KR101465764B1 - Solar photovoltaic power generation system - Google Patents
Solar photovoltaic power generation system Download PDFInfo
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- KR101465764B1 KR101465764B1 KR1020130049127A KR20130049127A KR101465764B1 KR 101465764 B1 KR101465764 B1 KR 101465764B1 KR 1020130049127 A KR1020130049127 A KR 1020130049127A KR 20130049127 A KR20130049127 A KR 20130049127A KR 101465764 B1 KR101465764 B1 KR 101465764B1
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- 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
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- 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
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Abstract
The present invention relates to a photovoltaic power generation system having a monitoring function of a photovoltaic module in consideration of external environmental factors. A solar photovoltaic generation system according to a preferred embodiment of the present invention is a solar photovoltaic generation system having a solar photovoltaic module monitoring function considering external environmental factors, Wherein the diagnostic unit determines whether the voltage value of the solar module to be diagnosed included in the solar array is less than or equal to a first reference value and if the voltage value of the solar module to be diagnosed is equal to or less than the first reference value Determining whether the voltage value of the solar module to be diagnosed is equal to or less than the average value of the total solar array array and if the voltage value of the solar module to be diagnosed is less than the average value of the total solar array array, Judged that there is an abnormality in the optical module; And a reference value setting unit for setting the first reference value in consideration of external environmental factors.
Description
The present invention relates to a solar power generation system, and more particularly, to a solar power generation system having an external environment adaptive solar cell module monitoring function.
Photovoltaic power generation is a way to convert light energy from the sun directly into electrical energy. The solar power generation system has a clean and unlimited energy source, it can generate only the necessary amount in necessary places, it is easy to maintain and unmanned, it can be longevity more than 20 years, The photovoltaic power generation system is increasing in proportion to the total power generation.
At the core of this solar power generation is a solar cell with a pn junction structure. When a photon is absorbed from the outside into the inside of a solar cell, the energy of the photon causes a pair of electrons and holes . The generated electron-hole pairs are transferred to the n-type semiconductor by the electric field generated at the pn junction, and the holes are transferred to the p-type semiconductor and collected at the electrodes on the respective surfaces. The charge collected at each electrode is a source of energy that operates the load as a current flowing through the load when a load is connected to an external circuit.
The smallest unit of solar cell is called cell. Actually, the solar cell is rarely used as it is. The reason for this is two, one is that the voltage from one cell is very small, about 0.5V, and the voltage actually used is several tens or hundreds of volts or more from several volts, so that several cells or dozens of cells are connected in series You must do it. Another reason is that when used outdoors, it is subjected to various harsh environments, so it is necessary to protect the connected cells in a harsh environment. For this reason, a plurality of cells are referred to as solar modules. In addition, a plurality of these modules are suitably used for the purpose of use, which is called a solar array.
In the case of large-scale photovoltaic power generation, several hundreds or more solar arrays are installed. When operating such large-scale solar power generation, the voltage of a specific solar array is lowered (in other words, the efficiency of a specific array is lowered), the voltage of a specific solar module is lowered Can be reduced).
Such efficiency degradation can be caused by shade, contamination, or failure. In general, the solar power generation system is installed in a place where there is sufficient sunlight and space is sufficient. Therefore, it can be seen that the shade of the cause of the decrease in efficiency is caused by the cloud, and the contamination is caused by the accumulated dust on the entire surface of the solar array for a long time, and the failure is caused by the deterioration of the cell.
When the efficiency deterioration of the solar array exceeds the threshold value, it is necessary to separate the solar array from the system in order to prevent the defective power source from being supplied to the system.
In addition, the operator immediately recognizes the cause of the efficiency deterioration, and it is necessary to be able to take measures such as repair, replacement, and cleaning for the specific module in which the efficiency deteriorates.
However, in the past, there was no solar power generation system capable of monitoring the cause of the efficiency reduction by dividing it into shade, pollution, and failure.
Further, there was no solar power generation system capable of separating the solar array whose efficiency deterioration exceeded the threshold value from the system.
In addition, in a conventional solar power generation monitoring system, a ZigBee module for sensing a voltage for each of a plurality of solar modules is installed in order to individually monitor a plurality of solar modules disposed in the solar array. At this time, since the ZigBee module is installed as many as the number of solar modules, there is a problem that the monitoring system is expensive, the monitoring system is complicated, and a lot of manpower is consumed in the installation process.
In addition, the conventional solar power generation monitoring system does not diagnose the solar module in consideration of external environmental factors, for example, the amount of sunlight and the temperature of the solar module, and thus the solar module can not be accurately diagnosed.
Accordingly, it is an object of the present invention to provide a solar power generation system capable of separating a solar array from a system in order to prevent a bad power from being supplied to the system when the efficiency deterioration of the solar array exceeds a threshold value.
