CN103904655A - Power distribution control method for distributed converter system efficiency optimization - Google Patents
Power distribution control method for distributed converter system efficiency optimization Download PDFInfo
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- CN103904655A CN103904655A CN201410109427.5A CN201410109427A CN103904655A CN 103904655 A CN103904655 A CN 103904655A CN 201410109427 A CN201410109427 A CN 201410109427A CN 103904655 A CN103904655 A CN 103904655A
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Abstract
The invention discloses a power distribution control method for distributed converter system efficiency optimization, and belongs to the technical field of renewable energy generation. According to the method, total output power in a distributed power generation system is sampled, and the power distribution proportion of each converter is dynamically adjusted according to efficiency curve data of each converter on the situation that the total output power of the system is rated. By means of the control method, efficiency of a whole distributed off-network system can be optimized without the limitation of topological structures, power and other factors of the converters. The method is suitable for being used in distributed power electronic converter off-network power generation systems with MOSFETs, IGBTs and other semiconductors as power switches.
Description
technical field
The invention discloses a kind of power distribution control method of optimizing distributed converters system effectiveness, belong to generation of electricity by new energy technical field.
background technology
In recent years, along with the rapid growth of energy demand, new forms of energy have obtained increasing concern.Because the relatively traditional fossil energy of the new forms of energy such as solar energy, wind energy, fuel cell has the features such as region disperses and energy changing is random, inconvenience realizes central energy supply, and distributed generation system can be realized distributing rationally of resource, therefore obtain paying close attention to widely.Distributed generation system has the following advantages than centralized electricity generation system: 1) in distributed generation system, each generator unit is separate, safer reliable; 2) be easy to realize localization, power transmission and distribution loss is very low; 3) be easy to monitoring, control simply, can develop to intelligent direction easily; 4) installation and maintenance are convenient, and cost is low.
Fig. 1 has provided typical distributed generation system framework, and the electric energy that converter A, B, C produce photovoltaic generation, wind power generation and batteries to store energy unit respectively and direct current or ac bus exchange.Be not connected to the grid at bus electric energy, namely, under off-grid pattern, the input power of system is determined by load power demand.Due to different converters efficiency difference under different loading conditions, therefore how to give each converter rational power division according to different loads, just become the key problem of optimization system efficiency.
Traditional power distribution method often adopts the mode of mean allocation+underloading excision combination.The system forming take three converters is as example, in the time loading in normal range (NR) (>=10%), three converter mean allocation power, in the time that load drops to below 10% but is greater than 6.67%, a wherein converter is quit work, another two mean allocation power, in the time that load continues to drop to below 6.67%, only retain a job.The method can guarantee that converter can not be operated under the state of utmost point underloading, in the time that three converters are identical, and the optimization that mean allocation power can implementation efficiency.But, in practical application, due to generating input different in kind (photovoltaic, wind energy, storage battery etc.), the topological sum rated power of converter can not be identical, under such condition, simple mean allocation power cannot make system effectiveness optimization, even can worsen efficiency in some situation.
Be optimized in order to make distributed converters system effectiveness not be subject to the restriction of converter topology, power, the present invention proposes a kind of power distribution method based on transducer effciency curve and is applied in the middle of distributed converters system.Its major advantage has: 1) at full-load range, especially under underloading condition, realize the optimization of entire system efficiency; 2) algorithm is carried out the restriction that is not subject to converter topology structure, watt level, and the scope of application is very wide; 3) expand conveniently, can add easily, reduce system inner conversion device quantity, be easy to safeguard and upgrading; 4) adopt and concentrate-distribute the Digital Control structure combining, without too much ancillary hardware.
summary of the invention
The present invention is directed to defect of the prior art and deficiency, a kind of power distribution control method of optimizing distributed converters system effectiveness has been proposed, it is applicable to distributed power generation occasion, can improve at full-load range the operating efficiency of entire system, be not subject in system concrete converter topology structure, restriction that watt level is different, have simultaneously simple in structure, expand the advantages such as convenient.
