CN117713685A - Method for identifying relation between tracking bracket and string and inverter - Google Patents
Method for identifying relation between tracking bracket and string and inverter Download PDFInfo
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Abstract
The invention discloses a method for identifying the relationship between a tracking bracket and a string and an inverter. Meanwhile, the measures of adjusting the power (current) ratio threshold value, carrying out a twice rotation identification confirmation process of firstly suspected and then confirmed, comparing the power (current) ratio threshold value with the conventional number of the tracking support bearing strings, calculating the completion rate of the tracking support string identification and periodically running the tracking support string identification task are adopted to ensure the accuracy rate of the tracking support and string relation identification and improve the identification efficiency, the manpower, material resources and time consumed by a manual field mark re-entry system and manual check and adjustment are saved, the relation between the photovoltaic tracking support and the photovoltaic string and the photovoltaic inverter is automatically established, and more refined operation and maintenance work is facilitated for operation and maintenance personnel.
Description
Technical Field
The invention relates to the field of photovoltaic equipment management, in particular to a method for identifying the relation between a tracking bracket and a string and an inverter.
Background
The photovoltaic monitoring system is a system for assisting operation and maintenance personnel to complete operation and maintenance work of the power station by monitoring real-time operation conditions of all photovoltaic inverters and photovoltaic strings in the power station.
The photovoltaic tracking system is a system for controlling and adjusting tracking angles of all tracking brackets in a photovoltaic power station according to solar irradiation amount, longitude and latitude of a geographic position where a photovoltaic module is located and other data.
In large ground-based photovoltaic power plants using tracking brackets, the two systems described above are typically present simultaneously, and each of the two systems is deployed and operated independently. The two sets of systems can be interconnected and communicated through a specific protocol, so that the purpose that operation and maintenance personnel can control and adjust the tracking bracket in the photovoltaic monitoring system is achieved. In some power stations, because of the independent characteristics of the two sets of systems, there is no association between the tracking brackets in the two sets of systems and the strings and the inverter, so that an operation and maintenance person cannot know which tracking bracket is used for carrying a certain string in the actual operation and maintenance process, and further cannot know which tracking brackets are used for carrying which strings under a certain inverter. The existence of the unknown relation problem causes that operation and maintenance personnel cannot realize operation and maintenance actions of adjusting a specific tracking angle of a certain tracking bracket according to an inverter or a group string through a photovoltaic monitoring system.
In a large-scale ground-type photovoltaic power station, there are often tens or even hundreds of photovoltaic inverters, thousands or even tens of thousands of strings and tracking supports, the floor space is very wide, the distance between the strings and the tracking supports is relatively far, and if the precise relation between the strings and the tracking supports is established and confirmed by adopting a manual marking and checking mode, relatively large manpower and material resources are required to be consumed. Even if the relation between the tracking brackets and the strings and the inverters are planned in advance in the power station design stage, a certain time and labor are consumed in the power station debugging stage, the relation configuration among all the tracking brackets, the strings and the inverters is completed in the photovoltaic monitoring system according to the power station design, and meanwhile, the relation is checked with the actual equipment which is completed in construction, so that the operation and maintenance work of the photovoltaic power station can be more conveniently carried out.
