CN112507560A - Segmented photovoltaic array equivalent polymerization model modeling method and system - Google Patents

Segmented photovoltaic array equivalent polymerization model modeling method and system Download PDF

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CN112507560A
CN112507560A CN202011477605.1A CN202011477605A CN112507560A CN 112507560 A CN112507560 A CN 112507560A CN 202011477605 A CN202011477605 A CN 202011477605A CN 112507560 A CN112507560 A CN 112507560A
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photovoltaic
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CN112507560B (en
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姜世公
吴志力
王云飞
李红军
韩俊
蔡超
王建华
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State Grid Corp of China SGCC
Southeast University
State Grid Economic and Technological Research Institute
Economic and Technological Research Institute of State Grid Jiangsu Electric Power Co Ltd
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State Grid Corp of China SGCC
Southeast University
State Grid Economic and Technological Research Institute
Economic and Technological Research Institute of State Grid Jiangsu Electric Power Co Ltd
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Abstract

The invention relates to a modeling method and a system for a segmented photovoltaic array equivalent polymerization model, which comprises the following steps: s1: establishing a photovoltaic cell engineering mathematical model under a normal illumination condition according to the technical parameters of the photovoltaic array; s2: monitoring the illumination condition of the photovoltaic array in real time, and determining the illumination intensity variation of each photovoltaic cell in the photovoltaic array; s3: correcting a photovoltaic cell engineering mathematical model of the photovoltaic array according to the illumination intensity variation; s4: sequencing the illumination intensity variation of the photovoltaic cells in each photovoltaic group string, and establishing a photovoltaic cell equivalent model of each photovoltaic group string; s5: and polymerizing the photovoltaic cell equivalent models of the photovoltaic group strings to finally generate an equivalent polymerization model of the whole photovoltaic array so as to determine the specific working state of each photovoltaic cell in the photovoltaic array. When photovoltaic parameter correction is considered, only the illumination intensity variation is required to be concerned, and the method is suitable for photovoltaic systems in different scale magnitudes.

Description

Segmented photovoltaic array equivalent polymerization model modeling method and system
Technical Field
The invention relates to a segmented photovoltaic array equivalent polymerization model modeling method and system, and belongs to the technical field of photovoltaic energy.
Background
The photovoltaic has outstanding advantages of energy renewability, environmental friendliness and the like, is regarded as one of main clean energy sources for replacing fossil fuels in the future, and is currently researched and applied in a large quantity. The photovoltaic grid connection is a complex system integrating a photovoltaic array and a related power electronic grid connection converter, wherein the photovoltaic array is formed by combining a plurality of photovoltaic cells in series and parallel, and has a complex structure, so that direct analysis is inconvenient, and related equivalent modeling research needs to be carried out on a photovoltaic model.
However, at present, research aiming at photovoltaic modeling is often performed by taking a photovoltaic power generation system as a whole, and more focuses on a typical grid-connected scene of a large photovoltaic power station. The integrated analysis helps to further simplify the equivalent model, but the problem of misalignment of the equivalent model under complex system working conditions can also exist, such as the condition of illumination blocked by local shadow. In addition, with the continuous evolution of power distribution technology, a direct current power distribution network is gradually becoming a hot spot of current research, and occasions where the photovoltaic is connected to the power grid in a distributed manner are gradually increased, which also puts higher requirements on the accuracy of a photovoltaic model. Obviously, the existing integral modeling method using a photovoltaic power generation system as a basic unit cannot meet the requirement of photovoltaic access to a direct-current power distribution network on one hand, and on the other hand, the high-precision equivalent output characteristic is difficult to obtain.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a method and a system for modeling a segmented photovoltaic array equivalent polymerization model, wherein when photovoltaic parameter correction is considered, only a single variable, i.e., a variation of illumination intensity, needs to be paid attention to, thereby bringing convenience to actual monitoring work, implementing specific working states of each photovoltaic cell in a photovoltaic array, and being suitable for modeling photovoltaic power generation systems of different scale levels.
