CN111061332A - MPPT method, device and equipment of photovoltaic water pump and readable storage medium - Google Patents

MPPT method, device and equipment of photovoltaic water pump and readable storage medium Download PDF

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CN111061332A
CN111061332A CN201911421773.6A CN201911421773A CN111061332A CN 111061332 A CN111061332 A CN 111061332A CN 201911421773 A CN201911421773 A CN 201911421773A CN 111061332 A CN111061332 A CN 111061332A
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terminal voltage
water pump
step length
photovoltaic water
output power
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CN111061332B (en
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韩振松
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Shenzhen Invt Electric Co Ltd
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Shenzhen Invt Electric Co Ltd
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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity
    • F04B49/065—Control using electricity and making use of computers
    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • 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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  • Electromagnetism (AREA)
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Abstract

The application discloses a photovoltaic water pump MPPT method, a device, equipment and a computer readable storage medium, wherein the method comprises the following steps: taking the difference value of the voltage reference value of the first end of the battery panel and the terminal voltage reference value as the input quantity of the regulator, and acquiring the output quantity of the regulator, the voltage of the second end and second output power; obtaining an adjusting step length by using the terminal voltage and the output power, judging whether the absolute value of the adjusting step length is less than or equal to an adjusting threshold value, if so, determining a maximum power point, and controlling the solar cell panel to keep constant-voltage output; if not, updating the terminal voltage reference value by using the adjustment step length, and returning to the adjustment step until the maximum power point is determined. According to the technical scheme, self-adaptive adjustment is carried out on the adjustment step length according to the running condition of the photovoltaic water pump, so that the maximum power point can be quickly and accurately determined, constant-voltage output is kept, and the running stability of the photovoltaic water pump inverter is improved.

Description

MPPT method, device and equipment of photovoltaic water pump and readable storage medium
Technical Field
The application relates to the technical field of photovoltaic water pumps, in particular to a photovoltaic water pump MPPT method, device, equipment and a computer readable storage medium.
Background
The photovoltaic water pump is a system which directly converts solar energy into electric energy by using a solar cell panel so as to drive a water pump motor to operate by using a photovoltaic water pump inverter. When the solar panel is used for supplying Power, the terminal voltage of the solar panel is close to the Maximum Power Point (MPP) voltage (U)MPP) When the output frequency of the photovoltaic water pump inverter slightly changes, the terminal voltage of the solar cell panel can be rapidly reduced, correspondingly, the output frequency of the photovoltaic water pump inverter can be rapidly reduced, and finally the water yield is obviously reduced. Therefore, the Maximum Power Point needs to be determined by a Maximum Power Point Tracking (MPPT) method, so that the photovoltaic water pump inverter can operate at the Maximum Power Point of the solar panel, thereby increasing the water yield of the photovoltaic water pump.
At present, the maximum power point is usually determined by a fixed step length, but when the adopted step length is smaller, the determination speed of the maximum power point is slower and is easy to fall into local optimization, when the adopted step length is larger, the output frequency fluctuation of the photovoltaic water pump inverter is larger, the current waveform is not good, namely, the stability problem exists, and the service life of the photovoltaic water pump inverter and the water pump motor is shortened.
In summary, how to quickly and accurately determine the maximum power point and improve the operation stability of the photovoltaic water pump inverter is a technical problem to be solved urgently by those skilled in the art at present.
Disclosure of Invention
In view of this, an object of the present application is to provide a method, an apparatus, a device, and a computer readable storage medium for MPPT of a photovoltaic water pump, which are used to quickly and accurately determine a maximum power point and improve the operation stability of a photovoltaic water pump inverter.
In order to achieve the above purpose, the present application provides the following technical solutions:
a photovoltaic water pump MPPT point determining method comprises the following steps:
after the photovoltaic water pump inverter is normally started, detecting the voltage of a first end of the solar cell panel and first output power;
taking the difference value of the first terminal voltage and the terminal voltage reference value as the input quantity of a regulator, and obtaining the output quantity of the regulator, the second terminal voltage of the solar panel and the second output power after a first preset time length; wherein the output quantity is the current output frequency of the photovoltaic water pump inverter;
obtaining an adjustment step length by using the first terminal voltage, the second terminal voltage, the first output power and the second output power, judging whether the absolute value of the adjustment step length is smaller than or equal to an adjustment threshold value, if so, determining the second terminal voltage as the maximum power point voltage, and controlling the solar cell panel to keep constant voltage output;
if not, updating the terminal voltage reference value by using the adjusting step length, taking the second terminal voltage as the first terminal voltage, taking the second output power as the first output power, and returning to the step of taking the difference value between the first terminal voltage and the terminal voltage reference value as the input quantity of the adjuster until the absolute value of the adjusting step length is less than or equal to the adjusting threshold value.