Disclosure of Invention
Aiming at the defects in the prior art, the method for identifying the relation between the tracking bracket and the group string and the inverter solves the problem that the tracking angle of a specific photovoltaic tracking bracket cannot be adjusted according to the inverter or the group string.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
there is provided a method of identifying tracking brackets in relation to strings and inverters comprising the steps of:
s1, setting the conventional number of the tracking bracket bearing strings, and configuring the relation between the existing tracking bracket communication control box and the data acquisition equipment;
s2, marking a data acquisition equipment list with the identification rate of the serial relation of the tracking bracket group in the system being less than 100% as a data acquisition list to be processed;
s3, judging whether untreated data acquisition equipment exists in the data acquisition list to be treated, and if so, entering a step S4; otherwise, judging that the tracking bracket and the group string which need to be identified do not exist;
s4, taking the untreated data acquisition equipment as the data acquisition equipment to be treated, removing the group strings which cannot normally generate electricity under the untreated data acquisition equipment, and acquiring all tracking brackets which are associated with the data acquisition equipment and are not marked as the identified tracking brackets under the communication control box of all tracking brackets to form a tracking bracket list to be identified;
s5, judging whether the tracking bracket to be identified exists in the tracking bracket list to be identified, and if so, entering a step S6; otherwise, returning to the step S3;
s6, acquiring power values of all groups of strings which are empty and not unrecognizable in the tracking brackets under the current data acquisition equipment to be processed, and marking the power values as the power before recognition of each group of strings;
s7, acquiring a tracking bracket to be identified which is not analyzed, rotating the tracking bracket according to a set amplitude, acquiring power values which are empty and not unidentifiable in the current data acquisition equipment to be processed after a first set time, and marking the power values as power after identification of each group of strings;
s8, calculating the ratio of the power after the identification to the power before the identification of each group of strings, marking the group strings with the ratio less than or equal to a first power ratio threshold as suspected group strings, and filling the tracking bracket to which the suspected group strings belong as the serial number of the tracking bracket to be identified at this time;
s9, recovering the tracking bracket to be identified which rotates according to the set amplitude to the normal position, and acquiring the power marked as the suspected string after the second set time as the power after string recovery;
s10, calculating the ratio of the power after the identification of the suspected strings to the power after the recovery, and clearing the suspected marks of the strings with the ratio larger than a second power ratio threshold and the serial numbers of the tracking brackets to obtain the number of the residual suspected strings;
s11, comparing the number of the residual suspected group strings with the conventional number of the tracking bracket bearing group strings, and if the comparison result is larger than the conventional number, entering a step S12; if the comparison result is equal, the step S13 is entered; if the comparison result is smaller than the preset value, the step S14 is carried out;
s12, filling the tracking bracket numbers of the residual suspected group strings into the suspected tracking bracket, removing the suspected mark of the group strings and the filled tracking bracket numbers, taking the group strings as the group strings to be further confirmed, and returning to the step S5;
s13, marking the tracking bracket to be identified as identified, indicating that the relationship between the tracking bracket and the group string is identified, and entering step S14;
s14, clearing suspected marks of each suspected string, reserving the serial numbers of the tracking brackets of each suspected string, establishing the relation between the inverter and the current identified tracking bracket according to the inverter accessed by each suspected string, updating the identification rate of the tracking bracket string relation of the current data acquisition equipment, and returning to the step S5.
Further, the specific method in step S1 is as follows:
setting the conventional number of the tracking brackets for bearing the group strings in the photovoltaic monitoring system according to the design planning of the power station and the actual installation condition of the tracking brackets and the group strings;
acquiring a tracking bracket communication control box, a tracking bracket and information of the relation between the tracking bracket communication control box and the tracking bracket from a photovoltaic tracking system through a third party interface, and configuring the relation between the tracking bracket communication control box and data acquisition equipment in a photovoltaic monitoring system; when the complete association relation between the tracking bracket control box and the data acquisition equipment cannot be acquired, the relation between the data acquisition equipment and the tracking bracket communication control box is not configured.
Further, in step S2:
if the data acquisition equipment is configured with the relation with the tracking bracket communication control box, the identification rate of the tracking bracket group string relation of the corresponding data acquisition equipment=the tracking bracket number belonged to under the data acquisition equipment is not empty and is not the number of group strings of the unrecognizable group string number ≡the number of all group strings under the data acquisition equipment × 100%; step S3 is entered;
if the relationship between the data acquisition equipment and the tracking bracket communication control box is not configured, all tracking brackets which are not marked as recognized are directly acquired to form a tracking bracket list to be recognized, and the recognition rate of the tracking bracket group string relationship of the corresponding data acquisition equipment = the number of the group strings which are not empty and are not the number of the unrecognizable group strings in the system ≡the number of the group strings of the total group strings in the system × 100%.
Further, the identification method of the group string which cannot normally generate electricity under the untreated data acquisition equipment comprises the following steps:
and marking the group strings which are empty and have the 'generating power of 0 or the state of failure' of the tracking support under the untreated data acquisition equipment as the group strings which cannot be identified, namely marking the group strings as the group strings which cannot normally generate electricity.
Further, in step S6, if the relationship between the tracking bracket control box and the data acquisition device is not configured, the power values of all the group strings with empty tracking brackets in the system are recorded as the power before identifying each group string.
Further, the string current value is adopted as the string power value.
