CN116596194B - Photovoltaic array running state dividing method, system and device - Google Patents
Photovoltaic array running state dividing method, system and device Download PDFInfo
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Abstract
The invention discloses a method, a system and a device for dividing the running state of a photovoltaic array, wherein the method comprises the following steps: s1, acquiring output power in the photovoltaic array operation data and irradiance and temperature in a weather station, deleting irradiance of which irradiance is lower than a certain value, output power corresponding to irradiance of which irradiance is lower than a certain value and temperature corresponding to irradiance of which irradiance is lower than a certain value, and obtaining modified photovoltaic array operation data after deleting; s2, calculating the photovoltaic array efficiency E based on the modified photovoltaic array operation data; s3, calculating the stability of historical operation data of the photovoltaic array based on the photovoltaic array efficiency E to obtain a stability index S; and S4, ranking and dividing the operation state of the photovoltaic array according to the stability index S of the photovoltaic array. The invention can realize the division of the operation state of the photovoltaic array.
Description
Technical Field
The invention relates to the field of photovoltaic array operation state division, in particular to a photovoltaic array operation state division method, system and device.
Background
Photovoltaic power generation has been developed very rapidly in recent years as an important renewable energy power generation mode, and at the same time, it brings great challenges to the operation and planning of photovoltaic power stations. The photovoltaic power generation output has obvious randomness and fluctuation, the types of faults of the photovoltaic array are various and mutually coupled, and the data which can be acquired in the operation process of the photovoltaic array only have current and voltage, so that the problem of incomplete information brought about makes the extraction of the fault characteristics of the photovoltaic array difficult. The state characteristic information of the photovoltaic array is submerged in the data with fluctuation and similarity characteristics, so that the state characteristic information is difficult to directly apply to analysis of the running state of the photovoltaic array, the state analysis algorithm is difficult to effectively implement, and development of photovoltaic digital construction and improvement of the intelligent operation and maintenance level of the photovoltaic power station are restrained.
Disclosure of Invention
The invention aims to provide a method, a system and a device for dividing the running state of a photovoltaic array, and aims to solve the problem of dividing the running state of the photovoltaic array.
The invention provides a method for dividing the running state of a photovoltaic array, which comprises the following steps:
s1, acquiring output power in the photovoltaic array operation data and irradiance and temperature in a weather station, deleting irradiance of which irradiance is lower than a certain value, output power corresponding to irradiance of which irradiance is lower than a certain value and temperature corresponding to irradiance of which irradiance is lower than a certain value, and obtaining modified photovoltaic array operation data after deleting;
s2, calculating the photovoltaic array efficiency E based on the modified photovoltaic array operation data;
s3, calculating the stability of historical operation data of the photovoltaic array based on the photovoltaic array efficiency E to obtain a stability index S;
and S4, ranking and dividing the operation state of the photovoltaic array according to the stability index S of the photovoltaic array.
The invention also provides a photovoltaic array running state dividing system, which comprises:
and the acquisition module is used for: the method comprises the steps of acquiring output power in photovoltaic array operation data and irradiance and temperature in a weather station, deleting irradiance of which irradiance is lower than a certain value, output power corresponding to irradiance of which irradiance is lower than a certain value and temperature corresponding to irradiance of which irradiance is lower than a certain value, and obtaining modified photovoltaic array operation data after deleting;
and an efficiency module: the method comprises the steps of calculating photovoltaic array efficiency E based on modified photovoltaic array operation data;
and a stability module: the method comprises the steps of calculating the stability of historical operation data of a photovoltaic array based on the efficiency E of the photovoltaic array to obtain a stability index S;
the dividing module: the method is used for ranking and dividing the operation states of the photovoltaic array according to the stability index S of the photovoltaic array.
The embodiment of the invention also provides a device for dividing the running state of the photovoltaic array, which comprises the following steps: a memory, a processor and a computer program stored on the memory and executable on the processor, which when executed by the processor, performs the steps of the method described above.
The embodiment of the invention also provides a computer readable storage medium, wherein the computer readable storage medium stores an information transmission implementation program, and the program realizes the steps of the method when being executed by a processor.