Preferably, after obtaining the adjustment step size by using the first terminal voltage, the second terminal voltage, the first output power, and the second output power, the method further includes:
and judging whether the adjusting step length is smaller than a set lower limit step length or larger than a set upper limit step length, if the adjusting step length is smaller than the lower limit step length, taking the lower limit step length as the adjusting step length, and if the adjusting step length is larger than the upper limit step length, taking the upper limit step length as the adjusting step length.
Preferably, the method further comprises the following steps:
judging whether the current terminal voltage of the solar panel is reduced to a power failure frequency reduction critical point or not due to the change of environmental factors;
if so, reducing the output power of the photovoltaic water pump inverter so as to enable the current terminal voltage of the solar panel to be increased to be higher than the power-down frequency-reduction critical point.
Preferably, the method further comprises the following steps:
judging whether the voltage can meet the output voltage corresponding to the current output frequency of the photovoltaic water pump inverter when the solar panel outputs the voltage at the maximum modulation ratio;
and if not, determining the voltage of the solar panel as the maximum power point voltage.
Preferably, obtaining an adjustment step size by using the first terminal voltage, the second terminal voltage, the first output power, and the second output power includes:
according to
Figure BDA0002352571030000031
Obtaining delta U;
wherein, P2Is the second output power, P1For the first output power, U2Is the second terminal voltage, U1And lambda is the step length adjusting factor, and delta U is the adjusting step length.
Preferably, updating the terminal voltage reference value by using the adjustment step size includes:
according to Uref＝Uref+ Δ U updates the terminal voltage reference value;
wherein, UrefThe initial value of the terminal voltage reference value is Uref0。
Preferably, after determining the second terminal voltage as the maximum power point voltage, the method further includes:
giving a preset disturbance quantity delta U every second preset time length0And according to Uref＝Uref+ΔU0And updating the terminal voltage reference value, and returning to execute the step of taking the second terminal voltage as the first terminal voltage and taking the second output power as the first output power.
A photovoltaic water pump MPPT device includes:
the detection module is used for detecting the voltage of the first end and the first output power of the solar cell panel after the photovoltaic water pump inverter is normally started;
the acquisition module is used for taking the difference value of the first terminal voltage and the terminal voltage reference value as the input quantity of the regulator, and acquiring the output quantity of the regulator, the second terminal voltage of the solar panel and the second output power after a preset time length; wherein the output quantity is the current output frequency of the photovoltaic water pump inverter;
the first judgment module is used for obtaining an adjustment step length by utilizing the first terminal voltage, the second terminal voltage, the first output power and the second output power, judging whether the absolute value of the adjustment step length is smaller than or equal to an adjustment threshold value, if so, determining the second terminal voltage as the maximum power point voltage, and controlling the solar cell panel to keep constant voltage output;
and the updating module is used for updating the terminal voltage reference value by using the adjusting step length when the absolute value of the adjusting step length is less than or equal to the adjusting threshold, taking the second terminal voltage as the first terminal voltage, taking the second output power as the first output power, and returning to the step of taking the difference value between the first terminal voltage and the terminal voltage reference value as the input quantity of the adjuster until the absolute value of the adjusting step length is less than or equal to the adjusting threshold.
A photovoltaic water pump MPPT apparatus, comprising:
a memory for storing a computer program;
a processor for implementing the steps of the photovoltaic water pump MPPT method as described in any one of the above when executing the computer program.
A computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of a photovoltaic water pump MPPT method as set forth in any one of the above.
The application provides a photovoltaic water pump MPPT method, a device, equipment and a computer readable storage medium, wherein the method comprises the following steps: after the photovoltaic water pump inverter is normally started, detecting the voltage of a first end of the solar cell panel and first output power; taking the difference value of the first terminal voltage and the terminal voltage reference value as the input quantity of the regulator, and acquiring the output quantity of the regulator, the second terminal voltage of the solar panel and the second output power after a first preset time length; the output quantity is the current output frequency of the photovoltaic water pump inverter; obtaining an adjusting step length by utilizing the first end voltage, the second end voltage, the first output power and the second output power, judging whether the absolute value of the adjusting step length is smaller than or equal to an adjusting threshold value, if so, determining the second end voltage as the maximum power point voltage, and controlling the solar cell panel to keep constant voltage output; if not, updating the terminal voltage reference value by using the adjustment step length, taking the second terminal voltage as the first terminal voltage, taking the second output power as the first output power, and returning to the step of taking the difference value between the first terminal voltage and the terminal voltage reference value as the input quantity of the adjuster until the absolute value of the adjustment step length is less than or equal to the adjustment threshold value.
