KR20180080599A - Apparatus and method for monitoring photovoltaic panels - Google Patents
Apparatus and method for monitoring photovoltaic panels Download PDFInfo
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- KR20180080599A KR20180080599A KR1020170001476A KR20170001476A KR20180080599A KR 20180080599 A KR20180080599 A KR 20180080599A KR 1020170001476 A KR1020170001476 A KR 1020170001476A KR 20170001476 A KR20170001476 A KR 20170001476A KR 20180080599 A KR20180080599 A KR 20180080599A
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- solar
- solar panel
- solar panels
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title abstract description 23
- 238000012545 processing Methods 0.000 claims abstract description 28
- 238000004891 communication Methods 0.000 claims abstract description 21
- 238000013480 data collection Methods 0.000 claims description 5
- 230000006870 function Effects 0.000 description 15
- 238000010248 power generation Methods 0.000 description 15
- 238000010586 diagram Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000012806 monitoring device Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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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
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
-
- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C19/00—Electric signal transmission systems
- G08C19/02—Electric signal transmission systems in which the signal transmitted is magnitude of current or voltage
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
- H01L31/042—PV modules or arrays of single PV cells
- H01L31/05—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S50/00—Monitoring or testing of PV systems, e.g. load balancing or fault identification
- H02S50/10—Testing of PV devices, e.g. of PV modules or single PV cells
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Photovoltaic Devices (AREA)
Abstract
A solar panel monitoring apparatus and method are disclosed. A solar panel monitoring apparatus according to an embodiment of the present invention includes a voltage measuring unit for measuring individual voltage values of a plurality of solar panels connected in series; A current measuring unit for measuring a common current value flowing through the plurality of solar panels connected in series; A central processing unit for digitally converting the individual voltage values and the common current value, and a communication unit for transmitting the digitally converted individual voltage values and the common current value to the data collecting apparatus.
Description
BACKGROUND OF THE
Among the power generation systems using renewable energy, the solar power generation system is a power generation system that converts solar energy into electricity. Solar cells that convert sunlight energy into electrical energy are assembled into a single solar panel. A plurality of such solar panels are installed in combination to increase the amount of generated electricity. This electricity is converted to AC through the solar inverter and used.
Solar panels have deteriorated performance with deterioration over time. Or the degree of deterioration may vary from one solar panel to another due to various internal and external factors. Some of the multiple solar panels affect the overall power generation when the panel is severely degraded. Therefore, a technique for monitoring the status of the installed panels is needed.
The technology for monitoring the state of the PV system may vary depending on the monitoring scope. First, there is a technology to monitor the performance of the entire system. This technology monitors the performance status of the entire PV system by monitoring the input / output power of the PV inverter. This method does not know where the deterioration occurred in the individual solar panel, but can only observe the performance trend of the whole system. Secondly, it is a method to monitor by string connected in series in PV system. This method has an advantage that the performance degradation of a specific string can be recognized in a solar power generation system composed of a plurality of strings. Third, it is a method to monitor individual solar panels. This method can be used to monitor the performance trend of a particular panel by monitoring individual solar panels and help maintain the performance of the entire PV system through processes such as replacement or repair in the event of severe degradation.
Among the above three methods, the monitoring performance is the third best, but the monitoring cost is also the highest. Monitoring is costly because additional equipment is needed. Therefore, there is a need for a method that can reduce costs while using the third method.
Korean Patent No. 10-1354190 entitled " Power generation circuit control module for a photovoltaic module and a power generation amount monitoring system using the same, ", respectively, detects the power generation level value of each photovoltaic module separately and transmits it to a remote central management station Even when the power can not be generated due to the abnormality of the photovoltaic module, the manager of the remote site monitors the development status of each photovoltaic module in real time by using the generated power of the neighboring photovoltaic module Discloses a power module control module of a photovoltaic module and a power generation monitoring system for each photovoltaic module that can bypass the power generation circuit of the module when an abnormal photovoltaic module is generated and maintain the series circuit of the main cable.
