CN106972735A - A kind of new FCS MPC low switching frequency control methods - Google Patents
A kind of new FCS MPC low switching frequency control methods Download PDFInfo
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- CN106972735A CN106972735A CN201710045102.9A CN201710045102A CN106972735A CN 106972735 A CN106972735 A CN 106972735A CN 201710045102 A CN201710045102 A CN 201710045102A CN 106972735 A CN106972735 A CN 106972735A
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- 238000000034 method Methods 0.000 title claims abstract description 41
- 230000008569 process Effects 0.000 claims abstract description 4
- 238000005457 optimization Methods 0.000 claims description 11
- 238000011156 evaluation Methods 0.000 claims description 3
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- 230000003864 performance function Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000011217 control strategy Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
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- 238000013277 forecasting method Methods 0.000 description 1
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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)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
A kind of new FCS MPC low switching frequency control methods, are related to converters control field.This method comprises the following steps：Actual value is sampled and is applied with optimized switching selected by the cycle and combines；Control compensation of delay；The current forecasting of following two controlling cycles is realized based on prediction time domain extension principle；Effective switch combination is evaluated according to selected by system value function pair, chooses optimized switching compound action in next controlling cycle；Next controlling cycle repeats said process.This method effectively prevent switch switching unnecessary between adjacent controlling cycle, reduce system switching frequency, and do not limited by converters topological structure and forecast model, and without associated weight factor problem of tuning, algorithm clear concept, it is easily achieved, while not increasing control system computational burden, control system dynamic property is not influenceed.
Description
Technical field
It is specifically that one kind is applied to FCS-MPC control systems the present invention relates to converters control technology field
Low switching frequency control method.
Background technology
Converters are particularly high-power multi-level frequency conversion device, and the switching loss of its switching device is with it
The rise of voltage class and the increase of power grade, have become the topmost power attenuation part of converter plant, and high-power
The low switching frequency operation of converter plant, not only can effectively drop the power attenuation of its own, additionally aid the output of aggrandizement apparatus
Power simultaneously improves its output current ability.Therefore, the development of high-power multilevel power electronic converter and its energy-saving
In popularization and application, first have to solve low switching frequency control problem.
Based on FCS-MPC (finite aggregate Model Predictive Control, Finite_Control_Set Model Predictive
Control in converters control system), because FCS-MPC policy optimization performance functions form, content be not solid
It is fixed, it is easy to handle nonlinear restriction and realize 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 to there is weight coefficient difficult
With problem of tuning, and it is only capable of realizing the low switching frequency control in a following controlling cycle.To realize following multiple controls
Low switching frequency control in cycle, it is to use Multi-step predictive control mode that method is had at present, but multistep forecasting method will make
Predict that operand is in exponential increase, cause controller computational burden overweight, it is difficult to realize.
From the point of view of present Research analysis both at home and abroad on low switching frequency, the scheme based on FCS-MPC is intrinsic because of it
Multi-constraint condition, multiple target task disposal ability, all show in different topology structure converter low switching frequency control aspect
Extremely strong adaptability and control potential, but neither one is gone back so far suitable for all converters topology, without weight
Factor problem of tuning, and do not influence the low switching frequency control method of FCS-MPC control system operands,
The content of the invention
To solve the low switching frequency control problem of the converters based on FCS-MPC strategies, the present invention is proposed
A kind of new FCS-MPC low switching frequency control methods.This method is based on FCS-MPC general principles, is predicted by extending
The method of time domain length, directly expands to two controlling cycles by a controlling cycle by the time domain length in forecast model, makes
Selected optimized switching vector disclosure satisfy that the system control in following two controlling cycles is required, so as to avoid two neighboring
Unnecessary switch switching during week, realizes the low switching frequency control of converters.Because of the new low switch frequency
Optimized switching vector selected by rate control strategy still acts only on next controlling cycle, the optimized switching of second controlling cycle
Vector still needs to be predicted again according to next controlling cycle system mode, so as to ensure that the dynamic property of system is unaffected.
