β coordinate systems, is entered line translation with line voltage by CLARK2 and is intended to the impact for reducing zero-sequence component.
Make PARK conversion counterclockwise：
WhereinFor fundamental positive sequence amplitude, θ+For fundamental positive sequence amount initial phase,For fundamental wave negative sequence component width
Value, θ-For fundamental wave negative sequence component initial phase, it is seen that after PARK counterclockwise conversion, gained dq axles component is respectively containing direct current point
Amount and two frequency multiplication AC compounents, its DC component are fundamental positive sequence corresponding conversion value, and two frequency multiplication AC compounents are that negative phase-sequence is divided
Amount coupling value, it is contemplated that system voltage generally aberration rate very little, is to calculate quick, does not consider harmonic wave point in transformation process
Amount, entirety do not affect testing result.Equally, DC component and the exchange point of two frequencys multiplication are there is also in PARK transformation results clockwise
Amount, the corresponding fundamental wave negative sequence component of its DC component, AC compounent is positive-sequence component coupling value；
Make PARK conversion clockwise：
Order
According to (5), (6) two formulas design line voltage positive-negative sequence Decoupling network, by PARK transformation results counterclockwise, clockwise
Two frequency multiplication AC compounents remove and realize that positive and negative order components are full decoupled in dq coordinate systems.Consideration accuracy of detection and in real time
Property, using secondary wave trap, the present invention realizes that two frequency multiplication AC compounents are filtered, and obtain DC component under the positive and negative dq coordinate systems of voltage
Final consideration DSTATCOM devices are modulation compensated using space S VPWM, thus by line voltage positive-negative sequence dq coordinate system
In component be converted to value of the equivalent phasevoltage in corresponding coordinate system
Step 4, the instantaneous value of real-time sampling load current, are carried out to load current value according to step one lock phase result inverse
Hour hands dq conversion and clockwise dq conversion, transformation result is filtered through wave trap respectively.
Step 5, the result of step 4 is carried out corresponding with the negative sequence component dq of positive sequence that positive-negative sequence decoupling obtains load current
Sit target value.
Step 6, the instantaneous value of real-time sampling DSTATCOM output currents, lock phase result to output current according to step one
Value carries out dq conversion counterclockwise and dq clockwise conversion, and transformation result is filtered through wave trap respectively.
Step 7, the result of step 6 is carried out positive sequence and negative phase-sequence point that positive-negative sequence decoupling obtains DSTATCOM output currents
The corresponding dq of amount sits target value.
Step 8, according to the control of DSTATCOM devices require, using DC voltage closed loop control, its output valve be d
Axle target current, the q axle results according to step 5 obtain the positive sequence reactive-load compensation target current of DSTATCOM devices, while obtaining
The negative sequence compensation target current of DSTATCOM devices.
Fig. 7 is that load current idle component and negative sequence component solution procedure, its solution procedure are asked with the positive and negative order components of voltage
Solution preocess is similar to, it is contemplated that in load current, harmonic content is big, is entered using second-order low-pass filter in the positive and negative order components of fundamental wave are solved
Row AC compounent is filtered.Finally giveWhereinFor fundamental positive sequence reactive current,For
Value of the fundamental wave negative sequence component in up time dq coordinate system.Harmonic component can also be asked for by this method.
Fig. 8 is the positive and negative order components solution procedure of DSTATCOM output currents, its solution procedure and load current positive-negative sequence point
Amount solution procedure is similar to, and finally givesWhereinFor fundamental positive sequence active current, device is from net
Side is drawn real component and maintains dc-voltage balance,Fundamental positive sequence reactive current is loaded for device compensation,For
Value of the device fundamental wave negative sequence component in up time dq coordinate system, in order to compensate load current negative sequence component.Press this control principle
Harmonic compensation can be carried out.
The positive and negative order components of grid line voltage are converted into the positive-negative sequence of phase voltage by step 9, the result according to step 3
Component, according to the result of step 8, carries out the feedforward solution of target current respectively on the d axles under dq coordinate systems counterclockwise and q axles
Coupling is controlled, and carries out PI closed loop controls.
