CN102624028A - Photovoltaic grid connection power generation system based on solar panel access method selector - Google Patents
Photovoltaic grid connection power generation system based on solar panel access method selector Download PDFInfo
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- CN102624028A CN102624028A CN2012100854027A CN201210085402A CN102624028A CN 102624028 A CN102624028 A CN 102624028A CN 2012100854027 A CN2012100854027 A CN 2012100854027A CN 201210085402 A CN201210085402 A CN 201210085402A CN 102624028 A CN102624028 A CN 102624028A
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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
Abstract
The invention discloses a photovoltaic grid combination power generation system based on a solar panel access method selector, which is characterized by comprising a plurality of photovoltaic grid connection power generation systems provided with independent units, the structures of the photovoltaic grid connection power generation systems are the same, each photovoltaic grid connection power generation system comprises a solar panel access method selector, a micro inverter group, a solar panel group and a coordination switch group. The solar panel access method selectors are connected with the solar panel groups, the on-off condition of the coordination switch groups are controlled by collecting output current and voltage of the solar panel groups according to the output power of the solar panel groups, so that the connection method of the solar panel groups and the micro inverter groups is controlled. The photovoltaic grid connection power generation system based on the solar panel access method selector controls the on-off condition of the coordination switch groups according to the output power of the solar panel groups, improves working range of a micro inverter photovoltaic grid connection system, and achieves optical photovoltaic energy utilization efficiency.
Description
Technical field
The present invention relates to a kind of grid-connected photovoltaic system, belong to the solar power system technical field based on solar panel access way selector.
Background technology
Solar energy, inexhaustible, renewable and clean environmental protection; The sun is shining all over the earth, ubiquitous, need not transportation, can be described as a kind of resource of not having monopolization that the global people share.Immeasurable development potentiality is arranged.Along with The development in society and economy; Effectively utilize solar energy to become decision commercial production and people's welfare life; A kind of approach very reliably that improves problem of environmental pollution can obtain huge economic benefit and social benefit, therefore also is one of various countries' renewable energy technologies of putting forth effort to develop most.
Photovoltaic generating system is to absorb sunlight through solar panel, and the luminous energy of solar energy is become electric energy output.The main flow development trend of photovoltaic generating system is a grid-connected photovoltaic power generation system.For grid-connected photovoltaic system, be mainly used in grid-connected photovoltaic system and large-scale desert photovoltaic plant that the city combines with building.
Combining inverter is the core in the photovoltaic parallel in system, and photovoltaic DC-to-AC converter is that the mode through power electronics converts direct current the module device of alternating current into, is the important tie that connects photovoltaic generation cell panel and electrical network.
Miniature inverter is the development in future direction.Centralized solar energy photovoltaic system all is made up of many solar panels that closely link to each other, and these cell panels divide into groups earlier to connect, again with the different series batteries formation array that is together in parallel.Like this, when local shade or broken gravel etc. cover photovoltaic system,, exist the problem that whole power output will significantly reduce if having because of the unequal module that causes power output to descend of sunshine inequality and characteristic.If certain battery in the series connection breaks down, also can cause whole battery group to lose efficacy.The direct current that solar panel array produces outputs to inverter.Inverter has two basic functions: the one, be completion DC/AC current conversion, and the 2nd, find out the optimal operations point to optimize the efficient of solar energy photovoltaic system.For specific solar radiation, temperature and battery types, solar energy photovoltaic system all should have unique maximum power point (mpp) mutually, makes photovoltaic system produce maximum energy.If photovoltaic system moves under non-optimum voltage and levels of current, the efficient of system can reduce, and wastes the good opportunity of gathering solar energy.
In existing little inverter technology, normally be that every solar panel is equipped with independent miniature inverter, every block assembly can carry out the conversion and the maximum power point tracking of electric current separately, does not disturb mutually.So just had the advantage that surmounts traditional large-scale centralized formula inverter; Can be optimized through power output, make whole power output maximize each module.
