KR102219474B1 - Solar power generation system without electric shock - Google Patents

Abstract

A solar power generation system without electric shock according to the present invention comprises: two or more power lines electrically connected to a solar panel to transmit electricity generated from the solar panel to a load or a power system, and insulated with a resistance value greater than a predetermined ground resistance value from an earth; and one or more fault detectors electrically connected between at least one of neutral points having a potential between voltages of two or more power lines and the two or more power lines and the earth. The fault detector detects a leakage current flowing to the earth from two or more power lines or the neutral points to output a detection signal. Therefore, the present invention may detect and block a leakage current between a power line for transmitting DC or AC for configuring the solar generation system and the earth to prevent the occurrence of electric accidents (ground fault, short, electric shock, fire, and blackout) due to the leakage current.

Description

Solar power generation system without electric shock

The present invention relates to an electric shock-free solar power generation system, and more particularly, by detecting a leakage current between the ground and a power line transmitting DC or AC constituting the solar power generation system and blocking the leakage current, It relates to an electric shock-free solar power generation system that can prevent the occurrence of electric accidents (ground fault, short circuit, electric shock, fire, blackout, etc.).

In general, various power generation systems for converting renewable energy into electrical energy have been developed, but among them, a solar cell module that converts sunlight into electrical energy and a solar power generation system using the same have recently been in the spotlight.

However, since such a solar power generation system is disposed and operated outdoors, it is directly exposed to an external climate or environment, and thus, damage or aging of the solar cell module or line constituting the solar power generation system is likely to occur. In particular, various problems such as damage or aging of the line occur in a DC power line connected to a load or an inverter from a solar panel composed of a plurality of solar cell modules, or an AC power line that provides generated power from the inverter to the load or power system.

Due to this problem, leakage current due to ground fault or electric leakage occurs due to various factors such as deterioration due to external exposure of the solar cell module or line abnormality of DC or AC power lines, etc. Electric current may cause electric shock or cause fire in severe cases.

However, conventional circuit breakers to block leakage current due to a ground fault or leakage current, even if a leakage current occurs above a predetermined value, the leakage current is detected or the circuit breaker operates to prevent electric shock due to leakage current. There is a limit.

Accordingly, the present invention has been devised to solve the problems of the prior art, by detecting a leakage current between the power line transmitting DC or AC constituting the solar power generation system and the ground and blocking the leakage current, electricity caused by the leakage current Its purpose is to provide an electric shock-free solar power generation system that can prevent the occurrence of accidents (ground fault, short circuit, electric shock, fire, power outage, etc.).

The technical problems to be achieved by the present invention are not limited to the technical problems mentioned above, and other technical problems that are not mentioned will be clearly understood by those of ordinary skill in the technical field to which the present invention belongs from the following description. I will be able to.

In order to achieve the above object, the electric shock-free solar power generation system according to the present invention comprises: a solar panel in which one or more solar cell modules are arranged; Two or more power lines electrically connected to the solar panel to transmit electricity generated by the solar panel to a load or a power system, and insulated from the ground; And one or more failure detectors electrically connected between the ground and at least one of the two or more power lines and a neutral point having a potential between the voltages of the two or more power lines, wherein the failure detector comprises: the two or more power lines or neutral points A current path is formed with respect to the leakage current flowing to the ground at, and a detection signal is output by detecting the leakage current from the current path, and the two or more power lines are configured to transmit DC electricity generated by the solar panel. It includes a second DC power line, is installed in series with the first DC power line to divide the first DC power line into a predetermined section, and controls to open and close a predetermined section of the first DC power line by interlocking with the detection signal of the fault detector. A first DC switch that becomes; And a second DC switch installed in series with the second DC power line so as to divide the second DC power line into a predetermined section, and controlled to open and close a predetermined section of the second DC power line by interlocking with the detection signal of the fault detector. However, the first and second DC switches are controlled to block the predetermined section of the corresponding first DC power line or the second DC power line in connection with a detection signal of the fault detector.

In the electric shock-free solar power generation system according to the present invention, the neutral point may include a first neutral point having a potential between voltages of the first and second DC power lines.