The present invention adopts following technical scheme for solving its technical problem:
A power distribution control method of optimizing distributed converters system effectiveness, comprises the steps:
1) the efficiency curve information of self is sent to central controller by the controller of converter;
2) central controller carries out analytical calculation according to the transducer effciency information in existing system, thereby acquisition system from minimum power within the scope of rated power, each inverter power distribution condition of each power points, and distribution numerical value is deposited in data distribution list;
3), when system is started working, central controller is by power detecting unit real-time monitoring system total load power;
4) gross power that central controller detects power detecting unit is brought step 2 into) in the allocation table of storage, obtain the power division numerical value of each converter under this performance number;
5) central controller passes to power division situation by wireless mode the controller of each converter, and converter is according to distribution condition work.
Beneficial effect of the present invention is as follows:
1, the present invention can promote at full-load range the whole efficiency of distributed generation system, realizes the control of system effectiveness optimization.
2, the present invention is applied widely, is not subject to the effects limit such as converter topology structure, watt level.
3, autgmentability of the present invention is strong, can add easily, reduce system inner conversion device quantity and without change control algolithm, simple to operate, maintenance cost is low.
4, the present invention adopts concentrated---and the Digital Control structure that distributes and combine, without too much ancillary hardware, framework is simple.
5, the present invention uses wireless technology to communicate, and has reduced the laying of circuit, and convenient and reasonable optimization usage space contributes to realize intelligent control and interconnected networking.
accompanying drawing explanation
Fig. 1 is typical distributed generation system framework.
Fig. 2 is system construction drawing of the present invention.
Fig. 3 is the control flow chart of central controller in the present invention.
Fig. 4 is the algorithm flow chart that the present invention calculates optimal power allocation.
Fig. 5 is the efficiency curve diagram of three converters in design example of the present invention.
Fig. 6 is that the each inverter power of the present invention is distributed and system gross output graph of a relation.
Fig. 7 is the efficiency comparison diagram of control method of the present invention and traditional mean allocation method.
embodiment
Below in conjunction with accompanying drawing, the invention is described in further details.
Fig. 2 has provided the power division control system structure chart of optimizing distributed converters system effectiveness.The converter that system contains different topology and power grade, a central controller and a power measurement unit.Central controller is monitored bus to obtain system gross output by power measurement unit, the tables of data that contrast calculates in advance, and each converter carries out power stage according to the distribution of central controller.
Fig. 3 has provided the control flow of this invention central controller: 1), in the time having in new converter connecting system, the efficiency curve information of self is sent to central controller by converter controller; 2) central controller carries out analytical calculation according to the transducer effciency information in existing system, thereby acquisition system from minimum power within the scope of rated power, each inverter power distribution condition of each power points, and distribution numerical value is deposited in data distribution list; 3), when system is started working, central controller is by power detecting unit real-time monitoring system total load power; 4) gross power that central controller detects power detecting unit brings 2 into) in the allocation table of storage, obtain the power division numerical value of each converter under this performance number; 5) central controller passes to power division situation by wireless mode the independent control of each converter, and converter is according to distribution condition work.
Fig. 4 has provided the algorithm flow of central controller in gamut calculating optimal power allocation:
for the required gross output of system,
for the minimum gross output of system permission,
for all converters are all operated in the system rated output power under full load condition;
...,
for
nthe power output that platform converter is assigned to separately,
for the minimum output power of each converter permission,
for the rated output power of each converter.Meet:
1) get
,
...,
for meeting the minimum value of inverter power scope separately.2) if now
also within allowed band, according to the efficiency function of each transducer effciency Curves matching
, the overall efficiency of computing system under this distributive condition:
3) will
with
compare, if
, order
,
...,
. 4) order
, repetitive cycling, until
. 5) order
, repetitive cycling by that analogy, until
. now can obtain in gross power
punder optimum efficiency
and each inverter power apportioning cost
...,
, deposited in tables of data.6) order
p=
p+ 1, repetitive cycling storage, until
, so far obtain the optimal power allocation of gamut power output, calculate and finish.
