CN110838821A - Photovoltaic power station fault control method and system - Google Patents
Photovoltaic power station fault control method and system Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S50/00—Monitoring or testing of PV systems, e.g. load balancing or fault identification
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S50/00—Monitoring or testing of PV systems, e.g. load balancing or fault identification
- H02S50/10—Testing of PV devices, e.g. of PV modules or single PV cells
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The application relates to a photovoltaic power station fault control method and system. The photovoltaic power station fault control method comprises the following steps: collecting operating parameters of each photovoltaic string connected to the same string inverter; transmitting the operation parameters; calculating the related dispersion rate of each photovoltaic group string according to the operation parameters of each photovoltaic group string; and determining the photovoltaic string with the fault symptom according to the related discrete rate of each photovoltaic string and the operation parameters of each photovoltaic string. This application is convenient for before each photovoltaic group cluster breaks down, maintains the photovoltaic group cluster of fault sign to prevent to destroy relevant equipment because of the trouble takes place, and then reduced photovoltaic power plant running cost.
Description
Technical Field
The application relates to the technical field of photovoltaic, in particular to a photovoltaic power station fault control method and system.
Background
A photovoltaic power plant typically includes a string inverter and a plurality of photovoltaic strings. Each photovoltaic string includes a plurality of photovoltaic modules. And a plurality of photovoltaic strings are connected to the same string inverter. The string inverter converts the direct current into alternating current so as to be connected into a power grid.
With the popularization of photovoltaic power stations, the photovoltaic power stations have strong requirements on economic and efficient operation and maintenance of the power stations. However, conventional photovoltaic power plants typically have sensing devices within the string inverters. After a photovoltaic string of the photovoltaic power station breaks down, the detection device detects that the string inverter works abnormally and sends an abnormal alarm signal. Then, the worker performs the related obstacle clearance work. At this time, since the fault has occurred, the influence caused by the fault has evolved to the extreme, and thus it is very likely that the relevant equipment will be damaged, thereby increasing the operating cost of the photovoltaic power station.
Disclosure of Invention
Therefore, it is necessary to provide a method and a system for controlling a fault of a photovoltaic power plant, which can reduce the operation cost of the photovoltaic power plant, in order to solve the above technical problems.
A photovoltaic power station fault control method comprises the following steps:
collecting operating parameters of each photovoltaic string connected to the same string inverter;
transmitting the operating parameters;
calculating the related dispersion rate of each photovoltaic group string according to the operation parameters of each photovoltaic group string;
and determining the photovoltaic string with the fault sign according to the relevant dispersion rate of each photovoltaic string and the operation parameters of each photovoltaic string.
In one embodiment, after determining the photovoltaic string with the fault sign according to the operating parameter dispersion rate and the operating parameter distribution of each photovoltaic string, the method further includes:
and carrying out fault symptom classification and identification on the photovoltaic group strings with fault symptoms.
In one embodiment, the photovoltaic string with fault signs is subjected to fault sign classification identification, and the method comprises the following steps:
monitoring the photovoltaic string with fault signs for a single duration of the fault signs;
judging whether the single duration reaches a preset time or not;
when the single duration reaches a preset time, identifying the type of the fault symptom as a problem type;
when the single duration time does not reach the preset time, accumulating and recording the times of occurrence of fault signs;
after the photovoltaic power station fault control is carried out for m times continuously, whether the times of occurrence of fault signs reach preset times is judged;
after the photovoltaic power station fault control is carried out for m times continuously, when the frequency of occurrence of fault signs reaches the preset frequency, identifying the type of the fault signs as a problem type;
and after the photovoltaic power station fault control is carried out for m times continuously, when the frequency of occurrence of fault symptoms does not reach the preset frequency, identifying that the type of the fault symptoms is accidental, wherein m is more than or equal to 2.
In one embodiment, while recording the number of times of occurrence of the fault symptom for the first time, the method further includes:
and inquiring the historical operation condition of the photovoltaic string with the fault symptom, and setting the preset times according to the historical operation condition.
In one embodiment, after the photovoltaic string with fault signs is subjected to fault sign classification and identification, the method further comprises the following steps:
and outputting the processing information of the photovoltaic string with the fault symptom according to the classification and identification result.
