CN116136556A - Wind channel health detection method and device for photovoltaic inverter - Google Patents

Wind channel health detection method and device for photovoltaic inverter Download PDF

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Publication number
CN116136556A
CN116136556A CN202310139055.XA CN202310139055A CN116136556A CN 116136556 A CN116136556 A CN 116136556A CN 202310139055 A CN202310139055 A CN 202310139055A CN 116136556 A CN116136556 A CN 116136556A
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photovoltaic inverter
output power
air duct
health
health state
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刘坤
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Sungrow Power Supply Co Ltd
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Sungrow Power Supply Co Ltd
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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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K13/00—Thermometers specially adapted for specific purposes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00—Arrangements for measuring electric power or power factor
    • 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
    • G08B21/182—Level alarms, e.g. alarms responsive to variables exceeding a threshold

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  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Photovoltaic Devices (AREA)

Abstract

The application discloses a method and a device for detecting the health of an air duct of a photovoltaic inverter. Then, from the output power of the photovoltaic inverter, a first relative temperature corresponding to the output power can be obtained. And finally, detecting the air duct of the photovoltaic inverter according to the output power interval, the first relative temperature corresponding to the output power, the preset cut-off power value of the photovoltaic inverter and the health state alarm threshold curve, and obtaining a detection result of the air duct of the photovoltaic inverter. Therefore, the method can quickly and simply detect the air duct of the photovoltaic inverter without the need of a worker to check the air duct on site, and enhances the continuous operation capability of the photovoltaic inverter, thereby improving the operation and maintenance level of the power station.

