CN109391165A - A kind of interference compensation method based on Modular multilevel converter Circulation Model - Google Patents
A kind of interference compensation method based on Modular multilevel converter Circulation Model Download PDFInfo
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- CN109391165A CN109391165A CN201811440070.3A CN201811440070A CN109391165A CN 109391165 A CN109391165 A CN 109391165A CN 201811440070 A CN201811440070 A CN 201811440070A CN 109391165 A CN109391165 A CN 109391165A
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- interference
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- modular multilevel
- multilevel converter
- circulation
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- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
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Abstract
The invention discloses a kind of interference compensation methods based on Modular multilevel converter Circulation Model, by estimating the interference such as inductance parameters mismatch, DC voltage fluctuation present in control system, to be compensated in former Controlling model to interference, it is final to improve controller performance, improve system stability.It is primarily based on circuit theory and establishes modularization multi-level converter Circulation Model, secondly application forward Euler's formula by model discretization, then distracter is added in circulation discrete model, and it is rewritten as linear discrete system canonical form, linear discrete interference observer is designed based on the system again, and POLE PLACEMENT USING COEFFICIENT K is calculated, finally interference estimate substitution circulation discrete model is compensated.Estimated using the interference that the present invention can generate model parameter mismatch and DC voltage fluctuation, is compensated in Controlling model, so as to improve controller performance.
Description
Technical field
The invention belongs to high-voltage and high-power power electronic converter fields, and in particular to one kind is become based on modular multilevel
The interference compensation method of parallel operation Circulation Model.
Background technique
Modular multilevel converter (Modular Multilevel Converter, MMC) is since being suggested, and one
Directly widely paid close attention to.The output voltage of high quality, the extension of flexible level and active and reactive power independent control
Ability makes it suffer from huge researching value and application sky in fields such as flexible DC transmission, AC Drive, distributed power generations
Between.However, as a kind of emerging circuit topological structure, certainly existing some problems has to be solved, and one of circulation is exactly.
Since the three-phase bridge arm of MMC is all parallel on direct current side bus, and voltage when system operation between three-phase bridge arm can have one
Fixed pressure difference, this allows for necessarily will appear circulation between three-phase bridge arm, so that bridge arm current be made to be distorted, increases system damage
Consumption reduces power transmission efficiency.
Have many control methods at present to be controlled for circulation, wherein Model Predictive Control (Model
Predictive Control, MPC) because its modulator approach is simple, control target is flexible, is suitable for the advantages such as nonlinear system,
As effective circulation control means.But there is no consider parameter mismatch and direct current present in real system by traditional MPC
The interference such as pressure fluctuation, such as bridge arm inductance value change with temperature, frequency and service life factor, and DC voltage is with derailing switch
Part loss, grid power quality problem and generate fluctuation, these interference be difficult it is real-time, accurately measure, control system can be caused
It is unstable, therefore this method is at present in practical projects using less.
Summary of the invention
Goal of the invention: the present invention proposes a kind of interference compensation method based on Modular multilevel converter Circulation Model,
The interference that can be generated to model parameter mismatch and DC voltage fluctuation is estimated, compensates in Controlling model, thus
Improve controller performance.
Technical solution: the present invention proposes a kind of interference compensation method based on Modular multilevel converter Circulation Model,
The following steps are included:
(1) Modular multilevel converter Circulation Model is established；
(2) by Modular multilevel converter Circulation Model discretization；
(3) distracter is added in Modular multilevel converter circulation discrete model, and is rewritten as linear discrete system
Canonical form；
(4) linear discrete interference observer, the interference value of observation system are designed based on the system；
(5) POLE PLACEMENT USING COEFFICIENT K is calculated；
(6) interference estimate substitution circulation discrete model is compensated, building modularization multi-level converter is anti-interference
Circulation Model.
Modular multilevel converter Circulation Model described in step (1) are as follows:
Wherein, VdcIt is DC voltage, epkIt is upper bridge arm voltage, enkIt is lower bridge arm voltage, R is arm resistance, and L is bridge
Arm inductance, idiffkIt is out-of-balance current, ipkIt is upper bridge arm current, inkIt is lower bridge arm electric current, k=a, b, c respectively indicate a phase, b
Phase, c phase.