The power distribution control method design example of optimization distributed converters entire system efficiency of the present invention is as follows: system contains 3 converter A, B, C altogether, and their rated power is separately respectively
=100W,
=200W,
=250W, allows output minimum power to be 10% of rated power separately, and Fig. 5 has provided the efficiency curve of three converters.According to efficiency curve, can matching obtain their efficiency curve functions separately:
Fig. 6 has provided the each inverter power obtaining afterwards as calculated under above-mentioned design example and has distributed and system gross output graph of a relation.Scheme thus knownly, in the time that system gross output changes, the power that each converter distributes also can change thereupon, and optimum efficiency not obtains under the condition of three converter mean allocation power.For example, in the time of gross output P=300W, the power that can be obtained three converters distribution by figure is respectively:
In the time of gross output P=550W, three converters are all operated in full load condition.
Fig. 7 has provided the efficiency comparison diagram of control method of the present invention and traditional mean allocation method under above-mentioned design example, by can obviously seeing in figure, in full-load range, system effectiveness all can remain on more than 93%, compare with traditional control method, control method of the present invention can be in gamut the operating efficiency of elevator system entirety, and in the situation that load is lighter, promote effect especially obvious, efficiency is than using conventional method to exceed more than 8%.Thereby this result verification before the correctness of theory analysis.Control method of the present invention can promote the whole efficiency of distributed converters electricity generation system.
In sum, the power distribution control method of optimization distributed converters system effectiveness of the present invention is applicable to distributed power generation occasion, can improve at full-load range the operating efficiency of entire system, be not subject in system concrete converter topology structure, restriction that watt level is different, have simultaneously simple in structure, expand the advantages such as convenient, there is the not available advantage of existing control method.
Above embodiment only, for explanation technological thought of the present invention, can not limit protection scope of the present invention with this, every technological thought proposing according to the present invention, and any change of doing on technical scheme basis, within all falling into protection range of the present invention.
Claims (1)
1. a power distribution control method of optimizing distributed converters system effectiveness, is characterized in that, comprises the steps:
1) the efficiency curve information of self is sent to central controller by the controller of converter;
2) central controller carries out analytical calculation according to the transducer effciency information in existing system, thereby acquisition system from minimum power within the scope of rated power, each inverter power distribution condition of each power points, and distribution numerical value is deposited in data distribution list;
3), when system is started working, central controller is by power detecting unit real-time monitoring system total load power;
4) gross power that central controller detects power detecting unit is brought step 2 into) in the allocation table of storage, obtain the power division numerical value of each converter under this performance number;
5) central controller passes to power division situation by wireless mode the controller of each converter, and converter is according to distribution condition work.
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| CN201410109427.5A CN103904655B (en) | 2014-03-24 | 2014-03-24 | A kind of power distribution control method of Optimum distribution formula changer system efficiency |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109950894A (en) * | 2019-03-29 | 2019-06-28 | 电子科技大学 | A kind of DC micro power grid system and its hierarchical control method based on consistency algorithm |
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| CN103269157A (en) * | 2013-05-09 | 2013-08-28 | 燕山大学 | Bi-directional dual-input SEPIC direct-current converter and power distribution method thereof |
| CN103401419A (en) * | 2013-06-21 | 2013-11-20 | 燕山大学 | Bidirectional double-input BUCK/BUCKBOOST dc converter and power distribution method thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103269157A (en) * | 2013-05-09 | 2013-08-28 | 燕山大学 | Bi-directional dual-input SEPIC direct-current converter and power distribution method thereof |
| CN103401419A (en) * | 2013-06-21 | 2013-11-20 | 燕山大学 | Bidirectional double-input BUCK/BUCKBOOST dc converter and power distribution method thereof |
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| 孙瑾: "含分布式电源和储能装置的微电网控制技术研究", 《中国优秀硕士学位论文全文数据库》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109950894A (en) * | 2019-03-29 | 2019-06-28 | 电子科技大学 | A kind of DC micro power grid system and its hierarchical control method based on consistency algorithm |
| CN109950894B (en) * | 2019-03-29 | 2023-01-10 | 电子科技大学 | Direct-current micro-grid system and hierarchical control method thereof based on consistency algorithm |
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