KR20240003470A - Solar power plant with wireless automatic module power cut-off function by earth leakage detection - Google Patents

Abstract

The present invention initially detects and spreads electrical accidents due to poor connection, insulation breakdown, or electric leakage in the positive (+) or negative (-) wiring line or related equipment in the direct current power circuit that transmits the power generated from the solar module to the inverter. In order to prevent this in advance, the magnetic flux of the positive (+) and negative (-) currents of the DC circuit are canceled out, and a sensor is connected to measure the leakage current due to the remaining magnetic flux difference. It is measured at the front end, which may affect the human body. When a leakage current of more than 20mA occurs, a blocking signal is transmitted wirelessly, and DC power is wirelessly received from a blocking relay installed near the module, including an automatic blocking function, notification function, and monitoring function to prevent electrical accidents caused by electric leakage. This relates to a solar power generation device that has a wireless automatic shutdown function through earth leakage detection that can realize early suppression, prevent the spread of electrical accidents, and minimize damage to people and property.

Description

Solar power plant with wireless automatic module power cut-off function by earth leakage detection}

The present invention relates to a solar power generation device having an electric leakage detection function to prevent the spread of electrical accidents due to electric leakage and to minimize casualties, a wireless module power automatic and manual cutoff function, and a notification function. More specifically, it relates to a solar power module. In the event of a short circuit due to insulation breakdown or ground fault in the positive (+) or negative (-) distribution line of the DC power equipment that transmits the power generated from A safe solar system that automatically cuts off the installed blocking relay wirelessly and disconnects itself from the electric system to prevent insulation breakdown, electrical accidents, casualties, and electrical fires, and has a wireless automatic module power cutoff function that features prompt leakage notification. It is about photovoltaic devices.

Solar power generation generates electricity by irradiating light energy to solar cells (modules) made of semiconductors and converting the light energy into direct current electricity. It uses unlimited and pollution-free solar energy, so there are no fuel costs and no air pollution. It generates little waste, has no mechanical vibration and noise, has a long lifespan of at least 25 years, and is easy to maintain.

In general, a solar power generation system includes a solar module that generates direct current electrical energy, a connection box that collects the direct current power from several circuits generated by the solar module into a single direct current power source to transfer it to an inverter, and converts the direct current power into alternating current power. It includes an inverter that converts the AC power, and the AC power converted by the inverter is connected to the power grid system through a separate AC distribution board and supplied to the premises or customers for use.

Since the amount of electrical energy generated from a unit solar cell is very small, several solar cell groups are usually manufactured as modules. In addition, multiple solar modules are arranged in series to form an array, and these array groups are reorganized into modules. By combining them in parallel, the necessary power is secured by connecting a single circuit DC power source.

The junction box is composed of a DC output switch or circuit breaker, lightning protection element, fuse, etc., and performs the function of collecting the DC power generated from multiple solar modules into one circuit and transmitting it to the inverter. It is usually installed near the outdoor module. Therefore, as long-term operation occurs in harsh conditions such as rain and high temperature environments, there is always a high possibility of electric leakage accidents, and most of the defects in the solar power generation system currently in operation occur in the wiring between the module and the connection box. This is the situation.

These photovoltaic power generation devices have various electrical components and wiring complexly arranged, so there is a high risk of overheating due to poor contact, electric leakage, disconnection, arcing due to short circuit, and insulation breakdown due to deterioration of the insulating coating material. It can easily spread through electrical fire.

In addition, there is a need for constant monitoring of accident-causing conditions that are fatal to electrical safety, such as electric current, ground fault, and short-circuit of the module's DC power and DC distribution equipment. However, due to continuous power supply and connection to the existing power system, insulation resistance was measured regularly by separating the circuit from the power supply. Although safety was determined, it is difficult to respond to the unexpected occurrence of accidents, so facilities with a constant monitoring function for leakage current in the DC system are required.

In addition, since solar modules or junction boxes are installed outdoors, it is not easy to repair them quickly even if a short circuit is recognized. In the event of an electrical fire due to heat generation due to a short circuit, early extinguishment is very important, and even after a fire occurs, the solar module continues to operate. There was a problem that could not be easily extinguished due to the influx of direct current power.

