CN111181237A - Photovoltaic control method, photovoltaic power supply device and system - Google Patents
Photovoltaic control method, photovoltaic power supply device and system Download PDFInfo
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- CN111181237A CN111181237A CN202010014714.3A CN202010014714A CN111181237A CN 111181237 A CN111181237 A CN 111181237A CN 202010014714 A CN202010014714 A CN 202010014714A CN 111181237 A CN111181237 A CN 111181237A
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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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- 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
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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 embodiment of the invention provides a photovoltaic control method, a photovoltaic power supply device and a photovoltaic power supply system, relates to the field of new energy, and is used for improving the utilization efficiency of the photovoltaic power supply device and avoiding the waste of photovoltaic energy. The method comprises the following steps: the photovoltaic power supply device obtains system parameters; the system parameters comprise a first power and a second power, the first power is input power of the photovoltaic controller, and the second power is power of the communication load; if the first power is smaller than the second power, adjusting the first power and the third power according to a preset algorithm to enable the third power to be maximum; the preset algorithm is used for adjusting the input voltage, the input current, the output voltage and the output current of the photovoltaic controller, and the third power is the output power of the photovoltaic controller. The photovoltaic power supply system is used for the photovoltaic power supply system.
Description
Technical Field
The invention relates to the field of new energy, in particular to a photovoltaic control method, a photovoltaic power supply device and a photovoltaic power supply system.
Background
The communication machine room of the network operator generally uses-48V direct current voltage for power supply, and the power supply can be realized through a switch power supply or through the combination of photovoltaic energy and the switch power supply. The switching power supply supplies power to the communication machine room by converting alternating current commercial power into-48V direct current; the photovoltaic energy and the switch power supply are used for supplying power jointly, the direct current output of the solar battery can be inverted into alternating current and then connected to a mains supply power grid, and then the switch power supply supplies power to the communication machine room, or the direct current output of the solar battery can be converted by the photovoltaic controller and then directly supplies power to the communication machine room.
When the photovoltaic energy is connected to a commercial power grid through inversion to supply power to the communication machine room, the direct current output of the solar battery needs to be subjected to inversion and rectification, the energy conversion efficiency is low, and the investment is high. When the photovoltaic energy supplies power to the communication machine room through the photovoltaic controller, because the Maximum Power Point Tracking (MPPT) of the traditional photovoltaic controller only focuses on the maximum output power of the solar panel, rather than the maximum output power after the power conversion of the photovoltaic controller, the photovoltaic controller adopting the traditional MPPT technology cannot keep the maximum output power to supply power to the communication machine room when supplying power to the communication machine room.
Disclosure of Invention
The embodiment of the invention provides a photovoltaic control method, a photovoltaic power supply device and a photovoltaic power supply system, which are used for improving the utilization efficiency of the photovoltaic power supply device and avoiding the waste of photovoltaic energy.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
in a first aspect, a photovoltaic control method is provided, which is applied to a photovoltaic power supply system, where the photovoltaic power supply system includes a dc bus, and a photovoltaic power supply device and a switching power supply device that are connected to the dc bus, and the photovoltaic power supply device includes a photovoltaic controller, including: the photovoltaic power supply device obtains system parameters; the system parameters comprise a first power and a second power, the first power is input power of the photovoltaic controller, and the second power is power of the communication load; if the first power is smaller than the second power, adjusting the first power and the third power according to a preset algorithm to enable the third power to be maximum; the preset algorithm is used for adjusting the input voltage, the input current, the output voltage and the output current of the photovoltaic controller, and the third power is the output power of the photovoltaic controller.
In a second aspect, a photovoltaic power supply apparatus is provided, including: the acquisition module is used for acquiring system parameters; the system parameters comprise a first power and a second power, the first power is input power of the photovoltaic controller, and the second power is power of the communication load; the adjusting module is used for adjusting the first power and the third power according to a preset algorithm to enable the third power to be maximum when the first power acquired by the acquiring module is smaller than the second power; the preset algorithm is used for adjusting the input voltage, the input current, the output voltage and the output current of the photovoltaic controller, and the third power is the output power of the photovoltaic controller.