In one embodiment, the operating parameters include current and voltage, and the associated dispersion ratio includes a power dispersion ratio;
calculating the relevant dispersion rate of each photovoltaic group string according to the operating parameters of each photovoltaic group string comprises the following steps: and calculating the power discrete rate of each photovoltaic group string according to the current and the voltage of each photovoltaic group string.
In one embodiment, calculating the power dispersion ratio of each photovoltaic string according to the current and the voltage of each photovoltaic string includes:
judging whether the collected operation parameters are effective or not according to the current, the voltage and the lowest working power of each photovoltaic group string;
and when the collected operation parameters are effective, calculating the power discrete rate of each photovoltaic group string.
A photovoltaic power plant fault control system, comprising:
the acquisition module is used for acquiring the operating parameters of each photovoltaic string connected to the same string inverter;
the communication module is used for transmitting the operation parameters;
the operation module is used for calculating the related dispersion rate of each photovoltaic group string according to the operation parameters of each photovoltaic group string;
and the analysis module is used for determining the photovoltaic string with the fault symptom according to the relevant dispersion rate of each photovoltaic string and the operation parameters of each photovoltaic string.
In one embodiment, the photovoltaic power plant fault control system further comprises a classification identification module, and the classification identification module is used for performing fault symptom classification identification on the photovoltaic group string with fault symptoms.
In one embodiment, the photovoltaic power station fault control system further comprises an information output module, and the information output module is used for outputting processing information of the photovoltaic group string with fault symptoms according to the result of the classification identification.
The photovoltaic power station fault control method is different from a traditional mode that whether the work of the string inverter of the photovoltaic power station is abnormal or not is detected, the operation parameters of each photovoltaic string connected to the same string inverter are directly collected and transmitted, and the photovoltaic string with fault symptoms can be determined before each photovoltaic string connected to the same string inverter breaks down. Therefore, before each photovoltaic string breaks down, the photovoltaic strings with the fault signs are maintained, so that the damage to relevant equipment caused by the faults is prevented, and the running cost of the photovoltaic power station is reduced.
Drawings
FIG. 1 is a flow diagram of a photovoltaic power plant fault control method in one embodiment;
FIG. 2 is a flow chart of a photovoltaic power plant fault control method in another embodiment;
FIG. 3 is a flow diagram of the classification and identification of signs of failure for a string of photovoltaic strings with signs of failure in one embodiment;
FIG. 4 is a schematic diagram of a photovoltaic power plant fault control system module in one embodiment;
FIG. 5 is a schematic diagram of a photovoltaic power plant fault control system module in another embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In one embodiment, as shown in fig. 1, there is provided a photovoltaic power plant fault control method, comprising the steps of:
and step S1, collecting the operation parameters of each photovoltaic string connected to the same string inverter.
In a photovoltaic power plant, a string inverter and a plurality of photovoltaic strings are generally included. Each photovoltaic string includes a plurality of photovoltaic modules connected in series. And a plurality of photovoltaic strings are connected to the same string inverter. The string inverter converts the direct current into alternating current so as to be connected into a power grid.
The method comprises the following steps of collecting the operation parameters of each photovoltaic string connected to the same group of string inverters, namely directly collecting the operation parameters of each photovoltaic string connected to the same group of string inverters. "operating parameters" may include current, voltage, temperature, and the like.
When the operation parameters are collected, component-level data collection components can be added to collect the operation parameters of each photovoltaic group string. Or, an intelligent component with a data acquisition networking function can be used to replace a component used in the current photovoltaic string.
Step S2, the operation parameters are transmitted.
In the step, after the operation parameters of all photovoltaic strings connected to the same group of string inverters are collected, the collected operation parameters are transmitted. The specific transmission mode can be selected according to actual conditions. For example, when the conditions allow, in order to improve the reliability of the signal, a wired transmission mode may be selected to transmit the collected operation data.
Alternatively, when a wired network deployment condition is not met or a wired network deployment cost is high in a complex photovoltaic power station (for example, a distributed rooftop photovoltaic power station, a distributed mountain photovoltaic power station, and the like) deployment environment, a wireless transmission mode may be selected. At this time, in order to prevent the signal transmission from being interrupted or interfered, disturbed, etc. due to the network failure, a transmission mode of breakpoint continuous transmission may be collected.
