CN106972735B - A kind of novel FCS-MPC low switching frequency control method - Google Patents
A kind of novel FCS-MPC low switching frequency control method Download PDFInfo
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- CN106972735B CN106972735B CN201710045102.9A CN201710045102A CN106972735B CN 106972735 B CN106972735 B CN 106972735B CN 201710045102 A CN201710045102 A CN 201710045102A CN 106972735 B CN106972735 B CN 106972735B
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Classifications
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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
- H02M1/00—Details of apparatus for conversion
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
-
- 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
- H02M1/0048—Circuits or arrangements for reducing losses
-
- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
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- Inverter Devices (AREA)
Abstract
A kind of novel FCS-MPC low switching frequency control method, is related to converters control field.Method includes the following steps: actual value samples and is applied with the combination of optimized switching selected by the period；Control compensation of delay；The current forecasting in following two control periods is realized based on prediction time domain extension principle；Selected effective switch combination is evaluated according to system value function, chooses optimized switching compound action in next control period；Next control period repeats the above process.This method effectively prevents unnecessary switching during adjacent control week, reduce system switching frequency, and it is not limited by converters topological structure and prediction model, and without associated weight factor problem of tuning, algorithm clear concept, it is easily achieved, while not increasing control system computational burden, do not influence control system dynamic property.
Description
Technical field
It is specifically a kind of to be suitable for FCS-MPC control system the present invention relates to converters control technology field
Low switching frequency control method.
Background technique
Converters are especially high-power multi-level frequency conversion device, and the switching loss of switching device is with its electricity
The raising of grade and the increase of power grade are pressed, has become the most important power loss part of converter plant, and high-power change
The low switching frequency of frequency device is run, and not only can effectively be dropped the power loss of its own, be additionally aided the output work of aggrandizement apparatus
Rate simultaneously improves its output current capacity.Therefore, the development of high-power multilevel power electronic converter and its in energy-saving
Popularization and application, first have to solve low switching frequency control problem.
It is being based on FCS-MPC (finite aggregate Model Predictive Control, Finite_Control_Set Model Predictive
Control in converters control system), since FCS-MPC policy optimization performance function form, content be not solid
It is fixed, it is easily handled nonlinear restriction and realizes multi objective control, the addition switching loss constraint in optimization performance function can be passed through
Mode with realize converter low switching frequency control.This method clear concept, it can be readily appreciated that but there are weight coefficients to be difficult to
Problem of tuning, and the low switching frequency control being only able to achieve in the following control period.To realize following multiple control weeks
Low switching frequency control in phase, at present existing method be using Multi-step predictive control mode, but multistep forecasting method will make it is pre-
It is in exponential increase to survey operand, causes controller computational burden overweight, it is difficult to realize.
From both at home and abroad about the present Research analysis of low switching frequency from the point of view of, based on the scheme of FCS-MPC because it is intrinsic
Multi-constraint condition, multiple target task processing capacity are all shown in terms of different topology structure converter low switching frequency control
Extremely strong adaptability and control potential, but there are no one so far to be suitable for all converters topologys, without weight
Factor problem of tuning, and the low switching frequency control method of FCS-MPC control system operand is not influenced,
Summary of the invention
For the low switching frequency control problem for solving the converters based on FCS-MPC strategy, the present invention is proposed
A kind of novel FCS-MPC low switching frequency control method.This method is based on FCS-MPC basic principle, is predicted by extension
Time domain length in prediction model is directly two control periods by a control period expansion, made by the method for time domain length
The system control that selected optimized switching vector can satisfy in following two control periods requires, so as to avoid two neighboring week
Period unnecessary switching realizes the low switching frequency control of converters.Because of the novel low switching frequency
Optimized switching vector selected by control strategy still acts only on next control period, the optimized switching vector in second control period
It still needs to be predicted again according to next control periodic system state, to ensure that the dynamic property of system is unaffected.
