CN103036247A - Device and method for preventing inverse power in grid-connected photovoltaic power supply - Google Patents
Device and method for preventing inverse power in grid-connected photovoltaic power supply Download PDFInfo
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- CN103036247A CN103036247A CN2011103015927A CN201110301592A CN103036247A CN 103036247 A CN103036247 A CN 103036247A CN 2011103015927 A CN2011103015927 A CN 2011103015927A CN 201110301592 A CN201110301592 A CN 201110301592A CN 103036247 A CN103036247 A CN 103036247A
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Abstract
The invention discloses a device for preventing inverse power in grid-connected photovoltaic power supply. The device for preventing inverse power in grid-connected photovoltaic power supply comprises a load power acquisition module, a switch module, a photovoltaic power battery pack, and a grid-connected control module. The load power acquisition module is used for monitoring power value of a circuit load in real time. The grid-connected control module and the load power acquisition module are in electric connection. Auxiliary battery unit combination array of the photovoltaic power battery pack connected with alternating current network in a parallel mode is determined according to the power value in real time obtained from the load power acquisition module, wherein the power supply of the photovoltaic power battery is less than the power value in real time. The switch module and the grid-connected control module are in electric connection. The turn-on and turn-off of the photovoltaic power battery pack are realized by the switch module which is controlled by the grid-connected control module. The invention further provides a method for preventing inverse power in grid-connected photovoltaic power supply. Problem of inverse power exiting in the prior technical field of photovoltaic power supply is solved, and safety of grid-connected photovoltaic power supply is ensured.
Description
Technical field
This practical photovoltaic power generation grid-connecting power supply technique field especially relates to the anti-reverse merit apparatus and method of a kind of parallel net type photovoltaic power supply.
Background technology
Photovoltaic power supply is current hot spot technology, different from the supply power mode of existing alternative electric generation supply network, present stage is replenishing as Alternating Current Power Supply generally, the power supply technique but photovoltaic power supply equipment is incorporated into the power networks is because amount of power supply is generally the constant power value, in case total power of certain all load consumption of period is compared less than the performance number of photovoltaic power supply supply of equipment, to cause to the AC network that is incorporated into the power networks pouring in down a chimney of electric current so, form the contrary merit of electric current, thereby may damage the power supply unit in the AC network.
At present existing anti-reverse merit device is by at any time voltage and the electric current of monitoring network side, in case find can reduce output current by the Communication Control inverter immediately to electrical network input energy, reduce the photovoltaic system generated output; When communication failure or other system fault occurring, the counterflow-preventing controller can be controlled output contactor and disconnect, thereby thoroughly stops to mains supply.The scheme of comparative maturity substantially all is the inverse probability problem for the large-sized photovoltaic power supply engineering at present, generated output is between 10kW-1MW, along with photovoltaic power supply is accepted by popular gradually, city photovoltaic engineering is the low profile photovoltaic power supply engineering mostly, and the present anti-reverse merit scheme that does not also have the low profile photovoltaic power supply engineering, especially for the anti-reverse merit device of the individual event electricity consumption of low profile photovoltaic power supply engineering.
Summary of the invention
The embodiment of the invention provides a kind of parallel net type photovoltaic power supply anti-reverse merit device, in order to solve the contrary merit problem that exists in photovoltaic power supply and AC network and the network process.
The embodiment of the invention provides a kind of parallel net type photovoltaic power supply anti-reverse merit device, comprises the bearing power acquisition module, switch module, and the photovoltaic power supply battery pack, the control module that is incorporated into the power networks, described bearing power acquisition module is used for observation circuit load realtime power value; The described control module that is incorporated into the power networks is electrically connected with described bearing power acquisition module, utilize described realtime power value that described bearing power acquisition module obtains to determine the wattage of the photovoltaic power supply battery pack that need to be connected in parallel with AC network, and total wattage of the photovoltaic power supply battery that is connected in parallel is less than described realtime power value; Described switch module is electrically connected with the described control module that is incorporated into the power networks, and controlled by the described control module that is incorporated into the power networks, and realizes conducting and the cut-off of photovoltaic power supply battery pack.