Description

Wind channel health detection method and device for photovoltaic inverter
Technical Field
The application relates to the technical field of photovoltaic inverters, in particular to a method and a device for detecting the health of an air duct of a photovoltaic inverter.
Background
A photovoltaic inverter is a power conditioning apparatus composed of semiconductor devices, and is mainly used to convert dc power into ac power of a common frequency.
The photovoltaic inverter mostly adopts an air cooling heat dissipation mode, and the photovoltaic inverter is mostly installed in severe natural environments such as the outdoor environment, air is sucked in from an air inlet of the inverter and blown out from an air outlet, and heat in the photovoltaic inverter is taken away through an air duct in the process, so that the temperature balance in the photovoltaic inverter can be maintained. Therefore, dust, sand, poplar catkin and other foreign matters in the air are easy to attach to the air inlet of the inverter case to block the air duct of the photovoltaic inverter, so that the photovoltaic inverter is stopped due to high-temperature faults caused by abnormal heat dissipation.
At present, for the problem of blockage of an air duct of a photovoltaic inverter, power station maintenance personnel can only be relied on to periodically overhaul the inverter, so that the workload is huge, the failure shutdown is caused due to untimely maintenance, and the generated energy loss is caused. Therefore, health detection of the wind channel of the photovoltaic inverter is a problem to be solved.
Disclosure of Invention
In view of this, the embodiments of the present application provide a method and an apparatus for detecting the health of an air duct of a photovoltaic inverter, which aim to quickly detect the air duct of the photovoltaic inverter.
In a first aspect, an embodiment of the present application provides a method for detecting air duct health of a photovoltaic inverter, where the method includes:
acquiring a health state alarm threshold curve of the air duct;
determining an output power interval for detection according to the output power of the photovoltaic inverter;
obtaining a first relative temperature corresponding to the output power according to the output power of the photovoltaic inverter;
and detecting the air duct of the photovoltaic inverter according to the output power interval, the first relative temperature, the preset cut-off power value of the photovoltaic inverter and the health state alarm threshold curve to obtain a detection result of the air duct of the photovoltaic inverter.
Optionally, the determining step of the health status alarm threshold curve includes:
acquiring the health state of the air duct of the photovoltaic inverter according to the blocking area of the air duct of the photovoltaic inverter, and determining the health state alarm threshold;
performing difference solving processing according to the temperature value of the photovoltaic inverter and the temperature value of the air inlet of the air duct of the photovoltaic inverter to obtain a second relative temperature;
obtaining a health threshold curve corresponding to the health state of the air duct of the photovoltaic inverter according to the second relative temperature, the health state of the air duct of the photovoltaic inverter and the output power of the photovoltaic inverter;
and determining the health state alarm threshold curve according to the health state curve corresponding to the health state of the air duct of the photovoltaic inverter and the health state alarm threshold.
Optionally, the health status of the wind tunnel of the photovoltaic inverter includes healthy, sub-healthy, unhealthy, ill, or faulty.
Optionally, the determining the output power interval for detection according to the output power of the photovoltaic inverter includes:
and determining the output power interval for detection according to the maximum power value and the preset number in the output power of the photovoltaic inverter.
Optionally, the obtaining, according to the output power of the photovoltaic inverter, a first relative temperature corresponding to the output power includes:
obtaining a first relative temperature corresponding to the output power in the output power interval according to the output power in the output power interval;
detecting the air duct of the photovoltaic inverter according to the output power interval, the first relative temperature, the preset cut-off power value of the photovoltaic inverter and the health state alarm threshold curve to obtain a detection result of the air duct of the photovoltaic inverter, wherein the detection result comprises the following steps:
and detecting the air duct of the photovoltaic inverter according to the output power interval, the first relative temperature corresponding to the output power in the output power interval, the preset cut-off power and the health state alarm threshold curve, and obtaining a detection result of the air duct of the photovoltaic inverter.
Optionally, the detecting the wind channel of the photovoltaic inverter according to the output power interval, the first relative temperature corresponding to the output power in the output power interval, the preset cut-off power and the health state alarm threshold curve, to obtain a detection result of the wind channel of the photovoltaic inverter, includes:
and when the preset cut-off power value is smaller than the minimum power value in the output power interval, detecting an air duct of the photovoltaic inverter according to the first relative temperature corresponding to the output power in the output power interval and the health state alarm threshold curve, and obtaining an air duct abnormality as a detection result.
Optionally, when the preset cut-off power value is smaller than the minimum power value in the output power interval, detecting an air duct of the photovoltaic inverter according to the sum of the first relative temperature corresponding to the output power in the output power interval and the health state alarm threshold curve, to obtain an air duct abnormality as a detection result, including:
when the preset cut-off power value is smaller than the minimum power value in the output power interval, counting the number that the first relative temperature corresponding to the output power in the output power interval exceeds the health state alarm threshold curve;
