CN111193289B - Photovoltaic power station parallel mismatch adjusting method and device - Google Patents
Photovoltaic power station parallel mismatch adjusting method and device Download PDFInfo
- Publication number
- CN111193289B CN111193289B CN202010088159.9A CN202010088159A CN111193289B CN 111193289 B CN111193289 B CN 111193289B CN 202010088159 A CN202010088159 A CN 202010088159A CN 111193289 B CN111193289 B CN 111193289B
- Authority
- CN
- China
- Prior art keywords
- string
- current
- screened
- inverter
- group
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
Landscapes
- Control Of Electrical Variables (AREA)
- Inverter Devices (AREA)
Abstract
The embodiment of the invention discloses a method and a device for adjusting parallel mismatch of a photovoltaic power station. The adjusting method comprises the following steps: selecting a typical day of each inverter, and acquiring current data of each group of strings of each inverter on the typical day; determining a reference string current curve based on the current data, and determining a string type of the string to be screened according to a current peak value moment corresponding to the reference string current curve and a current peak value moment of the string to be screened; and determining to adjust the string access mode of the inverter according to the string access mode of the inverter corresponding to the string type of the string to be screened. According to the technical scheme of the embodiment of the invention, the loss of the parallel mismatch of the photovoltaic power station is reduced, and the power generation capacity of the photovoltaic power station is improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of power generation of photovoltaic power stations, in particular to a method and a device for adjusting parallel mismatch of photovoltaic power stations.
Background
Because general mountain region condition is comparatively complicated, build photovoltaic power plant on the mountain region and need promote space utilization as far as possible, and photovoltaic power plant is when building the station, and MPPT meets according to collection flow box branch road serial number under most inverter, if there is the problem of parallel mismatch, is very difficult to discover.
At present, most of operation and maintenance of photovoltaic power stations use the dispersion rate to carry out fault diagnosis and analysis on the photovoltaic power stations, or use IV scanning to detect the photovoltaic power stations, or use the scheme of recombining the MPPT under most inverters of the photovoltaic power stations by using the maximum power point, however, the above methods cannot effectively screen out the problem of parallel mismatch and provide a solution.
The photovoltaic power station is analyzed by using the dispersion ratio, only the difference condition of the power generation of the photovoltaic power station at the same moment or within a period of time can be analyzed, and the problem at a deep level is difficult to find; because the IV scanning is a transient value aiming at the detection of a certain moment, the detection of the photovoltaic power station by using the IV scanning is difficult to accurately determine the group strings with inconsistent orientation during the installation; different groups of strings have different output characteristics due to the difference between the environment and the parameters of the strings, and when the number of the connected groups of strings is greater than 1 under the same MPPT of the inverter, the problem of parallel mismatch is inevitable. When the orientations are different, or a shielded group string and an unshielded group string are connected to the same MPPT (the same MPPT of the current group string inverter is mostly connected to 2 strings or 3 strings), the problem of parallel mismatch is particularly serious, the MPPT under most inverters of a photovoltaic power station is recombined by using the maximum power point, so that the phenomenon that the MPPT is trapped into local optimization is difficult to avoid, and the combination scheme is adjusted ceaselessly can occur.
Disclosure of Invention
The embodiment of the invention provides a method and a device for adjusting photovoltaic power station parallel mismatch, which are used for reducing photovoltaic power station parallel mismatch loss and improving the power generation capacity of a photovoltaic power station.
In a first aspect, an embodiment of the present invention provides a method for adjusting a parallel mismatch of a photovoltaic power station, where the method includes:
selecting a typical day of each inverter, and acquiring current data of each group of strings of each inverter on the typical day;
determining a reference string current curve based on the current data, and determining a string type of the string to be screened according to a current peak value moment corresponding to the reference string current curve and a current peak value moment of the string to be screened;
and determining to adjust the string access mode of the inverter according to the string access mode of the inverter corresponding to the string type of the string to be screened.
Optionally, the selecting a typical day of each inverter includes:
and selecting dates as typical days when the absolute values of the second-order differences of the maximum group strings of the daily generated energy of the inverters are smaller than a preset daily generated energy threshold value.
Optionally, determining a reference string current curve based on the current data further includes:
determining current data of the string with the maximum generated energy according to the current data, and obtaining the daily discrete rate of the string current of each inverter according to the current data of the string with the maximum generated energy;
determining the reference string current profile based on the string current daily dispersion rate.
Optionally, determining the string type of the string to be screened according to the current peak time corresponding to the reference string current curve and the current peak time of the string to be screened, including:
if the current peak time corresponding to the reference string current curve is before the current peak time of the string to be screened, and the current value of each time before the current peak time corresponding to the reference string current curve is less than or equal to the current value of the time at which the string to be screened and each time are in one-to-one correspondence, determining that the string type of the string to be screened is a normal string; or the like, or, alternatively,
and if the current peak moment corresponding to the current curve of the reference string group is before the current peak moment of the string group to be screened, the current value of each moment before the current peak moment corresponding to the current curve of the reference string group is larger than the current value of the string group to be screened and the moment at which each moment is in one-to-one correspondence, and the current value of each moment before the current peak moment of the string group to be screened and the current curve of the reference string group is larger than or equal to the current value of the string group to be screened and the moment at which each moment is in one-to-one correspondence, determining that the string group type of the string group to be screened is a normal string group.
Optionally, determining the string type of the string to be screened according to the current peak time corresponding to the reference string current curve and the current peak time of the string to be screened, including:
and if the current peak time corresponding to the current curve of the reference group string is before the current peak time of the group string to be screened, the current value of each time before the current peak time corresponding to the current curve of the reference group string is larger than the current value of the group string to be screened and the time at which each time is in one-to-one correspondence, and the current value of each time before the current peak time of the group string to be screened and the current curve of the reference group string is smaller than the current value of the group string to be screened and the time at which each time is in one-to-one correspondence, determining that the group string type of the group string to be screened is a partial western group string.
Optionally, determining the string type of the string to be screened according to the current peak time corresponding to the reference string current curve and the current peak time of the string to be screened, including:
if the current peak time corresponding to the reference string current curve is behind the current peak time of the string to be screened and the current value of each time before the current peak time of the string to be screened is greater than or equal to the current value of the time at which the string to be screened and each time are in one-to-one correspondence, determining that the string type of the string to be screened is a normal string; or the like, or, alternatively,
and if the current peak time corresponding to the reference string current curve is behind the current peak time of the string to be screened, the current value of each time before the current peak time of the string to be screened is smaller than the current value of the string to be screened and the time at which each time is in one-to-one correspondence, and the current value of each time before the current peak time corresponding to the reference string current curve is smaller than or equal to the current value of the string to be screened and the time at which each time is in one-to-one correspondence, determining that the string type of the string to be screened is a normal string.
