CN110262620A - Maximum power point tracking system and method in photovoltaic system - Google Patents
Maximum power point tracking system and method in photovoltaic system Download PDFInfo
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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
This application involves the maximum power point tracking system and methods in a kind of photovoltaic system, belong to technical field of photovoltaic power generation, which includes: the photovoltaic module being connected by power converter with load；For acquiring the voltage acquisition component of the current output voltage of photovoltaic module；The controller being connected respectively with voltage acquisition component and power converter, controller obtain the current duty cycle and the collected current output voltage of voltage acquisition component of power converter input current；Current duty cycle and current output voltage are inputted into preset formula, obtain the current output electric current of photovoltaic module；The present output power of photovoltaic module is calculated using current output voltage and current output electric current；It is compared by present output power compared with a upper output power and by current output voltage with a upper output voltage；The duty ratio of input current is adjusted, according to comparison result to track the maximum power point of photovoltaic system；It can simplify the structure of maximum power point tracking system.
Description
Technical field
This application involves the maximum power point tracking system and methods in a kind of photovoltaic system, belong to photovoltaic power generation technology neck
Domain.
Background technique
Battery used in photovoltaic system is mostly silicon solar cell, including monocrystalline silicon, polysilicon and polysilicon membrane electricity
The output in pond, these silion cells has nonlinear characteristic.For example, at the same temperature, with the increase of intensity of illumination, photovoltaic system
The short circuit current of system will increase, open-circuit voltage can rise, peak power output can increase with the increase of intensity of illumination；In temperature
When degree rises, the short circuit current of photovoltaic system does not have significant change, open-circuit voltage will appear significant reduction.
Since the output of photovoltaic system is influenced by temperature, intensity of illumination and load etc., in certain environment temperature and light
According under intensity, photovoltaic system can work in different output voltages.And photovoltaic system its output in a certain output voltage values
Power can be only achieved maximum value, therefore, in photovoltaic system, in order to allow Silicon photrouics work in maximum output power point,
The photovoltaic system needs the operating point according to current intensity of illumination and environment temperature adjustment Silicon photrouics, the mistake of this adjustment
Journey is known as " MPPT maximum power point tracking (Maximum Power Point Tracking, MPPT).
The patent of invention " photovoltaic power converters and closed loop maximum power point tracking " of Publication No. CN 102420523A is public
A kind of power converter and maximum power point tracking technology for being used for photovoltaic (PV) system, the power converter of the PV system are opened
Including the input for being coupled to PV system, the output for providing output voltage and it is coupled between input and output
Switch.Wherein, input is configured to receive input voltage V from PV systeminWith input current Iin。
In above system, power converter needs to configure voltage sensor to acquire input voltage, also to configure electric current
Sensor acquires electric current, this results in the structure of maximum power point tracking system more complicated.
Summary of the invention
This application provides the maximum power point tracking system and method in a kind of photovoltaic system, can solve it is existing most
High-power point tracking system needs to be arranged voltage sensor to acquire the output voltage of photovoltaic module, also need that current sense is arranged
Device acquires the output electric current of photovoltaic module, the problem for causing the structure of the system more complicated.The application provides following technology
Scheme:
In a first aspect, providing the maximum power point tracking system in a kind of photovoltaic system, the maximum power point tracking
System includes:
Photovoltaic module, for converting solar energy into electric energy based on photovoltaic effect, the photovoltaic module passes through power
Converter is connected with load；
The power converter, for realizing the energy transmission between the photovoltaic module and the load；
It is set to the voltage acquisition component of the photovoltaic module output end, the voltage acquisition component is for acquiring the light
Lie prostrate the current output voltage of module；
The controller being connected respectively with the voltage acquisition component and the power converter, the controller is for obtaining
The current duty cycle of the power converter input current and the collected current output voltage of voltage acquisition component；By institute
Current duty cycle and current output voltage input preset formula are stated, the current output electric current of the photovoltaic module is obtained；Make
The present output power of the photovoltaic module is calculated with the current output voltage and the current output electric current；It will be described current
Output power is compared compared with a upper output power and by the current output voltage with a upper output voltage；According to than
Relatively result adjusts the duty ratio of the input current, to track the maximum power point of the photovoltaic system.
