CN113031693A - Solar power supply system, and control method and device of solar power supply system - Google Patents

Solar power supply system, and control method and device of solar power supply system Download PDF

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Publication number
CN113031693A
CN113031693A CN201911358901.7A CN201911358901A CN113031693A CN 113031693 A CN113031693 A CN 113031693A CN 201911358901 A CN201911358901 A CN 201911358901A CN 113031693 A CN113031693 A CN 113031693A
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China
Prior art keywords
input
output
power supply
unit
solar power
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CN201911358901.7A
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Chinese (zh)
Inventor
曹捷
杨瑞建
曹前
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ZTE Corp
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ZTE Corp
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Priority to CN201911358901.7A priority Critical patent/CN113031693A/en
Priority to PCT/CN2020/139428 priority patent/WO2021129808A1/en
Publication of CN113031693A publication Critical patent/CN113031693A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/66—Regulating electric power
    • G05F1/67—Regulating electric power to the maximum power available from a generator, e.g. from solar cell
    • 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
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • 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
    • H02S40/30—Electrical components
    • 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)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Direct Current Feeding And Distribution (AREA)

Abstract

The invention provides a solar power supply system, a control method and a control device of the solar power supply system, wherein the solar power supply system comprises a photovoltaic PV assembly and a direct current bus; wherein, PV subassembly correspondence is provided with the PU device, the PU device includes: a PU input end configured to be connected to the PV module; the PU output end is connected with the direct current bus; and the direct-current chopping DC/DC unit is arranged between the negative pole of the PU input end and the negative pole of the PU output end, and the DC/DC unit is configured to realize voltage transformation between the PU input end and the PU output end. The invention solves the problem that devices and wiring required to be arranged in the PU device in the related technology are too complex, so as to achieve the effects of reducing the number of the devices and the lines in the PU device arrangement, thereby reducing the cost and the construction complexity.

Description

Solar power supply system, and control method and device of solar power supply system
Technical Field
The invention relates to the field of photovoltaics, in particular to a solar power supply system, and a control method and device of the solar power supply system.
Background
With the development of information technology, 4G communication is popularized and used comprehensively, and meanwhile, the trial and commercial use of 5G communication is also expected. Providing a stable and reliable power supply system for a mobile communication base station in a remote area is one of the important factors for improving the coverage rate of a mobile communication network. At present, the application of green renewable energy, such as solar energy, to the power supply of the remote base station is a successful way.
With the increasing maturity of solar power generation technology, the position of solar power generation in an energy system becomes more important, and the solar power generation technology is widely regarded and developed. In order to ensure reliable power supply of communication equipment in remote areas, many power supply equipment manufacturers have introduced solar power supply-based products such as pure light, light-oil mixing, photoelectric mixing, wind-light-oil-electricity mixing and the like, and all the products need to adopt a solar power supply system. In the related art, each group of solar modules in the solar system corresponds to one Power Unit (PU) device, and in order to maintain the output Power of the solar modules, each PU device independently performs Maximum Power Point Tracking (MPPT) control on the group of solar modules.
In the related art, in the function implementation process of the PU device, the layout of the cable and the arrangement of related devices need to be performed according to actual engineering requirements, for example, a connection cable between the PU device and a corresponding solar Photovoltaic (PV) module, and a direct current lightning protection module or device for avoiding the PU device from being struck by lightning. However, in the process of laying out the cables and arranging the related devices, the PU devices in the related art need to be arranged one by one for each PU device, so that the number of the whole wiring and the devices in the solar power supply system is too large, and the cost and the construction complexity are difficult to control.
In view of the above-mentioned problems of the related art, in which the devices and wiring required to be provided by the PU apparatus are too complicated, the related art has not provided an effective solution.
Disclosure of Invention
The embodiment of the invention provides a solar power supply system, a control method and a control device of the solar power supply system, and aims to at least solve the problems that devices required to be arranged and wiring of a PU device in the related art are too complex.