Optionally, determining a string type of the string to be screened according to a current peak time corresponding to the reference string current curve and a current peak time of the string to be screened, where the determining includes:
and if the current peak time corresponding to the current curve of the reference string group is behind the current peak time of the string group to be screened, the current value of each time before the current peak time of the string group to be screened is smaller than the current value of the time when the string group to be screened and the time are in one-to-one correspondence, and the current value of each time before the current peak time corresponding to the current curve of the reference string group is larger than the current value of the time when the string group to be screened and the time are in one-to-one correspondence, determining that the string group type of the string group to be screened is a east group string.
Optionally, before determining to adjust the string access manner of the inverter according to the string access manner of the inverter corresponding to the string type of the string to be screened, the method further includes:
selecting the inverter with the group string current daily dispersion rate larger than a preset dispersion rate threshold value of the inverter corresponding to the group string type of the group string to be screened as the inverter to be adjusted;
and determining the current string access mode of the inverter to be adjusted according to the number of strings of the inverter to be adjusted, the number of MPPT paths corresponding to the inverter to be adjusted and the number of connectable strings of each MPPT path.
Optionally, determining to adjust the string access manner of the inverter according to the string access manner of the inverter corresponding to the string type of the string to be screened, including:
and if the number of the MPPT paths corresponding to the inverter to be adjusted is larger than the number of the strings of the inverter to be adjusted, and the determined access mode of the target inverter strings is different from the access mode of the current inverter strings to be adjusted, determining to adjust the access mode of the strings of the inverter to be adjusted.
Optionally, the determining, according to the string access manner of the inverter corresponding to the string type of the string to be screened, that the string access manner of the inverter is adjusted includes:
and if the number of the MPPT paths corresponding to the inverter to be adjusted is less than or equal to the number of the strings of the inverter to be adjusted, and the number of the connectable strings of each MPPT path is not one, determining to adjust the string access mode of the inverter to be adjusted.
In a second aspect, an embodiment of the present invention further provides an apparatus for adjusting a parallel mismatch of a photovoltaic power station, where the apparatus includes:
the current data acquisition module is used for selecting a typical day of each inverter and acquiring current data of each group of strings of each inverter on the typical day;
the string type determining module is used for determining a reference string current curve based on the current data and determining the string type of the string to be screened according to the current peak value moment corresponding to the reference string current curve and the current peak value moment of the string to be screened;
and the group string access mode determining module is used for determining to adjust the group string access mode of the inverter according to the group string access mode of the inverter corresponding to the group string type of the group string to be screened.
According to the technical scheme of the embodiment of the invention, the typical day of each inverter is selected, and the current data of each group of the inverters in the typical day is obtained; determining a reference string current curve based on the current data, and determining a string type of the string to be screened according to a current peak value moment corresponding to the reference string current curve and a current peak value moment of the string to be screened; and determining to adjust the string access mode of the inverter according to the string access mode of the inverter corresponding to the string type of the string to be screened. The problem of can't effectually select parallelly connected mismatch problem among the prior art and give the solution is solved to realize reducing the parallelly connected mismatch loss of photovoltaic power plant, promote photovoltaic power plant generated energy.
Drawings
Fig. 1 is a flowchart of a method for adjusting a parallel mismatch of photovoltaic power stations according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for adjusting a parallel mismatch of photovoltaic power stations according to a second embodiment of the present invention;
fig. 3 is a flowchart of a method for adjusting a parallel mismatch of a photovoltaic power station according to a third embodiment of the present invention;
fig. 4 is a flowchart of a method for adjusting a parallel mismatch of a photovoltaic power station according to a fourth embodiment of the present invention;
fig. 5 is a structural diagram of an adjusting apparatus for photovoltaic power station parallel mismatch according to a fifth embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, specific embodiments of the present invention are described in further detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention.
It should be further noted that, for the convenience of description, only some but not all of the relevant aspects of the present invention are shown in the drawings. Before discussing exemplary embodiments in more detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart may describe the operations (or steps) as a sequential process, many of the operations can be performed in parallel, concurrently, or simultaneously. In addition, the order of the operations may be re-arranged. The process may be terminated when its operations are completed, but could have additional steps not included in the figure. The processes may correspond to methods, functions, procedures, subroutines, and the like.
Example one
Fig. 1 is a flowchart of a method for adjusting a photovoltaic power station parallel mismatch according to an embodiment of the present invention, where the embodiment is applicable to a situation where a photovoltaic power station inverter parallel mismatch is detected and adjusted, and the method may be executed by an apparatus for adjusting a photovoltaic power station parallel mismatch, and the apparatus may be implemented in a form of software and/or hardware. The method specifically comprises the following steps:
and S110, selecting a typical day of each inverter, and acquiring current data of each group string of each inverter on the typical day.
The typical day can be selected by determining a group string with the largest daily generated energy of a total station inverter of the photovoltaic power station and determining that the absolute values of the second-order differences are smaller than a preset daily generated energy threshold value.
The current data of each group string of the inverter on the typical day can be selected by a person skilled in the art according to actual needs, and the time period for acquiring the current data can be selected, alternatively, the current data of each group string of the inverter on the typical day can be selected from a time period of 8:00 to 17:30 in the time of one day, and current data of 40 points in total can be selected, and in addition, the granularity of the current data can also be selected, for example, one current data is selected in 15 minutes, or one current data is selected in 5 minutes, and one current data is selected in 1 minute.
And S120, determining a reference string current curve based on the current data, and determining the string type of the string to be screened according to the current peak value moment corresponding to the reference string current curve and the current peak value moment of the string to be screened.
The reference string current curve can be obtained by selecting an inverter with the value range of the daily dispersion rate of the string current being less than 10%, and the average value of the selected inverter string current is used as the reference string current curve.
In this embodiment, the inverter determination for determining the string current by the reference string current curve is not limited to that the value range of the daily dispersion rate of the string current is less than 10%, and may be any value less than 10%, and the selection of the value range of the daily dispersion rate of the string current may be set by a person skilled in the art according to actual needs, which is only an example here.
Specifically, current data of a group string with the maximum power generation amount is determined according to the current data, and a group string current daily dispersion rate of each inverter is obtained according to the current data of the group string with the maximum power generation amount; determining the reference string current profile based on the string current daily dispersion rate.
The group string current daily dispersion rate is obtained by weighting the group string current average value under each time data point by taking an inverter in a photovoltaic power station as a unit, and the group string current daily dispersion rate can be obtained by weighting the current of the group string with the large generating capacity of the total station in a typical day.