In a third aspect, a photovoltaic power supply system is provided, including: the photovoltaic power supply device is used for converting solar energy into electric energy and supplying power to a communication load; the switching power supply device is used for supplying power to the communication load and charging the storage battery pack; the direct current bus is used for transmitting the electric energy of the photovoltaic power supply device and the switching power supply device to the storage battery pack and the communication load; and the storage battery pack is used for storing energy and supplying power to the communication load when the switching power supply device is powered off.
The embodiment of the invention provides a photovoltaic control method, a photovoltaic power supply device and a photovoltaic power supply system, wherein the method comprises the following steps: the photovoltaic power supply device obtains system parameters; the system parameters comprise a first power and a second power, the first power is input power of the photovoltaic controller, and the second power is power of the communication load; if the first power is smaller than the second power, adjusting the first power and the third power according to a preset algorithm to enable the third power to be maximum; the preset algorithm is used for adjusting the input voltage, the input current, the output voltage and the output current of the photovoltaic controller, and the third power is the output power of the photovoltaic controller. According to the embodiment of the invention, the output power value of the photovoltaic controller is the maximum value by adjusting the input voltage, the input current, the output voltage and the output current of the photovoltaic controller, so that the photovoltaic controller always supplies power to the communication load at the maximum utilization efficiency, the photovoltaic utilization efficiency of the photovoltaic power supply device is improved, and the waste of photovoltaic energy is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a photovoltaic power supply system according to an embodiment of the present invention;
fig. 2 is a first schematic flow chart of a photovoltaic control method according to an embodiment of the present invention;
fig. 3 is a schematic diagram of transmission efficiency of a photovoltaic controller according to an embodiment of the present invention;
fig. 4 is a schematic flow chart of a photovoltaic control method according to an embodiment of the present invention;
fig. 5 is a third schematic flow chart of a photovoltaic control method according to an embodiment of the present invention;
fig. 6 is a first schematic structural diagram of a photovoltaic power supply apparatus according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a photovoltaic power supply apparatus according to an embodiment of the present invention.
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, in the embodiments of the present invention, words such as "exemplary" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "exemplary" or "e.g.," an embodiment of the present invention is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.
It should be noted that, in the embodiments of the present invention, "of", "corresponding" and "corresponding" may be sometimes used in combination, and it should be noted that, when the difference is not emphasized, the intended meaning is consistent.
For the convenience of clearly describing the technical solutions of the embodiments of the present invention, in the embodiments of the present invention, the words "first", "second", and the like are used for distinguishing the same items or similar items with basically the same functions and actions, and those skilled in the art can understand that the words "first", "second", and the like are not limited in number or execution order.
At present, a photovoltaic controller in a photovoltaic power supply system takes the output voltage and the output current of a solar panel as control objects, and the output power of the solar panel is maximized according to an MPPT algorithm. However, when the photovoltaic controller transmits the electric energy of the solar panel backward, due to the influence of the transmission efficiency of the photovoltaic controller, the input power of the photovoltaic controller may be maximized, while the output power is not necessarily maximized, thereby influencing the power supply efficiency of the photovoltaic power supply system.
In view of the above problem, as shown in fig. 1, an embodiment of the present invention provides a photovoltaic power supply system, including: the photovoltaic power supply device 01, the switching power supply device 02, the direct current bus 03, the storage battery 04 and the communication load 05.
Referring to fig. 1, the output terminal of the photovoltaic power supply device 01 and the output terminal of the switching power supply device 02 are connected to a dc bus 03, the input terminal of the storage battery 04 and the input terminal of the communication load 05 are connected to the dc bus 03, and the photovoltaic power supply device 01 and the switching power supply device 02 transmit electric energy to the storage battery 04 and the communication load 05 through the dc bus 03. Note that the voltages at the positions on the dc bus 03 are the same.