In order to achieve the purpose, the invention adopts the following technical scheme: a modeling method of a segmented photovoltaic array equivalent polymerization model comprises the following steps: s1: establishing a photovoltaic cell engineering mathematical model under a normal illumination condition according to the technical parameters of the photovoltaic array; s2: monitoring the illumination condition of the photovoltaic array in real time, and determining the illumination intensity variation of each photovoltaic cell in the photovoltaic array; s3: correcting a photovoltaic cell engineering mathematical model of the photovoltaic array according to the illumination intensity variation; s4: sequencing the illumination intensity variation of the photovoltaic cells in each photovoltaic group string, and establishing a photovoltaic cell equivalent model of each photovoltaic group string; s5: and polymerizing the photovoltaic cell equivalent models of the photovoltaic group strings to finally generate an equivalent polymerization model of the whole photovoltaic array so as to determine the specific working state of each photovoltaic cell in the photovoltaic array.
Further, the technical parameters of the photovoltaic array in step S1 include: short-circuit current I of photovoltaic cellsc_refOpen circuit voltage Uoc_refMaximum power point current Im_refMaximum workRate point voltage Um_refAnd maximum power point power Pm_ref。
Further, the mathematical model of photovoltaic cell engineering under normal lighting conditions in step S1 is:
Figure BDA0002836105510000021
in the formula Icell_refAnd Ucell_refRespectively output current and output voltage of the photovoltaic cell under the normal illumination condition; c1And C2Are intermediate variables in the calculation process.
Further, the process of correcting the photovoltaic cell engineering mathematical model of the photovoltaic array in step S3 includes the following steps: correcting the short-circuit current of the photovoltaic cell according to the change condition of the illumination condition; and correcting the open-circuit voltage of the photovoltaic cell according to the change condition of the illumination condition, and establishing a corrected engineering mathematical model of the photovoltaic cell according to the corrected short-circuit current and the corrected open-circuit voltage.
Further, the corrected engineering mathematical model of the photovoltaic cell is as follows:
Figure BDA0002836105510000022
in the formula IijAnd UijRespectively is the actual output current and the actual output voltage of the ith photovoltaic cell in the jth group of photovoltaic group strings in the light needle array under any illumination condition, FI(ΔGij) As correction factor for short-circuit current, FU(ΔGij) Δ G as a correction factor for the open-circuit voltageijAnd indicating the illumination intensity change value of the ith photovoltaic cell in the jth group of photovoltaic group strings in the light pointer array.
Further, the correction equation of the short-circuit current of the photovoltaic cell is as follows:
Figure BDA0002836105510000023
in the formula IscijIs short-circuit current G of ith photovoltaic cell in jth photovoltaic string in the optical probe array under any illumination conditionrefLight intensity under normal conditions, GijΔ G is the intensity of light actually received by the photovoltaic cellijIs the corresponding illumination intensity variation; a is a calculation coefficient, K is an illumination intensity influence coefficient, Delta T is the working temperature variation of the photovoltaic cell, and Delta Tij＝KGrefΔGij，FI(ΔGij) Correction coefficient for short circuit current;
the correction equation for the open circuit voltage of a photovoltaic cell is:
Uocij＝Uoc_ref(1-cΔTij)(1+bΔGij)
＝Uoc_ref[-bcKGrefΔ2Gij+(b-cKGref)ΔGij+1]
＝FU(ΔGij)Uoc_ref
wherein, UocijThe open-circuit voltage of the ith photovoltaic cell in the jth group of photovoltaic group string in the light needle array under any illumination condition, b and c are calculation coefficients, FU(ΔGij) Is a correction factor for the open circuit voltage.
Further, the process of establishing the photovoltaic cell equivalent model of each photovoltaic string in step 4 is as follows: s4.1 pairs of N in jth group photovoltaic group stringsThe magnitude of the illumination intensity variation of the individual photovoltaic cells is sorted, and N in the jth photovoltaic group string is determinedsActual short circuit current values for individual photovoltaic cells; s4.2, according to the actual short-circuit current value, carrying out on the size of each photovoltaic cell, and establishing an equivalent output model of the jth group of photovoltaic strings; and S4.3, completing the equivalent output models of all the photovoltaic group strings according to the equivalent output model of the jth photovoltaic group string.
Further, the formula of the equivalent output model of the jth group photovoltaic group string in step S4.2 is:
Figure BDA0002836105510000031
in the formula Istring_jAnd Ustring_jThe actual equivalent output current and the actual equivalent output voltage of the jth photovoltaic string under any illumination condition are respectively.
Further, the formula of the equivalent aggregation model of the entire photovoltaic array in step S5 is:
Figure BDA0002836105510000032
wherein, IoutAnd UoutThe actual output current and the actual output voltage of the photovoltaic array under any illumination condition, NpThe number of the photovoltaic string is shown.
