CN105356840A - Photovoltaic power generation circuit and photovoltaic power generation circuit inverter allocation method - Google Patents
Photovoltaic power generation circuit and photovoltaic power generation circuit inverter allocation method Download PDFInfo
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- CN105356840A CN105356840A CN201510852310.0A CN201510852310A CN105356840A CN 105356840 A CN105356840 A CN 105356840A CN 201510852310 A CN201510852310 A CN 201510852310A CN 105356840 A CN105356840 A CN 105356840A
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- 238000010248 power generation Methods 0.000 title claims abstract description 161
- 238000000034 method Methods 0.000 title claims abstract description 16
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 10
- 229910052802 copper Inorganic materials 0.000 claims description 10
- 239000010949 copper Substances 0.000 claims description 10
- 238000010586 diagram Methods 0.000 description 9
- 230000001012 protector Effects 0.000 description 7
- 101150028119 SPD1 gene Proteins 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 208000025274 Lightning injury Diseases 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
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- 229910052751 metal Inorganic materials 0.000 description 1
- 238000004377 microelectronic Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/08—Limitation or suppression of earth fault currents, e.g. Petersen coil
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering with light sensitive cells
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Photovoltaic Devices (AREA)
- Inverter Devices (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The embodiments of the invention disclose a photovoltaic power generation circuit and a photovoltaic power generation circuit inverter allocation method. The photovoltaic power generation circuit comprises at least two battery pack units and at least two first selection circuit units, wherein each battery pack unit comprises a photovoltaic power generation battery pack and a first switching element, each first selection circuit unit comprises an inverter and a second switching element, the at least two battery pack units are connected in parallel, and the at least two first selection circuit units are connected in parallel; the input end of the first switching element is connected with the anode of the photovoltaic power generation battery pack, while the output end is connected with the input end of the second switching element; the output end of the second switching element is connected with the input end of the inverter; each battery pack unit is used for converting solar energy into direct-current electric energy and outputting the direct-current electric energy to each first selection circuit unit; and each first selection circuit unit is used for converting the received direct-current electric energy into alternating-current electric energy. The embodiments of the invention solve the problem of free switching between a plurality of photovoltaic power generation battery packs and a plurality of inverters.
Description
Technical Field
The invention relates to the field of photovoltaic power generation, in particular to a photovoltaic power generation circuit and a photovoltaic power generation circuit inverter distribution method.
Background
The solar photovoltaic power generation technology is a power generation technology for converting solar energy into electric energy based on a photovoltaic effect, and mainly converts the solar energy into the electric energy by utilizing a solar photovoltaic power generation battery pack consisting of elements manufactured by a microelectronic process technology. The technology has the advantages of no environmental pollution, high use safety performance, compatibility with other power supply systems and the like.
In general, a photovoltaic power generation circuit includes a plurality of photovoltaic power generation cell groups, and the plurality of photovoltaic power generation cell groups are usually connected in parallel. After absorbing the light energy, the photovoltaic power generation battery pack converts the light energy into direct current electric energy, and the direct current electric energy is not generally directly supplied to the equipment, and the direct current electric energy is stored by a tool for storing electric energy such as a storage battery or the like, or is converted into alternating current electric energy by an inverter and then supplied to the equipment. In the prior art, usually, a photovoltaic power generation battery pack and an inverter form a loop, and the wiring mode has the technical problem that when a user needs to freely switch between a plurality of photovoltaic power generation battery packs and a plurality of inverters, the connection relationship between the photovoltaic power generation battery packs and the inverters needs to be rewired.
Disclosure of Invention
The invention aims to provide a photovoltaic power generation circuit and a photovoltaic power generation circuit inverter distribution method, which can solve the problem of freely switching between a plurality of photovoltaic power generation battery packs and a plurality of inverters.