If the value range of the daily dispersion rate of the group of current is within 0-5%, the operation of each group of current of the inverter is stable; if the value range of the daily dispersion rate of the group of current is within 5-10%, the operation condition of each group of current of the inverter is good; if the value range of the daily dispersion rate of the group of current is within 10-20%, the operation condition of each group of current of the inverter needs to be improved; if the value range of the daily dispersion rate of the group of current exceeds 20 percent, the operation condition of the inverter is poor and the inverter needs to be rectified.
It can be understood that the daily dispersion rate of the string currents may reflect the operation condition of each string current on the corresponding inverter, and the higher the daily dispersion rate of the string currents, the higher the possibility that the inverter has the problem of parallel mismatch.
In addition, it can be understood that the operation condition of each group of string currents of the inverter is good because the value range of the daily dispersion rate of the group string currents is within 5-10%, and the smaller the value range of the selected daily dispersion rate of the group string currents is when the reference group string current curve is obtained, the higher the reference value of the finally determined reference group string current curve is.
Specifically, after a reference string current curve is determined, a string current of the inverter is analyzed by taking the inverter as a unit, that is, a current peak time corresponding to the reference string current curve is compared with a current peak time of a string to be screened of the inverter, and a current value at each time before the current peak time corresponding to the reference string current curve is combined with a current value at a time corresponding to the string to be screened and each time, and a current value at each time before the current peak time of the string to be screened and a current value at a time corresponding to the string to be screened and each time are compared, so that a string type of the string to be screened is determined.
The group string type may refer to a direction corresponding to a group string under the distributed photovoltaic power station inverter, and optionally, the group string type includes a normal group string, a westward group string, and a eastern group string.
Further, the string current data under the inverters on a plurality of typical days can be processed, so that a more accurate string type is determined, strings with inconsistent directions can be screened more effectively, and the judgment precision of the string type is improved effectively.
S130, determining to adjust the string access mode of the inverter according to the string access mode of the inverter corresponding to the string type of the string to be screened.
The string access mode of the inverter can be determined by the number of strings under the inverter, the number of MPPT paths of the inverter and the maximum number of strings capable of being connected under each MPPT path.
MPPT, which is called Maximum Power Point Tracking (Maximum Power Point Tracking), is an electrical system that enables a photovoltaic panel to output more electric energy by adjusting the operating state of an electrical module, and can effectively store direct current generated from a solar cell panel in a storage battery without causing environmental pollution.
It can be understood that in the present embodiment, MPPT recombination adjustment is performed on the inverter whose string current daily dispersion rate of the inverter is greater than the preset dispersion rate threshold. The value range of the daily dispersion rate of the string currents of the inverter is within 10-20%, which means that the operation condition of the string currents of each group of the inverter needs to be improved, the value of the preset dispersion rate threshold can be selected to be more than 10%, the specific value of the preset dispersion rate threshold can be set by a person skilled in the art according to actual needs, and the closer the value of the preset dispersion rate threshold is to 10%, the more accurately the problem of parallel mismatch of the inverter can be determined, and the accuracy of the adjustment scheme is improved.
Specifically, the size relationship between the number of MPPT paths corresponding to the inverter to be adjusted and the number of string groups of the inverter to be adjusted is determined, whether the string group access manner of the inverter to be adjusted needs to be adjusted is determined, when it is determined that the string group access manner of the inverter to be adjusted needs to be adjusted, the determined string group access manner of the target inverter can be used as the adjusted string group access manner of the inverter to be adjusted, each MPPT path can be accessed into one string group to be used as the adjusted string group access manner of the inverter to be adjusted, and the adjustment of the string group access manner of the specific inverter is determined according to an actual result.
According to the technical scheme of the embodiment of the invention, the typical day of each inverter is selected, and the current data of each group of the inverters in the typical day is obtained; determining a reference string current curve based on the current data, and determining a string type of the string to be screened according to a current peak value moment corresponding to the reference string current curve and a current peak value moment of the string to be screened; and determining to adjust the group string access mode of the inverter according to the group string access mode of the inverter corresponding to the group string type of the group string to be screened. The problem of can't effectually select the parallel mismatch problem among the prior art and give the solution is solved to realize reducing the parallel mismatch loss of photovoltaic power plant, promote the photovoltaic power plant generated energy.
Example two
Fig. 2 is a flowchart of a method for adjusting a parallel mismatch of photovoltaic power stations according to a second embodiment of the present invention. The present embodiment is optimized based on the above embodiments.
Correspondingly, the method of the embodiment specifically includes:
and S210, selecting dates as typical days when absolute values of second-order differences of the maximum group strings of the daily generated energy of the inverters are smaller than a preset daily generated energy threshold value.
And the analysis object of the parallel mismatch loss is the actual operation data of the photovoltaic power station, so that the inverter which really has problems is screened out. Generally, a date or a time period with relatively stable irradiance needs to be searched as a typical day, if the irradiance is unstable and suddenly high and suddenly low, when the irradiance changes rapidly, the actual tracking response precision of the inverter is different, the obtained output current cannot necessarily reflect the output current under actual irradiation, and the judgment result of parallel mismatch is influenced. Therefore, when data analysis is carried out on the parallel mismatch loss problem, a typical day is selected as much as possible to avoid the interference of meteorological environment factors.
Wherein, the typical day refers to the sampling date of the smooth force curve all day, and the smooth curve indicates that the day is not affected by the cloud layer disturbance.
The typical day is selected according to the fact that absolute values of second-order differences of the maximum group string of daily generated energy of the total station inverter are all smaller than a preset daily generated energy threshold value D, and the specific formula is as follows:
wherein x is t Current data for the t-th sample point, x max The current maximum value of the current day.
Alternatively, from the date of the required adjustment, 2 months ahead, 6 dates satisfying the above conditions can be selected as typical days, and the number of the specifically selected typical days is only an exemplary one and is not limited thereto.
S211, acquiring current data of each group string of each inverter on the typical day, determining the current data of the group string with the maximum power generation amount according to the current data, and obtaining the group string current day dispersion rate of each inverter according to the current data of the group string with the maximum power generation amount.
Specifically, the discrete rate of each point of the group string current taking the inverter as a unit is weighted by the current of the group string with the large generating capacity of the typical total station to obtain the daily discrete rate, and then the currents are sorted from small to large. Optionally, the above operations are performed for the selected 6 typical days.
Since MPPTs under most inverters are connected according to the bus bar branch number, a string current daily dispersion rate calculation formula of a bus bar string current at a certain time (exemplarily, at time j) can be expressed as follows:
CV＝σ/μ
wherein CV is the discrete rate of the current of the combiner box group carried under a certain inverter at the moment j;
sigma is the standard deviation of the current of the combiner box group under the inverter at the moment j;
μ is the average of the bus bar group current carried under the inverter at time j.