The invention also discloses a segmented photovoltaic array equivalent polymerization model modeling system, which comprises: the normal illumination modeling module is used for establishing a photovoltaic cell engineering mathematical model under the normal illumination condition according to the technical parameters of the photovoltaic array; the illumination monitoring module is used for monitoring the illumination condition of the photovoltaic array in real time and determining the illumination intensity variation of each photovoltaic cell in the photovoltaic array; the model correction module is used for correcting a photovoltaic cell engineering mathematical model of the photovoltaic array according to the illumination intensity variation; the string equivalent modeling module is used for sequencing the illumination intensity variation of the photovoltaic cells in each photovoltaic string and establishing a photovoltaic cell equivalent model of each photovoltaic string; and the array equivalent modeling module is used for aggregating the photovoltaic cell equivalent models of the photovoltaic group strings to finally generate an equivalent aggregation model of the whole photovoltaic array so as to determine the specific working state of each photovoltaic cell in the photovoltaic array.
Due to the adoption of the technical scheme, the invention has the following advantages: aiming at a typical photovoltaic array structure, when photovoltaic parameter correction is considered, only a single variable of the illumination intensity variation is needed to be paid attention to, certain convenience is brought to actual monitoring work, the specific working state of each photovoltaic cell in the photovoltaic array is realized, and the photovoltaic power generation system modeling method is suitable for modeling of photovoltaic power generation systems under different scale levels. The established equivalent polymerization model greatly shortens the calculation time and saves the calculation cost on the basis of ensuring the accuracy of the output external characteristics, has generality and can be effectively applied to various complex working conditions.
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FIG. 1 is a flow chart of a method for modeling a segmented photovoltaic array equivalent aggregation model in an embodiment of the invention;
FIG. 2 is a block diagram of an exemplary photovoltaic array in accordance with an embodiment of the present invention;
fig. 3 is an equivalent circuit diagram of a photovoltaic cell in a photovoltaic array in accordance with an embodiment of the present invention.
Detailed Description
The present invention is described in detail by way of specific embodiments in order to better understand the technical direction of the present invention for those skilled in the art. It should be understood, however, that the detailed description is provided for a better understanding of the invention only and that they should not be taken as limiting the invention. In describing the present invention, it is to be understood that the terminology used is for the purpose of description only and is not intended to be indicative or implied of relative importance.
Example one
The embodiment discloses a modeling method of a segmented photovoltaic array equivalent polymerization model, as shown in fig. 1, comprising the following steps:
s1: and establishing a photovoltaic cell engineering mathematical model under the normal illumination condition according to the technical parameters of the photovoltaic array.
The technical parameters of the photovoltaic array include: short-circuit current I of photovoltaic cellsc_refOpen circuit voltage Uoc_refMaximum power point current Im_refMaximum power point voltage Um_refAnd maximum power point power Pm_ref。
The photovoltaic cell engineering mathematical model under the normal illumination condition is as follows:
Figure BDA0002836105510000041
in the formula Icell_refAnd Ucell_refRespectively a photovoltaic cell in normal illuminationOutput current and output voltage under conditions; c1And C2Are intermediate variables in the calculation process.
S2: monitoring the illumination condition of the photovoltaic array in real time, and determining the illumination intensity variation delta G of each photovoltaic cell in the photovoltaic arrayij。ΔGijThe light intensity change value of the ith photovoltaic cell in the jth group photovoltaic group string in the light pointer array is indicated, wherein i is 1,2, …, Ns，j＝1,2,…,Np，ΔGijLess than or equal to 0. FIG. 2 is a structural diagram of a typical PV array of the present embodiment, as shown in FIG. 2, the PV array of the present embodiment is composed of NpEach photovoltaic group is formed by connecting photovoltaic groups in series and parallel, and each photovoltaic group is formed by NsEach photovoltaic cell is provided with an anti-parallel bypass diode. Meanwhile, diodes are connected in series on the branches of each photovoltaic group string, so that the problem of reverse current caused by voltage difference between the branches is solved. FIG. 3 is an equivalent circuit diagram of a photovoltaic cell in a photovoltaic array, as shown in FIG. 3, including an ideal power supply stream ILDiode Id, parallel resistor Rsh and series resistor Rs, ideal power supply flow ILAnd a series resistor Rs connected in series and becoming the output terminal of the photovoltaic cell; the diode Id and the parallel resistor Rsh are in turn connected to the ideal power supply flow ILAnd (4) connecting in parallel. RLIs a load resistor. The parallel resistance Rsh is designed based on the recombination of the carrier generation and the surface leakage current along the edge of the battery, and the series resistance Rs is an equivalent series resistance obtained by compounding the surface resistance of the diffusion top region, the battery body resistance, the ohmic resistance between the upper electrode and the lower electrode, and the like.