According to an embodiment of the present invention, there is provided a solar power supply system including: a photovoltaic PV assembly and a DC bus; wherein, PV subassembly correspondence is provided with the PU device, the PU device includes:
a PU input end configured to be connected to the PV module;
the PU output end is connected with the direct current bus;
and the direct-current chopping DC/DC unit is arranged between the negative pole of the PU input end and the negative pole of the PU output end, and the DC/DC unit is configured to realize voltage transformation between the PU input end and the PU output end.
According to another embodiment of the present invention, there is also provided a control method of a solar power supply system, which is applied to the solar power supply system described in the above embodiment; the method comprises the following steps:
and realizing voltage transformation between the PU input end and the PU output end of the PU device through the DC/DC unit so as to carry out Maximum Power Point Tracking (MPPT) control on the solar power supply system.
According to another embodiment of the present invention, there is also provided a control device of a solar power supply system, which is applied to the solar power supply system described in the above embodiment; the device comprises:
the control module is configured to realize voltage transformation between the PU input end and the PU output end of the PU device through the DC/DC unit so as to perform Maximum Power Point Tracking (MPPT) control on the solar power supply system.
According to another embodiment of the present invention, there is also provided an electronic device, including a memory in which a computer program is stored and a processor configured to execute the computer program to perform the steps in any of the above method embodiments.
According to the invention, as the PV component is correspondingly provided with the PU device in the solar power supply system comprising the photovoltaic PV component and the direct current bus, and the DC/DC unit arranged between the negative electrode of the PU input end connected with the PV component and the negative electrode of the PU output end connected with the direct current bus in the PU device, the transformation can be realized between the PU input end and the PU output end. Therefore, the invention can solve the problem that the devices and the wiring required to be arranged in the PU device in the related technology are too complex, so as to achieve the effects of reducing the number of the devices and the lines in the PU device arrangement, thereby reducing the cost and the construction complexity.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a system schematic diagram (one) of a solar power supply system provided according to an embodiment of the invention;
FIG. 2 is an internal schematic diagram of a PU apparatus provided according to the related art;
FIG. 3 is a system schematic of a solar power system provided in accordance with the related art;
FIG. 4 is an internal schematic diagram of a PU apparatus provided according to an embodiment of the invention;
fig. 5 is a system schematic diagram (two) of a solar power supply system provided according to an embodiment of the present invention;
fig. 6 is a system schematic diagram (three) of a solar power supply system provided according to an embodiment of the invention;
FIG. 7 is a circuit schematic of a DC/DC unit provided in accordance with an embodiment of the present invention;
FIG. 8 is a schematic circuit diagram (I) of a solar power supply system provided in accordance with an embodiment of the present invention;
fig. 9 is a schematic circuit diagram (two) of a solar power supply system provided according to an embodiment of the present invention;
fig. 10 is a flowchart of a control method of a solar power supply system according to an embodiment of the present invention;
fig. 11 is a block diagram of a control device of a solar power supply system according to an embodiment of the present invention.
Detailed Description
The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
Example 1
Fig. 1 is a system schematic diagram (one) of a solar power supply system according to an embodiment of the present invention, and as shown in fig. 1, the solar power supply system in the embodiment includes: a photovoltaic PV assembly 102 and a dc bus 104; wherein, the PV subassembly corresponds and is provided with PU device 106, and PU device 106 includes:
a PU input 1062 configured to couple to PV assembly 102;
a PU output port 1064 configured to be connected to the dc bus 104;
and a DC chopper DC/DC unit 1066 disposed between a negative electrode of the PU input port 1062 and a negative electrode of the PU output port 1064, where the DC/DC unit 1066 is configured to implement voltage transformation between the PU input port 1062 and the PU output port 1064.
It should be further noted that the PV assemblies are correspondingly provided with the PU devices, that is, each PV assembly is indicated to be correspondingly provided with one PU device, but the corresponding relationship between the PV assemblies and the PU devices may be realized by cable connection, or may not be realized by cable connection, that is, it is only required to ensure that the number of PV assemblies corresponds to the number of PU devices, which is not limited in the present invention.