The present invention aims to reduce the monitoring cost of a solar panel.
According to an aspect of the present invention, there is provided an apparatus for monitoring a solar panel, including: a voltage measuring unit for measuring individual voltage values of a plurality of solar panels connected in series; A current measuring unit for measuring a common current value flowing through the plurality of solar panels connected in series; A central processing unit for digitally converting the individual voltage values and the common current value, and a communication unit for transmitting the digitally converted individual voltage values and the common current value to the data collecting apparatus.
The present invention can monitor a plurality of solar panels with a single monitoring device, thereby realizing an individual solar panel monitoring system at low cost.
1 is a view illustrating a solar power generation system according to an embodiment of the present invention.
2 is a view illustrating a solar panel monitoring apparatus to which solar panels according to an embodiment of the present invention are connected.
3 is a block diagram of a solar panel monitoring apparatus according to an embodiment of the present invention.
4 is a detailed block diagram illustrating an example of the solar panel monitoring apparatus shown in FIG.
5 is a flowchart illustrating a method for monitoring a solar panel according to an exemplary embodiment of the present invention.
6 is a block diagram illustrating a computer system in accordance with an embodiment of the present invention.
The present invention will now be described in detail with reference to the accompanying drawings. Hereinafter, a repeated description, a known function that may obscure the gist of the present invention, and a detailed description of the configuration will be omitted. Embodiments of the present invention are provided to more fully describe the present invention to those skilled in the art. Accordingly, the shapes and sizes of the elements in the drawings and the like can be exaggerated for clarity.
Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.
Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.
1 is a view illustrating a solar power generation system according to an embodiment of the present invention.
1, a photovoltaic power generation system according to an embodiment of the present invention includes a plurality of
2 is a view illustrating a solar panel monitoring apparatus to which solar panels according to an embodiment of the present invention are connected.
Referring to FIG. 2, a solar
At this time, the solar
At this time, a wired or wireless communication means can be used for the communication function.
It can be seen that the dotted arrows shown in Fig. 2 show the current flow. The current flows into the negative (-) and flows to the positive (+).
3 is a block diagram of a solar panel monitoring apparatus according to an embodiment of the present invention. 4 is a detailed block diagram illustrating an example of the solar panel monitoring apparatus shown in FIG.
3 and 4, a solar
The input unit may receive power output from a plurality of
The output unit may output the combined power from the plurality of
The
As shown in FIGS. 3 and 4, the
The
In this case, the
For example, the
At this time, the
In this case, the
For example, if the maximum voltage of the solar panel is 45V, the voltage should be lowered to the range of the ADC input of the
At this time, the cathode (-) of the reference panel selected by the
The reason why the positive electrode (+) and the negative electrode (-) of PV1, PV3, PV3 and PV4 are simultaneously input to the
For example, based on PV1, the anode (+) of PV2, the anode (+) of PV3, and the anode (+) of PV4 have sequentially higher voltages. Depending on the rated capacity of the solar panel, the maximum voltage usually corresponds to 20 to 50 V for solar panels. If the solar panel maximum voltage is 45V, the positive (+) of PV4 has 180V compared to the negative (-) of PV1. Accordingly, it is preferable that the cathode (-) of the reference solar panel is used as a reference and the anode (+) of the remaining solar panel is input to the
That is, the
The
The current of the
The
In this case, the
At this time, the
The size of the shunt resistor can be several mΩ to tens of mΩ to reduce the power consumed. Larger or smaller sizes can be used, but a shunt resistor of the appropriate size can be selected to reduce the power dissipated in the shunt resistor itself because the current flowing through the solar panel is up to 10A. The power consumed by the shunt resistor according to the magnitude of the shunt resistor and the magnitude of the current follows the Ohm's law and can be expressed by Equation (1).
Where W is the consumed power, I is the flowing current, and R is the shunt resistance magnitude. For example, if the shunt resistor is 1 Ω, the power consumed is 100 W, 0.1 W is 10 W, 10 MΩ is 1 W, and 1 mΩ is 0.1 W.