According to the technical scheme disclosed by the application, the reference value of the first end voltage and the end voltage of the solar cell panel is used as the input quantity of the regulator to regulate the output frequency of the photovoltaic water pump inverter, the end voltage and the output power of the solar cell panel are regulated through the change of the output frequency of the photovoltaic water pump inverter, the second end voltage and the second output power of the solar cell panel are correspondingly obtained after a first preset time length, then, the first end voltage, the second end voltage, the first output power and the second output power are used for obtaining the regulating step length, namely, the regulating step length is subjected to self-adaptive regulation according to the running conditions of the photovoltaic water pump inverter and the solar cell panel, the maximum power point is not determined by using the fixed step length any more, so that the maximum power point can be rapidly and accurately determined, after the maximum power point is determined according to the relation between the absolute value of the regulating step length and the regulating threshold, and determining the second end voltage at the moment as the maximum power point voltage, and controlling the solar cell panel to keep constant voltage output, so that the photovoltaic water pump inverter can operate at the output frequency corresponding to the maximum power point, the fluctuation of the output frequency of the photovoltaic water pump inverter is reduced, the operation stability of the photovoltaic water pump inverter is improved, and the service lives of the photovoltaic water pump and the water pump motor are prolonged.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a flowchart of an MPPT method of a photovoltaic water pump according to an embodiment of the present disclosure;
fig. 2 is a flowchart of another MPPT method for a photovoltaic water pump according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of an MPPT device of a photovoltaic water pump provided in an embodiment of the present application;
fig. 4 is a schematic structural diagram of a photovoltaic water pump MPPT apparatus provided in an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application.
Referring to fig. 1, which shows a flowchart of a photovoltaic water pump MPPT method provided in an embodiment of the present application, the photovoltaic water pump MPPT method provided in an embodiment of the present application may include:
s11: after the photovoltaic water pump inverter is normally started, the voltage of the first end of the solar cell panel and the first output power are detected.
After the photovoltaic water pump inverter is powered on by the solar panel, the terminal voltage of the solar panel at the moment is collected and recorded (the terminal voltage at the moment is the open-circuit voltage V of the solar panel)oc) Judging whether the terminal voltage of the solar cell panel at the moment is greater than the undervoltage of the photovoltaic water pump inverter software, if not, indicating that the photovoltaic water pump inverter is possible to have undervoltage fault, and at the moment, the photovoltaic water pump inverter enters a standby stateAnd if so, indicating that the terminal voltage of the solar cell panel at the moment accords with the operation condition and the photovoltaic water pump inverter can be normally started. After the photovoltaic water pump inverter obtains a starting command, detecting the first end voltage of the solar panel and the first output power of the solar panel, wherein the detected first end voltage of the solar panel is the open-circuit voltage V of the solar panelocThe first output power is 0.
S12: and taking the difference value of the first terminal voltage and the terminal voltage reference value as the input quantity of the regulator, and acquiring the output quantity of the regulator, the second terminal voltage of the solar panel and the second output power after a first preset time length.
And the output quantity is the current output frequency of the photovoltaic water pump inverter.
The difference value of the first terminal voltage and the terminal voltage reference value of the solar cell panel (specifically, the difference value obtained by subtracting the terminal voltage reference value from the first terminal voltage) detected after the photovoltaic water pump inverter is normally started is used as the input quantity of the regulator, acquiring the output quantity of the regulator after a first preset time length, wherein the output quantity of the regulator is the current output frequency of the photovoltaic water pump inverter at the moment, namely, the output frequency of the photovoltaic water pump inverter can be regulated by taking the difference value of the voltage at the first end of the solar panel and the terminal voltage as the input quantity of the regulator, the change of the output frequency of the photovoltaic water pump inverter can affect the terminal voltage and the output power of the solar panel, so that the terminal voltage and the output power of the solar panel are changed, therefore, and the output quantity of the regulator can be obtained, and simultaneously the second terminal voltage and the second output power of the solar panel at the moment can be obtained.
The regulation parameter of the regulator is set in advance through experimental simulation, theoretical calculation or experience so as to obtain the corresponding output quantity better according to the difference value of the first terminal voltage and the terminal voltage reference value, the first preset time length is the change period of the terminal voltage reference value, namely, the terminal voltage reference value changes once every preset time length in the process of determining the maximum power point, and the specific time length is that the terminal voltage reference value changes once every preset time lengthThe size may be set in advance based on experience or the like. In addition, the initial value of the terminal voltage reference value is Uref0The first end voltage of the solar cell panel detected after the photovoltaic water pump inverter is normally started can be set in advance, wherein the initial value U isref0Is less than the voltage of the first end of the solar cell panel detected after the inverter of the photovoltaic water pump is normally started, namely Uref0Less than the open circuit voltage V of the solar panelocCan be compared with the open-circuit voltage V of the solar panelocAnd 10V less (of course, the value can be adjusted according to actual conditions, and the application is not limited in any way).
In addition, the regulator used in the application may be specifically a PID regulator, that is, the difference value between the reference value of the first terminal voltage and the reference value of the terminal voltage may be used as the input quantity of the PID regulator, and the variation quantity of the output frequency of the photovoltaic water pump inverter may be used as the output quantity of the PID regulator, where the PID regulator may make the dynamic process fast, stable and accurate, and has a relatively good regulation effect, and before using the PID regulator, K may be set reasonably through experimental simulation, theoretical calculation or according to experience in advancep(coefficient of proportionality), Ki(integral coefficient), Kd(differential coefficient) and then, the set coefficient is involved in the adjustment.