But miniature inverter grid-connected photovoltaic system is existing problems still, and the power output of photovoltaic generation is mainly determined by solar radiation.Solar radiation quantity is time dependent, and equipment such as miniature inverter left unused in the plenty of time.Photovoltaic generating system was not worked at night and overcast and rainy, even daytime, illumination generally changes from weak to strong by dying down by force again, if do not consider Changes in weather such as dark clouds, the power curve of photovoltaic generation every day is to be similar to the parabolic curve that Open Side Down.
On the one hand, the conversion efficiency of little inverter is relevant with input power, and littler when a lot of than little inverter rated power in input power, the conversion efficiency of little inverter begins to decline to a great extent.Therefore when input power did not reach near the rated power, though the direct current that solar panel is sent is changed, conversion efficiency was not good, has therefore wasted many electric energy yet.General inverter input power is lower than 30% o'clock of rated power, and conversion efficiency begins to descend.
On the other hand, little inverter has requirement to the be incorporated into the power networks input power of cell panel of DC side monolithic, generally speaking, less than 25W just not in the working range of little inverter.This moment, system can be in detected state, and stopped to present any energy to electrical network.Though be direct current with the Conversion of energy of solar energy this moment in the solar panel, just power is big inadequately, and not enough so that little inverter is to the electrical network feed, so this part electricity has been wasted.
Summary of the invention
Goal of the invention: to the problems and shortcomings that prior art exists, the present invention provides a kind of operating power zone of extending miniature inverter photovoltaic parallel in system, reach the grid-connected photovoltaic system based on solar panel access way selector of higher optical energy utilization efficiency.
Technical scheme: a kind of grid-connected photovoltaic system based on solar panel access way selector; The grid-connected photovoltaic system that comprises a plurality of separate units; The structure of said each grid-connected photovoltaic system is identical; Be used for converting the input of the direct current of satisfactory solar panel into the electrical network in-phase synchronization sinusoidal voltage and electric current, and directly insert electrical network;
The grid-connected photovoltaic system of said single separate unit comprises solar panel access way selector, little inverter group, solar panel group and collaborative switches set;
Said solar panel access way selector is connected with the solar panel group; Through gathering the output current and the voltage of solar panel group; Control the switch situation of said collaborative switches set according to the size of solar panel group power output, thereby control the connected mode of solar panel group with little inverter group.
Said solar panel access way selector comprises dc voltage and current testing circuit, microprocessor, drive circuit and display unit;
The dc voltage and current testing circuit is used to gather the output current and the voltage of said solar panel group, and will gather the electric current and the voltage signal that come and convert digital signal into, and said digital signal is exported to said microprocessor;
Microprocessor; Receive the digital signal that the dc voltage and current testing circuit sends over; And with digital signal of receiving and desired value comparison; When the power output of monolithic solar panel satisfies the working range of little inverter and during near rated power, microprocessor is its conversion for little inverter of each solar panel configuration, and to the electrical network feed; When the power output of monolithic solar panel less than rated power 30% the time; Microprocessor is together in parallel two solar panels; Make the power output of two cell panels obtain stack; Reach near the rated power of single little inverter, the power with stack is input in the little inverter and transforms then, and to the electrical network feed; When the stack power of two solar panels still is not enough to arrive near the rated power of single little inverter; Further with the stack of three solar panels; Still just the power of stack is input in the little inverter and transforms then, and to the electrical network feed, and the like.
When intensity of illumination changes; Through a simple microprocessor; Being electrically connected between adjustment photovoltaic array and the little inverter; The input power that makes single little inverter as far as possible in more time near rated power work, little inverter operating efficiency of avoiding causing because of input power is low descends.
Drive circuit; Receive the control signal that microprocessor transmits; And with the requirement of this control signal according to its collaborative switches set control end, convert into and be added between collaborative switches set control end and the common port, can make its signal of opening or turn-offing, send to collaborative switches set then;
Collaborative switches set receives the control switch signal from drive circuit, the disconnection of control switch and closure, thus adjust the parallel-connection structure of photovoltaic module dynamically, in the hope of reaching best photovoltaic energy utilization ratio.