When an electrical accident occurs, damage to property and human life is very significant, so the most important thing is an early detection function for electrical accident elements such as leakage current, a module that continuously produces power as long as the sun is present, and a wireless direct current power cutoff device nearby. There is an urgent need to develop a DC leakage current detection system for each circuit just before it is input into the junction box.

The present invention is intended to solve the difficult problem of detecting and responding to electric leakage accidents that may occur at any time in the past management form where a conventional professional technician turns off the power and regularly inspects it with a portable measuring instrument. The polarity and size of the DC distribution line from the module to the inverter are detected for each circuit, and when a leakage current exceeding the set value occurs, a signal is sent wirelessly to connect to the module, or the module is connected to the module at a point as close to the module as possible in the DC circuit between the inverters. By creating an operating power source near the module to cut off the power, the module power is automatically cut off for each circuit without separate wiring for the cut-off operating power supply. It is also shut off manually, and automatic notification measures are taken to prevent the spread of load facility failures due to electric leakage accidents. The purpose is to provide a safe and convenient solar power generation device with a wireless automatic shutdown function of module power that can prevent secondary electrical accidents, prevent electrical fires, completely suppress initial fire, and prevent spread.

In order to achieve the above object, the present invention provides a solar module array (100) in which a plurality of solar modules that receive sunlight and generate direct current power are connected in series and several direct current constituting the solar module array (100). A junction box 400 and the solar module are configured to install fuses to block the circuit in the event of overcurrent in the positive (+) and negative (-) power circuits, combine them into one DC power circuit, and transmit the power to the inverter through a circuit breaker. An earth leakage detection box (300) is located between (100) and the connection box (400) and is installed near the connection box (300) to transmit the direct current power of the solar module (100) to the connection box (400). ) According to the information of the leakage current sensor 310, automatic information or manual information on the occurrence of leakage current abnormality harmful to the human body is sent as a wireless signal to the blocking operation instruction unit 270 through the wireless receiver 290, and the solar module array 100 ) of DC power is composed of a shunt coil (210) and a blocking relay (230) that automatically blocks various DC circuits supplied to the connection box (400) or inverter (500) and is installed in a location close to the module from which the generated power is generated. A module blocking box (200), where the operating power of the shunt coil (210) of the blocking relay (230) of the module power box (200) is an operating power unit that converts and supplies the generated power of the nearby operating power solar module (150). Includes support from (250).

In order to wirelessly transmit an automatic blocking signal to the module blocking box (200), the DC power circuit cable of the module array is installed through the leakage current sensor (310) to detect leakage current, and when the information of the leakage current sensor is above the set value or manually An earth leakage detection box 300 consisting of an earth leakage detection module 330 that emits a blocking signal and a warning light signal according to the signal, a manual button 370, and a warning light unit 350; In addition, the current of the inverter 500 and the inverter 500, which converts the DC power collected into one circuit of the solar module array 100 into AC power for use at actual load by linking it with the existing power system, The direct current sent from the solar module 100 to the inverter 400 is composed of a monitoring system 600 that can monitor power information such as voltage and leakage current information of the earth leakage detection box 300 from a remote location such as a central monitoring room. It monitors signs of electrical accidents such as electric leaks, ground faults, and short circuits on distribution lines, and automatically or manually receives signals wirelessly from the module blocking box (200) installed near the module to block them, preventing electrical accidents and spreading of electric leaks. We provide a solar power generation device with a wireless automatic cut-off function for module power through detection.

At this time, in order to measure the leakage current of a DC circuit, when a CT and a conductor, which generate a magnetic flux equal to the size of the current passing through the circular iron core, are placed in a magnetic field and a current flows in a direction perpendicular to the magnetic field, the magnetic field perpendicular to both the magnetic field and the current It is characterized by measuring the leakage current with a leakage current sensor 310 composed of a Hall element using the Hall effect in which a potential difference occurs in one direction.

In addition, the direction and size of the leakage current is measured with the leakage current sensor 310, the information is used to set the leakage current in the 20mA range that is safe for the human body, and the measured value is compared with the set value to send a blocking signal and a manual signal, and leakage current information is used for monitoring. An earth leakage detection module 330 that transmits and issues an alarm signal, a wireless transmitter 390 that wirelessly transmits an earth leakage detection blocking signal and a manual blocking signal to the module blocking box 200, and a manual button that can manually give a blocking signal. (370), and is characterized by an earth leakage detection box (300) that includes a notification unit (350) that notifies the outside of the occurrence of leakage current and abnormal situations in the electric circuit.

