CN108123490A - A kind of parallel connection of three-phase inverter system without interconnection line forecast Control Algorithm - Google Patents
A kind of parallel connection of three-phase inverter system without interconnection line forecast Control Algorithm Download PDFInfo
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- CN108123490A CN108123490A CN201611073191.XA CN201611073191A CN108123490A CN 108123490 A CN108123490 A CN 108123490A CN 201611073191 A CN201611073191 A CN 201611073191A CN 108123490 A CN108123490 A CN 108123490A
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- Prior art keywords
- control
- phase inverter
- interconnection line
- parallel
- parallel connection
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Classifications
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
-
- 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
- H02J3/003—Load forecast, e.g. methods or systems for forecasting future load demand
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a kind of parallel connection of three-phase inverter system without interconnection line forecast Control Algorithm, including three two level three-phase voltage-type inverters, droop control, PREDICTIVE CONTROL parts.The present invention is to combine inverter parallel system droop control with parallel three phase inverter PREDICTIVE CONTROL, parallel three phase inverter is constructed without interconnection line PREDICTIVE CONTROL structure, the control structure had both considered the good dynamic characteristics of shunt chopper Model Predictive Control and had been easily handled mission nonlinear characteristic and the advantage of constraint, the features such as having taken into account robustness possessed by inverter parallel system droop control, scalability and total system redundancy again realizes the optimal control effectively respectively and to each shunt chopper to parallel system bearing power.
Description
Technical field
The present invention relates to a kind of parallel connection of three-phase inverter system more particularly to a kind of parallel connection of three-phase inverter system without mutual
Line forecast Control Algorithm.
Background technology
It is so that each shunt chopper is respectively to the main purpose that it is controlled for parallel connection of three-phase inverter electric power system
System load, while the parameters such as output voltage amplitude, frequency, phase for ensureing each inverter are consistent.Droop control is in parallel inverse
Become the output power design controller of device, need not communicate between each shunt chopper, therefore with high reliability and system redundancy
The features such as.In the inverter parallel system design based on droop control, controller architecture is generally using three ring modes, i.e. electric current
Control ring, voltage control loop and power control loop, to the promotion of dynamic performance rely primarily on change droop control characteristic and
The methods of increasing transient control ring, and for the dynamic property of parallel three phase inverter itself and its switch function nonlinear characteristic
Then it is wanting in consideration.
PREDICTIVE CONTROL results from industrial stokehold, with modeling is directly perceived, dynamic response is fast and it is non-thread to be easily handled system
Property characteristic and constraint the advantages that, be applied to current transformer control field in recent years.Mainstream control method has based on limited control
Collect the current transformer system optimizing control of Model Predictive Control.The algorithm has system dynamic response is fast, optimizes performance function to set
Flexibly, the features such as system restriction is easily handled, but the big problem of method on-line calculation, switching frequency are high, and its controller design
It is excessively complicated, and the influence of switch function is not considered, the reliability of simultaneity factor also is difficult to ensure.
The content of the invention
For the traditional control method that overcomes, existing problem, the present invention propose a kind of in terms of calculation amount, reliability row
Parallel connection of three-phase inverter system without interconnection line forecast Control Algorithm.
The technical solution adopted by the present invention to solve the technical problems is：
Shunt chopper output active and reactive power is realized to its output voltage amplitude and phase controlling by droop control part,
And in this, as the reference voltage signal of shunt chopper Model Predictive Control；PREDICTIVE CONTROL part exports electricity with shunt chopper
Pressure builds the optimization performance function of Model Predictive Control to the tracking error of reference voltage, using limited domination set model prediction
Control algolithm selects optimal controlled quentity controlled variable to act on three-phase voltage-type inverter, so as to fulfill to three-phase voltage-type inverter simultaneously
Contact system without interconnection line PREDICTIVE CONTROL.Parallel connection of three-phase inverter system without interconnection line forecast Control Algorithm, including two level
Three three-phase voltage-type inverter, droop control, PREDICTIVE CONTROL parts.
The bridge circuit and LC wave filters two that the two level three-phase voltage-type inverter is made of 6 IGBT switching devices
Part forms.
The droop control is mutually tied using the root locus analysis of the small-signal modeling and controller parameter of power control loop
The mode of conjunction is realized.
The PREDICTIVE CONTROL is improved by improving shunt chopper output voltage to reference voltage tracing control performance
The control performance of parallel connection of three-phase inverter system.
The beneficial effects of the invention are as follows：Parallel connection of three-phase inverter system without interconnection line forecast Control Algorithm, be by inversion
Device parallel system droop control combines with parallel three phase inverter PREDICTIVE CONTROL, constructs parallel three phase inverter without interconnection
Line PREDICTIVE CONTROL structure, the control structure had both considered the good dynamic characteristics of shunt chopper Model Predictive Control and be easy to locate
Manage mission nonlinear characteristic and constraint advantage, and taken into account robustness possessed by inverter parallel system droop control, can
The features such as autgmentability and total system redundancy, realizes effectively dividing equally and to each shunt chopper to parallel system bearing power
Optimal control.