Design of the present invention is: connect the Real-Time Monitoring module at load end, control the photovoltaic power supply electric weight in photovoltaic power supply end access control module, built bridge by the control module that is incorporated into the power networks between the two.The bearing power acquisition module gathers load information and sends into the control module that is incorporated into the power networks, and the control module that is incorporated into the power networks is sent into switch module by the analyzing and processing of information is obtained a result, and switch module is according to receiving to such an extent that consequential signal is realized the break-make of photovoltaic power supply battery pack is controlled.Thereby by the Real Time Monitoring to load, reach the purpose to the control of battery pack break-make, thereby the control photovoltaic power supply is forever less than loading demand.
In brief, key element of the present invention is: 1, for the Real-Time Monitoring of load; 2, to the analyzing and processing of load information; 3, to the control of photovoltaic power supply battery pack break-make.
The invention provides the anti-reverse merit device of a kind of parallel net type photovoltaic power supply, the anti-reverse merit device of a kind of parallel net type photovoltaic power supply, comprise bearing power acquisition module (101), switch module (102), the control module that is incorporated into the power networks (103), photovoltaic power supply battery pack (104), it is characterized in that: photovoltaic power supply battery pack (104) is divided into many group photovoltaic power supply battery subelements, by conducting or the cut-off of each photovoltaic power supply battery subelement are controlled, make up different photovoltaic power supply battery subelement combination arrays, and then by the different photovoltaic power supply battery subelement combination array of conducting, so that described photovoltaic power supply battery pack (104) can provide a series of different output power values; Described bearing power acquisition module (101) is used for the realtime power value of Real-Time Monitoring circuit load (106), and the realtime power value that monitors is directly fed back to the control module that is incorporated into the power networks (103); The described control module that is incorporated into the power networks (103) is electrically connected with described bearing power acquisition module (101), receive the realtime power value of bearing power acquisition module (101) feedback, utilize the resulting described realtime power value of described bearing power acquisition module (101) monitoring to determine the performance number of the photovoltaic power supply battery pack (104) that need to be connected in parallel with AC network, and then need to determine the photovoltaic power supply battery subelement combination array of conducting; Described switch module (102) is electrically connected with photovoltaic power supply battery pack (104), circuit load (106) and the control module that is incorporated into the power networks (103), be subjected to the control of the described control module that is incorporated into the power networks (103), by controlling conducting and the cut-off of different different photovoltaic power supply battery subelement combination arrays, the performance number that control photovoltaic power supply battery pack (104) is incorporated into the power networks and powers.
According to a preferred embodiment of the invention, the wherein said control module that is incorporated into the power networks (103) determines that the performance number of the photovoltaic power supply battery pack (104) that need to be connected in parallel with AC network comprises: under the prerequisite of power supply gross power less than the described realtime power value that monitors that guarantees photovoltaic power supply battery pack (104), calculate and the immediate output power value of the described realtime power value that monitors, as the performance number of the photovoltaic power supply battery pack (104) that need to be connected in parallel with AC network.
According to a preferred embodiment of the invention, application switch module (102) is controlled every group of photovoltaic power supply battery subelement, described switch module comprises the variable connector subelement that links to each other with each group photovoltaic power supply battery subelement, each switch subelement of described switch module is determined conducting and the cut-off of each way switch subelement by the described control module that is incorporated into the power networks (103) control.
According to a preferred embodiment of the invention, each is organized photovoltaic power supply battery subelement and is series battery, and its power is by the photovoltaic power supply battery number of separately series connection and the output power decision of photovoltaic power supply battery, and each organizes between the photovoltaic power supply battery subelement in parallel.
According to a preferred embodiment of the invention, the described control module that is incorporated into the power networks (103) is to use the single-chip microcomputer of input control program, photovoltaic power supply battery pack (104) is controlled, thereby the photovoltaic power supply battery subelement combination array of conducting is wanted in decision.
According to a preferred embodiment of the invention, also comprise digital display tube or light-emitting diode, the photovoltaic power supply battery subelement combination array pie graph of conducting is shown in real time.
According to a preferred embodiment of the invention, also comprise photovoltaic power supply power display module, be used for photovoltaic power supply power is shown in real time.