The electric shock-free photovoltaic power generation system according to the present invention further comprises an inverter that receives the DC electricity from the first and second DC power lines and converts the DC electricity into AC electricity, wherein the two or more power lines include the AC electricity from the inverter. It further includes two or more AC power lines for receiving and transmitting to the load or the power system, wherein the neutral point may include a second neutral point having a potential between voltages of the two or more AC power lines.

In the electric shock-free solar power generation system according to the present invention, the failure detector includes first and second failure detectors, and is connected in series with the first failure detector to be electrically connected between the first DC power line and the ground. A first voltage drop; And a second voltage drop unit connected in series with the second fault detector and electrically connected between the second DC power line and the ground.

In the electric shock-free solar power generation system according to the present invention, the failure detector includes first and second failure detectors connected in parallel between the first neutral point and the ground, and between the first DC power line and the first neutral point. A first voltage drop unit electrically connected; And a second voltage drop part electrically connected between the second DC power line and the first neutral point, wherein the first and second failure detectors may include a leakage current between the first DC power line and the ground. Through a fault detector, the leakage current between the second DC power line and the ground may be configured to pass through the first fault detector.

In the electric shock-free solar power generation system according to the present invention, the failure detector includes first and second failure detectors connected in parallel between the first neutral point and the ground, and the first neutral point comprises the first and second failure detectors. 2 is drawn between two or more solar cell modules connected in series between the DC power lines, the first and second fault detectors, the leakage current between the first DC power line and the ground passes through the second fault detector, the The leakage current between the second DC power line and the ground may be configured to pass through the first fault detector.

In the electric shock-free solar power generation system according to the present invention, the first and second voltage drop portions each include a zener diode, and a zener voltage of a zener diode of the first voltage drop portion and a zener of the second voltage drop portion The sum of the Zener voltages of the diodes may be greater than the voltage between the first and second series power lines.

In the electric shock-free photovoltaic power generation system according to the present invention, each of the failure detectors may include a current detection unit that limits the leakage current to a predetermined dangerous current or less, detects the leakage current, and outputs the detection signal. .

In the electric shock-free photovoltaic power generation system according to the present invention, each of the fault detectors may further include a one-way current unit for limiting a path of a leakage current so that the leakage current flows in one direction in the current detection unit.

The electric shock-free photovoltaic power generation system according to the present invention may further include a focusing unit in which at least two solar cell modules are arranged on the solar panel, and focuses the current generated by the solar cell module.

The electric shock-free photovoltaic power generation system according to the present invention may further include a DC circuit breaker disposed between the solar cell module and the focusing unit to control opening/closing in connection with a detection signal of the fault detector.

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The electric shock-free solar power generation system according to the present invention further comprises at least one auxiliary power line arranged to correspond to a predetermined section of the divided first and second DC power lines, wherein the first and second DC switches include: Interlocking with the detection signal of the fault detector, the predetermined section of the corresponding first DC power line or the second DC power line may be blocked, and may be connected to any one of the one or more auxiliary power lines.

The electric shock-free solar power generation system according to the present invention may further include an insulating transformer having a primary side electrically connected to the AC power line and a secondary side insulated from the primary side and electrically connected to the power system. .

In the electric shock-free solar power generation system according to the present invention, the one or more failure detectors are electrically connected between the ground and at least one of the two or more AC power lines, and the second neutral point, and each of the two or more AC power lines It may further include two or more AC circuit breakers installed in series and controlled to open and close the AC power line by interlocking with the detection signal of the fault detector.

In the electric shock-free solar power generation system according to the present invention, each of the two or more AC breakers is arranged to divide each of the two or more AC power lines into a predetermined section, and the predetermined of the corresponding AC power line is interlocked with the detection signal of the failure detector. It can be controlled to block sections.

The electric shock-free photovoltaic power generation system according to the present invention may further include a recovery device that is electrically connected to the load side of the AC power line and restores power of the corresponding phase when the AC power line is disconnected or phased out.

The electric shock-free photovoltaic power generation system according to the present invention detects a leakage current between the power line that transmits direct current or alternating current constituting the solar power generation system and the earth and blocks the leakage current, thereby preventing the occurrence of an electric shock accident due to the leakage current There is an effect that can be prevented.