The wireless blocking signal from the earth leakage detection box 300 installed near the connection box 300 is transmitted to the shunt coil 210 via the wireless receiving unit 290, thereby transmitting the direct current power generated from the solar module array 100. A module blocking box (200) consisting of a blocking relay (230) that automatically blocks and an operating power unit (250) that converts the generated power of a nearby operating power solar module (150) for operating power and supplies it to the shunt coil operating power. It is characterized by .

At this time, the breaker 430 with a built-in shunt coil of the connection box 400 can optionally be blocked using an automatic or manual blocking signal from the earth leakage detection module 330 of the earth leakage detection box 300.

In addition, the leakage current sensor (310) of the earth leakage detection box (300) can be installed in each series circuit of the module, and the blocking relay (230) for each circuit, which can respond to detailed accident circuits, can be blocked, so that only the accident circuit can be operated separately. There is also an economic effect.

According to an embodiment of the present invention, the following effects are achieved.

First, it is possible to monitor signs of electrical accidents or electrical fires, such as electric leaks, ground faults, and short circuits in DC distribution lines or facilities, and quickly block the spread of DC power generated by solar modules to initially extinguish accidents or fires.

Second, physical damage and human damage can be prevented or minimized by quickly shutting off direct current power.

Third, by monitoring and blocking signs of electrical accidents or electrical fires such as electric leaks, ground faults, and short circuits in DC distribution lines or facilities, the cost of restoring facilities is reduced by quickly extinguishing accidents and minimizing burnout, and the recovery period is shortened, resulting in a decrease in power generation. can be minimized.

Fourth, it has the effect of preventing the spread of fire, which could result in a major accident, and preventing the risk of fatal accidents such as electric shock and toxic gas poisoning.

In conclusion, it first detects the initial state of an electrical accident such as a short circuit or ground fault in a DC circuit, warns of the situation, protects the system by blocking the DC power supply at a location close to the solar module, and reduces recovery costs by minimizing the spread of damage. , can provide a safe and economical solar power generation system that shortens recovery time.

In addition, the operating power for blocking DC power is supplied from the solar module, so there is no need for a distribution line from the commercial power source, and it operates only when the solar module generates power, ensuring stable operation of the solar power generation facility and reducing power consumption and wiring installation costs. It is very economical in terms of

1 is a diagram showing the configuration of a general solar power generation system according to an embodiment of the present invention.
Figure 2 is a diagram showing the configuration of a solar power generation device that wirelessly cuts off module power by detecting an earth leakage according to an embodiment of the present invention.
Figure 3 is a diagram showing the configuration of a Hall effect and leakage current sensor according to an embodiment of the present invention.
Figure 4 is an actual photo of a leakage current sensor and an earth leakage detection module according to an embodiment of the present invention.
Figure 5 is a diagram showing the effect of energized current on the human body according to an embodiment of the present invention.
Figure 6 is a photograph and configuration drawing of a direct current relay according to an embodiment of the present invention.
Figure 7 is a diagram showing the configuration of an operating power circuit according to an embodiment of the present invention.
Figure 8 is a diagram of a wireless communication configuration according to an embodiment of the present invention.

A preferred embodiment of the present invention will be described in detail with the accompanying drawings as follows. The terms used in this specification are merely used to describe specific embodiments and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, terms such as "comprise" or "have" are intended to designate the presence of implemented features, numbers, steps, operations, components, parts, or combinations thereof, but are intended to indicate the presence of one or more other features or numbers, It should be understood that this does not exclude in advance the possibility of the presence or addition of steps, operations, components, parts, or combinations thereof.

As such, the terms used in the present invention are general terms that are currently widely used as much as possible, but in certain cases, there are terms arbitrarily selected by the applicant, and in this case, the meaning is described in detail in the description of the relevant invention, so it is a simple term. We would like to make it clear that the present invention should be understood by the meaning of the term, not by its name. In addition, when describing the embodiments, description of technical content that is well known in the technical field to which the present invention belongs and that is not directly related to the present invention will be omitted. This is to convey the gist of the present invention more clearly without obscuring it by omitting unnecessary explanation.