The present invention is realized with following technical solution:
(1) t is detectedkMoment current actual value；
(2) the optimized switching vector s (k) for applying period forecasting in novel FCS-MPC low switching frequency control method, that is, control
The optimized switching vector of the optimized switching vector that a cycle period is selected in step (6) on device processed, period 1 is opened from zero vector
Begin；
(3) compensation of delay, prediction s (k) act on lower tk+1The current value i at momentp(tk+1)
In formula
(4) the current forecasting i based on prediction time domain extensionp(tk+3)
It (5) is the versatility for embodying the novel low switching frequency control method, the optimization of high-power multi-electrical level inverter
Energy index only considers that current following and common-mode voltage inhibit, and using the method for weight factor linear weighted function building optimization performance
Function such as, in formula, λcmvFor weight factor；gcmvFor common-mode voltage, using absolute value form；
(6) according to (5), performance function evaluation, choosing are optimized to all switching vector selectors of high-power multi-electrical level inverter
Taking makes tk+3The smallest switching vector selector of time optimization performance function min (g) is as optimized switching vector s (k+1), in tk+1Moment is made
For converter；
(7)tk+1Moment repeats the above process.
Within the scope of complete modulation degree, which all has ideal low switching frequency control
Effect processed, can be controlled in 125--400Hz.
When prediction time domain length is TSWhen, tkOptimized switching vector selected by moment is s2, tk+1The arrow of optimized switching selected by moment
Amount is s3；When prediction time domain length is 2TSWhen, tkSwitching vector selector selected by moment is s3, tk+1Switching vector selector selected by moment is still s3,
Although t at this timekSwitching vector selector selected by moment is not [(k+1) TS,(k+2)TS] control the period in optimized switching vector, but for
Two control period [(k+1) T of futureS,(k+3)TS] it is able to satisfy control requirement, and avoid [(k+1) TS,(k+2)TS] control
Period processed and [(k+2) TS,(k+3)TS] unnecessary switching during week is controlled, to can effectively reduce switching frequency.Cause
tkMoment is still only acted on using optimized switching vector selected by the novel low switching frequency control strategy based on prediction time domain extension
In [(k+1) TS,(k+2)TS] the control period, [(k+2) TS,(k+3)TS] control the period optimized switching vector still need to according to tk+1
Moment system mode is predicted again, to ensure that the dynamic property of system is unaffected.
The beneficial effects of the present invention are:
(1) unnecessary switching during adjacent control week is effectively prevented, system switching frequency is reduced；
(2) it is not limited by converters topological structure and prediction model；
(3) without associated weight factor problem of tuning, algorithm clear concept, it is easy to accomplish；
(4) control system computational burden is not increased；
(5) control system dynamic property is not influenced.
Detailed description of the invention
Fig. 1 is prediction time domain length TSSchematic illustration
Fig. 2 is prediction time domain length 2TSSchematic illustration
Fig. 3 is to apply the novel FCS-MPC low switching frequency control method harmonic distortion comparison diagram
Fig. 4 is to apply the novel FCS-MPC low switching frequency control method frequency comparison figure
Specific embodiment
With reference to the accompanying drawing, the present invention is made with traditional weight factor method high-power multi-electrical level inverter FCS-MPC system
It further illustrates, the specific implementation step of the novel FCS-MPC low switching frequency control method is as follows:
1) t is detectedkMoment current actual value；
2) the optimized switching vector s (k) for applying period forecasting in novel FCS-MPC low switching frequency control method, that is, control
The optimized switching vector that a cycle period is selected in step 6) on device processed (open from zero vector by the optimized switching vector of period 1
Begin)；
3) compensation of delay, prediction s (k) act on lower tk+1The current value i at momentp(tk+1), 1.；
In formula
4) the novel low switching frequency current forecasting i based on prediction time domain extensionp(tk+3), 2.；
It 5) is the versatility for embodying the novel low switching frequency control method, the optimization performance of high-power multi-electrical level inverter
Index only considers that current following and common-mode voltage inhibit, and using the method for weight factor linear weighted function building optimization performance letter
It counts such as formula 3., in formula, λcmvFor weight factor；gcmvFor common-mode voltage, using absolute value form；
6) performance function evaluation, choosing 3. according to formula, are optimized to all switching vector selectors of high-power multi-electrical level inverter
Taking makes tk+3The smallest switching vector selector of time optimization performance function min (g) is as optimized switching vector s (k+1), in tk+1Moment is made
For converter；
7)tk+1Moment repeats the above process.