The photovoltaic power supply device 01 is used for converting solar energy into electric energy and supplying power to the communication load 05; a switching power supply device 02 for supplying power to the communication load 05 and charging the battery pack 04; the direct-current bus 03 is used for transmitting electric energy of the photovoltaic power supply device 01 and the switching power supply device 02 to the storage battery 04 and the communication load 05; the battery pack 04 is used for storing energy and supplying power to the communication load 05 when the switching power supply device 02 is powered off.
Specifically, the generated power of the photovoltaic power supply device 01 is smaller than the power of the communication load 05, when the communication load 05 is not changed, the photovoltaic power supply device 01 cannot supply power to the communication load 05 alone, the photovoltaic power supply device 01 and the switching power supply device 02 or the storage battery 04 can supply power to the communication load 05 together, or the communication load 05 can be supplied power only through the switching power supply device 02.
Optionally, the photovoltaic power supply apparatus 01 includes a solar panel 011, a photovoltaic controller 012, a first monitoring module 013 and a turn-off switch 014, and the switching power supply apparatus 02 includes a utility power 021, a rectification device 022 and a second monitoring module 023.
Specifically, the solar panel 011 is configured to convert solar energy into electric energy and supply power to the communication load 05 under the control of the photovoltaic controller 012.
The photovoltaic controller 012 is configured to adjust the output current and the output voltage of the solar panel 011, and adjust the output current and the output voltage of the photovoltaic controller, so that the photovoltaic power supply apparatus 01 can output electric energy with the maximum output efficiency while continuously supplying power to the communication load 05.
The first monitoring module 013 is configured to obtain system parameters; the system parameters include an input current, an input voltage, an output current, an output voltage, and an input current of the communication load of the photovoltaic controller 012.
The first monitoring module 013 is further configured to control a switch that can turn off the switch 014, and is in communication with the photovoltaic controller 012.
Optionally, the system parameters further include a starting voltage of the photovoltaic controller 012 and a line resistance between the photovoltaic controller 012 and the dc bus 03.
And the mains supply 021 is used for charging the storage battery pack 04 and supplying power to the communication load 05.
And the rectifying device 022 is used for converting alternating current of the mains supply 021 into direct current, providing charging voltage for the storage battery pack 04 and supplying power to the communication load 05.
And a second monitoring module 023 configured to obtain the dc bus voltage and the input current of the battery pack 04, and communicate with the rectifying device 022.
According to the above photovoltaic power supply system, as shown in fig. 2, an embodiment of the present invention provides a photovoltaic control method, including:
101. and the photovoltaic power supply device acquires system parameters.
The system parameters comprise a first power and a second power, the first power is input power of the photovoltaic controller, and the second power is power of the communication load.
Specifically, the first monitoring module of the photovoltaic power supply device may obtain system parameters of the photovoltaic power supply device, where the system parameters further include an input voltage, an input current, an output voltage, and an output current of the photovoltaic controller. The first power is input power of the photovoltaic controller and also can be output power of the solar panel, and the first power can be determined by input current and input voltage of the photovoltaic controller. The second power is the power of the communication load, and the second power can be acquired by a first monitoring module of the photovoltaic power supply device.
102. And if the first power is smaller than the second power, adjusting the first power and the third power according to a preset algorithm to enable the third power to be maximum.
The preset algorithm is used for adjusting input voltage, input current, output voltage and output current of the photovoltaic controller, and the third power is output power of the photovoltaic controller.
Specifically, if the first power is smaller than the second power, the output current of the photovoltaic power supply device is constantly smaller than the input current required by the communication load, and at this time, the photovoltaic power supply device can be controlled to output electric energy at the maximum power, so that the utilization efficiency of the photovoltaic power supply device is improved.
Optionally, when the first power is smaller than the second power, step 102 provided in the embodiment of the present invention may be specifically implemented as:
and if the output current of the photovoltaic controller is greater than zero, adjusting the input voltage, the input current, the output voltage and the output current of the photovoltaic controller according to a preset algorithm to enable the third power to be maximum.