And step S3, calculating the relevant dispersion rate of each photovoltaic string according to the operation parameters of each photovoltaic string.
As previously noted, "operating parameters" may include current, voltage, temperature, and the like. The "relevant dispersion ratio" herein is a dispersion ratio of each photovoltaic string that can be calculated from the operating parameters of each photovoltaic string. Specifically, the current dispersion rate, the voltage dispersion rate, the temperature dispersion rate, or the power dispersion rate may be used.
The associated dispersion ratio calculation formula may be:
wherein n represents the number of photovoltaic strings accessed to the same group of string inverters, X1 to Xn are the relevant parameter values of each photovoltaic string, and avgX represents the average relevant parameter value of all photovoltaic strings under the same group of string inverters.
Specifically, the correlation discrete rate may include a power discrete rate, and the power discrete rate calculation formula may be:
where n represents the number of pv strings connected to the same string inverter, P1 to Pn represent power values of the pv strings (which may be obtained from (current × voltage) of each pv module), and avgP represents an average power value of all pv strings under the same string inverter.
And step S4, determining the photovoltaic string with fault symptoms according to the relevant dispersion rate of each photovoltaic string and the operation parameters of each photovoltaic string.
In particular, this step may provide for determining, when one or several associated dispersion rates (e.g. power dispersion rates) of the respective strings of photovoltaic groups are greater than an associated threshold range, strings of photovoltaic groups having a fault sign in the strings of photovoltaic groups connected to the same string inverter.
Then, the distribution (e.g., power distribution) of the relevant parameter values of each photovoltaic string is determined according to the operating parameters of each photovoltaic string (e.g., according to the current and voltage of each photovoltaic string). And then, determining the photovoltaic string with the fault sign according to the distribution of each photovoltaic string (namely determining which photovoltaic string has the fault sign).
It is worth noting here that the above steps are not necessarily performed sequentially in order. For example, when the photovoltaic power station fault control is carried out once, the steps can be repeatedly and circularly carried out. The frequency of the photovoltaic power station fault control can be set according to actual conditions, for example, the photovoltaic power station fault control can be set once a day.
In a conventional photovoltaic power plant, a detection device is provided within the string inverter. After a photovoltaic string of the photovoltaic power station breaks down, the detection device can detect that the string inverter works abnormally and send an abnormal alarm signal. Then, the worker performs the related troubleshooting work.
In this embodiment, different from a conventional method for detecting whether the operation of the string inverter is abnormal in the photovoltaic power station, the operation parameters of each photovoltaic string connected to the same string inverter are directly collected and transmitted, and before each photovoltaic string connected to the same string inverter fails, the photovoltaic string with the symptom of failure can be determined. Therefore, according to the photovoltaic string maintenance method and device, the photovoltaic strings with fault signs can be maintained conveniently before faults of the photovoltaic strings occur, so that damage to relevant equipment due to faults is prevented, and running cost of a photovoltaic power station is reduced.
Meanwhile, in a traditional photovoltaic power station, a group string inverter is detected through a detection device, only a photovoltaic group string with a fault in each photovoltaic group string connected with the group string inverter can be obtained, but which photovoltaic group string has the fault cannot be determined, and a worker needs to confirm the photovoltaic group string on the site of the power station. The method and the device can determine the photovoltaic string with the fault sign, and further are convenient for maintenance personnel to directly maintain the target photovoltaic string, and the power efficiency is improved.
In one embodiment, referring to fig. 2, after step S4 (determining the photovoltaic string with failure sign according to the operating parameter dispersion rate and the operating parameter distribution of each photovoltaic string), the method further includes:
and step S5, carrying out fault sign classification and identification on the photovoltaic string with fault signs.
The classification identification is to identify the type of the fault symptom, which may include a problem type, an accidental type, and the like. Therefore, the embodiment can further determine whether the photovoltaic string with the fault sign is likely to be in fault or not, so that the photovoltaic power station can be maintained more accurately subsequently.
In one embodiment, referring to fig. 3, the photovoltaic string with fault signs is subjected to fault sign classification identification, including:
step S51, monitoring the single duration of the fault sign for the string of photovoltaic strings in which the fault sign occurs.