Traditional its prediction model of FCS-MPC method such as formula is 1. shown, and the electric current for being only capable of the completion following control period is pre-
It surveys；Its prediction model of novel FCS-MPC low switching frequency control method such as formula is 2. shown, the electricity in achievable following two periods
Stream prediction.Therefore, applying need not during can effectively avoid adjacent control week after the novel FCS-MPC low switching frequency control method
The switching wanted reduces system switching frequency, and this method is not limited by converters topological structure and prediction model
System, without associated weight factor problem of tuning, algorithm clear concept, it is easy to accomplish, do not increase control system computational burden, do not influence
Control system dynamic property.The control that Fig. 3,4 show the novel FCS-MPC low switch control method Yu tradition FCS-MPC method
Effect processed compares figure.Curve 1 is tradition FCS-MPC method in figure, and curve 2 is proposed novel FCS-MPC method by the present invention, shown
Within the scope of complete modulation degree, which all has ideal low switching frequency control effect,
It is can be controlled in 125--400Hz, only percent harmonic distortion slightly increases, but changes less, especially when current-modulation degree is 0.81
Low switching frequency drop control effect is most obvious, and the range of decrease is up to 48%.
Claims (2)
1. a kind of FCS-MPC low switching frequency control method, it is characterised in that: include the following steps:
(1) t is detectedkMoment current actual value；
(2) it is applied with the optimized switching vector s (k) of period forecasting, the optimized switching vector of period 1 is since zero vector；
(3) compensation of delay, prediction s (k) act on lower tk+1The current value i at momentp(tk+1)
In formula
(4) the current forecasting i based on prediction time domain extensionp(tk+3)
(5) optimality criterion of high-power multi-electrical level inverter only considers that current following and common-mode voltage inhibit, and uses
The method building optimization performance function such as following formula of weight factor linear weighted function, using absolute value form, in formula, λcmvFor weight because
Son；gcmvFor common-mode voltage,
(6) first by all switching vector selector t of (4) prediction multi-electrical level inverterk+3Then moment current value is optimized according to (5)
Performance function evaluation, selection make tk+3The smallest switching vector selector of time optimization performance function min (g) is as optimized switching vector s (k
+ 1), in tk+1Moment acts on converter；
(7)tk+1Moment repeats the above process.
2. a kind of FCS-MPC low switching frequency control method according to claim 1, it is characterised in that: in complete modulation degree
In range, low switching frequency is controlled in 125--400Hz.
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| CN107834815B (en) * | 2017-10-31 | 2021-02-19 | 华南理工大学 | Finite control set model prediction control method based on double-vector action |
| CN109085765A (en) * | 2018-08-06 | 2018-12-25 | 江苏师范大学 | Three level active power filter rapid model prediction control method of neutral-point-clamped formula |
| CN109995287A (en) * | 2019-03-19 | 2019-07-09 | 淮海工学院 | A kind of twin inverter opens the Optimized model forecast Control Algorithm of winding induction motor |
| CN111277156B (en) * | 2020-03-16 | 2021-07-23 | 江苏师范大学 | Multi-level inverter FCS-MPC control method without weight factors |
| CN111682791B (en) * | 2020-06-23 | 2021-10-12 | 江苏师范大学 | Two-stage finite set model prediction control method |
| CN112054656A (en) * | 2020-09-25 | 2020-12-08 | 安徽理工大学 | Model predictive control algorithm with fixed switching frequency |
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| Nonlinear FCS-MPC strategy of NPC/H-5 L inverter based on satisfactory optimization algorithm;guifeng wang;《Chaos, Solitons and Fractals》;20160831;第353-362页 |
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Effective date of registration: 20240428 Address after: 030000, 2nd Floor, Office Building, No. 39 Zhengyang Street, Taiyuan Tanghuai Industrial Park, Shanxi Comprehensive Reform Demonstration Zone, Taiyuan City, Shanxi Province Patentee after: Shanxi powerlotus Electrical Engineering Co.,Ltd. Country or region after: China Address before: 221100 Xuzhou National Security Technology Industrial Park, Lijiang Road, High tech Zone, Xuzhou City, Jiangsu Province Patentee before: Jiangsu Kelu Electric Co.,Ltd. Country or region before: China |