According to a preferred embodiment of the invention, the display device of described photovoltaic power supply power display module comprises indicator light, in charactron or the liquid crystal display screen any one.
According to a preferred embodiment of the invention, described switch module is the solid-state relay control circuit, by solid-state relay conducting or the cut-off of each photovoltaic power supply battery subelement is controlled, thereby is made up different photovoltaic power supply battery subelement combination arrays.
The present invention also provides a kind of parallel net type photovoltaic power supply anti-reverse merit method, it is characterized in that comprising: photovoltaic power supply battery pack (104) is divided into many group photovoltaic power supply battery subelements, by conducting or the cut-off of each photovoltaic power supply battery subelement are controlled, make up different photovoltaic power supply battery subelement combination arrays, and then by the different photovoltaic power supply battery subelement combination array of conducting, so that described photovoltaic power supply battery pack (104) can provide a series of different output power values; The realtime power value of described bearing power acquisition module (101) Real-Time Monitoring circuit load (106), and the realtime power value that monitors directly fed back to the control module that is incorporated into the power networks (103); The described control module that is incorporated into the power networks (103) receives the realtime power value of bearing power acquisition module (101) feedback, utilize the resulting described realtime power value of described bearing power acquisition module (101) monitoring to determine the performance number of the photovoltaic power supply battery pack (104) that need to be connected in parallel with AC network, and then need to determine the photovoltaic power supply battery subelement combination array of conducting; Described switch module (102) is subjected to the control of the described control module that is incorporated into the power networks (103), by controlling conducting and the cut-off of different different photovoltaic power supply battery subelement combination arrays, the performance number that control photovoltaic power supply battery pack (104) is incorporated into the power networks and powers.
In sum, the control module that is incorporated into the power networks has guaranteed the load power consumption forever greater than the photovoltaic power supply amount, makes civil power forever have small electric weight to flow into user side; The bearing power acquisition module guarantees the accurate collection to the load end variation, and when changing appearred in load value, device can be made corresponding within the shortest time; The break-make way of switch module control battery pack guarantees that user side can utilize photovoltaic power supply to greatest extent.
The anti-reverse merit device of parallel net type photovoltaic power supply provided by the invention, utilize load end realtime power value that the bearing power acquisition module obtains to determine the wattage of the photovoltaic power supply battery pack that need to be connected in parallel with AC network by the control module that is incorporated into the power networks, under the condition of total wattage less than described realtime power value of the photovoltaic power supply battery that guarantees to be connected in parallel, can guarantee effectively that AC network is in the state to load supplying all the time, solve the contrary merit problem of the electric current that exists in the prior art, effectively guaranteed the fail safe that photovoltaic power supply equipment is incorporated into the power networks and powers.
In the present invention, because in parallel the photovoltaic power supply battery group, determine the combination array of photovoltaic power supply battery subelement conducting by the Real Time Monitoring to load, guarantee that the photovoltaic power output always less than load consumption, is in to the load supplying state utility grid all the time.Above-mentioned functions is passed through the bearing power acquisition module, switch module, and the control module that is incorporated into the power networks realizes.Thereby solved the be incorporated into the power networks inverse probability of engineering of low profile photovoltaic power supply and impacted the utility grid problem; Most of small-sized photovoltaic power stations all access the low voltage electric network that electric pressure is 0.4kV, are user's side self-contained type power-supply system substantially, generate power for their own use, not to medium voltage network or high-voltage fence feed., prevent that photovoltaic power supply from entering utility grid, thereby effectively prevent photovoltaic system to the electrical network feed only to inner mains supply in order to ensure the photovoltaic power supply system, guarantee the electrical network quality.
Although describe the present invention in connection with some exemplary enforcements and using method hereinafter, it will be appreciated by those skilled in the art that and be not intended to the present invention is limited to these embodiment.Otherwise, be intended to cover all substitutes, correction and the equivalent that are included in the defined spirit of the present invention of appending claims and the scope.
Other advantages of the present invention, target and feature will be set forth to a certain extent in the following description, and to a certain extent, based on being apparent to those skilled in the art to investigating hereinafter, perhaps can be instructed from the practice of the present invention.Target of the present invention and other advantages can be passed through following specification, claims, and the specifically noted structure realizes and obtains in the accompanying drawing.
