CN107834557A - It is a kind of based on the SVG dynamic passive compensations of PI Feedforward Decouplings and the control method of harmonic wave control - Google Patents
It is a kind of based on the SVG dynamic passive compensations of PI Feedforward Decouplings and the control method of harmonic wave control Download PDFInfo
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- CN107834557A CN107834557A CN201710999447.8A CN201710999447A CN107834557A CN 107834557 A CN107834557 A CN 107834557A CN 201710999447 A CN201710999447 A CN 201710999447A CN 107834557 A CN107834557 A CN 107834557A
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
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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 based on the SVG dynamic passive compensations of PI Feedforward Decouplings and the control method of harmonic wave control, the difference of DC side reference voltage and capacitance voltage is input to DC side PI controllers first, then current transformer sampling three-phase load current is passed through, carry out adc/dq conversion, and it is sent into low pass filter LPF, the reference instruction electric current as PI feedforward decoupling controllers is adjusted to the LPF dq axis components exported, the reference instruction electric current is sent into PI feedforward decoupling controllers compared with the power network current under dq coordinate systems, by error signal；Then the output signal of PI feedforward decoupling controllers converts by dq/abc, inputs SVPWM drive modules, so as to produce switching signal control three-phase full-bridge inverter, it is produced thermal compensation signal and realizes that dynamic passive compensation harmonic is administered.The control method of the present invention only realizes preferable harmonic compensation effect, control method is simple and easy, and compensation effect is preferable compared to traditional control method without complicated controller with PI controller cans.
Description
Technical field
The invention belongs to field of power electronics, and in particular to a kind of SVG dynamic passive compensations based on PI Feedforward Decouplings with
The control method of harmonic wave control.
Background technology
With the extensive use of non-linear asymmetric load, the idle and harmonic pollution problems in power system are increasingly tight
Weight.Traditional reactive-load compensation harmonic suppressing method has been difficult to the needs for meeting modern power systems, static reacance generator
(SVG) extensive concern is received as new reactive-load compensation harmonic controlling device.
Traditional SVG research focus is consistently placed to loading the detection and control of idle harmonic electric current, and is proposed
Many idle and harmonic current detections and control method.But due to the good and bad meeting of idle harmonic electric current detecting method
The compensation effect of Active Power Filter-APF is significantly affected, and to realize that the control to loading idle harmonic electric current is also one big
Difficult point.For example although Hysteresis control realizes that simply dynamic response is good, it is the shortcomings that it is very serious that switching frequency is not fixed, when
Right some scholars propose the hysteresis control method thereof of fixed frequency, but the realistic problem being mostly difficult in the presence of control load；
Cascade ratio resonance controls for another example, and because non-linear asymmetric load is mostly Rectified DC load, harmonic current number is mainly
6k ± 1 time, therefore the compensation of idle harmonic is realized by cascading a large amount of resonant controllers, but control accuracy is higher needs level
The resonant controller of connection is just corresponding more, and the more requirements for digital processing unit of resonant controller cascaded are higher, realize
It is more difficult, furthermore the harmonic current of other numbers in practical application also be present, therefore cascade ratio resonant controller is also difficult to very
Good realizes idle harmonic current compensation, and other similar control methods also mostly have the problem of such.
Therefore how using simple control method realize preferable compensation effect just become the present invention focus.
The content of the invention
The problem of being existed based on prior art, the present invention are proposed a kind of SVG dynamic reactives based on PI Feedforward Decouplings and mended
The control method with harmonic wave control is repaid, this method need not detect idle harmonic electric current, directly to the power network electricity under dq coordinate systems
Stream is controlled, and realizes that simple, precision is high, cost is low.
For achieving the above object, specific implementation of the invention is as follows：
It is a kind of based on the SVG dynamic passive compensations of PI Feedforward Decouplings and the control method of harmonic wave control, comprise the following steps：
Step 1), by contrasting DC side reference voltageWith electric capacity virtual voltage Vdc, both differences are input to directly
Side PI controllers are flowed, make virtual voltage VdcReal-time tracking reference voltageThe output of DC side PI controllers and load current
D axles active component is added；
Step 2), threephase load current signal that current transformer collects, three phase network current signal pass through respectively
Abc/dq is converted, and obtains the current component i under dq synchronous rotating framesLd、iLqAnd iSd、iSq；iLd、iLqBy low pass filter
LPF obtains d, q axle fundametal compoment of load currentWhereinWith the output phase of DC side PI controllers in step 1)
D axle fundametal compoments after adding as adjustmentZero is arranged to, as the q axle fundametal compoments after adjustment；WithAs PI
The reference instruction electric current of feedforward decoupling controller,WithBelieve compared with the three phase network electric current under dq coordinate systems, and by error
Number it is input to PI feedforward decoupling controllers；
Step 3), PI feedforward decoupling controllers realize that the decoupling of d, q shaft current and zero stable state to d, q shaft current are missed
Difference tracking, the output signal of PI feedforward decoupling controllers are input to SVPWM drive modules by dq/abc conversion；
Step 4), SVPWM drive modules produce the drive signal of three-phase full-bridge inverter, and three-phase full-bridge inverter is driving
The filtered inductance of thermal compensation signal is produced in the presence of signal to be connected to the grid, and realizes the compensation of harmonic and reactive currents.