In order to achieve the purpose, the invention adopts the following technical scheme:
in one aspect, the invention discloses a photovoltaic power generation circuit, which comprises at least two battery pack units and at least two first selection circuit units,
the battery unit includes a photovoltaic power generation battery and a first switching element, the first selection circuit unit includes an inverter and a second switching element, wherein,
the at least two battery cells are connected in parallel, and the at least two first selection circuits are connected in parallel;
the input end of the first switch element is connected with the anode of the photovoltaic power generation battery pack, and the output end of the first switch element is connected with the input end of each second switch element; an output end of the second switching element is connected with an input end of the inverter;
the battery pack unit is used for converting solar energy into direct current electric energy and outputting the direct current electric energy to the first selection circuit unit;
the first selection circuit unit is used for converting the received direct current electric energy into alternating current electric energy.
On the other hand, the invention also discloses a photovoltaic power generation circuit inverter distribution method, which is characterized by comprising the following steps:
according to the corresponding relation of the photovoltaic power generation battery pack and the inverter distribution, controlling the on and off of a first switch element in the battery pack unit and controlling the on and off of a second switch element of the first selection circuit unit, and distributing at least one inverter for at least one photovoltaic power generation battery pack;
the photovoltaic power generation circuit comprises at least two battery pack units and at least two first selection circuit units, the battery pack units comprise photovoltaic power generation battery packs and first switch elements, the first selection circuit units comprise inverters and second switch elements, the at least two battery pack units are connected in parallel, and the at least two first selection circuits are connected in parallel; the input end of the first switch element is connected with the anode of the photovoltaic power generation battery pack, and the output end of the first switch element is connected with the input end of each second switch element; an output end of the second switching element is connected with an input end of the inverter; the battery pack unit is used for converting solar energy into direct current electric energy and outputting the direct current electric energy to the first selection circuit unit; the first selection circuit unit is used for converting the received direct current electric energy into alternating current electric energy.
In the photovoltaic power generation circuit provided by the embodiment of the present invention, the positive electrode of each photovoltaic power generation battery pack is connected in series with the input end of the first switching element, the input end of each inverter is connected in series with the output end of the second switching element, and the output end of the first switching element is connected with the input end of the second switching element. By selectively conducting one or more first switching elements and one or more second switching elements, and enabling the rest of the first switching elements and the rest of the second switching elements to be in the off state, one or more photovoltaic power generation battery packs and one or more inverters can form a loop. The problem of a photovoltaic power generation group and an inverter form a loop in the prior art is solved, and free switching between a plurality of photovoltaic power generation groups and a plurality of inverters is realized.
Drawings
In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, a brief description is given below of the drawings used in describing the embodiments. It should be clear that the described figures are only views of some of the embodiments of the invention to be described, not all, and that for a person skilled in the art, other figures can be derived from these figures without inventive effort.
Fig. 1 is a schematic structural diagram of a photovoltaic power generation circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a photovoltaic power generation circuit according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of another photovoltaic power generation circuit according to a second embodiment of the present invention;
fig. 4 is a schematic structural diagram of another photovoltaic power generation circuit provided in the third embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be fully described by the detailed description with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are a part of the embodiments of the present invention, not all embodiments, and all other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without inventive efforts fall within the scope of the present invention.
Example one
Fig. 1 is a schematic structural diagram of a photovoltaic power generation circuit according to a first embodiment of the present invention. The photovoltaic power generation circuit comprises at least two battery pack units and at least two first selection circuit units, wherein the battery pack units comprise photovoltaic power generation battery packs and first switching elements, and the first selection circuit units comprise inverters and second switching elements. The first switching element and the second switching element may be any one of a circuit breaker, a disconnecting switch or a circuit breaker, and may perform an on and off function.
In addition, on the basis of the technical scheme, the photovoltaic power generation circuit can further comprise a lightning protection device and a grounding device, the negative electrode of the photovoltaic power generation battery pack and the output end of the inverter are connected to the grounding device through the lightning protection device, the lightning protection device can be one of a lightning arrester or a surge protector, the grounding device can be one of a grounding resistor or a grounding copper bar, and in addition, the output end of the inverter can also be connected with the lightning protection device through the negative electrode copper bar.
For example, in the present embodiment, two battery units and four first selection circuit units are taken as an example, and a lightning arrester is taken as a surge protector, and a grounding device is taken as a grounding copper bar. It should be noted that the number of the battery unit and the first selection circuit unit and the selection of the lightning protection device and the grounding device are only examples and are not limited.
