KR102475833B1 - Abnormality Monitoring System of Solar Power Generation System - Google Patents

Abstract

A system for monitoring whether a solar power generation system is abnormal comprises: a solar array unit made of a plurality of solar arrays in which a plurality of solar modules are arranged in series; a plurality of current measuring units for individually measuring the amount of currents of each of the plurality of solar arrays; and a control unit configured to store a normal current amount range generated during a preset time for one of the plurality of solar arrays, control the plurality of current measuring units to allow each of the plurality of current measuring units to measure the amount of currents of each of the plurality of solar arrays during a preset time, and determine that a corresponding solar array is defective, wherein the corresponding solar array corresponds the amount of currents deviating from the normal current amount range among the plurality of measured amounts of currents.

Description

Abnormality Monitoring System of Solar Power Generation System}

The present invention relates to a system for monitoring an abnormality in a solar power generation system, and more particularly, to a system for monitoring an abnormality in a solar power generation system capable of detecting a defect in a solar power generation system.

A photovoltaic power generation system is a power generation facility that generates electricity using sunlight and stores the generated electricity in a storage device such as a capacitor using a plurality of arrays formed by connecting a plurality of photovoltaic modules or transmits the electricity to the KEPCO system. do. The manager measures the amount of current sequentially for each solar array in order to determine whether or not there is an abnormality in the plurality of arrays.

However, during photovoltaic power generation, there is a problem in that the amount of current measured according to the surrounding conditions, that is, the meteorological conditions at the time of measuring the amount of current, is so severe that precise measurement is impossible and the ability to discriminate whether or not there is an abnormality in the plurality of arrays is poor.

Accordingly, an object of the present invention is to provide a monitoring system for monitoring the presence or absence of an abnormality in a solar power generation system that can accurately determine whether or not there is an abnormality in a plurality of arrays regardless of the surrounding conditions or weather of the solar power generation system.

In order to achieve the above object, a monitoring system for an abnormality in a photovoltaic power generation system according to the present invention includes a photovoltaic array unit composed of a plurality of photovoltaic arrays in which a plurality of photovoltaic modules are arranged in series; a plurality of current measurement units each measuring an amount of current of each of the plurality of photovoltaic arrays; and stores a normal current amount range generated during a preset time for one of the plurality of photovoltaic arrays, wherein each of the plurality of current measuring units measures the amount of current of each of the plurality of photovoltaic arrays for the preset time. and a control unit which controls the plurality of current measurement units to measure and determines that a corresponding photovoltaic array corresponding to an amount of current outside the normal current amount range among the plurality of measured amounts of current is defective. By measuring the amount of current for the same period of time for a plurality of photovoltaic arrays and comparing it with the normal current amount range, it is judged that the array that is out of range is defective, so that it is possible to simply determine the defective array, so the speed and accuracy of the defective judgment can be improved.

Here, a camera for photographing one side of the plurality of photovoltaic modules is further included, and the controller stores a normal image of one side of the plurality of photovoltaic modules for each of a plurality of time periods, and the captured plurality of sunlight It is preferable that a cause of a defect in a solar array can be accurately identified by comparing an image of one side of a module with the normal image and determining a side of a contaminated photovoltaic module among one side of the plurality of photovoltaic modules.

Further, the control unit analyzes images of one surface of the plurality of photovoltaic modules photographed to calculate a contaminated area, and the ratio of the amount of current of the corresponding photovoltaic array corresponding to the amount of current outside the normal current amount range with respect to the normal current amount range When comparing the ratio of the calculated contaminated area to the total area of one side of the plurality of photovoltaic modules, it is preferable to determine the ratio of the cause of the defect using the calculated contaminated area ratio and current amount ratio.

Here, the cleaning unit may further include a cleaning unit capable of spraying at least one of washing water and air toward one surface of the plurality of solar modules, and the control unit may, when the corresponding solar array is determined to be defective, clean the plurality of solar modules. It is preferable to control the cleaning unit so that one side is cleaned, since it is possible to solve the cause of defects caused by contaminants.

According to the present invention, the amount of current for a plurality of solar arrays is measured for the same period of time, compared with the normal current amount range, and the array outside the range is determined to be defective, so that the defective array can be simply determined, so the speed and accuracy of the defective judgment is improved. There is an effect that can be.