Further, PI feedforward decoupling controllers include d shaft current controller PI1 and q shaft current controls in the step 3)
Device PI2, PI1 and PI2 processed transmission function isWherein KpFor proportionality coefficient, KiFor integral coefficient.
Further, transmission function is in assigned frequency ωnThe gain at place isWherein ωnFor angular frequency.
Further, the decoupling factor of PI feedforward decoupling controllers is ω L in the step 3), and wherein ω is dq coordinate systems
Synchronous rotary angular speed, L are the filter inductance of three-phase full-bridge inverter.
Further, the PI feedforward decoupling controllers are current controller.
The beneficial effects of the invention are as follows：
It is proposed by the present invention a kind of based on the SVG dynamic passive compensations of PI Feedforward Decouplings and the control method of harmonic wave control,
The load fundamental active current under dq axles is directly extracted, and it is negative under dq axles directly to control the power network current under dq axles to track it
Fundamental active current is carried, thus realizes the purpose of reactive-load compensation harmonic improvement indirectly.Compared to traditional control method, sheet
Invention simplifies control strategy, reduces the complexity of system so that SVG compensation performance is no longer by the detection of idle harmonic
Influence, the zero steady-state error of power network current can be realized in the presence of PI feedforward decoupling controllers, therefore the precision of system obtains
To raising, system cost is significantly reduced, and compensation effect is better than traditional SVG.
Brief description of the drawings
Fig. 1 is the SVG control structure schematic diagrames of the present invention；
Fig. 2 is the PI feed forward decoupling control block diagrams of the present invention；
Fig. 3 is using A phases power network current comparison diagram before and after the inventive method, and figure (a) is the SVG for not utilizing the inventive method
A phase power network current figures, figure (b) be utilize the inventive method SVG A phase power network current figures；
Fig. 4 is to utilize active power, reactive power and power factor (PF) comparison diagram before and after the inventive method, and Fig. 4 (a) is to utilize
Active power, reactive power figure before and after the inventive method, Fig. 4 (b) utilize the power factor (PF) figure before and after the inventive method.
Embodiment
The embodiment of the present invention is described in detail below in conjunction with the accompanying drawings.
As shown in figure 1, a kind of based on the SVG dynamic passive compensations of PI Feedforward Decouplings and the control method of harmonic wave control, bag
DC voltage control, current sample and processing, PI feed forward decoupling controls, SVPWM drivings and three-phase full-bridge inverter is included to mend
Repay harmonic and reactive currents.
Step 1), DC voltage control are used for keeping the stabilization of DC capacitor voltage, are referred to by contrasting DC side
VoltageWith electric capacity virtual voltage Vdc, both differences are input to DC side PI controllers, make virtual voltage VdcReal-time tracking
Reference voltageThe output of DC side PI controllers is added with load current d axle active components.
