KR20130007337A - Solar cell degraded accelerating device, maximum load point chasing device of the same, solar cell accelerating method maximum load point chasing method of the same - Google Patents

Solar cell degraded accelerating device, maximum load point chasing device of the same, solar cell accelerating method maximum load point chasing method of the same Download PDF

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Publication number
KR20130007337A
KR20130007337A KR1020110065323A KR20110065323A KR20130007337A KR 20130007337 A KR20130007337 A KR 20130007337A KR 1020110065323 A KR1020110065323 A KR 1020110065323A KR 20110065323 A KR20110065323 A KR 20110065323A KR 20130007337 A KR20130007337 A KR 20130007337A
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South Korea
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solar cell
load
value
unit
voltage
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KR1020110065323A
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Korean (ko)
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KR101232648B1 (en
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박상현
조준식
윤경훈
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한국에너지기술연구원
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00—Arrangements for measuring electric power or power factor
    • G01R21/06—Arrangements for measuring electric power or power factor by measuring current and voltage
    • 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

Abstract

PURPOSE: A solar cell deterioration accelerating apparatus, a maximum load point tracing apparatus, a solar cell deterioration accelerating method, and a maximum load point tracing method are provided to accurately predict a solar cell by applying load of a solar cell. CONSTITUTION: A solar cell fixing unit(120) fixes a solar cell(200). A load unit(112) is connected to the solar cell. The loading unit has a variable load value. A power measuring unit measures power outputted from the solar cell. A load control unit(116) is formed by using the maximum power value of the solar cell and controls a load value of the loading unit. [Reference numerals] (112) Load unit; (114) Load control unit; (116) Voltage control unit; (120) Solar cell fixing unit; (130) Environment control unit; (200) Solar cell

Description

SOLAR CELL DEGRADED ACCELERATING DEVICE, MAXIMUM LOAD POINT CHASING DEVICE OF THE SAME, SOLAR CELL ACCELERATING METHOD MAXIMUM LOAD POINT CHASING METHOD OF THE SAME}

The present invention relates to an apparatus for accelerating deterioration of a solar cell; More specifically, the maximum load point that can be additionally installed in the solar cell deceleration accelerator and the solar cell deceleration accelerator which can determine how much deterioration occurs in the solar cell, a phenomenon in which the output of the solar cell is continuously decreased over time. The present invention relates to a tracking device, and also to a solar cell degradation acceleration method and a maximum load point tracking method that can be additionally added to the solar cell degradation acceleration device.

Silicon thin film solar cell is widely used as a solar cell outdoors due to its large area and low price. However, the power output from the solar cell gradually decreases over time in the process of power generation outdoors. The problem is that the phenomenon is large.

Therefore, it is important for companies that manufacture silicon thin film solar cells to continue to suppress such deterioration, but at the same time, due to the inherent characteristics of silicon thin film solar cells, some degree of deterioration may occur over time. It is also important to predict and analyze what is happening in the cell. That is, when the silicon thin film solar cell is installed outdoors, it is a major factor in establishing the reliability of the user by informing the user how much the power output from the silicon thin film solar cell is reduced compared to the initial installation after 10 or 20 years. This can be

In order to check the deterioration of the silicon thin film solar cell, it is impossible to install the solar cell outdoors for several decades and measure the degree of deterioration. Therefore, a deterioration acceleration device that artificially deteriorates the solar cell is used. The deterioration acceleration device deteriorates a solar cell fixed in a chamber by using conditions such as light, temperature, and humidity of a specific amount of light.

The conventional deterioration acceleration device as described above has a problem that the accuracy is lowered and the reliability is lowered because the deterioration is accelerated by only light, temperature, and humidity as variables.

The present invention is to solve the above problems; An object of the present invention is to provide a technique for a factor that can increase the reliability of the solar cell deterioration acceleration device.

Solar cell deterioration acceleration device of the present invention to achieve this object; Solar cell fixing unit for fixing the solar cell; A load unit electrically connected to the solar cell and having a variable load value; A power measuring unit measuring power output from the solar cell fixed to the solar cell fixing unit; And a load controller configured to control a load value of the load unit by using a maximum power value of the solar cell measured by the power measurement unit. Characterized in that it comprises a.