The present invention provides a photovoltaic power generation system capable of taking measures such as repair, replacement, and cleaning for a specific module in which the operator immediately recognizes the cause of the efficiency degradation of the photovoltaic module.
The present invention also provides a photovoltaic power generation system capable of monitoring the cause of the decrease in efficiency as shade, contamination, and failure.
In addition, the present invention provides a solar power generation system capable of monitoring a plurality of solar modules individually using one ZigBee module installed for each solar array.
The present invention also provides a photovoltaic power generation system capable of monitoring a leakage current for each photovoltaic module.
The present invention also provides a photovoltaic power generation system capable of diagnosing a photovoltaic module in consideration of external environmental factors such as the amount of sunshine and the temperature of the photovoltaic module.
Other objects of the present invention will become readily apparent from the following description of the embodiments.
According to an aspect of the present invention, there is provided a photovoltaic power generation system having a monitoring function of a photovoltaic module in consideration of an external environmental factor, the photovoltaic power generation system including at least one And the diagnostic unit determines whether the voltage value of the solar module to be diagnosed included in the solar array is less than or equal to a first reference value, Determines whether or not the voltage value of the solar module to be diagnosed is equal to or less than the average value of the solar array, if the voltage value of the solar module to be diagnosed is less than the average value of the total solar array, It is determined that there is an abnormality in the diagnosis target solar module, When the voltage value of the diagnosis target photovoltaic module is determined to be greater than the overall average the solar array, also determines that the diagnosis target photovoltaic module normal; And a reference value setting unit for setting the first reference value in consideration of external environmental factors.
The diagnosing unit may be configured such that the voltage value of the solar module to be diagnosed is equal to or less than a total average value of the solar array including the diagnostic module and the voltage value of all the solar modules adjacent to the solar module If it exceeds the first reference value, it can be determined that the diagnosis target solar module is defective.
When the voltage value of at least one of the solar modules adjacent to the solar module to be diagnosed is equal to or less than the first reference value and the voltage reduction rate of the solar module to be diagnosed is equal to or less than the second reference value, It can be judged that the target solar module is contaminated.
The diagnosis unit may determine that a shadow has occurred in the diagnosis target solar module when the voltage reduction rate of the diagnosis target solar module exceeds the second reference value.
When the voltage value of the solar module to be diagnosed exceeds a total average value of the solar array and the rate of decrease of the average value of the solar array is equal to or less than a third reference value, It can be judged that the contamination occurs in the solar array including the solar array.
The diagnosis unit may determine that a shadow has occurred in the solar array including the solar module to be diagnosed when the rate of decrease of the total average value of the solar array exceeds the third reference value.
The reference value setting unit may set the first reference value using at least one of the temperature and the illuminance in the diagnosis target solar module and the output voltage characteristics of the diagnosis target solar module.
As described above, according to the present invention, when the efficiency deterioration of the solar array exceeds a threshold value, the solar array can be separated from the system in order to prevent a faulty power source from being supplied to the system.
In addition, the present invention divides the cause of the efficiency reduction of the photovoltaic module into faults, shadows, and dirts and informs the operator that the operator immediately takes measures such as repair, replacement, and cleaning .
In addition, the solar array and the ZigBee module are integrated with each other, so that it is possible to prevent the inconvenience of installing the ZigBee module separately. If the solar array and the ZigBee module are integrally formed, the identification number of the ZigBee module may be changed according to the installation position of the solar array. Therefore, it is necessary to give the identification number of the ZigBee module after installation of the solar array. The present invention enables the ZigBee module to be set wirelessly even if the solar array and the ZigBee module are integrally manufactured, thereby avoiding the troublesomeness associated with the setting of the ZigBee module located on the back surface of the solar array.
Further, according to the present invention, the voltage values of a plurality of solar modules are collected into one packet and transmitted to the central management unit, thereby minimizing the load on the ZigBee module and the central management unit according to packet transmission / reception.
Further, according to the present invention, a plurality of solar modules can be individually monitored using one ZigBee module installed for each solar array.
In addition, the present invention can monitor the leakage current for each solar module.
In addition, the present invention can diagnose a solar module in consideration of external environmental factors such as the amount of sunshine and the temperature of the solar module.
1 is a schematic diagram of a solar power generation system according to a preferred embodiment of the present invention.
Fig. 2 shows a rear view of the solar array of Fig. 1. Fig.
FIG. 3 shows a functional block diagram of the ZigBee module of FIG. 2. FIG.
4 shows a packet transmitted from the ZigBee module to the central management unit.
5 is a functional block diagram of the central management unit.
6 shows a data structure stored in the database of Fig.
FIG. 7 shows an operation flowchart of the array management unit of FIG. 5;
Fig. 8 shows an operation flow chart of the diagnosis unit of Fig. 5; Fig.