Further, because irradiance throughout the day is inconsistent, the weight of the daily dispersion rate of the group current at each time in the day is different, and the dispersion rate at each time needs to be weighted, in this embodiment, the current value corresponding to each time of the group string with the large power generation amount of the typical daily total station is selected as the weight of the dispersion rate at each time, and the dispersion rates at each time are added to obtain the daily dispersion rate of the group current.
S212, determining the reference string current curve based on the string current daily dispersion rate.
And S213, judging that the current peak value moment corresponding to the current curve of the reference string is smaller than the current peak value moment of the string to be screened, if so, executing the step S214, and if not, executing the step S216.
And S214, judging that the current value of each moment before the current peak value moment corresponding to the reference string current curve is larger than the current value of the string to be screened and the moment corresponding to each moment one by one, if so, executing the step S215, and if not, determining that the string type of the string to be screened is a normal string.
Specifically, if the current peak time corresponding to the reference string current curve is less than or equal to the current peak time of the string to be screened, and the current value at each time before the current peak time corresponding to the reference string current curve is less than or equal to the current value at the time corresponding to the string to be screened and each time, the string type of the string to be screened is determined to be a normal string.
S215, judging that the current value of each moment corresponding to the reference string current curve before the current peak moment of the string to be screened is smaller than the current value of the string to be screened and the moment corresponding to each moment in a one-to-one mode, if so, determining that the string type of the string to be screened is a West string, and if not, determining that the string type of the string to be screened is a normal string.
And if the current peak value moment corresponding to the reference string current curve is less than or equal to the current peak value moment of the string to be screened, the current value of each moment before the current peak value moment corresponding to the reference string current curve is greater than the current value of the string to be screened and the moment at which each moment is in one-to-one correspondence, and the current value of each moment before the current peak value moment of the string to be screened and corresponding to the reference string current curve is less than the current value of the string to be screened and the moment at which each moment is in one-to-one correspondence, determining that the string type of the string to be screened is a partial western string.
And if the current peak time corresponding to the current curve of the reference string set is less than or equal to the current peak time of the string set to be screened, the current value of each time before the current peak time corresponding to the current curve of the reference string set is greater than the current value of the string set to be screened and the time at which the string set to be screened corresponds to each time, and the current value of each time before the current peak time of the string set to be screened and the current curve of the reference string set is greater than or equal to the current value of the string set to be screened and the time at which the string set to be screened corresponds to each time, determining that the string type of the string set to be screened is a normal string set.
S216, judging that the current value of each moment before the current peak value moment of the group string to be screened is smaller than the current value of the group string to be screened and the moment corresponding to each moment one by one, if so, executing the step S217, and if not, determining that the group string type of the group string to be screened is a normal group string.
And if the current peak value moment corresponding to the reference string current curve is greater than the current peak value moment of the string to be screened, and the current value of each moment before the current peak value moment of the string to be screened is greater than or equal to the current value of the string to be screened and the moment in one-to-one correspondence with each moment, determining that the string type of the string to be screened is a normal string.
And S217, judging that the current value of each moment before the current peak value moment corresponding to the reference string current curve is larger than the current value of the string to be screened and the moment corresponding to each moment one by one, if so, determining that the string type of the string to be screened is a east-off string, and if not, determining that the string type of the string to be screened is a normal string.
And if the current peak value moment corresponding to the reference string current curve is greater than the current peak value moment of the string to be screened, the current value of each moment before the current peak value moment of the string to be screened is smaller than the current value of the string to be screened and the moment at which the string to be screened corresponds to each moment, and the current value of each moment before the current peak value moment corresponding to the reference string current curve is greater than the current value of the string to be screened and the moment at which the string to be screened corresponds to each moment, determining that the string type of the string to be screened is a partial east string.
And if the current peak value moment corresponding to the reference string current curve is greater than the current peak value moment of the string to be screened, the current value of each moment before the current peak value moment of the string to be screened is smaller than the current value of the string to be screened and the moment at which the string to be screened corresponds to each moment in a one-to-one manner, and the current value of each moment before the current peak value moment corresponding to the reference string current curve is smaller than or equal to the current value of the string to be screened and the moment at which the string to be screened corresponds to each moment in a one-to-one manner, determining that the string type of the string to be screened is a normal string.
S218, determining to adjust the string access mode of the inverter according to the string access mode of the inverter corresponding to the string type of the string to be screened.
According to the technical scheme, the string data under the photovoltaic power station inverter are deeply mined, the photovoltaic strings with inconsistent orientations can be effectively screened out, operation and maintenance personnel of the photovoltaic power station can recombine according to the screened out orientations, an MPTT recombination scheme is provided for the inverter, the parallel mismatch loss of the photovoltaic power station is reduced, and the power generation capacity of the photovoltaic power station is improved.
EXAMPLE III
Fig. 3 is a flowchart of a method for adjusting a parallel mismatch of photovoltaic power stations according to a third embodiment of the present invention. The technical scheme of the embodiment of the invention is further optimized on the basis of the embodiment. The method of the embodiment specifically comprises the following steps:
and S310, selecting dates as typical days when the absolute values of the second-order differences of the maximum group strings of the daily generated energy of the inverters are smaller than a preset daily generated energy threshold value.
S320, acquiring current data of each group string of each inverter on the typical day, determining the current data of the group string with the maximum power generation amount according to the current data, and obtaining the group string current day dispersion rate of each inverter according to the current data of the group string with the maximum power generation amount.
S330, determining the reference string current curve based on the daily discrete rate of the string current, and determining the string type of the string to be screened according to the current peak value time corresponding to the reference string current curve and the current peak value time of the string to be screened.
S340, selecting the inverter with the daily string current dispersion rate larger than a preset dispersion rate threshold value as the inverter to be adjusted, wherein the daily string current dispersion rate of the inverter is determined to correspond to the string type of the string to be screened.
And S350, determining the current string access mode of the inverter to be adjusted according to the number of strings of the inverter to be adjusted, the number of MPPT paths corresponding to the inverter to be adjusted and the number of connectable strings of each MPPT path.
Specifically, the method for determining the current string access mode of the inverter group to be adjusted comprises the following steps: the method comprises the steps of obtaining the number M of current MPPT paths of an inverter and the maximum number L of connectable group strings under each MPPT path, firstly placing one group string on each MPPT path, remaining the number N-M of the group strings, and solving a divisor i and a remainder j of (N-M)/(L-1).