S13: and obtaining the adjustment step length by utilizing the first end voltage, the second end voltage, the first output power and the second output power.
After the first end voltage, the second end voltage, the first output power and the second output power of the solar cell panel are obtained, the first end voltage, the second end voltage, the first output power and the second output power can be utilized to obtain an adjusting step length, and the adjusting step length is adjusted in a self-adaptive mode according to the operation conditions of the photovoltaic water pump inverter and the solar cell panel. Compared with the MPPT method adopting the fixed step length in the prior art, the MPPT method adopting the fixed step length can be used for rapidly and accurately determining the maximum power point by utilizing the mode that the terminal voltage and the output power of the solar cell panel before and after the regulation by the regulator are self-adaptively regulated on the regulation step length, and can avoid the situation of getting into the local optimum condition, so that the solar cell panel can exert the characteristic of maximum energy utilization.
S14: judging whether the absolute value of the adjusting step length is less than or equal to an adjusting threshold value; if so, go to step S15, otherwise, go to step S16.
After the adjustment step size is obtained, whether the absolute value of the adjustment step size is smaller than or equal to an adjustment threshold value is judged. The adjustment threshold is a relatively small value set in advance based on experience or experimental simulation.
If the absolute value of the adjusting step length is smaller than or equal to the adjusting threshold, the photovoltaic water pump is considered to determine the maximum power point, and at the moment, the adjuster does not perform adjusting action any more; if the absolute value of the adjusting step length is not smaller than or equal to the adjusting threshold, the photovoltaic water pump is considered not to determine the maximum power point, at this time, the adjuster can continue to perform the adjusting action, that is, the adjusting threshold can be used as the threshold of the adjuster action, and whether the adjuster executes the adjusting action can be determined through the adjusting threshold.
S15: and determining the voltage of the second end as the voltage of the maximum power point, and controlling the solar panel to keep constant voltage output.
If the absolute value of the adjusting step length is less than or equal to the adjusting threshold value, namely when the maximum power point is determined, the second end voltage corresponding to the solar cell panel at the moment can be determined as the maximum power point voltage, at the moment, the solar cell panel can be controlled to keep constant voltage output (constant voltage means that the end voltage reference value does not change any more, at the moment, the determined maximum power point voltage (namely the second end voltage) corresponding to the end voltage reference value does not fluctuate greatly any more, namely the solar cell panel can operate at the maximum power point voltage) so as to exert the maximum energy utilization rate of the solar cell panel, and meanwhile, the photovoltaic water pump inverter can operate at the output frequency corresponding to the maximum power point (namely the photovoltaic water pump inverter can operate at the maximum output frequency as much as possible), so that the water yield of the photovoltaic water pump is improved, and the fluctuation of the output frequency of the photovoltaic, and the problem of poor current waveform is avoided as much as possible, so that the running stability of the photovoltaic water pump inverter is improved, and the service lives of the photovoltaic water pump inverter and the water pump motor are prolonged.
S16: updating the terminal voltage reference value by using the adjustment step length;
s17: the second terminal voltage is set as the first terminal voltage, and the second output power is set as the first output power, and then the process returns to step S12.
If the absolute value of the adjustment step length is not less than or equal to the adjustment threshold, that is, when the maximum power point is not determined, the terminal voltage reference value may be updated by using the adjustment step length to obtain a new terminal voltage reference value, and at the same time, the second terminal voltage may be used as a new first terminal voltage, and the second output power may be used as a new first output power, and then, the step S12 is returned to continue to search for the maximum power point until the absolute value of the adjustment step length is less than or equal to the adjustment threshold, that is, until the maximum power point is determined, so that the solar panel may operate at the maximum power point, and the photovoltaic water pump inverter may operate at the output frequency corresponding to the maximum power point.
According to the technical scheme disclosed by the application, the reference value of the first end voltage and the end voltage of the solar cell panel is used as the input quantity of the regulator to regulate the output frequency of the photovoltaic water pump inverter, the end voltage and the output power of the solar cell panel are regulated through the change of the output frequency of the photovoltaic water pump inverter, the second end voltage and the second output power of the solar cell panel are correspondingly obtained after a first preset time length, then, the first end voltage, the second end voltage, the first output power and the second output power are used for obtaining the regulating step length, namely, the regulating step length is subjected to self-adaptive regulation according to the running conditions of the photovoltaic water pump inverter and the solar cell panel, the maximum power point is not determined by using the fixed step length any more, so that the maximum power point can be rapidly and accurately determined, after the maximum power point is determined according to the relation between the absolute value of the regulating step length and the regulating threshold, and determining the second end voltage at the moment as the maximum power point voltage, and controlling the solar cell panel to keep constant voltage output, so that the photovoltaic water pump inverter can operate at the output frequency corresponding to the maximum power point, the fluctuation of the output frequency of the photovoltaic water pump inverter is reduced, the operation stability of the photovoltaic water pump inverter is improved, and the service lives of the photovoltaic water pump and the water pump motor are prolonged.