Further, in step S7, if the relationship between the tracking bracket control box and the data acquisition device is not configured, after the first set time, power values of all the group strings with empty tracking brackets in the system are acquired and recorded as the power after the identification of each group string.
Further, the first set time and the second set time are the same and are both 5 seconds.
Further, the first power ratio threshold and the second power ratio threshold are the same, and are both 0.2.
Further, for the group string to be further confirmed, the following operations are performed:
a1, screening out the group strings marked as the group strings to be further confirmed that the serial numbers of the affiliated tracking stents are not null and the group strings which are different from the serial numbers of the suspected tracking stents form a confirmed attribution group serial table
A2, for the group strings in the confirmed attribution group string list, adding the suspected tracking stent numbers of the group strings into the tracking stent list to be further confirmed one by one, and clearing the mark to be further confirmed and the suspected tracking stent numbers of the group strings;
a3, judging whether the tracking bracket to be confirmed which is not analyzed exists in the tracking bracket list to be further confirmed, if so, entering a step A4; otherwise, finishing the identification of the group string to be further confirmed;
a4, acquiring a tracking bracket to be confirmed, and acquiring all groups of strings with suspected tracking bracket numbers being the tracking bracket numbers;
a5, judging whether the number of the strings obtained in the step A4 is not equal to the conventional number of the tracking bracket bearing strings set by the system, if so, entering the step A6; otherwise, enter step A7;
a6, taking the confirmed tracking bracket as a legacy tracking bracket, and identifying after the next tracking bracket group string identification task is finished;
a7, modifying the acquired serial numbers of the tracking brackets of the groups of strings into suspected tracking bracket numbers, clearing the marks to be further confirmed and the suspected tracking bracket numbers, marking the confirmed tracking bracket this time as an identified tracking bracket, updating the identification rate of the tracking bracket groups of the data acquisition equipment to which the tracking bracket belongs, and returning to the step A3.
The beneficial effects of the invention are as follows: the invention utilizes the characteristic that the large-amplitude rotation of the photovoltaic tracking bracket can cause the larger change of the generating efficiency of the string, and automatically completes the relationship identification between the tracking bracket and the string. Meanwhile, the measures of adjusting the power (current) ratio threshold value, carrying out a twice rotation identification confirmation process of firstly suspected and then confirmed, comparing the power (current) ratio threshold value with the conventional number of the tracking support bearing strings, calculating the completion rate of the tracking support string identification and periodically running the tracking support string identification task, establishing a plurality of identification ranges for synchronous and parallel identification in a designated identification range and the like are adopted to ensure the accuracy of the tracking support and string relation identification and improve the identification efficiency, the manpower, material resources and time consumed by a manual field mark re-entry system and manual check and adjustment are saved, the relation between the photovoltaic tracking support and the photovoltaic string and the photovoltaic inverter is automatically established, and the operation and maintenance of adjusting the tracking angle of a specific tracking support according to the inverter or the string is realized through a photovoltaic monitoring system by an operation and maintenance personnel.
Drawings
FIG. 1 is a schematic flow chart of the method.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and all the inventions which make use of the inventive concept are protected by the spirit and scope of the present invention as defined and defined in the appended claims to those skilled in the art.
