CN109272713A - A kind of the breakdown judge method for early warning and system of photovoltaic plant group set of strings - Google Patents
A kind of the breakdown judge method for early warning and system of photovoltaic plant group set of strings Download PDFInfo
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- CN109272713A CN109272713A CN201811174257.3A CN201811174257A CN109272713A CN 109272713 A CN109272713 A CN 109272713A CN 201811174257 A CN201811174257 A CN 201811174257A CN 109272713 A CN109272713 A CN 109272713A
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/18—Status alarms
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
This application provides a kind of breakdown judge method for early warning of photovoltaic plant group set of strings and systems, the judgement method for early warning includes that (1) carries out step (2) if the transient irradiation degree of group set of strings is greater than setting transient irradiation degree, otherwise, judge that early warning does not start；(2) with all branches of group set of strings for a unit set, if the branch current average value of a unit set is more than or equal to setting electric current average value, step (3) is carried out, otherwise, judge that early warning does not start；(3) electric current of each branch and the ratio of the branch current average value under same unit set are set as relative strength index, if relative strength index is less than relative strength index setting value, then otherwise circulation step (1) (2) n times judge that early warning does not start；(4) in continuous N number of cycle period, if relative strength index continuously repeats appearance 2 times and the case where less than relative strength index setting value, determine to be in abnormality, start early warning.
Description
Technical field
This application involves a kind of breakdown judge method for early warning of photovoltaic plant group set of strings and systems.
Background technique
In recent years, photovoltaic power generation was developed rapidly, and photovoltaic plant quantity and installed capacity are more and more huger, Mei Geqi
Industry possesses the power station quantity sharp increase of O&M, and various maintenance workloads are huge, and the requirement to O&M is higher and higher, the people of investment
Power and material resources are more and more, but the effect is unsatisfactory for actual O&M.
How the state of power station equipment to be monitored using the power station operation and maintenance information got, and timely and accurately
It has found that it is likely that the equipment to break down, informs the relevant personnel, it has also become the emphasis of current intelligent photovoltaic electricity power enterprise development.And institute
Most crucial equipment is component in photovoltaic power generation equipment, and component is composed in series a group string, header box that group forms in series and parallel (or group
String inverter), intelligent junction box or group string inverter are all that whether there is or not by current switching, voltage to judge the shape of branch at present
State realizes the positioning and judgement of failure.
Existing photovoltaic power station component, the header box of group string and group string composition or group string inverter, to component and group string failure
Diagnostic method, have the disadvantage in that (1) simply by component, group string voltage, electric current judged that Rule of judgment is simple；
(2) one component of special attention or group string, without it is whole and utilize overall data, Comprehensive Comparison；(3) can only judge to position
The branch of failure is had already appeared, cannot judge break down or abnormal component, group are gone here and there.
Summary of the invention
The application technical problems to be solved be to provide a kind of photovoltaic plant group set of strings breakdown judge method for early warning and
System.
In order to solve the above-mentioned technical problem, this application provides a kind of pre- police of breakdown judge of photovoltaic plant group set of strings
Method, which is characterized in that the judgement method for early warning includes,
(1) if the transient irradiation degree of group set of strings is greater than setting transient irradiation degree, step (2) are carried out, otherwise, judgement is pre-
Police does not start；
(2) with all branches of group set of strings for a unit set, if the branch current average value of a unit set
More than or equal to setting electric current average value, then step (3) are carried out, otherwise, judges that early warning does not start；
(3) set each branch electric current and same unit set under branch current average value ratio as relative strength index,
If relative strength index is less than relative strength index setting value, otherwise circulation step (1) (2) n times judge that early warning does not start；
(4) in continuous N number of cycle period, if relative strength index continuously repeats appearance 2 times and sets less than relative strength index
The case where definite value, then determines to be in abnormality, starts early warning.
Preferably, in step (2), the branch current average value of a unit set is one maximum value of removal and one
Average value after minimum value.
Preferably, in step (1), the setting transient irradiation 300 watts/square meter of degree.
Preferably, in step (2), setting electric current average value is 0.5A.
