CN111585334A - Photovoltaic power supply system - Google Patents
Photovoltaic power supply system Download PDFInfo
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- CN111585334A CN111585334A CN202010326617.8A CN202010326617A CN111585334A CN 111585334 A CN111585334 A CN 111585334A CN 202010326617 A CN202010326617 A CN 202010326617A CN 111585334 A CN111585334 A CN 111585334A
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- electric energy
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- battery module
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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
- 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
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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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 power supply system, which considers that different connection modes (parallel connection or series connection and the like) among a plurality of battery modules can influence electric energy parameters (current or voltage) received by each battery module, so that a first connection mode can be determined according to the electric energy parameters of the electric energy output by a photovoltaic battery, and then the plurality of battery modules are controlled by a switch switching circuit to store the electric energy output by an electric energy adjusting circuit in the first connection mode.
Description
Technical Field
The invention relates to the field of photovoltaic power generation, in particular to a photovoltaic power supply system.
Background
The photovoltaic power generation is a new energy power generation technology which is mature day by day, because the photovoltaic power generation has stronger dependency on illumination intensity, the power generation is difficult under the condition of weaker illumination intensity, which requires that a photovoltaic power supply system can store the electric energy generated by a photovoltaic cell and output the electric energy to a load when needed.
Therefore, how to provide a solution to the above technical problem is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a photovoltaic power supply system, which saves energy and improves charging efficiency.
In order to solve the above technical problem, the present invention provides a photovoltaic power supply system, including:
a photovoltaic cell and a plurality of cell modules;
the electric energy adjusting circuit is connected with the photovoltaic cell and is used for adjusting the electric energy parameters of the electric energy output by the photovoltaic cell to the electric energy parameters required by the battery module connected with the electric energy adjusting circuit;
the switch switching circuit is respectively connected with the electric energy regulating circuit and the battery module;
and the controller is connected with the switch switching circuit and used for determining a first connection mode according to the electric energy parameter of the electric energy output by the photovoltaic cell when the output power of the photovoltaic cell is greater than the maximum power of a load, and controlling the plurality of battery modules to store the electric energy output by the electric energy adjusting circuit in the first connection mode through the switch switching circuit so as to improve the electric energy adjusting efficiency of the electric energy adjusting circuit.
Preferably, the controller is further configured to determine a second connection manner according to an input characteristic parameter of the load when the output power of the photovoltaic cell is less than the minimum power of the load, and control the plurality of battery modules to supply power to the electric energy regulating circuit in the second connection manner through the switch switching circuit, so as to improve the electric energy adjustment efficiency of the electric energy regulating circuit;
the power regulating circuit is further configured to adjust the power parameter of the output power of the battery module to the input characteristic parameter of the load.
Preferably, the electric energy regulating circuit comprises a first charge-discharge electronic circuit and a second charge-discharge electronic circuit;
the switch switching circuit comprises a first switch, a second switch, a third switch and a fourth switch;
a first contact of the first switch is connected with a positive electrode of a first battery module, a second contact of the first switch is connected with a positive electrode of a first charge-discharge electronic circuit, a third contact of the first switch is connected with a positive electrode of a second charge-discharge electronic circuit, a first contact of the second switch is connected with a negative electrode of the first battery module, a second contact of the second switch is connected with a negative electrode of the first charge-discharge electronic circuit, a third contact of the second switch is connected with a second contact of the third switch, a first contact of the third switch is connected with a positive electrode of the second battery module, a third contact of the third switch is connected with a positive electrode of the second charge-discharge electronic circuit, a first contact of the fourth switch is connected with a negative electrode of the second battery module, and a second contact of the fourth switch is connected with a negative electrode of the first charge-discharge electronic circuit, a third contact of the fourth switch is connected with the negative electrode of the second charge-discharge electronic circuit;
the photovoltaic power supply system also comprises a fifth switch and a sixth switch;
a first end of the fifth switch is connected with an output end of the photovoltaic cell, a first end of the sixth switch and the load, a second end of the fifth switch is connected with the first charge-discharge electronic circuit, and a second end of the sixth switch is connected with the second charge-discharge electronic circuit;
the control ends of the first switch, the second switch, the third switch, the fourth switch, the fifth switch and the sixth switch are all connected with the control end of the controller;
the controller is further configured to close only one of the fifth switch and the sixth switch when either of the first connection and the second connection is series.