If i is M, then j is 0. The number of the access strings under each path of MPPT is MPPT 1 To MPPT M And the number L of access group strings. If i is equal to M-1, the number of access group strings under each path of MPPT is MPPT 1 To MPPT i Number of access group strings L, MPPT M The number of access group strings j + 1. If i<M-1, the number of access group strings under each path of MPPT is MPPT 1 To MPPT i Number of access group strings L, MPPT i+1 Number j +1, MPPT of access group string i+2 To MPPT M The number of access group strings is 1. Wherein MPPT i Indicating the ith inverter MPPT.
And S360, judging that the number of the MPPT paths corresponding to the inverter to be adjusted is larger than the number of the strings of the inverter to be adjusted, if so, executing a step S370, and if not, executing a step S380.
And S370, judging that the determined group string access mode of the target inverter is different from the current group string access mode of the inverter to be adjusted, if so, determining not to adjust the group string access mode of the inverter to be adjusted, and if not, determining to adjust the group string access mode of the inverter to be adjusted.
Specifically, the method for determining the string access mode of the target inverter comprises the following steps: obtaining the current MPPT path number M of the inverter and the maximum connectable string number L under each MPPT path, obtaining the access string number scheme under each MPPT path, and accessing the string number A under each MPPT path 1 ，A 2 ，A 3 ， 。。。 A M-2 ，A M-1 ，A M Optional A in N string groups 1 A series of groups, a common species
Can make it possible toCalculating the Euclidean distance sum of all-day current curves of every possible two groups of strings, connecting an A1 group corresponding to the minimum value in series with an MPPT, and selecting an A in an N-A1 group string 2 A series of groups, a common species
Possibly, the Euclidean distance sum of all-day current curves of every possible two groups of groups is calculated, an A2 group corresponding to the minimum value is connected in series with one MPPT, the rest AM groups are connected in series with one MPPT and are connected to the last MPPT, and the intersection is calculated for the recombination schemes of the K typical days, namely all the MPPT combination schemes of all the inverters of the K typical days are combined consistently to form the final scheme.
Wherein, the Euclidean distance formula is as follows:
and if the number of the MPPT paths corresponding to the inverter to be adjusted is larger than the number of the strings of the inverter to be adjusted, and the determined access mode of the target inverter string is the same as that of the current inverter string to be adjusted, determining to supplement the string access mode of the inverter to be adjusted.
And if the number of the MPPT paths corresponding to the inverter to be adjusted is larger than the number of the strings of the inverter to be adjusted and the determined access mode of the strings of the target inverter is different from the access mode of the strings of the current inverter to be adjusted, determining to adjust the access mode of the strings of the inverter to be adjusted, namely adjusting the access mode of the strings of the inverter to be adjusted to the access mode of the strings of the target inverter.
And S380, judging that the number of the connectable strings under each path of MPPT is one, if so, determining not to adjust the string access mode of the inverter to be adjusted, and if not, determining to adjust the string access mode of the inverter to be adjusted.
And if the number of the MPPT paths corresponding to the inverter to be adjusted is less than or equal to the number of the strings of the inverter to be adjusted, and the number of the connectable strings of each MPPT path is one, determining not to adjust the string access mode of the inverter to be adjusted.
And if the number of the MPPT paths corresponding to the inverter to be adjusted is less than or equal to the number of the strings of the inverter to be adjusted, and the number of the connectable strings of the inverter to be adjusted is not one for each path of MPPT, determining to adjust the string access mode of the inverter to be adjusted, namely adjusting the string access mode of the inverter to be adjusted to access one photovoltaic string of the inverter to be adjusted under each path of MPPT.
According to the technical scheme of the embodiment of the invention, smoothness of the group string with the highest daily generated energy of the total station is taken as a standard for judging a typical day, the discrete rates of a plurality of typical days are used for processing, and the current data of the group string under the inverter is obtained to determine the daily discrete rate of the group string current and judge whether the inverter has the problem of parallel mismatch. The MPPT wiring scheme of the inverter with the daily discrete rate of the string current higher than the threshold value is adjusted, and the power generation capacity of the photovoltaic power station is improved. Meanwhile, on the premise of not adding extra hardware equipment, the daily dispersion rate and Euclidean distance of the string current are calculated by using a plurality of typical daily all-day string current curves, so that the influence of a single point on a final result can be effectively reduced, and the reliability of adjusting a string access scheme is improved.
Example four
Fig. 4 is a flowchart of a method for adjusting a parallel mismatch of photovoltaic power stations according to a fourth embodiment of the present invention. The technical scheme of the embodiment of the invention is further optimized on the basis of the embodiment. The method of the embodiment specifically includes:
and selecting dates on which the absolute values of the second-order differences of the maximum group strings of the daily generated energy of each inverter are smaller than a preset daily generated energy threshold value as typical days.
And acquiring current data of each group string of each inverter on the typical day, determining the current data of the group string with the maximum power generation amount according to the current data, and obtaining the group string current day dispersion rate of each inverter according to the current data of the group string with the maximum power generation amount.
And determining the reference string current curve based on the daily discrete rate of the string current, and determining the string type of the string to be screened according to the current peak value time corresponding to the reference string current curve and the current peak value time of the string to be screened.
Selecting an inverter, which determines that the daily string current dispersion rate of the inverter corresponding to the string type of the string to be screened is greater than a preset dispersion rate threshold value, as an inverter to be adjusted;
and determining the access mode of the current inverter to be adjusted according to the number of the strings of the inverter to be adjusted, the number of MPPT paths corresponding to the inverter to be adjusted and the number of the connectable strings of each MPPT path.
And determining to adjust the string access mode of the inverter according to the string access mode of the inverter corresponding to the string type of the string to be screened.
EXAMPLE five
Fig. 5 is a structural diagram of an adjusting apparatus for photovoltaic power station parallel mismatch according to a fifth embodiment of the present invention, where the fifth embodiment is applicable to a situation where photovoltaic power station inverter parallel mismatch is detected and adjusted.
As shown in fig. 5, the adjusting apparatus includes: a current data obtaining module 510, a string type determining module 520, and a string accessing manner determining module 530, wherein:
a current data obtaining module 510, configured to select a typical day of each inverter, and obtain current data of each group of strings of each inverter on the typical day;
a string type determining module 520, configured to determine a reference string current curve based on the current data, and determine a string type of the string to be screened according to a current peak time corresponding to the reference string current curve and a current peak time of the string to be screened;
a string access manner determining module 530, configured to determine, according to the string access manner of the inverter corresponding to the string type of the string to be filtered, to adjust the string access manner of the inverter.