Specifically, the preset algorithm may be a variable step self-optimizing algorithm. As shown in fig. 3, since the photovoltaic controllers have different transmission efficiencies when the input voltages are different, the third power of the photovoltaic controller may not reach the maximum value when the first power is maximum, and the embodiment of the present invention is actually an adjustment of the input voltage, the input current, the output voltage, and the output current of the photovoltaic controller so that the third power is maximum. If the first power is 100W and the transmission efficiency of the photovoltaic controller is 0.98, the third power is 98W; if the first power is 99W and the transmission efficiency of the photovoltaic controller is 0.99, the third power is 98.01W, and it can be seen that the third power is not necessarily the maximum when the first power is the maximum. Therefore, the embodiment of the invention determines the maximum third power by continuously adjusting the input voltage, the input current, the output voltage and the output current of the photovoltaic controller through the variable step self-optimization algorithm.
The process that the photovoltaic controller determines the third power maximum value according to the preset algorithm specifically comprises the following steps:
when the photovoltaic controller normally outputs, the input voltage U of the photovoltaic controller is continuously increased according to the first step lengthSAnd determining different input voltages U through the first monitoring moduleSCorresponding input current ISTo determine different input voltages USInput power to the lower photovoltaic controller. E.g. input voltage USWhen the voltage is 10V, the input power corresponding to the photovoltaic controller is 100W, and when the input voltage is 11V, the input power corresponding to the photovoltaic controller is 99W, and so on. By continuously adjusting the input voltage U of the photovoltaic controllerSThe first monitoring module may determine that the photovoltaic controller is at each input voltage USThe corresponding input power.
When determining that the photovoltaic controller is at each input voltage USAt corresponding input power, the output voltage U of the photovoltaic controller is adjustedODetermining a variation range of output power corresponding to the input power of the photovoltaic controller, wherein the output power of the photovoltaic controller can vary from 80W to 98W if the input power of the photovoltaic controller is 100W; when the input power of the photovoltaic controller is 99W, the output power of the photovoltaic controller can be changed between 77W and 98.01W according to different acquired photovoltaic controllersThe method comprises the steps of determining the maximum value of output power according to the output power range corresponding to input power, and setting the input voltage, the input current, the output voltage and the output current of the photovoltaic controller as the input voltage, the input current, the output voltage and the output current corresponding to the maximum value of the input power. The process of determining the output power variation range of the photovoltaic controller may be as follows:
increasing the output voltage U of the photovoltaic controller by a second step size when the input power of the photovoltaic controller is determinedOThen the corresponding output current I of the photovoltaic controller at this timeOChanging, a first monitoring module in the photovoltaic power supply device acquires and obtains the output voltage U of the photovoltaic controller at the momentOAnd an output current IOThereby obtaining new output power of the photovoltaic controller. If the new output power is increased, the output voltage U of the photovoltaic controller is continuously increased according to the second step lengthOThereby constantly updating the third power.
When the photovoltaic controller increases the output voltage U according to the second step lengthOAnd if the first monitoring module detects that the output power of the photovoltaic controller is reduced, reducing the output voltage U of the photovoltaic controller according to a third step lengthOIf the output power of the photovoltaic controller is increased at the moment, the output voltage U of the photovoltaic controller is continuously reduced by the third step lengthOAnd acquiring new output power of the photovoltaic controller.
When the output voltage U of the photovoltaic controllerOWhen the output power of the photovoltaic controller is reduced according to the third step length, stopping the output voltage U of the photovoltaic controllerOTo maximize the output power of the photovoltaic controller. Of course, the output voltage U of the photovoltaic controller is described aboveOWhen the adjustment is carried out according to the second step length and the third step length, the minimum value of the output power of the photovoltaic controller can be determined, and then the change range of the output power of the photovoltaic controller is determined when the input power of the photovoltaic controller is constant.