In the PU device, the PU input is including the positive pole and the negative pole of input, and is corresponding, and the PU output includes the positive pole and the negative pole of output, the positive pole of PU input and the anodal intercommunication of PU output, the negative pole of PU input and the negative pole intercommunication of PU output.
Further, a load is usually connected to the dc bus in the above embodiments.
Through the solar power supply system in the above embodiment, because in the solar power supply system including photovoltaic PV subassembly and direct current bus, the PV subassembly is provided with the PU device correspondingly, in the PU device, set up with the PV subassembly is connected the negative pole of PU input and with direct current bus is connected the DC/DC unit between the negative pole of PU output, can realize the vary voltage between the PU input with the PU output. Therefore, the solar power supply system in the embodiment can solve the problem that devices and wiring required to be arranged in the PU device in the related art are too complex, so as to achieve the effects of reducing the number of the devices and lines in the PU device arrangement, and reducing the cost and the construction complexity.
Fig. 2 is an internal schematic diagram of a PU device provided according to the related art, and as shown in fig. 2, a DC/DC unit in the PU device in a solar power supply system in the related art is often disposed between a positive electrode of a PU input terminal and a positive electrode of a PU output terminal; under the internal structure of the PU device in the related art, because the DC/DC unit of the PU device is disposed between the positive electrode of the PU input end and the positive electrode of the PU output end, the negative electrode of the PU input end and the negative electrode of the PU output end in the PU device cannot perform independent loop control, and then each PU device can only be connected with the corresponding PV module individually (if a plurality of PU devices and a plurality of PV modules are connected in a tandem, current flows back from the negative electrode side of a certain PU device, and the device is damaged), and corresponding direct current lightning protection devices are disposed on the positive electrode and the negative electrode of the PU input end of the PU device, respectively. Fig. 3 is a system diagram of a solar power supply system provided according to the related art, in which the solar power supply system is as shown in fig. 3.
Compared with the internal structure of the PU device in the related art, the solar power supply system in this embodiment enables independent loop control between the negative electrode of the PU input end and the negative electrode of the PU output end of each PU device by setting the DC/DC unit between the negative electrodes of the PU input end and the PU output end, so that the PU device is connected with the PV device no matter how, the overcurrent phenomenon can be avoided between the negative electrode of the PU input end and the negative electrode of the PU output end of the PU device. In addition, the internal structure of the PU device can realize the functions of a plurality of direct current protection devices in the related technology only by arranging the only direct current protection device between the anode and the cathode of the PU input end.
In an optional embodiment, the PU device 106 further comprises:
an input current detection unit 1068 configured to detect an input current at the PU input 1062, the input current detection unit 1068 being disposed between the negative electrode of the PU input 1062 and the DC/DC unit 1066;
an output current detection unit 1070 configured to detect an output current of the PU output 1064, the output current detection unit 1070 being disposed between the negative electrode of the PU output 1064 and the DC/DC unit 1066.
It should be further noted that fig. 4 is an internal schematic diagram of a PU device according to an embodiment of the present invention, and in the above alternative embodiment, the structural arrangement of the input current detection unit and the output current detection unit is as shown in fig. 4. The input current electrical measurement unit and the output current detection unit can respectively detect the input current of a PU input end and the output current of a PU output end in the PU device, so that the DC/DC unit can perform voltage transformation processing according to a corresponding detection result. The input circuit detection unit and the output circuit detection unit in the above-mentioned optional embodiments may cooperate with the operation of the DC/DC unit disposed between the negative electrode of the PU input terminal and the negative electrode of the PU output terminal to further improve the loop control in the PU device and the MPPT control of the PV module. In an alternative embodiment, the input current detection unit is formed by a first detection resistor, and the output current detection unit is formed by a second electrical detection resistor.
In an optional embodiment, the solar power supply system further comprises a PV module set 108, wherein the PV module set 108 comprises a plurality of PV modules 102; one PU device 106 is provided for each PV assembly 102 in the PV assembly set 108.