And an environment control unit controlling any one or more of light, temperature, and humidity applied to the solar cell fixed to the solar cell fixing unit. And further comprising:

In this case, the power measuring unit measures the voltage and current output from the solar cell in real time, and the load control unit calculates the maximum power value using the voltage and current measured by the power measuring unit, and the calculated maximum power value The load value is calculated using the corresponding voltage and current, and the variable load value of the load unit is controlled using the calculated load value.

On the other hand, the maximum load point tracking device of the solar cell deterioration acceleration apparatus of the present invention to achieve this object; A load unit electrically connected to the solar cell of the apparatus for accelerating deterioration of the solar cell by applying one or more of light, temperature and humidity to the solar cell and having a variable load value; A power measuring unit measuring power output from the solar cell; And a load controller configured to control a load value of the load unit by using a maximum power value of the solar cell measured by the power measurement unit. Characterized in that it comprises a.

In this case, the power measuring unit measures the voltage and current output from the solar cell in real time, and the load control unit calculates the maximum power value using the voltage and current measured by the power measuring unit, and the calculated maximum power value The load value is calculated using the corresponding voltage and current, and the variable load value of the load unit is controlled using the calculated load value.

On the other hand, the solar cell degradation acceleration method of the present invention to achieve this object; A voltage / current measuring step of measuring voltage and current output from the solar cell in real time; Calculating a maximum power value using the voltage and current measured in the voltage / current measurement step; A load value calculation step of calculating a load value by using a voltage and a current corresponding to the maximum power value calculated in the maximum power value calculation step; And a load control step of controlling a value of a load electrically connected to the solar cell using the load value calculated in the load value calculation step. And a control unit.

In addition, the maximum load point tracking method of the solar cell deterioration acceleration device of the present invention to achieve this object; A voltage / current measuring step of measuring voltage and current output from the solar cell in real time; Calculating a maximum power value using the voltage and current measured in the voltage / current measurement step; A load value calculation step of calculating a load value by using a voltage and a current corresponding to the maximum power value calculated in the maximum power value calculation step; And a load control step of controlling a value of a load electrically connected to the solar cell using the load value calculated in the load value calculation step. And a control unit.

According to the solar cell deterioration acceleration apparatus according to the present invention having the configuration as described above; By controlling the load value by measuring the power output from the solar cell and applying it to the solar cell deceleration acceleration device, the solar cell is deteriorated by applying the load to variables other than light, temperature and humidity by applying a variable affecting the solar cell deterioration The effect is that the actual solar cell can more accurately predict the degree.

1 is a block diagram showing a solar cell deterioration acceleration device of the present invention.
Figure 2 is a schematic diagram showing a solar cell deterioration acceleration device of the present invention.
Figure 3 is a graph measuring the maximum power point that changes with time in the solar cell deterioration acceleration device of the present invention.
4 is a graph showing the degree of degradation of the solar cell according to the load value in the solar cell deterioration acceleration device of the present invention.

The preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings, in which the technical parts already known will be omitted or compressed for simplicity of explanation.

Solar cell deterioration acceleration apparatus 100 of the present invention, as shown in Figure 1 and 2, comprises an environmental control unit 130, solar cell fixing unit 120 and the maximum load point measuring unit 110, A description with reference to FIGS.

The environmental controller 130 is a place for controlling any one or more of light, temperature, and humidity artificially applied to the solar cell 200, and may control light, temperature, and humidity, respectively, as necessary. That is, a device and a solar cell that irradiate light using a lamp or the like periodically or continuously for a long period of time in a state in which light flowing to the outside is blocked in order to control the light applied to the solar cell 200. It will be possible to control the temperature and humidity to control the temperature or humidity around the periphery of the (200) to be similar to the external environment that the solar cell 200 is installed outside.