The output voltage U of the photovoltaic controller is adjustedOThe process of calculating the maximum output power of the photovoltaic controller is actually to transform the output voltage of the photovoltaic controller according to a variable step self-optimization algorithmUOTo determine the maximum output power of the photovoltaic controller, i.e. the course of the third power. The above gives an increase of the output voltage U according to the second step sizeODecreasing the output voltage U according to the third step lengthOIn practice, the person skilled in the art can also adjust the output voltage U of the photovoltaic controller according to the second step size and the third step sizeOThen, setting the fourth step length and the fifth step length to the output voltage U of the photovoltaic controllerOAnd adjusting to enable the output power of the photovoltaic controller to be closer to the maximum value.
It should be noted that, in the embodiment of the present invention, the acquisition period of the system parameter is short, so that the dc bus voltage U can be obtainedBConsidered constant. Meanwhile, the second step length is larger than the third step length, for example, the second step length is 0.3V, and the third step length is 0.1V; of course, if the fourth step length and the fifth step length are set again, the output voltage U of the photovoltaic controller is adjustedOAnd then, the fourth step length is smaller than the third step length, the fifth step length is smaller than the fourth step length, wherein the fourth step length is used for increasing the output voltage U of the photovoltaic controllerOAnd the fifth step size is used for reducing the output voltage U of the photovoltaic controllerO。
The above contents show that when the photovoltaic power supply system is in the floating charge state or the uniform charge state, the output voltage U of the photovoltaic controllerOThe method of (3). When the photovoltaic power supply system is in a discharging state, the photovoltaic power supply device and the storage battery pack jointly supply power to the communication load, and at the moment, the direct-current bus voltage UBAlong with the gradual reduction of the discharge of the storage battery pack, the output voltage U of the photovoltaic controller is controlled to meet the constant-power discharge of the storage battery packOAlso following the DC bus voltage UBIs reduced.
It is noted that the output voltage U of the photovoltaic controllerOIs less than the DC bus voltage UBReduced speed to avoid the output voltage U of the photovoltaic controllerOThe voltage when the direct current bus is connected is less than the voltage U of the direct current busBSo that the photovoltaic power supply device cannot supply power to the communication load. When the DC bus voltage UBWhen the voltage drops to the cut-off voltage, the storage battery pack andthe photovoltaic power supply device stops supplying power to the communication load, and the cut-off voltage is the lowest working voltage of the storage battery pack and is used for preventing the storage battery pack from being damaged due to over-discharge of the storage battery pack.
Input voltage U of the photovoltaic controllerSThe output voltage of the solar panel and the input current I of the photovoltaic controllerSIs the output current of the solar panel.
Optionally, as shown in fig. 4, the photovoltaic control method provided in the embodiment of the present invention further includes:
103. and if the first power is greater than the second power, the output current of the photovoltaic controller is less than the preset current, and the output voltage is less than the preset voltage, increasing the output voltage of the photovoltaic controller to the floating charge voltage.
The preset current is the sum of the input current of the communication load and the input current of the storage battery pack, the preset voltage is a value slightly larger than the floating charge voltage, and the floating charge voltage is the voltage of the storage battery pack in a floating charge state.
Specifically, when the equipment of the communication machine room is moved, the second power is reduced, so that the first power is larger than the second power, the switching power supply device can stop supplying power to the communication load, the photovoltaic power supply device supplies power to the communication load independently, and the storage battery pack is in a floating state.
When the output current I of the photovoltaic controllerOLess than the predetermined current and outputting a voltage UOWhen the voltage is less than the preset voltage, the output voltage U of the photovoltaic controller can be controlledOIncreasing to a preset voltage. When it is noted that the output voltage U of the photovoltaic controller is zeroOWhen increasing, the output current IOThe value of (b) should be always greater than the input current of the communication load and less than the preset current, so that the photovoltaic power supply device can meet the power supply requirement of the communication load and the storage battery pack is in a floating charge state.
The reason why the preset voltage is slightly larger than the floating charge voltage is that a resistor exists between the photovoltaic controller and the direct current bus, and the output voltage U of the photovoltaic controllerOWhen the direct current bus is connected, the voltage difference exists, so that the output voltage after the photovoltaic controller is controlled to be adjusted can be slightly largerAt a floating voltage.