It should be further noted that, in the above alternative embodiment, the PV module set indicates a set of PV modules, and the set does not refer to a specific entity, specifically, a generic term of PV modules in the solar power supply system; a plurality of PV assemblies in the set of PV assemblies may be interconnected in a predetermined connection.
In an alternative embodiment, PV assembly set 108 includes a set output 1082, PV assembly 102 includes a PV output 1022; wherein, the positive poles of the PV output terminals 1022 of the PV modules are connected to the positive pole of the collective output terminal 1082, and the negative poles of the PV output terminals 1022 of the PV modules are connected to the negative pole of the collective output terminal 1082;
the positive pole of the aggregate output port 1082 is connected to the dc bus 104, and the negative pole of the aggregate output port 1082 is connected to the negative pole of the PU input port 1062 of the plurality of PU devices, respectively.
It should be further noted that the PV output terminal indicates a corresponding output terminal of the PV module, and the PV output terminal also includes a positive electrode and a negative electrode; the set output end indicates an independent output end arranged corresponding to a PV assembly set formed by a plurality of PV assemblies, the set output end is unique, and the set output end also comprises a positive pole and a negative pole. In the PV module set, the PV modules are connected in parallel, specifically, the positive electrodes of the PV output ends of the PV modules are converged to the positive electrode of the set output end, specifically, the positive electrodes of the PV output ends are uniformly indicated to be connected with the positive electrode of the set output end, specifically, the positive electrodes of the PV output ends are respectively connected to the positive electrodes of the set output end, or the positive electrodes of the PV output ends are sequentially connected, and then the connected line is connected to the positive electrode of the set output end, which is not limited in the present invention. Similarly, the cathodes of the PV output ends of the PV modules are converged to the cathode of the collective output end, specifically, the cathodes of the PV output ends are uniformly indicated to be connected with the cathode of the collective output end, specifically, the cathodes of the PV output ends are respectively connected to the cathode of the collective output end, or the cathodes of the PV output ends are sequentially connected, and then the connected line is connected to the cathode of the collective output end, which is not limited in the present invention.
The dc bus may include a positive line and a negative line, and in this optional embodiment, the positive electrode of the collective output end is connected to the positive line of the dc bus; the negative line of the dc bus may be grounded, and the dc bus may be connected to a load, which is not limited in the present invention. The negative pole of the set output end is respectively connected to the negative poles of the PU input ends of the plurality of PU devices, namely the indication set output end is respectively connected with the negative pole of the PU input end of each PU device. Fig. 5 is a system schematic diagram (ii) of a solar power supply system according to an embodiment of the present invention, and the connection relationship between components in the solar power supply system in the above alternative embodiment is as shown in fig. 5.
According to the technical scheme described in the optional embodiment, since the PV assemblies are connected in parallel first, that is, a PV assembly set is formed, and then the PV assembly set is uniformly connected with the PU devices, the cable layout between the PV assemblies and the PU assemblies is not only reduced in number and reduced in cost compared with the cable layout in which the PV assemblies and the PU assemblies are connected one by one in the related art; in the construction process, cables can be connected to the PV assemblies on one side of the PV assemblies, namely PV output ends of the PV assemblies are converged to a set output end of a PV assembly set, and cables are distributed on one side of the PU devices, namely the set output ends are respectively connected with PU input ends of the PU devices; the construction mode can lead the cables to be respectively wired at a plurality of PV component sides and a plurality of PU device sides in the cable layout, thereby obviously reducing the construction complexity.
It should be further noted that the connection between the PV modules and the PU device is established in the internal structure of the PU device in the present embodiment, that is, in the PU device, the DC/DC unit is disposed between the negative pole of the PU input terminal and the negative pole of the PU output terminal. Specifically, the DC/DC unit is disposed between the negative electrode of the PU input terminal and the negative electrode of the PU output terminal, so that the negative electrode of each PU module can independently perform loop control, thereby preventing current from flowing back between the negative electrode of the PU input terminal and the negative electrode of the PU output terminal of a certain PU device after the plurality of PU devices are connected in tandem.