The single duration of the fault sign of the photovoltaic string with the fault sign means that the photovoltaic string with the fault sign continues to have the fault sign when the photovoltaic power station fault control is performed once. This step monitors this time.
In step S52, it is determined whether the single duration reaches a preset time.
The "preset time" can be determined according to actual conditions. For example, the time for performing primary photovoltaic plant fault control is 12 hours, and the "preset time" may be set to 6 hours.
And step S53, when the single duration reaches the preset time, identifying the type of the fault symptom as a problem type.
The single duration reaches the preset time, namely when the photovoltaic power station fault control is carried out once, the time of the photovoltaic string with fault signs continuously having the fault signs reaches the preset time. At this time, the fault sign of the photovoltaic string exists continuously, which indicates that the fault sign is non-accidental, and the fault sign is likely to cause the fault to finally occur. Therefore, the type of the failure symptom is identified as problem type at this time. After the type of the fault sign is identified as problem type, the staff can maintain the photovoltaic string with the fault sign in time, and therefore the fault is prevented from occurring finally.
And step S54, when the single duration time does not reach the preset time, the times of fault symptoms are recorded in an accumulated mode.
The single duration time does not reach the preset time, namely when the photovoltaic power station fault control is carried out once, the photovoltaic group string with the fault sign has the fault sign, but the time with the fault sign does not reach the preset time. At this time, the fault sign of the photovoltaic string disappears after a period of time, which indicates that the fault may be caused by some accidental disturbance factor (for example, a cloud drifting), and may not cause the fault to finally occur. Therefore, the number of times of fault symptoms is recorded in an accumulated mode, namely the photovoltaic string with the fault symptoms but the fault symptom duration time does not reach the preset time is continuously observed, and the photovoltaic string is accumulated and counted each time the fault symptom occurs.
And step S55, after the photovoltaic power station fault control is carried out for m times continuously, judging whether the times of the fault signs reach the preset times or not.
As described above, the frequency of performing the photovoltaic power plant fault control may be set according to actual conditions, for example, the photovoltaic power plant fault control may be performed once a day. At the moment, the photovoltaic power station fault control is performed for m times continuously, namely the photovoltaic power station fault control is performed for m days continuously. The "preset times" may also be determined according to actual conditions. For example, it may be set to 3 times or 4 times.
And step S56, when the number of times of fault symptoms reaches the preset number after the photovoltaic power station fault control is carried out for m times continuously, identifying the type of the fault symptoms as problem type, wherein m is more than or equal to 2.
When the number of times of occurrence of the fault symptoms reaches a preset number after the photovoltaic power station fault control is carried out for m times continuously, the fault symptoms of the photovoltaic string occur for multiple times, which shows that the fault symptoms are not accidental and can possibly cause the final occurrence of the fault. Therefore, the type of the failure symptom is identified as problem type at this time. After the type of the fault sign is identified as problem type, the staff can maintain the photovoltaic string with the fault sign in time, and therefore the fault is prevented from occurring finally.
And step S57, after the photovoltaic power station fault control is carried out for m times continuously, when the frequency of the fault symptoms does not reach the preset frequency, identifying the type of the fault symptoms as an accidental type.
The frequency of the fault symptoms does not reach the preset frequency, the fault symptoms of the photovoltaic string are limited for a plurality of times, and the probability that the fault symptoms happen accidentally and finally occur is low. At this time, the type of the fault symptom is identified as an occasional type. After the type of the fault symptom is identified to be accidental, the fault symptom can be not processed, and further waste of manpower, material resources and the like is prevented.
In one embodiment, the photovoltaic power plant fault control method, while recording the number of times of occurrence of fault symptoms for the first time, further includes:
and inquiring the historical operation condition of the photovoltaic string with the fault symptom, and setting the preset times according to the historical operation condition.
Specifically, when the historical operating condition of the photovoltaic string is poor, the preset number of times may be set to t 1. And when the historical operating condition of the photovoltaic string is good, the preset times are set to be t2 times, and t2> t 1. Namely, the photovoltaic string with good historical operating condition can be observed for several times compared with the photovoltaic string with poor historical operating condition.
The historical operating conditions can be taken into consideration by integrating various factors, such as the existence of a device maintenance record, the existence of a device replacement record and the like.
