KR102138440B1 - Solar power generator - Google Patents

Abstract

The photovoltaic device includes a solar cell array composed of a plurality of solar cells; A temperature sensor disposed in a space formed between the solar cells and measuring a temperature of the solar cell array to generate a temperature signal; A LoRa communication module disposed on one side of the solar cell array, receiving the temperature signal from the temperature sensor, and converting the temperature signal and a unique identification number of the solar cell array into wireless data and transmitting the wireless signal; And a connection panel receiving the wireless data. The LoRa communication module includes an analog-to-digital converter that converts the temperature signal into a digital signal; A controller configured to collect the digital signals converted by the analog-to-digital converter into one data according to a set order, and to time-divide the collected data to enable identification of the collected data; A memory for temporarily storing the collected data signal; And a communication unit wirelessly transmitting the aggregated data signal.

Description

Solar Power Generator{SOLAR POWER GENERATOR}

The present invention relates to a photovoltaic power generation device, and more specifically, it is possible to prevent the power generation efficiency from deteriorating by analyzing the presence or absence of a failure of the solar cell and the solar cell array based on the wirelessly collecting the state information on the solar cell and based on this It relates to a photovoltaic device.

The photovoltaic device is a device that generates electricity using sunlight, and is composed of a photovoltaic module and a solar cell module. In the photovoltaic module, electricity is produced by direct current and converted to alternating current using an inverter.

The photovoltaic device is composed of several components, and if a failure or an operation error occurs in each component, it must be immediately detected and acted upon.

However, it is difficult to easily detect whether there is an abnormality in the solar power module, an abnormality in the solar cell module, or an abnormality in the inverter. In addition, it is very difficult to determine the standard value of normal solar power generation because the amount of irradiation varies depending on the weather and also depending on the altitude or direction of the sun, which changes depending on the season.

Korean Registered Patent No. 1,728,692 (announced on April 20, 2017) relates to a system and method for predicting failure of a solar module, a database in which real-time change trends for solar power generation by date and time, and a solar radiation, module Disclosed is a configuration for determining whether a photovoltaic power generation module has failed by calculating an estimated amount of photovoltaic power generation in consideration of temperature.

Korean Registered Patent No. 1,728,692 (Apr. 20, 2017) Korean Registered Patent No. 1,593,962 (Public on Feb. 15, 2016)

An object of the present invention is to provide a photovoltaic device capable of determining whether a failure has occurred, a location of a failure, and a cause of a failure.

Photovoltaic device according to embodiments of the present invention for achieving the above object, a solar cell array consisting of a plurality of solar cells; A temperature sensor disposed in a space formed between the solar cells and measuring a temperature of the solar cell array to generate a temperature signal; A LoRa communication module disposed on one side of the solar cell array, receiving the temperature signal from the temperature sensor, and converting the temperature signal and a unique identification number of the solar cell array into wireless data and transmitting the wireless signal; And a connection panel receiving the wireless data. Here, the LoRa communication module, an analog-to-digital converter for converting the temperature signal to a digital signal; A controller configured to collect the digital signals converted by the analog-to-digital converter into one data according to a set order, and to time-divide the collected data to enable identification of the collected data; A memory for temporarily storing the collected data signal; And a communication unit wirelessly transmitting the aggregated data signal.

According to one embodiment, the connection panel determines the presence or absence of a failure for each unit solar string, analyzes the power loss of the unit solar string where the failure occurs, and analyzes the output voltage of the unit solar string in other unit sunlight It can be controlled to be boosted and output the same as the output voltage of the string.

According to an embodiment, the LoRa communication module further includes a standby time setting unit for setting a random waiting time during initial driving, and the communication unit delays wireless transmission of the data signal during the random waiting time, and the communication unit After the random waiting time, the data signal is first transmitted at a first time point, and the data signal is periodically wirelessly transmitted based on a predetermined transmission cycle based on the first time point, and the waiting time setting unit boots the controller. It may operate in response to a reset signal output in the process.