The MPPT method for the photovoltaic water pump provided in the embodiment of the present application further includes, after obtaining the adjustment step length by using the first terminal voltage, the second terminal voltage, the first output power, and the second output power:
and judging whether the adjusting step length is smaller than the set lower limit step length or larger than the set upper limit step length, if the adjusting step length is smaller than the lower limit step length, taking the lower limit step length as the adjusting step length, and if the adjusting step length is larger than the upper limit step length, taking the upper limit step length as the adjusting step length.
After obtaining the adjustment step length by using the first terminal voltage, the second terminal voltage, the first output power and the second output power, it can be determined whether the adjustment step length is smaller than the set lower limit step length Δ UminOr whether the upper limit step length delta U is larger than the set upper limit step length delta UmaxIf the adjusting step length is less than the set lower limit step length delta UminTaking the lower limit step length as an adjusting step length to participate in the MPPT method, and if the adjusting step length is larger than the set upper limit step length delta UmaxThen the upper limit step size Δ U is setmaxAs the adjustment step length, if the adjustment step length is in the set lower limit step length delta UminAnd an upper limit step size Δ UmaxAnd then, the calculated adjusting step length is used for participating in the MPPT method, namely the adjusting step length can be limited to have a lower limit step length delta UminAnd an upper limit step size Δ UmaxIn the formed interval, the uncontrollable condition caused by overlarge calculated adjusting step length is avoided as much as possible, and the condition that the maximum power point is missed is avoided as much as possible, so that the maximum power point is determined reliably and efficiently.
The photovoltaic water pump MPPT method provided by the embodiment of the application can further comprise the following steps:
judging whether the current terminal voltage of the solar panel is reduced to a power failure frequency reduction critical point or not due to the change of environmental factors;
if so, reducing the output power of the photovoltaic water pump inverter so as to enable the current terminal voltage of the solar panel to be increased to be higher than a power failure frequency reduction critical point.
Considering that the operation of the solar panel is influenced by environmental factors such as illumination or temperature, in order to improve the anti-interference capability of the solar panel to the change of the environmental factors, and to avoid the instant power failure of the photovoltaic water pump inverter as much as possible, thereby improving the operation reliability of the photovoltaic water pump, any step from S11 to S17 is executed, and at the same time, whether the current terminal voltage of the solar panel (referring to the current terminal voltage of the solar panel, which may correspond to the first terminal voltage or the second terminal voltage in different steps S11 to S17) falls to the power down critical point due to the change of the environmental factors is judged, if so, in order to prevent the voltage of the photovoltaic water pump inverter from being pulled down by a load due to too low voltage, the power down frequency down function can be started, that is, the output power of the photovoltaic water pump inverter is reduced, so that the current terminal voltage of the solar panel rises to the power down frequency critical point, therefore, the photovoltaic water pump inverter can avoid the condition of under-voltage fault shutdown caused by sudden change of environmental factors, and after the current terminal voltage of the solar panel is increased to be higher than a power failure down-conversion critical point, the steps parallel to the photovoltaic water pump inverter are continuously executed, for example: if the current terminal voltage of the solar panel is reduced to the power-down frequency reduction critical point due to the change of the environmental factors in the process of executing the step S12, continuing executing the step S12 after the current terminal voltage of the solar panel is increased to the power-down frequency reduction critical point; if not, directly continuing to execute the steps parallel to the maximum power point so as to continuously determine the maximum power point.
The photovoltaic water pump MPPT method provided by the embodiment of the application can further comprise the following steps:
judging whether the voltage can meet the output voltage corresponding to the current output frequency of the photovoltaic water pump inverter or not when the voltage is output by the solar panel at the maximum modulation ratio;
and if not, determining the voltage of the solar panel as the maximum power point voltage.
In order to prevent the photovoltaic water pump from entering weak magnetism due to insufficient current terminal voltage of the solar panel while executing steps S11 to S17, any one of steps S11 to S17 may be executed while determining whether the voltage can satisfy an output voltage corresponding to the current output frequency of the photovoltaic water pump inverter when the solar panel outputs the voltage at the maximum modulation ratio, if so, the step parallel to the voltage may be directly continued, and if not, the voltage at the moment of the solar panel is determined to be the maximum power point voltage, and the solar panel is allowed to output constantly at the voltage, thereby preventing the photovoltaic water pump from entering weak magnetism.
The MPPT method for the photovoltaic water pump provided in the embodiment of the present application obtains the adjustment step length by using the first terminal voltage, the second terminal voltage, the first output power, and the second output power (i.e., the above S13), and includes:
according to
Figure BDA0002352571030000101
Obtaining delta U;
wherein, P2Is the second output power, P1Is a first output power, U2Is the second terminal voltage, U1And the voltage of the first end is lambda, the step length adjusting factor is lambda, and the delta U is an adjusting step length.