In one embodiment, referring to fig. 2, after step S5 (identifying the photovoltaic string with fault symptom), the method further includes:
and step S6, outputting processing information of the photovoltaic string with fault signs according to the classification and identification results.
Specifically, it may be set that when the type of the failure symptom is identified as problem type, an assignment work order for performing maintenance on the photovoltaic group string in which the failure symptom occurs is output, and when the type of the failure symptom is identified as problem type, indication information for not performing processing on the photovoltaic group string in which the failure symptom occurs is output.
In the embodiment, the work orders can be automatically assigned according to the classification and identification results, and the intelligence of the fault control of the photovoltaic power station is further improved. Specifically, when the assignment work order for maintaining the photovoltaic string with the fault sign is output, the name of the person who performs maintenance, the position of the warehouse where the tool needs to be used during maintenance, and the like can be automatically output according to the position of the photovoltaic string with the fault sign.
Of course, in other embodiments, after the photovoltaic string with the fault sign is subjected to the fault sign classification identification, how to process the photovoltaic string with the fault sign can also be controlled (not automatically controlled) by a commander.
In one embodiment, the operating parameters include current and voltage, and the associated dispersion ratio includes a power dispersion ratio; step S3 (calculating the associated dispersion ratio of each photovoltaic string according to the operating parameters of each photovoltaic string) includes: and calculating the power discrete rate of each photovoltaic group string according to the current and the voltage of each photovoltaic group string.
As explained above, the power discrete rate calculation formula may be:
where n represents the number of pv strings connected to the same string inverter, P1 to Pn represent power values of the pv strings (which may be obtained from (current × voltage) of each pv module), and avgP represents an average power value of all pv strings under the same string inverter.
Further, in this embodiment, calculating the power dispersion ratio of each photovoltaic string according to the current and the voltage of each photovoltaic string further includes:
and step S31, judging whether the collected operation parameters are effective or not according to the current, the voltage and the lowest working power of each photovoltaic group string.
The minimum operating power is the power that indicates that the data of the photovoltaic string is normal, and can be derived from (installed capacity power threshold). The installed capacity of a photovoltaic string, i.e. its theoretical maximum outputtable power. The power threshold is a correlation coefficient (e.g., may be 0.9, 0.95, 0.85, etc.).
Since each photovoltaic string includes a plurality of photovoltaic modules. The inclination angle, orientation and other conditions of each photovoltaic module in each photovoltaic group string are different. Thus, even for strings of photovoltaic strings having the same installed capacity, their power thresholds may be different. Each photovoltaic group string can be provided with a power threshold value according to the self condition.
Whether the collected operation parameters are effective or not is judged according to the current, the voltage and the lowest working power of each photovoltaic group string, and specifically, whether the collected operation parameters are effective or not can be judged by comparing the (current and voltage) of each photovoltaic group string with the (installed capacity and power threshold value). When the current voltage of each photovoltaic string is larger than the installed capacity power threshold value, the collected operation parameters are valid, otherwise, the collected operation parameters are invalid.
And step S32, calculating the power discrete rate of each photovoltaic string when the collected operation parameters are effective.
In this embodiment, before calculating the power dispersion rate of each photovoltaic string, it is first determined whether the collected operating parameters (specifically, current and voltage) are valid. And calculating the power discrete rate of each photovoltaic string only when the collected operation parameters are effective.
Therefore, the embodiment can filter out the collected invalid data (dirty data), thereby ensuring the accuracy of the power discrete rate calculation.
In one embodiment, a photovoltaic power plant fault control system is provided, referring to fig. 4, including an acquisition module 100, a communication module 200, an operation module 300, and an analysis module 400. Wherein:
the collection module 100 is configured to collect operating parameters of each photovoltaic string connected to the same string inverter.
And the communication module 200 is used for transmitting the operation parameters.
And the operation module 300 is configured to calculate the relevant dispersion ratio of each photovoltaic string according to the operation parameter of each photovoltaic string.
And the analysis module 400 is configured to determine the photovoltaic string with the fault symptom according to the relevant dispersion rate of each photovoltaic string and the operating parameter of each photovoltaic string.
Referring to fig. 5, further, the photovoltaic power plant fault control system may further include a classification identification module 500. The classification identification module 500 is used for performing fault symptom classification identification on the photovoltaic group string with fault symptoms.