1 is a schematic diagram of a system for monitoring an abnormality of a photovoltaic power generation system according to the present invention.
2 is a control block diagram of a monitoring system for abnormalities in a photovoltaic power generation system.

Hereinafter, a system 1 for monitoring the presence or absence of an abnormality in a photovoltaic power generation system according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic diagram of a system 1 for monitoring the presence or absence of an abnormality in a solar power generation system according to the present invention, and FIG. 2 is a control block diagram of the system 1 for monitoring the presence or absence of an abnormality in a solar power generation system.

Referring to FIGS. 1 and 2, a system 1 for monitoring the presence or absence of an abnormality in a photovoltaic power generation system will be described.

The system 1 for monitoring the presence or absence of abnormalities in the photovoltaic power generation system may include a photovoltaic array unit 10, a current measuring unit 20, a camera unit 30, a cleaning unit 40, and a control unit 50.

The photovoltaic array unit 10 includes a plurality of photovoltaic arrays 11 to 14 in which a plurality of photovoltaic modules are arranged in series. The plurality of photovoltaic arrays 11 to 14 may include a first photovoltaic array 11 , a second photovoltaic array 12 , a third photovoltaic array 13 and a fourth photovoltaic array 14 . . The first photovoltaic array 11, the second photovoltaic array 12, the third photovoltaic array 13, and the fourth photovoltaic array 14 may have the same configuration, and the first photovoltaic array 11 ) is composed of a first photovoltaic module 111, a first photovoltaic module 112, a third photovoltaic module 113, a fourth photovoltaic module 114, and an nth photovoltaic module (n). can

The first photovoltaic module 111, the first photovoltaic module 112, the third photovoltaic module 113, the fourth photovoltaic module 114, and the nth photovoltaic module n receive sunlight to generate electricity. can produce energy. The generated electrical energy can be transmitted to the inverter 3 through the solar junction panel 2 .

The first photovoltaic array 11 includes a first photovoltaic module 111, a first photovoltaic module 112, a third photovoltaic module 113, a fourth photovoltaic module 114, and an n-th photovoltaic module. (n) electrically connected.

The current measuring unit 20 is connected to the rear end of each of the first photovoltaic array 11, the second photovoltaic array 12, the third photovoltaic array 13, and the fourth photovoltaic array 14, i.e., solar connection. It is disposed between the half (2) and the first photovoltaic array 11, the second photovoltaic array 12, the third photovoltaic array 13, and the fourth photovoltaic array 14, respectively, to measure each current. can do. The current measuring unit 20 starts measuring at the same time under the control of the control unit 50 to be described later, measures the amount of current produced in the entire arrays 11 to 14 for a preset time, and transfers it to the control unit 50.

The camera unit 30 may photograph one side of a plurality of photovoltaic modules. The camera unit 30 may photograph one surface of a plurality of solar modules receiving sunlight.

The cleaning unit 40 may spray at least one of washing water and air toward one surface of the plurality of solar modules. In addition to washing one surface of the plurality of solar modules by spraying washing water, the cleaning unit 40 separates contaminants from one surface of the plurality of solar modules using a brush and then removes the air from one surface of the plurality of solar modules. It is also possible to remove contaminants from one surface of a plurality of photovoltaic modules by spraying.

The cleaning unit 40 includes a spray nozzle 41 for spraying washing water, a washing water supply unit 42 for supplying washing water to the spray nozzle 41, and a nozzle rotation driving unit 43 for rotating the spraying direction of the spray nozzle. can include

The control unit 50 stores a normal current amount range generated during a preset time for one of the plurality of photovoltaic arrays 11 to 14, and each of the plurality of current measurement units 21 to 24 stores a preset amount of current. The plurality of current measurement units 21 to 24 are controlled to measure the amount of current of each of the plurality of photovoltaic arrays 11 to 14 during the time, and the corresponding sunlight corresponding to the amount of current outside the normal current amount range among the measured amount of current The array can be judged to be bad.