and when the number is greater than the preset number, obtaining the detection result as the abnormal air duct.
Optionally, when the number is greater than a preset number, after obtaining that the detection result is that the air duct is abnormal, the method further includes:
and carrying out air duct abnormality alarm according to the detection result.
Optionally, the method further comprises:
when the preset cut-off power value is larger than the maximum power value, the health state alarm threshold curve is acquired again;
and when the preset cut-off power value is larger than the minimum power value in the output power interval and the preset cut-off power value is smaller than the maximum power value, the health state alarm threshold curve is re-acquired.
Optionally, the method further comprises:
and sending the detection result to a server in a communication mode.
In a second aspect, an embodiment of the present application provides an air duct health detection device of a photovoltaic inverter, the device includes:
the acquisition module is used for acquiring a health state alarm threshold curve of the air duct;
the determining module is used for determining an output power interval for detection according to the output power of the photovoltaic inverter;
the obtaining module is used for obtaining a first relative temperature corresponding to the output power according to the output power of the photovoltaic inverter;
the detection module is used for detecting the air duct of the photovoltaic inverter according to the output power interval, the first relative temperature, the preset cut-off power value of the photovoltaic inverter and the health state alarm threshold curve, and obtaining a detection result of the air duct of the photovoltaic inverter.
In a third aspect, embodiments of the present application provide an air duct health detection apparatus of a photovoltaic inverter, the apparatus including:
a memory for storing a computer program;
and the processor is used for executing the computer program to enable the equipment to execute the wind channel health detection method of the photovoltaic inverter.
In a fourth aspect, an embodiment of the present application provides a computer storage medium, where a computer program is stored on the computer storage medium, and when the computer program is executed, a device running the computer program implements the wind channel health detection method of the photovoltaic inverter in the first aspect.
Compared with the prior art, the embodiment of the application has the following beneficial effects:
the embodiment of the application provides an air duct health detection method and device of a photovoltaic inverter, which comprises the steps of firstly, obtaining a health state alarm threshold curve of an air duct, and determining an output power interval for detection according to the output power of the photovoltaic inverter. Then, according to the output power of the photovoltaic inverter, a first relative temperature corresponding to the output power is obtained. And finally, detecting the air duct of the photovoltaic inverter according to the output power interval, the first relative temperature corresponding to the output power, the preset cut-off power value of the photovoltaic inverter and the health state alarm threshold curve, and obtaining a detection result of the air duct of the photovoltaic inverter. Therefore, according to the output power interval of the photovoltaic inverter, the first relative temperature corresponding to the output power, the preset cut-off power value and the health state alarm threshold curve, the air duct of the photovoltaic inverter can be detected, the detection result of the air duct of the photovoltaic inverter is obtained, the air duct of the photovoltaic inverter can be rapidly and simply detected without a worker going to check the air duct on site, the continuous operation capability of the photovoltaic inverter is enhanced, and the operation and maintenance level of a power station is improved.
Drawings
In order to more clearly illustrate the present embodiments or the technical solutions in the prior art, the drawings that are required for the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a system frame related to an application scenario in an embodiment of the present application;
fig. 2 is a flowchart of a method for detecting air duct health of a photovoltaic inverter according to an embodiment of the present application;
FIG. 3 is a schematic diagram of equivalent blockage area and operation time of an air duct provided by an embodiment of the present application;
FIG. 4 is a schematic diagram of a health threshold curve of an air duct according to an embodiment of the present disclosure;
FIG. 5 is a schematic diagram of an air duct detection process according to an embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of an air duct health detection device of a photovoltaic inverter according to an embodiment of the present application.
Detailed Description
In order to make the present application solution better understood by those skilled in the art, the following description will clearly and completely describe the technical solution in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
At present, for the problem of blockage of an air duct of a photovoltaic inverter, power station maintenance personnel can only be relied on to periodically overhaul the inverter, so that the workload is huge, the failure shutdown is caused due to untimely maintenance, and the generated energy loss is caused. Therefore, health detection of the wind channel of the photovoltaic inverter is a problem to be solved.
In order to solve the above-mentioned problems, in the embodiment of the present application, first, a health status alarm threshold curve of the wind tunnel is obtained, and an output power interval for detection is determined according to the output power of the photovoltaic inverter. Then, according to the output power of the photovoltaic inverter, a first relative temperature corresponding to the output power is obtained. And finally, detecting the air duct of the photovoltaic inverter according to the output power interval, the first relative temperature corresponding to the output power, the preset cut-off power value of the photovoltaic inverter and the health state alarm threshold curve, and obtaining a detection result of the air duct of the photovoltaic inverter. Therefore, according to the output power interval of the photovoltaic inverter, the first relative temperature corresponding to the output power, the preset cut-off power value and the health state alarm threshold curve, the air duct of the photovoltaic inverter can be detected, the detection result of the air duct of the photovoltaic inverter is obtained, the air duct of the photovoltaic inverter can be rapidly and simply detected without a worker going to check the air duct on site, the continuous operation capability of the photovoltaic inverter is enhanced, and the operation and maintenance level of a power station is improved.