Optionally, the controller, is also used to:
The current duty cycle and the current output voltage are inputted into preset formula described, obtain the photovoltaic module
Current output electric current before, obtain the work wave of the power converter；
The work wave is fitted, is obtained using current duty cycle and current output voltage as the default public affairs of variable
Formula.
Optionally, the power converter is flyback converter, and the flyback converter includes transformer；The change
The primary side of depressor includes primary side switch and the primary coil that is connected with the primary side switch, and the secondary side of the transformer includes and institute
The diode stating the secondary coil of primary coil mutual inductance and being connected with the secondary coil；
In primary side switch closure, the electric current in the primary coil increases, and energy is stored in magnetic core；
When the primary side switch disconnects, the electric current in the primary coil is 0, and the secondary coil transfers the energy to
In the load.
Optionally, in discontinuous conduct mode, the preset formula is as follows for the flyback converter work:
Wherein, IpvFor the current output electric current of the photovoltaic module, the Ts is the duty cycle of the primary side switch, institute
State dpriFor the current duty cycle, the LpriFor the inductance value of primary side, VpvFor the current output voltage.
Optionally, the controller, is used for:
It is greater than or equal to a upper output power in the present output power and the current output voltage is greater than or equal to
A upper output voltage；Alternatively, the present output power is less than a upper output power and the current output voltage is less than upper one
When output voltage, the current duty cycle is increased into the duty ratio after the first default value is adjusted；
By the duty ratio that the duty cycle adjustment of the input current of the power converter is after the adjusting.
Optionally, the controller, is used for:
It is greater than or equal to a upper output power in the present output power and the current output voltage is defeated less than upper one
Voltage out；Alternatively, the present output power is less than a upper output power and the current output voltage is greater than or equal to upper one
When output voltage, the current duty cycle is reduced into the duty ratio after the second default value is adjusted；
It controls the power converter and exports electric current to the load according to the duty ratio after the adjusting.
Second aspect provides a kind of maximum power point tracking method in photovoltaic system, is applied to first aspect and provides
Maximum power point tracking system in, which comprises
Obtain the current duty cycle and the collected current output voltage of voltage acquisition component of power converter input current；
The current duty cycle and the current output voltage are inputted into preset formula, obtain the current of the photovoltaic module
Export electric current；
The present output power of the photovoltaic module is calculated using the current output voltage and the current output electric current；
The present output power is compared with a upper output power and electric by the current output voltage and a upper output
Pressure is compared；
The duty ratio of the input current is adjusted, according to comparison result to track the maximum power point of the photovoltaic system.
Optionally, described that the current duty cycle and the current output voltage are inputted into preset formula, obtain the light
Before the current output electric current for lying prostrate module, further includes:
Obtain the work wave of the power converter；
The work wave is fitted, is obtained using current duty cycle and current output voltage as the default public affairs of variable
Formula.
Optionally, the power converter is flyback converter, and flyback converter work is in discontinuous current
Mode, the preset formula are as follows:
Wherein, IpvFor the current output electric current of the photovoltaic module, the Ts is the duty cycle of the primary side switch, institute
State dpriFor the current duty cycle, the LpriFor the inductance value of primary side, VpvFor the current output voltage.
Optionally, the duty ratio that the input current is adjusted according to comparison result, comprising:
It is greater than or equal to a upper output power in the present output power and the current output voltage is greater than or equal to
A upper output voltage；Alternatively, the present output power is less than a upper output power and the current output voltage is less than upper one
When output voltage, the current duty cycle is increased into the duty ratio after the first default value is adjusted；
It is greater than or equal to a upper output power in the present output power and the current output voltage is defeated less than upper one
Voltage out；Alternatively, the present output power is less than a upper output power and the current output voltage is greater than or equal to upper one
When output voltage, the current duty cycle is reduced into the duty ratio after the second default value is adjusted；
By the duty ratio that the duty cycle adjustment of the input current of the power converter is after the adjusting.