Preferably, the determining the first connection mode according to the electric energy parameter of the electric energy output by the photovoltaic cell specifically includes:
judging whether the difference value of the output power of the photovoltaic cell minus the maximum power of the load is larger than the required power of a single battery module;
if the output current value is larger than the required power of a single battery module, judging whether the output current value of the photovoltaic battery is larger than a preset current threshold value;
if the current is larger than the preset current threshold, the first connection mode of the battery modules is parallel connection;
if the current is not greater than the preset current threshold, the first connection mode of the battery modules is series connection;
if the output voltage is not greater than the required power of a single battery module, judging whether the output voltage of the photovoltaic battery is greater than a preset voltage threshold value;
if the voltage is larger than the preset voltage threshold, the first connection mode of the battery modules is series connection;
and if the voltage is not greater than the preset voltage threshold, the first connection mode of the battery modules is parallel connection.
Preferably, the determining the second connection mode according to the input characteristic parameter of the load specifically includes:
judging whether the required voltage value of the load is less than two times of the output voltage value of the battery module;
if the output voltage value of the battery module is less than two times, judging whether the sum of the output power of any battery module and the output power of the photovoltaic battery is greater than the lowest power of the load or not;
if the power is larger than the lowest power of the load, the second connection mode is not connected; and the step of controlling the plurality of battery modules to supply power to the electric energy adjusting circuit in the second connection mode through the switch switching circuit is specifically as follows: the switch switching circuit is used for controlling and judging the power supply of the battery module to the load through any one of the charge-discharge electronic circuits;
if the power is not larger than the lowest power of the load, the second connection mode is parallel connection;
and if the output voltage value of the battery module is not less than twice, the second connection mode is series connection.
Preferably, the photovoltaic power supply system further comprises a seventh switch;
a first end of the seventh switch is connected to the photovoltaic cell, a first end of the fifth switch, and a first end of the sixth switch, respectively, a second end of the seventh switch is connected to the load, and a control end of the seventh switch is connected to the controller;
the controller is further configured to control the seventh switch to open when the load is not in need of power.
Preferably, the step of supplying power to the load through any one of the charge and discharge electronic circuits by the battery module for which the judgment is controlled by the switch switching circuit is specifically:
and the switch switching circuit controls and judges the used battery module and circularly supplies power to the load through the single charging and discharging sub-circuit.
Preferably, the first switch, the second switch, the third switch and the fourth switch are single-pole double-throw switches.
Preferably, the controller is a single chip microcomputer.
The invention provides a photovoltaic power supply system, which considers that different connection modes (parallel connection or series connection and the like) among a plurality of battery modules can influence electric energy parameters (current or voltage) received by each battery module, so that a first connection mode can be determined according to the electric energy parameters of the electric energy output by a photovoltaic battery, and then the plurality of battery modules are controlled by a switch switching circuit to store the electric energy output by an electric energy adjusting circuit in the first connection mode.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the prior art and the embodiments are briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a photovoltaic power supply system provided by the present invention;
fig. 2 is a schematic structural diagram of another photovoltaic power supply system provided by the present invention.
Detailed Description
The core of the invention is to provide a photovoltaic power supply system, which saves energy and improves charging efficiency.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a photovoltaic power supply system provided in the present invention, the photovoltaic power supply system includes:
a photovoltaic cell 1 and a plurality of cell modules 4;
the electric energy adjusting circuit 2 is connected with the photovoltaic cell 1 and is used for adjusting the electric energy parameters of the electric energy output by the photovoltaic cell 1 to the electric energy parameters required by the battery module 4 connected with the electric energy adjusting circuit;
a switch switching circuit 3 connected to the electric energy adjusting circuit 2 and the battery module 4, respectively;
and the controller is connected with the switch switching circuit 3 and used for determining a first connection mode according to the electric energy parameter of the electric energy output by the photovoltaic cell 1 when the output power of the photovoltaic cell 1 is greater than the maximum power of the load, and controlling the plurality of battery modules 4 to store the electric energy output by the electric energy adjusting circuit 2 in the first connection mode through the switch switching circuit 3 so as to improve the electric energy adjusting efficiency of the electric energy adjusting circuit 2.