If the size of the shunt resistor is too small, the voltage sensed across the shunt resistor may be too low to be converted into a current, so it should be adjusted accordingly. In the case of 10 mΩ, which is one of the examples mentioned above, the voltage between both ends when 10 A flows is 0.1 V. If the amount of current is reduced due to insufficient solar radiation, the voltage will be lower. This voltage is difficult to detect through the ADC in the
The
For example, the
At this time, the
At this time, the
The
At this time, the
At this time, the
For example, the wired communication function can correspond to RS-232, RS-485, RS-422, Ethernet, USB, etc. and the wireless communication function is compatible with Wi-Fi, ZigBee, Z- Bluetooth, UWB, LTE, 3G / 4G, and the like.
5 is a flowchart illustrating a method for monitoring a solar panel according to an exemplary embodiment of the present invention.
Referring to FIG. 5, the solar panel monitoring method according to an embodiment of the present invention can measure current and voltage (S210).
That is, step S210 may measure the individual voltage values of the plurality of
Step S210 can select a reference panel to be used as a reference among the four solar panels when measuring the voltage.
In this case, in step S210, the relative voltage may be measured based on the negative (-) of the reference panel, and the voltages of the remaining panels may be calculated through mathematical subtraction.
For example, in step S210, a voltage at a point connected to the positive (+) terminal of PV1 is referred to as V1, a voltage at a point connected to the positive (+) terminal of PV2 is referred to as V2, +) Is V3, and the voltage at the point connected to the positive (+) of PV4 is V4.
At this time, step S210 may use a voltage divider to lower the voltage to the range where V1, V2, V3 and V4 can be measured, and to measure the voltage in the ADC possible range.
For example, if the maximum voltage of the solar panel is 45V, the voltage should be lowered to the range of the ADC input of the
For example, based on PV1, the anode (+) of PV2, the anode (+) of PV3, and the anode (+) of PV4 have sequentially higher voltages. Depending on the rated capacity of the solar panel, the maximum voltage usually corresponds to 20 to 50 V for solar panels. If the solar panel maximum voltage is 45V, the positive (+) of PV4 has 180V compared to the negative (-) of PV1. Accordingly, it is preferable that the cathode (-) of the reference solar panel is used as a reference and the anode (+) of the remaining solar panel is input to the
In addition, the step S210 may measure a common current value flowing through the plurality of
The current of the
At this time, the step S210 may be connected to the cathode (-) of PV1 to measure the current.
In this case, in step S210, the voltage formed using the shunt resistor may be measured through an ADC (analog-to-digital), and the voltage formed using a CT (current transformer) may be measured through the ADC .
At this time, the
The size of the shunt resistor can be several mΩ to tens of mΩ to reduce the power consumed. Larger or smaller sizes can be used, but a shunt resistor of the appropriate size can be selected to reduce the power dissipated in the shunt resistor itself because the current flowing through the solar panel is up to 10A. The power consumed by the shunt resistor according to the magnitude of the shunt resistor and the magnitude of the current follows the Ohm's law and can be expressed by Equation (1).
If the size of the shunt resistor is too small, the voltage sensed across the shunt resistor may be too low to be converted into a current, so it should be adjusted accordingly.
In addition, the solar panel monitoring method according to an embodiment of the present invention can process data (S220).
That is, step S220 may digitally convert the individual voltage values and the common current value.
For example, step S220 may perform an analog-to-digital (ADC) function of converting an analog signal obtained by measuring the individual voltage values and the common current value into a digital signal.
At this time, after the V1, V2, V3 and V4 are converted into digital values by the ADC, the voltage of PV1 is V1, the voltage of PV2 is V2-V1, the voltage of PV3 is V3-V2, The voltage of PV4 can be calculated by V4-V3.
In addition, the solar panel monitoring method according to an embodiment of the present invention can transmit data (S230).
That is, the step S230 may transmit the digitally converted discrete voltage values and the common current value to the data collection device.
At this time, step S230 may transmit the measurement result to the data collection device via the wired or wireless communication interface.