As shown in fig. 1, the method for identifying the relationship between the tracking bracket and the group string and the inverter comprises the following steps:
s1: the preparation work before the relation between the tracking bracket and the group string is identified is completed, and the preparation work comprises the following steps:
1. setting the conventional number of the tracking brackets for bearing the group strings in the photovoltaic monitoring system according to the design planning of the power station and the actual installation condition of the tracking brackets and the group strings;
2. the photovoltaic monitoring system acquires the information of the tracking bracket communication control box, the tracking bracket and the relation between the tracking bracket communication control box and the data acquisition equipment from the photovoltaic tracking system by utilizing a three-party interface technology, and configures the relation between the tracking bracket communication control box and the data acquisition equipment in the photovoltaic monitoring system. In particular, when the complete association relationship between the tracking bracket control box and the data acquisition equipment cannot be acquired, the relationship between the tracking bracket control box and the data acquisition equipment cannot be configured in the photovoltaic monitoring system;
3. in the process of identifying the relationship between the tracking brackets and the strings and the inverters, the relationship between the tracking brackets and the strings and the inverters can be identified by repeatedly running the technical scheme in the system for many times under the influence of a plurality of factors such as server resources, the number of the tracking brackets, the number of the strings, the number of the inverters, weather irradiation conditions and the like used by the system. Thus, the relationship identification process will run in the system in the form of a task called a "track stent string relationship identification task". According to the illumination condition of the power station, the execution time period of the task for identifying the serial relation of the tracking support group is set in the photovoltaic monitoring system, and meanwhile, the execution time and the stop time of the task for identifying the serial relation of the tracking support group can be manually interfered according to the daily weather condition. Furthermore, in order to improve the flexibility of the application of the technical scheme and fully exert the hardware resource advantage of the rack server, the technical scheme allows the range of the tracking support and the group string to be identified to be manually specified to replace the system default tracking support group string identification process taking data acquisition as a unit or taking a whole power station as a unit, and the specified range is recorded as the identification range to be processed. At this time, the tracking bracket group string identification processing flow is consistent with the content defined by the technical scheme, and only the data acquisition part related to the processing is replaced by the identification range to be processed. When the relation between the tracking bracket communication control box and the data acquisition equipment is configured or the identification range to be processed is configured, a plurality of tracking bracket group string relation identification tasks can be established according to the data acquisition setting or the identification range to be processed, and further, the efficiency of tracking bracket group string relation identification is improved by fully utilizing server resources.
S2: the system automatically starts the tracking bracket group string relation recognition task according to the set execution time period, or manually triggers the starting of the tracking bracket group string relation recognition task. And after the tracking bracket group string relation identification task is started, acquiring a data acquisition equipment list with the tracking bracket group string relation identification rate less than 100% in the system as a data acquisition list to be processed. Wherein, the identification rate of the group string relation of the tracking bracket of the data acquisition device = the number of the tracking bracket which belongs to the data acquisition device is not empty and is not the number of the group strings which can not identify the group string number ≡the number of all the group strings of the data acquisition device × 100%.
Specifically, when the relation between the tracking bracket control box and the data acquisition equipment is not configured in the photovoltaic monitoring system, after the tracking bracket serial relation identification task is started, all tracking brackets which are not marked as identified are directly acquired to form a tracking bracket list to be identified, and meanwhile, the steps S103 to S105 are not executed any more, at the moment, the identification rate of the tracking bracket serial relation of the system is calculated, and the identification rate = the number of strings which are not empty and are not the number of unrecognizable strings in the system/(the number of strings of all strings in the system × 100%;
s3: the system judges whether unprocessed data acquisition equipment exists in the to-be-processed data acquisition list, if so, the system executes step S4, and analysis processing for identifying the serial relationship of the tracking bracket group is carried out on the unprocessed data acquisition equipment; if the tracking bracket and the group string do not exist, judging that the tracking bracket and the group string which need to be identified do not exist, and completing the analysis processing process of the task of identifying the group string relation of the tracking bracket;