Specifically, in view of the technical problems in the background art, in the embodiment of the present invention, a plurality of battery modules 4 and a switching circuit 3 for changing the connection manner between the plurality of battery modules 4 may be provided, since the applicant considers that the plurality of battery modules 4 can match the electric energy parameters required by the plurality of battery modules 4 as a whole with the electric energy parameters output by the photovoltaic cell 1 by the change of the connection manner itself, so as to reduce the difference between the two, in this way, the range of the electric energy parameter adjustment required by the electric energy adjustment circuit 2 when performing the electric energy parameter adjustment is relatively small, the waste of energy is reduced, for example, when the voltage value of the electric energy output by the photovoltaic cell 1 is relatively high, the plurality of battery modules 4 may be connected in series, so as to improve the capability of storing high-voltage electric energy of the plurality of battery modules 4 as a whole, when the voltage value of the electric energy output by the photovoltaic cell 1 is low, the plurality of battery modules 4 can be connected in parallel, and the overall electric energy storage capacity of the plurality of battery modules 4 can be improved, so that the purpose of saving energy is finally achieved.
The number of the battery modules 4 may be designed by itself, for example, the number of the battery modules may be two, and the embodiment of the present invention is not limited herein.
Specifically, the corresponding relationship between the electric energy parameter and the first connection mode may be preset, so that the first connection mode that should be provided between the plurality of battery modules 4 may be quickly determined according to the electric energy parameter of the electric energy output by the photovoltaic cell 1, and the specific form of the corresponding relationship may be set autonomously, which is not limited herein.
Specifically, the switch switching circuit 3 may be used to change the connection relationship between the plurality of battery modules 4 under the control of the controller, and the specific form thereof may be various types, and the embodiment of the present invention is not limited herein.
The specific type of the electrical energy parameter may be various, for example, including voltage, current, and the like, and the embodiment of the present invention is not limited herein.
The first connection manner may be of various types, for example, may be a series connection, a parallel connection, and the like, and the embodiment of the present invention is not limited herein.
The invention provides a photovoltaic power supply system, which considers that different connection modes (parallel connection or series connection and the like) among a plurality of battery modules can influence electric energy parameters (current or voltage) received by each battery module, so that a first connection mode can be determined according to the electric energy parameters of the electric energy output by a photovoltaic battery, and then the plurality of battery modules are controlled by a switch switching circuit to store the electric energy output by an electric energy adjusting circuit in the first connection mode.
On the basis of the above-described embodiment:
as a preferred embodiment, the controller is further configured to, when the output power of the photovoltaic cell 1 is smaller than the minimum power of the load, determine a second connection manner according to the input characteristic parameter of the load, and control the plurality of battery modules 4 to supply power to the electric energy adjusting circuit 2 in the second connection manner through the switch switching circuit 3, so as to improve the electric energy adjusting efficiency of the electric energy adjusting circuit 2;
the power conditioning circuit 2 is further configured to adjust the power parameter of the output power of the battery module 4 to the input characteristic parameter of the load.
Specifically, since the connection manner among the plurality of battery modules 4 may be controlled in the present application, in this way, when the battery modules 4 supply power to the load, a second connection manner may be determined by combining the input characteristic parameters of the load, and then the plurality of battery modules 4 are controlled to supply power to the power adjusting circuit 2 in the second connection manner, in this way, the power adjusting efficiency of the power adjusting circuit 2 may also be improved, for example, when the load has a high requirement on the input voltage, the plurality of battery modules 4 may be controlled to be connected in series to supply power to the load, and the embodiment of the present invention is not limited herein.