The control unit 50 stores normal images of one side of a plurality of photovoltaic modules for a plurality of time periods, and compares the images of one side of a plurality of photovoltaic modules photographed with the normal images to determine contamination among one side of the plurality of photovoltaic modules. One side of the photovoltaic module can be judged. The control unit 50 may distinguish a contaminated part from an image of one surface of a plurality of solar modules. The control unit 50 may distinguish the contaminated part from the image of one side of the plurality of photovoltaic modules using color, texture, and histogram, and the image of one side of the plurality of photovoltaic modules photographed may be viewed at various angles. It is also possible to distinguish a contaminated area from a non-contaminated area by being photographed in the image.

The control unit 50 may compare the ratio of the current amount of the corresponding photovoltaic array corresponding to the amount of current outside the normal current amount range to the calculated contaminated area with respect to the total area of one surface of the plurality of photovoltaic modules.

The control unit 50 may calculate the contaminated area by analyzing images of one surface of a plurality of photovoltaic modules photographed. If the ratio of the contaminated area to the total area of one surface of the plurality of photovoltaic modules is within a predetermined deviation, it can be determined that the amount of current decreased due to contamination.

The control unit 50 may control the cleaning unit 40 to clean one surface of a plurality of solar modules when it is determined that the corresponding solar array is defective.

The control unit 50 may control the nozzle rotation driving unit 43 so that the direction of the washing water sprayed from the spray nozzle 41 is directed toward the pollutants analyzed according to the image of one surface of the plurality of photovoltaic modules photographed.

Although the solar power generation system is installed in a sunny place with a lot of sunlight, if the current is sequentially measured for each array while the weather is changing, the difference in the amount of current can be large depending on the weather, so there is a possibility that the data is not reliable. Very large. In order to improve this, it is necessary to measure the amount of current of each array at the same time regardless of the weather, so that it is possible to determine whether there is an abnormality in each array regardless of the weather.

The photovoltaic connecting board 2 may be included in the monitoring system 1 for abnormality of the photovoltaic power generation system.

The solar connection board 2 includes an input terminal 210, an input voltage measurement unit 220, an output terminal 230, a ground terminal 240, a switching unit 250, a regulator 260, a cooling unit ( 270), a sensor unit 280, and a connection panel control unit 290. The solar connection board 2 includes an input terminal unit 210, an input voltage measurement unit 220, an output terminal unit 230, a ground terminal unit 240, a switching unit 250, a regulator 260, a cooling unit 270 , A housing (not shown) capable of accommodating the sensor unit 280 and the connection panel control unit 290 may be further included.

The input terminal unit 210 is electrically connected to a plurality of photovoltaic modules so that current generated from the plurality of photovoltaic modules is input.

The input voltage measurement unit 220 may measure the voltage of current input to the input terminal unit 210 . The input voltage measurement unit 220 may transmit the measured voltage of the input terminal unit 210 to the connection board control unit 290 to be described later.

The output terminal unit 230 is electrically connected to the inverter 3 so that the current input through the input terminal unit 210 can be output to the inverter 3 at a later stage.

The ground terminal unit 240 may externally ground current input between the input terminal unit 210 and the output terminal unit 230 .

The switching unit 250 is disposed between the input terminal unit 210 and the output terminal unit 230, and connects the input terminal unit 210 to any one of the output terminal unit 230, the regulator 260 and the ground terminal unit 240 to be described later. can be made Here, the ground terminal unit 240 may be connected to the regulator 260 or may be directly connected to the switching unit 250 .

The regulator 260 may be disposed between the input terminal unit 210 and the ground terminal unit 240 so that a voltage input to the input terminal unit 210 is adjusted and output to the output terminal unit 230 at a constant level. The regulator 260 can output a constant voltage set to the output terminal 230, and even when an overvoltage is input from the input terminal 210 or a low voltage is input, the regulator 260 reduces and boosts the voltage so that a constant voltage is generated at the output terminal. (230).

The cooling unit 270 may output cold air toward the input terminal unit 210 , the output terminal unit 230 , the switching unit 250 and the regulator 260 . The cooling unit 270 may include a cooling element 271 and a blower 272 .

The cooling element 271 is composed of a plurality of thermoelectric elements. A thermoelectric element is a generic term for elements using various effects resulting from interactions between heat and electricity. There are thermistors used for circuit stabilization and heat, power, and light detection, devices using the Seebeck effect used for temperature measurement, and Peltier devices used for refrigerators and thermostats. Here, the Peltier effect is a phenomenon in which when two types of metal ends are connected and a current flows there, one terminal absorbs heat and the other terminal generates heat, depending on the direction of the current. By using semiconductors such as bismuth and tellurium that have different electrical conduction methods instead of the two types of metals, a Peltier element with highly efficient heat absorption and heat generation can be obtained.