s4: and acquiring an unprocessed data acquisition device from the to-be-processed data acquisition list, marking the unprocessed data acquisition device as to-be-processed data acquisition, and marking a group string which belongs to a tracking bracket under the to-be-processed data acquisition and is in a state of 0 or in a state of failure as a group string which cannot be identified. The group strings belong to group strings which cannot normally generate electricity, and the system cannot identify the tracking bracket group string relation. The group strings are removed in advance, so that the operation efficiency of the tracking bracket group string identification process can be improved. For the group strings marked as unrecognizable, the identification marking should be performed again when the next tracking bracket group string relation identification task is started, so as to avoid the problem that the group strings which have recovered to normally generate electricity are still marked as unrecognizable group strings, and the accuracy of the final identification result and the identification completion rate of the tracking bracket group string relation are affected; acquiring all tracking brackets which are not marked as identified under all tracking bracket communication control boxes associated with data acquisition to be processed to form a tracking bracket list to be identified;
s5: judging whether the tracking bracket to be identified exists in the tracking bracket list to be identified, and if so, performing the processing of the step S6; if not, the analysis processing is finished on all the tracking brackets to be identified under the current data acquisition to be processed, and the processing of the step S3 can be performed. In particular, when the relation between the tracking bracket control box and the data acquisition equipment is not configured in the photovoltaic monitoring system, judging that the bracket group serial relation identification task is completed, and stopping the operation of the task;
s6: and acquiring power values of the group strings which are empty and not unidentifiable by all the tracking brackets under the current data acquisition to be processed, and recording the power values as the power before the identification of each group string. In particular, when the relation between the control box of the tracking bracket and the data acquisition equipment is not configured in the photovoltaic monitoring system, the power values of all the group strings with the tracking brackets empty in the system are acquired and recorded as the power before the identification of each group string. In addition, in the implementation process of the technical scheme, string power can be replaced by string current for implementation;
s7: acquiring a tracking bracket to be identified which is not analyzed and processed, and greatly rotating the tracking bracket, for example: the rotation is vertical or back-lit. And after waiting for a period of time, acquiring the power values which are obtained when all tracking brackets are empty and the group strings cannot be identified under the current data acquisition to be processed, and recording the power values as the power after the identification of each group string. In particular, when the relation between the control box of the tracking bracket and the data acquisition equipment is not configured in the photovoltaic monitoring system, the power values of all the group strings with the tracking brackets being empty in the system are recorded as the power after the identification of each group string after waiting for a period of time. The large-amplitude rotation of the tracking bracket can cause larger fluctuation of the string power generation efficiency borne by the tracking bracket, so that the system can capture the change, and further the identification of the string relation of the tracking bracket is completed by utilizing the characteristic, so that the system is recommended to acquire the string power after the tracking bracket rotates after waiting for a period of time. The waiting time can be comprehensively considered and set according to factors such as the sensitivity of the group string affected by illumination, the illumination condition of a power station, the identification efficiency of the group string relation of the integral tracking bracket, and the like, for example: setting for 5 seconds;
s8: calculating the ratio of the power after the identification to the power before the identification of each group of strings, marking the group strings with the ratio less than or equal to the power ratio threshold as suspected group strings, and filling the tracking bracket to which the group strings belong as the serial number of the tracking bracket to be identified at this time. The power ratio threshold can be set by comprehensively considering factors such as the illumination influence degree of the group string and the illumination condition of the power station, for example: set to 0.2. The more accurate the threshold value is set, the more the accuracy of identifying the serial relationship of the tracking bracket group and the identification efficiency of the serial relationship of the whole tracking bracket group can be improved;
s9: restoring the tracking bracket to be identified which is analyzed and processed at the time from the position which is rotated by a large margin to the normal position, and obtaining the power marked as the suspected string after waiting for a period of time, and recording the power as the power after string restoration;
s10: each suspected string is analyzed and processed as follows: and calculating the ratio of the power after the identification of the suspected string to the power after the recovery, and if the ratio is larger than a power ratio threshold, clearing the suspected mark of the string and the serial number of the tracking bracket, wherein at the moment, the system considers that the previous power change of the suspected string is not caused by the rotation of the tracking bracket, and the tracking bracket analyzed and processed at the time does not bear the suspected string. In the actual running process of the string, besides the large rotation of the tracking bracket, other random probability factors can cause the generation of the string to be greatly changed, and the changes caused by the factors are not recovered in a short time. Thus, the system employs two rotations of steps S10 and S13 to provide accuracy in identifying the strings carried by the tracking stent. The first rotation in step S10 changes the power of the string carried by the tracking bracket from a normal larger value to a smaller value, and the second rotation in step S13 restores the string carried by the tracking bracket from a smaller value to a normal larger value, and the ratio of the power before and after the two rotations is smaller than the power ratio threshold. If the power ratio after the second rotation is not smaller than the power ratio threshold, that is, the group string after the rotation does not recover to normally generate power, the first power change of the group string can be considered to be caused by other factors, and the group string is not the group string carried by the tracking bracket to be identified at this time;