104. And when the output voltage of the photovoltaic controller is greater than the preset voltage, reducing the output voltage of the photovoltaic controller to the preset voltage.
Specifically, if the first power is greater than the second power, and the output voltage U of the photovoltaic controller is greater than the second powerOIf the voltage is greater than the preset voltage, the output voltage U of the photovoltaic controller is adjustedOReduce to preset voltage and avoid output voltage U of photovoltaic controllerOToo large causes overcharging of the battery pack.
Optionally, the system parameter further includes a starting voltage of the photovoltaic controller, and the photovoltaic power supply device further includes a turn-off switch. As shown in fig. 5, the photovoltaic control method provided in the embodiment of the present invention further includes:
105. and if the input voltage of the photovoltaic controller is less than the starting voltage but greater than the voltage of the direct-current bus, controlling the turn-off switch to be closed.
The starting voltage is the lowest working voltage of the photovoltaic controller.
Specifically, the photovoltaic controller has the lowest working voltage, and if the input voltage of the photovoltaic controller is lower than the lowest working voltage, the photovoltaic controller cannot work, and the photovoltaic power supply device cannot supply power to the communication load, so that the photovoltaic energy is wasted.
The photovoltaic power supply device comprises a turn-off switch, and if the input voltage of the photovoltaic controller is lower than the starting voltage but higher than the voltage U of the direct current busBAnd then the turn-off switch is controlled to be closed, so that the photovoltaic power supply device directly supplies power for the communication load through the solar panel, and the waste of photovoltaic energy is avoided.
The embodiment of the invention provides a photovoltaic control method, which comprises the following steps: the photovoltaic power supply device obtains system parameters; the system parameters comprise a first power and a second power, the first power is input power of the photovoltaic controller, and the second power is power of the communication load; if the first power is smaller than the second power, adjusting the first power and the third power according to a preset algorithm to enable the third power to be maximum; the preset algorithm is used for adjusting the input voltage, the input current, the output voltage and the output current of the photovoltaic controller, and the third power is the output power of the photovoltaic controller. According to the embodiment of the invention, the output power value of the photovoltaic controller is the maximum value by adjusting the input voltage, the input current, the output voltage and the output current of the photovoltaic controller, so that the photovoltaic controller always supplies power to the communication load at the maximum utilization efficiency, the photovoltaic utilization efficiency of the photovoltaic power supply device is improved, and the waste of photovoltaic energy is avoided.
As shown in fig. 6, the embodiment of the present invention provides a photovoltaic power supply apparatus 20, including:
an obtaining module 201, configured to obtain a system parameter; the system parameters include a first power and a second power, the first power is an input power of the photovoltaic controller, and the second power is a power of the communication load.
An adjusting module 202, configured to adjust the first power and the third power according to a preset algorithm to maximize the third power when the first power acquired by the acquiring module 201 is smaller than the second power; the preset algorithm is used for adjusting the input voltage, the input current, the output voltage and the output current of the photovoltaic controller, and the third power is the output power of the photovoltaic controller.
Optionally, the system parameters further include an input voltage, an input current, an output voltage, and an output current of the photovoltaic controller.
The adjusting module 202 is specifically configured to: and if the output current of the photovoltaic controller is greater than zero, adjusting the input voltage, the input current, the output voltage and the output current of the photovoltaic controller according to a preset algorithm to enable the third power to be maximum.
Optionally, the adjusting module 202 is further configured to: when the first power is higher than the second power, the output current of the photovoltaic controller is lower than the preset current, and the output voltage is lower than the preset voltage, the output voltage of the photovoltaic controller is increased to the floating charge voltage; and when the output voltage of the photovoltaic controller is greater than the preset voltage, reducing the output voltage of the photovoltaic controller to the preset voltage.
