CN113359937A - Method for quickly tracking power of photovoltaic cell panel - Google Patents

Method for quickly tracking power of photovoltaic cell panel Download PDF

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Publication number
CN113359937A
CN113359937A CN202110656947.8A CN202110656947A CN113359937A CN 113359937 A CN113359937 A CN 113359937A CN 202110656947 A CN202110656947 A CN 202110656947A CN 113359937 A CN113359937 A CN 113359937A
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China
Prior art keywords
power
tracking
now
value
voltage
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CN202110656947.8A
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Chinese (zh)
Inventor
井延伟
莫红影
郭雪松
沙济通
魏晓阳
张勇
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Hebei Jiantou New Energy Co ltd
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Hebei Jiantou New Energy Co ltd
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Priority to CN202110656947.8A priority Critical patent/CN113359937A/en
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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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

Abstract

The invention provides a method for quickly tracking power of a photovoltaic cell panel, which comprises the steps of obtaining a power instruction required by a load, shielding an original tracking loop, calculating a voltage set value required to be adjusted for tracking, setting the original tracking voltage set value as a recalculated voltage set value, and putting the recalculated voltage set value into the tracking loop again after a bus is stable. The method for quickly tracking the power of the photovoltaic cell panel improves the active power regulation speed of the photovoltaic inverter, so that the input is quickly tracked to a required power value.