s11: the number of the residual suspected group strings after the analysis processing in the step S10 is compared with the conventional number value of the tracking bracket bearing group strings set in the step S1: if the comparison result is greater than, executing step S12; if the comparison result is equal, executing step S13; if the comparison result is less than, executing step S14;
s12: the rest suspected group strings are analyzed and processed one by one as follows: and adding a mark to be further confirmed in the suspected string, filling the tracking stent number to be suspected to the tracking stent, and finally removing the suspected mark of the string and the filled tracking stent number, wherein the string is treated as the string to be further confirmed. After all the remaining suspected strings are processed, the processing of step S5 is performed. When the power ratio threshold is set reasonably, the step is usually not frequently performed, and the actual environmental conditions for performing the step are often special, such as: in the situation of uneven topography or in the power station of not reserving enough interval between adjacent tracking supports in actual construction, the unavoidable phenomenon that the group strings carried by adjacent tracking supports are shielded because the tracking supports rotate, and then the generation efficiency of the shielded group strings is influenced. In extreme cases, the influence can cause the power ratio of the blocked group strings on the adjacent tracking brackets to be lower than the power ratio threshold value, so that the tracking brackets of the group strings carried by the adjacent tracking brackets are marked as the rotating tracking brackets, the phenomenon that the number of the group strings marked as the belonging tracking brackets is larger than the number of the conventional carrying group strings of the tracking brackets is generated, for the phenomenon, the occurrence of the phenomenon can be reduced by adjusting the power ratio threshold value, the belonging tracking brackets of the group strings can be corrected by carrying out the processing of the group string identification of the tracking brackets on the adjacent tracking brackets by the system, and the actual belonging tracking brackets of the group strings can be confirmed by a human-assisted mode;
s13, marking the tracking bracket to be identified as identified, indicating that the relationship between the tracking bracket and the group string is identified, and entering step S14;
s14: the suspected mark of each suspected group string is cleared, but the tracking stent number of the group string is reserved. Then, according to the inverter accessed by the group string, the relation between the inverter and the current identified tracking bracket is established. And updating the identification rate of the serial relationship of the tracking bracket group acquired by the data processed at this time, and returning to the step S5. In particular, when the relation between the tracking support control box and the data acquisition equipment is not configured in the photovoltaic monitoring system, the identification rate of the series relation of the tracking support group of the system is updated, and then the step S5 is returned.
For the phenomenon that the number of strings marked as belonging to the tracking bracket is greater than the number of conventional carrying strings of the tracking bracket in the step S12 of the above technical solution, after the task of identifying the string relationship of the tracking bracket performs the above technical solution each time, the following technical solution is implemented:
a1, screening out the group strings marked as the group strings to be further confirmed that the serial numbers of the affiliated tracking stents are not null and the group strings which are different from the serial numbers of the suspected tracking stents form a confirmed attribution group serial table
A2, for the group strings in the confirmed attribution group string list, adding the suspected tracking stent numbers of the group strings into the tracking stent list to be further confirmed one by one, and clearing the mark to be further confirmed and the suspected tracking stent numbers of the group strings;
a3, judging whether the tracking bracket to be confirmed which is not analyzed exists in the tracking bracket list to be further confirmed, if so, entering a step A4; otherwise, finishing the identification of the group string to be further confirmed;
a4, acquiring a tracking bracket to be confirmed, and acquiring all groups of strings with suspected tracking bracket numbers being the tracking bracket numbers;
a5, judging whether the number of the strings obtained in the step A4 is not equal to the conventional number of the tracking bracket bearing strings set by the system, if so, entering the step A6; otherwise, enter step A7;
a6, taking the confirmed tracking bracket as a legacy tracking bracket, and identifying after the next tracking bracket group string identification task is finished;
a7, modifying the acquired serial numbers of the tracking brackets of each group of strings into suspected tracking bracket numbers, clearing the marks to be further confirmed and the suspected tracking bracket numbers, and marking the confirmed tracking bracket as an identified tracking bracket;
a8: and (3) updating the identification rate of the tracking bracket group string of the data acquisition equipment to which the tracking bracket belongs, and returning to the step (A3). In particular, when the relation between the tracking bracket control box and the data acquisition equipment is not configured in the photovoltaic monitoring system, the identification rate of the tracking bracket group string of the whole system is updated.
In summary, the invention utilizes the characteristic that the large rotation of the photovoltaic tracking bracket can cause larger change of the generating efficiency (power or current) of the string, and automatically completes the relationship identification between the photovoltaic tracking bracket and the photovoltaic string by adopting the power (current) change ratio before and after rotation and the power (current) ratio threshold value set by the system. Meanwhile, the recognition accuracy and recognition efficiency are improved by adjusting the power (current) ratio threshold.