Display unit is used to show each solar panel power situation of output in real time, also has the input power situation and the working condition of little inverter.
Beneficial effect: compared with prior art; Grid-connected photovoltaic system based on solar panel access way selector provided by the invention has following advantage: the switch situation of controlling collaborative switches set according to the size of solar panel group power output; Thereby control solar panel group is with the connected mode of little inverter group; Improve the working range of miniature inverter photovoltaic parallel in system, reach best photovoltaic energy utilization ratio.
Description of drawings
Fig. 1 is the frame diagram of the embodiment of the invention;
Fig. 2 is the frame diagram of the grid-connected photovoltaic system of single separate unit in the embodiment of the invention;
Fig. 3 is the structural representation of grid-connected little inverter in the embodiment of the invention;
Fig. 4 is the embodiment structure combining sketch map among Fig. 2 and Fig. 3.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment; Further illustrate the present invention; Should understand these embodiment only be used to the present invention is described and be not used in the restriction scope of the present invention; After having read the present invention, those skilled in the art all fall within the application's accompanying claims institute restricted portion to the modification of the various equivalent form of values of the present invention.
As shown in Figure 1; Grid-connected photovoltaic system in the present embodiment based on solar panel access way selector; The grid-connected photovoltaic system that comprises a plurality of separate units; The grid-connected photovoltaic system of each separate unit comprises 15 solar panels and 15 little inverters, and is each solar panel access way selector of separate unit distribution and one group of collaborative switches set.
As shown in Figure 2, the grid-connected photovoltaic system of single separate unit comprises solar panel access way selector, little inverter group, solar panel group and collaborative switches set;
The solar panel group is used to receive sunlight, and is direct current with transform light energy;
Solar panel access way selector, the connected mode of selection solar panel group and little inverter group; That is to say; Solar panel access way selector is connected with the solar panel group; Through gathering the output current and the voltage of solar panel group; Control the switch situation of said collaborative switches set according to the size of solar panel group power output, thereby control the connected mode of solar panel group with little inverter group;
Little inverter group is used for that solar cell panel assembly is passed the direct current of coming and converts the alternating current that matees with electrical network into, and this alternating current is input in the electrical network.
As shown in Figure 3, solar panel access way selector comprises: dc voltage and current testing circuit, microprocessor, drive circuit and display unit;
The dc voltage and current testing circuit is used to gather the input current and the voltage of solar panel, and will to gather the conversion of signals of coming be digital signal, and this digital signal is exported to microprocessor.
Microprocessor; As shown in Figure 4, receive the digital signal that the dc voltage and current testing circuit sends over, and digital signal of receiving and desired value are compared; Here our rated input power of setting little inverter work is about 240W, and 30% rated power is exactly 72W so; Here we select the minimum input power of little inverter work to require to be 24W, and our desired value of selection is exactly 72W, 48W, 36W, 24W, 18W, 8W so here.
When the power that detects the monoblock battery plate during greater than 72W, then break off the switch that is numbered 2k+1, closure is numbered the switch of 2k, has so just opened all little inverter passages, has closed all parallel ports.Every corresponding little inverter work of cell panel; When the power bracket that detects the monoblock battery plate when 72W～36W is interval, then close half the switch, then this moment, solar panel formed parallel connection in twos, was input to the situation of an inverter, therefore half the inverter was arranged still in work; When the power bracket that detects the monoblock battery plate when 36w～24w is interval, then close 2/3rds switch, then this moment, solar panel formed per three parallel connections, was input to the situation of an inverter, therefore 1/3rd inverter was arranged still in work; When the power bracket that detects the monoblock battery plate when 24w～18w is interval, then close 3/4ths switch, then this moment, solar panel formed per four parallel connections, was input to the situation of an inverter, therefore 1/4th inverter was arranged still in work; When the power bracket that detects the monoblock battery plate when 18w～8w is interval; Then close 4/5ths switch; Then this moment, solar panel formed per five parallel connections; Therefore be input to the situation of an inverter, 1/5th inverter arranged still in work, the power output of solar panel stack satisfies the working range of little inverter and near till the rated power.