As shown in fig. 1, the photovoltaic power generation circuit includes:
a battery cell S1, a battery cell S2, a first selection circuit cell V1, a first selection circuit cell V2, a first selection circuit cell V3, and a first selection circuit cell V4, wherein,
the battery unit S1 includes a photovoltaic power generation battery S11 and a first switching element K11;
the battery unit S2 includes a photovoltaic power generation battery S12 and a first switching element K12;
the first selection circuit unit V1 includes an inverter V11 and a second switching element K21;
the first selection circuit unit V2 includes an inverter V12 and a second switching element K22;
the first selection circuit unit V3 includes an inverter V13 and a second switching element K23;
the first selection circuit unit V4 includes an inverter V14 and a second switching element K24;
lightning protection device SPD1, lightning protection device SPD2, negative copper bar and ground copper bar.
As shown in fig. 1, the input terminals (upper ends of K11 and K12 in the drawing) of the first switching element K11 and the first switching element K12 are connected to the positive electrodes ("+" terminals of S11 and S12 in the drawing) of the photovoltaic cell group S11 and the photovoltaic cell group S12, the output terminals (lower ends of K11 and K12 in the drawing) are connected to the input terminals (upper ends of K21, K22, K23 and K24 in the drawing) of the respective second switching elements, and the output terminals (lower ends of K21, K22, K23 and K24 in the drawing) of the respective second switching elements are connected to the input terminals (left ends of V11, V12, V13 and V14 in the drawing) of the respective inverters;
the positive electrode (the left upper end of the SPD1 in the figure) of the surge protector SPD1 is connected with the positive electrode of the photovoltaic power generation battery pack S11, the negative electrode (the right upper end of the SPD1 in the figure) is connected with the negative electrode (the minus end of the S11 in the figure) of the photovoltaic power generation battery pack S11, and the output end (the lower end of the SPD1 in the figure) is connected with a grounding copper bar; the positive electrode (the left upper end of the SPD2 in the figure) of the surge protector SPD2 is connected with the positive electrode of the photovoltaic power generation battery pack S12, the negative electrode (the right upper end of the SPD2 in the figure) is connected with the negative electrode (the minus end of the S12 in the figure) of the photovoltaic power generation battery pack S12, and the output end (the lower end of the SPD2 in the figure) is connected with a grounding copper bar; the grounding copper bar is connected to the ground through the metal lead so as to protect the photovoltaic power generation circuit from lightning stroke events.
The output ends (the right ends of V11, V12, V13 and V14 in the figure) of the inverter are connected with the negative electrode of the surge protector through a negative electrode copper bar.
The battery pack unit is used for converting solar energy into direct current electric energy and outputting the direct current electric energy to the first selection circuit unit; and the first selection circuit unit is used for converting the received direct current electric energy into alternating current electric energy.
In addition, it should be noted that the output of the inverter may also be connected to the input of a battery, or may be connected to a dc power consumer. In addition, the inverter can be used for measuring and controlling the conversion condition of the input electric energy of the photovoltaic power generation battery pack and the output electric energy of the inverter in the photovoltaic power generation circuit.
In order to express the technical solution of the first embodiment of the present invention more clearly, an example is now described. As shown in fig. 1, when the first switching element K11 and the second switching element K21 are in an on state, and the remaining first switching element (K12) and the remaining second switching element (K22, K23, and K24) are in an off state, the pv cell group S11 and the inverter V11 form a loop, and at this time, a pv cell group and an inverter form a loop;
when the first switching element K11, the second switching element K21 and the second switching element K22 are in an on state and the rest of the first switching element (K12) and the second switching element (K23 and K24) are in an off state, the photovoltaic cell group S11, the inverter V11 and the inverter V12 respectively form a loop, and at this time, the situation that one photovoltaic cell group and two inverters respectively form a loop is realized;
when the first switching element K11, the first switching element K12 and the second switching element K21 are in an on state and the other second switching elements (K22, K23 and K24) are in an off state, the photovoltaic cell group S11, the photovoltaic cell group S12 and the inverter V11 respectively form a loop, and at this time, the two photovoltaic cell groups and one inverter respectively form a loop;
when the first switching element K11, the first switching element K12, the second switching element K21, the second switching element K22, the second switching element K23 and the second switching element K24 are all in a conducting state, the photovoltaic cell group S11, the photovoltaic cell group S12 and the inverter V11, the inverter V12, the inverter V13 and the inverter V14 respectively form a loop, and at this time, the two photovoltaic cell groups and the four inverters respectively form a loop.