The step length can be adjusted by using the first terminal voltage, the second terminal voltage, the first output power and the second output power
Figure BDA0002352571030000102
Calculating an adjustment step size Δ U, where P2Is the second output power, P1Is a first output power, U2Is the second terminal voltage, U1For the first terminal voltage, λ is a step adjustment factor (which is a fixed value set in advance).
The MPPT method for the photovoltaic water pump provided in the embodiment of the present application, which updates the terminal voltage reference value by using the adjustment step length (i.e. the above S16), includes:
according to Uref＝Uref+ delta U updates the terminal voltage reference value;
wherein, UrefIs terminal voltage reference value with initial value of Uref0。
After the adjustment step size Δ U is obtained by calculation, if the absolute value of the adjustment step size Δ U is not less than or equal to the adjustment threshold, the absolute value may be determined according to Uref＝Uref+ delta U updates the terminal voltage reference value, where UrefFor terminal voltage reference values, in particular, U following the equationrefU preceding the equation for the terminal voltage reference value to be updatedrefIs an updated terminal voltage reference value with an initial value of Uref0。
Referring to fig. 2, a flowchart of another MPPT method for a photovoltaic water pump provided in an embodiment of the present application is shown. After determining the second terminal voltage as the maximum power point voltage (i.e., the above-mentioned S15), the MPPT method for the photovoltaic water pump further includes:
s18: giving a preset disturbance quantity delta U every second preset time length0And according to Uref＝Uref+ΔU0And updating the terminal voltage reference value, and returning to execute the steps of taking the second terminal voltage as the first terminal voltage and taking the second output power as the first output power.
After the absolute value of the adjustment step is less than or equal to the adjustment threshold and the second terminal voltage is determined as the maximum power point voltage, a fixed preset disturbance amount DeltaU can be given every second preset time length0And according to Uref＝Uref+ΔU0Updating the terminal voltage reference value, then returning to execute the step of taking the second terminal voltage as the first terminal voltage and the second output power as the first output power, namely returning to execute the step S17, and after executing the step S17, returning to execute the step S12 so as to update the terminal voltage reference value through a given preset disturbance quantity when the maximum power point of the solar panel changes along with the influence of environmental factors such as illumination, temperature and the like or other factors to determine the changed maximum power point, so that the solar panel and the photovoltaic water pump inverter can work at the maximum power point position as far as possible, and therefore the solar panel and the photovoltaic water pump inverter can work at the maximum power point position as far as possible, and the method can be used for controlling the solar panel and the photovoltaic water pumpThe water yield of the photovoltaic water pump is improved.
The photovoltaic water pump MPPT device that this application embodiment provided, see fig. 3, it shows a photovoltaic water pump MPPT device's that this application embodiment provides structural schematic diagram, can include:
the detection module 31 is used for detecting the first end voltage and the first output power of the solar cell panel after the photovoltaic water pump inverter is normally started;
the obtaining module 32 is configured to use a difference value between the first terminal voltage and the terminal voltage reference value as an input quantity of the regulator, and obtain an output quantity of the regulator, a second terminal voltage of the solar panel, and a second output power after a preset time period elapses; the output quantity is the current output frequency of the photovoltaic water pump inverter;
the first judging module 33 is configured to obtain an adjustment step length by using the first terminal voltage, the second terminal voltage, the first output power, and the second output power, judge whether an absolute value of the adjustment step length is smaller than or equal to an adjustment threshold, determine the second terminal voltage as a maximum power point voltage if the absolute value of the adjustment step length is smaller than or equal to the adjustment threshold, and control the solar cell panel to maintain constant-voltage output;
and the updating module 34 is configured to update the terminal voltage reference value by using the adjustment step length when the absolute value of the adjustment step length is less than or equal to the adjustment threshold, use the second terminal voltage as the first terminal voltage, use the second output power as the first output power, and return to the step of using the difference between the first terminal voltage and the terminal voltage reference value as the input quantity of the regulator until the absolute value of the adjustment step length is less than or equal to the adjustment threshold.
The photovoltaic water pump MPPT device that this application embodiment provided can also include:
and the second judgment module is used for judging whether the adjustment step length is smaller than the set lower limit step length or larger than the set upper limit step length after the adjustment step length is obtained by utilizing the first end voltage, the second end voltage, the first output power and the second output power, taking the lower limit step length as the adjustment step length if the adjustment step length is smaller than the lower limit step length, and taking the upper limit step length as the adjustment step length if the adjustment step length is larger than the upper limit step length.
