CN105226939A - A kind of synchronous rectification system and control method improving solar energy power generating efficiency - Google Patents
A kind of synchronous rectification system and control method improving solar energy power generating efficiency Download PDFInfo
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- CN105226939A CN105226939A CN201510600212.8A CN201510600212A CN105226939A CN 105226939 A CN105226939 A CN 105226939A CN 201510600212 A CN201510600212 A CN 201510600212A CN 105226939 A CN105226939 A CN 105226939A
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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
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- 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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Abstract
The invention discloses a kind of synchronous rectificating device improving solar energy power generating efficiency, be applied to every block photovoltaic battery panel, MPPT maximum power point tracking (i.e. MPPT) is carried out to every block photovoltaic battery panel, substantially increase generating efficiency that is centralized or group string data photovoltaic plant, extend the cell panel life-span simultaneously, make synchronous rectificating device overall transformation efficiency high; Also disclose a kind of synchronous rectification control method on this basis, not only realize monolithic photovoltaic battery panel MPPT and control, and optimize the output voltage of synchronous rectificating device, make the overall efficiency of solar photovoltaic generation system higher.
Description
Technical field
The present invention relates to solar energy power generating field, specifically a kind of synchronous rectification system and control method of synchronous rectificating device and raising solar energy power generating efficiency.
Background technology
The energy is the important substance basis that the mankind depend on for existence and development, is also the key factor affecting national security.Traditional fossil energy belongs to non-renewable energy resources, is faced with exhausted danger.On the other hand, due to combustion of fossil fuels, cause serious pollution to air.
In order to solve this significant problem of energy supply, global every country all accelerates the exploitation to new forms of energy.Solar energy, as a kind of clean energy resource, has following feature: the first, inexhaustible.The second, be easy to obtain, ubiquity.3rd, clean, pollution-free.
The exploitation of solar energy are the effective ways solving the problems such as energy shortage that traditional fossil energy brings, environmental pollution and greenhouse effect, are the desirable alternative energy sources of human development.The utilization of solar energy mainly comprises solar thermal utilization (solar water heater etc. on the generating of heating power, roof), solar power generation, photochemical utilization etc.Photovoltaic generation by remote villages and special applications to the future development generated electricity by way of merging two or more grid systems and power with Integration of building, photovoltaic generation by the supplementary energy to alternative energy source transition.
China's photovoltaic generation industry is started in 20 century 70s, and enter stable development period in the mid-90, solar cell and module production increase year by year, has leapt to the whole world first at present.
Under the stimulation of a series of preferential policy of country, China's theCourse of PV Industry is rapid, and China's photovoltaic generation installed capacity end of the year in 2012 is accumulative reaches 7,000,000 kilowatts, and the end of the year in 2013 reaches 1,716 ten thousand kilowatts, within 2014, reaches 2,805 ten thousand kilowatts.
China's photovoltaic generation is mainly based on large-scale photovoltaic power station, and the centralized photovoltaic DC-to-AC converter of employing or group string data photovoltaic DC-to-AC converter, the problem that ubiquity cell panel efficiency is low, simultaneously because hot spot effect causes cell panel low for useful life.
Summary of the invention
For the problems referred to above, the object of this invention is to provide a kind of synchronous rectification and the control method that improve solar energy power generating efficiency, greatly can improve the efficiency of photovoltaic plant, extend the useful life of photovoltaic battery panel simultaneously, promote the sound development of China's photovoltaic generation cause.
Technical solution of the present invention is as follows:
A kind of synchronous rectificating device, its feature is, comprises reactor, the first power switch pipe, the second power switch pipe, input filter capacitor, output filter capacitor, direct current voltage sensor, DC current sensor and control unit;
One end of described reactor is connected with the anode of described output filter capacitor, and the other end of described reactor is connected with the tie point of the second power switch pipe with described first power switch pipe;
One end of described first power switch pipe is connected with the tie point of described reactor with the second power switch pipe, and the other end of this power switch pipe is connected with the negative terminal of described input filter capacitor and the negative terminal of described output filter capacitor respectively;
One end of described second power switch pipe is connected with the input of described direct current voltage sensor and the anode of described input filter capacitor respectively, and the other end of described power switch pipe is connected with the tie point of described reactor with the first power switch pipe;
The output of described direct current voltage sensor is connected with the input direct voltage signal end of described control unit;
The input of described DC current sensor is connected with the negative terminal of described input filter capacitor, and the output of this DC current sensor is connected with the input direct-current electric current signal end of described control unit;
Two power output switch controlled signal ends of described control unit are connected with the input control signal end of the first described power switch pipe input control signal end and the second power switch pipe respectively.