Description of the drawings
Two level three-phase voltage-type inverter structures of Fig. 1.
Fig. 2 PREDICTIVE CONTROL structure diagrams.
Fig. 3 is without interconnection line PREDICTIVE CONTROL structure diagram.
Specific embodiment
As shown in Figure 1, two level three-phase voltage-type inverters (2-level voltage source inverter, 2L-
VSI).T at any timek, it is defined as being combined as the switch function of three-phase voltage-type inverter,
Middle switch functionAnd SjOnly 0 or 1 two kind of value, therefore switch function combination S only has 8 kinds
Probable value is set to。
As shown in Fig. 2, the basic principle of algorithm is：First according to three-phase voltage-type inverter controlled volume x and switch function group
Close the prediction model of the relation structure three-phase voltage-type inverter of S；At the moment, combined by controlled volume with switch function
Calculate the predicted value of subsequent time controlled volume:
；
According to system performance of interest, such as system tracking error, switching loss and system restriction, predictive controller is built
Optimize performance function, wherein x is controlled volume reference value；Finally make optimization performance function f in middle selectiongIt is minimum
Switch function compound action in three-phase inverter.
As shown in figure 3, by three-phase voltage-type inverter Model Predictive Control and parallel connection of three-phase inverter system droop control
Combine, the reference voltage signal u of each shunt chopper PREDICTIVE CONTROL is provided by droop control0, then provided by PREDICTIVE CONTROL
Drive the switching signal of parallel three phase inverter.Two dotted line frames in figure represent the droop control in System control structures respectively
Part and PREDICTIVE CONTROL part.
Shunt chopper no control interconnection PREDICTIVE CONTROL structure mainly make use of predictive control algorithm in parallel three phase inverter
Advantage in output voltage tracing control performance, current inner loop-outer voltage that PREDICTIVE CONTROL is replaced to shunt chopper control,
So as to by improving shunt chopper output voltage to reference voltage u0Tracing control performance improves parallel connection of three-phase inverter system
The control performance of system.
The design of droop control device parameter is using the small-signal modeling of power control loop and the root locus point of controller parameter
Phase separation with reference to mode realize.In inverter parallel system, the control targe of system is parallel system output voltage to ginseng
Bearing power is divided equally in the tracking and each shunt chopper for examining voltage.Droop control has had ensured that the realization of above-mentioned target, and
Give the reference value u of separate unit shunt chopper output voltage tracing control0。
Claims (4)
1. a kind of parallel connection of three-phase inverter system without interconnection line forecast Control Algorithm, it is characterised in that：Including two level three-phases
Three voltage source inverter, droop control, PREDICTIVE CONTROL parts.
2. parallel connection of three-phase inverter system as described in claim 1 without interconnection line forecast Control Algorithm, it is characterised in that two
The bridge circuit and LC wave filter two parts that level three-phase voltage-type inverter is made of 6 IGBT switching devices form.
3. parallel connection of three-phase inverter system as described in claim 1 without interconnection line forecast Control Algorithm, it is characterised in that institute
State droop control be using power control loop small-signal modeling in a manner that the root locus analysis of controller parameter is combined come
It realizes.
4. parallel connection of three-phase inverter system as described in claim 1 without interconnection line forecast Control Algorithm, it is characterised in that institute
It is by improving shunt chopper output voltage to reference voltage u to state PREDICTIVE CONTROL0Tracing control performance improves three-phase inversion
The control performance of device parallel system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611073191.XA CN108123490A (en) | 2016-11-29 | 2016-11-29 | A kind of parallel connection of three-phase inverter system without interconnection line forecast Control Algorithm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611073191.XA CN108123490A (en) | 2016-11-29 | 2016-11-29 | A kind of parallel connection of three-phase inverter system without interconnection line forecast Control Algorithm |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108123490A true CN108123490A (en) | 2018-06-05 |
Family
ID=62226636
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611073191.XA Pending CN108123490A (en) | 2016-11-29 | 2016-11-29 | A kind of parallel connection of three-phase inverter system without interconnection line forecast Control Algorithm |
Country Status (1)
| Country | Link |
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| CN (1) | CN108123490A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108923465A (en) * | 2018-08-03 | 2018-11-30 | 国网福建省电力有限公司 | Mix sagging control and the voltage-controlled piconet island control method of model prediction |
| CN110855155A (en) * | 2019-12-04 | 2020-02-28 | 兰州交通大学 | Screen grid power supply control method based on model predictive control |
-
2016
- 2016-11-29 CN CN201611073191.XA patent/CN108123490A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108923465A (en) * | 2018-08-03 | 2018-11-30 | 国网福建省电力有限公司 | Mix sagging control and the voltage-controlled piconet island control method of model prediction |
| CN110855155A (en) * | 2019-12-04 | 2020-02-28 | 兰州交通大学 | Screen grid power supply control method based on model predictive control |
| CN110855155B (en) * | 2019-12-04 | 2021-06-18 | 兰州交通大学 | Screen grid power supply control method based on model predictive control |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180605 |
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| WD01 | Invention patent application deemed withdrawn after publication |