The application provides a kind of breakdown judge early warning system of photovoltaic plant group set of strings, which is characterized in that described is
System includes first judgment module, the second judgment module, third judgment module, warning module,
The first judgment module sets transient irradiation degree for judging whether the transient irradiation degree of group set of strings is greater than,
If the determination result is YES, then the second judgment module is executed, otherwise, warning module does not start；
With all branches of group set of strings for a unit set, second judgment module is for judging a unit
Whether the branch current average value of set is more than or equal to setting electric current average value, if the determination result is YES, then executes third judgement
Module, otherwise, warning module do not start；
If the ratio of the branch current average value under the electric current of each branch and same unit set is relative strength index, described
Third judgment module for judging whether relative strength index is less than relative strength index setting value, if the determination result is YES, then execute the
One judgment module and the second judgment module, in continuous N number of cycle period, if relative strength index continuously repeats appearance 2 times or more
The case where less than relative strength index setting value, then start warning module, otherwise, warning module does not start.
Preferably, the setting transient irradiation 300 watts/square meter of degree.
Preferably, setting electric current average value is 0.5A.
Preferably, the branch current average value of a unit set is flat after removing a maximum value and a minimum value
Mean value.
The breakdown judge method for early warning and system of a kind of photovoltaic plant group set of strings of the application have following beneficial to effect
Fruit:
(1) the present invention program algorithm realizes the failure pre-judging method of the branches such as component, group string, is the intelligence prison of equipment
Control, which is realized, provides scheme and method.
(2) program method is widely used, and can be applied to the branch troubles monitorings such as intelligent junction box, group string inverter,
Feasible practical scheme and method are provided for intelligent trouble diagnosis.
(3) invention realizes the real time intelligent control to photovoltaic plant group string branch, and analysis and processing method improves O&M
Efficiency is found the problem in advance, shortens fault handling time, keeps photovoltaic power generation equipment operation relatively reliable.
Detailed description of the invention
Fig. 1 is a kind of flow chart of the breakdown judge method for early warning of photovoltaic plant group set of strings.
Fig. 2 is application interface of the judgement early warning system in operation platform of the application.
Specific embodiment
The application is described further in the following with reference to the drawings and specific embodiments, so that those skilled in the art can be with
It more fully understands the application and can be practiced, but illustrated embodiment is not as the restriction to the application.
As shown in Figure 1, being a kind of embodiment of the breakdown judge method for early warning of photovoltaic plant group set of strings of the application, (1)
If organizing transient irradiation degree > 300 watt/square meter of set of strings, step (2) are carried out, otherwise, judge that early warning does not start；
(2) with all branches of a group string inverter or a direct current conflux case for a unit set, if a list
Average value I after branch current one maximum value of removal of position set and a minimum value is more than or equal to 0.5A, i.e.,Step (3) are then carried out, otherwise, judge that early warning does not start；
(3) the electric current I of each branch is setnWith the branch current average value under same unit setRatio refer to for power
α is marked, if relative strength index α is less than relative strength index setting value, i.e.,Then circulation step (1) (2) n times, otherwise, judgement are pre-
Police does not start；
(4) in continuous N number of cycle period, if relative strength index continuously repeats appearance 2 times and sets less than relative strength index
The case where definite value, then determines to be in abnormality, starts early warning.
The application also provides a kind of breakdown judge early warning system of photovoltaic plant group set of strings, and the system includes
One judgment module, the second judgment module, third judgment module, warning module, the first judgment module are used for judgement group string
Whether the transient irradiation degree of set, which is greater than setting transient irradiation degree, if the determination result is YES then executes the second judgment module, no
Then, warning module does not start；
With all branches of group set of strings for a unit set, second judgment module is for judging a unit
Whether the branch current average value of set is more than or equal to setting electric current average value, if the determination result is YES, then executes third judgement
Module, otherwise, warning module do not start；
If the ratio of the branch current average value under the electric current of each branch and same unit set is relative strength index, described
Third judgment module for judging whether relative strength index is less than relative strength index setting value, if the determination result is YES, then execute the
One judgment module and the second judgment module, in continuous N number of cycle period, if relative strength index continuously repeats appearance 2 times or more
The case where less than relative strength index setting value, then start warning module, otherwise, warning module does not start.
As shown in Fig. 2, the application interface of the judgement early warning system for the application, according to relative strength index ranking, branch or inverse
It is weak to become device index, alarms, operation maintenance personnel, technical staff is prompted to search reason, is looked into and finds that the group string branch there are several pieces
Component exists abnormal.
The breakdown judge method for early warning and system of a kind of photovoltaic plant group set of strings of the application have following beneficial to effect
Fruit:
(1) the present invention program algorithm realizes the failure pre-judging method of the branches such as component, group string, is the intelligence prison of equipment
Control, which is realized, provides scheme and method.