The beneficial effects of the present application are as follows: photovoltaic effect is based on by photovoltaic module and converts solar energy into electric energy；
Power converter realizes the energy transmission between photovoltaic module and load；The current output of voltage acquisition component acquisition photovoltaic module
Voltage；Controller obtains the current duty cycle and the collected current output electricity of voltage acquisition component of power converter input current
Pressure；Current duty cycle and current output voltage are inputted into preset formula, obtain the current output electric current of photovoltaic module；Using current
Output voltage and current output electric current calculate the present output power of photovoltaic module；By present output power and a upper output power
Compare and is compared current output voltage with a upper output voltage；The duty ratio of input current is adjusted according to comparison result,
To track the maximum power point of photovoltaic system；It can solve existing maximum power point tracking system to need that voltage sensor is arranged
The output electric current of photovoltaic module is acquired to acquire the output voltage of photovoltaic module, also need to be arranged current sensor, leads to this
The more complicated problem of the structure of system；Since controller can be estimated according to the output voltage of photovoltaic module and the duty ratio of electric current
The output electric current of photovoltaic module is calculated, it is therefore not necessary to additionally setting current sensor acquires the output electric current of photovoltaic module, it can
To simplify the structure of the maximum power point tracking system in photovoltaic system.
Above description is only the general introduction of technical scheme, in order to better understand the technological means of the application,
And can be implemented in accordance with the contents of the specification, with the preferred embodiment of the application and cooperate attached drawing below detailed description is as follows.
Detailed description of the invention
Fig. 1 is the structural representation of the maximum power point tracking system in the photovoltaic system that the application one embodiment provides
Figure；
Fig. 2 is the structural schematic diagram for the flyback converter that the application one embodiment provides；
Fig. 3 is the schematic diagram of the work wave for the flyback converter that the application one embodiment provides；
Fig. 4 is the flow chart of the maximum power point tracking method in the photovoltaic system that the application one embodiment provides.
Specific embodiment
With reference to the accompanying drawings and examples, the specific embodiment of the application is described in further detail.Implement below
Example is not limited to scope of the present application for illustrating the application.
Fig. 1 is the structural representation of the maximum power point tracking system in the photovoltaic system that the application one embodiment provides
Figure, as shown in Figure 1, the system includes at least: photovoltaic module 110, power converter 120, voltage acquisition component 130, controller
140 and load 150.
Photovoltaic module 110 is used to convert solar energy into electric energy based on photovoltaic effect.Optionally, photovoltaic module 110
It is made of multiple silicon solar cells.Photovoltaic module 110 is connected by power converter 120 with load 150.
Power converter 120 is for realizing the energy transmission between photovoltaic module and load.Power converter 120 is to load
150 output electric currents.
Optionally, power converter 120 is flyback converter.With reference to flyback converter shown in Fig. 2, the inverse-excitation type
Converter includes transformer；The primary side of transformer includes primary side switch 21 and the primary coil being connected with primary side switch 22, transformation
The secondary side of device includes and the secondary coil 23 of 22 mutual inductance of primary coil and the diode 24 being connected with secondary coil 23.
Work of the flyback converter at discontinuous conduct mode (Discontinuous current mode, DCM) is former
Reason includes: that the electric current when primary side switch 21 is closed, in primary coil 22 increases, and energy is stored in magnetic core；In primary side switch
When 21 disconnection, the electric current in primary coil 22 is 0, and secondary coil 23 transfers the energy in load 150.
Based on the working principle under above-mentioned DCM, with reference to the work wave of inverse-excitation type sensor shown in Fig. 3.Assuming that primary side
The working frequency of switch 21 is fsw, then each duty cycle Ts=1/fsw.If primary side switch 21 is closed at the moment 0, the electricity of primary side
Inducing current start from scratch it is linearly increasing, in moment dpriTs reaches current maxima；Primary side switch 21 is in moment dpriTs closure, it is former
Energy in the primary coil 22 on side is discharged by secondary coil 23 and diode 24, and the electric current of secondary coil 23 is from highest dotted line
Property is decreased to 0.Wherein, dpriFor the current duty cycle of electric current.