By adopting the embodiment of the invention, the operation state division of the photovoltaic array can be realized.
The foregoing description is only an overview of the present invention, and is intended to provide a more clear understanding of the technical means of the present invention, as it is embodied in accordance with the present invention, and to make the above and other objects, features and advantages of the present invention more apparent, as it is embodied in the following detailed description of the invention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a method for dividing the operating state of a photovoltaic array according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a calculation result of a method for dividing the operation state of a photovoltaic array according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the stability of the method for dividing the operating state of the photovoltaic array according to the embodiment of the present invention;
FIG. 4 is a schematic diagram of a smoothness level of a method for dividing the operational state of a photovoltaic array according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a photovoltaic array operating condition partitioning system according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a photovoltaic array operation status dividing apparatus according to an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be clearly and completely described in connection with the embodiments, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Method embodiment
According to an embodiment of the present invention, a method for dividing an operating state of a photovoltaic array is provided, and fig. 1 is a flowchart of the method for dividing an operating state of a photovoltaic array according to an embodiment of the present invention, as shown in fig. 1, specifically including:
s1, acquiring output power in the photovoltaic array operation data and irradiance and temperature in a weather station, deleting irradiance of which irradiance is lower than a certain value, output power corresponding to irradiance of which irradiance is lower than a certain value and temperature corresponding to irradiance of which irradiance is lower than a certain value, and obtaining modified photovoltaic array operation data after deleting;
s2, calculating the photovoltaic array efficiency E based on the modified photovoltaic array operation data;
s2 specifically comprises:
the actual power generation amount U is calculated, and the formula is as follows:
T t -T 0 ＝T P ；
wherein T is 0 To start acquisition time, T t To terminate the acquisition time T p Is T 0 To T t P is T 0 To T t Output power therebetween;
calculating theoretical generated energy U t The formula is as follows:
U t ＝(R/1000)·P rated
wherein P is rated For nominal capacity of the photovoltaic array installation, R represents T p Total radiation quantity received by the unit square matrix surface in time;
taking the ratio of the actual power generation amount to the theoretical power generation amount of the photovoltaic array at the same moment as a photovoltaic array efficiency calculation index E, and calculating the formula:
s3, calculating the stability of historical operation data of the photovoltaic array based on the photovoltaic array efficiency E to obtain a stability index S;
s3 specifically comprises: and carrying out stability calculation on historical operation data of the photovoltaic array based on the photovoltaic array efficiency E to obtain a stability index S, wherein the calculation formula is as follows:
wherein E is i，T For the efficiency of the ith photovoltaic array at the current time t, E i，t-1 For the efficiency of the ith photovoltaic array at the previous time t-1, t s For the start time, t e For the expiration time, time window t=t e -t s ，The time window represents the average fluctuation value of the photovoltaic array efficiency in the T time, and Deltat is the acquisition time interval.
And S4, ranking and dividing the operation state of the photovoltaic array according to the stability index S of the photovoltaic array.
S4 specifically comprises the following steps: and sequencing the running state stability S of the total station photovoltaic array from large to small, and dividing the running state of the photovoltaic array according to the sequencing.
The specific implementation method is as follows:
the photovoltaic array state evaluation method comprises the following steps:
s11, acquiring historical operation data and historical meteorological data of a photovoltaic array;
s21, calculating the efficiency E of the photovoltaic array;
s31, calculating a photovoltaic array efficiency stability index S;
s41, dividing the running state of the photovoltaic array based on the stability rank.
The specific method of step S11 is as follows: collecting output power in operation data of a photovoltaic array and irradiance and temperature of a weather station, and deleting irradiance to be lower than 30W/m 2 Irradiance data, corresponding power, corresponding temperature data.
The specific method of step S21 is as follows: the actual generated energy U is the power at T p Integration of the time period; theoretical power generation U t Is T p Array power generation under STC condition in time period, namely nominal capacity P of photovoltaic array installation rated And T is p The total radiation quantity R received by the unit square matrix surface in the time period is 1kW/m corresponding to STC condition 2 Is a product of the ratios of (c).