At this time, step S230 may perform all other possible communication functions such as a wired communication function or a wireless communication function.
For example, the wired communication function can correspond to RS-232, RS-485, RS-422, Ethernet, USB, etc. and the wireless communication function is compatible with Wi-Fi, ZigBee, Z- Bluetooth, UWB, LTE, 3G / 4G, and the like.
6 is a block diagram illustrating a computer system in accordance with an embodiment of the present invention.
Referring to FIG. 6, embodiments of the present invention may be implemented in a
As described above, the apparatus and method for monitoring the solar panel according to the present invention are not limited to the configurations and the methods of the embodiments described above, but the embodiments can be applied to various embodiments All or a part of the above-described elements may be selectively combined.
10: Solar panel 20: Connection box
30: solar inverter 100: solar panel monitoring device
110: voltage measuring unit 120: current measuring unit
130: central processing unit 140:
1100: Computer system 1110: Processor
1120: bus 1130: memory
1131: ROM 1132: RAM
1140: User interface input device
1150: User interface output device
1160: Storage 1170: Network Interface
1180: Network
Claims (1)
A current measuring unit for measuring a common current value flowing through the plurality of solar panels connected in series;
A central processing unit for digitally converting the individual voltage values and the common current value; And
A communication unit for transmitting the digitally converted individual voltage values and the common current value to the data collection device;
And a monitoring unit for monitoring the solar panel.
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| Application Number | Priority Date | Filing Date | Title |
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| KR1020170001476A KR20180080599A (en) | 2017-01-04 | 2017-01-04 | Apparatus and method for monitoring photovoltaic panels |
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| Application Number | Priority Date | Filing Date | Title |
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| KR1020170001476A KR20180080599A (en) | 2017-01-04 | 2017-01-04 | Apparatus and method for monitoring photovoltaic panels |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20200104038A (en) | 2019-02-26 | 2020-09-03 | 한빛이디에스(주) | Apparatus for guiding a replacement of solarcell module based on reliability |
| KR20210001007A (en) * | 2019-06-26 | 2021-01-06 | 주식회사 아미텍 | Smart solar connection board for photovoltaics system and monitoring method using the smae |
| KR20210067486A (en) * | 2019-11-29 | 2021-06-08 | 주식회사 보아스에스이 | System for monitoring photovoltaic cell |
| KR20210078781A (en) | 2019-12-19 | 2021-06-29 | 한빛이디에스(주) | Apparatus for guiding a maintenance of solarcell module based on big-data |
| KR20220064536A (en) | 2020-11-12 | 2022-05-19 | 한빛이디에스(주) | Integrated management device for solar power facilities |
| WO2023284290A1 (en) * | 2021-07-12 | 2023-01-19 | 中国华能集团清洁能源技术研究院有限公司 | Multi-dimensional tandem photovoltaic string data acquisition system and method |
-
2017
- 2017-01-04 KR KR1020170001476A patent/KR20180080599A/en unknown
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20200104038A (en) | 2019-02-26 | 2020-09-03 | 한빛이디에스(주) | Apparatus for guiding a replacement of solarcell module based on reliability |
| KR20210001007A (en) * | 2019-06-26 | 2021-01-06 | 주식회사 아미텍 | Smart solar connection board for photovoltaics system and monitoring method using the smae |
| KR20210067486A (en) * | 2019-11-29 | 2021-06-08 | 주식회사 보아스에스이 | System for monitoring photovoltaic cell |
| KR20210078781A (en) | 2019-12-19 | 2021-06-29 | 한빛이디에스(주) | Apparatus for guiding a maintenance of solarcell module based on big-data |
| KR20220064536A (en) | 2020-11-12 | 2022-05-19 | 한빛이디에스(주) | Integrated management device for solar power facilities |
| WO2023284290A1 (en) * | 2021-07-12 | 2023-01-19 | 中国华能集团清洁能源技术研究院有限公司 | Multi-dimensional tandem photovoltaic string data acquisition system and method |
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