It should be noted that, the above-mentioned implementation that one photovoltaic power generation battery pack and one inverter form a loop, one photovoltaic power generation battery pack and two inverters form a loop, two photovoltaic power generation battery packs and one inverter form a loop, and two photovoltaic power generation battery packs and four inverters form a loop, is only an example, when the first switching element and the second switching element which are different are selectively turned on and the remaining first switching element and the second switching element are in the off state, the one-to-one, one-to-many, many-to-one, and many-to-many free selection relationships between the photovoltaic power generation battery pack and the inverters can be implemented.
In the photovoltaic power generation circuit provided by the embodiment of the present invention, the positive electrode of each photovoltaic power generation battery pack is connected in series with the input end of the first switching element, the input end of each inverter is connected in series with the output end of the second switching element, and the output end of the first switching element is connected with the input end of the second switching element. By selectively conducting one or more first switching elements and one or more second switching elements and enabling the rest of the first switching elements and the rest of the second switching elements to be in the off state, a certain one or more photovoltaic power generation battery packs and one or more inverters can form a loop, the problem that in the prior art, one photovoltaic power generation battery pack and one inverter only form a loop is solved, and free switching between the photovoltaic power generation battery packs and the inverters is achieved.
Example two
Fig. 2 is a schematic structural diagram of a photovoltaic power generation circuit according to a second embodiment of the present invention. On the basis of the technical scheme of the first embodiment, the photovoltaic power generation circuit which can realize one-to-one, one-to-many, many-to-one and many-to-many free selection between the photovoltaic power generation battery pack and the inverter is further optimized by two pairs in the first embodiment of the invention, and a second selection circuit unit is added, and the unit can realize the loop formation between the appointed photovoltaic power generation battery pack and the appointed one or more inverters.
On the basis of the photovoltaic power generation circuit provided by the first embodiment, the second embodiment of the present invention adds at least one second selection circuit unit, where the second selection circuit unit includes: at least two third switching elements. Exemplarily, as shown in fig. 2, in the present embodiment, two second selection circuit units, each of which includes two third switching elements, are taken as an example for explanation.
The second selection circuit unit T1 includes a third switching element K31 and a third switching element K32;
the second selection circuit unit T2 includes a third switching element K33 and a third switching element K34; wherein,
the third switching element K31 and the third switching element K32 are connected in parallel, and the third switching element K33 and the third switching element K34 are connected in parallel;
the input terminals (upper ends of K31 and K32 in the drawing) of the third switching element K31 and the third switching element K32 are connected to the output terminal (lower end of K11 in the drawing) of the first switching element K11, and the output terminals (lower ends of K31 and K32 in the drawing) are connected to the input terminals (left ends of V11 and V12 in the drawing) of the inverter V11 and the inverter V12, respectively.
The input terminals (upper ends of K33 and K34 in the drawing) of the third switching element K33 and the third switching element K34 are connected to the output terminal (lower end of K12 in the drawing) of the first switching element K12, and the output terminals (lower ends of K33 and K34 in the drawing) are connected to the input terminals (left ends of V13 and V14 in the drawing) of the inverter V13 and the inverter V14, respectively.
When the first switching element K11 and the third switching element K31 are both turned on, the photovoltaic cell group S11 and the inverter V11 form a loop; when the first switching element K11 and the third switching element K32 are both turned on, the photovoltaic cell group S11 and the inverter V12 form a loop; when the first switching element K11, the third switching element K31, and the third switching element K32 are all turned on, the photovoltaic cell group S11 forms a loop with the inverter V11 and the inverter V12, respectively. The second selection circuit unit at this time can realize the loop formation between the designated photovoltaic power generation cell group S11 and the designated inverter V11 and/or the designated inverter V12.