Voltage acquisition component 130 is set to 110 output end of photovoltaic module.Voltage acquisition component 130 is for acquiring photovoltaic mould
The current output voltage of block.Voltage acquisition component 130 can be used for the device of collection voltages for voltage sensor, voltmeter etc.,
The present embodiment does not limit the type of voltage acquisition component 130.
The controller 140 being connected respectively with voltage acquisition component 130 and power converter 120.Controller 140 is for obtaining
The current duty cycle and the collected current output voltage of voltage acquisition component of power converter input current；By current duty cycle
Preset formula is inputted with current output voltage, obtains the current output electric current of photovoltaic module；Using current output voltage and currently
Export the present output power that electric current calculates photovoltaic module；By present output power compared with a upper output power and will be current
Output voltage is compared with a upper output voltage；The duty ratio of input current is adjusted, according to comparison result to track photovoltaic system
The maximum power point of system.
Wherein, a upper output power is the output power obtained at a upper tracking moment, and a upper output voltage is a upper tracking
The output voltage that moment obtains.
Optionally, the current duty cycle that controller 140 is got under original state is pre-stored value；Later, it controls
The current duty cycle that device 140 is got is adjusted to obtain to a upper duty ratio.
In one example, preset formula is preset in controller 140.Alternatively, preset formula is controller 140 to power
What the work wave of converter 120 was fitted, at this point, controller 140 is also used to: by current duty cycle and current defeated
Voltage input preset formula out obtains the work wave of power converter before obtaining the current output electric current of photovoltaic module；It is right
Work wave is fitted, and is obtained using current duty cycle and current output voltage as the preset formula of variable.Assuming that power is converted
The work wave of device is as shown in figure 3, at this point, controller 140 is fitted to obtain I to the work waveL, priIt can be estimated by following formula
It calculates:
Wherein, IL, priFor present current value, VinFor the input voltage of primary side, LpriFor the inductance value of primary side.In photovoltaic system
In system, the input voltage V of primary sideinFor the output voltage V of photovoltaic module 110pv, the present current value of primary side is photovoltaic module
110 current output electric current, carries out above formula based on this to be converted to following preset formulas:
Wherein, IpvFor the current output electric current of photovoltaic module, Ts is the duty cycle of primary side switch, dpriFor current duty
Than LpriFor the inductance value of primary side, VpvFor current output voltage.
According to preset formula it is found that the current output electric current I of photovoltaic modulepvWith current output voltage VpvWith currently account for
Sky ratio dpriVariation and change.
Controller 140 is passed through using the present output power that current output voltage and current output electric current calculate photovoltaic module
Following formula indicates:
Wherein, PpvIt (t) is present output power.
Schematically, during duty ratio of the controller 140 according to comparison result adjusting input current, in current output work
Rate is greater than or equal to a upper output power and current output voltage is greater than or equal to a upper output voltage；Alternatively, current output work
Rate presets current duty cycle increase by first less than a upper output power and when current output voltage is less than a upper output voltage
Numerical value adjusted after duty ratio；By the duty ratio that the duty cycle adjustment of the input current of power converter 120 is after adjusting.
Wherein, the first default value is preset in controller 140, and the first default value is positive number, and the present embodiment is not to the
The value of one default value limits.
Alternatively, present output power is more than or equal to a upper output power and current output voltage is less than a upper output
Voltage；Alternatively, present output power is less than a upper output power and current output voltage is greater than or equal to a upper output voltage
When, current duty cycle is reduced into the duty ratio after the second default value is adjusted for the input current of power converter 120
Duty cycle adjustment is the duty ratio after adjusting.
Second default value can be equal with the first default value；Alternatively, can also be differed with the first default value, second
Default value is positive number, and the present embodiment does not limit the value of the second default value.