It is possible to switch between heat absorption and heat generation according to the direction of current and adjusts the amount of heat absorption and heat generation according to the amount of current, so it is applied to the manufacture of refrigerators with low capacity or precise thermostats near room temperature. The Peltier element causes exothermic and endothermic reactions by using N-type and P-type semiconductors once to show the Peltier effect. As described above, the thermoelectric element of the cooling unit 271 may be formed with both the heat absorbing part and the heat absorbing part, or may be formed with only the heat absorbing part.

The cooling element 271 may be disposed at the front end of the blower 272, which will be described later, disposed toward the input terminal unit 210, the output terminal unit 230, the switching unit 250, and the regulator 260, that is, on the blowing direction side. .

The blower 272 is disposed to blow toward the cooling element 271 so that the blown air can flow to the input terminal unit 210 , the output terminal unit 230 , the switching unit 250 and the regulator 260 .

The sensor unit 280 may detect heat and an image of at least one of the input terminal unit 210 , the output terminal unit 230 , the switching unit 250 and the regulator 260 . The sensor unit 280 may include an image sensor 281 , a heat sensor 282 and an external temperature sensor 283 .

The image detection sensor 281 may be provided as a thermal imaging camera, and may detect and capture an internal image. The image detection sensor 81 may capture a thermal image of at least one of the input terminal unit 210 , the output terminal unit 230 , the switching unit 250 and the regulator 260 . The image detection sensor 81 can capture an image even if a fire occurs, and can capture a thermal image even if the temperature of the input terminal 210, the output terminal 230, the switching unit 250, and the regulator 260 rises. can

The thermal sensor 282 may detect heat emitted from the input terminal unit 210 , the output terminal unit 230 , the switching unit 250 and the regulator 260 .

The external temperature sensor 283 may detect the temperature of the outside of the housing.

The connection panel control unit 290 stores the normal voltage range input to the input terminal unit 210, and when the voltage measured by the input voltage measuring unit 220 is out of the normal voltage range, the input terminal unit 210 and the regulator 260 It is possible to control the switching unit 250 so that is connected. The control unit 290 switches the input voltage so that it is not output to the output terminal unit 230 when the voltage input to the input terminal unit 210 is overvoltage or undervoltage outside the normal voltage range, so that the input voltage is input to the regulator 260. can The connection board control unit 290 may further have an internal switch that allows the excess current to be connected to ground when a current greater than the capacity of the regulator 260 is input.

The connection panel control unit 290 stores the normal temperature range and normal image range of each of the input terminal unit 210, the output terminal unit 230, the switching unit 250, and the regulator 260, and the sensor unit 280 detects the The risk of fire can be determined according to the temperature of the input terminal unit 210, the output terminal unit 230, the switching unit 250, and the regulator 260, and the extent to which the burns deviate from the normal temperature range and the normal burn range.

The connection panel control unit 290 may provide a plurality of fire risk steps. The connection panel control unit 90 may determine the risk of fire by dividing the heat dissipation temperature detected by the heat sensor 282 into a plurality of ranges, and divides the image detected by the image sensor 281 into a plurality of ranges. This can be used to determine the fire risk. For example, if fire possibility 1 is determined by dividing into fire possibility 1, fire possibility 2, and fire possibility 3, cold air step 1 is input terminal unit 210, output terminal unit 230, switching unit 250, and regulator 260 ), the cooling unit 270 may be controlled to be output. The connection panel control unit 290 may output the first, second, and third stages of cold air according to the output strength of the cold air.

The connection panel control unit 290 controls the input terminal unit when the temperature of each of the input terminal unit 210, the output terminal unit 230, the switching unit 250, and the regulator 260 detected by the sensor unit 280 exceeds the normal temperature range ( 210), the output terminal unit 230, the switching unit 250, and the regulator 260, the cooling unit 270 may be controlled so that cold air is output toward at least one that exceeds the normal temperature range.