The photovoltaic power station parallel mismatch adjusting device selects a typical day of each inverter and obtains current data of each group string of each inverter on the typical day; determining a reference string current curve based on the current data, and determining the string type of the string to be screened according to the current peak value moment corresponding to the reference string current curve and the current peak value moment of the string to be screened; and determining to adjust the string access mode of the inverter according to the string access mode of the inverter corresponding to the string type of the string to be screened. The problem of can't effectually select the parallel mismatch problem among the prior art and give the solution is solved to realize reducing the parallel mismatch loss of photovoltaic power plant, promote the photovoltaic power plant generated energy.
On the basis of the above embodiments, the selecting a typical day of each inverter includes:
and selecting dates as typical days when the absolute values of the second-order differences of the maximum group strings of the daily generated energy of the inverters are smaller than a preset daily generated energy threshold value.
On the basis of the above embodiments, determining a reference string current curve based on the current data further includes:
determining current data of the group string with the maximum power generation amount according to the current data, and obtaining the group string current daily discrete rate of each inverter according to the current data of the group string with the maximum power generation amount;
determining the reference string current profile based on the string current daily dispersion rate.
On the basis of the above embodiments, determining the string type of the string to be screened according to the current peak time corresponding to the reference string current curve and the current peak time of the string to be screened includes:
if the current peak time corresponding to the reference string current curve is before the current peak time of the string to be screened, and the current value of each time before the current peak time corresponding to the reference string current curve is less than or equal to the current value of the time at which the string to be screened and each time are in one-to-one correspondence, determining that the string type of the string to be screened is a normal string; or the like, or a combination thereof,
and if the current peak moment corresponding to the current curve of the reference string group is before the current peak moment of the string group to be screened, the current value of each moment before the current peak moment corresponding to the current curve of the reference string group is larger than the current value of the string group to be screened and the moment at which each moment is in one-to-one correspondence, and the current value of each moment before the current peak moment of the string group to be screened and the current curve of the reference string group is larger than or equal to the current value of the string group to be screened and the moment at which each moment is in one-to-one correspondence, determining that the string group type of the string group to be screened is a normal string group.
On the basis of the above embodiments, determining the string type of the string to be screened according to the current peak time corresponding to the reference string current curve and the current peak time of the string to be screened includes:
and if the current peak time corresponding to the current curve of the reference group string is before the current peak time of the group string to be screened, the current value of each time before the current peak time corresponding to the current curve of the reference group string is larger than the current value of the group string to be screened and the time at which each time is in one-to-one correspondence, and the current value of each time before the current peak time of the group string to be screened and the current curve of the reference group string is smaller than the current value of the group string to be screened and the time at which each time is in one-to-one correspondence, determining that the group string type of the group string to be screened is a partial western group string.
On the basis of the foregoing embodiments, determining a string type of the string to be screened according to a current peak time corresponding to the reference string current curve and a current peak time of the string to be screened, includes:
if the current peak time corresponding to the reference string current curve is behind the current peak time of the string to be screened and the current value of each time before the current peak time of the string to be screened is greater than or equal to the current value of the time at which the string to be screened and each time are in one-to-one correspondence, determining that the string type of the string to be screened is a normal string; or the like, or a combination thereof,
and if the current peak time corresponding to the current curve of the reference string group is after the current peak time of the string group to be screened, and the current value of each time before the current peak time of the string group to be screened is smaller than the current value of the time of the string group to be screened, which corresponds to each time one by one, and the current value of each time before the current peak time corresponding to the current curve of the reference string group is smaller than or equal to the current value of the time of the string group to be screened, which corresponds to each time one by one, determining that the string group type of the string group to be screened is a normal string group.
On the basis of the foregoing embodiments, determining a string type of the string to be screened according to a current peak time corresponding to the reference string current curve and a current peak time of the string to be screened, includes:
and if the current peak time corresponding to the current curve of the reference string group is behind the current peak time of the string group to be screened, the current value of each time before the current peak time of the string group to be screened is smaller than the current value of the time when the string group to be screened and the time are in one-to-one correspondence, and the current value of each time before the current peak time corresponding to the current curve of the reference string group is larger than the current value of the time when the string group to be screened and the time are in one-to-one correspondence, determining that the string group type of the string group to be screened is a east group string.
On the basis of the foregoing embodiments, before determining to adjust the string access manner of the inverter according to the string access manner of the inverter corresponding to the string type of the string to be screened, the method further includes:
selecting an inverter, which determines that the daily string current dispersion rate of the inverter corresponding to the string type of the string to be screened is greater than a preset dispersion rate threshold value, as an inverter to be adjusted;
and determining the current string access mode of the inverter to be adjusted according to the number of strings of the inverter to be adjusted, the number of MPPT paths corresponding to the inverter to be adjusted and the number of connectable strings of each MPPT path.
On the basis of the above embodiments, determining to adjust the string access manner of the inverter according to the string access manner of the inverter corresponding to the string type of the string to be screened includes:
and if the number of the MPPT paths corresponding to the inverter to be adjusted is larger than the number of the strings of the inverter to be adjusted, and the determined access mode of the target inverter strings is different from the access mode of the current inverter strings to be adjusted, determining to adjust the access mode of the strings of the inverter to be adjusted.
On the basis of the above embodiments, determining to adjust the string group access manner of the inverter according to the string group access manner of the inverter corresponding to the string group type of the string group to be screened includes:
and if the number of the MPPT paths corresponding to the inverter to be adjusted is less than or equal to the number of the strings of the inverter to be adjusted, and the number of the connectable strings of each MPPT path is not one, determining to adjust the string access mode of the inverter to be adjusted.
The adjusting device for the photovoltaic power station parallel mismatch provided by each embodiment can execute the adjusting method for the photovoltaic power station parallel mismatch provided by any embodiment of the invention, and has corresponding functional modules and beneficial effects for executing the adjusting method for the photovoltaic power station parallel mismatch.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (11)
1. A method for adjusting photovoltaic power station parallel mismatch is characterized by comprising the following steps:
selecting a typical day of each inverter, and acquiring current data of each group of strings of each inverter on the typical day;
determining a reference string current curve based on the current data, comparing a current value at each moment before a current peak moment corresponding to the reference string current curve with a current value at a moment corresponding to the string to be screened one by one based on the current peak moment corresponding to the reference string current curve before or after the current peak moment of the string to be screened, and comparing the current value at each moment corresponding to the reference string current curve before the current peak moment of the string to be screened with the current value at the moment corresponding to the string to be screened one by one to determine the string type of the string to be screened;
and determining to adjust the string access mode of the inverter according to the string access mode of the inverter corresponding to the string type of the string to be screened, wherein the string access mode is determined by the number of the next strings of the inverter, the MPPT (maximum power point tracking) paths of the inverter and the maximum connectable string number under each MPPT.