While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.
Like reference numerals are used for like elements in describing each drawing. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.
For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.
And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.
It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, .
On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.
The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention.
The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.
Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.
Hereinafter, a solar power generation system according to a preferred embodiment of the present invention will be described with reference to FIGS. 1 to 8. FIG.
1 is a schematic diagram of a solar power generation system according to a preferred embodiment of the present invention.
1, a photovoltaic power generation system includes
The
The output voltage (DC voltage) of the
The
Here, the protocol constituting the
Fig. 2 shows a rear view of the solar array of Fig. 1. Fig.
Referring to FIG. 2, one
FIG. 3 shows a functional block diagram of the ZigBee module of FIG. 2. FIG.
3, the
The
The
The voltage
The
The
The leakage
4 shows a packet transmitted from the ZigBee module to the central management unit. Referring to FIG. 4, a packet transmitted from the
5 is a functional block diagram of the central management unit. The
The
The
The
Hereinafter, with reference to FIG. 7, a specific operation of the
Referring to FIG. 7, the
5, the
The reference
The reference
[Equation 1]
Reference voltage value = basic reference voltage value * (1+ voltage increase rate with increasing or decreasing temperature) * (1+ voltage increasing rate with increasing or decreasing luminance)
For example, when the base voltage is 40 V, the temperature of the solar module is 60 캜, the illuminance of the solar module is 1200 W /
The reference voltage value may be 40 * (1-0.2) * (1 + 0.05) = 33.6V.
In contrast to the above, the reference voltage value according to the illuminance is stored for the date and time in the area where the corresponding photovoltaic module is located, and the reference voltage value matched at the diagnosis time at diagnosis can be used for diagnosis. Only one of the illuminance and the temperature may be considered for setting the reference voltage value.
When only the temperature is considered, the reference
Alternatively, when only the illuminance is considered, the reference voltage value can be calculated by referring to the output voltage change characteristic of the solar module according to the change in the illuminance of the previously stored solar module. For use of the reference
Hereinafter, a specific operation of the
Referring to FIG. 8, the
If it is determined in step S1101 that the voltage value of the solar module to be diagnosed is lower than the first reference value, the
As a result of the determination in S1102, if it is determined that the output voltage value of the solar module to be diagnosed is equal to or less than the overall average value of the solar array including the module, the
As a result of the determination in S1103, if it is determined that at least one solar module of the neighboring solar modules is less than or equal to the first reference value, it may be determined whether the voltage reduction rate of the solar module to be diagnosed is less than a predetermined second reference value S1104). The probability of two neighboring solar modules failing at the same time is very low. Accordingly, when two or more neighboring solar modules are equal to or less than the first reference value, it is sufficient to judge whether the solar modules to be diagnosed are shaded or contaminated. As mentioned earlier, when the shade is generated, the voltage reduction rate is large, and when the pollution occurs, the voltage reduction rate may be small. Accordingly, if it is determined in step S1104 that the voltage reduction rate of the solar module to be diagnosed is lower than the second reference value, the
As described above, the present invention can perform diagnosis for each solar array and / or for each solar module. The diagnostic result for each solar array and / or photovoltaic module may be stored in the
As described above, according to the present invention, when the efficiency deterioration of the solar array exceeds the threshold value, the solar array can be separated from the system in order to prevent the faulty power from being supplied to the system.
In addition, the present invention divides the cause of the efficiency reduction of the photovoltaic module into faults, shadows, and dirts and informs the operator that the operator immediately takes measures such as repair, replacement, and cleaning .
In addition, the solar array and the ZigBee module are integrated with each other to prevent the inconvenience of installing the ZigBee module separately. When the solar array and the ZigBee module are integrally formed, the identification number (or the solar array identification number) of the ZigBee module corresponding to the solar array can be varied according to the installation position of the solar array. Therefore, it is necessary to give the identification number of the ZigBee module after installation of the solar array. The present invention enables the ZigBee module to be set wirelessly even if the solar array and the ZigBee module are integrally manufactured, thereby avoiding the troublesomeness associated with the setting of the ZigBee module located on the back surface of the solar array.
In addition, the present invention can minimize the load on the ZigBee module and the central management unit according to the packet transmission / reception by collecting the values of the plurality of solar modules as one packet and transmitting them to the central management unit.
The present invention can diagnose a solar module in consideration of external environmental factors such as the amount of sunshine and the temperature of the solar module.
It will be apparent to those skilled in the relevant art that various modifications, additions and substitutions are possible, without departing from the spirit and scope of the invention as defined by the appended claims. The appended claims are to be considered as falling within the scope of the following claims.