Still further, the photovoltaic power plant fault control system may further include an information output module 600. The information output module 600 is configured to output processing information of the photovoltaic string with the fault symptom according to the result of the classification and identification.
For specific limitations of the photovoltaic power plant fault control system, reference may be made to the above limitations of the photovoltaic power plant fault control method, which are not described herein again. All or part of each module in the photovoltaic power station fault control system can be realized through software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A fault control method for a photovoltaic power station is characterized by comprising the following steps:
collecting operating parameters of each photovoltaic string connected to the same string inverter;
transmitting the operating parameters;
calculating the related dispersion rate of each photovoltaic group string according to the operation parameters of each photovoltaic group string;
and determining the photovoltaic string with the fault sign according to the relevant dispersion rate of each photovoltaic string and the operation parameters of each photovoltaic string.
2. The method for controlling the faults of the photovoltaic power stations according to claim 1, wherein after the photovoltaic group strings with the fault signs are determined according to the operating parameter dispersion rate and the operating parameter distribution of each photovoltaic group string, the method further comprises the following steps:
and carrying out fault symptom classification and identification on the photovoltaic group strings with fault symptoms.
3. The photovoltaic power plant fault control method of claim 2, wherein the step of performing fault symptom classification identification on the photovoltaic string with fault symptoms comprises the following steps:
monitoring the photovoltaic string with fault signs for a single duration of the fault signs;
judging whether the single duration reaches a preset time or not;
when the single duration reaches a preset time, identifying the type of the fault symptom as a problem type;
when the single duration time does not reach the preset time, accumulating and recording the times of occurrence of fault signs;
after the photovoltaic power station fault control is carried out for m times continuously, whether the times of occurrence of fault signs reach preset times is judged;
after the photovoltaic power station fault control is carried out for m times continuously, when the frequency of occurrence of fault signs reaches the preset frequency, identifying the type of the fault signs as a problem type;
and after the photovoltaic power station fault control is carried out for m times continuously, when the frequency of occurrence of fault symptoms does not reach the preset frequency, identifying that the type of the fault symptoms is accidental, wherein m is more than or equal to 2.
4. The photovoltaic power plant fault control method of claim 3 further comprising, while first recording the number of occurrences of the symptom of the fault:
and inquiring the historical operation condition of the photovoltaic string with the fault symptom, and setting the preset times according to the historical operation condition.
5. The photovoltaic power plant fault control method according to any one of claims 2 to 4, characterized in that after the photovoltaic string with fault signs is subjected to fault sign classification and identification, the method further comprises the following steps:
and outputting the processing information of the photovoltaic string with the fault symptom according to the classification and identification result.
6. The photovoltaic power plant fault control method of claim 1 wherein the operating parameters include current and voltage, the associated dispersion ratio includes a power dispersion ratio;
calculating the relevant dispersion rate of each photovoltaic group string according to the operating parameters of each photovoltaic group string comprises the following steps: and calculating the power discrete rate of each photovoltaic group string according to the current and the voltage of each photovoltaic group string.
7. The method of claim 6, wherein calculating the power dispersion ratio of each photovoltaic string according to the current and the voltage of each photovoltaic string comprises:
judging whether the collected operation parameters are effective or not according to the current, the voltage and the lowest working power of each photovoltaic group string;
and when the collected operation parameters are effective, calculating the power discrete rate of each photovoltaic group string.
8. A photovoltaic power plant fault control system, comprising:
the acquisition module is used for acquiring the operating parameters of each photovoltaic string connected to the same string inverter;
the communication module is used for transmitting the operation parameters;
the operation module is used for calculating the related dispersion rate of each photovoltaic group string according to the operation parameters of each photovoltaic group string;
and the analysis module is used for determining the photovoltaic string with the fault symptom according to the relevant dispersion rate of each photovoltaic string and the operation parameters of each photovoltaic string.
9. The photovoltaic power plant fault control system of claim 8, further comprising a classification identification module for performing fault symptom classification identification on the photovoltaic string with fault symptoms.
10. The photovoltaic power plant fault control system of claim 9, further comprising an information output module configured to output processing information for the string of photovoltaic groups exhibiting signs of fault based on the result of the classification.
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