On the other hand, in the solar power supply system in the above optional embodiment, since the plurality of PV modules adopt the tandem, any one PU device may be connected to the PV module through the collective output terminal; therefore, when designing the system reliability, only the backup processing (N +1 backup) is needed for the PU device, and the backup processing is not needed for the PV module. Compared with the related art in which the PV module and the PU device need to be backed up at the same time, the above-described alternative embodiment can reduce the backup cost in the system operation.
In addition, in the solar power supply system in the optional embodiment, in the later detection process, for the application scenario in which the PV modules output high-voltage direct current, since the plurality of PV modules are connected in a tandem manner, insulation detection is not required to be performed on each PV module, and only the collection output ends corresponding to the PV module assemblies after the tandem connection are required to be subjected to insulation detection, so that the detection cost can be further reduced.
In an optional embodiment, a first protection unit 110 is disposed between the positive pole of the set input end and the negative pole of the set input end;
the first protection unit 110 includes a first protection resistor disposed between the positive pole of the set input terminal and the negative pole of the set input terminal.
It should be further noted that, in the above optional embodiment, the PV assemblies and the PU devices are connected through the set output end of the PV assembly set, and the PU devices are respectively connected in parallel with the set output end, so that the direct current lightning protection for the PU devices can be implemented by arranging the protection unit between the positive electrode of the set output end and the negative electrode of the set input end. Compared with the related art in which each PU module is provided with a protection unit respectively, the technical solution in the above optional embodiment obviously reduces the number of protection units, i.e., the first protection resistors, thereby significantly reducing the device cost in the setting process of the PU device.
The first protection resistor may be a varistor.
In an optional embodiment, the solar power supply system further includes:
a control unit configured to instruct one or more of the plurality of PU devices to sleep according to a load current to which the DC bus is connected.
It should be further noted that, the control unit in the above-mentioned alternative embodiment may be a control unit of the PU device, and may also be an overall control unit of the solar power supply system, such as a CPU or a microcomputer, and the present invention is not limited thereto. By adopting the scheme in the optional embodiment, under the condition that the load current connected with the direct current bus is low, one or more corresponding PU devices can drive the load to work, for example, the output current of one PU device is 50A, and the current actually required by the load is 30A, then one PU device can drive the load, at this time, if a plurality of PU devices work simultaneously, that is, a plurality of PU devices output according to the current sharing, the output current of each PU device is 30/N (N is the number of PU devices), and further the current output by each PU device is small. Because the conversion efficiency of the PU device is different at different load points, and the conversion efficiency of the PU device is higher than that of other load points in a partial load interval, the conversion efficiency of the PU device is higher than that of other load points; by adopting the sleep control of the PU device in the above optional embodiment, the output current of the PU device can be controlled, so that the PU device has the optimal conversion efficiency in the working state.
In an alternative embodiment, the negative terminal of each PU input terminal is further provided with a first PU input switch 112.
In an alternative embodiment, the PV module includes a PV output; and the PV output end of each PV assembly is respectively connected to the PU input end of the PU device corresponding to the PV assembly.
It should be further noted that, in the above optional embodiment, the PV assemblies are independent from each other, each PV assembly corresponds to a PU device, and a mode that an anode of the PV output is connected to an anode of the PU input and a cathode of the PV output is connected to a cathode of the PU input between the PV output of the PV assembly and the PU input corresponding to the PU device may be adopted. Fig. 6 is a schematic system diagram (iii) of a solar power supply system provided according to an embodiment of the present invention, and the structure of the solar power supply system in the above-described alternative embodiment may refer to fig. 6.
In an optional embodiment, a second protection unit 114 is disposed between the positive electrode of the PU input end and the negative electrode of the PU input end of each PU device;
the second protection unit comprises a second protection resistor arranged between the anode of the PU input end and the cathode of the PU input end.