The actual power generation amount U is calculated, and the formula is as follows:
T t -T 0 ＝T p ；
wherein T is 0 To start acquisition time, T t To terminate the acquisition time T p Is T 0 To T t P is T 0 To T t Output power therebetween;
calculating theoretical generated energy U t The formula is as follows:
U t ＝(R/1000)·P rated
wherein P is rated For nominal capacity of the photovoltaic array installation, R represents T p Total radiation quantity received by the unit square matrix surface in time;
taking the ratio of the actual power generation amount to the theoretical power generation amount of the photovoltaic array at the same moment as a photovoltaic array efficiency calculation index E, and calculating the formula:
wherein T is 0 To start acquisition time，T t To terminate the acquisition time. And taking the ratio of the actual power generation amount to the theoretical power generation amount of the photovoltaic array at the same moment as a photovoltaic array efficiency calculation index E, and calculating the formula:
the specific method of step S31 is as follows: and performing stability calculation on historical operation data of the photovoltaic array, and taking a stability index S as a dynamic performance index of the photovoltaic array, wherein the expression is as follows:
wherein E is i，t For the efficiency of the ith photovoltaic array at the current time t, E i，t-1 For the efficiency of the ith photovoltaic array at the previous time t-1, t s For the start time, t e For the expiration time, time window t=t e -t s ，The time window represents the average fluctuation value of the photovoltaic array efficiency in the T time, and Deltat is the acquisition time interval.
The specific method of step S41 is as follows: the running state stability S of the total station array is ordered from large to small, the first 15% is defined as an excellent array, the 15% -55% is defined as a good array, the 55% -85% is defined as a medium array, and the last 15% is defined as an inefficient array.
In the specific implementation process, the data are derived from a certain power station in China, and the total of 74 centralized inverters and 553 arrays, the system collects the power data of the photovoltaic arrays every 10 minutes, and the system is provided with a weather station and can be used for collecting weather data such as irradiance, temperature, wind speed and the like. The selected time period is 1 month, historical operation data of the photovoltaic array is cleaned, and irradiance at night and in daytime is lower than 30W/m 2 Time power, temperature, irradiance data, calculate the efficiency index E of the modified photovoltaic power plant total station array for 30 days, FIG. 2The calculation result schematic diagram of the photovoltaic array running state dividing method of the embodiment of the invention; as shown in fig. 2, the calculation result of the daily average efficiency E shows that the efficiency E of the same array on different dates has irregularity and fluctuation, and the different arrays have similarity and difference, so that erroneous judgment is easily caused by direct application. Fig. 3 is a schematic diagram of stability of a photovoltaic array operation state dividing method according to an embodiment of the present invention, where a stability calculation result and a grade distribution situation are obtained by calculating a stability S of a total station photovoltaic array efficiency, as shown in fig. 3, and in order to clearly show a grade dividing result, an array efficiency distribution situation under different grades is compared, and fig. 4 is a schematic diagram of stability grade of a photovoltaic array operation state dividing method according to an embodiment of the present invention, as shown in fig. 4, it can be seen that efficiency stability decreases with a decrease of grade, and abnormal points increase with a decrease of grade.
In summary, the method considers the comprehensive efficiency of the photovoltaic array and the volatility of the operation data, establishes the comprehensive efficiency index E of the photovoltaic array, determines the operation state of the photovoltaic array by calculating the stability of the efficiency index and arranging the operation state, can find the array in an abnormal state, and can be used for early warning and executing related behaviors.
1. The method constructs the efficiency index E capable of reflecting the comprehensive state of the photovoltaic array, calculates the stability S through the efficiency index and arranges the stability S side by side, and can determine the running state of the array.
2. The established stability index S effectively solves the problem of difficult application caused by irregular fluctuation of the efficiency index of the photovoltaic array, and can effectively reflect the state change of the photovoltaic array.
3. The grading can intuitively reflect the running state of the array, can find the array in an abnormal state, and can be used for early warning and execution of related behaviors.