For example, one of the scenarios of the embodiments of the present application may be applied to the scenario shown in fig. 1. The scene includes a data collector 101 and a photovoltaic inverter unit 102, wherein the photovoltaic inverter unit 102 includes output power and a relative temperature value of a photovoltaic inverter, and the like, and the data collector 101 acquires the output power and the relative temperature value of the photovoltaic inverter from the photovoltaic inverter unit 102 by adopting the implementation manner provided by the embodiment of the application.
First, in the above application scenario, although the description of the actions of the embodiments provided by the embodiments of the present application is performed by the data collector 101; however, the embodiment of the present application is not limited in terms of execution subject, as long as the actions disclosed in the embodiments provided by the embodiment of the present application are executed.
Second, the above scenario is only one example of a scenario provided in the embodiments of the present application, and the embodiments of the present application are not limited to this scenario.
The detailed implementation manner of the method and the device for detecting the air duct health of the photovoltaic inverter in the embodiment of the application is described in detail by an embodiment with reference to the accompanying drawings.
Referring to fig. 2, the flowchart of a method for detecting the health of an air duct of a photovoltaic inverter according to an embodiment of the present application, with reference to fig. 2, may specifically include:
s201: and acquiring a health state alarm threshold curve of the air duct.
The health state alarm threshold may be set manually, and the health state of the wind channel of the photovoltaic inverter may be obtained according to the blocking area of the wind channel of the photovoltaic inverter, and the health state alarm threshold may be determined, where the health state of the wind channel of the photovoltaic inverter may include healthy, sub-healthy, unhealthy, sick or faulty.
Referring to fig. 3, fig. 3 is a schematic diagram of an equivalent blocking area and an operation time of an air duct, and as the operation time increases from the first grid connection of an inverter, abnormal objects such as dust, wind sand, salix alkekengi and the like can be accumulated on the surface of an air inlet continuously, and the air duct of the inverter can be divided into five states of health, sub-health, unhealthy, illness and fault. As shown in FIG. 3, the conditions are healthy for 0-D1 days, sub-healthy for D1-D2 days, unhealthy for D2-D3 days, pathological for D3-D4 days, failure after D4, and the corresponding critical points are D1, D2, D3 and D4, respectivelyThreshold point for duct health diagnosis. The health of the air duct may be represented by an equivalent blockage area, different health conditions corresponding to different critical areas, in one possible embodiment the sub-health critical blockage area may be S 1 Percent, indicating slight blockage, the unhealthy critical blockage area may be S 2 The percentage indicates a moderate blockage, and the critical blockage area in the disease state can be S 3 Percent, representing severe blockage, the critical blockage area for failure may be S 4 In the embodiment of the application, the detection is mainly carried out aiming at the health, sub-health, unhealthy and pathological states of the air duct, the failure indicates that the photovoltaic inverter has been shut down and no detection is required.
The health state alarm threshold can be freely set, can be sub-health as a health state alarm threshold, can be unhealthy as a health state alarm threshold, and can be sick as a health state alarm threshold. As an example, when sub-health is the health status alarm threshold, when the occlusion area reaches S 1 % is that the inverter alarms so as to inform the power station operation and maintenance personnel that the maintenance can be performed in time. Of course, the health status alarm threshold is not specifically limited in this application, and does not affect the implementation of the embodiments of this application.
The health state alarm threshold curve is determined according to the health state alarm threshold curve and the health state alarm threshold corresponding to the health state, and firstly, difference processing can be carried out according to the temperature value of the photovoltaic inverter and the temperature value of the air inlet of the air duct of the photovoltaic inverter, so as to obtain a second relative temperature. Because the module temperature value of the photovoltaic inverter is influenced by the ambient temperature and the output power, the module temperature of the photovoltaic inverter and the ambient temperature basically have a linear relation under the same output power, and the temperature of the air inlet of the air duct is similar to the ambient temperature, so that the second relative temperature can be expressed by the formula 1 for decoupling the influence of the ambient temperature:
Δt＝t m -t a (equation 1)
Wherein t is m Representing the actual temperature value, t, of a module of a photovoltaic inverter a Representation ofAnd the temperature value of the air inlet of the air duct. Then, a health threshold curve corresponding to the health state of the wind tunnel of the photovoltaic inverter can be obtained according to the second relative temperature, the health state of the wind tunnel of the photovoltaic inverter and the output power of the photovoltaic inverter.