When the first switching element K12 and the third switching element K33 are both turned on, the photovoltaic cell group S12 and the inverter V13 form a loop; when the first switching element K12 and the third switching element K34 are both turned on, the photovoltaic cell group S11 and the inverter V14 form a loop; when the first switching element K12, the third switching element K33, and the third switching element K34 are all turned on, the photovoltaic cell group S12 forms a loop with the inverter V13 and the inverter V14, respectively. The second selection circuit unit at this time can realize the loop formation between the designated photovoltaic power generation cell group S12 and the designated inverter V13 and/or the designated inverter V14.
In order to more clearly express the beneficial effects of the second embodiment of the present invention compared with the first embodiment, the following description is made. Now, the photovoltaic cell group S11 and the inverter V11 need to form a loop, and if the loop is connected through the first selection circuit, the first switching element K11 and the second switching element K21 need to be turned on, and the rest of the first switching element, the second switching element and the third switching element are all in an off state; if the first switching element K12 and the second switching element K21 are turned on due to misoperation, and the rest of the first switching element, the second switching element and the third switching element are all in the off state, the photovoltaic power generation battery pack S12 is connected with the loop of the inverter V11, and if the workers do not find the switching elements in time, unnecessary troubles and dangers are caused.
If the loop connection is realized by the second selection circuit unit, the first switching element K11 and the third switching element K31 need to be turned on, and the remaining first switching element, second switching element, and third switching element are all in an off state, and if the first switching element K12 and the third switching element K31 are turned on by a malfunction at this time and the remaining first switching element, second switching element, and third switching element are all in an off state, then the loop connection of the photovoltaic cell group S12 and the inverter V11 will not be realized by a malfunction because the first switching element K12 is not connected in series with the third switching element K31.
In addition to the beneficial effects of the first embodiment, the technical scheme provided by the second embodiment of the invention can enable a user to realize loop connection between the specified photovoltaic power generation battery pack and the specified inverter or inverters through the second selection circuit unit, thereby overcoming the problem of misconnection between the photovoltaic power generation battery pack and the inverters caused by misoperation in the first selection circuit unit, and enabling the operation to be more convenient and more targeted.
On the basis of the above technical solution, further, the photovoltaic power generation circuit may further include a fourth switching element, and an output end of the first switching element in the battery pack unit is connected to an input end of the second switching element in each of the first selection circuit units through the fourth switching element.
Fig. 3 is a schematic structural diagram of another photovoltaic power generation circuit according to a second embodiment of the present invention. On the basis of the schematic diagram of the photovoltaic power generation circuit provided in fig. 2, a fourth switching element is added in fig. 3. The number of the fourth switching elements may be less than or equal to the number of the battery cells, and in the present embodiment, it is preferable that the number of the fourth switching elements is equal to the number of the battery cells, i.e., there are two fourth switching elements, respectively, the fourth switching element K41 and the fourth switching element K42 in fig. 3.
Fig. 2 provides a circuit of the photovoltaic power generation circuit, if necessary, a specified photovoltaic power generation battery pack S11 and a specified inverter V11 are looped through a second selection circuit, and at the same time, a photovoltaic power generation battery pack S12 and an inverter V14 are looped through a first selection circuit. It is necessary to turn on the first switching element K11 and the third switching element K31, and the first switching element K12 and the second switching element K24, and the remaining first switching element, second switching element, and third switching element are in an off state. Then, in addition to the above-mentioned loop of the designated pv transmitting-side battery pack S11 and the designated inverter V11 and the loop of the pv generating battery pack S12 and the inverter V14, the designated pv generating battery pack S11 and the inverter V14 are also looped.