Modular multilevel converter Circulation Model after discretization described in step (2) are as follows:
Wherein, TsIt is the sampling time.
Linear discrete system canonical form described in step (3) are as follows:
Wherein, yknIt is measurement output, Φ=1, Γ=Ts/ 2L, G=Ts/ 2, C=1.
Interference value described in step (4) are as follows:
Wherein,It is interference estimate, zknIt is state variable, K is POLE PLACEMENT USING coefficient.
POLE PLACEMENT USING COEFFICIENT K described in step (5) are as follows:
Wherein, the value of λ is bigger, and the precision of Interference Estimation is higher, postpones higher；The value of λ is smaller, the fluctuation of interference estimate
It is bigger, postpone lower.
The anti-interference Circulation Model of modularization multi-level converter described in step (6) described in step (6) are as follows:
The utility model has the advantages that compared with prior art, beneficial effects of the present invention: by model parameter mismatch and DC voltage
The interference that fluctuation generates is estimated, is compensated interference estimate introducing Circulation Model by the way of feedforward compensation, from
And influence of the interference to system is eliminated on the basis of not changing original control performance, the compensation method that the present invention uses passes through soft
Part is realized, and calculation amount is small.
Detailed description of the invention
Fig. 1 is flow chart of the invention；
Fig. 2 is the Model Predictive Control functional block diagram of additional interference observer.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.As shown in Fig. 2, designed linear discrete is interfered
Observer is applied to MPC circulation controller, to inhibit by inductance parameters mismatch and DC voltage fluctuation bring interference.This hair
Bright system nominal power is 1.2MW by taking MMC gird-connected inverter as an example, and exchange side voltage is 9.8kV, frequency 50Hz, bridge arm electricity
Sense is 0.02H, and DC voltage 20kV, the sampling time is 20 μ s.Fig. 1 is flow chart of the invention, comprising the following steps:
(1) Modular multilevel converter Circulation Model is established.
In formula: VdcIt is DC voltage, epkIt is upper bridge arm voltage, enkIt is lower bridge arm voltage, R is arm resistance, and L is bridge
Arm inductance, idiffkIt is out-of-balance current, ipkIt is upper bridge arm current, inkIt is lower bridge arm electric current, k=a, b, c respectively indicate a phase, b
Phase, c phase.
(2) application forward Euler's formula by Modular multilevel converter Circulation Model discretization.
Negligible resistance R can be obtained using Euler's formula forward by formula (1) discretization:
In formula: TsIt is the sampling time.
(3) distracter is added in Modular multilevel converter circulation discrete model, and is rewritten as linear discrete system
Canonical form.
Distracter is added in formula (3), enables:
xk,n+1=idiffk(t+Ts) (4)
xkn=idiffk(t) (5)
ukn=Vdc(t)-[(epk(t+Ts)+enk(t+Ts)] (6)
In formula: xknIt is state variable, uknIt is control input, dknIt is interference actual value, Δ L is the variable quantity of L, Δ Vdc(t)
It is Vdc(t) variable quantity.
Formula (3) is rewritten as linear discrete system canonical form:
In formula: yknIt is measurement output, Φ=1, Γ=Ts/ 2L=0.0005, G=Ts/ 2=0.00001, C=1.
(4) linear discrete interference observer, the interference value of observation system are designed based on the system.
In formula:It is interference estimate, zknIt is state variable, K is POLE PLACEMENT USING coefficient.
(5) according to the evaluated error dynamic characteristic of system, POLE PLACEMENT USING COEFFICIENT K is calculated.
λ=0 is taken in the present embodiment.
So far the calculation expression of available interference estimate are as follows:
(6) interference estimate substitution circulation discrete model is compensated, building modularization multi-level converter is anti-interference
Circulation Model.