Description of drawings
In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing, wherein:
Fig. 1 is the structure principle chart of the anti-reverse merit device of parallel net type photovoltaic power supply of the present invention;
Fig. 2 is the architecture principle figure of the control module that is incorporated into the power networks of the present invention, battery subelement and switch subelement.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with instantiation, and with reference to accompanying drawing, the present invention is further elaborated.
The embodiment of the invention provides a kind of parallel net type photovoltaic power supply anti-reverse merit device, according to real-time bearing power conditions of demand the battery of photovoltaic power supply equipment is carried out conducting or opening operation at the anti-reverse merit device of this parallel net type photovoltaic power supply, under the condition of total wattage less than load realtime power value of the photovoltaic power supply battery power output that guarantees to be connected in parallel, can effectively so that AC network is in all the time to the load supplying state, ensure the fail safe that photovoltaic power supply equipment and AC network are incorporated into the power networks.
Control strategy of the present invention is to determine conducting and cut-off to battery pack by to consuming the size contrast of holding realtime power value and the battery-powered value of photovoltaic power supply, guarantees that the amount of power supply of photovoltaic power supply battery pack is held the electric weight that needs less than consuming forever.
The structure principle chart of the anti-reverse merit device of parallel net type photovoltaic power supply that embodiments of the invention provide as shown in Figure 1, the anti-reverse merit device of this parallel net type photovoltaic power supply comprises: bearing power acquisition module 101, switch module 102, control module 103 is incorporated into the power networks, and photovoltaic power supply battery pack 104, AC network 105 and load 106.
Bearing power acquisition module 101 is connected with load 106, is used for the realtime power value of the load 106 of observation circuit, and the realtime power value (being monitor value) of demand is directly fed back to the control module 103 that is incorporated into the power networks.The control module that is incorporated into the power networks 103 is electrically connected with bearing power acquisition module 101, receive the real-time bearing power value of bearing power acquisition module 101 feedbacks, the routine analyzer that the control module that is incorporated into the power networks 103 inner inputs are set in advance, the realtime power value of utilizing bearing power acquisition module 101 to obtain is carried out the numerical value contrast, and be worth immediate output power guaranteeing to provide as far as possible with bearing power under output power is less than the prerequisite of bearing power, performance number (wattage) by the photovoltaic power supply battery pack 104 determining to be connected in parallel with AC network, needing to obtain the combination array of the battery subelement of conducting, which and show by the charactron that is connected with photovoltaic power supply battery pack 104 or the light-emitting diode battery subelement combination array pie graph (be the battery subelement combination array of conducting, by conducting battery subelement consist of) to conducting.
That is to say, under the prerequisite of power supply gross power less than the described realtime power value that monitors that guarantees photovoltaic power supply battery pack (104), calculate and the immediate output power value of the described realtime power value that monitors, as the performance number of the photovoltaic power supply battery pack (104) that need to be connected in parallel with AC network.The performance number of the photovoltaic power supply battery pack (104) that the control module that is incorporated into the power networks (103) is connected in parallel according to as above determined needs of method and AC network, and then need to determine the photovoltaic power supply battery subelement of conducting.
Owing to needing the output power of control photovoltaic power supply to be less than the real-time requirement power of load 106, thereby guaranteed to form the contrary merit of 104 pairs of AC network 105 of photovoltaic power supply battery pack, so the wattage of the photovoltaic power supply battery pack 104 that is connected in parallel is less than the realtime power value; Switch module 102 is electrically connected with the control module 103 that is incorporated into the power networks, switch module 102 be subject to the being incorporated into the power networks control of control module 103, also be electrically connected to simultaneously photovoltaic power supply battery pack 104 and load 106, conducting (connection) and cut-off (disconnection) that control photovoltaic power supply battery pack is incorporated into the power networks and powers.
In a preferred embodiment, the array of photovoltaic power supply battery pack 104 is grouped into a plurality of photovoltaic power supply battery subelements, 102 pairs every group photovoltaic power supply battery of application switch module subelement is controlled, described switch module comprises the variable connector subelement that links to each other with each group photovoltaic power supply battery subelement, each switch subelement of described switch module is determined conducting and the cut-off of each way switch subelement by described control module 103 controls of being incorporated into the power networks.