Step 2), threephase load current signal and the three phase network electricity that current sample collects current transformer with processing
Flow signal to convert by abc/dq respectively, obtain the current component i under dq synchronous rotating framesLd、iLqAnd iSd、iSq；iLd、iLq
D, q axle fundametal compoment of load current are obtained by low pass filter LPFWhereinWith DC side PI in step 1)
The output of controller is added as the d axle fundametal compoments after adjustmentZero is arranged to, as the q axles fundamental wave point after adjustment
AmountI.e. WithAs the reference instruction electric current of PI feedforward decoupling controllers,WithWith the three-phase under dq coordinate systems
Power network current compares, and error signal is input into PI feedforward decoupling controllers.Without detecting the idle electricity loaded in the step
Harmonic electric current is flowed, need to only obtain the d axle fundametal compoments of load current
Step 3), PI feedforward decoupling controllers realize that the decoupling of d, q shaft current and zero stable state to d, q shaft current are missed
Difference tracking, its control block diagram is as shown in figure 3, PI feed forward decoupling controls can realize power network current to load fundamental active current
Zero steady-state error is tracked, and PI feed forward decoupling controls are directly controlled to power network current；PI feedforward decoupling controllers include d axles electricity
Stream controller PI1 and q shaft current controller PI2, PI 1 and PI 2 transmission function is：
Wherein KpFor proportionality coefficient, KiFor integral coefficient；
Transmission function is in assigned frequency ωnThe gain at place is：
In the present inventionWithIt is DC quantity as reference instruction electric current, therefore angular frequencyn=0, so now
PI1 and PI 2 gain are infinity, it is possible to achieve reference current zero steady-state error is tracked；
The decoupling factor of PI feedforward decoupling controllers is ω L, and ω is the synchronous rotary angular speed of dq coordinate systems, and L is three-phase
The filter inductance of full-bridge inverter；
D axle reference instruction electric currentsWith d axle power network currents iSdDifference DELTA iSdD shaft currents are input to as error signal
Controller PI1, q axle power network current iSqIt is multiplied to obtain ω Li with decoupling factor ω LSq, ω LiSqWith d shaft current controllers PI1's
OutputAddition obtains d shaft voltage control signals vd；Q axle reference instruction electric currentsWith q axle power network currents iSqDifference DELTA iSqMake
Q shaft current controller PI2, q shaft current controllers PI2 output is input to for error signalSubtract d axle power network currents iSdWith
Decoupling factor ω L product ω LiSd, obtain q shaft voltage control signals vq；The output signal v of PI feedforward decoupling controllersd、vqThrough
Cross dq/abc conversion and be input to SVPWM drive modules.
Step 4), SVPWM drive modules produce the drive signal of three-phase full-bridge inverter, and three-phase full-bridge inverter is driving
The filtered inductance of thermal compensation signal is produced in the presence of signal to be connected to the grid, and realizes the compensation of harmonic and reactive currents
Fig. 3 (a), (b) are using A phases power network current comparison diagram before and after the inventive method, and figure (a) is not utilize present invention side
The SVG of method, figure (b) are the SVG using the inventive method；From comparison diagram, it is apparent that using the inventive method it
SVG afterwards, harmonic wave are significantly suppressed, and compensation effect is fine.
Fig. 4 (a) and (b) are to utilize active power, reactive power and power factor (PF) comparison diagram before and after the inventive method, Fig. 4
(a) in P be active power, Q be reactive power；It is profit not utilize the SVG of the inventive method before 0.1s, after 0.1s in Fig. 4
With the SVG of the inventive method；, it is apparent that after the SVG using the inventive method from comparison diagram, reactive power obtains
To compensation, power factor (PF) is equal to 1 (Fig. 4 (b)).
Although the illustrative embodiment of the present invention is described above, those skilled in the art can manage
Solution：In the case where not departing from the principle and objective of the present invention, a variety of changes, modification can be carried out to these embodiments.Replace
Change and deform, the scope of the present invention is limited by claim and its coordinate.
Claims (6)
- It is 1. a kind of based on the SVG dynamic passive compensations of PI Feedforward Decouplings and the control method of harmonic wave control, it is characterised in that including Following steps：Step 1), by contrasting DC side reference voltageWith electric capacity virtual voltage Vdc, both differences are input to DC side PI controllers, make virtual voltage VdcReal-time tracking reference voltageThe output of DC side PI controllers and the d axles of load current have Work(component is added；Step 2), threephase load current signal that current transformer collects, three phase network current signal pass through abc/dq respectively Conversion, obtain the current component i under dq synchronous rotating framesLd、iLqAnd iSd、iSq；iLd、iLqObtained by low pass filter LPF To d, q axle fundametal compoment of load currentWhereinOutput with DC side PI controllers in step 1) is added conduct D axle fundametal compoments after adjustment Zero is arranged to, and as the q axle fundametal compoments after adjustment WithFeedovered as PI The reference instruction electric current of decoupling controller,WithCompared with the three phase network electric current under dq coordinate systems, and error signal is defeated Enter to PI feedforward decoupling controllers；Step 3), PI feedforward decoupling controllers realize the decoupling of d, q shaft current and to the zero steady-state error of d, q shaft current with Track, the output signal of PI feedforward decoupling controllers are input to SVPWM drive modules by dq/abc conversion；Step 4), SVPWM drive modules produce the drive signal of three-phase full-bridge inverter, and three-phase full-bridge inverter is in drive signal In the presence of produce the filtered inductance of thermal compensation signal be connected to the grid, realize the compensation of harmonic and reactive currents.
- It is 2. according to claim 1 a kind of based on the SVG dynamic passive compensations of PI Feedforward Decouplings and the control of harmonic wave control Method, it is characterised in that PI feedforward decoupling controllers control including d shaft current controller PI1 and q shaft current in the step 3) Device PI2.