The invention eliminates the change of the generating efficiency of the strings generated by other random probability factors by using the two-time rotation identification confirmation process of suspected first and then confirmation, thereby improving the accuracy of automatic identification;
the invention eliminates the identification error generated by factors such as rotation shielding and the like through comparing with the conventional number of the photovoltaic tracking bracket bearing strings and carrying out secondary analysis of suspected tracking bracket numbers, further improves the identification accuracy, and further can set the number of strings and bracket numbers which are lower or higher than the conventional configuration due to the installation requirement.
According to the invention, factors such as a large number of photovoltaic tracking brackets and photovoltaic string, daily illumination conditions of a power station and the like are considered, and the relation recognition among all the photovoltaic tracking brackets, the photovoltaic string and the photovoltaic inverter is continuously completed in a mode of calculating the string recognition completion rate of the tracking brackets and periodically running the string recognition tasks of the tracking brackets and the string.
According to the invention, the hardware resource advantages of the rack server can be fully exerted by designating the identification range, and the identification efficiency of the relation between the photovoltaic tracking bracket and the photovoltaic group string is improved by adopting a mode of synchronously and parallelly identifying a plurality of identification ranges. The kinds of the identification range may include: the tracking support and the group string of the total station are placed together to form a large range, and the large range is divided into a plurality of mutually unaffected ranges according to the relation between the data acquisition equipment and the photovoltaic tracking support communication control box.
Claims (10)
1. A method of identifying a tracking bracket to string and inverter relationship, comprising the steps of:
s1, setting the conventional number of the tracking bracket bearing strings, and configuring the relation between the existing tracking bracket communication control box and the data acquisition equipment;
s2, marking a data acquisition equipment list with the identification rate of the serial relation of the tracking bracket group in the system being less than 100% as a data acquisition list to be processed;
s3, judging whether untreated data acquisition equipment exists in the data acquisition list to be treated, and if so, entering a step S4; otherwise, judging that the tracking bracket and the group string which need to be identified do not exist;
s4, taking the untreated data acquisition equipment as the data acquisition equipment to be treated, removing the group strings which cannot normally generate electricity under the untreated data acquisition equipment, and acquiring all tracking brackets which are associated with the data acquisition equipment and are not marked as the identified tracking brackets under the communication control box of all tracking brackets to form a tracking bracket list to be identified;
s5, judging whether the tracking bracket to be identified exists in the tracking bracket list to be identified, and if so, entering a step S6; otherwise, returning to the step S3;
s6, acquiring power values of all groups of strings which are empty and not unrecognizable in the tracking brackets under the current data acquisition equipment to be processed, and marking the power values as the power before recognition of each group of strings;
s7, acquiring a tracking bracket to be identified which is not analyzed, rotating the tracking bracket according to a set amplitude, acquiring power values which are empty and not unidentifiable in the current data acquisition equipment to be processed after a first set time, and marking the power values as power after identification of each group of strings;
s8, calculating the ratio of the power after the identification to the power before the identification of each group of strings, marking the group strings with the ratio less than or equal to a first power ratio threshold as suspected group strings, and filling the tracking bracket to which the suspected group strings belong as the serial number of the tracking bracket to be identified at this time;
s9, recovering the tracking bracket to be identified which rotates according to the set amplitude to the normal position, and acquiring the power marked as the suspected string after the second set time as the power after string recovery;
s10, calculating the ratio of the power after the identification of the suspected strings to the power after the recovery, and clearing the suspected marks of the strings with the ratio larger than a second power ratio threshold and the serial numbers of the tracking brackets to obtain the number of the residual suspected strings;
s11, comparing the number of the residual suspected group strings with the conventional number of the tracking bracket bearing group strings, and if the comparison result is larger than the conventional number, entering a step S12; if the comparison result is equal, the step S13 is entered; if the comparison result is smaller than the preset value, the step S14 is carried out;
s12, filling the tracking bracket numbers of the residual suspected group strings into the suspected tracking bracket, removing the suspected mark of the group strings and the filled tracking bracket numbers, taking the group strings as the group strings to be further confirmed, and returning to the step S5;
s13, marking the tracking bracket to be identified as identified, indicating that the relationship between the tracking bracket and the group string is identified, and entering step S14;
s14, clearing suspected marks of each suspected string, reserving the serial numbers of the tracking brackets of each suspected string, establishing the relation between the inverter and the current identified tracking bracket according to the inverter accessed by each suspected string, updating the identification rate of the tracking bracket string relation of the current data acquisition equipment, and returning to the step S5.