Description

Method for quickly tracking power of photovoltaic cell panel
Technical Field
The invention belongs to the technical field of photovoltaic panel power tracking, and particularly relates to a method for quickly tracking power of a photovoltaic cell panel and an emergency charging power supply.
Background
With the expansion of the photovoltaic market, the traditional photovoltaic power generation system mainly tracks at the maximum power point to seek the maximum output power. However, in an actual system, a certain load is often desired to be controlled according to the required power output, and in order to meet the fast response of load change, the photovoltaic power generation system is required to be capable of fast and stable response and fast power regulation.
The traditional photovoltaic cell panel tracking mainly tracks the right side of a maximum power point, and in order to ensure the stable tracking of a system, a voltage average value of a certain time needs to be calculated to slowly adjust a voltage value, so that the maximum power point tracking is obtained, the tracking time is long, and the power adjustment time is long.
Disclosure of Invention
In view of this, the present invention aims to provide a method for fast tracking power of a photovoltaic cell panel and an emergency charging power supply, so as to solve the problems that the tracking of the conventional photovoltaic cell panel is mainly performed on the right side of the maximum power point, the tracking time is long, and the power regulation time is long.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
in a first aspect, the invention provides a method for fast power tracking of a photovoltaic cell panel, which includes the steps of obtaining a power instruction required by a load, shielding an original tracking loop, calculating a voltage given value required to be adjusted for tracking, setting the voltage given value required to be tracked as a recalculated voltage given value, and putting the recalculated voltage given value into the tracking loop again after a bus is stabilized.
Furthermore, the power required by the load is set externally or acquired by a data acquisition unit.
Further, the recalculated voltage given value is smaller than the maximum power point voltage value determined by primary grid connection and larger than the input side voltage low-voltage protection voltage value.
Further, when power adjustment is carried out, power adjustment is carried out by combining the P-U relation on the left side of the maximum power point in the P-U curve of the photovoltaic cell panel;
the formula for calculating the given voltage value required to be adjusted in tracking is as follows:
Uref＝Unow-(Pnow-Plimit)/Inow
or
Uref＝Unow+(Plimit-Pnow)/Inow
Wherein, UrefFor a given voltage value recalculated according to the required power command, UnowRepresenting the present voltage value, PnowRepresenting the current power value, PlimitIndicating the received power command value, InowIndicating the current value.
Furthermore, when multiple photovoltaic cell panels are used for tracking, the voltage given value of each tracking path needs to be calculated.
In a second aspect, the present invention provides a method for tracking specified power of a photovoltaic cell panel, where when a power adjustment command is received, the method for tracking specified power is implemented by using the method for tracking fast power of a photovoltaic cell panel according to the first aspect.
In a third aspect, the present invention provides an electronic device, including a processor, and a memory communicatively connected to the processor and configured to store instructions executable by the processor, where the processor executes the instructions to implement the method for fast power tracking of a photovoltaic panel according to the first aspect.
Compared with the prior art, the method for quickly tracking the power of the photovoltaic cell panel and the emergency charging power supply have the following advantages:
the method for quickly tracking the power of the photovoltaic cell panel improves the active power regulation speed of the photovoltaic inverter, and enables the input to be quickly tracked to a required power value.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a flow chart of a method for fast power tracking of a photovoltaic panel;
fig. 2 is a voltage-current characteristic curve and a power characteristic curve of a photovoltaic cell panel under a certain illumination temperature condition;
FIG. 3 is a schematic diagram of the rapid power regulation of a photovoltaic panel;
fig. 4 is a voltage setting calculation flow chart of the photovoltaic panel for fast tracking on the left side of the maximum power point;
fig. 5 is a flow chart of a method of photovoltaic panel specified power tracking.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
The first embodiment is as follows:
the embodiment provides a method for tracking power of a photovoltaic cell panel quickly (as shown in fig. 1), which includes the steps of obtaining a power instruction required by a load, shielding an original tracking loop, calculating and tracking a voltage given value required to be adjusted, setting the voltage given value of the original tracking as a recalculated voltage given value, and putting the voltage given value into the tracking loop again after a bus is stabilized.
In an embodiment, the power required by the load is set externally or acquired by a data acquisition unit, and the acquisition of the power required by the load includes at least the following two modes:
firstly, manual setting is carried out by utilizing manpower, and the set power required by the load is manually input by combining with an operation interface to form a control instruction of the method;
secondly, the intelligent acquisition is carried out by utilizing a data acquisition unit, the data acquisition unit can be a current sensor and/or a voltage sensor, and a power acquisition unit acquires the required power and forms a control instruction of the method.
In an embodiment, the recalculated voltage given value is smaller than the maximum power point voltage value determined by the primary grid connection and larger than the input side voltage low-voltage protection voltage value.
In the embodiment, when power adjustment is carried out, power adjustment is carried out by combining a P-U relation on the left side of a maximum power point in a P-U curve of a photovoltaic cell panel;
the formula for calculating the given voltage value required to be adjusted in tracking is as follows:
Uref＝Unow-(Pnow-Plimit)/Inow
or
Uref＝Unow+(Plimit-Pnow)/Inow