Referring to FIG. 4, FIG. 4 is a schematic diagram of a health threshold curve of an air duct, wherein the curve power of the second relative temperature and the output power can be fitted by testing the steady state value of the second relative temperature value at each power value of 1% -110%, the air duct of the inverter can be considered to be healthy during a period of time when the inverter is operated for the first time, the steady state value of the second relative temperature at each power value of 1% -110% of the output power of the inverter is tested, and a second relative temperature value-output power curve is fitted as a health threshold curve t 0 The method comprises the steps of carrying out a first treatment on the surface of the When the blocking area reaches S 1 Testing the steady state value of the second relative temperature of the inverter output power of 1% -110% on each power value, fitting a second relative temperature value-output power curve to obtain a sub-health threshold curve t 1 The method comprises the steps of carrying out a first treatment on the surface of the When the blocking area reaches S 2 Testing the steady state value of the second relative temperature of the inverter output power of 1% -110% on each power value, fitting a second relative temperature value-output power curve to be an unhealthy threshold value curve t 2 The method comprises the steps of carrying out a first treatment on the surface of the When the blocking area reaches S 3 And testing the steady-state value of the second relative temperature of the inverter at each power value of 1% -110% of the output power, and fitting a second relative temperature value-output power curve which is a pathological threshold curve t3. And finally, determining a health state alarm threshold curve according to a health state threshold curve corresponding to the health state of the air duct of the photovoltaic inverter and the health state alarm threshold.
As can be seen from the air duct health threshold curve in FIG. 4, the larger the output power is, the larger the relative temperature value of the photovoltaic inverter is, the more obvious the fault characteristics are, and the alarm judgment is made by using the relative module temperature in the high output power interval, so that the missing report or the false report is not easy to occur. In a possible implementation manner, when the wind channel health detection of the photovoltaic inverter is performed, the health threshold curve is preset in the data collector, and different health threshold curves can be loaded through the sensitivity setting of the upper computer to makeFor one example, when sub-health is the health status alarm threshold, then sub-health threshold curve t is loaded 1 。
S202: an output power interval for detection is determined from the output power of the photovoltaic inverter.
In one possible embodiment, the output power interval for detection may be determined from the maximum power value and the preset number of output powers of the photovoltaic inverter.
Since the period of data storage is T every day, each period stores a piece of historical data, and the period is from operation to shutdown of the inverter, and the DC voltage is automatically detected once after the DC voltage is lower than the starting voltage. In one possible implementation, the historical data of the current day of detection may be ranked from small to large according to power, and the ranked output power may be obtained, so that the maximum power value in the output power may be determined.
In one possible implementation manner, the preset number may be M, and the output power interval of the photovoltaic inverter may be determined by selecting M number of power values downwards from the sequenced output power according to the maximum power value.
S203: and obtaining a first relative temperature corresponding to the output power according to the output power of the photovoltaic inverter.
The relative temperature is a temperature obtained by performing difference according to the actual temperature of the photovoltaic inverter and the temperature of the air inlet of the air duct, and when the actual output power of the photovoltaic inverter is obtained, the actual temperature corresponding to the output power can be obtained, namely, the first relative temperature corresponding to the output power can be obtained.
In one possible implementation manner, the difference processing may be performed according to the actual temperature of the photovoltaic inverter corresponding to the output power and the temperature of the air inlet of the air duct of the photovoltaic inverter, so as to obtain the first relative temperature corresponding to the output power.
In one possible embodiment, the abscissa is the output power of the photovoltaic inverter, the ordinate is the relative temperature, and the first relative temperature corresponding to the output power can be determined by the coordinate system. According to the output power in the output power interval, a first relative temperature corresponding to the output power in the output power interval can be determined.
S204: and detecting the air duct of the photovoltaic inverter according to the output power interval, the first relative temperature, the preset cut-off power value of the photovoltaic inverter and the health state alarm threshold curve, and obtaining a detection result of the air duct of the photovoltaic inverter.
In one possible embodiment, the preset cut-off power value P of the photovoltaic inverter can be set according to the output power interval limit Detecting an air duct of the photovoltaic inverter according to a first relative temperature corresponding to output power in an output power interval and a health state alarm threshold curve, thereby obtaining a detection result of the air duct of the photovoltaic inverter, wherein a cut-off power value P is preset limit The health state alarm threshold curve below the power value does not participate in the health detection of the air duct, and the cut-off power value P is preset limit Is fixed, and may be, as an example, fixed 50%, and of course, the preset cut-off power value is not specifically limited in this application, and does not affect the implementation of the embodiments of this application.
In one possible embodiment, when the cut-off power value P is preset limit Less than the minimum power value P in the output power interval min And when the wind channel of the photovoltaic inverter is detected according to the first relative temperature and health state alarm threshold curve corresponding to the output power in the output power interval, and the obtained detection result is abnormal wind channel.