The connection panel control unit 290 controls the cooling temperature of the cooling element 271 according to the respective temperatures of the input terminal unit 210, the output terminal unit 230, the switching unit 250, and the regulator 260 detected by the sensor unit 280. can control. In addition, the connection panel control unit 290 rotates the blower 272 according to the respective temperatures of the input terminal unit 210, the output terminal unit 230, the switching unit 250, and the regulator 260 detected by the sensor unit 280. It is also possible to control the air flow rate by controlling the speed.

The connection board controller 290 may control the cooling temperature of the cooling element 271 according to the temperature of the external temperature sensor 283 . In addition, the connection board control unit 290 may control the rotational speed of the blower 272 according to the temperature of the external temperature sensor 283 so that the amount of air blowing may be controlled. The connection panel control unit 290 lowers the normal temperature range and normal image range of each of the input terminal unit 210, the output terminal unit 230, the switching unit 250, and the regulator 260 when the external temperature is equal to or higher than the preset temperature. can be changed to Accordingly, even when temperatures of the input terminal unit 210, the output terminal unit 230, the switching unit 250, and the regulator 260 are low, the cooling unit 270 may be operated.

Modifiable embodiments other than the above embodiments will be described.

The washing water supply unit 42 may include a washing water pipe and a washing water pump installed on the washing water pipe to move and drive the washing water. The control unit 50 may change and control the intensity of the washing water pump according to the distance of the contaminant area, the degree of contamination of the contaminant, and the contamination thickness.

A rail allowing the injection nozzle 41 to slide along the longitudinal direction of the photovoltaic array may be installed. As a result, the control unit 50 may move the spray nozzle 41 so that the spray strength is such that the washing water can be separated and removed from the contaminants.

The cleaning unit 40 may include a washing water tank for storing washing water and a washing liquid tank for storing a washing liquid containing a surfactant component, and may control the washing liquid to be appropriately sprayed to contaminants together with the washing liquid.

Due to the monitoring system 1 for abnormality of the photovoltaic power generation system, the amount of current for a plurality of photovoltaic arrays is measured for the same period of time, compared with the normal current amount range, and the array outside the normal current amount is judged to be defective. Since it can be judged, the speed and accuracy of bad judgment can be improved.

1: Monitoring system for abnormality of solar power generation system
2: solar panel 3: inverter
10: solar array unit 11: first solar array
12: second solar array 13: third solar array
14: fourth solar array
20: current measuring unit 21: first current measuring unit
22: second current measuring unit 23: third current measuring unit
24: fourth current measuring unit
30: camera unit 31: first camera unit
32: second camera unit 33: third camera unit
34: fourth camera unit
40: cleaning unit 41: injection nozzle
42: washing water supply unit 43: nozzle rotation drive unit
50: control unit

Claims (5)

In the abnormality monitoring system of the solar power generation system,
A photovoltaic array unit composed of a plurality of photovoltaic arrays in which a plurality of photovoltaic modules are arranged in series;
a plurality of current measurement units each measuring an amount of current of each of the plurality of photovoltaic arrays; and
A normal current amount range generated during a preset time for one of the plurality of photovoltaic arrays is stored, and each of the plurality of current measuring units simultaneously measures the amount of current of each of the plurality of photovoltaic arrays. Controls the current measurement unit and includes a control unit for determining that the solar array corresponding to the current amount outside the normal current amount range among the plurality of current amounts measured at the same time is defective,
Further comprising a camera for photographing one side of the plurality of solar modules,
The control unit,
A normal image of one side of the plurality of photovoltaic modules is stored for a plurality of time periods, and an image of one side of the plurality of photovoltaic modules photographed by the camera is compared with the normal image, One side of the photovoltaic module that is polluted among one side is determined and the contaminated area is calculated,
A photovoltaic power generation system comparing the ratio of the current amount of the solar array corresponding to the amount of current outside the normal current amount range to the normal current amount range and the ratio of the calculated contaminated area to the total area of one surface of the plurality of photovoltaic modules. Abnormality monitoring system of
delete delete delete According to claim 1,
Further comprising a cleaning unit capable of spraying at least one of washing water and air toward one surface of the plurality of photovoltaic modules,
The control unit,
The solar power generation system monitoring system for controlling the cleaning unit to clean one surface of the plurality of solar modules when it is determined that the corresponding solar array is defective.

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