Wherein, each is organized photovoltaic power supply battery subelement and is series battery, and its power is by the photovoltaic power supply battery number of separately series connection and the output power decision of photovoltaic power supply battery, and each organizes between the photovoltaic power supply battery subelement in parallel.
In a preferred embodiment, the described control module 103 that is incorporated into the power networks is to use the single-chip microcomputer of input control program, photovoltaic power supply battery pack 104 is controlled, thereby the photovoltaic power supply battery subelement combination array of conducting is wanted in decision.
Can also comprise among this embodiment: photovoltaic power supply power display module, the output power (wattage) of the photovoltaic power supply battery pack 104 that needs conducting that the control module 103 that is used for being incorporated into the power networks is determined shows, so that the result is more directly perceived.The display device of photovoltaic power supply power display module can but to be not limited to be indicator light, charactron, light-emitting diode or liquid crystal display screen.In a preferred embodiment, switch module 102 is solid-state relay control circuits, by solid-state relay conducting or the cut-off of battery pack is controlled
The architecture principle figure of the control module that is incorporated into the power networks of the present invention, battery subelement and switch subelement as shown in Figure 2, the corresponding component that the anti-reverse merit device of this parallel net type photovoltaic power supply comprises is identical with Fig. 1, and wherein switch module 102 and photovoltaic power supply battery pack 104 comprise respectively some subelements.Be specially: the first switch subelement 1021, second switch subelement 1022, the three switch subelements 1023, the four switch subelements 1024; The first battery subelement 1041, the second battery subelements 1042, the three battery subelements 1043, the four battery subelements 1044; Wherein the first switch subelement 1021 is electrically connected with the first battery subelement 1041, second switch subelement 1022 is electrically connected with the second battery subelement 1042, the 3rd switch subelement 1023 is electrically connected with the 3rd battery subelement 1043, and the 4th switch subelement 1024 is electrically connected with the 4th battery subelement 1044; The four-way switch of whole switch module is controlled by the control module that is incorporated into the power networks simultaneously, determine the opening and closing of each way switch, controlled by corresponding switch subelement with the battery subelement that the switch subelement is electrically connected mutually, realize conducting and the cut-off of four road battery subelements, finish the power supply of being incorporated into the power networks.
In a preferred embodiment, when each battery subelement is 1.5 kilowatts of output power series batteries, it is 6 kilowatts output power that gross power externally can be provided, and, after determining its break-make by the switch subelement of the control module control of being incorporated into the power networks, can realize the output power output of 0 kilowatt, 1.5 kilowatts, 3 kilowatts, 4.5 kilowatts and 6 kilowatts 5 grades, in power supply process is incorporated into the power networks in realization, it should be noted that the magnitude of voltage that photovoltaic power supply equipment provides should adapt with the magnitude of voltage that AC network provides.
Another kind of photovoltaic power supply battery pack configuration mode can be that power is configured by the progression growth pattern, for example can be that the first battery subelement 1041 is the series battery of 2.7 kilowatts of output powers, the second battery subelement 1042 is the series battery of 5.4 kilowatts of output powers, the 3rd battery subelement 1043 is the series battery of 10.8 kilowatts of output powers, and the 4th battery subelement 1044 is the series battery of 21.6 kilowatts of output powers.Input the realtime power value of the 103 pairs of loads of control module of being incorporated into the power networks of setting program analyzes by realization, draw after the calculating and the immediate output power value of the realtime power value of load, thereby the break-make of control switch (conduction and cut-off), can realize the output power output of 16 grades, make power supply output meticulousr, in power supply process is incorporated into the power networks in realization, it should be noted that the magnitude of voltage that photovoltaic power supply equipment provides should adapt with the magnitude of voltage that AC network provides, and the supply power voltage of each road battery subelement is identical.Equally, which can show by the charactron that is connected with photovoltaic power supply battery pack 104 or the light-emitting diode combination array pie graph (be the battery subelement combination array of conducting, by conducting battery subelement consist of) to the battery subelement of conducting.