In conclusion the maximum power point tracking system in photovoltaic system provided in this embodiment, passes through photovoltaic module base
Electric energy is converted solar energy into photovoltaic effect；Power converter realizes the energy transmission between photovoltaic module and load；
The current output voltage of voltage acquisition component acquisition photovoltaic module；Controller obtains currently accounting for for the input current of power converter
Sky than with the collected current output voltage of voltage acquisition component；By current duty cycle and the default public affairs of current output voltage input
Formula obtains the current output electric current of photovoltaic module；Working as photovoltaic module is calculated using current output voltage and current output electric current
Preceding output power；By present output power compared with a upper output power and by current output voltage and a upper output voltage into
Row compares；The duty ratio of input current is adjusted, according to comparison result to track the maximum power point of photovoltaic system；It can solve existing
Some maximum power point tracking systems need to be arranged voltage sensor to acquire the output voltage of photovoltaic module, also need that electricity is arranged
Flow sensor acquires the output electric current of photovoltaic module, the problem for causing the structure of the system more complicated；Since controller can
To estimate the output electric current of photovoltaic module according to the output voltage of photovoltaic module and the duty ratio of electric current, it is therefore not necessary to additionally
Current sensor is set to acquire the output electric current of photovoltaic module, can simplify the maximum power point tracking system in photovoltaic system
Structure.
Fig. 4 is the flow chart of the maximum power point tracking method in the photovoltaic system that the application one embodiment provides, this
Embodiment is applied in this way in the maximum power point tracking system in photovoltaic system shown in FIG. 1, and each step is held
Row main body be the system in controller 140 for be illustrated.This method includes at least following steps:
Step 401, current duty cycle and the voltage acquisition component for obtaining power converter input current are collected current
Output voltage.
Optionally, controller can first obtain the current duty cycle of power converter input current, then obtain voltage acquisition
The collected current output voltage of component；Alternatively, the collected current output voltage of voltage acquisition component can also be first obtained, then
Obtain the current duty cycle of power converter input current；Alternatively, obtaining the current duty of power converter input current simultaneously
Than with the collected current output voltage of voltage acquisition component, the present embodiment is not between current duty cycle and current output voltage
Acquisition sequence limit.
Step 402, current duty cycle and current output voltage are inputted into preset formula, obtains the current output of photovoltaic module
Electric current.
Optionally, preset formula is default in the controller.Alternatively, controller obtains the work wave of power converter；It is right
Work wave is fitted, and is obtained using current duty cycle and current output voltage as the preset formula of variable.
In one example, power converter is flyback converter, and flyback converter work is in discontinuous current mould
Formula, preset formula are as follows:
Wherein, IpvFor the current output electric current of photovoltaic module, Ts is the duty cycle of primary side switch, dpriFor current duty
Than LpriFor the inductance value of primary side, VpvFor current output voltage.
Step 403, the present output power of photovoltaic module is calculated using current output voltage and current output electric current.
Under controller is passed through using the present output power that current output voltage and current output electric current calculate photovoltaic module
Formula indicates:
Wherein, PpvIt (t) is present output power.
Step 404, present output power is compared with a upper output power and electric by current output voltage and a upper output
Pressure is compared.
Optionally, present output power is subtracted a upper output power and obtains difference power by controller；By current output voltage
It subtracts an output voltage and obtains voltage difference.
Schematically, controller by present output power compared with a upper output power and by current output voltage with it is upper
The process that one output voltage is compared refers to following formula:
ΔPpv(t)=Ppv(t)-Ppv(t-1)
ΔVpv(t)=Vpv(t)-Vpv(t-1)
Wherein, Δ PpvIt (t) is difference power, Δ VpvIt (t) is voltage difference.
Step 405, the duty ratio of input current is adjusted, according to comparison result to track the maximum power point of photovoltaic system.
It is greater than or equal to a upper output power in present output power and current output voltage is greater than or equal to a upper output
Voltage；Alternatively, present output power will be worked as less than a upper output power and when current output voltage is less than a upper output voltage
Preceding duty ratio increases the duty ratio after the first default value is adjusted；It is greater than or equal to a upper output work in present output power
Rate and current output voltage are less than a upper output voltage；Alternatively, present output power is less than a upper output power and current defeated
When voltage is greater than or equal to a upper output voltage out, current duty cycle is reduced into the duty after the second default value is adjusted
Than；By the duty ratio that the duty cycle adjustment of the input current of power converter is after the adjusting.