Interference estimate is substituted into formula (3)
Formula (7) is the expression formula of actual interference value in step 3, in systems in practice Δ VdcThe feelings measured are not easy with Δ L
Under condition, the estimated value of interference can be calculated by formula (11) in this method step 5, interference estimate is added in by step 6
In model, when interfering generation, i.e. Δ VdcWhen being not zero with Δ L, compensated Circulation Model can the practical system of accurate description
System, to eliminate interference.Pass through formula (12) approximate description formula (13)
Claims (7)
1. a kind of interference compensation method based on Modular multilevel converter Circulation Model, which is characterized in that including following step
It is rapid:
(1) Modular multilevel converter Circulation Model is established；
(2) by Modular multilevel converter Circulation Model discretization；
(3) distracter is added in Modular multilevel converter circulation discrete model, and is rewritten as linear discrete system standard
Form；
(4) linear discrete interference observer, the interference value of observation system are designed based on the system；
(5) POLE PLACEMENT USING COEFFICIENT K is calculated；
(6) interference estimate substitution circulation discrete model is compensated, constructs the anti-interference circulation of modularization multi-level converter
Model.
2. a kind of interference compensation method based on Modular multilevel converter Circulation Model according to claim 1,
It is characterized in that, Modular multilevel converter Circulation Model described in step (1) are as follows:
Wherein, VdcIt is DC voltage, epkIt is upper bridge arm voltage, enkIt is lower bridge arm voltage, R is arm resistance, and L is bridge arm electricity
Sense, idiffkIt is out-of-balance current, ipkIt is upper bridge arm current, inkIt is lower bridge arm electric current, k=a, b, c respectively indicate a phase, b phase, c
Phase.
3. a kind of interference compensation method based on Modular multilevel converter Circulation Model according to claim 1,
It is characterized in that, the Modular multilevel converter Circulation Model after discretization described in step (2) are as follows:
Wherein, TsIt is the sampling time.
4. a kind of interference compensation method based on Modular multilevel converter Circulation Model according to claim 1,
It is characterized in that, linear discrete system canonical form described in step (3) are as follows:
Wherein, yknIt is measurement output, Φ=1, Γ=Ts/ 2L, G=Ts/ 2, C=1.
5. a kind of interference compensation method based on Modular multilevel converter Circulation Model according to claim 1,
It is characterized in that, interference value described in step (4) are as follows:
Wherein,It is interference estimate, zknIt is state variable, K is POLE PLACEMENT USING coefficient.
6. a kind of interference compensation method based on Modular multilevel converter Circulation Model according to claim 1,
It is characterized in that, POLE PLACEMENT USING COEFFICIENT K described in step (5) are as follows:
Wherein, the value of λ is bigger, and the precision of Interference Estimation is higher, postpones higher；The value of λ is smaller, and the fluctuation of interference estimate is got over
Greatly, postpone lower.
7. a kind of interference compensation method based on Modular multilevel converter Circulation Model according to claim 1,
It is characterized in that, the anti-interference Circulation Model of modularization multi-level converter described in step (6) described in step (6) are as follows:
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115632545A (en) * | 2022-12-06 | 2023-01-20 | 深圳市永联科技股份有限公司 | Control method and system for power supply circulation |
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| CN107168071A (en) * | 2017-07-17 | 2017-09-15 | 北京航空航天大学 | A kind of nonlinear system Auto-disturbance-rejection Control based on interference observer |
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| CN206595895U (en) * | 2016-06-28 | 2017-10-27 | 南京比恩机电科技有限公司 | High voltage high frequency bursts static dust-removing power antidisturbance control system |
| CN107168071A (en) * | 2017-07-17 | 2017-09-15 | 北京航空航天大学 | A kind of nonlinear system Auto-disturbance-rejection Control based on interference observer |
Non-Patent Citations (1)
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| XILIANG CHEN等: "Common-mode Interference Study of a Auxiliary Power Supply Based on the Serialization of SiC MOSFETs for MMC-HVDC System", 《2016 IEEE 8TH INTERNATIONAL POWER ELECTRONICS AND MOTION CONTROL CONFERENCE (IPEMC-ECCE ASIA)》 * |
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| CN115632545A (en) * | 2022-12-06 | 2023-01-20 | 深圳市永联科技股份有限公司 | Control method and system for power supply circulation |
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