According to an embodiment, the waiting time setting unit updates the random waiting time according to a preset update period until the data receiving confirmation signal is received from the access panel through the LoRa communication module, and the control unit confirms the data reception A reset off signal is generated based on a signal, and the standby time setting unit may stop operation based on the reset off signal.

In the photovoltaic device according to the embodiments of the present invention, it is possible to determine the presence or absence of a failure by measuring the current and voltage of the photovoltaic string. In addition, the solar power generation device can reduce power consumption through the Laura communication module using the Laura communication network. Furthermore, by providing at least one random waiting time during the initial operation of the Laura communication module, it prevents the occurrence of a failure of the photovoltaic device (or the Laura communication network) due to the simultaneous transmission of data signals of the Laura communication modules and is more reliable. Data signals can be acquired.

1 is a view showing a photovoltaic device according to embodiments of the present invention.
FIG. 2 is a block diagram showing an example of an information collection unit included in the photovoltaic device of FIG. 1.
3 is a view for explaining a change in output power according to a failure of a single solar cell array.
4 is a view for explaining a change in output power according to the occurrence of a failure of a plurality of solar cell arrays.
5 is a block diagram illustrating an example of a connection panel included in the photovoltaic device of FIG. 1.
6 is a block diagram showing another example of the information collection unit included in the photovoltaic device of FIG. 1.
7 is a view showing an example of transmitting a data signal from the information collection unit.
8 is a diagram illustrating an example of the photovoltaic device of FIG. 1.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The same reference numerals are used for the same components in the drawings, and duplicate descriptions for the same components are omitted.

1 is a view showing a photovoltaic device according to embodiments of the present invention. FIG. 2 is a block diagram showing an example of an information collection unit included in the photovoltaic device of FIG. 1.

Referring to FIG. 1, the photovoltaic device may include a solar cell array 10 and a connection panel 20 and a display 30.

The solar cell array 10 (or the solar cell module) may be composed of a plurality of solar cells PA electrically connected to each other. Here, the solar cell PA converts light energy of sunlight into electrical energy to generate electric power, and outputs the generated electric power. At least one or more may be provided in consideration of the required amount of power generation and the installation environment.

The solar cell array 10 may include a temperature sensor 12. The temperature sensor 12 is disposed in the space 11 formed between the solar cells PA to measure the temperature of the solar cell array 10 to generate a temperature signal.

When the solar cell array 10 is disposed between two glasses (eg, front glass and rear glass) and encapsulated, the temperature sensor 12 is placed between the glass and the solar cells PA. It can be installed or mounted in a predetermined space 11 to be formed. The temperature sensor 12 may be a semiconductor type temperature sensor such as PTC having excellent response speed. The temperature sensor 12 may detect the temperature of the solar cell PA that is conducted through the encap glasses, and provide the detected temperature (ie, temperature signal) through a separate signal line to the LoRa communication module 100.

The solar cell array 10 may be equipped with a LoRa communication module 100 for collecting and transmitting output power information and temperature information (that is, a temperature signal). LoRa communication module 100 is disposed on one side (for example, an upper side or an upper rear side) of the solar cell array 10, receives a temperature signal from the temperature sensor 12, the temperature signal and the solar cell array 10 ) Can be converted to wireless data and transmitted to the outside. For example, the LoRa communication module 100 may be installed at one end or inside a junction box installed on one side of the solar cell array 10, and may be distinguished from other LoRa communication modules. It may have an identification code. As a power source of the LoRa communication module 100, a part of power produced by the solar cell array 10 may be used, or a separate power source or a dedicated power source may be used, and the LoRa communication module 100 may be used for maintenance in the future. It is preferable to be configured with a detachable and attachable structure to provide convenience.

The LoRa communication module 100 may include a sensing module 110, a control module 120, and a communication module 130 as shown in FIG. 2.

The sensing module 110 is composed of a plurality of sensors to sense the operating temperature, output voltage, output current, and bypass device state of the mounted solar cell array 10, and generates sensing information as an electrical sensing signal. Can print

The sensing module 110 is not shown in the drawing, but may include a correction circuit capable of minimizing the error rate for the detection signal.

The control module 120 may collect detection information sensed and output from each sensing module 110. The detection information collected and provided by the control module 120 may be used as basic data in real-time state change and failure determination of the solar cell array 10, as well as in future aging diagnosis.

The communication module 130 may transmit the detection information collected by the control module 120 to the access panel 20 described below through a wireless communication network. For example, the communication module 130 connects the sensing information collected using LoRa communication, a long-range wireless communication network capable of minimizing power consumption in transmitting data through wireless communication, to the access panel 20 (or access) It can be transmitted to the monitoring server (not shown) through the Laura gateway provided in the class 20.

The communication module 130 may transmit the detection signal collected from the control module 120 to the access panel 20 in a set time period or in real time.

In addition, the communication module 130 is attached to a unique identification signal for the mounted solar cell array 10 and transmits it to the connection panel 20 together with the detection information, such as the connection panel 20 for receiving it, each solar cell Allow the array 10 to be identified.

As described above, the LoRa communication module 100 may be configured to be detached and attached to a selected portion of each solar cell array 10.

For example, the LoRa communication module 100 has a mounting structure configured to be detached and attached to the outside of the solar cell array 10 while accommodating the sensing module 110, the control module 120, and the communication module 130. It can be configured to include a housing.

The connection panel 20 receives and processes power output from the one or more solar cell arrays 10, receives and stores information transmitted from the LoRa communication module 100 of each solar cell array 10, The state of each solar cell array 10 can be monitored.

The connection panel 20 may receive output power from the connected unit solar cell array 10 and transfer it to a power conversion device such as an inverter.

The connection panel 20 may be provided with safety devices such as a circuit breaker and a relay for performing a function of blocking a plurality of connection terminals and electric backflow prevention, short-circuit or overcurrent, etc. according to the number of connected unit solar cell arrays 10. Can.

In addition, the connection panel 20 selectively prevents failures or fire accidents by controlling the output power of the unit solar cell array 10 selectively according to the presence or absence of a failure of the unit solar cell array 10.

For example, the connection panel 20 is used for output power of the unit solar cell array 10 for circuit protection and fire prevention in preparation for reverse current that may occur in each unit solar cell array 10. Paths can be selectively controlled.

That is, the connection panel 20 is an input line for receiving output power output from each unit solar cell array 10 and may include a main circuit and an auxiliary circuit connected in parallel to the main circuit.

And the connection panel 20 is provided at the front end of the main circuit and the auxiliary circuit includes a switching unit for selecting the input path of the output power of the unit solar cell array 10, LoRa communication module of each solar cell array 10 It is possible to analyze the state of each solar cell (PA) and the unit solar cell array 10 through the detection signal received from the (100), at this time, it is determined whether a specific unit solar cell array 10 generates a reverse current In addition, when a reverse current is generated, a problem such as deterioration due to reverse current of the main circuit can be solved by selectively controlling the switching unit to switch the input path from the main circuit to the auxiliary circuit.

In addition, the connection panel 20 may control the switching unit so that the input path to the output power of the unit solar cell array 10 is returned from the auxiliary circuit to the main circuit after the first time set from the time at which the reverse current occurs. It is preferable that the first time is set to a time at which the heat generation of the main circuit due to the reverse current can be sufficiently reduced.

The connection panel 20 may compensate for this when the unit solar cell array 10 causes an output drop due to an increase in temperature or a failure, so that the output power can be normally preserved.

3 is a view for explaining a change in the output power according to the failure of a single solar cell array, the solar cell (PA) constituting the unit solar cell array 10 is 250Wp, open voltage 25V, short-circuit current 10A conditions Assuming that the solar cell (PA) has, (b) the output power of the solar cell (PA) in which no shading occurs in the solar cell array is based on the output power of the solar cell (PA) in which shading (A) occurs. Since the downward leveling phenomenon occurs, in the case of the embodiment of FIG. 3, a power loss of 40% occurs due to some shades of the solar cell array.

In addition, in the case of an array in which (a) the solar cell array and (b) the solar cell array are configured in parallel, the output voltage of the (b) solar cell array is lower than that of the (a) solar cell array, so that power cannot be output. b) Power loss occurs as much as the output of the solar cell array.

On the other hand, Figure 4 is a view for explaining the change of the output power according to the occurrence of the failure of a plurality of solar cell array, (a) ~ (h) in the solar cell array (e) and (h) a part of the solar cell array example For example, when a voltage drop occurs due to a failure caused by factors such as shadow (B), (e) and (h) the solar cell arrays are connected to other solar cell arrays despite producing 400W and 600W of power, respectively. Compared to the lower output voltage, power cannot be sent to PCS devices such as power conditioners and PV inverters, so power loss occurs as much as the production power of (e) and (h) solar cell arrays.

In order to improve this problem, the connection panel 20 determines the presence or absence of a failure for each unit solar cell array 10, analyzes the power loss of the unit solar cell array 10 in which the failure occurred, and analyzes the corresponding unit solar cell array ( The output voltage of 10) is boosted and output to be the same as the output voltage of the other unit solar cell array 10 so that the power produced by the disabled solar cell array 10 can be normally sent to the PCS device.

As an example, the access panel 20 includes an information receiving unit 200, a comparative analysis unit 210, a fault determination unit 220, a voltage boosting unit 230, and a database unit 240 as shown in FIG. Can be configured.

The information receiving unit 200 may receive detection signals transmitted through the wireless communication network from the unit solar cell array 10. The information receiving unit 200 may be equipped with a communication module supporting wireless communication including Laura communication.

The comparison and analysis unit 210 analyzes the detection signal of the solar cell array 10 received from the information receiving unit 200 to determine the state of the solar cell PA and the unit solar cell array 10 composed of them. Analysis. At this time, the state may include the output power, that is, the voltage value and the current value, the temperature of each solar cell array 10, the state change of the bypass diode device, and the like, as described above.

In addition, the comparison and analysis unit 210 may compare and analyze each state information for the analyzed unit solar cell array 10 with a preset reference value in advance and output the result of the processing.

The failure determination unit 220 may receive the processing result of the comparison analysis unit 210 and determine whether the unit solar cell array 10 is defective.

In one embodiment, the comparison analysis unit 210 compares the powers of adjacent solar cell arrays, and the failure determination unit 220 can track the solar position based on the comparison result between the powers of the solar cell arrays. Referring to FIG. 4, for example, it may be assumed that (a) to (h) solar cell arrays are respectively disposed on the top, bottom, left, and right sides of the solar cell array as shown in FIG. 4. In this case, the comparison and analysis unit 210 may compare the power (ie, output voltage * output current) of the solar cell array with the power of each of the solar cell arrays (a) to (h). When the difference in power compared to each other is greater than or equal to a reference value, it may be determined that a specific solar cell array has failed, and when the difference in power occurs below a reference value, the position of the sun can be determined based on this power difference. have. That is, it can be determined that a power difference has occurred due to the position of the sun. This is because when the sunlight is incident perpendicular to the surface of the solar cell array, the power of the solar cell array may be relatively high. For example, when the sun is relatively positioned on the left (eg, at sunset), (e) the amount of power of the solar cell array (d) located on the left (eg, west) relative to the solar cell array ( e) It may be greater than the power of the solar cell array. For another example, when the sun is located relatively on the right (eg, at sunrise), (e) the amount of power of the solar cell array on the right (eg, east) relative to the solar cell array (f) (e) It may be greater than the amount of power of the solar cell array. When the photovoltaic device 1 includes a solar tracking device (for example, a device that supports a solar cell array and adjusts a direction in which an upper surface of the solar cell array faces in response to the position of the sun), By controlling the solar tracking device based on the comparison result, power generation efficiency can be maximized without a separate optical sensor (for example, an optical sensor disposed outside the solar cell array for tracking the solar position).

In one embodiment, the comparison and analysis unit 210 compares the temperatures of the solar cell arrays adjacent to each other and may determine whether a specific solar cell array has failed based on the power comparison result and the temperature comparison result.

For example, when the power of a specific solar cell array is equal to or lower than that of another solar cell array, and the temperature of a specific solar cell array is higher than that of other solar cell arrays, ribbon wire corrosion in a specific solar cell array (ribbon wire) It can be judged that a failure such as corrosion) or cell crack has occurred. For example, when the power and temperature of a particular solar cell array are lower than the power and temperature of another solar cell array, it may be determined that encapsulant discoloration (or decrease in transmittance) occurs in the specific solar cell array. .

The voltage booster 230 receives the determination result of the failure determination unit 220 and grasps the output voltage of the unit solar cell array 10 having an output loss due to a failure and the other unit solar cell arrays 10 adjacent to each other. Thereafter, the output voltage of the unit solar cell array 10 in which a failure has occurred may be boosted and output in the same manner as the other unit solar cell array 10.

The database unit 240 stores detection information received from the information receiving unit 200 and result information processed by the comparison analysis unit 210, the fault determination unit 220, and the voltage boosting unit 230, and accumulates them In addition, in response to an external request signal, related information can be extracted and provided.

Meanwhile, the display 30 may be connected to the connection panel 20 to display status information, analysis and processing results of the solar cell 10 and the unit solar cell array 10.

The display 30 may be installed in an enclosure of the remote control center or the on-site access panel 20, and may be connected to the access panel 20 through a communication network to communicate with each other.

Here, the above-mentioned communication network is an IP network that provides a large-scale data transmission/reception service and an interrupt-free data service through an Internet Protocol (IP), and is an IP network structure that integrates different networks based on IP. It may be an IP network. In addition, the communication network is a wired communication network, a mobile communication network (2G, 3G, 4G, LTE), Wibro (Wireless Broadband) network, HSDPA (High Speed Downlink Packet Access) network, satellite communication network and WiFi (WI-FI, Wireless Fidelity) network Any suitable one can be selectively used.

In addition, when the display 30 exceeds the preset reference value in the displayed information, it is determined as an abnormal situation, and an alarm signal is generated and output through an alarm means such as a speaker or a warning light, so that the administrator can easily detect the abnormal situation. It is preferably configured to be identifiable.

FIG. 6 is a block diagram illustrating another example of the information collection unit included in the photovoltaic device of FIG. 1.

Referring to FIG. 6, the LoRa communication module 100 includes an A/D converter (A/D) and an A/D converter (A/D) that converts detection signals of various sensors for detecting the state of the photovoltaic device into digital signals. A/D) collects the converted data according to the set communication protocol, and stores the collected information in the internal memory, and the control unit 120 and the data generated by the control unit 120 are based on the PHY layer and the MAC layer. It consists of a communication unit 130 for wireless transmission through the upper protocol and application.

Here, various sensors for detecting the state of the solar cell array 10 include a temperature sensor, a humidity sensor, a voltage sensor, and a current sensor, and are composed of a wind direction sensor, a wind speed sensor, and a vibration sensor. Here, the humidity sensor, for example, is disposed in the space 11 between the solar cells PA together with the temperature sensor 12 described with reference to FIG. 1 to detect the humidity inside. The wind direction sensor, the wind speed sensor, and the vibration sensor may be disposed on one side or the outside of the solar cell array 10.

Meanwhile, the control unit 120 of the LoRa communication module 100 time-divisions the input data to identify the multiplexers 121 that collect digital signals detected from each sensor in a set order, and data provided by the multiplexers 121. It consists of a timer 123 for processing and an ISP circuit 125 that stores data in the memory 127 using an ISP (In System Program) method.

In addition, the communication unit 130 performs MAC spreading (CCS) modulation of the data stored in the memory 127 based on the MAC 133 forming the upper protocol based on the PHY layer and the MAC layer and the upper protocol to perform long-distance wireless communication. It consists of a transmitting circuit 135 for sending.

The MAC 133 of the communication unit 130 may be composed of three types of class A, class B, and class C selectable according to low power and response characteristics. Class A is optimized for uplink communication led by the communication unit 130 to maximize low-power characteristics of the communication unit 130. The communication unit 130 generates uplink data only when there is data to be transmitted, and downlink data is available only when uplink data is received, and transmits downlink data to a predefined channel after a predetermined time after receiving the uplink data.

Class B may add a separate window for downlink data transmission, so that downlink data communication led by a base station (or Laura gateway) may be possible at a scheduled time. In addition, a beacon for synchronization between the communication unit 130 and the gateway may be used for low power and low power for periodically checking the presence or absence of downlink data.

Class C is a state in which the data transmission/reception window is always open, and reception may be always possible at the moment of not transmitting. However, Class C is a method that consumes the most power and can be applied when a separate power is supplied to the LoRa communication module 100.

Although not shown, the LoRa communication module 100 may further include a power supply. The power supply unit is a power supply means for driving and operating the LoRa communication module 100. Considering that the LoRa communication module 100 is a small power module, the power supply unit may be assumed to be a cell battery commercially available or an eco-friendly power supply device using a solar cell.

The LoRa communication module 100 receives analog signals from various sensors through an A/D converter (A/D) and converts them into digital signals. Thereafter, each digital signal receives data according to the order of the sensors or a predetermined order using the multiplexer 121.

That is, data received from a plurality of sensors is processed into one data, and as the output data of each sensor is sequentially input and formed, the output data of the sensor must be based on a set order. Therefore, it is necessary to fix the order of sensors connected to the LoRa communication module 100 or to define the order based on the port of the A/D converter (A/D).

Accordingly, the multiplexer 121 receives data provided from a plurality of A/D converters (A/D) in a set order, and processes the time-division signal to identify the data through the timer 123. The processed data is stored in the memory 127 by the ISP circuit 125, and data is stored according to the In System Program method.

Thereafter, the communication unit 130 transmits data stored in the memory 127 according to the Laura communication protocol.

In embodiments, the LoRa communication module 100 may further include a wait time setting unit 129 for setting a random wait time during initial driving. The standby time setting unit 129 may operate in response to a reset signal output (or generated) from the controller 120 during the booting process of the controller 120. In this case, the communication unit 130 delays the wireless transmission of the data signal during the random waiting time, and the communication unit 130 first transmits the data signal at the first time point after the random waiting time, and the predetermined transmission based on the first time point The data signal can be wirelessly transmitted periodically based on the period. For example, the random waiting time is a time between 0 and 60 seconds, and the transmission period may be 5 minutes, 10 minutes, 30 minutes, 60 minutes, and the like. The random waiting time may be less than one tenth of the transmission period.

For example, when a power outage occurs in a specific region where the LoRa communication module 100 is installed and power is restored, a plurality of information collection units including the LoRa communication module 100 may operate simultaneously and transmit data signals simultaneously. . That is, power can be turned on at the same time to the information collection units installed in a specific area. For another example, information collection units may transmit data signals at a specific time.

In this case, the Laura gateway and the server (that is, a monitoring server that determines whether or not a failure occurs by finally receiving a sensing signal) are overloaded, and at least a portion of the data signal may be lost. In the LoRa communication module 100, since there is no response from the Laura gateway or the server, it is considered that the transmission of the data signal has failed, and the retransmission of the data signal can be repeatedly attempted. In this case, the gateway and the server may be more overloaded.

Accordingly, the LoRa communication module 100 according to embodiments of the present invention may apply a random waiting time when the LoRa communication module 100 is initially executed.

For example, the LoRa communication module 100 may output a reset signal, and may output a reset signal having a first voltage level (for example, an enable state) during initial booting according to an initial setting value. . In this case, the standby time setting unit 129 may set a random standby time in response to the reset signal of the first voltage level. That is, the waiting time setting unit 129 may randomly select a waiting time between 0 and 60 seconds.

For example, when the LoRa communication module 100 is booted at 00:00:00 and the standby time is set to 15 seconds by the standby time setting unit 129, the communication unit 130 is at 00:00:15 Data signals can be transmitted.

Thereafter, when the transmission of the initial data signal is successfully performed, the communication unit 130 may transmit the data signal for each predetermined transmission period based on a time point at which the initial data signal was successfully transmitted. For example, when the transmission cycle is set to 20 minutes, the communication unit 130 is based on 00: 00: 15 15, the first data transmission time, 00: 20: 15, 00: 40: 15, 01: 00 Data signals can be transmitted to 00 minutes and 15 seconds.

In one embodiment, the wait time setting unit 129 receives a data reception confirmation signal corresponding to the transmission of a data signal from the access panel 20 (or a Laura gateway, a monitoring server), according to a preset update cycle. The random waiting time can be updated. Here, the control unit 120 outputs a reset signal having a first voltage level until a data reception confirmation signal is received, and when receiving a data reception confirmation signal, a control signal having a second voltage level or a reset off signal is received. It can be generated and printed. In this case, the standby time setting unit 129 may stop the operation (or generation and output of a random standby signal) based on the reset off signal.

In one embodiment, the communication unit 130 may transmit data at any time within a reference time range in a transmission period after the data signal is initially normally transmitted. For example, the communication unit 130 may transmit a data signal in an arbitrary section of -10 to +10 seconds at a preset time.

After the previous data transmission is completed, the communication unit 130 may wait for the transmission of the next data for a random time. That is, the communication unit 130 may wait for the previous data to be transmitted and wait for 10 to 15 seconds after the previous data transmission to transmit the next data when continuous data is transmitted. For example, when the server message transmission occurs at 12:12:10 and 12:12:12, the communication unit 130 randomly transmits the first event between 12:12:20 ~ 25 seconds, and the next data After the previous data transmission is over, 10 seconds to 15 seconds can be additionally waited before transmission.

As described with reference to FIG. 6, the LoRa communication module 100 may avoid a simultaneous transmission with other LoRa communication modules by giving a random waiting time at least once during initial operation or periodic data transmission. Also, the LoRa communication module 100 may transmit a data signal while arbitrarily changing a transmission period between allowable time ranges (for example, -10 seconds to +10 seconds) even during periodic transmission according to a transmission period. Therefore, it is possible to reduce the load on the Laura gateway and the server due to the simultaneous transmission of data signals of the LoRa communication modules.

7 is a view showing an example of transmitting a data signal from the information collection unit. 7 shows a process in which data signals are transmitted from a plurality of information collection units 100_1, 100_2, and 100_3 over time. The information collection units 100_1, 100_2, and 100_3 may be installed in the same area and connected to the same Laura gateway.

Referring to FIG. 7, the first information collection unit 100_1 transmits a data signal at 0 seconds, and receives a data reception confirmation signal ACK corresponding thereto, and accordingly, a transmission period (TC) based on 0 seconds ), data signals may be periodically transmitted to the first time point T1, the second time point T2, and the like.

The second information collecting unit 100_2 transmits a data signal at a third time point T3 avoiding 0 seconds according to the set first random waiting time T_RAN1, and receives a corresponding data reception confirmation signal ACK The data signal may be periodically transmitted to the fourth time point T4, the fifth time point T5, etc. based on the transmission period TC based on the third time point T3.

The third information collection unit 100_3 transmitted the data signal at the third time point T3 according to the set first random waiting time T_RAN1, but the second information collection unit 100_2 and the transmission time point of the data signal are overlapped. , It may not be able to receive the data acknowledgment signal (ACK). In this case, since the reset signal maintains the first voltage level (or enable state), the standby time setting unit 129 updates the random standby time to the second random standby time (T_RAN2), and the third information collecting unit (100_3) may transmit a data signal at the sixth time point (T6). Thereafter, upon receiving the data reception confirmation signal ACK, the third information collecting unit 100_3 transmits a data signal to the seventh time point T7 or the like based on the transmission period TC based on the sixth time point T6. Can be sent periodically.

8 is a diagram illustrating an example of the photovoltaic device of FIG. 1.

1 and 8, compared with the photovoltaic device 1 of FIG. 1, the photovoltaic device 1_1 of FIG. 8 further includes a modular receiver 20_1 (or a modular receiver) It can contain.

The modular receiver 20_1 may receive a data signal transmitted from the LoRa communication module 100 through Laura wireless communication. The modular receiver 20_1 is coupled to a portable terminal 50 such as a smart phone, PDA, or tablet PC in a detachable state to transmit detection result data received from the outside to the portable terminal 50.

The modular receiver 20_1 is formed to include a terminal for data transmission, so that the terminal for data transmission can be coupled to a data transmission cable coupling groove formed in the portable terminal 50, and the portable terminal 50 is a modular receiver ( 20_1) can receive the detection result and output it to the screen. Here, the portable terminal 50 may be a terminal possessed by an operator who manages a photovoltaic device in the field.

The portable terminal 50 may store the detection result received from the modular receiver 20_1 in the storage space of the portable terminal 50.

The present invention can be applied to a photovoltaic power generation management system, a failure diagnosis device for a photovoltaic power generation system, and the like.

As described above, the present invention has been described with reference to embodiments of the present invention, but those having ordinary skill in the art may vary the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. It will be understood that modifications and changes can be made.

1: Solar power device
10: solar cell array
20: connection panel
30: display

Claims (4)

A solar cell array composed of a plurality of solar cells;
Sensors for detecting the state of the solar cell array-temperature sensors and humidity sensors arranged in a space formed between the solar cells to measure the temperature and humidity of the solar cell array, and disposed outside the solar cell array Wind direction sensor, wind speed sensor, and vibration sensor;
A LoRa communication module disposed on one side of the solar cell array, receiving a signal detected from the sensors, and converting the detected signal and a unique identification number of the solar cell array into wireless data for transmission;
A connection panel that receives the wireless data; And
It includes a modular receiving device for receiving the wireless data transmitted from the LoRa communication module, coupled to a portable terminal detachably to deliver the wireless data to the portable terminal,
The LoRa communication module,
An analog-to-digital converter that converts the detected signal into a digital signal;
A controller configured to collect the digital signals converted by the analog-to-digital converter into one data according to a set order, and to time-divide the collected data to enable identification of the collected data;
A memory for temporarily storing the collected data signal;
A communication unit wirelessly transmitting the aggregated data signal; And
It includes a waiting time setting unit for setting a random waiting time during the initial driving,
The communication unit delays the wireless transmission of the data signal during the random waiting time, and the communication unit first transmits the data signal at a first time point after the random waiting time, and at a predetermined transmission cycle based on the first time point. Based on this, the data signal is periodically wirelessly transmitted,
The standby time setting unit operates in response to a reset signal output during the booting process of the controller,
The waiting time setting unit updates the random waiting time according to a preset update period until a data reception confirmation signal is received from the access panel through the LoRa communication module,
The control unit generates a reset off signal based on the data reception confirmation signal,
The standby time setting unit stops the operation based on the reset off signal,
The communication unit includes a first class that transmits downlink data only when uplink data is received, a second class that uses a beacon for synchronization with the access panel to check for periodic downlink data, and even when not transmitting, To make this possible, one of the third classes that always opens and receives the transmission/reception channel is selected to form a protocol,
The connection panel determines whether or not there is a failure for each unit solar string, analyzes the power loss of the unit solar string where the failure occurs, and analyzes the output voltage of the unit solar string equal to the output voltage of the other unit solar string. Solar power generation device, characterized in that to control the output so as to step up.

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