The solar cell fixing part 120 is physically fixed to prevent the solar cell 200 from moving in the solar cell deterioration accelerator 100. The solar cell fixing part 120 is electrically connected to the solar cell 200. It is possible that the electrode is provided so that the connection.

The maximum load point measuring unit 110 is electrically connected to the solar cell fixing unit 120, and a current is input from the solar cell 200 to measure power output from the solar cell 200. 112, the power measuring unit 114 and the load control unit 116 is configured.

The load part 112 is electrically connected to an electrode provided in the solar cell fixing part 120 to efficiently draw electric charges generated from the solar cell 200 to the outside of the solar cell 200 and use it as electrical energy. As a resistor connected to the solar cell 200 by an electric circuit, in the present invention, a variable resistor whose resistance value is changed is applied. That is, the load unit 112 is provided at both ends of the electrode output from the solar cell 200, the load unit 112 at this time is provided with a variable load that can change the load value.

The power measuring unit 114 measures the power output from the solar cell 200, and measures voltage and current of power output by irradiating light onto the solar cell 200, respectively. In this case, the measurement is preferably performed in real time, but may be periodically measured as necessary. As described above, the results of the voltage and the current measured by the power measuring unit 114 are as shown in FIG. 3, and the graph shown in FIG. 3 will be described later.

The load control unit 116 calculates the maximum power value using the voltage and current measured by the power measuring unit 114, and calculates the load value using the voltage and current corresponding to the calculated maximum power value, thereby increasing the maximum load. Find the value. By controlling the load unit 112 using the found maximum load value, the load value applied to both ends of the solar cell 200 is controlled.

Referring to this in more detail with reference to Figure 3, the solar cell 200 of the present invention used a silicon thin film solar cell, and if the silicon thin film solar cell is installed outdoors to continue the power generation, the maximum power point is changed. For example, at the initial stage of installation, the maximum power point under certain light conditions changes to different load values when the same light is irradiated a month later. Thus, as shown in FIG. 3, as the silicon thin film solar cell deteriorates, the maximum power point decreases even when measured under the same conditions.

At this time, the maximum power point is the point when the magnitude of power, which is the product of voltage and current in the graph, is the largest. In the first graph 1st shown in FIG. At this time, the load value of 63.3kW is calculated by the ratio of power and current by Ohm's law. Here, the graphs shown in FIG. 3 are the maximum power points measured at one month intervals, respectively, and the maximum power point (MPP) represents the maximum power point.

In other words, in the case of a silicon thin film solar cell installed outdoors, the maximum load value also continuously changes as the maximum power point changes over time. As the process of accelerating deterioration in the state in which the battery 200 is not electrically connected, the change in the load value generated in the actual solar cell is not reflected at all.

Furthermore, looking at the actual case that the deterioration occurs in the solar cell 200 according to the change in the load value, if the load value is applied differently in the same state of light intensity, temperature and humidity, as shown in Figure 4, It can be seen that. Here, it can be seen that the Pmax corresponding to the energy generated in the solar cell 200 changes from -22% to -11% depending on the load condition.

Thus, in the present invention, by actively controlling the load value across the solar cell 200 through the maximum load point measuring unit 110, the load in the process of accelerating deterioration of the solar cell 200 in the solar cell deterioration acceleration apparatus 100 As the value added to the degree of deterioration of the solar cell 200 by the value, it is possible to more accurately identify the degree of deterioration of the solar cell 200.

And the maximum load point tracker in the solar cell deterioration acceleration apparatus 100 of the present invention can be manufactured to be detachable from the solar cell deterioration acceleration apparatus 100. That is, since the maximum load point tracker can be manufactured to be mounted on the existing solar cell deterioration accelerator 100 separately, the maximum load point tracker thus manufactured is connected to the electrodes of both ends of the solar cell 200. In addition, it would be possible to add a variable for the maximum load point to the function of the existing degradation accelerator.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. And the scope of the present invention should be understood as the following claims and their equivalents.