A kind of synchronous rectificating device, its feature is, comprises reactor, the first power switch pipe, the second power switch pipe, input filter capacitor, output filter capacitor, direct current voltage sensor, DC current sensor and control unit;
One end of described second power switch pipe is connected with the anode of described output filter capacitor, and the other end of described second power switch pipe is connected with the tie point of reactor with described first power switch pipe;
One end of described first power switch pipe is connected with the tie point of described reactor with the second power switch pipe, and the other end of this power switch pipe is connected with the negative terminal of described input filter capacitor and the negative terminal of described output filter capacitor respectively;
One end of described reactor is connected with the input of described direct current voltage sensor and the anode of described input filter capacitor respectively, and the other end of described reactor is connected with the tie point of the first power switch pipe with the second power switch pipe;
The output of described direct current voltage sensor is connected with the input direct voltage signal end of described control unit;
The input of described DC current sensor is connected with the negative terminal of described input filter capacitor, and the output of this DC current sensor is connected with the input direct-current electric current signal end of described control unit;
Two power output switch controlled signal ends of described control unit are connected with the input control signal end of the first described power switch pipe input control signal end and the second power switch pipe respectively.
Described first power switch pipe and the second power switch pipe are MOSFET/IGBT.
Improve a synchronous rectification system for solar energy power generating efficiency, its feature is, comprises multiple described synchronous rectificating device, multiple photovoltaic battery panel and photovoltaic DC-to-AC converter;
The input of each synchronous rectificating device is connected with the output of photovoltaic battery panel, and the output of this synchronous rectificating device is connected with photovoltaic DC-to-AC converter direct-flow input end, and this photovoltaic DC-to-AC converter DC output end gets access to grid.
Improve a synchronous rectification control method for solar energy power generating efficiency, it is characterized in that, comprise the steps:
Step 1, initial value: setting reactive power set-point D, photovoltaic DC-to-AC converter DC input voitage lower limit U
dCmin; Photovoltaic DC-to-AC converter DC input voitage higher limit U
dCmax;
Measure photovoltaic battery panel output voltage U
pV, photovoltaic battery panel output current I
pV, calculate photovoltaic battery panel power output P
pV;
The duty ratio initial value D of step 2, given described first power switch pipe, the duty ratio initial value of described second power switch pipe is 1-D, makes synchronous rectification control to start working, in conjunction with circuit of synchronous rectification loss, calculates circuit of synchronous rectification power output P
oUT, formula is as follows:
Max:P
OUT＝{P
PV-[D×P
loss1+(1-D)×P
loss2+P
L)]}
Constraints: U
dCmin≤ (D × U
pV)≤U
dCmax;
Wherein: P
loss1for loss when described first power switch pipe (3) duty ratio is 1, P
loss2for loss when described second power switch pipe (4) duty ratio is 1, P
lfor the loss of described reactor (2), U
dCminfor photovoltaic DC-to-AC converter DC input voitage lower limit, U
dCmaxfor photovoltaic DC-to-AC converter DC input voitage higher limit;
Step 3, output pulse width modulation (PWM)=D,
Compared with prior art, feature of the present invention is as follows:
1. pair every block photovoltaic battery panel carries out MPPT control, substantially increases the efficiency of photovoltaic plant;
2. solve photovoltaic battery panel hot spot problem, extend the cell panel life-span;
3. low cost.
Accompanying drawing explanation
Fig. 1 is a kind of synchronous rectification system diagram improving solar energy power generating efficiency of the present invention.
Fig. 2 is the synchronous rectificating device block diagram of a kind of raising solar energy power generating efficiency based on buck of the present invention.
Fig. 3 is the synchronous rectificating device block diagram of a kind of raising solar energy power generating efficiency based on boost of the present invention.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the invention will be further described, but should not limit the scope of the invention with this.