The present invention is realized with following technical scheme：
(1) t is detectedkMoment current actual value；
(2) the optimized switching vector s (k) of period forecasting in new FCS-MPC low switching frequencies control method is applied, i.e.,
The optimized switching vector that a cycle period is selected in step (6) on controller, the optimized switching vector of period 1 is from zero vector
Start；
(3) compensation of delay, the lower t of prediction s (k) effectsk+1The current value i at momentp(tk+1)
In formula
(4) the current forecasting i based on prediction time domain extensionp(tk+3)
(5) it is the versatility of the embodiment new 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 suppress, and builds optimization property using the method for weight factor linear weighted function
Can function such as, in formula, λcmvFor weight factor；gcmvFor common-mode voltage, using absolute value form；
(6) according to (5), performance function evaluation is optimized to all switching vector selectors of high-power multi-electrical level inverter, selected
Taking makes tk+3Switching vector selector minimum time optimization performance function min (g) is as optimized switching vector s (k+1), in tk+1Moment
Act on converter；
(7)tk+1Moment repeats said process.
In the range of complete modulation degree, the new low switching frequency control method all has ideal low switching frequency
Control effect, can be controlled in 125--400Hz.
When prediction time domain length is TSWhen, tkOptimized switching vector selected by moment is s2, tk+1Optimized switching selected by moment is sweared
Measure as 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 now tkNot [(k+1) T of switching vector selector selected by momentS,(k+2)TS] optimized switching vector in controlling cycle, but it is right
In two controlling cycle [(k+1) T of futureS,(k+3)TS] control requirement can be met, and avoid [(k+1) TS,(k+2)TS]
Controlling cycle and [(k+2) TS,(k+3)TS] switch switching unnecessary between controlling cycle, so as to effectively reduction switching frequency.
Because of tkMoment is still only made using optimized switching vector selected by the new low switching frequency control strategy based on prediction time domain extension
For [(k+1) TS,(k+2)TS] controlling cycle, [(k+2) TS,(k+3)TS] the optimized switching vector of controlling cycle still needs to basis
tk+1Moment system mode is predicted again, so as to ensure that the dynamic property of system is unaffected.
The beneficial effects of the invention are as follows：
(1) switch switching unnecessary between adjacent controlling cycle is effectively prevent, system switching frequency is reduced；
(2) do not limited by converters topological structure and forecast 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 influenceed.
Brief description of the drawings
Fig. 1 is prediction time domain length TSPrinciple schematic
Fig. 2 is prediction time domain length 2TSPrinciple schematic
Fig. 3 is to apply the new FCS-MPC low switching frequencies control method harmonic distortion comparison diagram
Fig. 4 is to apply the new FCS-MPC low switching frequencies control method frequency contrast figure
Embodiment
Below in conjunction with the accompanying drawings, the present invention is made with traditional weight factor method high-power multi-electrical level inverter FCS-MPC systems
Further illustrate, the specific implementation step of the new FCS-MPC low switching frequencies control method is as follows：
1) t is detectedkMoment current actual value；
2) apply the optimized switching vector s (k) of period forecasting in new FCS-MPC low switching frequencies control method, that is, control
A cycle period is in step 6 on device processed) selection optimized switching vector (the optimized switching vector of period 1 is opened from zero vector
Begin)；
3) compensation of delay, the lower t of prediction s (k) effectsk+1The current value i at momentp(tk+1), 1.；
In formula
4) the new low switching frequency current forecasting i based on prediction time domain extensionp(tk+3), 2.；
5) it is the versatility of the embodiment new 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 suppress, and builds optimization property using the method for weight factor linear weighted function
Can function for example formula 3., in formula, λcmvFor weight factor；gcmvFor common-mode voltage, using absolute value form；
6) performance function evaluation according to formula 3., is optimized to all switching vector selectors of high-power multi-electrical level inverter, selected
Taking makes tk+3Switching vector selector minimum time optimization performance function min (g) is as optimized switching vector s (k+1), in tk+1Moment
Act on converter；
7)tk+1Moment repeats said process.