The photovoltaic water pump MPPT device that this application embodiment provided can also include:
the third judgment module is used for judging whether the current terminal voltage of the solar panel is reduced to a power-down frequency-reduction critical point due to the change of environmental factors;
and the output power reducing module is used for reducing the output power of the photovoltaic water pump inverter if the current terminal voltage of the solar panel is reduced to the power-down frequency-reduction critical point due to the change of environmental factors so as to increase the current terminal voltage of the solar panel to be higher than the power-down frequency-reduction critical point.
The photovoltaic water pump MPPT device that this application embodiment provided can also include:
the fourth judgment module is used for judging whether the voltage can meet the output voltage corresponding to the current output frequency of the photovoltaic water pump inverter when the voltage is output by the solar panel at the maximum modulation ratio;
and the determining module is used for determining the voltage of the solar panel as the maximum power point voltage if the voltage does not meet the output voltage corresponding to the current output frequency of the photovoltaic water pump inverter.
The utility model provides a photovoltaic water pump MPPT device, first judgement module 33 can include:
a unit for calculating an adjustment step size based on
Figure BDA0002352571030000121
Obtaining delta U;
wherein, P2Is the second output power, P1Is a first output power, U2Is the second terminal voltage, U1And the voltage of the first end is lambda, the step length adjusting factor is lambda, and the delta U is an adjusting step length.
The photovoltaic water pump MPPT device that this application embodiment provided, update module 34 can include:
an update unit for updating according to Uref＝Uref+ delta U updates the terminal voltage reference value;
wherein, UrefAs terminal voltage reference value, terminal voltage reference valueIs initially Uref0。
The photovoltaic water pump MPPT device that this application embodiment provided can also include:
a return execution module for giving a preset disturbance quantity delta U every second preset time length after the second end voltage is determined as the maximum power point voltage0And according to Uref＝Uref+ΔU0And updating the terminal voltage reference value, and returning to execute the steps of taking the second terminal voltage as the first terminal voltage and taking the second output power as the first output power.
The embodiment of the present application further provides a photovoltaic water pump MPPT device, refer to fig. 4, which shows a schematic structural diagram of a photovoltaic water pump MPPT device provided by the embodiment of the present application, and may include:
a memory 41 for storing a computer program;
the processor 42, when executing the computer program stored in the memory 41, may implement the following steps:
after the photovoltaic water pump inverter is normally started, detecting the voltage of a first end of the solar cell panel and first output power; taking the difference value of the first terminal voltage and the terminal voltage reference value as the input quantity of the regulator, and acquiring the output quantity of the regulator, the second terminal voltage of the solar panel and the second output power after a first preset time length; the output quantity is the current output frequency of the photovoltaic water pump inverter; obtaining an adjusting step length by utilizing the first end voltage, the second end voltage, the first output power and the second output power, judging whether the absolute value of the adjusting step length is smaller than or equal to an adjusting threshold value, if so, determining the second end voltage as the maximum power point voltage, and controlling the solar cell panel to keep constant voltage output; if not, updating the terminal voltage reference value by using the adjustment step length, taking the second terminal voltage as the first terminal voltage, taking the second output power as the first output power, and returning to the step of taking the difference value between the first terminal voltage and the terminal voltage reference value as the input quantity of the adjuster until the absolute value of the adjustment step length is less than or equal to the adjustment threshold value.
The computer-readable storage medium provided in the embodiments of the present application stores a computer program thereon, and when executed by a processor, the computer program can implement the following steps:
after the photovoltaic water pump inverter is normally started, detecting the voltage of a first end of the solar cell panel and first output power; taking the difference value of the first terminal voltage and the terminal voltage reference value as the input quantity of the regulator, and acquiring the output quantity of the regulator, the second terminal voltage of the solar panel and the second output power after a first preset time length; the output quantity is the current output frequency of the photovoltaic water pump inverter; obtaining an adjusting step length by utilizing the first end voltage, the second end voltage, the first output power and the second output power, judging whether the absolute value of the adjusting step length is smaller than or equal to an adjusting threshold value, if so, determining the second end voltage as the maximum power point voltage, and controlling the solar cell panel to keep constant voltage output; if not, updating the terminal voltage reference value by using the adjustment step length, taking the second terminal voltage as the first terminal voltage, taking the second output power as the first output power, and returning to the step of taking the difference value between the first terminal voltage and the terminal voltage reference value as the input quantity of the adjuster until the absolute value of the adjustment step length is less than or equal to the adjustment threshold value.