S3: and correcting the photovoltaic cell engineering mathematical model of the photovoltaic array according to the illumination intensity variation.
The process of correcting the photovoltaic cell engineering mathematical model of the photovoltaic array in the step S3 includes the following steps: correcting the short-circuit current of the photovoltaic cell according to the change condition of the illumination condition; the correction equation of the short-circuit current of the photovoltaic cell is as follows:
Figure BDA0002836105510000051
in the formula IscijIs short-circuit current G of ith photovoltaic cell in jth photovoltaic string in the optical probe array under any illumination conditionrefLight intensity under normal conditions, GijΔ G is the intensity of light actually received by the photovoltaic cellijIs the corresponding illumination intensity variation; a is a calculation coefficient, K is an illumination intensity influence coefficient, Delta T is the working temperature variation of the photovoltaic cell, and Delta Tij＝KGrefΔGij，FI(ΔGij) Is a correction factor for the short-circuit current.
Correcting the open-circuit voltage of the photovoltaic cell according to the change condition of the illumination condition, wherein the correction equation of the open-circuit voltage of the photovoltaic cell is as follows:
Uocij＝Uoc_ref(1-cΔTij)(1+bΔGij)
＝Uoc_ref[-bcKGrefΔ2Gij+(b-cKGref)ΔGij+1]
＝FU(ΔGij)Uoc_ref
wherein, UocijThe open-circuit voltage of the ith photovoltaic cell in the jth group of photovoltaic group string in the light needle array under any illumination condition, b and c are calculation coefficients, FU(ΔGij) Is a correction factor for the open circuit voltage.
And establishing a corrected engineering mathematical model of the photovoltaic cell according to the corrected short-circuit current and the corrected open-circuit voltage. The corrected engineering mathematical model of the photovoltaic cell is as follows:
Figure BDA0002836105510000061
in the formula IijAnd UijRespectively is the actual output current and the actual output voltage of the ith photovoltaic cell in the jth group of photovoltaic group strings in the light needle array under any illumination condition, FI(ΔGij) As correction factor for short-circuit current, FU(ΔGij) Δ G as a correction factor for the open-circuit voltageijFirst in the light pointer arrayAnd the illumination intensity change value of the ith photovoltaic cell in the j groups of photovoltaic group strings.
S4: and sequencing the illumination intensity variation of the photovoltaic cells in each photovoltaic group string, and establishing a photovoltaic cell equivalent model of each photovoltaic group string.
The process of establishing the photovoltaic cell equivalent model of each photovoltaic group string comprises the following steps:
s4.1 pairs of N in jth group photovoltaic group stringsThe magnitude of the illumination intensity variation of the individual photovoltaic cells is sorted, and N in the jth photovoltaic group string is determinedsActual short circuit current values for individual photovoltaic cells;
s4.2, carrying out on the size of each photovoltaic cell according to the actual short-circuit current value, establishing an equivalent output model of the jth group of photovoltaic strings, and assuming Isc_ref＝Isc0j≥Isc1j≥…Iscij≥…≥IscNsj>0; wherein, IscijIs the short circuit current of the ith photovoltaic cell in the jth string of photovoltaic strings.
The formula of the equivalent output model of the jth group of photovoltaic string in step S4.2 is:
Figure BDA0002836105510000062
in the formula Istring_jAnd Ustring_jThe actual equivalent output current and the actual equivalent output voltage of the jth photovoltaic string under any illumination condition are respectively.
And S4.3, completing the equivalent output models of all the photovoltaic group strings according to the equivalent output model of the jth photovoltaic group string.
S5: and polymerizing the photovoltaic cell equivalent models of the photovoltaic group strings to finally generate an equivalent polymerization model of the whole photovoltaic array so as to determine the specific working state of each photovoltaic cell in the photovoltaic array.