1 is a diagram for explaining an embodiment of a general solar power generation system according to the present invention. As shown in FIG. 1, an embodiment of a general solar power generation system connects a plurality of solar module arrays 100, a connection box 400, and an inverter 500 in series with the power system to supply power to the load. It is composed. Here, the plurality of solar module arrays 100 receive sunlight and generate direct current power. In the present invention, the connection box 400 includes a fuse 410 for circuit protection when overcurrent flows by forming a circuit in series with the solar module array 100 in a certain number within the voltage range at which the inverter 500 can operate. An array is formed by installing on the + pole and - pole, and several parallel groups of the same voltage array configured in this way are gathered into one DC circuit and supplied to the inverter 500 through the breaker 430, and the inverter 500 provides power. It is converted into AC power that can be connected to the grid and supplied. At this time, the junction box and the inverter are electrically connected through wiring tens to hundreds of meters from the module, and electrical accidents occur due to insulation deterioration and electric leakage in this wiring.

Figure 2 is a diagram of the configuration of a solar power generation system that wirelessly cuts off DC module power by detecting electric leakage according to an embodiment of the present invention. There are several additional configurations to Figure 1 to prevent electric leakage in the DC circuit after the solar module array 100. We constructed a solar power generation system that can detect electrical accidents such as insulation deterioration or ground faults at an early stage and automatically shut off the direct current circuit.

In order to prevent the occurrence or spread of electrical accidents such as electric leaks or fires resulting from electric leaks in the electric line from the module array (100) to the connection box (400), if leakage current exceeds a level that is harmless to humans occurs, the DC circuit located close to the module should be disconnected. A shunt coil (210) and a blocking relay (230), which are trip operation coils for blocking, a wireless receiver (290) that wirelessly receives a blocking signal based on leakage current information, and a blocking operation instruction unit ( 270), an operating power unit ( In order to measure the leakage current of the DC circuit supplied from the module blocking box (200) and the module to the connection box (400), the magnetic flux directions of the + and - poles generated by simultaneously penetrating the + and - pole wires through the CT. The circular or square leakage current sensor 310, which can measure the leakage current by canceling each other out and the remaining magnetic flux difference, quantifies the information of the leakage current sensor and sets it in the range of 20mA or less, which is harmless to the human body, and blocks the module when the set value is exceeded. 200) and the circuit breaker 430 of the connection box 400 emits a blocking signal and a warning light signal, and also sends a manual blocking operation signal by a manual button, and transmits leakage current information and blocking status information to the monitoring 600. It has an earth leakage detection module 330, a wireless transmitter 390 that wirelessly transmits the blocking signal of the earth leakage detection module to the wireless receiver 290 of the module blocking box 200, and a manual button that instructs the earth leakage monitoring module to receive a manual blocking signal. (370), a solar power generation device that has a wireless auto-blocking function of module power by detecting an earth leakage, including an earth leakage detection box (300), which consists of an electric light unit (350) that visually and audibly notifies the surrounding people when the leakage current exceeds the set value. am.

In addition, a number of DC power generation circuits equipped with a fuse 410 for circuit protection of the solar module array 100 input through the earth leakage detection box 300 are gathered into a single DC circuit, and a circuit breaker 430 installed before output is used. The connection box 400, which includes a shunt coil 210 for automatic disconnection, and a single DC power input from the connection box 400 are converted into commercial AC power to supply to the load system and connected to the power system. An inverter 500 was also configured. At this time, the operation of the shunt coil 210 of the circuit breaker 430 in the junction box 400 may be omitted because there is a risk that it may overlap with the blocking of the module blocking box 200.

In addition, the module blocking box (200) is installed close to the module to cut off the source in the event of an electrical accident such as a short circuit, and blocks it with its own operating power for this purpose, eliminating the need for wiring from commercial power for operating power and allowing the installation location near the module to be freely selected. There is an advantage.

Figure 3 is a configuration diagram of a leakage current detection sensor for detecting leakage current according to an embodiment of the present invention. It is a diagram to explain the Hall effect and is a diagram of a configuration that can measure direct current leakage current by combining a magnetic core method and a Hall element. When the chain anode (+) and cathode (-) wires penetrate the magnetic core, the magnetic flux equal to the difference in current size of the anode (+) or cathode (-) remains after canceling out the polarity of the anode (+) or cathode (-). When the magnetic flux acts on this Hall element, a Hall voltage due to the Hall effect appears, and the Hall voltage is amplified by inducing an extremely low voltage, allowing the leakage current of the anode (+) or cathode (-) to be measured.