Traditional its forecast model of FCS-MPC methods as formula 1. shown in, the electric current for being only capable of completing a following controlling cycle is pre-
Survey；Its forecast model of new FCS-MPC low switching frequencies control method as formula 2. shown in, following two cycles can be completed
Current forecasting.Therefore, it can be prevented effectively between adjacent controlling cycle after applying the new FCS-MPC low switching frequencies control method
Unnecessary switch switching, reduces system switching frequency, and this method is not by converters topological structure and prediction mould
Type limitation, without associated weight factor problem of tuning, algorithm clear concept, it is easy to accomplish, do not increase control system computational burden,
Control system dynamic property is not influenceed.Fig. 3,4 show the new FCS-MPC low switches control method and traditional FCS-MPC side
The control effect of method compares figure.Curve 1 is tradition FCS-MPC methods in figure, and curve 2 is carried new FCS-MPC by the present invention
Method, shows in the range of complete modulation degree, and the new low switching frequency control method all has ideal low switching frequency
Control effect, can be controlled in 125--400Hz, only percent harmonic distortion slightly has rise, but change is little, particularly in current-modulation
Spend for 0.81 when low switching frequency drop control effect it is most obvious, the range of decrease is up to 48%.
Claims (2)
1. a kind of new FCS-MPC low switching frequencies control method, it is characterised in that：Comprise the following steps：
(1) t is detectedkMoment current actual value；
(2) the optimized switching vector s (k) of period forecasting in new FCS-MPC low switching frequencies control method, i.e. controller are applied
The optimized switching vector that a upper cycle period is selected in step (6), the optimized switching vector of period 1 is since zero vector；
(3) compensation of delay, the lower t of prediction s (k) effectsk+1The current value i at momentp(tk+1)
In formula
(4) the current forecasting i based on prediction time domain extensionp(tk+3)
(5) it is the versatility of the embodiment new low switching frequency control method, the optimization performance of high-power multi-electrical level inverter refers to
Mark only considers that current following and common-mode voltage suppress, and builds optimization performance function using the method for weight factor linear weighted function
Such as, in formula, λcmvFor weight factor；gcmvFor common-mode voltage, using absolute value form；
(6) according to (5), performance function evaluation is optimized to all switching vector selectors of high-power multi-electrical level inverter, selection makes
tk+3Switching vector selector minimum time optimization performance function min (g) is as optimized switching vector s (k+1), in tk+1Moment acts on
Converter；
(7)tk+1Moment repeats said process.
2. a kind of new FCS-MPC low switching frequencies control method according to claim 1, it is characterised in that：Adjusting entirely
In system range, low switching frequency is controlled in 125--400Hz.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107834815A (en) * | 2017-10-31 | 2018-03-23 | 华南理工大学 | A kind of limited domination set model predictive control method based on the effect of double vectors |
| 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 |
| CN111277156A (en) * | 2020-03-16 | 2020-06-12 | 江苏师范大学 | Multi-level inverter FCS-MPC control method without weight factors |
| CN111682791A (en) * | 2020-06-23 | 2020-09-18 | 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 |
-
2017
- 2017-01-19 CN CN201710045102.9A patent/CN106972735B/en active Active
Non-Patent Citations (2)
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| GUIFENG WANG: "Nonlinear FCS-MPC strategy of NPC/H-5 L inverter based on satisfactory optimization algorithm", 《CHAOS, SOLITONS AND FRACTALS》 * |
| SEYED ALIREZA DAVARI: "Using a Weighting Factor Table for FCS-MPC of Induction Motors with Extended Prediction Horizon", 《2012 IEEE》 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107834815A (en) * | 2017-10-31 | 2018-03-23 | 华南理工大学 | A kind of limited domination set model predictive control method based on the effect of double vectors |
| 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 |
| CN111277156A (en) * | 2020-03-16 | 2020-06-12 | 江苏师范大学 | Multi-level inverter FCS-MPC control method without weight factors |
| CN111682791A (en) * | 2020-06-23 | 2020-09-18 | 江苏师范大学 | Two-stage finite set model prediction control method |
| 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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Effective date of registration: 20200512 Address after: 221100 Xuzhou national security science and Technology Industrial Park, Lijiang Road, high tech Zone, Xuzhou City, Jiangsu Province Patentee after: Jiangsu Kelu Electric Co.,Ltd. Address before: 221000 Shanghai Road, Copper Mt. District, Jiangsu, No. 101, No. Patentee before: Jiangsu Normal UNIVERSITY |
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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 |