Optionally, the system parameters further include a starting voltage of the photovoltaic controller and a dc bus voltage, as shown in fig. 7, the photovoltaic power supply further includes a turn-off switch 203.
The adjusting module 202 is further configured to control the turn-off switch 203 to be turned on when the input voltage of the photovoltaic controller is less than the starting voltage but greater than the dc bus voltage; the starting voltage is the lowest working voltage of the photovoltaic controller.
The embodiment of the invention provides a photovoltaic power supply device, which comprises: the acquisition module is used for acquiring system parameters; the system parameters comprise a first power and a second power, the first power is input power of the photovoltaic controller, and the second power is power of the communication load; the adjusting module is used for adjusting the first power and the third power according to a preset algorithm to enable the third power to be maximum when the first power acquired by the acquiring module is smaller than the second power; the preset algorithm is used for adjusting the input voltage, the input current, the output voltage and the output current of the photovoltaic controller, and the third power is the output power of the photovoltaic controller. According to the embodiment of the invention, the output power value of the photovoltaic controller is the maximum value by adjusting the input voltage, the input current, the output voltage and the output current of the photovoltaic controller, so that the photovoltaic controller always supplies power to the communication load at the maximum utilization efficiency, the photovoltaic utilization efficiency of the photovoltaic power supply device is improved, and the waste of photovoltaic energy is avoided.
Those skilled in the art will recognize that, in one or more of the examples described above, the functions described in this invention may be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.
Through the above description of the embodiments, it is clear to those skilled in the art that, for convenience and simplicity of description, the foregoing division of the functional modules is merely used as an example, and in practical applications, the above function distribution may be completed by different functional modules according to needs, that is, the internal structure of the device may be divided into different functional modules to complete all or part of the above described functions.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the modules or units is only one logical function division, and there may be other division ways in actual implementation. For example, various elements or components may be combined or may be integrated into another device, or some features may be omitted, or not implemented. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form. Units described as separate parts may or may not be physically separate, and parts displayed as units may be one physical unit or a plurality of physical units, may be located in one place, or may be distributed to a plurality of different places. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit. The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a readable storage medium. Based on such understanding, the technical solutions of the embodiments of the present application may be essentially or partially contributed to by the prior art, or all or part of the technical solutions may be embodied in the form of a software product, where the software product is stored in a storage medium and includes several instructions to enable a device (which may be a single chip, a chip, or the like) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a U disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A photovoltaic control method is applied to a photovoltaic power supply system, the photovoltaic power supply system comprises a direct current bus, a photovoltaic power supply device and a switching power supply device, the photovoltaic power supply device and the switching power supply device are connected with the direct current bus, the photovoltaic power supply device comprises a photovoltaic controller, and the photovoltaic control method is characterized by comprising the following steps:
the photovoltaic power supply device acquires system parameters; the system parameters comprise a first power and a second power, the first power is input power of the photovoltaic controller, and the second power is power of a communication load;
if the first power is smaller than the second power, adjusting the first power and the third power according to a preset algorithm to enable the third power to be maximum; the preset algorithm is used for adjusting input voltage, input current, output voltage and output current of the photovoltaic controller, and the third power is output power of the photovoltaic controller.
2. The photovoltaic control method of claim 1, wherein the system parameters further comprise an input voltage, an input current, an output voltage, and an output current of the photovoltaic controller; the adjusting the first power and the third power according to a preset algorithm to maximize the third power comprises:
and if the output current of the photovoltaic controller is greater than zero, adjusting the input voltage, the input current, the output voltage and the output current of the photovoltaic controller according to the preset algorithm to enable the third power to be maximum.
3. The photovoltaic control method of claim 2, further comprising:
if the first power is higher than the second power, the output current of the photovoltaic controller is lower than a preset current, and the output voltage is lower than a preset voltage, increasing the output voltage of the photovoltaic controller to a floating charge voltage;
and when the output voltage of the photovoltaic controller is greater than the preset voltage, reducing the output voltage of the photovoltaic controller to the preset voltage.