Therefore, the photovoltaic power generation circuit provided in fig. 3 is added with the fourth switching element on the basis of the photovoltaic power generation circuit provided in fig. 2. As shown in fig. 3, a fourth switching element K41 and a fourth switching element K42 are added, and when a loop needs to be formed between the designated photovoltaic cell group S11 and the designated inverter V11, the first switching element K11 and the third switching element K31 are turned on, and when a loop needs to be formed between the designated photovoltaic cell group S12 and the inverter V14, the first switching element K12, the fourth switching element K42 and the second switching element K24 are turned on, and the remaining second switching elements (K21, K22 and K23), the third switching elements (K32, K33 and K34) and the fourth switching element (K41) are in an off state. At this time, since the fourth switching element K41 is in the off state, the specified photovoltaic power generation cell group S11 cannot be looped with the inverter V14. Therefore, the addition of the fourth switching element in the photovoltaic power generation circuit can further improve the selectivity and operability of the circuit.
EXAMPLE III
Fig. 4 is a schematic structural diagram of another photovoltaic power generation circuit provided in the third embodiment of the present invention. On the basis of the technical scheme of the embodiment, the battery pack unit in the photovoltaic power generation circuit is further optimized, some electronic components for protecting the battery pack unit are added in the battery pack unit, and at least one of a one-way conduction device, an overcurrent protection device and a lightning protection device can be added in the battery pack unit.
The unidirectional conducting device has the advantages that when the voltage in a loop formed by the photovoltaic power generation battery pack and the inverter is abnormal, the photovoltaic power generation battery pack is protected from being damaged due to impact of reverse current; the overcurrent protection device has the function that when the current of the photovoltaic power generation battery pack is overlarge, the overcurrent protection device is automatically powered off so as to ensure that the inverter cannot be burnt due to the heavy current; the lightning protection device has the effect of ensuring that the photovoltaic power generation battery pack placed at a high place or an open position is prevented from being damaged by natural lightning. Preferably, the unidirectional device is a diode device, the overcurrent protection device is a fuse, and the lightning protection device is a surge protection device.
On the basis of the technical solution of the above embodiment, as shown in fig. 4, a diode E11 and a fuse R11 are added to the battery pack unit S1, wherein the diode E11 and the fuse R11 are connected in series between the positive electrode of the photovoltaic power generation battery pack S11 and the input terminal of the first switching element K11.
A diode E12 and a fuse R12 are added to the battery unit S2, wherein the diode E12 and the fuse R12 are connected in series between the positive electrode of the photovoltaic power generation battery S12 and the input terminal of the first switching element K12.
On the basis of the above technical solution, preferably, the positive electrodes of the surge protector SPD1 and the surge protector SPD2 are connected to the positive electrodes of the photovoltaic power generation battery pack S11 and the photovoltaic power generation battery pack S12 through a fifth switching element K51 and a fifth switching element K52, respectively.
In addition to the beneficial effects described in the above embodiments, the technical solution provided by the third embodiment of the present invention adds at least one of a unidirectional conducting device, an overcurrent protection device, and a lightning protection device that protect the battery unit, so that when abnormal voltage or abnormal current occurs in the circuit, the photovoltaic negative battery and the inverter are not damaged, and the operational safety of the photovoltaic power generation circuit is also improved.
Example four
The fourth embodiment of the invention provides a photovoltaic power generation circuit inverter distribution method. The method can be used for realizing the functions of any one of the photovoltaic power generation circuits in the above embodiments. The method specifically comprises the following operations:
s101, controlling the on and off of a first switching element in a battery pack unit and controlling the on and off of a second switching element of a first selection circuit unit according to the distribution corresponding relation of the photovoltaic power generation battery pack and the inverter, and distributing at least one inverter for at least one photovoltaic power generation battery pack;
in the above operation, the photovoltaic power generation circuit includes at least two battery cells and at least two first selection circuit cells. The battery pack unit comprises a photovoltaic power generation battery pack and a first switch element, the first selection circuit unit comprises an inverter and a second switch element, the at least two battery pack units are connected in parallel, and the at least two first selection circuits are connected in parallel; the input end of the first switch element is connected with the anode of the photovoltaic power generation battery pack, and the output end of the first switch element is connected with the input end of each second switch element; the output end of the second switching element is connected with the input end of the inverter; the battery pack unit is used for converting solar energy into direct current electric energy and outputting the direct current electric energy to the first selection circuit unit; the first selection circuit unit is used for converting the received direct current electric energy into alternating current electric energy.
The output end of the first switch element can be directly connected with the input end of the second switch element through a wire, and can also be connected through a fourth switch element.
