CN105244904B - A kind of stabilizing control system of grid-connected photovoltaic system - Google Patents
A kind of stabilizing control system of grid-connected photovoltaic system Download PDFInfo
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- CN105244904B CN105244904B CN201410275737.4A CN201410275737A CN105244904B CN 105244904 B CN105244904 B CN 105244904B CN 201410275737 A CN201410275737 A CN 201410275737A CN 105244904 B CN105244904 B CN 105244904B
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- battery
- buck
- stability
- grid
- reversible transducer
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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a kind of stabilizing control system of grid-connected photovoltaic system, which includes photovoltaic array, DC converter (boost chopper), stability contorting module, inverter, AC network.Stability contorting module include: voltage collector, Buck/Boost type (buck) reversible transducer, battery, Data collecting conversion module, in stability controller (CPU) and reversible transducer electronic switching device trigger unit.Control amount in the present invention state-of-charge of battery more than existing controller, it is more accurate to the virtual condition acquisition of battery, and control circuit uses Buck/Boost type (buck) reversible transducer, electronic switching device therein uses performance more preferably IGBT, these make control precision of the invention high, ensure that the stability of grid-connected photovoltaic system output.
Description
Technical field
The present invention relates to technical field of power systems, are more particularly to a kind of stability contorting system of grid-connected photovoltaic system
System.
Background technique
Sharply expansion, the worsening and human kind sustainable development of ecological environment with countries in the world to energy demand
Requirement, countries in the world all active development utilize reproducible new energy.And solar energy resources enrich, be distributed it is wide, pollution-free,
It is renewable, so that solar energy power generating becomes the mainstream in new energy development.In recent years, external grid-connected technology has been walked out
Laboratory research enters commercialization market operation mechanism.Currently, in grid-connected photovoltaic system, since photovoltaic cell is defeated
The influence of the extraneous factors such as the non-linear and illumination of characteristic and temperature out, photovoltaic generating system output stability is very poor, exists
The problem of output power and voltage fluctuation, the power quality of system can be seriously affected by being connected to the grid.
Summary of the invention
(1) technical problems to be solved
The technical problem to be solved in the present invention is to solve the problems, such as existing photovoltaic system output power and voltage fluctuation, mention
The power quality of high system provides a kind of stabilizing control system of grid-connected photovoltaic system.
(2) technical solution
In order to solve the above-mentioned technical problems, the present invention provides a kind of stabilizing control system of grid-connected photovoltaic system,
The system includes photovoltaic array, DC converter, i.e. boost chopper, stability contorting module, inverter, AC network；Photovoltaic
Array is connect by DC converter with stability contorting modular electrical, and the output of stability contorting module and inverter are electrically connected,
The output of inverter and AC network are electrically connected.
Wherein, stability contorting module include voltage collector, Buck/Boost type buck reversible transducer, battery,
The trigger unit of electronic switching device in Data collecting conversion module, stability controller (CPU) and reversible transducer；Voltage acquisition
Device is connected to the exit of boost chopper, acquires the output busbar voltage of photovoltaic system, an output end of voltage collector
It is connect with Data collecting conversion modular electrical, the side of another output and buck reversible transducer is electrically connected, two-way
The converter other side and battery are electrically connected, electric current Ib and electric power storage of the Data collecting conversion module from battery acquisition battery
The state-of-charge SOC in pond, and analog-to-digital conversion is carried out to three data of acquisition, it is then delivered in stability controller (CPU) and carries out
Processing analysis, into buck reversible transducer, the trigger unit of electronic switching device issues control signal, fills to battery
Discharge process is controlled, to stablize grid-connected photovoltaic system.
(3) beneficial effect
Control amount in the present invention state-of-charge of battery more than existing controller, adopts the virtual condition of battery
It is more accurate to collect, and control circuit uses Buck/Boost type (buck) reversible transducer, and electronic switching device therein is adopted
With performance more preferably IGBT, these make control precision of the invention high, ensure that the stabilization of grid-connected photovoltaic system output
Property.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the stabilizing control system structural schematic diagram of grid-connected photovoltaic system of the invention；
Fig. 2 is the flow chart of the stabilizing control system of grid-connected photovoltaic system of the invention；
Fig. 3 is that reversible transducer operational mode is selected in the stabilizing control system of grid-connected photovoltaic system of the invention
Flow chart；
Marked in the figure: 1 photovoltaic array, 2 DC converters, 3 voltage collectors, 4 inverters, 5 AC networks, 6 stablize control
Molding block, 7 reversible transducers, 8 batteries, 9 Data collecting conversion modules, 10 stability controllers (CPU), 11 trigger units.
Specific embodiment
Embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples.Following embodiment is used for
Illustrate the present invention, but cannot be used to limit the scope of the invention.
A kind of stabilizing control system suitable for grid-connected photovoltaic system, including photovoltaic array 1, pass through DC converter
(boost chopper) 2 is electrically connected in stability contorting module 6, and the output of stability contorting module 6 and inverter 4 are electrically connected, inverse
Become device 4 and AC network 5 is electrically connected.Stability contorting module 6 is double including voltage collector 3, Buck/Boost type (buck)
The electronic switching device into converter 7, battery 8, Data collecting conversion module 9, stability controller (CPU) 10 and reversible transducer
The trigger unit 11 of part.