System embodiment
According to an embodiment of the present invention, a system for dividing an operating state of a photovoltaic array is provided, and fig. 5 is a schematic diagram of a system for dividing an operating state of a photovoltaic array according to an embodiment of the present invention, as shown in fig. 5, specifically including:
and the acquisition module is used for: the method comprises the steps of acquiring output power in photovoltaic array operation data and irradiance and temperature in a weather station, deleting irradiance of which irradiance is lower than a certain value, output power corresponding to irradiance of which irradiance is lower than a certain value and temperature corresponding to irradiance of which irradiance is lower than a certain value, and obtaining modified photovoltaic array operation data after deleting;
and an efficiency module: the method comprises the steps of calculating photovoltaic array efficiency E based on modified photovoltaic array operation data;
and a stability module: the method comprises the steps of calculating the stability of historical operation data of a photovoltaic array based on the efficiency E of the photovoltaic array to obtain a stability index S;
the dividing module: the method is used for ranking and dividing the operation states of the photovoltaic array according to the stability index S of the photovoltaic array.
The efficiency module is specifically used for:
the actual power generation amount U is calculated, and the formula is as follows:
T t -T 0 ＝T p ；
wherein T is 0 To start acquisition time, T t To terminate the acquisition time T p Is T 0 To T t P is T 0 To T t Output power therebetween;
calculating theoretical generated energy U t The formula is as follows:
U t ＝(R/1000)·P rated
wherein P is rated For nominal capacity of the photovoltaic array installation, R represents T p Total radiation quantity received by the unit square matrix surface in time;
taking the ratio of the actual power generation amount to the theoretical power generation amount of the photovoltaic array at the same moment as a photovoltaic array efficiency calculation index E, and calculating the formula:
the stationarity module is specifically configured to: and carrying out stability calculation on historical operation data of the photovoltaic array based on the photovoltaic array efficiency E to obtain a stability index S, wherein the calculation formula is as follows:
wherein E is i，t For the efficiency of the ith photovoltaic array at the current time t, E i，t-1 For the efficiency of the ith photovoltaic array at the previous time t-1, t s For the start time, t e For the expiration time, time window t=t e -t s ，The time window represents the average fluctuation value of the photovoltaic array efficiency in the T time, and Deltat is the acquisition time interval.
The dividing module is specifically used for: and sequencing the running state stability S of the total station photovoltaic array from large to small, and dividing the running state of the photovoltaic array according to the sequencing.
The embodiment of the present invention is a system embodiment corresponding to the above method embodiment, and specific operations of each module may be understood by referring to the description of the method embodiment, which is not repeated herein.
Device embodiment 1
An embodiment of the present invention provides a device for dividing an operation state of a photovoltaic array, as shown in fig. 6, including: the steps of the method embodiments described above are implemented by the memory 60, the processor 62, and a computer program stored on the memory 60 and executable on the processor 62, when the computer program is executed by the processor.
Device example two
The embodiment of the present invention provides a computer-readable storage medium, on which an implementation program for information transmission is stored, which when executed by the processor 62 implements the steps of the method embodiment described above.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; and these modifications or substitutions may be made to the technical solutions of the embodiments of the present invention without departing from the spirit of the corresponding technical solutions.