Step 10, the result according to step 8, carry out target electricity on the d axles under dq coordinate systems clockwise and q axles respectively
The feed forward decoupling control of stream, and PI closed loop controls are carried out, the result of Feedforward Decoupling, closed loop control is carried out cross-couplings then
To in dq coordinates counterclockwise, the cross-coupling control of negative-sequence current is realized, its essence is by negative sequence component closed loop control result coupling
Close positive-sequence component to be uniformly controlled.
Step 11, the result of step 10 is carried out inverse PARK to transform to realize in α, β coordinate system stream pressure conversion, carry out
SVPWM is controlled, and realizes that target is idle and negative-sequence current is compensated.
Fig. 9 is that reactive current Feedforward Decoupling double-closed-loop control compensation process and negative-sequence current Feedforward Decoupling double-closed-loop control are handed over
Fork coupling control process.There are a Voltage loop and four electric current loops in figure respectively, in Voltage loopFor the given letter of DC voltage
Number, UdcFor DC voltage measured signal, the two is through PI controls, given letter of its controlled output result as positive sequence watt current ring
Number, with device output currentComponent composition positive sequence watt current ring control, it is therefore intended that device absorbs active electricity from net side
Stream, has to maintain DC voltage stability；Equally, positive sequence idle component is loadedControl as positive sequence active component ring after negating
Target, exports positive sequence idle component with deviceComposition positive sequence active component control ring, in order to compensate the idle electricity of load positive sequence
Stream；Negative-sequence current component is controlled using same current ring with forward-order current；In order to realize that positive-negative sequence is active complete with idle component
Full decoupling, present invention employs feed forward decoupling control；Meanwhile, in order to suppress grid disturbances, voltage feed-forward control in control
Control.
The purpose for carrying out Voltage loop and current loop control is that realizing that stream is pressed changes, and obtains device bridge arm side output mesh
Mark voltage, realizes stream pressure conversion.
Device negative-sequence current closed loop obtains value under bridge arm side negative phase-sequence target voltage dq coordinate systems clockwise, and the present invention is using negative
The method negative phase-sequence target voltage of sequence current cross coupling control is coupled to positive sequence dq counterclockwise by cross-couplings transformation matrix to be sat
Carry out being uniformly controlled space vector SVPWM controls in mark system, cross-coupling matrices are：
Negative phase-sequence target voltage through be cross-coupled in dq coordinate systems counterclockwise superimposed with positive sequence target voltage obtain total
Dq coordinate system target voltagesWhich is obtained through PARK inverse transformations counterclockwise：
WithCarry out positive sequence active component and negative sequence component compensation that SVPWM compensation finally achieves device.
Presently preferred embodiments of the present invention is the foregoing is only, not in order to limit the present invention, all in essence of the invention
Any modification, equivalent and improvement that is made within god and principle etc., should be included within the scope of the present invention.