It should be further noted that, in the related art, since the positive electrode and the negative electrode of the output end of the PV module are respectively connected to the positive electrode and the negative electrode of the input end of the corresponding PU device, when the dc lightning protection module of the PU device is disposed, a grounded protection resistor needs to be disposed for the positive electrode and the negative electrode respectively.
In the above optional embodiment, the PU input end corresponding to each PU device is provided with a second protection unit, and the second protection unit is a second protection resistor. The arrangement of the above-mentioned alternative embodiment is based on the structure of the solar power supply system in this embodiment; specifically, in the PU device in this embodiment, the DC/DC unit in the PU device is disposed between the negative electrode of the PU input terminal and the negative electrode of the PU output terminal, and therefore, the DC lightning protection process can be implemented by disposing a protection resistor between the positive electrode and the negative electrode of the PU input terminal. Obviously, in the solution in the above alternative embodiment, the number of the protection resistors is 1/2 of the number of the protection resistors in the related art, so that the device cost in the PU device setup process can be significantly reduced.
The second protection resistor may also be a varistor.
In an alternative embodiment, a second PU input switch 116 is further disposed at the positive pole of each PU input, and a third PU input switch 118 is further disposed at the negative pole of each PU input.
In an alternative embodiment, the DC/DC unit 106 includes: the MOS transistor comprises a first MOS transistor, a second MOS transistor, a third MOS transistor and a fourth MOS transistor;
the first MOS tube and the second MOS tube are arranged between the negative electrode of the PU input end and the negative electrode of the PU output end, the third MOS tube is arranged between the first MOS tube and the positive electrode of the PU output end, and the fourth MOS tube is arranged between the second MOS tube and the positive electrode of the PU output end;
still be provided with first inductance between the negative pole of first MOS pipe and PU output, still be provided with the second inductance between the negative pole of second MOS pipe and PU output.
It should be further noted that fig. 7 is a circuit schematic diagram of a DC/DC unit provided according to an embodiment of the present invention, and the internal circuit configuration of the DC/DC unit is shown in fig. 7. On the basis of the internal circuit structure of the DC/DC unit shown in fig. 7, the internal structure of the solar power supply system in different situations can be further supplemented, fig. 8 is a schematic circuit diagram (i) of the solar power supply system provided according to the embodiment of the present invention, and fig. 8 corresponds to the solar power supply system in fig. 5, that is, the layout manner of the plurality of PV modules in the collection. Fig. 9 is a schematic circuit diagram (ii) of a solar power supply system according to an embodiment of the present invention, and fig. 9 corresponds to the solar power supply system in fig. 6, i.e., the PV modules and the PU devices are arranged in a one-to-one correspondence manner. It should be further noted that the circuit configurations of the DC/DC units inside the PU devices in fig. 8 and 9 are shown in fig. 7.
Example 2
The present embodiment further provides a control method of a solar power supply system, where the control method is applied to the solar power supply system in embodiment 1, fig. 10 is a flowchart of the control method of the solar power supply system according to the embodiment of the present invention, and as shown in fig. 10, the control method of the solar power supply system includes:
and S202, transforming voltage between a PU input end and a PU output end of the PU device through a switch unit so as to perform Maximum Power Point Tracking (MPPT) control on the solar power supply system.
In an optional embodiment, the solar control system includes: an input current detection unit and an output current detection unit; the step S202 further includes:
detecting the input current of the PU input end according to the input current detection unit to obtain first detection information, and detecting the output current of the PU output end according to the output current detection unit to obtain second detection information;
the transformation is realized between the PU input end and the PU output end of the PU device through the switch unit according to the first detection information and the second detection signal, so that the maximum power point tracking MPPT control is carried out on the solar power supply system.
It should be further noted that the first detection information is a detection result of the input current at the input terminal of the PU device by the input current detection unit, and the second detection information is a detection result of the output current at the output terminal of the PU device by the output current detection unit. According to the first detection information and the second detection information, the DC/DC unit can perform transformation processing so as to further improve loop control in the PU device and MPPT control of the PV assembly. In an alternative embodiment, the input current detection unit is formed by a first detection resistor, and the output current detection unit is formed by a second electrical detection resistor.