Voltage collector 3 is connected to the exit of boost chopper 2, acquires the output busbar voltage of photovoltaic system, voltage
An output end and Data collecting conversion module 9 for collector 3 is electrically connected, another output and buck reversible transducer
7 side electrical connection, the other side of reversible transducer 7 and battery 8 are electrically connected, and Data collecting conversion module 9 is from electric power storage
Pond 8 acquires the electric current Ib of the battery and state-of-charge SOC of battery, and carries out analog-to-digital conversion to three data of acquisition, so
After be sent in stability controller (CPU) 10 and carry out processing analysis, the triggering of electronic switching device into buck reversible transducer 7
Unit 11 issues control signal, controls the charge and discharge process of battery, to reach stable grid-connected photovoltaic system
The purpose of output.
Control system line is connected according to the structural representation Fig. 1 provided, power supply is opened, in stability controller (CPU) 10
Three threshold values of middle setting: DC bus-bar voltage Vset, battery charging current Iset and the electric power storage tank discharge of photovoltaic system output
Limit lowest capacity SOCmin.The DC bus-bar voltage VB and storage of 9 real-time detection photovoltaic system of Data collecting conversion module output
The state-of-charge SOC and electric current Ib of battery, and carry out analog-to-digital conversion will data be sent into stability controller (CPU) 10 in analyze
Processing.Stability controller (CPU) 10 selects the operating mode of buck reversible transducer 7 first, and selection course is as shown in Figure 3.
After selected operating mode, the DC bus-bar voltage VB of actual measurement is compared with the charging current Ib of battery with setting value, difference
It is sent into PI controller, by a series of comparison, analysis and processing, obtains to electronic switch in buck reversible transducer 7
The control driving signal of device trigger unit 11 realizes effective control to accumulator charging/discharging process, to optimize photovoltaic system
The output of system.
The above embodiments are only used to illustrate the present invention, rather than limitation of the present invention.Although referring to embodiment to this hair
It is bright to be described in detail, those skilled in the art should understand that, to technical solution of the present invention carry out it is various combination,
Modification or equivalent replacement should all cover and want in right of the invention without departure from the spirit and scope of technical solution of the present invention
It asks in range.
Claims (1)
1. a kind of stabilizing control system of grid-connected photovoltaic system, which is characterized in that the system includes photovoltaic array, direct current change
Parallel operation and boost chopper, stability contorting module, inverter, AC network；Photovoltaic array is by DC converter and stablizes control
The electrical connection of molding block, the output of stability contorting module and inverter are electrically connected, and the output of inverter and AC network are electrical
Connection；
The stability contorting module includes: voltage collector, Buck/Boost type buck reversible transducer, battery, number
According to the trigger unit of electronic switching device in acquisition conversion module, stability controller CPU and reversible transducer；Voltage collector is simultaneously
It is connected to the exit of boost chopper, acquires the output busbar voltage of photovoltaic system, the output end and number of voltage collector
According to acquisition conversion module electrical connection, the side of another output and buck reversible transducer is electrically connected, two-way changing
The device other side and battery are electrically connected, and Data collecting conversion module is from the electric current Ib of battery acquisition battery and battery
State-of-charge SOC, and analog-to-digital conversion is carried out to three data of acquisition, it is then delivered in the stability controller CPU
Reason analysis, it is described carry out processing analysis include:
Three threshold values are set in the stability controller CPU: DC bus-bar voltage Vset, the battery of photovoltaic system output fill
Electric current Iset and electric power storage tank discharge limit lowest capacity SOCmin, and the stability controller CPU selects buck two-way first
The operating mode of converter, select operating mode after, by the charging current Ib of the DC bus-bar voltage VB of actual measurement and battery with
Setting value compares, and difference is sent into PI controller, by comparing, analyzes and handles, obtains control signal；
Into buck reversible transducer, the trigger unit of electronic switching device issues control signal, the charge and discharge to battery
Cheng Jinhang control, to stablize grid-connected photovoltaic system.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410275737.4A CN105244904B (en) | 2014-06-19 | 2014-06-19 | A kind of stabilizing control system of grid-connected photovoltaic system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410275737.4A CN105244904B (en) | 2014-06-19 | 2014-06-19 | A kind of stabilizing control system of grid-connected photovoltaic system |
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| CN105244904A CN105244904A (en) | 2016-01-13 |
| CN105244904B true CN105244904B (en) | 2019-01-11 |
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| CN108123484A (en) * | 2016-11-30 | 2018-06-05 | 镇江常畅光伏电子有限公司 | A kind of accumulation energy type photovoltaic grid-connected generating control system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102159003A (en) * | 2010-11-12 | 2011-08-17 | 深圳市斯派克光电科技有限公司 | Solar energy and wind energy integrated highly-intelligent control method and system |
| CN102215012A (en) * | 2011-06-07 | 2011-10-12 | 天宝电子（惠州）有限公司 | Bidirectional transformation system of solar energy and electric energy |
| CN204156534U (en) * | 2014-06-19 | 2015-02-11 | 国网山西省电力公司电力科学研究院 | A kind of stabilizing control system of grid-connected photovoltaic system |
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2014
- 2014-06-19 CN CN201410275737.4A patent/CN105244904B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102159003A (en) * | 2010-11-12 | 2011-08-17 | 深圳市斯派克光电科技有限公司 | Solar energy and wind energy integrated highly-intelligent control method and system |
| CN102215012A (en) * | 2011-06-07 | 2011-10-12 | 天宝电子（惠州）有限公司 | Bidirectional transformation system of solar energy and electric energy |
| CN204156534U (en) * | 2014-06-19 | 2015-02-11 | 国网山西省电力公司电力科学研究院 | A kind of stabilizing control system of grid-connected photovoltaic system |
Non-Patent Citations (1)
| Title |
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| 《一种独立光伏发电系统双向变换器的控制策略》;廖志凌等;《电工技术学报》;20080131;第23卷(第1期);第97-103页 |
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