Referring to fig. 5, fig. 5 is a schematic diagram of an air duct detection process, in one possible embodiment, when the preset cut-off power value P limit Less than the minimum power value P in the output power interval min When the weather is clear, the health detection of the air duct can be performed, and the quantity of the first relative temperature corresponding to the output power in the output power interval exceeding the health state alarm threshold curve, namely the maximum power value P, is counted max To the minimum power value P in the output power interval min Alarm threshold curve t in health state in M points in between 1 The number of points above. When the first relative temperature corresponding to the output power in the output power interval exceeds the health state alarm threshold curveWhen the number of the wires is larger than the preset number, the obtained detection result is that the air duct is abnormal. As an example, when the number of the first relative temperatures corresponding to the output power in the output power interval exceeds 80% of the health status alarm threshold curves, the detection result is that the air duct is abnormal, that is, 80% of the M points are at t 1 And (3) the upper part of the curve, and the detection result is that the air duct is abnormal. The air duct abnormality alarm can be carried out according to the detection result, and the power station operation and maintenance personnel can be notified before the failure and shutdown of the inverter, so that the power station operation and maintenance personnel can overhaul in time, the intelligent operation and maintenance level of the power station is improved, and the continuous operation capability of the inverter is enhanced.
In one possible embodiment, when the cut-off power value P is preset limit Greater than the maximum power value P max When the air duct health detection method is used, the condition that the illumination is weak on the same day is indicated, the health detection of the air duct is not carried out, and the health state alarm threshold curve can be obtained again so as to carry out the health detection of the air duct at the next time; when presetting the cut-off power value P limit Greater than the minimum power value P in the output power interval min And presets the cut-off power value P limit Less than the maximum power value P max And when the weather is cloudy on the same day, the health detection of the air duct is not performed, and the health state alarm threshold curve can be acquired again so as to perform the health detection of the air duct at the next time.
In addition, the detection result may be sent to the server by a communication method, and as an example, the detection result may be sent to the server by a serial communication protocol Modbus or a communication protocol IEC 104. The communication manner is not particularly limited, and implementation of the embodiments of the present application is not affected. Of course, the embodiment of the application can also be applied to centralized, serial, household and other inverter products, and the embodiment of the application is not particularly limited to the type of the inverter products and does not affect the implementation of the embodiment of the application.
The above is an air duct health detection method of a photovoltaic inverter provided in the embodiments of the present application, firstly, a health state alarm threshold curve of an air duct is obtained, and an output power interval for detection is determined according to the output power of the photovoltaic inverter. Then, according to the output power of the photovoltaic inverter, a first relative temperature corresponding to the output power is obtained. And finally, detecting the air duct of the photovoltaic inverter according to the output power interval, the first relative temperature corresponding to the output power, the preset cut-off power value of the photovoltaic inverter and the health state alarm threshold curve, and obtaining a detection result of the air duct of the photovoltaic inverter. Therefore, according to the output power interval of the photovoltaic inverter, the first relative temperature corresponding to the output power, the preset cut-off power value and the health state alarm threshold curve, the air duct of the photovoltaic inverter can be detected, the detection result of the air duct of the photovoltaic inverter is obtained, the air duct of the photovoltaic inverter can be rapidly and simply detected without a worker going to check the air duct on site, the continuous operation capability of the photovoltaic inverter is enhanced, and the operation and maintenance level of a power station is improved.
The embodiments of the present application provide some specific implementations of the method for detecting the health of an air duct of a photovoltaic inverter, and based on this, the present application further provides a corresponding device. The apparatus provided in the embodiments of the present application will be described from the viewpoint of functional modularization.
Referring to fig. 6, the schematic structural diagram of an air duct health detection device 600 of a photovoltaic inverter provided in the embodiment of the present application, the device 600 may include:
an acquisition module 601, configured to acquire a health status alarm threshold curve of an air duct;
a determining module 602, configured to determine an output power interval for detection according to an output power of the photovoltaic inverter;
an obtaining module 603, configured to obtain a first relative temperature corresponding to the output power according to the output power of the photovoltaic inverter;
the detection module 604 is configured to detect an air duct of the photovoltaic inverter according to the output power interval, the first relative temperature, the preset cut-off power value of the photovoltaic inverter, and the health status alarm threshold curve, and obtain a detection result of the air duct of the photovoltaic inverter.
In this embodiment of the present application, by matching the acquisition module 601, the determination module 602, the acquisition module 603 and the detection module 604, according to the output power interval of the photovoltaic inverter, the first relative temperature corresponding to the output power, the preset cut-off power value and the health state alarm threshold curve, the wind channel of the photovoltaic inverter can be detected, and the detection result of the wind channel of the photovoltaic inverter is obtained.