Specifically, electric energy adjusting circuit 2 also needs to carry out the adjustment of electric energy parameter when battery module 4 supplies power for the load, and because the condition itself can be through the control to the second connection mode of a plurality of battery module 4 quality control change the electric energy that a plurality of battery modules 4 provided, so that the electric energy parameter of the electric energy that a plurality of battery modules 4 provided matches with the input characteristic parameter of load, make both comparatively close, the control range of electric energy adjusting circuit 2 to the electric energy has been reduced, electric energy adjustment efficiency has been improved, the waste of the energy has been reduced.
The corresponding relationship between the input characteristic parameter of the load and the second connection mode may be preset, so as to quickly determine the second connection mode that should be provided between the plurality of battery modules 4 when supplying power to the load according to the input characteristic parameter of the load, and the corresponding relationship between the input characteristic parameter of the preset load and the second connection mode may be in various specific forms, which is not limited herein in the embodiment of the present invention.
Specifically, the second connection manner may be of various types, for example, the second connection manner may be a series connection manner, a parallel connection manner, or only some of the battery modules 4 may supply power in a parallel or series connection manner, and the embodiment of the present invention is not limited herein.
For better explaining the embodiment of the present invention, please refer to fig. 2, fig. 2 is a schematic structural diagram of another photovoltaic power supply system provided by the present invention, and as a preferred embodiment, the electric energy adjusting circuit 2 includes a first charge-discharge electronic circuit and a second charge-discharge electronic circuit;
the switch switching circuit 3 includes a first switch S1, a second switch S2, a third switch S3, and a fourth switch S4;
a first contact of a first switch S1 is connected with a positive electrode of the first battery module 4, a second contact of a first switch S1 is connected with a positive electrode of the first charge-discharge electronic circuit, a third contact of the first switch S1 is connected with a positive electrode of the second charge-discharge electronic circuit, a first contact of a second switch S2 is connected with a negative electrode of the first battery module 4, a second contact of a second switch S2 is connected with a negative electrode of the first charge-discharge electronic circuit, a third contact of a second switch S2 is connected with a second contact of a third switch S3, a first contact of a third switch S3 is connected with a positive electrode of the second battery module 4, a third contact of a third switch S387s 5 is connected with a positive electrode of the second charge-discharge electronic circuit, a first contact of a fourth switch S4 is connected with a negative electrode of the second battery module 4, a second contact of a fourth switch S4 is connected with a negative electrode of the first charge-discharge electronic circuit, and a fourth contact of the fourth switch S4 is connected with a negative electrode of the second charge-discharge electronic circuit;
the photovoltaic power supply system also comprises a fifth switch K2 and a sixth switch K3;
a first end of the fifth switch K2 is connected with the output end of the photovoltaic cell 1, a first end of the sixth switch K3 and the load, a second end of the fifth switch K2 is connected with the first charge-discharge electronic circuit, and a second end of the sixth switch K3 is connected with the second charge-discharge electronic circuit;
the control ends of the first switch S1, the second switch S2, the third switch S3, the fourth switch S4, the fifth switch K2 and the sixth switch K3 are all connected with the control end of the controller;
the controller is further configured to close only one of the fifth switch K2 and the sixth switch K3 when either of the first connection and the second connection is in series.
Specifically, in the embodiment of the present invention, two battery modules 4 are included, and the corresponding electric energy adjusting circuit 2 also includes a first charge-discharge electronic circuit corresponding to the first battery module 4 and a second charge-discharge electronic circuit corresponding to the second battery module 4, so that when the connection manner is parallel connection, the two charge-discharge electronic circuits can conveniently process the electric energy transmitted to/output from the two parallel battery modules 4.
The controller may conveniently change the connection manner between the two battery modules 4 by controlling the first switch S1, the second switch S2, the third switch S3, and the fourth switch S4, and the specific control manner may correspond to the connection manner, for example, when the first connection manner is parallel connection, the first battery module 4 needs to be charged through the first charge-discharge electronic circuit, the second battery module 4 needs to be supplied with power through the second charge-discharge electronic circuit, and the fifth switch K2 and the sixth switch K3 need to be closed, which is not limited in the embodiment of the present invention.