In addition, the electric shock-free photovoltaic power generation system according to the present invention has an effect of preventing the occurrence of a fire due to a ground fault or a short circuit by detecting and blocking a leakage current due to a ground fault or a short circuit.

The electric shock-free photovoltaic power generation system according to the present invention has an effect of preventing a power failure due to this even if it detects a leakage current due to a ground fault or a short circuit and blocks it.

1 is a block diagram showing the overall configuration of an electric shock-free solar power generation system according to the present invention.
2 is a block diagram showing an internal block of a fault detector according to the present invention.
3 is a circuit diagram showing an example in which a fault detector is connected to a power line in a DC circuit.
4 is a circuit diagram showing an example in which a fault detector is connected to a neutral point in a DC circuit.
5 is a conceptual diagram showing a principle of a fault detector detecting a leakage current in a DC circuit.
6 is a circuit diagram showing an embodiment in which a DC switch is installed on a DC power line.
7 is a circuit diagram showing an embodiment in which a DC switch and an auxiliary power line are installed on the DC power line.
8 is a diagram showing a configuration and a vector diagram of a recovery device of the present invention applicable to a single-phase power supply.
9 is a diagram showing an exemplary configuration and vector diagram of a restorer applicable to a three-phase power supply.
10 is a diagram showing another exemplary configuration and vector diagram of a recoverer applicable to a three-phase power supply.
11 is a circuit diagram showing an example in which a recovery device is applied to an AC circuit.
12 is a circuit diagram showing an example in which an insulation transformer and a restorer are applied to an AC circuit at the same time.

The preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The detailed description below is merely exemplary, and is merely illustrating a preferred embodiment of the present invention.

The electric shock-free solar power generation device according to the present invention is a DC circuit that handles DC electricity generated from the solar panel 100 when configured to prevent electric accidents such as electric shock, fire, or power failure from leakage current due to ground faults or leakage currents. It may include an AC circuit that receives direct current from the solar panel 100 and converts it into alternating current and supplies it to the load 700 or is connected to the power system 900. Here, the power system 900 includes not only a distribution line but also a line through which commercial AC electricity, such as an outdoor temporary line, is energized.

The electric shock-free solar power generation apparatus of the present invention can prevent electric shock and fire due to leakage current by limiting and detecting a leakage current to a dangerous current or less in case of a ground fault, electric leakage, or electric shock to a human body.

1 is a block diagram showing the overall configuration of an electric shock-free solar power generation system according to the present invention.

Referring to Figure 1, the electric shock-free solar power generation system according to the present invention, a solar panel 100 in which one or more solar cell modules 110 are arranged, and the electricity generated from the solar panel 100 is transferred to a load 700 or Electrically connected to the solar panel 100 to transmit to the power system 900, and electrically connected between the earth and at least one of the power line and the neutral point and two or more power lines insulated from the ground by a resistance value equal to or greater than a predetermined ground resistance value It may be configured to include one or more failure detectors 210. At this time, the fault detector 210 is configured to form a current path for leakage current flowing from two or more power lines or neutral points to ground, detect the leakage current from the current path, and output a detection signal.

In addition, the electric shock-free solar power generation system according to the present invention may further include a voltage drop 220 in which a predetermined voltage drop occurs when a leakage current flows between the power line and the fault detector 210. The voltage drop unit 220 may be connected in series with the fault detector 210 between the power line and the ground, or may be disposed to form a neutral point between the power lines.

Here, the neutral point refers to a point having a potential between the voltages of two or more power lines, and a connection point between a plurality of solar cell modules 110 formed from each of the power lines through a predetermined electrical element or connected in series to the power line, or of a transformer. It may be withdrawn from the middle tab. It is sufficient if the sum of the voltages of the power lines based on the neutral point is 0, and the magnitude of the voltages of the power lines based on the neutral point is not limited to the same, but hereinafter, for convenience of explanation, the voltages of the power lines will be different from each other in phase. Only the size will be described assuming the same case.