As one embodiment, the determining step of the health status alarm threshold curve includes:
the first determining unit is used for obtaining the health state of the air duct of the photovoltaic inverter according to the blocking area of the air duct of the photovoltaic inverter and determining a health state alarm threshold;
the first acquisition unit is used for carrying out difference processing according to the temperature value of the photovoltaic inverter and the temperature value of the air inlet of the air duct of the photovoltaic inverter to acquire a second relative temperature;
the first obtaining unit is used for obtaining a health threshold curve corresponding to the health state of the air duct of the photovoltaic inverter according to the second relative temperature, the health state of the air duct of the photovoltaic inverter and the output power of the photovoltaic inverter;
and the second determining unit is used for determining a health state alarm threshold curve according to the health state threshold curve corresponding to the health state of the air duct of the photovoltaic inverter and the health state alarm threshold.
As one embodiment, the health status of the wind tunnel of the photovoltaic inverter includes healthy, sub-healthy, unhealthy, ill, or faulty.
As an embodiment, the determining module 602 is specifically configured to:
and determining an output power interval for detection according to the maximum power value and the preset quantity in the output power of the photovoltaic inverter.
As one embodiment, the obtaining module 603 includes:
the second obtaining unit is used for obtaining a first relative temperature corresponding to the output power in the output power interval according to the output power in the output power interval;
correspondingly, the detection module 604 includes:
the detection unit is used for detecting the air duct of the photovoltaic inverter according to the output power interval, the first relative temperature corresponding to the output power in the output power interval, the preset cut-off power and the health state alarm threshold curve, and obtaining the detection result of the air duct of the photovoltaic inverter.
As an embodiment, the detection module 604 is specifically configured to:
and when the preset cut-off power value is smaller than the minimum power value in the output power interval, detecting the air duct of the photovoltaic inverter according to a first relative temperature and health state alarm threshold curve corresponding to the output power in the output power interval, and obtaining an abnormal detection result of the air duct.
As one embodiment, the detection module 604 includes:
the statistics unit is used for counting the quantity of the first relative temperature corresponding to the output power in the output power interval exceeding the health state alarm threshold curve when the preset cut-off power value is smaller than the minimum power value in the output power interval;
and the third obtaining unit is used for obtaining the detection result as the abnormal air duct when the number is larger than the preset number.
As an embodiment, the wind channel health detection device 600 of the photovoltaic inverter further includes:
and the alarm unit is used for carrying out air duct abnormality alarm according to the detection result.
As an embodiment, the wind channel health detection device 600 of the photovoltaic inverter further includes:
the second acquisition unit is used for re-acquiring a health state alarm threshold curve when the preset cut-off power value is larger than the maximum power value;
and the third acquisition unit is used for re-acquiring the health state alarm threshold curve when the preset cut-off power value is larger than the minimum power value in the output power interval and smaller than the maximum power value.
As an embodiment, the wind channel health detection device 600 of the photovoltaic inverter further includes:
and the sending unit is used for sending the detection result to the server through a communication mode.
The embodiment of the application also provides corresponding equipment and a computer storage medium, which are used for realizing the scheme provided by the embodiment of the application.
The device comprises a memory and a processor, wherein the memory is used for storing a computer program, and the processor is used for executing the computer program so that the device can execute the wind channel health detection method of the photovoltaic inverter.
The computer storage medium stores a computer program, and when the codes are executed, equipment running the computer program realizes the wind channel health detection method of the photovoltaic inverter.
The "first" and "second" in the names of "first", "second" (where present) and the like in the embodiments of the present application are used for name identification only, and do not represent the first and second in sequence.
From the above description of embodiments, it will be apparent to those skilled in the art that all or part of the steps of the above described example methods may be implemented in software plus general hardware platforms. Based on such understanding, the technical solutions of the present application may be embodied in the form of a software product, which may be stored in a storage medium, such as a read-only memory (ROM)/RAM, a magnetic disk, an optical disk, or the like, including several instructions for causing a computer device (which may be a personal computer, a server, or a network communication device such as a router) to perform the methods described in the embodiments or some parts of the embodiments of the present application.
It should be noted that, in the present specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment is mainly described in a different point from other embodiments. In particular, for the device embodiments, since they are substantially similar to the method embodiments, the description is relatively simple, and reference is made to the description of the method embodiments for relevant points. The apparatus embodiments described above are merely illustrative, wherein elements illustrated as separate elements may or may not be physically separate, and elements illustrated as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
The foregoing is merely one specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (13)