Here, the Höl effect means that when a magnetic field H _z is applied perpendicularly to a thin metal or semiconductor plate through which a current I _x flows in the _x direction, an electromotive force E _y is generated in a direction perpendicular to H _z and I It is called the effect or electric current effect. It was discovered in 1879 by American physicist EH Hall. This is due to the fact that the carrier carrying electricity receives the Lawrence force in a direction perpendicular to the current and magnetic field, and its movement is bent.

_{When I _ _ _} That is, R _H is given as R _H = _{E Y} /( _I If the plate thickness is t [m], the hole voltage is V _H [V], the current is I [A], and the magnet density is B [Wb/㎡], the previous equation is R _H =tV _H /(IB)x10 ² ［ ㎥/C], and the hole coefficient is inversely proportional to the carrier density and is affected by the type of material and temperature.

Figure 4 shows the configuration of a leakage current sensor and a leakage detection module according to an embodiment of the present invention, and is a photo of the actual product developed and installed. The lower part is a leakage current sensor 310 that penetrates each DC power + and - circuit, and the upper part is a leakage current. This photo shows two 4-circuit earth leakage detection modules (330) that receive information from the sensor, display the current leakage current, set the leakage current for a cutoff signal, and emit a cutoff signal along with an alarm signal when the set value is exceeded. The earth leakage detection module 330 consists of an electronic circuit, and the coding in the MCU (Micro Controller Unit) includes variables, Lpf algorithm, ADC chip initialization, sensing timer, PV voltage reading 0-3 channels, sensing control, definition, and variable declaration. , structure declaration, UART interrupt, Tim2 system timer interrupt, Main operation, communication unit, variable, 1ms timer, Uart interrupt, Modbus error data sorting, Modbus data sorting, Modbus data analysis, Uart Main process coding. Runs . As an example, the coding for Modbus data analysis is as follows.

Figure 5 is a diagram showing the effect of leakage current of Korea Occupational Safety and Health Agency data on the human body according to an embodiment of the present invention. This is a curve related to leakage current [mA] and energization time [ms]. AC-1 is a state where 0.5 [mA] flows, which is unresponsive to the human body, and AC-2 is a state where there is no harmful physiological effect, but a slight tingling sensation is present. It is a level that flows for 2000[ms] at [mA], a graph that flows for 500[ms] at 20[mA], and 50[ms] at 50[mA], and AC-3 is 50[ms], which is beyond the range of AC-2. [mA] is the range that flows for 1000 [ms], which is the level at which spastic muscle contraction or breathing difficulties are possible, and AC-4 is the range where pathophysiological symptoms such as cardiac arrest, respiratory arrest, or severe burns can occur. This chart can be used as a reference to determine the range that is harmless to the human body for detecting leakage current in a solar power generation device and blocking the circuit, and is based on the technical standards and judgment standards of the Ministry of Trade, Industry and Energy's Notice No. 2020-659 (December 13, 2020). The ground fault current of the power generation device is 30 [mA] and is set to be cut off at less than 300 [ms]. In this solar power plant, the leakage current is detected and the circuit is cut off. The range that is harmless to the human body is from 20 [mA] to less than 1 [s]. It is desirable to decide.

Figure 6 is a diagram showing the configuration of a direct current blocking relay according to an embodiment of the present invention along with an actual installation photo. It is a diagram showing the possibility of an electrical accident such as a short circuit or a fire due to this in the electric line from the solar module array 100 to the connection box 400. To prevent spread, the shunt coil (210) and blocking relay (230), which are trip operation coils that block one line of the DC circuit located near the module when a leakage current exceeds a level harmless to humans flows and a short circuit occurs, operates on a shunt coil. When operating power is applied to the coil, an electromagnetic field is generated in the shunt coil, causing the movable core to rise and come into contact with the movable and fixed contacts to conduct current. When the contacts are separated, an arc is generated between the contacts. A permanent magnet is moved to the left and right of the contacts. It is configured on the outside and moves the arc generated between contacts in the direction of the arc chamfer using Fleming's left hand rule. At this time, the arc is cooled and extinguished by the hydrogen in the chamfer, which has the advantage of minimizing contact damage by shortening the DC blocking arc extinguishing time.