In the above operation, the photovoltaic power generation battery pack and inverter distribution correspondence relationship includes:
the photovoltaic power generation system comprises 1 inverter corresponding to 1 photovoltaic power generation battery pack, a plurality of inverters corresponding to 1 photovoltaic power generation battery pack, 1 inverter corresponding to a plurality of photovoltaic power generation battery packs, and a plurality of inverters corresponding to a plurality of photovoltaic power generation battery packs.
Further, on the basis of the above technical solution, each battery unit in the photovoltaic power generation circuit may further include:
at least one of a unidirectional device, an overcurrent protection device and a lightning protection device, wherein,
the unidirectional protection device and the overcurrent protection device are connected in series between the anode of the photovoltaic power generation battery pack and the input end of the first switch element;
the positive pole of the lightning protection device is connected with the positive pole of the photovoltaic power generation battery pack, the negative pole of the lightning protection device is connected with the negative pole of the photovoltaic power generation battery pack, and the output end of the lightning protection device is connected with the grounding device.
The positive electrode of the lightning protection device can be directly connected with the positive electrode of the photovoltaic power generation battery pack through a wire, and can also be connected through a fifth switch element.
In addition, when the photovoltaic power generation circuit further comprises at least one second selection circuit unit, the second selection circuit unit comprises at least two third switching elements, wherein the at least two third switching elements are connected in parallel, wherein the input end of the third switching element is connected with the output end of the first switching element, and the output end of the third switching element is connected with the input end of the inverter;
when the photovoltaic power generation circuit further includes at least one second selection circuit unit including at least two third switching elements, the operations for allocating at least one inverter to at least one photovoltaic power generation cell group are optimized such that the first switching element in the cell group unit is controlled to be turned on and off and the second switching element of the first selection circuit unit is controlled to be turned on and off according to the photovoltaic power generation cell group and inverter allocation correspondence relationship:
s101', controlling the on and off of the first switching elements in the battery pack units and the second switching elements of all the first selection circuit units to be turned off, and controlling the third switching elements of the second selection circuit units to be turned on and off for distributing at least one inverter for at least one photovoltaic power generation battery pack.
According to the photovoltaic power generation circuit inverter distribution method, the first switch element in a certain battery pack unit can be controlled to be conducted according to the corresponding relation of the photovoltaic power generation battery pack and the inverter distribution, meanwhile, the second switch element in a certain first selection circuit unit is conducted, so that one-to-one loop formation between the photovoltaic power generation battery pack and the inverter is achieved, or the first switch element in a certain battery pack unit can be controlled to be conducted, meanwhile, the second switch elements of at least two first selection circuit units are conducted, so that one-to-many loop formation between the photovoltaic power generation battery pack and a plurality of inverters is achieved, the problem that in the prior art, one photovoltaic power generation battery pack can only form a loop with one inverter is solved, and free switching between the photovoltaic power generation battery pack and the inverters is achieved.
The photovoltaic power generation circuit inverter allocation method can be realized through software, namely the software acquires an inverter allocation instruction input by a user, inquires the corresponding relation between a photovoltaic power generation battery pack and the inverter allocation according to the instruction, respectively determines the names of a first switch element, a second switch element, a third switch element, a fourth switch element and a fifth switch element which need to be switched on and off, and sends the names of the switch elements which need to be switched on to a controller in the photovoltaic power generation circuit so as to instruct the controller to execute the corresponding switch element switching-on operation according to the names, so that the photovoltaic power generation battery pack and the inverter form a loop.
The foregoing is considered as illustrative of the preferred embodiments of the invention and technical principles employed. The present invention is not limited to the specific embodiments described herein, and various obvious changes, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the present invention. Therefore, although the present invention has been described in more detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the claims.