1. The method for detecting the health of the air duct of the photovoltaic inverter is characterized by comprising the following steps of:
acquiring a health state alarm threshold curve of the air duct;
determining an output power interval for detection according to the output power of the photovoltaic inverter;
obtaining a first relative temperature corresponding to the output power according to the output power of the photovoltaic inverter;
and detecting the air duct of the photovoltaic inverter according to the output power interval, the first relative temperature, the preset cut-off power value of the photovoltaic inverter and the health state alarm threshold curve to obtain a detection result of the air duct of the photovoltaic inverter.
2. The method of claim 1, wherein the step of determining the health status alert threshold curve comprises:
acquiring the health state of the air duct of the photovoltaic inverter according to the blocking area of the air duct of the photovoltaic inverter, and determining the health state alarm threshold;
performing difference solving processing according to the temperature value of the photovoltaic inverter and the temperature value of the air inlet of the air duct of the photovoltaic inverter to obtain a second relative temperature;
obtaining a health threshold curve corresponding to the health state of the air duct of the photovoltaic inverter according to the second relative temperature, the health state of the air duct of the photovoltaic inverter and the output power of the photovoltaic inverter;
and determining the health state alarm threshold curve according to the health state curve corresponding to the health state of the air duct of the photovoltaic inverter and the health state alarm threshold.
3. The method of claim 2, wherein the health status of the wind tunnel of the photovoltaic inverter comprises healthy, sub-healthy, unhealthy, ill, or faulty.
4. The method of claim 1, wherein the determining an output power interval for detection from the output power of the photovoltaic inverter comprises:
and determining the output power interval for detection according to the maximum power value and the preset number in the output power of the photovoltaic inverter.
5. The method according to claim 1, wherein obtaining a first relative temperature corresponding to the output power according to the output power of the photovoltaic inverter comprises:
obtaining a first relative temperature corresponding to the output power in the output power interval according to the output power in the output power interval;
detecting the air duct of the photovoltaic inverter according to the output power interval, the first relative temperature, the preset cut-off power value of the photovoltaic inverter and the health state alarm threshold curve to obtain a detection result of the air duct of the photovoltaic inverter, wherein the detection result comprises the following steps:
and detecting the air duct of the photovoltaic inverter according to the output power interval, the first relative temperature corresponding to the output power in the output power interval, the preset cut-off power and the health state alarm threshold curve, and obtaining a detection result of the air duct of the photovoltaic inverter.
6. The method according to claim 5, wherein detecting the wind channel of the photovoltaic inverter according to the output power interval, the first relative temperature corresponding to the output power in the output power interval, the preset cut-off power, and the health status alarm threshold curve, to obtain a detection result of the wind channel of the photovoltaic inverter includes:
and when the preset cut-off power value is smaller than the minimum power value in the output power interval, detecting an air duct of the photovoltaic inverter according to the first relative temperature corresponding to the output power in the output power interval and the health state alarm threshold curve, and obtaining an air duct abnormality as a detection result.
7. The method according to claim 6, wherein when the preset cut-off power value is smaller than the minimum power value in the output power interval, detecting an air duct of the photovoltaic inverter according to the sum of the first relative temperatures corresponding to the output power in the output power interval and the health status alarm threshold curve, and obtaining the detection result as an abnormal air duct, includes:
when the preset cut-off power value is smaller than the minimum power value in the output power interval, counting the number that the first relative temperature corresponding to the output power in the output power interval exceeds the health state alarm threshold curve;
and when the number is greater than the preset number, obtaining the detection result as the abnormal air duct.
8. The method of claim 7, wherein when the number is greater than a preset number, after obtaining the detection result as the air duct abnormality, further comprising:
and carrying out air duct abnormality alarm according to the detection result.
9. The method according to any one of claims 4 to 8, further comprising:
when the preset cut-off power value is larger than the maximum power value, the health state alarm threshold curve is acquired again;
and when the preset cut-off power value is larger than the minimum power value in the output power interval and the preset cut-off power value is smaller than the maximum power value, the health state alarm threshold curve is re-acquired.
10. The method according to claim 1, characterized in that the method further comprises:
and sending the detection result to a server in a communication mode.
11. An air duct health detection device of a photovoltaic inverter, the device comprising:
the acquisition module is used for acquiring a health state alarm threshold curve of the air duct;
the determining module is used for determining an output power interval for detection according to the output power of the photovoltaic inverter;
the obtaining module is used for obtaining a first relative temperature corresponding to the output power according to the output power of the photovoltaic inverter;
the detection module is used for detecting the air duct of the photovoltaic inverter according to the output power interval, the first relative temperature, the preset cut-off power value of the photovoltaic inverter and the health state alarm threshold curve, and obtaining a detection result of the air duct of the photovoltaic inverter.
12. An air duct health detection apparatus of a photovoltaic inverter, the apparatus comprising:
a memory for storing a computer program;
a processor for executing the computer program to cause the apparatus to perform the steps of the wind channel health detection method of a photovoltaic inverter as claimed in any one of claims 1 to 10.
13. A computer readable storage medium, characterized in that the computer readable storage medium has stored therein a computer program which, when executed by a processor, implements the steps of the wind channel health detection method of a photovoltaic inverter according to any one of claims 1 to 10.
CN202310139055.XA 2023-02-10 2023-02-10 Wind channel health detection method and device for photovoltaic inverter Pending CN116136556A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310139055.XA CN116136556A (en) 2023-02-10 2023-02-10 Wind channel health detection method and device for photovoltaic inverter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310139055.XA CN116136556A (en) 2023-02-10 2023-02-10 Wind channel health detection method and device for photovoltaic inverter

Publications (1)

Publication Number Publication Date
CN116136556A true CN116136556A (en) 2023-05-19

Family

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Family Applications (1)

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Country Status (1)

Country Link
CN (1) CN116136556A (en)

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