1000a, 1000b, 1000c: solar array
1100: Photovoltaic module
1200: ZigBee module
1210:
1220: voltage measuring unit
1230:
1240: Setting unit
1250:
1260: Leakage current supply
2000: DC connection board
3000: Inverter
4000: Central Management Department
4100:
4200:
4300:
4400:
4500: Interface part
4600:
4700: Reference value setting section
5000: Network
6000a, 6000b, 6000c:
Claims (7)
A diagnostic unit for performing diagnosis for each of at least one solar module included in the solar array; the diagnosis unit determines whether a voltage value of the solar module to be diagnosed included in the solar array is below a first reference value Determining whether a voltage value of the solar module to be diagnosed is equal to or less than a total average value of the solar array module when it is determined that the voltage value of the solar module to be diagnosed is equal to or less than the first reference value, Determines that there is an abnormality in the diagnostic target solar module if it is determined that the voltage value is equal to or less than the average value of the total solar array array,
Determines that the diagnosis target solar module is normal if it is determined that the voltage value of the solar module to be diagnosed exceeds the overall average value of the solar array,
The first reference value is calculated by the following equation,
First reference value = basic reference voltage value * (1+ voltage increase rate with increasing or decreasing temperature) * (1+ voltage increase rate with increasing or decreasing luminance)
Lt; / RTI >
The basic reference voltage value is an output voltage of the solar module in the reference state,
Calculating a maximum luminance value among the luminance values detected by the luminance sensor attached to each of the four corners of the solar array when calculating the voltage increase rate according to the increase / decrease of the luminance,
Wherein the temperature of the solar module for determining the increase or decrease in temperature and the illuminance of the solar module for determining the increase or decrease in the illuminance are sampled together with the voltage value of the solar module to be diagnosed. Photovoltaic system.
Wherein the diagnosis unit comprises:
Wherein the voltage value of the solar module to be diagnosed is less than a total average value of the solar array including the diagnostic module,
When the voltage value of all the solar modules adjacent to the diagnosis target solar module exceeds the first reference value,
And determines that the diagnosis target solar module is malfunctioning.
Wherein the diagnosis unit comprises:
Wherein a voltage value of at least one of the solar modules adjacent to the solar module to be diagnosed is equal to or less than the first reference value,
When the voltage reduction rate of the solar module to be diagnosed is equal to or less than the second reference value,
And determines that contamination has occurred in the solar module to be diagnosed.
Wherein the diagnosis unit comprises:
When the voltage reduction rate of the solar module to be diagnosed exceeds the second reference value,
And determines that a shadow has occurred in the diagnosis target solar module.
Wherein the diagnosis unit comprises:
It is determined that the voltage value of the solar module to be diagnosed exceeds the total average value of the solar array,
When the reduction rate of the total average value of the solar array is equal to or less than the third reference value,
And determines that contamination has occurred in the solar array including the solar module to be diagnosed.
Wherein the diagnosis unit comprises:
When the reduction rate of the total average value of the solar array exceeds the third reference value,
And determines that a shadow has occurred in the solar array including the diagnosis target solar module.
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KR102272948B1 (en) | 2020-11-18 | 2021-07-06 | 센트리닉스 주식회사 | Distributed Module-Level Photovoltaic Solar Power Generation Monitoring and Control System using Decentralised Wireless Mesh Network |
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KR20090002295A (en) * | 2007-06-26 | 2009-01-09 | 대한전선 주식회사 | A unified management and follow up control system and method in solar photovoltatic power generation facility |
KR101066064B1 (en) * | 2010-11-22 | 2011-09-20 | (주)대은 | Motorning apparatus for solar cell module and method thereof |
KR20110136466A (en) * | 2010-06-15 | 2011-12-21 | 연세대학교 산학협력단 | Power output lowering detection apparatus of photovoltaic power generation system and detection method of power output lowering of photovoltaic power generation system |
KR101257665B1 (en) * | 2013-01-04 | 2013-04-30 | (주)우진기전 | Solar photovoltaic power generator |
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KR20090002295A (en) * | 2007-06-26 | 2009-01-09 | 대한전선 주식회사 | A unified management and follow up control system and method in solar photovoltatic power generation facility |
KR20110136466A (en) * | 2010-06-15 | 2011-12-21 | 연세대학교 산학협력단 | Power output lowering detection apparatus of photovoltaic power generation system and detection method of power output lowering of photovoltaic power generation system |
KR101066064B1 (en) * | 2010-11-22 | 2011-09-20 | (주)대은 | Motorning apparatus for solar cell module and method thereof |
KR101257665B1 (en) * | 2013-01-04 | 2013-04-30 | (주)우진기전 | Solar photovoltaic power generator |
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KR102272948B1 (en) | 2020-11-18 | 2021-07-06 | 센트리닉스 주식회사 | Distributed Module-Level Photovoltaic Solar Power Generation Monitoring and Control System using Decentralised Wireless Mesh Network |
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