A power line is a wire that supplies power from the solar panel 100 to the load side or the surrounding power equipment or power system 900, and is connected to or is a main line as well as a separate wire divided by a breaker or switch. It refers to all conductors that are electrically connected to each other, including branch lines branching from the furnace, to transmit power of the same polarity. In this case, the power line is preferably insulated from the ground to have a resistance value equal to or greater than a predetermined ground resistance. Herein, the insulation is not limited to the case of complete insulation, and includes a case in which the power line or the neutral point has a higher resistance than the normal grounding resistance with the earth through grounding work.

The circuit connected to the power line may be a DC or AC circuit. In the case of a DC circuit, the power line may include a DC power line 410 connected to the solar panel 100 and an ESS (Energy Storage System). In the case of an AC circuit, the inverter 500 converts DC into AC. It may include an AC power line 510 connected from the output to the load 700 or the power system 900.

According to Figure 1, the electric shock-free solar power generation system according to the present invention, when two or more solar cell modules 110 are arranged in the solar panel 100, focusing to focus the current generated from each of the solar cell modules 110 It may include a unit 430. The DC current focused by the focusing unit 430 may be transmitted to the DC load or the inverter 500 through the DC power line 410.

In addition, the electric shock-free photovoltaic power generation system according to the present invention is a direct current circuit breaker 420 which is disposed between the solar cell module 110 and the focusing unit 430 to control opening and closing in connection with the detection signal of the fault detector 210. ) Can be included.

The DC circuit breaker 420 may be one or more circuit breakers each corresponding to the solar cell module 110. In the case of a plurality of circuit breakers, the solar cell module 110 in which a leakage current is generated by checking the detection signal while simultaneously blocking all of the plurality of DC circuit breakers 420 in conjunction with the detection signal of the fault detector 210 or sequentially blocking You can also block only. In the case of sequential blocking, since only the solar cell module 110 in which the leakage current has occurred is blocked, the remaining solar cell module 110 enables continuous power generation without power failure.

In addition, the electric shock-free photovoltaic power generation system according to the present invention may include a DC switch 440 installed on the DC power line 410 and opened or closed in connection with a detection signal of the fault detector 210 or switched to another contact point. have. The DC switch 440 may be installed on each of the two or more DC power lines 410 and controlled to selectively cut off only the power lines in which leakage current has occurred.

The above-described focusing unit 430, DC circuit breaker 420, and DC switch 440 may be installed on the connection board 400. The connection panel 400 may be configured to further include a voltage drop unit 220, a fault detector 210, and a controller 300.

In addition, the electric shock-free solar power generation system according to the present invention may further include an inverter 500 connected to one end of the DC power line 410 to convert the direct current generated by the solar panel 100 into alternating current. In this case, the AC output of the inverter 500 may be single-phase or three-phase, or may include all other multi-phase methods in which the voltage of each phase has a predetermined phase difference. Hereinafter, for convenience of explanation, the description is based on a single-phase AC method, but the technical idea of the present invention can be applied to all three-phase or other multi-phase methods.

Two or more AC power lines 510 are connected to the AC output of the inverter 500 to transmit AC electricity to the load 700 or the power system 900. However, in connection with the power system 900, an insulation transformer 600 may be included to insulate the AC power line 510 and the DC power line 410 from the ground or system.

The fault detector 210 according to the present invention may be installed on the AC power line 510 in addition to the DC power line 410. At this time, the fault detector 210 may detect the leakage current and output a detection signal, or control to block power supply to the AC power line 510 through which the leakage current flows in connection with the detection signal.

The load 700 is connected to the AC power line 510 constituting the AC circuit or the insulating transformer 600 is connected to allow the AC power of the inverter 500 to be transmitted in connection with the power system 900. In addition, the AC power line 510 may further include a restorer 800 for restoring power of a corresponding phase when the AC power line 510 is disconnected or the AC power is phased out. The operating principle of the restorer 800 will be described in detail later.

In addition, the electric shock-free photovoltaic power generation system according to the present invention further includes a controller 300 that receives a detection signal from the fault detector 210 to determine whether a leakage current is generated, and outputs a control signal in response thereto. Can be configured. At this time, the control signal is at least one of a cutoff signal to cut off the power from a leakage current, an alarm signal to issue an alarm that an electrical failure has occurred, a position signal to display a fault section or location, and a recovery signal to recover the fault. It may contain more than one.