4. The photovoltaic control method of claim 3, wherein the system parameters further include a start-up voltage of the photovoltaic controller and a dc bus voltage, the photovoltaic power supply further includes a turn-off switch; the photovoltaic control method further includes:
if the input voltage of the photovoltaic controller is smaller than the starting voltage but larger than the voltage of the direct-current bus, controlling the turn-off switch to be turned on; the starting voltage is the lowest working voltage of the photovoltaic controller.
5. A photovoltaic power supply apparatus, comprising:
the acquisition module is used for acquiring system parameters; the system parameters comprise a first power and a second power, the first power is input power of the photovoltaic controller, and the second power is power of the communication load;
the adjusting module is used for adjusting the first power and the third power according to a preset algorithm to enable the third power to be maximum when the first power acquired by the acquiring module is smaller than the second power; the preset algorithm is used for adjusting input voltage, input current, output voltage and output current of the photovoltaic controller, and the third power is output power of the photovoltaic controller.
6. The photovoltaic power supply of claim 5, wherein the system parameters include an input voltage, an input current, an output voltage, and an output current of the photovoltaic controller; the adjustment module is specifically configured to:
and if the output current of the photovoltaic controller is greater than zero, adjusting the input voltage, the input current, the output voltage and the output current of the photovoltaic controller according to the preset algorithm to enable the third power to be maximum.
7. The photovoltaic power supply apparatus of claim 6, wherein the adjustment module is further configured to:
when the first power is higher than the second power, the output current of the photovoltaic controller is lower than a preset current, and the output voltage is lower than a preset voltage, increasing the output voltage of the photovoltaic controller to a floating charge voltage;
and when the output voltage of the photovoltaic controller is greater than the preset voltage, reducing the output voltage of the photovoltaic controller to the preset voltage.
8. The pv power plant according to claim 7 wherein the system parameters further include a startup voltage of the pv controller and a dc bus voltage, the pv power plant further comprising a turn-off switch;
the adjusting module is further used for controlling the turn-off switch to be closed when the input voltage of the photovoltaic controller is smaller than the starting voltage but larger than the voltage of the direct-current bus; the starting voltage is the lowest working voltage of the photovoltaic controller.
9. A photovoltaic power supply system, comprising: the system comprises a photovoltaic power supply device, a switching power supply device, a direct current bus, a storage battery pack and a communication load;
the photovoltaic power supply device is used for converting solar energy into electric energy and supplying power to the communication load;
the switching power supply device is used for supplying power to the communication load and charging the storage battery pack;
the direct-current bus is used for transmitting the electric energy of the photovoltaic power supply device and the switching power supply device to the storage battery pack and the communication load;
and the storage battery pack is used for storing energy and supplying power to the communication load when the switching power supply device is powered off.
10. The photovoltaic power supply system according to claim 9, wherein the photovoltaic power supply device comprises a solar panel, a photovoltaic controller, a first monitoring module and a turn-off switch, and the switching power supply device comprises a mains supply, a rectifying device and a second monitoring module;
the solar panel is used for converting solar energy into electric energy and supplying power to the communication load under the control of the photovoltaic controller;
the photovoltaic controller is used for adjusting the output current and the output voltage of the solar panel and adjusting the output current and the output voltage of the photovoltaic controller, so that the photovoltaic power supply device can output electric energy with the maximum output efficiency while continuously supplying power to the communication load;
the first monitoring module is used for acquiring system parameters; the system parameters include an input current, an input voltage, an output current, an output voltage of the photovoltaic controller, and an input current of the communication load;
the first monitoring module is also used for controlling the switch of the turn-off switch and communicating with the photovoltaic controller;
the commercial power is used for charging the storage battery pack and supplying power to the communication load;
the rectifying equipment is used for converting alternating current of the commercial power into direct current, providing charging voltage for the storage battery pack and supplying power for the communication load;
and the second monitoring module is used for acquiring the direct-current bus voltage and the input current of the storage battery pack and communicating with the rectifying equipment.
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Application publication date: 20200519 |