Wherein, UrefFor a given voltage value recalculated according to the required power command, UnowRepresenting the present voltage value, PnowRepresenting the current power value, PlimitIndicating the received power command value, InowIndicating the current value.
When multiple photovoltaic cell panels are used for tracking, the voltage given value of each tracking path needs to be calculated.
The specific method comprises the following steps:
and judging whether the active power needs to be adjusted quickly, if so, shielding the original tracking program, and if not, continuing to track. If the fast tracking is needed, calculating the current power according to the collected voltage and current values, and calculating the current power according to a formula Uref＝Unow-(Pnow-Plimit)/InowAnd calculating a voltage value to be regulated, and giving the voltage value to the boost control loop, and putting the tracking loop into operation again until the bus loop operates stably, wherein the regulated voltage value is required to be greater than a direct current undervoltage protection threshold value, smaller than the bus voltage value and smaller than a maximum power point value of primary grid-connected operation.
According to the characteristic that the photovoltaic cell panel shown in the figure 2 meets the U-I characteristic curve and the P-U characteristic curve, the current on the left side of the maximum power point is approximately equal by combining the characteristic of the U-I characteristic curve of the photovoltaic cell panel, and the power on the left side of the maximum power point and the voltage are changed in a linear relation by combining the characteristic of the P-U characteristic curve of the photovoltaic cell panel. Therefore, the photovoltaic cell panel is controlled to track on the left side of the maximum power point and linearly change, and the change of power can be adjusted according to the change of voltage.
From the schematic diagram of fig. 3, it can be seen that the current voltage is set to UnowCurrent is InowCalculating the power Pnow＝Unow*InowNeed to be regulated to voltage Uref，Uref＝Plimit/Iref(ii) a As can be seen by combining the U-I characteristic curve of the photovoltaic cell panel, I is approximately equal to Iref, so that Uref-Unow＝(Plimit-Pnow)/Inow。
Because the original tracking loop is acquired once in a long time, the small voltage value is increased and decreased in a single step each time, the change of the power value is not very large, and the maximum power point can be tracked in a long time. And the original tracking loop is shielded on the left side of the maximum power point, and the fast adjustment is carried out according to the calculated voltage given value, so that the single-step operation can be carried out to the vicinity of the required power point.
The adjustment formula for calculating the voltage is as follows: u shaperef＝Unow-(Pnow-Plimit)/InowOr Uref＝Unow+(Plimit-Pnow)/Inow. According to the formula, no matter the power changes from small to large or from large to small, the single-step tracking adjustment can be realized by adjusting to the required power point in a single step.
Fig. 4 is a flow chart of voltage setting calculation for fast tracking of the photovoltaic panel on the left side of the maximum power point, which is implemented according to the detected current voltage UnowAnd the present current InowThe magnitude P of the current power can be rapidly calculatednowAnd then P as requiredlimitLine power regulation according to formula Uref＝Unow-(Pnow-Plimit)/InowThe voltage value U to be regulated at the left side of the maximum power point can be quickly calculatedref。
When high power is adjusted to low power, Pnow>PlimitAccording to the received power limit value PlimitCalculating Δ U ═ Pnow-Plimit)/Inow，ΔU>0，Uref＝Unow-ΔU，UrefAnd reducing the voltage set value, and rapidly adjusting to low voltage in one step. U shaperefNeeds to be greater than the minimum value tracked.
When low power is adjusted to high power, Pnow<Plimit，ΔU＝(Pnow-Plimit)/Inow，ΔU<0，Uref＝Unow-ΔU，UrefAnd increasing the voltage set value, and rapidly adjusting to high voltage in a single step. U shaperefThe value of the bus voltage is required to be smaller than the maximum power point value of the primary grid-connected operation.
Wherein, UrefFor a given voltage value, U, calculated on the basis of the active commandnowRepresenting the present voltage value, PnowRepresenting the current power value, PlimitIndicating the received power command value, InowIndicating the current value.
Example two:
the embodiment provides a method for tracking specified power of a photovoltaic cell panel, and when a power regulation instruction is received, the method for tracking the specified power is realized by using the method for tracking the rapid power of the photovoltaic cell panel in any embodiment.
The specific method comprises the following steps:
under the condition that the photovoltaic cell panel is normally tracked, if a regulation instruction according to a certain specified power is received, then: and shielding an original tracking program, calculating a voltage value to be regulated, and giving the voltage value to the boost control loop, and putting the tracking loop into operation again after the bus ring operates stably, wherein the regulated voltage value needs to be greater than a direct current undervoltage protection threshold value.
Under the condition that the photovoltaic cell panel is normally tracked, if a regulation instruction according to a certain specified power is received, then: and shielding an original tracking program, calculating a voltage value to be regulated, and giving the voltage value to the boost control loop, and putting the tracking loop into operation again until the bus loop stably operates, wherein the regulated voltage value is required to be smaller than the bus voltage value and smaller than the maximum power point value of primary grid-connected operation.
Example three:
the present embodiment provides an electronic device, including a processor and a memory communicatively connected to the processor and used for storing instructions executable by the processor, where the processor executes the instructions to implement the method for fast power tracking of a photovoltaic cell panel according to the first aspect, it should be noted that related hardware of the electronic device according to the present embodiment can all utilize the prior art. The method for fast power tracking of a photovoltaic panel according to any of the above embodiments is performed during operation by using an electronic device formed by assembling/connecting prior art/self-developed components, and such an electronic device is within the scope of the present application.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (7)