Therefore, breakers and switches installed on the power line are directly blocked by the detection signal of the fault detector 210 when a leakage current occurs, or the power supply is cut off by the control signal of the controller 300 that has received the detection signal. Can be.

2 is a block diagram showing the internal block of the fault detector 210 according to the present invention.

Referring to FIG. 2, each of the failure detectors 210 according to the present invention includes a current detection unit 211 for limiting a leakage current to a predetermined dangerous current or less, and detecting a leakage current and outputting a detection signal. To do. In addition, each of the failure detectors 210 may further include a one-way current unit 212 for limiting a path of the leakage current in a predetermined direction so that the leakage current flows through the current detection unit 211 in one direction.

The current detection unit 211 is a component that detects a leakage current flowing from a power line or a neutral point to ground, and may detect a leakage current and output a detection signal corresponding thereto. The detection signal may be a signal including information on the magnitude and direction of the leakage current, and may be a signal that outputs whether the leakage current exceeds a preset threshold. The detection signal is provided directly to a switch or breaker installed on the power line, or a separately installed controller 300 controls the opening and closing of the switch or breaker, or provides the controller 300 to output a control signal for alarm, fault location indication, or fault recovery. It could be.

In addition, the current detection unit 211 may further include a current limiting means (not shown) arranged in series on the current path through which the leakage current flows so that the leakage current becomes less than or equal to a predetermined dangerous current. At this time, the current limiting means may include a voltage drop element including a resistance element to limit a current value to a voltage applied to the fault detector 210 to be less than or equal to a dangerous current when a leakage current occurs. Here, the dangerous current is a current that can cause an electric shock or a fire to the human body and can be appropriately set according to the purpose of use of the electrical equipment. For reference, if the leakage current flowing to the human body is more than 15mA, it is known to cause convulsions (pain), and if it is more than 50mA, it is known to lead to death.To prevent electric shock, the dangerous current is set to 15mA or less, for example, 8mA, and the leakage current is less than that. It can be designed to be limited to

In addition, the current detection unit 211 may be configured to detect a leakage current at an arbitrary point on a current path through which the leakage current flows. For example, it is possible to detect the leakage current by using a voltage applied to the current limiting means or by using a current sensor installed at an arbitrary point in the current path. Here, the current sensor may include a Hall sensor or a current transformer (CT).

The failure detector 210 according to the present invention may be configured to further include a switch for controlling opening/closing in connection with the detection signal. At this time, the switch may be installed in series with the DC power line 410 or the AC power line 510 to perform an operation of blocking the power line, and may be integrally provided with the fault detector 210 together with the current detection unit 211. In this case, the integrated switch and the current detection unit 211 may be implemented as a solid-state relay (SSR).

The unidirectional current unit 212 is a component that limits the path of the leakage current in a predetermined direction so that the leakage current flows through the current detection unit 211 in a unidirectional direction, and is a switch element controlled to conduct only a current in a predetermined direction, Alternatively, it may be configured to include a diode. In particular, when the unidirectional current unit 212 is composed of a diode, it may be in the form of a rectifier circuit composed of one or more diodes (Fig. 2(a)), or may be composed of a bridge diode circuit (Fig. 2(b)).

The fault detector 210 configured including the one-way current unit 212 may be installed on the DC power line 410 or the AC power line 510 or installed at a neutral point to operate to identify a power line through which a leakage current flows. Hereinafter, an operation of detecting and detecting a leakage current according to the installation position of the fault detector 210 will be described with reference to the drawings.

3 is a circuit diagram showing an example in which the fault detector 210 is connected to a power line in a DC circuit.

Referring to FIG. 3, in the electric shock-free photovoltaic power generation system according to the present invention, two or more power lines are electrically connected to the solar panel 100 to transmit the DC electricity generated by the solar panel 100. DC power lines 411 and 412 are included, and the failure detector 210 may include first and second failure detectors 210-1 and 210-2. In addition, a first voltage drop 220-1 and a second failure detector 210-2 that are connected in series with the first failure detector 210-1 and electrically connected between the first DC power line 411 and the ground. ) May further include a second voltage drop unit 220-2 connected in series and electrically connected between the second DC power line 412 and the ground.