Claims (2)
1. a kind of DSTATCOM negative-sequence currents cross coupling compensation control method, it is characterised in that comprise the steps：
Step one, the standard sin cos functionses that construction initial phase is 0 obtain trigonometric function two-dimensional quadrature base, real-time sampling electrical network
Line voltage instantaneous value, is integrated after carrying out product with the orthogonal basiss sine and cosine value of construction again, is just obtaining grid line voltage fundamental wave
Order components phase place enters horizontal lock, obtains grid line voltage phase place, can obtain corresponding line voltage U according to this phase placeABPhase place sine and cosine
Value and two frequency multiplication sine and cosine values, while be calculated corresponding phase voltage UAPhase place sine and cosine value and two frequency multiplication sine and cosine values；
Step 2, according to step one lock phase result grid line voltage is carried out dq conversion counterclockwise and dq clockwise conversion, will turn
Change result to filter through wave trap respectively；
Step 3, the result of step 2 carries out decoupling the positive sequence for obtaining three phase network line voltage and the corresponding dq of negative sequence component sits
Target value；
Step 4, the instantaneous value of real-time sampling load current, are carried out to load current value according to the lock phase result that step one is obtained
Dq conversion and clockwise dq conversion counterclockwise, transformation result is filtered through wave trap respectively；
Step 5, the result of step 4 is carried out corresponding with the negative sequence component dq coordinates of positive sequence that positive-negative sequence decoupling obtains load current
Value；
Step 6, the instantaneous value of real-time sampling DSTATCOM output currents, electric to output according to the lock phase result that step one is obtained
Flow valuve carries out dq conversion counterclockwise and dq clockwise conversion, and transformation result is filtered through wave trap respectively；
Step 7, the result of step 6 is carried out positive-negative sequence decoupling obtain positive sequence and the negative sequence component pair of DSTATCOM output currents
Dq is answered to sit target value；
Step 8, according to the control of DSTATCOM devices require, using DC voltage closed loop control, its output valve be d axle mesh
Mark electric current, the q axle results according to step 5 obtain the positive sequence reactive-load compensation target current of DSTATCOM devices, while obtaining
The negative sequence compensation target current of DSTATCOM devices；
Step 9, the result according to step 3, the positive and negative order components that the positive and negative order components of grid line voltage are converted into phase voltage,
According to the result of step 8, the Feedforward Decoupling control of target current on the d axles under dq coordinate systems counterclockwise and q axles, is carried out respectively
System, and carry out PI closed loop controls；
Step 10, the result according to step 8, carry out target current on the d axles under dq coordinate systems clockwise and q axles respectively
Then the result of Feedforward Decoupling, closed loop control is carried out being cross-coupled to inverse by feed forward decoupling control, and carry out PI closed loop controls
In hour hands dq coordinates, the cross-coupling control of negative-sequence current is realized, its essence is to be coupled to negative sequence component closed loop control result
Positive-sequence component is uniformly controlled；
Step 11, the result of step 10 is carried out inverse PARK to transform to realize in α β coordinate systems stream pressure conversion, carry out SVPWM controls
System, realizes that target is idle and negative-sequence current is compensated.
2. a kind of DSTATCOM negative-sequence currents cross coupling compensation control method according to claim 1, it is characterised in that：
Line voltage fundamental positive sequence phase place is obtained according to step oneFundamental wave negative sequence component phaseRoot
Corresponding phase voltage U is obtained according to phase voltage with line voltage phase relationAFundamental wave positive-negative sequence phase place be respectivelyWherein, θ+For fundamental positive sequence amount initial phase.
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| CN104734164B (en) * | 2015-03-31 | 2017-01-18 | 中国矿业大学 | Control method for low-voltage static var generator based on voltage space vector |
| CN105529710A (en) * | 2015-12-01 | 2016-04-27 | 贵州大学 | Control method and device based on distribution static synchronous compensator (DSTATCOM) topological structure |
| CN109830966B (en) * | 2017-11-23 | 2023-06-06 | 天津平高智能电气有限公司 | Three-phase four-wire system electric energy quality comprehensive treatment device and control method and system thereof |
| CN108306316B (en) * | 2018-02-10 | 2020-03-10 | 国家电网公司 | Positive and negative sequence coordination control system and method for chain type STATCOM in power grid voltage unbalance |
| CN110198040A (en) * | 2019-05-20 | 2019-09-03 | 清华大学 | Flywheel energy storage system low voltage traversing control method and device based on VSG |
| CN110308326A (en) * | 2019-07-15 | 2019-10-08 | 国网山西省电力公司电力科学研究院 | A method of open loop can be improved and surveys phase algorithm noiseproof feature |
| CN110829808A (en) * | 2019-11-01 | 2020-02-21 | 中车永济电机有限公司 | Current low-order harmonic suppression method for four-quadrant converter of electric locomotive |
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| CN102291023B (en) * | 2011-08-22 | 2013-08-21 | 哈尔滨工业大学 | Positive-negative sequence voltage feedforward method of three-phase PWM (pulse width modulation) converter |
| CN102412579B (en) * | 2011-09-26 | 2014-03-12 | 中国电力科学研究院 | Harmonic current compensating method based on fast Fourier transform |
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