In an optional embodiment, the method further includes:
one or more of the plurality of PU devices are instructed to sleep based on a load current to which the DC bus is connected.
It should be further noted that, in the above optional embodiment, in a situation that a load current connected to the dc bus is low, one or more corresponding PU devices may drive the load to operate, for example, if an output current of one PU device is 50A, and a current actually required by the load is 30A, then one PU device may drive the load, and at this time, if multiple PU devices operate simultaneously, that is, multiple PU devices output according to a current sharing, an output current of each PU device is 30/N (N is the number of PU devices), thereby causing the current output by each PU device to be small. Because the conversion efficiency of the PU device is different at different load points, and the conversion efficiency of the PU device is higher than that of other load points in a partial load interval, the conversion efficiency of the PU device is higher than that of other load points; by adopting the sleep control of the PU device in the above optional embodiment, the output current of the PU device can be controlled, so that the PU device has the optimal conversion efficiency in the working state.
Through the above description of the embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but the former is a better implementation mode in many cases.
Example 3
In this embodiment, a control device of a solar power supply system is further provided, where the control device is applied to the solar power supply system described in embodiment 1, and the device is used to implement the above embodiments and preferred embodiments, and the description of the device is omitted. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated.
Fig. 11 is a block diagram of a control device of a solar power supply system according to an embodiment of the present invention, and as shown in fig. 11, the device includes:
the control module 301 is configured to implement voltage transformation between a PU input end and a PU output end of the PU device through the switch unit, so as to perform maximum power point tracking MPPT control on the solar power supply system.
In an optional embodiment, the solar control system includes: an input current detection unit and an output current detection unit; the above-mentioned device still includes:
detecting the input current of the PU input end according to the input current detection unit to obtain first detection information, and detecting the output current of the PU output end according to the output current detection unit to obtain second detection information;
the transformation is realized between the PU input end and the PU output end of the PU device through the switch unit according to the first detection information and the second detection signal, so that the maximum power point tracking MPPT control is carried out on the solar power supply system.
In an optional embodiment, the apparatus further comprises:
one or more of the plurality of PU devices are instructed to sleep based on a load current to which the DC bus is connected.
It should be noted that, the above modules may be implemented by software or hardware, and for the latter, the following may be implemented, but not limited to: the modules are all positioned in the same processor; alternatively, the modules are respectively located in different processors in any combination.
Example 4
Embodiments of the present invention also provide an electronic device comprising a memory having a computer program stored therein and a processor arranged to run the computer program to perform the steps of any of the above method embodiments.
Optionally, the electronic apparatus may further include a transmission device and an input/output device, wherein the transmission device is connected to the processor, and the input/output device is connected to the processor.
Optionally, in this embodiment, the processor may be configured to execute the following steps by a computer program:
and S1, transforming voltage between the PU input end and the PU output end of the PU device through the switch unit so as to perform Maximum Power Point Tracking (MPPT) control on the solar power supply system.
Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments and optional implementation manners, and this embodiment is not described herein again.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the principle of the present invention should be included in the protection scope of the present invention.

Claims (16)

1. A solar powered system, comprising: a photovoltaic PV assembly and a DC bus; wherein, PV subassembly correspondence is provided with power supply unit PU device, the PU device includes:
a PU input end configured to be connected to the PV module;
the PU output end is connected with the direct current bus;
and the direct-current chopping DC/DC unit is arranged between the negative pole of the PU input end and the negative pole of the PU output end, and the DC/DC unit is configured to realize voltage transformation between the PU input end and the PU output end.
2. The system of claim 1, wherein the PU device further comprises:
an input current detection unit configured to detect an input current of the PU input, the input current detection unit being disposed between a negative electrode of the PU input and the DC/DC unit;
an output current detection unit configured to detect an output current of the PU output, the output current detection unit being disposed between a negative electrode of the PU output and the DC/DC unit.