2. The method of claim 1, wherein selecting a typical day for each inverter comprises:
and selecting dates as typical days when the absolute values of the second-order differences of the maximum group strings of the daily generated energy of the inverters are smaller than a preset daily generated energy threshold value.
3. The method of adjusting of claim 1, wherein determining a reference string current profile based on the current data further comprises:
determining current data of the group string with the maximum power generation amount according to the current data, and obtaining the group string current daily discrete rate of each inverter according to the current data of the group string with the maximum power generation amount;
determining the reference string current profile based on the string current daily dispersion rate.
4. The adjusting method according to claim 1, wherein determining the string type of the string to be screened according to a current peak time corresponding to the reference string current curve and a current peak time of the string to be screened includes:
if the current peak value moment corresponding to the reference string current curve is before the current peak value moment of the string to be screened, and the current value at each moment before the current peak value moment corresponding to the reference string current curve is less than or equal to the current value at the moment when the string to be screened corresponds to each moment in a one-to-one manner, determining that the string type of the string to be screened is a normal string; or the like, or, alternatively,
and if the current peak moment corresponding to the current curve of the reference string group is before the current peak moment of the string group to be screened, the current value of each moment before the current peak moment corresponding to the current curve of the reference string group is larger than the current value of the string group to be screened and the moment at which each moment is in one-to-one correspondence, and the current value of each moment before the current peak moment of the string group to be screened and the current curve of the reference string group is larger than or equal to the current value of the string group to be screened and the moment at which each moment is in one-to-one correspondence, determining that the string group type of the string group to be screened is a normal string group.
5. The adjusting method according to claim 1, wherein determining the string type of the string to be screened according to the current peak time corresponding to the reference string current curve and the current peak time of the string to be screened comprises:
and if the current peak time corresponding to the current curve of the reference group string is before the current peak time of the group string to be screened, the current value of each time before the current peak time corresponding to the current curve of the reference group string is larger than the current value of the group string to be screened and the time at which each time is in one-to-one correspondence, and the current value of each time before the current peak time of the group string to be screened and the current curve of the reference group string is smaller than the current value of the group string to be screened and the time at which each time is in one-to-one correspondence, determining that the group string type of the group string to be screened is a partial western group string.
6. The adjusting method according to claim 1, wherein determining the string type of the string to be screened according to the current peak time corresponding to the reference string current curve and the current peak time of the string to be screened comprises:
if the current peak time corresponding to the reference string current curve is behind the current peak time of the string to be screened and the current value of each time before the current peak time of the string to be screened is greater than or equal to the current value of the time at which the string to be screened and each time are in one-to-one correspondence, determining that the string type of the string to be screened is a normal string; or the like, or, alternatively,
and if the current peak time corresponding to the reference string current curve is behind the current peak time of the string to be screened, the current value of each time before the current peak time of the string to be screened is smaller than the current value of the string to be screened and the time at which each time is in one-to-one correspondence, and the current value of each time before the current peak time corresponding to the reference string current curve is smaller than or equal to the current value of the string to be screened and the time at which each time is in one-to-one correspondence, determining that the string type of the string to be screened is a normal string.
7. The adjusting method according to claim 1, wherein determining the string type of the string to be screened according to the current peak time corresponding to the reference string current curve and the current peak time of the string to be screened comprises:
and if the current peak time corresponding to the current curve of the reference string is after the current peak time of the string to be screened, and the current value of each time before the current peak time of the string to be screened is smaller than the current value of the string to be screened and the time at which each time is in one-to-one correspondence, and the current value of each time before the current peak time corresponding to the current curve of the reference string is larger than the current value of the string to be screened and the time at which each time is in one-to-one correspondence, determining that the string type of the string to be screened is the east-west string.
8. The adjusting method according to claim 3, wherein before determining to adjust the string access manner of the inverter according to the string access manner of the inverter corresponding to the string type of the string to be screened, the adjusting method further comprises:
selecting an inverter, which determines that the daily string current dispersion rate of the inverter corresponding to the string type of the string to be screened is greater than a preset dispersion rate threshold value, as an inverter to be adjusted;
and determining the current string access mode of the inverter to be adjusted according to the number of strings of the inverter to be adjusted, the number of MPPT paths corresponding to the inverter to be adjusted and the number of connectable strings of each MPPT path.
9. The adjusting method according to claim 8, wherein determining to adjust the string access manner of the inverter according to the string access manner of the inverter corresponding to the string type of the string to be screened includes:
and if the number of the MPPT paths corresponding to the inverter to be adjusted is larger than the number of the strings of the inverter to be adjusted, and the determined access mode of the target inverter strings is different from the access mode of the current inverter strings to be adjusted, determining to adjust the access mode of the strings of the inverter to be adjusted.
10. The adjusting method according to claim 8, wherein determining to adjust the string access manner of the inverter according to the string access manner of the inverter corresponding to the string type of the string to be screened includes:
and if the number of the MPPT paths corresponding to the inverter to be adjusted is less than or equal to the number of the strings of the inverter to be adjusted, and the number of the connectable strings of each MPPT path is not one, determining to adjust the string access mode of the inverter to be adjusted.