For a description of relevant parts in the photovoltaic water pump MPPT device, the apparatus, and the computer-readable storage medium provided in the embodiment of the present application, reference may be made to detailed descriptions of corresponding parts in the photovoltaic water pump MPPT method provided in the embodiment of the present application, and details are not described herein again.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Furthermore, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include elements inherent in the list. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element. In addition, parts of the above technical solutions provided in the embodiments of the present application, which are consistent with the implementation principles of corresponding technical solutions in the prior art, are not described in detail so as to avoid redundant description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A photovoltaic water pump MPPT method is characterized by comprising the following steps:
after the photovoltaic water pump inverter is normally started, detecting the voltage of a first end of the solar cell panel and first output power;
taking the difference value of the first terminal voltage and the terminal voltage reference value as the input quantity of a regulator, and obtaining the output quantity of the regulator, the second terminal voltage of the solar panel and the second output power after a first preset time length; wherein the output quantity is the current output frequency of the photovoltaic water pump inverter;
obtaining an adjustment step length by using the first terminal voltage, the second terminal voltage, the first output power and the second output power, judging whether the absolute value of the adjustment step length is smaller than or equal to an adjustment threshold value, if so, determining the second terminal voltage as the maximum power point voltage, and controlling the solar cell panel to keep constant voltage output;
if not, updating the terminal voltage reference value by using the adjusting step length, taking the second terminal voltage as the first terminal voltage, taking the second output power as the first output power, and returning to the step of taking the difference value between the first terminal voltage and the terminal voltage reference value as the input quantity of the adjuster until the absolute value of the adjusting step length is less than or equal to the adjusting threshold value.
2. The MPPT method of a photovoltaic water pump of claim 1, further comprising, after obtaining an adjustment step size using the first terminal voltage, the second terminal voltage, the first output power, and the second output power:
and judging whether the adjusting step length is smaller than a set lower limit step length or larger than a set upper limit step length, if the adjusting step length is smaller than the lower limit step length, taking the lower limit step length as the adjusting step length, and if the adjusting step length is larger than the upper limit step length, taking the upper limit step length as the adjusting step length.
3. The photovoltaic water pump MPPT method of claim 1, further comprising:
judging whether the current terminal voltage of the solar panel is reduced to a power failure frequency reduction critical point or not due to the change of environmental factors;
if so, reducing the output power of the photovoltaic water pump inverter so as to enable the current terminal voltage of the solar panel to be increased to be higher than the power-down frequency-reduction critical point.
4. The photovoltaic water pump MPPT method of claim 1, further comprising:
judging whether the voltage can meet the output voltage corresponding to the current output frequency of the photovoltaic water pump inverter when the solar panel outputs the voltage at the maximum modulation ratio;
and if not, determining the voltage of the solar panel as the maximum power point voltage.
5. The MPPT method for a photovoltaic water pump as claimed in any one of claims 1 to 4, wherein obtaining an adjustment step size using the first terminal voltage, the second terminal voltage, the first output power and the second output power includes:
according to
Figure FDA0002352571020000021
Obtaining delta U;
wherein, P2Is the second output power, P1For the first output power, U2Is the second terminal voltage, U1And lambda is the step length adjusting factor, and delta U is the adjusting step length.
6. The MPPT method of a photovoltaic water pump as described in claim 5, wherein updating said terminal voltage reference value with said adjustment step size comprises:
according to Uref＝Uref+ Δ U updates the terminal voltage reference value;
wherein, UrefThe initial value of the terminal voltage reference value is Uref0。
7. The photovoltaic water pump MPPT method of claim 6, further comprising, after determining the second terminal voltage as a maximum power point voltage:
giving a preset disturbance quantity delta U every second preset time length0And according to Uref＝Uref+ΔU0And updating the terminal voltage reference value, and returning to execute the step of taking the second terminal voltage as the first terminal voltage and taking the second output power as the first output power.
8. The utility model provides a photovoltaic water pump MPPT device which characterized in that includes:
the detection module is used for detecting the voltage of the first end and the first output power of the solar cell panel after the photovoltaic water pump inverter is normally started;
the acquisition module is used for taking the difference value of the first terminal voltage and the terminal voltage reference value as the input quantity of the regulator, and acquiring the output quantity of the regulator, the second terminal voltage of the solar panel and the second output power after a preset time length; wherein the output quantity is the current output frequency of the photovoltaic water pump inverter;
the first judgment module is used for obtaining an adjustment step length by utilizing the first terminal voltage, the second terminal voltage, the first output power and the second output power, judging whether the absolute value of the adjustment step length is smaller than or equal to an adjustment threshold value, if so, determining the second terminal voltage as the maximum power point voltage, and controlling the solar cell panel to keep constant voltage output;
and the updating module is used for updating the terminal voltage reference value by using the adjusting step length when the absolute value of the adjusting step length is less than or equal to the adjusting threshold, taking the second terminal voltage as the first terminal voltage, taking the second output power as the first output power, and returning to the step of taking the difference value between the first terminal voltage and the terminal voltage reference value as the input quantity of the adjuster until the absolute value of the adjusting step length is less than or equal to the adjusting threshold.
9. The utility model provides a photovoltaic water pump MPPT equipment which characterized in that includes:
a memory for storing a computer program;
a processor for implementing the steps of the photovoltaic water pump MPPT method of any one of claims 1 to 7 when executing the computer program.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a computer program which, when being executed by a processor, carries out the steps of the photovoltaic water pump MPPT method according to any one of claims 1 to 7.
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