Figure 7 is a diagram showing the configuration of an operating power circuit according to an embodiment of the present invention, and shows the shunt coil 210 driving power for blocking operation of the blocking relay 230 in the module blocking box 200 installed near the solar photovoltaic module. It relates to an operating power unit 250 that supplies power to drive a blocking operation instruction unit 270 that instructs a blocking command by a blocking signal and a wireless receiving unit 290 that receives a blocking signal, and is a solar module dedicated to a small amount of operating power. This is an example of a circuit configuration including a DC-DC converter and a fuse that receives a certain amount of direct current power from (150) and converts it into direct current voltage power that can drive the shunt coil (210).

Figure 8 is a diagram showing the wireless communication configuration according to an embodiment of the present invention along with an actual installation photo. A blocking signal by a leakage current sensor and a manual button is determined by the earth leakage detection module 330 and the blocking signal is sent to the wireless transmitter 390. It relates to wireless communication used to receive data from the wireless receiver 290 wirelessly. It is a security protocol that is a standard for sending and receiving data through a 2.4 GHz wireless link, and Bluetooth allows wireless connection of devices over a short distance, low power, and low cost. Use . In particular, it is the best protocol for sending and receiving relatively small data over short distances (<100m) and can replace wired serial communication interfaces with wireless ones. A standard has been created so that Bluetooth can operate separately from other protocols in the unlicensed ISM frequency band - the 2.4GHz frequency band, which is the RF (Radio Frequency) band also used by ZigBee and WiFi. The transmitting unit of wireless communication receives an input signal as shown in the circuit diagram of FIG. 8 and transmits information through the following six processes.

1. Drive amplifier - Function to amplify the input signal for driving

2. Band select filter - Function to remove unnecessary frequency components

3. Power Amplifier - Amplifies to send a signal with sufficient power to the final stage.

4. Isolator - A function that prevents the reverse inflow of signals and allows them to flow only in the output direction.

5. Band select filter - Function to remove unnecessary frequency components

6. Antenna - Ultimately, radiates electrical signal changes as electromagnetic waves in the air.

The wireless communication receiver receives the input signal from the transmitter as shown in the circuit diagram of FIG. 8 and receives information through the following 11 processes.

1. Antenna - Receives electromagnetic wave signals in the air and transmits them as electrical changes on the conductor.

2. Band select filter - A function to remove unnecessary frequency components received from the antenna.

3. Low noise amplifier - Amplifies the signal while suppressing the received low noise.

4. Image reject filter - Image frequency mixing prevention filter function

5. RF down mixer - Function to downconvert and synthesize radio frequencies (RF 100KHz~300GHz) to intermediate frequencies (IF 300Hz~10MHz).

6. RF local oscillator - supplies LO frequency required for channel selection

7. Phase locked loop - Role of fixing at a certain frequency

8. Channel select filter - Role of selecting only desired channels

9. IF amplifier (intermediate frequency amplifier) - signal amplification role

10. IF down mixer - Down mixing to convert to baseband containing the original signal

11. IF local oscillator - supplies LO frequency to IF downward mixer

Communication in the radio frequency band configured in this way allows for 1:1 communication and 1:N communication as shown in FIG. 8, and an electronic circuit is constructed based on this principle and coded for driving in an MCU (Micro Controller Unit).

Although the present invention has been described with the above examples, the present invention is not necessarily limited to these examples, and various modifications may be made without departing from the technical spirit of the present invention. The scope of protection of the present invention shall be interpreted in accordance with the claims below, and all technical ideas within the equivalent scope thereof shall be construed as being included in the scope of rights of the present invention.

100: solar module array
150: Operating power solar module
200: Module blocking box
210: shunt coil 230: electronic relay
250: operating power unit 270: blocking operation instruction unit
290: wireless receiver
300: Earth leakage detection box
310: Leakage current sensor 330: Earth leakage detection module
350: Lighting unit 370: Manual button
390: wireless transmitter
400: Connected
410: Fuse 430: Breaker/Switch
500: Inverter
600: Monitoring

Claims (5)

A solar module array 100 made of P-type semiconductors and N-type semiconductors and connected in series to configure a voltage at which an inverter can operate solar modules that convert solar light energy into electrical energy and generate direct current power;
A fuse 410 that blocks the circuit in the event of overcurrent is connected to the positive (+) and negative (-) circuits of the solar module array 100 and combined into one DC power circuit to create a circuit breaker 430. A connection box (400) configured to transmit the data to the inverter (500) via;
In transmitting the DC power of the solar module array 100 to the connection box 400 for each circuit, a circular or square leakage current sensor 310 and leakage detection information are used to detect electric leakage occurring in the electric line for each DC circuit. An earth leakage detection module 330 that emits a blocking signal by comparing it with the set value, a wireless transmitter 390 that transmits the blocking signal wirelessly, a manual button 370 that can manually give a blocking signal, and an audio-visual device around when the blocking signal is received. An earth leakage detection box (300) including a warning light unit (350) that notifies the enemy;
A wireless receiver 290 that wirelessly receives the cut-off signal from the earth leakage detection box, a cut-off operation indicator 270 that instructs cut-off operation based on the wireless reception information, and a contact operation coil for cut-off operation for each DC circuit according to the cut-off instruction. A module blocking box installed near the module, including a shunt coil (210), a blocking relay (230) that switches one line with a moving contact and a fixed contact, and an operating power unit (250) that supplies operating power to the shunt coil (210). (200);
An inverter (500) that converts the solar power generation DC power of the junction box (400) into commercial AC power to supply to the load;
And a monitoring (600) that monitors the inverter's direct current voltage, output alternating voltage, current, power information, leakage current information, and blocking information from a remote management office; It is composed of a solar power generation system that monitors signs of electrical accidents due to electric leakage in the DC distribution line and automatically or manually blocks only the fault circuits near the module. It is characterized by a solar power generation system that has a wireless auto-shutoff function for module power through earth leakage detection. Device According to claim 1, in order to measure the leakage current of a direct current circuit, a hole installed in a magnetic core and a portion of the magnetic core in which a magnetic flux is formed equal to the difference between the anode (+) and cathode (-) currents penetrating through the circular or square iron core. When a conductor is placed in a magnetic field in an element and a current flows in a direction perpendicular to the magnetic field, a direct current circuit is formed using a leakage current sensor 310 that measures leakage current using the principle that a potential difference is generated in a direction perpendicular to both the magnetic field and the current. A photovoltaic power generation device with a wireless automatic cut-off function for module power through earth leakage detection, which is characterized by monitoring the risk of electrical accidents, such as the state of insulation. According to paragraph 1,
The information obtained by measuring the polarity and size of the leakage current is quantified using the leakage current sensor 310, and the size is set to 20 mA or less, which is harmless to the human body. Comparison is made and a blocking signal is issued when the set value is exceeded or by a manual signal using the manual button 370. and an earth leakage detection module (330) that emits an alarm signal,
1:1, 1:N, and N:N communication is possible using the short-distance communication method for the blocking signal of the earth leakage detection module 330, and RF (Radio Frequency) in the 2.4GHz band modulates and transmits and demodulates transmission information using radio waves. A solar power generation device with a wireless auto-blocking function for module power through earth leakage detection, featuring a wireless transmitter 310 that transmits wirelessly using Bluetooth or Wifi communication and a wireless receiver 290 that receives wirelessly. When operating power is applied to the shunt coil 210, an electromagnetic field is generated in the shunt coil 210, the movable core rises, the movable contact point and the fixed contact point come into contact, causing current to pass, and when the contact points are separated, an arc occurs between the contact points. Permanent magnets are formed on the left and right outside of the contact point to form a magnetic field, and the arc generated between the contact points is moved in the direction of the arc chamfer based on the principle that force is generated in the direction perpendicular to the current and magnetic field. At this time, the arc is cooled and extinguished by the hydrogen in the chamfer to generate direct current. A photovoltaic power generation device with a module power wireless automatic cut-off function through earth leakage detection including a single-line blocking relay (230) that minimizes contact damage by shortening the cut-off arc extinguishing time. A solar module (150) dedicated to a small amount of operating power is used to supply power to operate the shunt coil (210) that operates the blocking relay of the module blocking box (200), the blocking operation indicator (270), and the wireless receiver (290). ), which receives a type of direct current power from ) and converts it into direct current voltage power that can drive the shunt coil (210). It is a wireless module power module with an earth leakage detection that has an operating power unit (250) featuring a circuit configuration including a fuse and a DC-DC converter. A solar power generation device with an automatic shutdown function.