The situation of closing of concrete switch sees the following form:
Wherein, O represents closure in the table, and X represents disconnection; K=0,1,2,3
Here set the little inverter linking number of branch road is 15, always has 30 switches, and the situation of the input power of ignoring solar panel during less than 8W, promptly realizes 5 solar panel parallel connections at most.Be about to be divided into a unit with 15, and, see shown in Figure 2 for each unit distributes a solar panel access way selector and one group of collaborative switches set based on the photovoltaic parallel in system of little inverter;
All switches are initially set to OOXOXOXOXOXX;
At common one day, morning solar energy light application ratio a little less than, the solar panel power output is during less than 8W, behind voltage and current detection circuit, underpower, switch breaks off all the time;
As time passes, illumination strengthens, when detecting the solar panel power output and increase to 8W; Switch value is changed to OOXOXOXOXX, OOXOXOXOXX, OOXOXOXOXX; This moment, 15 solar panels were divided into three groups, and per 5 is that one group of parallel connection is thanks to sent into direct current and is numbered 0,5; Little inverter of 10, the little inverter that receives input power is started working to the electrical network feed;
Along with the rising of the sun, illumination strengthens, and when testing circuit detects the solar panel power output and is 18W, switch value is changed to OOXOXOXX, OOXOXOXX, OOXOXOXX, XOXOXX.This moment, 15 solar panels were divided into two parts: 4 of preceding 12 solar panels are that one group of parallel connection is thanks to sent into direct current and is numbered 0; 4; Little inverter of 8; The little inverter that receives input power is started working to the electrical network feed, and then remaining 3 solar panels parallel connection input is numbered little inverter of 12, and the little inverter that receives input power is started working to the electrical network feed;
As time passes, illumination continue to strengthen, and when detecting the solar panel power output and increase to 24W, switch value is changed to OOXOXX; OOXOXX, OOXOXX, OOXOXX, OOXOXX; This moment, 15 solar panels were divided into five groups, and per 3 is that one group of parallel connection is thanks to sent into direct current and is numbered 0,3,6; Little inverter of 9,12, the little inverter that receives input power is started working to the electrical network feed;
As time passes, illumination continue to strengthen, and when detecting the solar panel power output and increase to 36W, switch value is changed to OOXX; OOXX, OOXX, OOXX, OOXX; OOXX, OOXX, XO this moment, 15 solar panels were divided into two parts: 2 of preceding 14 solar panels are that one group of parallel connection is thanks to sent into direct current and is numbered 0,2; 4,6,8,10; Little inverter of 12, the little inverter that receives input power is started working to the electrical network feed, and then remaining 1 solar panel input is numbered little inverter of 14, and the little inverter that receives input power is started working to the electrical network feed;
As time passes, illumination continue to strengthen, and when detecting the solar panel power output and increase to 72W, switch value is changed to OX, OX; OX, OX, OX, OX, OX; OX, OX, OX, OX, OX; OX, OX, OX, per 1 of 15 solar panels were one group and respectively direct current were fed into each little inverter separately that the little inverter that receives input power is started working to the electrical network feed this moment;
After afternoon, illumination weakens, and vice versa knows by inference.
Drive circuit; Receive the control signal that microprocessor transmits; And with the requirement of this control signal according to its collaborative switches set control end, convert into and be added between collaborative switches set control end and the common port, can make its signal of opening or turn-offing, send to collaborative switches set then;
Collaborative switches set receives the control signal from drive circuit, is used for adjusting dynamically the parallel-connection structure of photovoltaic module, to realize best photovoltaic energy utilization ratio.
Display unit is used to show each solar panel power situation of output in real time, also has the input power situation and the working condition of inverter.
Fig. 4 is the complex chart of Fig. 2 and Fig. 3; Comprehensive embodiment; The residing effect of solar panel access way selector in this photovoltaic system controlled collaborative switches set through microprocessor exactly, thereby regulates the connected mode of solar panel group and little inverter group.