Please first consult Fig. 2, Fig. 2 is the synchronous rectificating device block diagram of a kind of raising solar energy power generating efficiency based on buck of the present invention.As shown in the figure, a kind of synchronous rectificating device, comprises reactor 2, first power switch pipe 3, second power switch pipe 4, input filter capacitor 5, output filter capacitor 6, direct current voltage sensor 7, DC current sensor 8 and control unit 9;
One end of described reactor 2 is connected with the anode of described output filter capacitor 6, and the other end of described reactor 2 is connected with the tie point of the second power switch pipe 4 with described first power switch pipe 3;
One end of described first power switch pipe 3 is connected with the tie point of described reactor 2 with the second power switch pipe 4, and the other end of this power switch pipe 3 is connected with the negative terminal of described input filter capacitor 5 and the negative terminal of described output filter capacitor 6 respectively;
One end of described second power switch pipe 4 is connected with the input of described direct current voltage sensor 7 and the anode of described input filter capacitor 5 respectively, and the other end of described power switch pipe 4 is connected with the tie point of described reactor 2 with the first power switch pipe 3;
The output of described direct current voltage sensor 7 is connected with the input direct voltage signal end of described control unit 9;
The input of described DC current sensor 8 is connected with the negative terminal of described input filter capacitor 5, and the output of this DC current sensor 8 is connected with the input direct-current electric current signal end of described control unit 9;
Two power output switch controlled signal ends of described control unit 9 are connected with the input control signal end of the first described power switch pipe 3 input control signal end and the second power switch pipe 4 respectively.
Fig. 3 is the synchronous rectificating device block diagram of a kind of raising solar energy power generating efficiency based on boost of the present invention.As shown in the figure, a kind of synchronous rectificating device, comprises reactor 2, first power switch pipe 3, second power switch pipe 4, input filter capacitor 5, output filter capacitor 6, direct current voltage sensor 7, DC current sensor 8 and control unit 9;
One end of described second power switch pipe 4 is connected with the anode of described output filter capacitor 6, and the other end of described second power switch pipe 4 is connected with the tie point of reactor 2 with described first power switch pipe 3;
One end of described first power switch pipe 3 is connected with the tie point of described reactor 2 with the second power switch pipe 4, and the other end of this power switch pipe 3 is connected with the negative terminal of described input filter capacitor 5 and the negative terminal of described output filter capacitor 6 respectively;
One end of described reactor 2 is connected with the input of described direct current voltage sensor 7 and the anode of described input filter capacitor 5 respectively, and the other end of described reactor 2 is connected with the tie point of the first power switch pipe 3 with the second power switch pipe 4;
The output of described direct current voltage sensor 7 is connected with the input direct voltage signal end of described control unit 9;
The input of described DC current sensor 8 is connected with the negative terminal of described input filter capacitor 5, and the output of this DC current sensor 8 is connected with the input direct-current electric current signal end of described control unit 9;
Two power output switch controlled signal ends of described control unit 9 are connected with the input control signal end of the first described power switch pipe 3 input control signal end and the second power switch pipe 4 respectively.
Fig. 1 is a kind of synchronous rectification system diagram improving solar energy power generating efficiency of the present invention, as shown in the figure, synchronous rectificating device 1 is applied to photovoltaic plant, every block photovoltaic battery panel exports and is connected with the input of this device, then the output of n synchronous rectificating device 1 is composed in series 1 string, k goes here and there after mutual parallel connection and is connected with the input of photovoltaic DC-to-AC converter, every block photovoltaic battery panel adopts 1 tunnel MPPT maximum power point tracking (maximumpowerpointtracking, thus realize the maximum power output of every block photovoltaic battery panel MPPT).
The present invention is applied to centralized or group string data photovoltaic plant, and on photovoltaic DC-to-AC converter without any impact, application is convenient, significant.
Claims (5)
1. a synchronous rectificating device, it is characterized in that, comprise reactor (2), the first power switch pipe (3), the second power switch pipe (4), input filter capacitor (5), output filter capacitor (6), direct current voltage sensor (7), DC current sensor (8) and control unit (9);
One end of described reactor (2) is connected with the anode of described output filter capacitor (6), and the other end of described reactor (2) is connected with the tie point of the second power switch pipe (4) with described first power switch pipe (3);
One end of described first power switch pipe (3) is connected with the tie point of described reactor (2) with the second power switch pipe (4), and the other end of this power switch pipe (3) is connected with the negative terminal of described input filter capacitor (5) and the negative terminal of described output filter capacitor (6) respectively;
One end of described second power switch pipe (4) is connected with the input of described direct current voltage sensor (7) and the anode of described input filter capacitor (5) respectively, and the other end of described power switch pipe (4) is connected with the tie point of described reactor (2) with the first power switch pipe (3);
The output of described direct current voltage sensor (7) is connected with the input direct voltage signal end of described control unit (9);
The input of described DC current sensor (8) is connected with the negative terminal of described input filter capacitor (5), and the output of this DC current sensor (8) is connected with the input direct-current electric current signal end of described control unit (9);
Two power output switch controlled signal ends of described control unit (9) are connected with the input control signal end of described the first power switch pipe (3) input control signal end and the second power switch pipe (4) respectively.