11. An adjustment device for photovoltaic power station parallel mismatch, comprising:
the current data acquisition module is used for selecting a typical day of each inverter and acquiring current data of each group of strings of each inverter on the typical day;
a string type determining module, configured to determine a reference string current curve based on the current data, compare a current value at each time before a current peak time corresponding to the reference string current curve with a current value at a time corresponding to the string to be screened and the time corresponding to each time one by one based on whether a current peak time corresponding to the reference string current curve is before or after the current peak time of the string to be screened, and compare a current value at each time before the current peak time of the string to be screened and a current value at a time corresponding to the string to be screened and the time corresponding to each time one by one based on the reference string current curve, and determine a string type of the string to be screened;
and the string access mode determining module is used for determining and adjusting the string access mode of the inverter according to the string access mode of the inverter corresponding to the string type of the string to be screened, wherein the string access mode is determined by the number of the next strings of the inverter, the number of MPPT (maximum power point tracking) paths of the inverter and the maximum number of connectable strings under each MPPT path.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010088159.9A CN111193289B (en) | 2020-02-12 | 2020-02-12 | Photovoltaic power station parallel mismatch adjusting method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010088159.9A CN111193289B (en) | 2020-02-12 | 2020-02-12 | Photovoltaic power station parallel mismatch adjusting method and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111193289A CN111193289A (en) | 2020-05-22 |
| CN111193289B true CN111193289B (en) | 2022-09-13 |
Family
ID=70710788
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010088159.9A Active CN111193289B (en) | 2020-02-12 | 2020-02-12 | Photovoltaic power station parallel mismatch adjusting method and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111193289B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112329996B (en) * | 2020-10-26 | 2023-12-22 | 阳光智维科技股份有限公司 | Inverter mismatch optimization method, device and equipment |
| CN113517718B (en) * | 2021-08-13 | 2024-06-25 | 阳光电源股份有限公司 | Photovoltaic group series-parallel mismatch optimization method, power equipment and photovoltaic system |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010267106A (en) * | 2009-05-15 | 2010-11-25 | Ntt Facilities Inc | Photovoltaic power generation system and control method |
| CN105305960A (en) * | 2015-12-02 | 2016-02-03 | 蚌埠电子信息产业技术研究院 | Photovoltaic system series-parallel mismatch loss ratio test device and test method thereof |
| CN106998190A (en) * | 2017-04-20 | 2017-08-01 | 华电电力科学研究院 | A kind of photovoltaic arrays connection in series-parallel mismatch loss analysis method |
| CN107508543A (en) * | 2017-07-24 | 2017-12-22 | 北方工业大学 | The normal structure and its power optimization method of characteristic mismatch photovoltaic group string |
| CN107689772A (en) * | 2017-09-01 | 2018-02-13 | 中国华电科工集团有限公司 | The evaluation method of the submatrix parallel connection mismatch of photovoltaic plant |
| CN108509737A (en) * | 2018-04-09 | 2018-09-07 | 中国计量大学 | The parameter extracting method of each mismatch component in a kind of photovoltaic string formation |
| CN109038574A (en) * | 2018-09-03 | 2018-12-18 | 苏州协鑫新能源运营科技有限公司 | A kind of calculation method of the series-parallel mismatch loss of the group of photovoltaic plant |
-
2020
- 2020-02-12 CN CN202010088159.9A patent/CN111193289B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010267106A (en) * | 2009-05-15 | 2010-11-25 | Ntt Facilities Inc | Photovoltaic power generation system and control method |
| CN105305960A (en) * | 2015-12-02 | 2016-02-03 | 蚌埠电子信息产业技术研究院 | Photovoltaic system series-parallel mismatch loss ratio test device and test method thereof |
| CN106998190A (en) * | 2017-04-20 | 2017-08-01 | 华电电力科学研究院 | A kind of photovoltaic arrays connection in series-parallel mismatch loss analysis method |
| CN107508543A (en) * | 2017-07-24 | 2017-12-22 | 北方工业大学 | The normal structure and its power optimization method of characteristic mismatch photovoltaic group string |
| CN107689772A (en) * | 2017-09-01 | 2018-02-13 | 中国华电科工集团有限公司 | The evaluation method of the submatrix parallel connection mismatch of photovoltaic plant |
| CN108509737A (en) * | 2018-04-09 | 2018-09-07 | 中国计量大学 | The parameter extracting method of each mismatch component in a kind of photovoltaic string formation |
| CN109038574A (en) * | 2018-09-03 | 2018-12-18 | 苏州协鑫新能源运营科技有限公司 | A kind of calculation method of the series-parallel mismatch loss of the group of photovoltaic plant |
Non-Patent Citations (2)
| Title |
|---|
| 基于光伏组串I-V特性的并联失配检测;刘庆超等;《发电与空调》;20160215(第01期);30-33 * |
| 并网光伏电站基于汇流箱组串电流离散率的分析方法及应用;傅国轩等;《电网与清洁能源》;20141125(第11期);114-118 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111193289A (en) | 2020-05-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| AU2019216664B2 (en) | Method for photovoltaic module fault diagnosis, edge calculation processing device, and inverter | |
| CN109873610B (en) | Photovoltaic array fault diagnosis method based on IV characteristic and depth residual error network | |
| Gopiya-Naik et al. | Optimal allocation of distributed generation in distribution system for loss reduction | |
| US20110184583A1 (en) | Model-based power estimation of photovoltaic power generation system | |
| CN111193289B (en) | Photovoltaic power station parallel mismatch adjusting method and device | |
| CN111245365B (en) | Photovoltaic module fault diagnosis method based on dynamic weighted depth forest | |
| Ghaedi et al. | Incorporating Large Photovoltaic Farms in Power Generation System Adequacy Assessment | |
| CN111181196A (en) | Photovoltaic power station configuration method and device | |
| Huang et al. | Parameter identification for photovoltaic models using an improved learning search algorithm | |
| CN106998190B (en) | Photovoltaic array series-parallel mismatch loss analysis method | |
| Senthilkumar et al. | Brief review on solar photovoltaic parameter estimation of single and double diode model using evolutionary algorithms | |
| CN114520630A (en) | Photovoltaic string multimodal detection method based on I-V curve | |
| Perera et al. | Power generation and performance analysis of Bi-facial vs Mono-facial 10KW Photovoltaic power station | |
| CN111509782A (en) | Probabilistic power flow analysis method considering charging load and photovoltaic output random characteristics | |
| CN107271916B (en) | Battery plate group string health state detection method | |
| Ye et al. | Research on PV array output characteristics based on shadow image recognition | |
| CN113708380A (en) | Regional reactive power reserve multi-objective optimization method for wind-light-reserve hybrid system | |
| CN114967823A (en) | Photovoltaic maximum power point tracking control method and device based on improved black widow | |
| CN111711417B (en) | Method for diagnosing abnormal power generation amount in photovoltaic system | |
| CN110598956B (en) | Method and device for predicting power generation power of photovoltaic power station | |
| Zhang et al. | A situation awareness and early warning method for voltage instability risk | |
| CN114123970B (en) | Method, device, equipment and computer storage medium for detecting power generation loss | |
| CN117254586B (en) | Distributed energy grid-connected monitoring regulation and control system | |
| Zhang et al. | A Hybrid Knowledge-Based and Data-Driven Method for Photovoltaic System Fault Diagnosis | |
| CN113126660B (en) | Photovoltaic module tracking control method and related device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: High tech Zone of Hefei city of Anhui Province in 230088 Lake Road No. 2 Applicant after: Sunshine New Energy Development Co.,Ltd. Address before: High tech Zone of Hefei city of Anhui Province in 230088 Lake Road No. 2 Applicant before: Sunshine New Energy Development Co.,Ltd. Address after: High tech Zone of Hefei city of Anhui Province in 230088 Lake Road No. 2 Applicant after: Sunshine New Energy Development Co.,Ltd. Address before: 230088 6th floor, R & D center building, no.1699 Xiyou Road, high tech Zone, Hefei City, Anhui Province Applicant before: HEFEI SUNGROW RENEWABLE ENERGY SCI. & TECH. Co.,Ltd. |
|
| CB02 | Change of applicant information | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |