KR20130052137A - Remote monitoring system for solar cell problem - Google Patents

Abstract

PURPOSE: A fault diagnosis remote monitoring system of a solar cell panel is provided to maintain and operate a photovoltaic power plant in an optimal state by diagnosing an operational status of a solar cell panel module of a photovoltaic power plant being unmanly operated. CONSTITUTION: A fault diagnosis remote monitoring system of a solar cell panel consists of solar cell panel small groups(SG-SGn), a power measurement unit(13), power measurement values(P1-Pn), a daylight measurement sensor(14) and a microprocessor(20). The solar cell panel small groups are formed by small grouping more than two serially connected solar cell panel modules(11) and includes a solar cell panel module, a power line(12), a standard resistor and a voltage measurement line. The power measurement unit periodically measures voltage from the voltage and current measurement line drawn out from the power line, A/D converting, giving an ID number and transmits the converted current and voltage value and the ID number to the microprocessor according to the determined period. The microprocessor judges an unbalanced state by comparing an instantaneous power measurement value among the each solar cell panel small group in a predetermined time interval. The microprocessor processes an operational state and degradation of the solar cell panel.

Description

Fault diagnosis remote monitoring system of solar panel {REMOTE MONITORING SYSTEM FOR SOLAR CELL PROBLEM}

The present invention relates to a failure diagnosis system of a plurality of solar panels installed in a photovoltaic power plant, and more particularly, means for detecting the operation state of a small group by dividing the plurality of solar panels of the photovoltaic power plant into small groups. In addition, the present invention relates to a fault diagnosis remote monitoring system for a solar panel that can remotely detect and monitor a fault state of a small group.

Recently, due to the depletion of fossil fuels and global warming due to the use of fossil fuels, the development and dissemination of alternative energy is urgent, and the government is gradually increasing the share of alternative energy among domestic energy consumption.

Today, as the most environmentally friendly and infinite energy source of alternative energy, the photovoltaic power generation system that converts solar energy directly into electric energy is in the spotlight, and the government's support is expanding rapidly. Such a photovoltaic power generation system is composed of a plurality of solar panel modules for converting electrical energy by receiving sunlight, and a plurality of solar panel modules are connected in series or in parallel to obtain the required power.

In general, photovoltaic power generation systems are used to connect solar panel modules in parallel to increase the current capacity and to connect in series to increase the voltage.

However, since a plurality of solar panel modules are connected in series or in parallel, when one of the unit solar panel modules constituting an abnormality occurs, the entire solar panel group including the unit solar panel module is abnormal. do.

Accordingly, the solar panel module used for solar power generation has the same voltage and current specifications, and connects a plurality of solar panels in parallel to parallel locations in parallel to form a solar panel group to connect the generated power to an inverter or a power load. .

At present, most of the solar power generation systems are operated unattended because the installed places such as the foot of the mountain, the roof of the building, and the idle area are hard to reach. Therefore, since it is very difficult to efficiently manage the solar panel modules after installation, a means for remotely diagnosing the status of failure or malfunction of each solar panel module is required.

In Korean Patent Nos. 10-1023445 and 10-0918964, voltage and current sensor detection units for detecting operating states of a plurality of solar cell modules generating power from sunlight, and identification codes of respective solar cell modules are provided. According to the data sending command of the central control system, the data signal based on the measurement of the operating state of the solar cell module is sent to the central control system, and receiving the control command of the central control system to control the operating state of each unit. Although a solar cell module remote monitoring and control system has been disclosed, a number of solar cell modules installed at a solar power plant site need to install a sensor for detecting a voltage and current signal, and wiring is very expensive for every sensor. There is a problem.

Korean Patent No. 10-0983236 discloses a comparative analysis of a voltage detector that detects intermediate voltage characteristics of a module group by dividing the solar cell modules into two or more module groups, and a total voltage characteristic and an intermediate voltage characteristic detected by the voltage detector. By detecting the abnormality and abnormal parts of the solar cell string and detecting the abnormality of the main parts in real time, the intelligent management type solar power generation system of the solar power generation system is disclosed. Since the voltage and the voltage are greatly affected by the illuminance and temperature that change frequently, there is a problem that it is difficult to detect the abnormality by detecting only the voltage characteristics of the module group.

Korean Patent No. 10-0944793 discloses a control unit equipped with a display device for output voltage, current measurement, and output calculation function of a solar cell array, and a solar radiation meter installed on the solar cell array to allow an output to be input to the control unit. It is composed of a temperature sensor and a remote monitoring device connected to the control unit so that it is possible to connect a solar radiation meter and a temperature sensor when necessary to monitor the deterioration state or failure state of the solar cell array used in the photovoltaic power generation system. The solar cell array provides a simple and inexpensive solar cell array monitoring function. The present invention discloses an additional photovoltaic power converter and its operation method. However, a large number of installed solar cell arrays detect voltage and current signals. And the output sensor need to be installed and each sensor has its own wiring In addition to this problem, if the solar cell array is installed on a slope such as a wide foothill, the solar cell array's irradiation dose and solar radiation meter may cause variations in the solar cell array due to the shadows of the mountains or the passing clouds. Due to its large size, there is a problem in that a solar power plant cannot be operated / maintained in an optimal state because an administrator or a user cannot accurately determine a failure state or deterioration state of the solar cell array compared to the measured value of the solar radiation meter.

Accordingly, the present invention is to solve the above-mentioned conventional problems, the remote diagnosis of the solar panel, which enables the user or administrator to economically diagnose and grasp the operation state of the solar panel module of the photovoltaic power plant being operated unattended remotely The objective is to provide a monitoring system to keep the solar power plant in optimal condition.

Another object of the present invention is to provide a remote monitoring system that can detect the failure or deterioration of the solar panel without being affected by changes in solar altitude or illuminance of the solar panel module installation place.

In order to achieve the above object, the fault diagnosis remote monitoring system of the solar panel module of the present invention is divided into at least two solar panel modules grouped in series, and measures voltage and current in the solar panel small group power line. Measure instantaneous power, and install a solar radiation meter near the small group, measure the instantaneous solar radiation, and measure the instantaneous solar radiation as a reference value, and compare the measured instantaneous electric power values of the solar cell small groups at predetermined time intervals with an unbalanced state. The microprocessor determines the operation state and deterioration of the solar panel module of the solar panel subgroup by comparing the measured instantaneous solar radiation reference value with the measured instantaneous power value of the individual solar panel subgroup. Determination of status and deterioration status and remote control of data Characterized in that it comprises a communication means for transmitting to the user's mobile communication terminal.

The remote diagnosis system for solar panel failure diagnosis according to the present invention divides the solar panel modules installed in the photovoltaic power plant into small groups, compares the instantaneous power of each small group, and compares the instantaneous power measurement value with the instantaneous power of each small group, It is possible to economically diagnose failures because it is possible to determine a small group of failed solar panels without installing a measuring sensor and wiring all solar panels.

In addition, when an abnormality occurs, by notifying the mobile terminal of the user or administrator to the wireless mobile communication means, it is possible to grasp the fault state of the solar cell sub-group from the remote site and to take measures to maintain the solar power plant in an optimal state.

1 is a conceptual diagram showing the overall configuration and arrangement of components according to an embodiment of the present invention.
2 is a block diagram showing the overall configuration according to an embodiment of the present invention.
3 is a reference diagram showing the overall configuration and arrangement of components according to an embodiment of the present invention.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the drawings. In the detailed description, descriptions of conventional technologies such as an inverter, a mobile communication network, and a mobile communication terminal for converting power generated by the solar panel will be omitted.

1 is a conceptual diagram showing the overall configuration and arrangement of each component according to an embodiment of the present invention, Figure 2 is a block diagram according to an embodiment of the present invention.

As shown, in a typical solar power plant for directly converting the light energy of the sun into electrical energy, the solar panel sub-groups (SG1) ~ by sub-grouping at least two of the solar panel modules 11 connected in series (SGn), power measuring means (13) and power measurement values (P1) to (Pn) for measuring power by measuring the voltage and current of the solar cell sub-groups (SG1) to (SGn), and each of the above aspects The solar radiation measuring sensor 14 and the measured solar radiation L1 to (Ln) installed in the vicinity of the panel small groups SG1 to SGn and the solar panel small groups SG1 to SGn at predetermined time intervals. The power measurement values P1 to Pn are compared with each other, and in the case of an unbalanced state, it is determined to be abnormal. Furthermore, the solar power is measured at the power measurement value P1 of the solar panel small group SG1 and the solar radiation value L1 measured at the corresponding place. The solar panel small group (SG1) is compared with the amount of power Pc corrected for the area of the panel small group (SG1). Microprocessor 20 for determining and processing the operating state and deterioration of the (SGn) ~ (SGn), the alarm message of the operating state and degradation state of each of the solar cell sub-groups (SG1) ~ (SGn) in the microprocessor 20 and It characterized in that it comprises a communication means for transmitting data to the mobile terminal 40 of the remote user via the wireless communication module (3).

The solar cell sub-group SG1 measures a voltage from the plurality of solar panel modules 11 and the power line 12 connected in series to obtain a predetermined voltage and the power line 12, and measures the current to measure the current. And a solar cell sub-group SG1 having a standard resistor (not shown) connected to any one of the power lines 12 and a voltage measuring line proportional to the current from the standard resistor.

The solar panel module 11 is composed of a plurality of solar cells. When the solar cell is silicon, the voltage generated in each solar cell is about 0.6V, and the amount of power produced is determined by insolation and size (area). It depends, but it is about 1.5W per cell. Therefore, in order to produce the required voltage and power, solar cells are electrically connected in series and in parallel.

The photovoltaic power generation system is greatly influenced by the solar radiation amount 15 and the temperature of a specific place where the solar panel module 11 is located. The solar radiation system and the temperature change from time to time, season, weather, and the like. Therefore, in order to diagnose whether the solar panel modules 11 are generating power normally, the solar radiation amount 15 and the temperature in the vicinity of the corresponding solar panel sub-groups SG1 to SGn at the time of measurement / diagnosis are measured and the reference solar radiation amount is measured. This should be compared with the instantaneous power generated by the corresponding solar panel subgroups SG1 to SGn.

The solar radiation amount means the amount of solar energy received in unit time in unit time, and is expressed as an instantaneous amount of radiation and a total amount of heat received in a unit area for a predetermined time. The solar radiation data of the solar radiation meter of the present invention is sampled every 10 seconds. It accumulates and calculates the difference and the difference one minute before every minute and uses it as the reference solar radiation value to compare with the instantaneous power of the solar cell sub-group SG1.

The power measuring means 13 of the solar panel small group SG1 periodically measures and A / D-converts the voltage from the voltage and current measuring lines drawn from the power line 12 of the solar panel small group SG1, and uniquely identifies it. Power measurement means for assigning a number, and transmitting the converted digital current and voltage value and the unique identification number to the microprocessor 20 according to a predetermined period, and converts it into a power value according to a calculation formula of a program inputted from a computing device. It consists of (13).

Since the voltage of the power line 12 of the solar cell small group SG1 is in the form of a DC voltage V, when the current A flowing through the power line 12 is measured, it can be converted directly into power (W = V? A). have. In order to measure the DC current flowing through the power line 12, a standard resistor R is connected in series to one line of the power line 12, and indirectly due to the voltage difference E generated at both ends of the standard resistor R. The current I can be measured. That is, since the current I = E / R flowing in the conductive wire can be expressed, the current I can be known from the voltage difference E and the resistance value R. In order to actually measure the current I, A / D conversion of the voltage measured at both ends of the standard resistor R is sent to the microprocessor 20 and converted into a current I value by a program calculation formula.

The microprocessor 20 is an interface (not shown) for receiving a digital value corresponding to the A / D converted current and voltage from the power measuring means 13, the unique identification number, the solar radiation from the solar radiation meter, and the interface. The digital voltage / current measurement value and the solar radiation measurement value of the unique identification number received from the data are stored in the storage device, and the amount of power is corrected by applying a constant according to the characteristics and size of each of the solar cell subgroups SG1 to SGn. The amount of power measured at each of the solar panel subgroups SG1 to SGn is lower than the standard solar radiation near the solar panel, or compared to the solar cell subgroups SG1 to SGn If the cumulative power is out of a predetermined deviation value, the operation device to determine that the abnormality, the area of the solar panel module 11 of the solar panel subgroups (SG1) ~ (SGn), the number of installation and calculation program, etc. And a key input unit for inputting, key consists of the input value and the calculation process such as the LCD monitor to display the result, the microprocessor 20 having a memory device for storing programs and data.