3. The system according to claim 1 or 2, comprising a set of PV assemblies, wherein a plurality of the PV assemblies are included in the set of PV assemblies; each PV assembly in the PV assembly set is correspondingly provided with a PU device.
4. The system according to claim 3, wherein the set of PV assemblies includes a set output, the PV assemblies including a PV output; wherein the positive poles of the PV outputs of the plurality of PV modules are tied to the positive pole of the collective output and the negative poles of the PV outputs of the plurality of PV modules are tied to the negative pole of the collective output;
the positive pole of the set output end is connected to the direct current bus, and the negative pole of the set output end is respectively connected to the negative poles of the PU input ends in the PU devices.
5. The system of claim 4, wherein a first protection unit is disposed between the positive pole of the collective input terminal and the negative pole of the collective input terminal;
wherein the first protection unit comprises a first protection resistor arranged between the positive pole of the set input terminal and the negative pole of the set input terminal.
6. The system of claim 4, further comprising:
a control unit configured to instruct one or more of the PU devices to sleep according to a load current connected to the DC bus.
7. The system of claim 4, wherein the negative terminal of each of the PU inputs is further provided with a first PU input switch.
8. The system of claim 3, wherein the PV module comprises a PV output; wherein the PV output end of each PV assembly is respectively connected to the PU input end of the PU device corresponding to the PV assembly.
9. The system according to claim 8, wherein a second protection unit is disposed between the positive pole of the PU input and the negative pole of the PU input of each of the PU devices;
the second protection unit comprises a second protection resistor arranged between the anode of the PU input end and the cathode of the PU input end.
10. The system of claim 8, wherein the positive pole of each of the PU inputs is further provided with a second PU input switch, and the negative pole of each of the PU inputs is further provided with a third PU input switch.
11. The system of claim 1, wherein the DC/DC unit comprises: the MOS transistor comprises a first MOS transistor, a second MOS transistor, a third MOS transistor and a fourth MOS transistor;
the first MOS tube and the second MOS tube are arranged between the negative electrode of the PU input end and the negative electrode of the PU output end, the third MOS tube is arranged between the first MOS tube and the positive electrode of the PU output end, and the fourth MOS tube is arranged between the second MOS tube and the positive electrode of the PU output end;
first MOS pipe with still be provided with first inductance between the negative pole of PU output, the second MOS pipe with still be provided with the second inductance between the negative pole of PU output.
12. The system of claim 2, wherein the input current detection unit is comprised of a first detection resistor and the output current detection unit is comprised of a second electrical detection resistor.
13. A control method of a solar power supply system, characterized by being applied to the solar power supply system described in any one of claims 1 to 12; the method comprises the following steps:
and realizing voltage transformation between the PU input end and the PU output end of the PU device through the DC/DC unit so as to carry out Maximum Power Point Tracking (MPPT) control on the solar power supply system.
14. The method of claim 13, wherein the solar control system comprises: an input current detection unit and an output current detection unit; the method further comprises the following steps:
detecting the input current of the PU input end according to the input current detection unit to obtain first detection information, and detecting the output current of the PU output end according to the output current detection unit to obtain second detection information;
and realizing voltage transformation between the PU input end and the PU output end of the PU device through the DC/DC unit according to the first detection information and the second detection signal so as to carry out Maximum Power Point Tracking (MPPT) control on the solar power supply system.
15. The method of claim 13, further comprising:
instructing one or more of the plurality of PU devices to sleep according to a load current to which the DC bus is connected.
16. A control device of a solar power supply system, which is applied to the solar power supply system described in any one of claims 1 to 12; the device comprises:
the control module is configured to realize voltage transformation between the PU input end and the PU output end of the PU device through the DC/DC unit so as to perform Maximum Power Point Tracking (MPPT) control on the solar power supply system.
CN201911358901.7A 2019-12-25 2019-12-25 Solar power supply system, and control method and device of solar power supply system Pending CN113031693A (en)

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