The formula of the equivalent polymerization model of the whole photovoltaic array is as follows:
Figure BDA0002836105510000063
wherein, IoutAnd UoutThe actual output current and the actual output voltage of the photovoltaic array under any illumination condition, NpThe number of the photovoltaic string is shown.
In the segmented photovoltaic array equivalent aggregation modeling process, the illumination intensity change condition of each photovoltaic cell needs to be monitored in real time according to the actual application condition, and the photovoltaic cells, the photovoltaic string and the equivalent output model of the photovoltaic array need to be synchronously corrected, so that the accuracy of the external output characteristic of the photovoltaic array aggregation model is ensured.
The invention provides a photovoltaic array equivalent aggregation model modeling method based on segmentation aiming at a typical photovoltaic array structure, and the method only needs to pay attention to a single variable of illumination intensity variation when photovoltaic parameter correction is considered, so that certain convenience is brought to actual monitoring work, the specific working state of each photovoltaic cell in a photovoltaic array is realized, and the method is suitable for modeling photovoltaic power generation systems under different scale levels. The established equivalent polymerization model greatly shortens the calculation time and saves the calculation cost on the basis of ensuring the accuracy of the output external characteristics, has generality and can be effectively applied to various complex working conditions.
Example two
Based on the same inventive concept, the embodiment provides a segmented photovoltaic array equivalent aggregation model modeling system, which includes:
the normal illumination modeling module is used for establishing a photovoltaic cell engineering mathematical model under the normal illumination condition according to the technical parameters of the photovoltaic array;
the illumination monitoring module is used for monitoring the illumination condition of the photovoltaic array in real time and determining the illumination intensity variation of each photovoltaic cell in the photovoltaic array;
the model correction module is used for correcting a photovoltaic cell engineering mathematical model of the photovoltaic array according to the illumination intensity variation;
the string equivalent modeling module is used for sequencing the illumination intensity variation of the photovoltaic cells in each photovoltaic string and establishing a photovoltaic cell equivalent model of each photovoltaic string;
and the array equivalent modeling module is used for aggregating the photovoltaic cell equivalent models of the photovoltaic group strings to finally generate an equivalent aggregation model of the whole photovoltaic array so as to determine the specific working state of each photovoltaic cell in the photovoltaic array.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims. The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (10)

1. A modeling method for a segmented photovoltaic array equivalent polymerization model is characterized by comprising the following steps:
s1: establishing a photovoltaic cell engineering mathematical model under a normal illumination condition according to the technical parameters of the photovoltaic array;
s2: monitoring the illumination condition of the photovoltaic array in real time, and determining the illumination intensity variation of each photovoltaic cell in the photovoltaic array;
s3: correcting the photovoltaic cell engineering mathematical model of the photovoltaic array according to the illumination intensity variation;
s4: sequencing the illumination intensity variation of the photovoltaic cells in each photovoltaic group string, and establishing a photovoltaic cell equivalent model of each photovoltaic group string;
s5: and polymerizing the photovoltaic cell equivalent models of the photovoltaic group strings to finally generate an equivalent polymerization model of the whole photovoltaic array so as to determine the specific working state of each photovoltaic cell in the photovoltaic array.
2. The method for modeling an equivalent aggregation model of a segmented photovoltaic array according to claim 1, wherein the technical parameters of the photovoltaic array in the step S1 include: short-circuit current I of photovoltaic cellsc_refOpen circuit voltage Uoc_refMaximum power point current Im_refMaximum power point voltage Um_refAnd maximum power point power Pm_ref。
3. The method for modeling an equivalent aggregation model of a segmented photovoltaic array according to claim 2, wherein the mathematical model of photovoltaic cell engineering under normal lighting conditions in step S1 is:
Figure FDA0002836105500000011
in the formula Icell_refAnd Ucell_refRespectively output current and output voltage of the photovoltaic cell under the normal illumination condition; c1And C2Are intermediate variables in the calculation process.
4. The modeling method of the equivalent polymerization model of photovoltaic array according to claim 3, wherein the step S3 of modifying the mathematical model of photovoltaic cell engineering of photovoltaic array comprises the following steps: correcting the short-circuit current of the photovoltaic cell according to the change condition of the illumination condition; and correcting the open-circuit voltage of the photovoltaic cell according to the change condition of the illumination condition, and establishing a corrected engineering mathematical model of the photovoltaic cell according to the corrected short-circuit current and the corrected open-circuit voltage.
