CN111193289A - Photovoltaic power station parallel mismatch adjusting method and device - Google Patents
Photovoltaic power station parallel mismatch adjusting method and device Download PDFInfo
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Abstract
The embodiment of the invention discloses a method and a device for adjusting the parallel mismatch of photovoltaic power stations. 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 rate, 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 strings have different output characteristics due to different environment and self parameters, and when the access string is larger than 1 under the same MPPT of the inverter, the problem of parallel mismatch is inevitable. When the orientations are different, or a shielded or unshielded string is connected to the same MPPT (the current MPPT of the same string inverter is mostly connected to 2 strings or 3 strings), the problem of parallel mismatch is particularly serious, and 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 locally optimal and the combination scheme is adjusted ceaselessly can be avoided.
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 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.
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 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 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 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.
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, 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 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 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.
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 photovoltaic power stations according to a third embodiment of the present invention;
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;
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, 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 may 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 string with the largest daily generated energy of a total station inverter of the photovoltaic power station, and determining the typical day by 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 obtaining 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 the time period of 8:00 to 17:30 in the time of day, and the current data of 40 points in total is selected, in addition, the granularity of the current data can also be selected, exemplarily, 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 below 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 typical daily total station.
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 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.
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:
s210, selecting dates as typical days when absolute values of second-order differences of the maximum group strings of daily generated energy of the inverters are smaller than a preset daily generated energy threshold value.
The analysis object of the parallel mismatch loss is 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 istCurrent data for the t-th sample point, xmaxThe 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 with 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 daily discrete rates 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 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 the current curve of the reference string is greater than or equal to 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 normal string.
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 different orientations can be effectively screened out, operation and maintenance personnel of the photovoltaic power station can recombine according to the screened 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 includes:
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 dispersion rate of the string current, 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.
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: obtaining the number M of current MPPT paths of the inverter and the maximum number L of connectable strings under each path of MPPT, firstly placing a string group on each path of MPPT, leaving the number N-M of the string groups, and solving the divisor i and the remainder j of (N-M)/(L-1).
If i is equal to M, j is equal to 0. The number of access strings under each path of MPPT is MPPT1To MPPTMAnd 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 MPPT1To MPPTiNumber of access group strings L, MPPTMThe number of access group strings j + 1. If i<M-1, the number of access group strings under each path of MPPT is MPPT1To MPPTiNumber of access group strings L, MPPTi+1Number j +1, MPPT of access group stringi+2To MPPTMThe number of access group strings is 1. Wherein MPPTiIndicating the i-th MPPT of the inverter.
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 group string number L under each path of MPPT, obtaining the access group string number scheme under each path of MPPT, and the access group string number A of each path of MPPT1，A2，A3，。。。AM-2，AM-1，AMOptional A in N string groups1A series of groups, a common speciesPossibly, the Euclidean distance sum of all-day current curves of every possible two groups of strings is calculated, the A1 group corresponding to the minimum value is taken to be connected in series with one MPPT, and the A is selected from the N-A1 group strings2A 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 intersection is calculated for recombination schemes of K typical days, namely all MPPT combination schemes of all the inverter paths of the K typical days are combined consistently to form a 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 string with the highest daily generated energy of the total station is taken as a standard for judging the typical day, the discrete rates of a plurality of typical days are used for processing, and the current data of the string under the inverter is obtained to determine the daily discrete rate of the current of the string to 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 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.
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 dispersion rate of the string current, 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.
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 present embodiment is applicable to a situation where photovoltaic power station inverter parallel mismatch is detected and adjusted.
As shown in fig. 5, the adjusting device 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 string 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 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 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 foregoing embodiments, determining a string type of a 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 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.
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 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, 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.
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 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.
The photovoltaic power station parallel mismatch adjusting device provided by each embodiment can execute the photovoltaic power station parallel mismatch adjusting method provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the photovoltaic power station parallel mismatch adjusting method.
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, 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.
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 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 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.
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 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.
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;
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.
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