Specifically, each charge-discharge electronic circuit has the same function as the electric energy adjusting module, that is, the electric energy parameter of the electric energy output by the photovoltaic cell 1 is adjusted to the electric energy parameter required by the battery module 4 connected to the charge-discharge electronic circuit, and the electric energy parameter of the electric energy output by the battery module 4 connected to the charge-discharge electronic circuit is also adjusted to the input characteristic parameter of the load.
Of course, the specific number of the battery modules 4 may be set independently, for example, 3, but the number of the charge and discharge electronic circuits corresponding to each other may also be 3, so as to perform parallel charge and discharge.
As a preferred embodiment, the determining the first connection mode according to the electric energy parameter of the output electric energy of the photovoltaic cell 1 specifically includes:
judging whether the difference value of the output power of the photovoltaic cell 1 minus the maximum power of the load is larger than the required power of a single cell module 4;
if the output current value is larger than the required power of the single battery module 4, judging whether the output current value of the photovoltaic battery 1 is larger than a preset current threshold value;
if the current is greater than the preset current threshold, the first connection mode of the battery modules 4 is parallel connection;
if the current is not greater than the preset current threshold, the first connection mode of the battery modules 4 is series connection;
if the power is not larger than the required power of the single battery module 4, judging whether the output voltage of the photovoltaic battery 1 is larger than a preset voltage threshold value;
if the voltage is greater than the preset voltage threshold, the first connection mode of the battery modules 4 is series connection;
if the voltage is not greater than the preset voltage threshold, the first connection mode of the battery modules 4 is parallel connection.
Specifically, since the difference between the output power of the photovoltaic cell 1 and the maximum power of the load is not necessarily larger than the required power of a single module, that is, the output power of the photovoltaic cell 1 may be large enough (enough to support the load and the battery module 4) or not large enough (only the maximum power of the load can be supported but not simultaneously support the required power of a single battery module 4), and in these two cases, the electrical energy parameter of the photovoltaic cell 1 is greatly different, in this embodiment of the present invention, it may be determined first whether the difference between the output power of the photovoltaic cell 1 and the maximum power of the load is larger than the required power of a single battery module 4, so as to control the battery modules 4 to present different first connection manners in different situations.
Specifically, for better explaining the embodiments of the present invention, please refer to table 1 below, where table 1 is a control table of the switch switching circuit 3 for charging the battery module 4 by the photovoltaic battery 1;
TABLE 1
Wherein, PpvMay be the difference of the output power of the photovoltaic cell 1 minus the maximum power of the load, PbMay be the power demand, I, of a single battery module 4pvMay be the output current value, I, of the photovoltaic cell 1pv_setMay be a predetermined battery threshold value, UpvMay be the output voltage value, U, of the photovoltaic cell 1pv_setA voltage threshold is preset.
Specifically, when the difference between the output power of the photovoltaic cell 1 and the maximum power of the load is greater than the required power of the single cell module 4, it may be proved that the output power of the photovoltaic cell 1 is sufficiently large, in this case, the influence of the current may be stronger than the influence of the voltage on the cell module 4, so that it may be determined whether the output current value of the photovoltaic cell 1 is greater than the preset current threshold value, if so, half of the output current of the photovoltaic cell 1 may substantially satisfy the current requirement of the single cell module 4, so that the first connection mode may be determined as parallel connection, otherwise, if not, half of the output current of the photovoltaic cell 1 may be insufficient to support the current requirement of the single cell module 4, in this case, the first connection mode may be determined as series connection, so that the output current of the photovoltaic cell 1 matches the required currents of the plurality of cell modules 4, the burden on the power conditioning circuit 2 is reduced.
Specifically, when the difference between the output power of the photovoltaic cell 1 and the maximum power of the load is not greater than the required power of the single cell module 4, it may be considered that the influence of the voltage is stronger than the influence of the current on the cell module 4 in this case, and therefore, it may be determined whether the output voltage of the photovoltaic cell 1 is greater than the preset voltage threshold, and if so, it represents that half of the output voltage of the photovoltaic cell 1 may substantially satisfy the voltage requirement of the single cell module 4, and therefore, the first connection mode may be determined as series connection, whereas, if not, it represents that half of the output voltage of the photovoltaic cell 1 may not be enough to support the voltage requirement of the single cell module 4, and in this case, the first connection mode may be determined as parallel connection, so that the output voltage of the photovoltaic cell 1 matches the required voltages of the plurality of cell modules 4, the burden on the power conditioning circuit 2 is reduced.
It should be noted that, when the first connection mode is a series connection mode, a single charge/discharge sub-circuit may be controlled to operate, for example, the first charge/discharge sub-circuit and the second charge/discharge sub-circuit may be controlled to operate alternately for a long time, so as to prolong the service life of the two charge/discharge sub-circuits.
Specifically, the preset current threshold and the preset voltage threshold may be set independently, and embodiments of the present invention are not limited herein.
As a preferred embodiment, the determining the second connection manner according to the input characteristic parameter of the load specifically includes:
judging whether the required voltage value of the load is less than two times of the output voltage value of the battery module 4;
if the output voltage value of the battery module 4 is less than two times, judging whether the sum of the output power of any battery module 4 and the output power of the photovoltaic cell 1 is greater than the lowest power of the load;
if the power is higher than the lowest power of the load, the second connection mode is not connected; and the switch switching circuit 3 controls the plurality of battery modules 4 to supply power to the electric energy adjusting circuit 2 in a second connection mode, specifically: the switch switching circuit 3 controls and judges the used battery module 4 to supply power to the load through any one charge-discharge electronic circuit;
if the power is not higher than the lowest power of the load, the second connection mode is parallel connection;
if the output voltage value is not less than twice the output voltage value of the battery module 4, the second connection mode is series connection.
Specifically, considering that the sum of the output voltage values of the two battery modules 4 has a required voltage value that cannot satisfy the load, which is related to the specific type of the second connection manner, in the embodiment of the present invention, it may be determined whether the required voltage value of the load is less than twice the output voltage value of the battery module 4, so as to determine the suitable second connection manner.
Specifically, for better explaining the embodiment of the present invention, please refer to table 2 below, where table 2 is a control table of the switch switching circuit 3 for supplying power to the load by the battery module 4;
TABLE 2
Wherein, PpMay be the output power, P, of the photovoltaic cell 1loadIs the minimum power, P, of the loadload_setMay be the maximum power of the load, UloadIs the required voltage value of the load, UbatIs the output voltage value of the battery module 4.
If the required voltage value of the load is not less than twice the output voltage value of the battery modules 4, it is described that the voltage value output by connecting the two battery modules 4 in series can better satisfy the required voltage value of the load, and therefore, in this case, the second connection mode may be determined to be series connection.
Specifically, if the required voltage value of the load is less than two times the output voltage value of the battery module 4, it is described that the output voltage value of one time of the battery module 4 may substantially satisfy the required voltage value of the load, and considering that the output power of a single output module may not satisfy the minimum power of the load, in the embodiment of the present invention, it may be determined whether the sum of the output power of any battery module 4 and the output power of the photovoltaic cell 1 is greater than the minimum power of the load, so as to better determine the second connection mode in the case where "the required voltage value of the load is less than two times the output voltage value of the battery module 4".
If the sum of the output power of any battery module 4 and the output power of the photovoltaic cell 1 is greater than the minimum power of the load, it indicates that the power requirement of the load can be met by the single battery module 4 used for judgment plus the photovoltaic cell 1, at this time, the second connection mode can be determined to be unconnected, and the battery module 4 used for judgment can be controlled to supply power to the load through any charge-discharge electronic circuit (of course, here, one of the charge-discharge electronic circuits can also be intermittently and alternately controlled to work so as to prolong the service life of the charge-discharge electronic circuit), whereas, if the sum of the output power of any battery module 4 and the output power of the photovoltaic cell 1 is not greater than the minimum power of the load, it indicates that the power requirement of the load cannot be met by the single battery module 4 plus the photovoltaic cell 1, at this time, the second connection mode can be determined to be parallel connection, so as to improve the power contribution of the battery module 4 on the basis of the power contribution of the photovoltaic cell 1, better match the power of the load and reduce the adjustment range of the charge-discharge electronic circuit.
As a preferred embodiment, the photovoltaic power supply system further comprises a seventh switch K1;
a first end of the seventh switch K1 is connected with the photovoltaic cell 1, a first end of the fifth switch K2 and a first end of the sixth switch K3 respectively, a second end of the seventh switch K1 is connected with a load, and a control end of the seventh switch K1 is connected with the controller;
the controller is also arranged to control the seventh switch K1 to open when the load does not need to be supplied.
Specifically, through the seventh switch K1, the controller can conveniently cut off the load under the condition that the load does not have a power supply requirement, so that the electric energy generated by the photovoltaic cell 1 can be safely supplied to the battery module 4, and the convenience of control is improved.
As a preferred embodiment, the step of controlling and judging the power supply of the battery module 4 used by the switch switching circuit 3 to the load through any one of the charge and discharge electronic circuits is specifically as follows:
the switch switching circuit 3 controls the battery module 4 for judgment, and power is supplied to the load circularly through a single charging and discharging sub-circuit.
Specifically, considering that when a single battery module 4 supplies power to a load, theoretically, any one of the charge and discharge sub-circuits may be switched to supply power to the load, and the load of the two charge and discharge sub-circuits may be reduced, in this application, the single charge and discharge sub-circuit may be cycled to supply power to the load, and the duty cycle of each charge and discharge sub-circuit may be set by itself, for example, the duty cycles of the two charge and discharge sub-circuits may be the same, and the embodiment of the present invention is not limited herein.
As a preferred embodiment, the first switch S1, the second switch S2, the third switch S3, and the fourth switch S4 are single pole double throw switches.
Specifically, the single-pole double-throw switch has the advantages of simple structure, low cost, long service life and the like.
Of course, the first switch S1, the second switch S2, the third switch S3, and the fourth switch S4 may be of other types besides the single-pole double-throw switch, and the embodiment of the invention is not limited herein.
As a preferred embodiment, the controller is a single chip.
Specifically, the single chip microcomputer has the advantages of small size, high processing speed, low cost and the like.
Of course, the controller may be of various types other than a single chip, and the embodiment of the present invention is not limited herein.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A photovoltaic power supply system, comprising:
a photovoltaic cell and a plurality of cell modules;
the electric energy adjusting circuit is connected with the photovoltaic cell and is used for adjusting the electric energy parameters of the electric energy output by the photovoltaic cell to the electric energy parameters required by the battery module connected with the electric energy adjusting circuit;
the switch switching circuit is respectively connected with the electric energy regulating circuit and the battery module;
and the controller is connected with the switch switching circuit and used for determining a first connection mode according to the electric energy parameter of the electric energy output by the photovoltaic cell when the output power of the photovoltaic cell is greater than the maximum power of a load, and controlling the plurality of battery modules to store the electric energy output by the electric energy adjusting circuit in the first connection mode through the switch switching circuit so as to improve the electric energy adjusting efficiency of the electric energy adjusting circuit.
2. The system according to claim 1, wherein the controller is further configured to determine a second connection manner according to an input characteristic parameter of the load when the output power of the photovoltaic cell is less than the minimum power of the load, and control the plurality of battery modules to supply power to the power conditioning circuit in the second connection manner through the switch switching circuit, so as to improve the power conditioning efficiency of the power conditioning circuit;
the power regulating circuit is further configured to adjust the power parameter of the output power of the battery module to the input characteristic parameter of the load.
3. The photovoltaic power supply system of claim 2, wherein the power conditioning circuit comprises a first charge-discharge electronic circuit and a second charge-discharge electronic circuit;
the switch switching circuit comprises a first switch, a second switch, a third switch and a fourth switch;
a first contact of the first switch is connected with a positive electrode of a first battery module, a second contact of the first switch is connected with a positive electrode of a first charge-discharge electronic circuit, a third contact of the first switch is connected with a positive electrode of a second charge-discharge electronic circuit, a first contact of the second switch is connected with a negative electrode of the first battery module, a second contact of the second switch is connected with a negative electrode of the first charge-discharge electronic circuit, a third contact of the second switch is connected with a second contact of the third switch, a first contact of the third switch is connected with a positive electrode of the second battery module, a third contact of the third switch is connected with a positive electrode of the second charge-discharge electronic circuit, a first contact of the fourth switch is connected with a negative electrode of the second battery module, and a second contact of the fourth switch is connected with a negative electrode of the first charge-discharge electronic circuit, a third contact of the fourth switch is connected with a negative electrode of the second charge-discharge electronic circuit;
the photovoltaic power supply system also comprises a fifth switch and a sixth switch;
a first end of the fifth switch is connected with an output end of the photovoltaic cell, a first end of the sixth switch and the load, a second end of the fifth switch is connected with the first charge-discharge electronic circuit, and a second end of the sixth switch is connected with the second charge-discharge electronic circuit;
the control ends of the first switch, the second switch, the third switch, the fourth switch, the fifth switch and the sixth switch are all connected with the control end of the controller;
the controller is further configured to close only one of the fifth switch and the sixth switch when either of the first connection and the second connection is series.
4. The photovoltaic power supply system according to claim 3, wherein the determining of the first connection mode according to the electric energy parameter of the output electric energy of the photovoltaic cell specifically includes:
judging whether the difference value of the output power of the photovoltaic cell minus the maximum power of the load is larger than the required power of a single battery module;
if the output current value is larger than the required power of a single battery module, judging whether the output current value of the photovoltaic battery is larger than a preset current threshold value;
if the current is larger than the preset current threshold, the first connection mode of the battery modules is parallel connection;
if the current is not greater than the preset current threshold, the first connection mode of the battery modules is series connection;
if the output voltage is not greater than the required power of a single battery module, judging whether the output voltage of the photovoltaic battery is greater than a preset voltage threshold value;
if the voltage is larger than the preset voltage threshold, the first connection mode of the battery modules is series connection;
and if the voltage is not greater than the preset voltage threshold, the first connection mode of the battery modules is parallel connection.
5. The photovoltaic power supply system according to claim 4, wherein the determining of the second connection mode according to the input characteristic parameter of the load is specifically:
judging whether the required voltage value of the load is less than two times of the output voltage value of the battery module;
if the output voltage value of the battery module is less than two times, judging whether the sum of the output power of any battery module and the output power of the photovoltaic battery is greater than the lowest power of the load or not;
if the power is larger than the lowest power of the load, the second connection mode is not connected; and the step of controlling the plurality of battery modules to supply power to the electric energy regulating circuit in the second connection mode through the switch switching circuit is specifically as follows: the switch switching circuit is used for controlling and judging the power supply of the battery module to the load through any one of the charge-discharge electronic circuits;
if the power is not larger than the lowest power of the load, the second connection mode is parallel connection;
and if the output voltage value of the battery module is not less than twice, the second connection mode is series connection.
6. The photovoltaic power supply system of claim 5, further comprising a seventh switch;
a first end of the seventh switch is connected to the photovoltaic cell, a first end of the fifth switch, and a first end of the sixth switch, respectively, a second end of the seventh switch is connected to the load, and a control end of the seventh switch is connected to the controller;
the controller is further configured to control the seventh switch to open when the load is not in need of power.
7. The photovoltaic power supply system according to claim 5, wherein the step of controlling and judging the battery module to supply power to the load through any one of the charge and discharge electronic circuits by the switch switching circuit is specifically as follows:
the battery module used for judgment is controlled by the switch switching circuit, and power is supplied to the load circularly through the single charge-discharge electronic circuit.
8. The photovoltaic power system of any of claims 3 to 7, wherein the first switch, the second switch, the third switch, and the fourth switch are single pole double throw switches.
9. The photovoltaic power supply system of claim 1, wherein the controller is a single-chip microcomputer.
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| CN202010326617.8A CN111585334A (en) | 2020-04-23 | 2020-04-23 | Photovoltaic power supply system |
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| CN202010326617.8A CN111585334A (en) | 2020-04-23 | 2020-04-23 | Photovoltaic power supply system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022254372A1 (en) * | 2021-06-02 | 2022-12-08 | Tong Yui Lung | Stored-energy power systems |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022254372A1 (en) * | 2021-06-02 | 2022-12-08 | Tong Yui Lung | Stored-energy power systems |
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