2. The method for identifying the relationship between the tracking bracket and the string and the inverter according to claim 1, wherein the specific method in step S1 is as follows:
setting the conventional number of the tracking brackets for bearing the group strings in the photovoltaic monitoring system according to the design planning of the power station and the actual installation condition of the tracking brackets and the group strings;
acquiring a tracking bracket communication control box, a tracking bracket and information of the relation between the tracking bracket communication control box and the tracking bracket from a photovoltaic tracking system through a third party interface, and configuring the relation between the tracking bracket communication control box and data acquisition equipment in a photovoltaic monitoring system; when the complete association relation between the tracking bracket control box and the data acquisition equipment cannot be acquired, the relation between the data acquisition equipment and the tracking bracket communication control box is not configured.
3. The method of identifying tracking brackets in relation to strings and inverters of claim 1, wherein in step S2:
if the data acquisition equipment is configured with the relation with the tracking bracket communication control box, the identification rate of the tracking bracket group string relation of the corresponding data acquisition equipment=the tracking bracket number belonged to under the data acquisition equipment is not empty and is not the number of group strings of the unrecognizable group string number ≡the number of all group strings under the data acquisition equipment × 100%; step S3 is entered;
if the relationship between the data acquisition equipment and the tracking bracket communication control box is not configured, all tracking brackets which are not marked as recognized are directly acquired to form a tracking bracket list to be recognized, and the recognition rate of the tracking bracket group string relationship of the corresponding data acquisition equipment = the number of the group strings which are not empty and are not the number of the unrecognizable group strings in the system ≡the number of the group strings of the total group strings in the system × 100%.
4. The method for identifying the relationship between the tracking bracket and the strings and the inverter according to claim 1, wherein the identification method of the strings which cannot normally generate electricity under the untreated data acquisition equipment is as follows:
and marking the group strings which are empty and have the 'generating power of 0 or the state of failure' of the tracking support under the untreated data acquisition equipment as the group strings which cannot be identified, namely marking the group strings as the group strings which cannot normally generate electricity.
5. The method according to claim 1, wherein in step S6, if the relationship between the tracking rack control box and the data acquisition device is not configured, the power values of all the strings with empty tracking racks in the system are recorded as the pre-string identification powers.
6. The method of claim 5, wherein the string current value is used as the string power value.
7. The method according to claim 1, wherein in step S7, if the relationship between the tracking rack control box and the data acquisition device is not configured, power values of all the strings with empty tracking racks in the acquisition system after the first set time are recorded as the power after the identification of each string.
8. The method of claim 1, wherein the first set time and the second set time are the same, each being 5 seconds.
9. The method of claim 1, wherein the first power ratio threshold and the second power ratio threshold are the same and are each 0.2.
10. The method of identifying a tracking bracket in relation to a string and an inverter of claim 1, wherein for a string to be further validated, the following operations are performed:
a1, screening out group strings which are marked as group strings to be further confirmed and are not empty in the number of the affiliated tracking bracket and are different from the number of the suspected tracking bracket to form a confirmed attribution group string list;
a2, for the group strings in the confirmed attribution group string list, adding the suspected tracking stent numbers of the group strings into the tracking stent list to be further confirmed one by one, and clearing the mark to be further confirmed and the suspected tracking stent numbers of the group strings;
a3, judging whether the tracking bracket to be confirmed which is not analyzed exists in the tracking bracket list to be further confirmed, if so, entering a step A4; otherwise, finishing the identification of the group string to be further confirmed;
a4, acquiring a tracking bracket to be confirmed, and acquiring all groups of strings with suspected tracking bracket numbers being the tracking bracket numbers;
a5, judging whether the number of the strings obtained in the step A4 is not equal to the conventional number of the tracking bracket bearing strings set by the system, if so, entering the step A6; otherwise, enter step A7;
a6, taking the confirmed tracking bracket as a legacy tracking bracket, and identifying after the next tracking bracket group string identification task is finished;
a7, modifying the acquired serial numbers of the tracking brackets of the groups of strings into suspected tracking bracket numbers, clearing the marks to be further confirmed and the suspected tracking bracket numbers, marking the confirmed tracking bracket this time as an identified tracking bracket, updating the identification rate of the tracking bracket groups of the data acquisition equipment to which the tracking bracket belongs, and returning to the step A3.
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