2. a synchronous rectificating device, it is characterized in that, comprise reactor (2), the first power switch pipe (3), the second power switch pipe (4), input filter capacitor (5), output filter capacitor (6), direct current voltage sensor (7), DC current sensor (8) and control unit (9);
One end of described second power switch pipe (4) is connected with the anode of described output filter capacitor (6), and the other end of described second power switch pipe (4) is connected with the tie point of reactor (2) with described first power switch pipe (3);
One end of described first power switch pipe (3) is connected with the tie point of described reactor (2) with the second power switch pipe (4), and the other end of this power switch pipe (3) is connected with the negative terminal of described input filter capacitor (5) and the negative terminal of described output filter capacitor (6) respectively;
One end of described reactor (2) is connected with the input of described direct current voltage sensor (7) and the anode of described input filter capacitor (5) respectively, and the other end of described reactor (2) is connected with the tie point of the first power switch pipe (3) with the second power switch pipe (4);
The output of described direct current voltage sensor (7) is connected with the input direct voltage signal end of described control unit (9);
The input of described DC current sensor (8) is connected with the negative terminal of described input filter capacitor (5), and the output of this DC current sensor (8) is connected with the input direct-current electric current signal end of described control unit (9);
Two power output switch controlled signal ends of described control unit (9) are connected with the input control signal end of described the first power switch pipe (3) input control signal end and the second power switch pipe (4) respectively.
3. synchronous rectificating device according to claim 1 and 2, is characterized in that, described first power switch pipe (3) and the second power switch pipe (4) are MOSFET/IGBT.
4. improve a synchronous rectification system for solar energy power generating efficiency, it is characterized in that, comprise the synchronous rectificating device (1) described in multiple claim 1 or 2, multiple photovoltaic battery panel and photovoltaic DC-to-AC converter;
The input of each synchronous rectificating device (1) is connected with the output of photovoltaic battery panel, and the output of this synchronous rectificating device (1) is connected with photovoltaic DC-to-AC converter direct-flow input end, and this photovoltaic DC-to-AC converter DC output end gets access to grid.
5. improve a synchronous rectification control method for solar energy power generating efficiency, it is characterized in that, comprise the steps:
Step 1, initial value: setting reactive power set-point D, photovoltaic DC-to-AC converter DC input voitage lower limit U
dCmin; Photovoltaic DC-to-AC converter DC input voitage higher limit U
dCmax;
Measure photovoltaic battery panel output voltage U
pV, photovoltaic battery panel output current I
pV, calculate photovoltaic battery panel power output P
pV;
The duty ratio initial value D of step 2, given described first power switch pipe (3), the duty ratio initial value of described second power switch pipe (4) is 1-D, make synchronous rectification control to start working, in conjunction with circuit of synchronous rectification loss, calculate circuit of synchronous rectification power output P
oUT, formula is as follows:
Max:P
OUT＝{P
PV-[D×P
loss1+(1-D)×P
loss2+P
L)]}
Constraints: U
dCmin≤ (D × U
pV)≤U
dCmax;
Wherein: P
loss1for loss when described first power switch pipe (3) duty ratio is 1, P
loss2for loss when described second power switch pipe (4) duty ratio is 1, P
lfor the loss of described reactor (2), U
dCminfor photovoltaic DC-to-AC converter DC input voitage lower limit, U
dCmaxfor photovoltaic DC-to-AC converter DC input voitage higher limit;
Step 3, output pulse width are modulated
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107544609A (en) * | 2016-06-23 | 2018-01-05 | 丰田自动车株式会社 | Device of solar generating |
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2015
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103515974A (en) * | 2012-06-28 | 2014-01-15 | 周德佳 | High-efficiency stable photovoltaic single-phase grid connected control method with double MPPT functions |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107544609A (en) * | 2016-06-23 | 2018-01-05 | 丰田自动车株式会社 | Device of solar generating |
| CN107544609B (en) * | 2016-06-23 | 2019-05-03 | 丰田自动车株式会社 | Device of solar generating |
| US10326271B2 (en) | 2016-06-23 | 2019-06-18 | Toyota Jidosha Kabushiki Kaisha | Solar power generation system |
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Application publication date: 20160106 |