Claims (3)
1. grid-connected photovoltaic system based on solar panel access way selector; It is characterized in that: the grid-connected photovoltaic system that comprises a plurality of separate units; The structure of said each grid-connected photovoltaic system is identical, includes solar panel access way selector, little inverter group, solar panel group and collaborative switches set;
Said solar panel access way selector is connected with the solar panel group; Through gathering the output current and the voltage of solar panel group; Control the switch situation of said collaborative switches set according to the size of solar panel group power output, thereby control the connected mode of solar panel group with little inverter group.
2. the grid-connected photovoltaic system based on solar panel access way selector as claimed in claim 1 is characterized in that: said solar panel access way selector comprises dc voltage and current testing circuit, microprocessor and drive circuit;
The dc voltage and current testing circuit is used to gather the output current and the voltage of said solar panel group, and will gather the electric current and the voltage signal that come and convert digital signal into, and said digital signal is exported to said microprocessor;
Microprocessor; Receive the digital signal that the dc voltage and current testing circuit sends over; And with digital signal of receiving and desired value comparison; When the power output of monolithic solar panel satisfies the working range of little inverter and during near rated power, microprocessor is its conversion for little inverter of each solar panel configuration, and to the electrical network feed; When the power output of monolithic solar panel less than rated power 30% the time; Microprocessor is together in parallel two solar panels; Make the power output of two cell panels obtain stack; Reach near the rated power of single little inverter, the power with stack is input in the little inverter and transforms then, and to the electrical network feed; When the stack power of two solar panels still is not enough to arrive near the rated power of single little inverter; Further with the stack of three solar panels; Still just the power of stack is input in the little inverter and transforms then, and to the electrical network feed, and the like;
Drive circuit; Receive the control signal that microprocessor transmits; And with the requirement of this control signal according to its collaborative switches set control end, convert into and be added between collaborative switches set control end and the common port, can make its signal of opening or turn-offing, send to collaborative switches set then;
Collaborative switches set receives the control switch signal from drive circuit, the disconnection of control switch and closure, thus adjust the parallel-connection structure of photovoltaic module dynamically.
3. the grid-connected photovoltaic system based on solar panel access way selector as claimed in claim 2; It is characterized in that: said solar panel access way selector also comprises display unit, is used to show the power situation of each solar panel output in real time, the input power situation and the working condition of little inverter.
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| CN2012100854027A CN102624028A (en) | 2012-03-28 | 2012-03-28 | Photovoltaic grid connection power generation system based on solar panel access method selector |
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| CN2012100854027A CN102624028A (en) | 2012-03-28 | 2012-03-28 | Photovoltaic grid connection power generation system based on solar panel access method selector |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114144952A (en) * | 2019-07-25 | 2022-03-04 | 智能追踪识别有限公司 | Circuit for supplying power to centrifugal pump |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2001268800A (en) * | 2000-03-16 | 2001-09-28 | Kawasaki Steel Corp | Solar light power generation control method and apparatus |
| CN201623499U (en) * | 2010-01-22 | 2010-11-03 | 扬州晶旭电源有限公司 | Solar energy inverter centralized control device with expandable function |
| CN102097821A (en) * | 2009-12-15 | 2011-06-15 | 三星Sdi株式会社 | Grid-connected energy storage system and method of controlling grid-connected energy storage system |
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- 2012-03-28 CN CN2012100854027A patent/CN102624028A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001268800A (en) * | 2000-03-16 | 2001-09-28 | Kawasaki Steel Corp | Solar light power generation control method and apparatus |
| CN102097821A (en) * | 2009-12-15 | 2011-06-15 | 三星Sdi株式会社 | Grid-connected energy storage system and method of controlling grid-connected energy storage system |
| CN201623499U (en) * | 2010-01-22 | 2010-11-03 | 扬州晶旭电源有限公司 | Solar energy inverter centralized control device with expandable function |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114144952A (en) * | 2019-07-25 | 2022-03-04 | 智能追踪识别有限公司 | Circuit for supplying power to centrifugal pump |
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Application publication date: 20120801 |