Claims (6)
1. The method for dividing the operation state of the photovoltaic array is characterized by comprising the following steps of:
s1, acquiring output power in the photovoltaic array operation data and irradiance and temperature in a weather station, deleting irradiance of which irradiance is lower than a certain value, output power corresponding to irradiance of which irradiance is lower than a certain value and temperature corresponding to irradiance of which irradiance is lower than a certain value, and obtaining modified photovoltaic array operation data after deleting;
s2, calculating the photovoltaic array efficiency E based on the modified photovoltaic array operation data;
s3, calculating the stability of historical operation data of the photovoltaic array based on the photovoltaic array efficiency E to obtain a stability index S;
s4, ranking and dividing the operation state of the photovoltaic array according to the stability index S of the photovoltaic array;
s2 specifically comprises:
the actual power generation amount U is calculated, and the formula is as follows:
T t -T 0 ＝T p ；
wherein T is 0 To start acquisition time, T t To terminate the acquisition time T p Is T 0 To T t P is T 0 To T t Output power therebetween;
calculating theoretical generated energy U t The formula is as follows:
U t ＝(R/1000)·P rated ；
wherein P is rated For nominal capacity of the photovoltaic array installation, R represents T p Total radiation quantity received by the unit square matrix surface in time;
taking the ratio of the actual power generation amount to the theoretical power generation amount of the photovoltaic array at the same moment as a photovoltaic array efficiency calculation index E, and calculating the formula:
s3 specifically comprises: and carrying out stability calculation on historical operation data of the photovoltaic array based on the photovoltaic array efficiency E to obtain a stability index S, wherein the calculation formula is as follows:
wherein E is i，t For the efficiency of the ith photovoltaic array at the current time t, E i，t-1 For the efficiency of the ith photovoltaic array at the previous time t-1, t s For the start time, t e For the expiration time, time window t=t e -t s ，The time window represents the average fluctuation value of the photovoltaic array efficiency in the T time, and Deltat is the acquisition time interval.
2. The method according to claim 1, wherein S4 specifically comprises: and sequencing the running state stability S of the total station photovoltaic array from large to small, and dividing the running state of the photovoltaic array according to the sequencing.
3. A photovoltaic array operating condition dividing system, comprising:
and the acquisition module is used for: the method comprises the steps of acquiring output power in photovoltaic array operation data and irradiance and temperature in a weather station, deleting irradiance of which irradiance is lower than a certain value, output power corresponding to irradiance of which irradiance is lower than a certain value and temperature corresponding to irradiance of which irradiance is lower than a certain value, and obtaining modified photovoltaic array operation data after deleting;
and an efficiency module: the method comprises the steps of calculating photovoltaic array efficiency E based on modified photovoltaic array operation data;
and a stability module: the method comprises the steps of calculating the stability of historical operation data of a photovoltaic array based on the efficiency E of the photovoltaic array to obtain a stability index S;
the dividing module: the method comprises the steps of ranking and dividing the operation states of the photovoltaic array according to the stability index S of the photovoltaic array;
the efficiency module is specifically used for:
the actual power generation amount U is calculated, and the formula is as follows:
T t -T 0 ＝T p ；
wherein T is 0 To start acquisition time, T t To terminate the acquisition time T p Is T 0 To T t P is T 0 To T t Output power therebetween;
calculating theoretical generated energy U t The formula is as follows:
U t ＝(R/1000)·P rated ；
wherein P is rated For nominal capacity of the photovoltaic array installation, R represents T p Total radiation quantity received by the unit square matrix surface in time;
taking the ratio of the actual power generation amount to the theoretical power generation amount of the photovoltaic array at the same moment as a photovoltaic array efficiency calculation index E, and calculating the formula:
the stationarity module is specifically configured to: and carrying out stability calculation on historical operation data of the photovoltaic array based on the photovoltaic array efficiency E to obtain a stability index S, wherein the calculation formula is as follows:
wherein E is i，t For the efficiency of the ith photovoltaic array at the current time t, E i，t-1 For the efficiency of the ith photovoltaic array at the previous time t-1, t s For the start time, t e For the expiration time, time window t=t e -t s ，The time window represents the average fluctuation value of the photovoltaic array efficiency in the T time, and Deltat is the acquisition time interval.
4. A system according to claim 3, wherein the partitioning module is specifically configured to: and sequencing the running state stability S of the total station photovoltaic array from large to small, and dividing the running state of the photovoltaic array according to the sequencing.
5. A photovoltaic array operating condition dividing apparatus, comprising: memory, a processor and a computer program stored on the memory and executable on the processor, which when executed by the processor, implements the steps of the photovoltaic array operating state partitioning method of any one of claims 1 to 2.
6. A computer-readable storage medium, wherein a program for implementing information transfer is stored on the computer-readable storage medium, and the program when executed by a processor implements the steps of the method for dividing the operation state of a photovoltaic array according to any one of claims 1 to 2.
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