1. A method for fast power tracking of a photovoltaic cell panel is characterized by comprising the following steps: and acquiring a power instruction required by a load, shielding the original tracking loop, calculating a voltage given value required to be adjusted for tracking, setting the original tracked voltage given value as a recalculated voltage given value, and putting the recalculated voltage given value into the tracking loop again after the bus is stable.
2. The method of photovoltaic panel fast power tracking according to claim 1, characterized by: the power required by the load is set externally or acquired by a data acquisition unit.
3. The method of photovoltaic panel fast power tracking according to claim 1, characterized by: and the recalculated voltage given value is smaller than the maximum power point voltage value determined by primary grid connection and larger than the input side voltage low-voltage protection voltage value.
4. The method of photovoltaic panel fast power tracking according to claim 1, characterized by: when power adjustment is carried out, power adjustment is carried out by combining the P-U relation on the left side of the maximum power point in the P-U curve of the photovoltaic cell panel;
the formula for calculating the given voltage value required to be adjusted in tracking is as follows:
Uref＝Unow-(Pnow-Plimit)/Inow
or
Uref＝Unow+(Plimit-Pnow)/Inow
Wherein, UrefFor a given voltage value recalculated according to the required power command, UnowRepresenting the present voltage value, PnowRepresenting the current power value, PlimitIndicating the received power command value, InowIndicating the current value.
5. The method of photovoltaic panel fast power tracking according to claim 1, characterized by: when multiple photovoltaic cell panels are used for tracking, the voltage given value of each tracking path needs to be calculated.
6. A method for tracking specified power of a photovoltaic cell panel is characterized by comprising the following steps: when receiving a power regulation instruction, implementing a method for specified power tracking by using the method for rapid power tracking of the photovoltaic cell panel as claimed in any one of claims 1 to 5.
7. An electronic device comprising a processor and a memory communicatively coupled to the processor and configured to store processor-executable instructions, wherein: the processor, when executing the instructions, implements the method of photovoltaic panel fast power tracking of any of claims 1-5.
CN202110656947.8A 2021-06-11 2021-06-11 Method for quickly tracking power of photovoltaic cell panel Pending CN113359937A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103412609A (en) * 2013-08-21 2013-11-27 西安龙腾新能源科技发展有限公司 Output power control method of photovoltaic grid-connected inverter
CN104536509A (en) * 2014-11-21 2015-04-22 南车株洲电力机车研究所有限公司 Photovoltaic module electricity output control method
CN106774607A (en) * 2016-12-02 2017-05-31 东北电力大学 A kind of photovoltaic maximum power tracking of on-line amending open-circuit voltage
CN107196341A (en) * 2017-07-10 2017-09-22 华北电力大学（保定） The two-stage type of Variable power point tracking is without energy storage photovoltaic virtual synchronous machine control method
CN112134312A (en) * 2020-09-28 2020-12-25 阳光电源股份有限公司 Photovoltaic inverter quick response control method and control device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103412609A (en) * 2013-08-21 2013-11-27 西安龙腾新能源科技发展有限公司 Output power control method of photovoltaic grid-connected inverter
CN104536509A (en) * 2014-11-21 2015-04-22 南车株洲电力机车研究所有限公司 Photovoltaic module electricity output control method
CN106774607A (en) * 2016-12-02 2017-05-31 东北电力大学 A kind of photovoltaic maximum power tracking of on-line amending open-circuit voltage
CN107196341A (en) * 2017-07-10 2017-09-22 华北电力大学（保定） The two-stage type of Variable power point tracking is without energy storage photovoltaic virtual synchronous machine control method
CN112134312A (en) * 2020-09-28 2020-12-25 阳光电源股份有限公司 Photovoltaic inverter quick response control method and control device

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Application publication date: 20210907

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