(2) program method is widely used, and can be applied to the branch troubles monitorings such as intelligent junction box, group string inverter,
Feasible practical scheme and method are provided for intelligent trouble diagnosis.
(3) invention realizes the real time intelligent control to photovoltaic plant group string branch, and analysis and processing method improves O&M
Efficiency is found the problem in advance, shortens fault handling time, keeps photovoltaic power generation equipment operation relatively reliable.
Embodiment described above is only the preferred embodiment lifted to absolutely prove the application, the protection model of the application
It encloses without being limited thereto.Those skilled in the art made equivalent substitute or transformation on the basis of the application, in the application
Protection scope within.The protection scope of the application is subject to claims.
Claims (8)
1. a kind of breakdown judge method for early warning of photovoltaic plant group set of strings, which is characterized in that the judgement method for early warning packet
It includes,
(1) if the transient irradiation degree of group set of strings is greater than setting transient irradiation degree, step (2) is carried out, otherwise, judge early warning not
Starting；
(2) with all branches of group set of strings for a unit set, if the branch current average value of a unit set is greater than
Equal to setting electric current average value, then step (3) are carried out, otherwise, judges that early warning does not start；
(3) electric current of each branch and the ratio of the branch current average value under same unit set are set as relative strength index, if by force
Weak index is less than relative strength index setting value, then otherwise circulation step (1) (2) n times judge that early warning does not start；
(4) in continuous N number of cycle period, if relative strength index continuously repeats appearance 2 times and less than relative strength index setting value
The case where, then determine to be in abnormality, starts early warning.
2. a kind of breakdown judge method for early warning of photovoltaic plant group set of strings as described in claim 1, which is characterized in that in step
Suddenly in (2), the branch current average value of a unit set is the average value removed after a maximum value and a minimum value.
3. a kind of breakdown judge method for early warning of photovoltaic plant group set of strings as described in claim 1, which is characterized in that in step
Suddenly in (1), the setting transient irradiation 300 watts/square meter of degree.
4. a kind of breakdown judge method for early warning of photovoltaic plant group set of strings as described in claim 1, which is characterized in that in step
Suddenly in (2), setting electric current average value is 0.5A.
5. a kind of breakdown judge early warning system of photovoltaic plant group set of strings, which is characterized in that the system includes that first sentences
Disconnected module, the second judgment module, third judgment module, warning module,
The first judgment module is for judging whether the transient irradiation degree of group set of strings is greater than setting transient irradiation degree, if sentencing
Disconnected result be it is yes, then execute the second judgment module, otherwise, warning module does not start；
With all branches of group set of strings for a unit set, second judgment module is for judging a unit set
Branch current average value whether be more than or equal to setting electric current average value, if the determination result is YES, then execute third judgment module,
Otherwise, warning module does not start；
If the ratio of the branch current average value under the electric current of each branch and same unit set is relative strength index, described the
Three judgment modules are for judging whether relative strength index is less than relative strength index setting value, if the determination result is YES, then execute first and sentence
Disconnected module and the second judgment module, in continuous N number of cycle period, if relative strength index continuously repeat appearance 2 times and less than
The case where relative strength index setting value, then starts warning module, and otherwise, warning module does not start.
6. a kind of breakdown judge early warning system of photovoltaic plant group set of strings according to claim 5, which is characterized in that institute
The setting transient irradiation 300 watts/square meter of degree stated.
7. a kind of breakdown judge early warning system of photovoltaic plant group set of strings according to claim 5, which is characterized in that set
Constant current average value is 0.5A.
8. a kind of breakdown judge early warning system of photovoltaic plant group set of strings according to claim 5, which is characterized in that one
The branch current average value of a unit set is the average value removed after a maximum value and a minimum value.
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| CN111588944A (en) * | 2020-05-29 | 2020-08-28 | 苏州麦德迅医疗科技有限公司 | Infusion pump blockage detection and warning method |
| CN112684403A (en) * | 2020-12-08 | 2021-04-20 | 国网四川省电力公司 | Fault detection method of intelligent electric meter based on data detection |
| CN112782495A (en) * | 2019-11-06 | 2021-05-11 | 成都鼎桥通信技术有限公司 | String abnormity identification method for photovoltaic power station |
| CN113541600A (en) * | 2021-05-25 | 2021-10-22 | 特变电工新疆新能源股份有限公司 | Method, system, equipment and storage medium for judging branch fault of photovoltaic power station |
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