In a preferred embodiment of the invention, use the single-chip microcomputer of input control program the photovoltaic power supply battery pack is controlled, thereby determine the battery subelement combination array that the photovoltaic power supply battery pack is connected.In the present embodiment, be by the input power of every group of photovoltaic power supply battery subelement and the contrast of load value, determine the combination array of the battery subelement of photovoltaic power supply end conducting.Described single-chip microcomputer is 51 type single-chip microcomputers; Described control program is the C programmer with computing, comparison, identification, control function.
In a preferred embodiment, power with four road battery subelements, actually can be not limited to four the tunnel, also can be the power supply of two-way battery subelement, the power supply of three road battery subelements, the power supply of five road battery subelements, perhaps more, concrete condition can be planned for foundation according to the electrical network actual conditions of the power supply of being incorporated into the power networks.This embodiment can be the total output power of other numerical value according to the characteristics of various photovoltaic power supply equipment itself and the different situations of the power supply of being incorporated into the power networks take total output power of 6 kilowatts as example in the reality.
Can also comprise in a preferred embodiment: photovoltaic power supply power display module, the power supply wattage of the photovoltaic power supply battery pack 104 that the needs of determining for the control module 103 that will be incorporated into the power networks connect shows.So that the result is more directly perceived.The display device of photovoltaic power supply power display module can but to be not limited to be indicator light, charactron or liquid crystal display screen.
Another embodiment of the present invention also provides a kind of parallel net type photovoltaic power supply anti-reverse merit method.The method is divided into many group photovoltaic power supply battery subelements with photovoltaic power supply battery pack 104, by conducting or the cut-off of each photovoltaic power supply battery subelement are controlled, make up different photovoltaic power supply battery subelement combination arrays, and then by the different photovoltaic power supply battery subelement combination array of conducting, so that described photovoltaic power supply battery pack 104 can provide a series of different output power values; The realtime power value of described bearing power acquisition module 101 Real-Time Monitoring circuit loads 106, and the realtime power value that monitors directly fed back to the control module 103 that is incorporated into the power networks; The described control module 103 that is incorporated into the power networks receives the realtime power value of bearing power acquisition module 101 feedbacks, utilize the resulting described realtime power value of described bearing power acquisition module 101 monitorings to determine the performance number of the photovoltaic power supply battery pack 104 that need to be connected in parallel with AC network, and then need to determine the photovoltaic power supply battery subelement combination array of conducting; Described switch module 102 is subjected to the control of the described control module 103 that is incorporated into the power networks, by controlling conducting and the cut-off of different different photovoltaic power supply battery subelement combination arrays, the performance number that control photovoltaic power supply battery pack 104 is incorporated into the power networks and powers.
It should be noted that at last, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although with reference to preferred embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (10)
1. the anti-reverse merit device of parallel net type photovoltaic power supply comprises bearing power acquisition module (101), switch module (102), and the control module that is incorporated into the power networks (103), photovoltaic power supply battery pack (104) is characterized in that:
Described photovoltaic power supply battery pack (104) is divided into many group photovoltaic power supply battery subelements, by conducting or the cut-off of each photovoltaic power supply battery subelement are controlled, make up different photovoltaic power supply battery subelement combination arrays, and then by the different photovoltaic power supply battery subelement combination array of conducting, so that described photovoltaic power supply battery pack (104) can provide a series of different output power values;
Described bearing power acquisition module (101) is used for the realtime power value of Real-Time Monitoring circuit load (106), and the realtime power value that monitors is directly fed back to the control module that is incorporated into the power networks (103);
The described control module that is incorporated into the power networks (103) is electrically connected with described bearing power acquisition module (101), receive the realtime power value of bearing power acquisition module (101) feedback, utilize the resulting described realtime power value of described bearing power acquisition module (101) monitoring to determine the performance number of the photovoltaic power supply battery pack (104) that need to be connected in parallel with AC network, and then need to determine the photovoltaic power supply battery subelement combination array of conducting;
Described switch module (102) is electrically connected with photovoltaic power supply battery pack (104), circuit load (106) and the control module that is incorporated into the power networks (103), be subjected to the control of the described control module that is incorporated into the power networks (103), by controlling conducting and the cut-off of different different photovoltaic power supply battery subelement combination arrays, the performance number that control photovoltaic power supply battery pack (104) is incorporated into the power networks and powers.