- It is 3. according to claim 2 a kind of based on the SVG dynamic passive compensations of PI Feedforward Decouplings and the control of harmonic wave control Method, it is characterised in that the transmission function of the d shaft currents controller PI1 and q shaft current controller PI2 is Wherein KpFor proportionality coefficient, KiFor integral coefficient.
- It is 4. according to claim 2 a kind of based on the SVG dynamic passive compensations of PI Feedforward Decouplings and the control of harmonic wave control Method, it is characterised in that transmission function is in assigned frequency ωnThe gain at place isWherein ωnFor angular frequency.
- It is 5. according to claim 1 a kind of based on the SVG dynamic passive compensations of PI Feedforward Decouplings and the control of harmonic wave control Method, it is characterised in that the decoupling factor of PI feedforward decoupling controllers is ω L in the step 3), and wherein ω is dq coordinate systems Synchronous rotary angular speed, L be three-phase full-bridge inverter filter inductance.
- It is 6. according to claim 1 a kind of based on the SVG dynamic passive compensations of PI Feedforward Decouplings and the control of harmonic wave control Method, it is characterised in that the PI feedforward decoupling controllers are current controller.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109765420A (en) * | 2019-01-25 | 2019-05-17 | 东北电力大学 | Rapid detection method temporarily drops in a kind of single-phase voltage converted based on Morphologic filters and method of derivation α β-dq |
| CN111130125A (en) * | 2020-01-15 | 2020-05-08 | 西南交通大学 | Reactive compensation method of converter and control method of converter |
| CN111668855A (en) * | 2020-05-27 | 2020-09-15 | 广州智光电气技术有限公司 | Control method and device for angular static var generator |
| CN111799796A (en) * | 2020-07-02 | 2020-10-20 | 云南电网有限责任公司电力科学研究院 | Output harmonic suppression method of H-bridge cascaded static synchronous compensator |
| CN112653346A (en) * | 2020-09-14 | 2021-04-13 | 北京科技大学 | Inverter feed-forward control method and system under three-phase load unbalance condition |
| CN112701941A (en) * | 2019-10-21 | 2021-04-23 | 广东美的白色家电技术创新中心有限公司 | Inverter compensation method and device, electrical equipment and storage medium |
| CN113054858A (en) * | 2021-03-30 | 2021-06-29 | 天津航空机电有限公司 | Control method and system for load sudden change time adjustment of three-phase PWM rectifier |
| CN113141062A (en) * | 2021-04-23 | 2021-07-20 | 新疆大学 | Wireless power transmission system and phase shift keying communication feedforward compensation method thereof |
| CN113746357A (en) * | 2021-11-08 | 2021-12-03 | 四川大学 | Electrolytic hydrogen production rectification power supply based on two-stage auxiliary converter and power supply control method |
| CN114512991A (en) * | 2022-02-23 | 2022-05-17 | 合肥工业大学 | Active harmonic and reactive power generation system and method |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109765420A (en) * | 2019-01-25 | 2019-05-17 | 东北电力大学 | Rapid detection method temporarily drops in a kind of single-phase voltage converted based on Morphologic filters and method of derivation α β-dq |
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| CN112653346A (en) * | 2020-09-14 | 2021-04-13 | 北京科技大学 | Inverter feed-forward control method and system under three-phase load unbalance condition |
| CN113054858A (en) * | 2021-03-30 | 2021-06-29 | 天津航空机电有限公司 | Control method and system for load sudden change time adjustment of three-phase PWM rectifier |
| CN113141062B (en) * | 2021-04-23 | 2023-01-31 | 新疆大学 | Wireless power transmission system and phase shift keying communication feedforward compensation method thereof |
| CN113141062A (en) * | 2021-04-23 | 2021-07-20 | 新疆大学 | Wireless power transmission system and phase shift keying communication feedforward compensation method thereof |
| CN113746357B (en) * | 2021-11-08 | 2022-02-11 | 四川大学 | Electrolytic hydrogen production rectification power supply based on two-stage auxiliary converter and power supply control method |
| CN113746357A (en) * | 2021-11-08 | 2021-12-03 | 四川大学 | Electrolytic hydrogen production rectification power supply based on two-stage auxiliary converter and power supply control method |
| CN114512991A (en) * | 2022-02-23 | 2022-05-17 | 合肥工业大学 | Active harmonic and reactive power generation system and method |
| CN114512991B (en) * | 2022-02-23 | 2024-04-02 | 合肥工业大学 | Active harmonic and reactive power generation system and method |
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