The communication means, when it is determined that the operation processing result of the microprocessor 20 is abnormal, the wireless module 30 for transmitting to the mobile communication terminal 40 of the administrator or the user using the WAP, and the wireless module 30 ) And the remote control manager to the remote manager or the user's mobile communication terminal 40 through the existing mobile communication network and the alarm data and the measured data stored in the storage device corresponding to the unique number and abnormal state of the solar panel sub-group 10. By sending it to the user, it is possible to remotely know which solar cell sub-group 10 is abnormal.

To briefly describe the active operation of the remote monitoring system, an administrator or a user who wants to remotely monitor the application is installed in the mobile communication terminal to access the microprocessor 20 and to the microprocessor 20. When the status check request is transmitted, the microprocessor 20 transmits the current or past result extracted by the status check request from the manager or the user to the mobile communication terminal of the manager or the user.

In the present embodiment, by using the WAP (Wireless Application Protocol) installed in the microprocessor 20 and the mobile communication terminal of the administrator or the user to enable wireless data communication between both devices, remote monitoring can be performed without additional equipment. Can be done. The WAP acts as a communication emulator, and converts the received / demodulated signal from the other party into meaningful information according to a predetermined protocol. It allows you to monitor.

SG1: Small group of 1st solar panel SGn: Small group of 1st solar panel
11: solar panel module 12: power line
13 power measuring means 14 solar radiation measuring sensor
15: solar radiation signal line 16: solar radiation meter
2O: microprocessor 30: wireless communication module
40: mobile communication terminal

Claims (5)

In a typical solar power plant that connects a plurality of solar panels in series to a predetermined voltage in order to convert the light energy of the sun directly into electrical energy,
A solar panel sub-group in which at least two solar panels in series are sub-grouped,
A power measurement means and a power measurement value for measuring instantaneous power by measuring voltage and current of the solar cell sub-population;
A solar radiation meter and a measured instantaneous solar radiation amount installed in the vicinity of each of the solar panel sub-groups,
The unbalance state is determined by comparing the instantaneous power measurement values of each of the solar panel subgroups at a predetermined time interval. A microprocessor for determining and calculating the operation state and deterioration of the solar panel of the small solar panel group compared to the corrected instantaneous power amount;
And a wireless communication module for determining the operating state and the deterioration state of each solar panel sub-group in the microprocessor and transmitting data to a mobile terminal of a remote user. The solar cell sub-population of claim 1 includes a plurality of solar panels and power lines connected in series to obtain a predetermined voltage, a voltage measurement line drawn from the power lines, and a standard connected to one of the power lines to measure current. And a solar panel sub-population having a resistance and a current measuring line drawn out from the standard resistor. According to claim 1, The power measuring means of the solar panel sub-group, the analog signal from the voltage and current measurement line drawn from the power line of the solar panel sub-group is respectively measured to give a unique identification number to the A / D conversion and the solar panel sub-group And a power measurement means for transmitting the digitally converted current and voltage value and the unique identification number to the microprocessor according to a predetermined cycle to recognize the unique identification number and calculate the digital voltage / current value in the calculation circuit and convert the power value into a power value. Failure diagnosis remote monitoring system of a solar panel comprising a. The microprocessor of claim 1, further comprising: an interface for receiving the unique identification number, the power signal, and the solar radiation amount of each solar panel sub-group, and storing the digital power and the solar radiation data of the unique identification number received from the interface in a storage device. Computational processing of the corrected solar radiation in the solar panel small group by comparing and calculating the power of the solar panel in a small group of solar panels, the key input unit for inputting the area, installation number, program, etc. And a microprocessor having an LCD monitor for displaying input values and calculation results, and a memory for storing programs and data. The wireless communication module according to claim 1, wherein the wireless communication module transmits to the user's mobile terminal using the WAP when it is determined that the result of the processing of the microprocessor is abnormal, and through the wireless module and the existing mobile communication network, Solar panel failure diagnosis remote monitoring system comprising a wireless communication module for transmitting a predetermined alarm character and data in response to an abnormal state to the mobile communication terminal.

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