5. The modeling method of a photovoltaic array equivalent polymerization model according to claim 4, wherein the modified engineering mathematical model of the photovoltaic cell is:
Figure FDA0002836105500000012
in the formula IijAnd UijRespectively is the actual output current and the actual output voltage of the ith photovoltaic cell in the jth group of photovoltaic group strings in the light needle array under any illumination condition, FI(ΔGij) As correction factor for short-circuit current, FU(ΔGij) Δ G as a correction factor for the open-circuit voltageijAnd indicating the illumination intensity change value of the ith photovoltaic cell in the jth group of photovoltaic group strings in the light pointer array.
6. The modeling method of the equivalent polymerization model of the photovoltaic array according to claim 4, wherein the correction equation of the short-circuit current of the photovoltaic cell is:
Figure FDA0002836105500000021
in the formula IscijIs short-circuit current G of ith photovoltaic cell in jth photovoltaic string in the optical probe array under any illumination conditionrefLight intensity under normal conditions, GijΔ G is the intensity of light actually received by the photovoltaic cellijIs the corresponding illumination intensity variation; a is a calculation coefficient, K is an illumination intensity influence coefficient, Delta T is the working temperature variation of the photovoltaic cell, and Delta Tij＝KGrefΔGij，FI(ΔGij) Correction coefficient for short circuit current;
the correction equation of the open-circuit voltage of the photovoltaic cell is as follows:
Uocij＝Uoc_ref(1-cΔTij)(1+bΔGij)
＝Uoc_ref[-bcKGrefΔ2Gij+(b-cKGref)ΔGij+1]
＝FU(ΔGij)Uoc_ref
wherein, UocijIs the second group of photovoltaic strings in the jth group of the optical needle arrayOpen circuit voltage of i photovoltaic cells under any illumination condition, b and c are calculation coefficients, FU(ΔGij) Is a correction factor for the open circuit voltage.
7. The modeling method of the equivalent aggregation model of the photovoltaic array according to claim 6, wherein the process of establishing the equivalent model of the photovoltaic cells of each photovoltaic string in the step 4 is as follows:
s4.1 pairs of N in jth group photovoltaic group stringsSequencing the illumination intensity variation of the individual photovoltaic cells, and determining N in the jth photovoltaic stringsActual short circuit current values for individual photovoltaic cells;
s4.2, according to the actual short-circuit current value, carrying out on the size of each photovoltaic cell, and establishing an equivalent output model of the jth group of photovoltaic strings;
and S4.3, completing the equivalent output models of all the photovoltaic group strings according to the equivalent output model of the jth group of photovoltaic group strings.
8. The modeling method of the equivalent aggregation model of the photovoltaic array according to claim 7, wherein the formula of the equivalent output model of the jth group of photovoltaic strings in the step S4.2 is:
Figure FDA0002836105500000031
in the formula Istring_jAnd Ustring_jThe actual equivalent output current and the actual equivalent output voltage of the jth photovoltaic string under any illumination condition are respectively.
9. The modeling method for equivalent aggregation model of photovoltaic array according to claim 8, wherein the formula of the equivalent aggregation model of the entire photovoltaic array in step S5 is:
Figure FDA0002836105500000032
wherein, IoutAnd UoutThe actual output current and the actual output voltage of the photovoltaic array under any illumination condition, NpThe number of the photovoltaic string is shown.
10. A segmented photovoltaic array equivalent polymerization model modeling system, comprising:
the normal illumination modeling module is used for establishing a photovoltaic cell engineering mathematical model under the normal illumination condition according to the technical parameters of the photovoltaic array;
the illumination monitoring module is used for monitoring the illumination condition of the photovoltaic array in real time and determining the illumination intensity variation of each photovoltaic cell in the photovoltaic array;
the model correction module is used for correcting the photovoltaic cell engineering mathematical model of the photovoltaic array according to the illumination intensity variation;
the string equivalent modeling module is used for sequencing the illumination intensity variation of the photovoltaic cells in each photovoltaic string and establishing a photovoltaic cell equivalent model of each photovoltaic string;
and the array equivalent modeling module is used for aggregating the photovoltaic cell equivalent models of the photovoltaic group strings to finally generate an equivalent aggregation model of the whole photovoltaic array so as to determine the specific working state of each photovoltaic cell in the photovoltaic array.
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