2. according to claim 1 the anti-reverse merit device of parallel net type photovoltaic power supply, the wherein said control module that is incorporated into the power networks (103) determine that the performance number of the photovoltaic power supply battery pack (104) that need to be connected in parallel with AC network comprises:
Under the prerequisite of power supply gross power less than the described realtime power value that monitors that guarantees photovoltaic power supply battery pack (104), calculate and the immediate output power value of the described realtime power value that monitors, as the performance number of the photovoltaic power supply battery pack (104) that need to be connected in parallel with AC network.
3. the anti-reverse merit device of parallel net type photovoltaic power supply as claimed in claim 1, it is characterized in that application switch module (102) controls every group of photovoltaic power supply battery subelement, described switch module comprises the variable connector subelement that links to each other with each group photovoltaic power supply battery subelement, each switch subelement of described switch module is determined conducting and the cut-off of each way switch subelement by the described control module that is incorporated into the power networks (103) control.
4. such as the anti-reverse merit device of each described parallel net type photovoltaic power supply of claim 1-3, it is characterized in that:
Each is organized photovoltaic power supply battery subelement and is series battery, and its power is by the photovoltaic power supply battery number of separately series connection and the output power decision of photovoltaic power supply battery, and each organizes between the photovoltaic power supply battery subelement in parallel.
5. such as the anti-reverse merit device of each described parallel net type photovoltaic power supply of claim 1-3, it is characterized in that the described control module that is incorporated into the power networks (103) is to use the single-chip microcomputer of input control program, photovoltaic power supply battery pack (104) is controlled, thereby the photovoltaic power supply battery subelement combination array of conducting is wanted in decision.
6. such as the anti-reverse merit device of each described parallel net type photovoltaic power supply of claim 1-3, characterized by further comprising digital display tube or light-emitting diode, the photovoltaic power supply battery subelement combination array pie graph of conducting is shown in real time.
7. such as the anti-reverse merit device of each described parallel net type photovoltaic power supply of claim 1-3, characterized by further comprising photovoltaic power supply power display module, be used for photovoltaic power supply power is shown in real time.
8. the anti-reverse merit device of parallel net type photovoltaic power supply as claimed in claim 7, the display device of described photovoltaic power supply power display module comprises indicator light, in charactron or the liquid crystal display screen any one.
9. such as the anti-reverse merit device of each described parallel net type photovoltaic power supply of claim 1-3, it is characterized in that described switch module is the solid-state relay control circuit, by solid-state relay conducting or the cut-off of each photovoltaic power supply battery subelement are controlled, thereby made up different photovoltaic power supply battery subelement combination arrays.
10. anti-reverse merit method of parallel net type photovoltaic power supply is characterized in that comprising:
Photovoltaic power supply battery pack (104) is divided into many group photovoltaic power supply battery subelements, by conducting or the cut-off of each photovoltaic power supply battery subelement are controlled, make up different photovoltaic power supply battery subelement combination arrays, and then by the different photovoltaic power supply battery subelement combination array of conducting, so that described photovoltaic power supply battery pack (104) can provide a series of different output power values;
The realtime power value of described bearing power acquisition module (101) Real-Time Monitoring circuit load (106), and the realtime power value that monitors directly fed back to the control module that is incorporated into the power networks (103);
The described control module that is incorporated into the power networks (103) receives the realtime power value of bearing power acquisition module (101) feedback, utilize the resulting described realtime power value of described bearing power acquisition module (101) monitoring to determine the performance number of the photovoltaic power supply battery pack (104) that need to be connected in parallel with AC network, and then need to determine the photovoltaic power supply battery subelement combination array of conducting;
Described switch module (102) is subjected to the control of the described control module that is incorporated into the power networks (103), by controlling conducting and the cut-off of different different photovoltaic power supply battery subelement combination arrays, the performance number that control photovoltaic power supply battery pack (104) is incorporated into the power networks and powers.
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