100: solar cell deterioration acceleration device
110: maximum load point meter
112: load portion 114: power measurement unit
116: load control unit
120: solar cell fixing unit 130: environmental control unit
200: solar cell

Claims (7)

Solar cell fixing unit for fixing the solar cell;
A load unit electrically connected to the solar cell and having a variable load value;
A power measuring unit measuring power output from the solar cell fixed to the solar cell fixing unit; And
A load control unit controlling a load value of the load unit by using a maximum power value of the solar cell measured by the power measurement unit; Solar cell deceleration acceleration device comprising a. The method according to claim 1,
An environmental control unit controlling any one or more of light, temperature, and humidity applied to the solar cell fixed to the solar cell fixing unit; Solar cell deceleration acceleration device further comprising. The method according to claim 1,
The power measuring unit measures the voltage and current output from the solar cell in real time,
The load controller calculates a maximum power value using the voltage and current measured by the power measuring unit, calculates a load value by using a voltage and current corresponding to the calculated maximum power value, and uses the calculated load value. Solar cell deceleration acceleration device characterized in that for controlling the variable load value of the load unit. A load unit electrically connected to the solar cell of the apparatus for accelerating deterioration of the solar cell by applying one or more of light, temperature and humidity to the solar cell and having a variable load value;
A power measuring unit measuring power output from the solar cell; And
A load control unit controlling a load value of the load unit by using a maximum power value of the solar cell measured by the power measurement unit; Maximum load point tracking device of the solar cell deterioration acceleration apparatus comprising a. The method of claim 4,
The power measuring unit measures the voltage and current output from the solar cell in real time,
The load controller calculates a maximum power value using the voltage and current measured by the power measuring unit, calculates a load value by using a voltage and current corresponding to the calculated maximum power value, and uses the calculated load value. Maximum load point tracking device of the solar cell deterioration acceleration device, characterized in that for controlling the variable load value of the load unit. A voltage / current measuring step of measuring voltage and current output from the solar cell in real time;
Calculating a maximum power value using the voltage and current measured in the voltage / current measurement step;
A load value calculation step of calculating a load value by using a voltage and a current corresponding to the maximum power value calculated in the maximum power value calculation step; And
A load control step of controlling a value of a load electrically connected to the solar cell using the load value calculated in the load value calculation step; Solar cell deceleration acceleration method comprising a. A voltage / current measuring step of measuring voltage and current output from the solar cell in real time;
Calculating a maximum power value using the voltage and current measured in the voltage / current measurement step;
A load value calculation step of calculating a load value by using a voltage and a current corresponding to the maximum power value calculated in the maximum power value calculation step; And
A load control step of controlling a value of a load electrically connected to the solar cell using the load value calculated in the load value calculation step; Maximum load point tracking method of the solar cell deterioration acceleration apparatus comprising a.
KR1020110065323A 2011-07-01 2011-07-01 Solar cell degraded accelerating device, maximum load point chasing device of the same, solar cell accelerating method maximum load point chasing method of the same KR101232648B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101499761B1 (en) * 2013-12-24 2015-03-09 전자부품연구원 Method for predict a generating energy of the solar module
KR20170023428A (en) 2015-08-24 2017-03-06 전자부품연구원 Test method of potential induced degradation of solar cell

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100535680C (en) * 2005-08-19 2009-09-02 株式会社Ntt设施 Deterioration judging device and method, computer program
JP5020538B2 (en) 2006-05-11 2012-09-05 東芝燃料電池システム株式会社 Deterioration acceleration test method and apparatus for fuel cell stack
KR100944793B1 (en) * 2007-09-05 2010-03-02 한국전기연구원 Power Conditioning System with Diagnosis Function of Photovoltaic Array Deterioration and method for Processing thereof
KR101061025B1 (en) 2011-06-30 2011-08-31 주식회사 유니테스트 Error detecting system and method of solar photovotaic generating apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101499761B1 (en) * 2013-12-24 2015-03-09 전자부품연구원 Method for predict a generating energy of the solar module
KR20170023428A (en) 2015-08-24 2017-03-06 전자부품연구원 Test method of potential induced degradation of solar cell

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