Schematically, the first default value is equal with the second default value, is Δ d.
Schematically, controller is referred to according to the process of the duty ratio of the input current of comparison result regulation power converter
Following formula:
In Δ PpvAnd Δ V (t) >=0pv(t) >=0 when, dpri(t)=dpri(t-1)+Δd；
In Δ PpvAnd Δ V (t) >=0pv(t) when < 0, dpri(t)=dpri(t-1)-Δd；
In Δ Ppv(t) < 0 and Δ Vpv(t) >=0 when, dpri(t)=dpri(t-1)-Δd；
In Δ Ppv(t) < 0 and Δ Vpv(t) when < 0, dpri(t)=dpri(t-1)+Δd。
In conclusion the maximum power point tracking method in photovoltaic system provided in this embodiment, is turned by obtaining power
The current duty cycle and the collected current output voltage of voltage acquisition component of the input current of parallel operation；By current duty cycle and work as
Preceding output voltage inputs preset formula, obtains the current output electric current of photovoltaic module；Use current output voltage and current output
The present output power of electric current calculating photovoltaic module；Present output power will be exported compared with a upper output power and currently
Voltage is compared with a upper output voltage；The duty ratio of input current is adjusted, according to comparison result to track photovoltaic system
Maximum power point；It can solve existing maximum power point tracking system and need to be arranged voltage sensor to acquire photovoltaic module
Output voltage needs to be arranged current sensor also to acquire the output electric current of photovoltaic module, causes the structure of the system more multiple
Miscellaneous problem；Since controller can estimate the defeated of photovoltaic module according to the output voltage of photovoltaic module and the duty ratio of electric current
Electric current out can simplify in photovoltaic system it is therefore not necessary to current sensor be arranged additionally to acquire the output electric current of photovoltaic module
Maximum power point tracking system structure.
Optionally, the application is also provided with a kind of computer readable storage medium, in the computer readable storage medium
It is stored with program, described program is loaded by processor and executed the maximum work in the photovoltaic system to realize above method embodiment
Rate point tracking method.
Optionally, the application is also provided with a kind of computer product, which includes computer-readable storage medium
Matter is stored with program in the computer readable storage medium, and described program is loaded by processor and executed to realize above-mentioned side
Maximum power point tracking method in the photovoltaic system of method embodiment.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The several embodiments of the application above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the concept of this application, various modifications and improvements can be made, these belong to the protection of the application
Range.Therefore, the scope of protection shall be subject to the appended claims for the application patent.
Claims (10)
1. the maximum power point tracking system in a kind of photovoltaic system, which is characterized in that the maximum power point tracking system packet
It includes:
Photovoltaic module, for converting solar energy into electric energy based on photovoltaic effect, the photovoltaic module is converted by power
Device is connected with load；
The power converter, for realizing the energy transmission between the photovoltaic module and the load；
It is set to the voltage acquisition component of the photovoltaic module output end, the voltage acquisition component is for acquiring the photovoltaic mould
The current output voltage of block；
The controller being connected respectively with the voltage acquisition component and the power converter, the controller are described for obtaining
The current duty cycle of power converter input current and the collected current output voltage of voltage acquisition component；Work as by described in
Preceding duty ratio and the current output voltage input preset formula, obtain the current output electric current of the photovoltaic module；Using institute
It states current output voltage and the current output electric current calculates the present output power of the photovoltaic module；By the current output
Power is compared compared with a upper output power and by the current output voltage with a upper output voltage；It is tied according to comparing
Fruit adjusts the duty ratio of the input current, to track the maximum power point of the photovoltaic system.
2. maximum power point tracking system according to claim 1, which is characterized in that the controller is also used to:
The current duty cycle and the current output voltage are inputted into preset formula described, obtain working as the photovoltaic module
Before preceding output electric current, the work wave of the power converter is obtained；
The work wave is fitted, is obtained using current duty cycle and current output voltage as the preset formula of variable.