Claims (9)
1. A photovoltaic power generation circuit comprising at least two battery cells and at least two first selection circuit cells,
the battery unit includes a photovoltaic power generation battery and a first switching element, the first selection circuit unit includes an inverter and a second switching element, wherein,
the at least two battery cells are connected in parallel, and the at least two first selection circuits are connected in parallel;
the input end of the first switch element is connected with the anode of the photovoltaic power generation battery pack, and the output end of the first switch element is connected with the input end of each second switch element; an output end of the second switching element is connected with an input end of the inverter;
the battery pack unit is used for converting solar energy into direct current electric energy and outputting the direct current electric energy to the first selection circuit unit;
the first selection circuit unit is used for converting the received direct current electric energy into alternating current electric energy.
2. The photovoltaic power generation circuit according to claim 1, further comprising at least one second selection circuit unit including at least two third switching elements, wherein,
the at least two third switching elements are connected in parallel;
an input end of the third switching element is connected to an output end of the first switching element, and an output end thereof is connected to an input end of the inverter.
3. The photovoltaic power generation circuit according to claim 1, further comprising a fourth switching element, wherein the output terminal of the first switching element and the input terminal of each second switching element are connected through the fourth switching element.
4. A photovoltaic power generation circuit according to any one of claims 1 to 3, wherein the battery unit further comprises:
at least one of a unidirectional device, an overcurrent protection device and a lightning protection device, wherein,
the unidirectional protection device and the overcurrent protection device are connected in series between the anode of the photovoltaic power generation battery pack and the input end of the first switch element;
the positive pole of the lightning protection device is connected with the positive pole of the photovoltaic power generation battery pack, the negative pole of the lightning protection device is connected with the negative pole of the photovoltaic power generation battery pack, and the output end of the lightning protection device is connected with the grounding device.
5. The photovoltaic power generation circuit of claim 4, wherein the grounding device is a ground resistor or a ground copper bar.
6. The photovoltaic power generation circuit according to claim 4, wherein when the battery unit includes a lightning protection device, the positive electrode of the lightning protection device is connected to the positive electrode of the photovoltaic power generation battery through a fifth switching element.
7. A photovoltaic power generation circuit inverter distribution method, characterized in that the photovoltaic power generation circuit according to any one of claims 1 to 6 is adopted, and the method comprises the following steps:
according to the corresponding relation of the photovoltaic power generation battery pack and the inverter distribution, controlling the on and off of a first switch element in the battery pack unit and controlling the on and off of a second switch element of the first selection circuit unit, and distributing at least one inverter for at least one photovoltaic power generation battery pack;
the photovoltaic power generation circuit comprises at least two battery pack units and at least two first selection circuit units, the battery pack units comprise photovoltaic power generation battery packs and first switch elements, the first selection circuit units comprise inverters and second switch elements, the at least two battery pack units are connected in parallel, and the at least two first selection circuits are connected in parallel; the input end of the first switch element is connected with the anode of the photovoltaic power generation battery pack, and the output end of the first switch element is connected with the input end of each second switch element; an output end of the second switching element is connected with an input end of the inverter; the battery pack unit is used for converting solar energy into direct current electric energy and outputting the direct current electric energy to the first selection circuit unit; the first selection circuit unit is used for converting the received direct current electric energy into alternating current electric energy.
8. The method of claim 7, wherein the photovoltaic cell bank to inverter assignment correspondence comprises:
the photovoltaic power generation system comprises 1 inverter corresponding to 1 photovoltaic power generation battery pack, a plurality of inverters corresponding to 1 photovoltaic power generation battery pack, 1 inverter corresponding to a plurality of photovoltaic power generation battery packs, and a plurality of inverters corresponding to a plurality of photovoltaic power generation battery packs.
9. The method according to claim 7, wherein when the photovoltaic power generation circuit further includes at least one second selection circuit unit including at least two third switching elements, the controlling of the turning on and off of the first switching element in the battery unit and the controlling of the turning on and off of the second switching element of the first selection circuit unit for assigning at least one inverter to at least one photovoltaic power generation battery group according to the photovoltaic power generation battery group and inverter assignment correspondence relation comprises:
and controlling the conduction and the disconnection of the first switching elements in the battery pack units, and the conduction and the disconnection of the second switching elements of all the first selection circuit units, and controlling the conduction and the disconnection of the third switching elements of the second selection circuit units, so as to distribute at least one inverter for at least one photovoltaic power generation battery pack.
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Application publication date: 20160224 |