3. maximum power point tracking system according to claim 2, which is characterized in that the power converter is inverse-excitation type
Converter, the flyback converter include transformer；The primary side of the transformer includes primary side switch and opens with the primary side
Close connected primary coil, the secondary side of the transformer include with the secondary coil of the primary coil mutual inductance and with described time
The connected diode of grade coil；
In primary side switch closure, the electric current in the primary coil increases, and energy is stored in magnetic core；
When the primary side switch disconnects, the electric current in the primary coil is 0, and the secondary coil transfers the energy to described
In load.
4. maximum power point tracking system according to claim 3, which is characterized in that the flyback converter work exists
Discontinuous conduct mode, the preset formula are as follows:
Wherein, IpvFor the current output electric current of the photovoltaic module, the Ts is the duty cycle of the primary side switch, described
dpriFor the current duty cycle, the LpriFor the inductance value of primary side, VpvFor the current output voltage.
5. maximum power point tracking system according to claim 1, which is characterized in that the controller is used for:
It is greater than or equal to a upper output power in the present output power and the current output voltage is greater than or equal to upper one
Output voltage；Alternatively, the present output power is less than a upper output power and the current output voltage is less than a upper output
When voltage, the current duty cycle is increased into the duty ratio after the first default value is adjusted；
By the duty ratio that the duty cycle adjustment of the input current of the power converter is after the adjusting.
6. maximum power point tracking system according to claim 1, which is characterized in that the controller is used for:
It is greater than or equal to a upper output power in the present output power and the current output voltage is less than upper output electricity
Pressure；Alternatively, the present output power is less than a upper output power and the current output voltage is greater than or equal to a upper output
When voltage, the current duty cycle is reduced into the duty ratio after the second default value is adjusted；
By the duty ratio that the duty cycle adjustment of the input current of the power converter is after the adjusting.
7. a kind of maximum power point tracking method in photovoltaic system, which is characterized in that be applied to any institute of claim 1 to 6
In the maximum power point tracking system stated, which comprises
Obtain the current duty cycle and the collected current output voltage of voltage acquisition component of power converter input current；
The current duty cycle and the current output voltage are inputted into preset formula, obtain the current output of the photovoltaic module
Electric current；
The present output power of the photovoltaic module is calculated using the current output voltage and the current output electric current；
By the present output power compared with a upper output power and by the current output voltage and a upper output voltage into
Row compares；
The duty ratio of the input current is adjusted, according to comparison result to track the maximum power point of the photovoltaic system.
8. the method according to the description of claim 7 is characterized in that described by the current duty cycle and current output electricity
Pressure input preset formula, before obtaining the current output electric current of the photovoltaic module, further includes:
Obtain the work wave of the power converter；
The work wave is fitted, is obtained using current duty cycle and current output voltage as the preset formula of variable.
9. and described according to the method described in claim 8, it is characterized in that, the power converter is flyback converter
Flyback converter works in discontinuous conduct mode, and the preset formula is as follows:
Wherein, IpvFor the current output electric current of the photovoltaic module, the Ts is the duty cycle of the primary side switch, described
dpriFor the current duty cycle, the LpriFor the inductance value of primary side, VpvFor the current output voltage.
10. the method according to the description of claim 7 is characterized in that described adjust the input current according to comparison result
Duty ratio, comprising:
It is greater than or equal to a upper output power in the present output power and the current output voltage is greater than or equal to upper one
Output voltage；Alternatively, the present output power is less than a upper output power and the current output voltage is less than a upper output
When voltage, the current duty cycle is increased into the duty ratio after the first default value is adjusted；
It is greater than or equal to a upper output power in the present output power and the current output voltage is less than upper output electricity
Pressure；Alternatively, the present output power is less than a upper output power and the current output voltage is greater than or equal to a upper output
When voltage, the current duty cycle is reduced into the duty ratio after the second default value is adjusted；
By the duty ratio that the duty cycle adjustment of the input current of the power converter is after the adjusting.
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| CN116736929A (en) * | 2023-06-26 | 2023-09-12 | 浙江大学 | Photovoltaic string global maximum power point tracking method and system based on region segmentation |
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