The first and second DC power lines 411 and 412 are power lines through which a DC current flows, and a voltage of a first polarity is applied to the first DC power line 411 and a voltage of a second polarity is applied to the second DC power line 412. Can be authorized. Specifically, the first polarity may be the anode of the direct current voltage and the second polarity may be the cathode of the direct current voltage, but may be vice versa.

The first and second voltage drop units 220-1 and 220-2 may be resistors or zener diodes, but are not limited thereto. However, in the configuration as shown in FIG. 3, it is preferable that the first and second voltage dropping units 220-1 and 220-2 are Zener diodes. In this case, the sum of the Zener voltage of the Zener diode of the first voltage drop unit 220-1 and the Zener voltage of the Zener diode of the second voltage drop unit 220-2 is greater than the voltage across the first and second series power lines. It is desirable. In addition, the zener voltage of the zener diode of the first voltage drop unit 220-1 and the zener voltage of the zener diode of the second voltage drop unit 220-2 are each smaller than the voltage across the first and second series power lines. desirable.

When the Zener diode voltage is set as above, in a normal state where no leakage current occurs, the Zener diode does not conduct, so the current does not flow through the fault detectors 210-1 and 210-2. The diode conducts so that a leakage current flows through the fault detectors 210-1 and 210-2.

More specifically, when a ground fault or a short circuit occurs in the first DC power line 411, the second voltage drop unit 220-2 is conducted to detect the leakage current in the second fault detector 210-2, 2 When a ground fault or a short circuit occurs in the DC power line 412, the first voltage drop unit 220-1 conducts and detects a leakage current in the first fault detector 210-1. Can be identified.

As described, in the embodiment shown in FIG. 3, the fault detectors 210-1 and 210-2 applied to the embodiment of FIG. 3 since the fault detector through which the leakage current flows is specified according to the conducting voltage drop. It is possible to omit the unidirectional current unit 212 that limits the direction of flowing current.

4 is a circuit diagram showing an example in which a fault detector is connected to a neutral point in a DC circuit.

Referring to Figure 4 (a), the electric shock-free solar power generation system according to the present invention, a first voltage drop 220-1 electrically connected between the first DC power line 411 and the first neutral point (N1). ), and a second voltage drop 220-2 electrically connected between the second DC power line 412 and the first neutral point N1. In the configuration of FIG. 4(a), the first neutral point N1 is set as a connection point of the first and second voltage drop units 220-1 and 220-2, and the first neutral point N1 and the ground are And the second failure detectors 210-1 and 210-2 are connected in parallel. At this time, the first neutral point N1 has a potential between the voltages of the first and second DC power lines 411 and 412.

Here, in the first and second failure detectors 210-1 and 210-2, the leakage current between the first DC power line 411 and the ground passes through the second failure detector 210-2, and the second The leakage current between the DC power line 412 and the ground may set the conduction direction of the current of the unidirectional current unit 212 included in the fault detector so that the leakage current passes through the first fault detector 210-1.

In the embodiment of FIG. 4(a), the first and second voltage drop units 220-1 and 220-2 are configured to cause a predetermined voltage drop when conducting, and may be resistors or zener diodes, but are limited thereto. no. If the first and second voltage drops 220-1 and 220-2 are configured to include a zener diode, the Zener voltage and the second voltage drop of the Zener diode of the first voltage drop 220-1 It is preferable that the sum of the Zener voltages of the Zener diodes of the lower portion 220-2 is greater than the voltages of both ends of the first and second series power lines. In addition, the zener voltage of the zener diode of the first voltage drop unit 220-1 and the zener voltage of the zener diode of the second voltage drop unit 220-2 are each smaller than the voltage across the first and second series power lines. desirable.

In the configuration of Fig. 4(a), when a ground fault or a short circuit occurs in the first DC power line 411, a leakage current is detected in the second fault detector 210-2 through the second voltage drop unit 220-2. , When a ground fault or a short circuit occurs in the second DC power line 412, the leakage current is detected by the first fault detector 210-1 through the first voltage drop unit 220-1, so that the detection signal is a certain fault detector. By checking whether it has occurred in the power line, it is possible to identify the power line where the ground fault or leakage occurred.

In addition, referring to FIG. 4(b), the first neutral point N1 is drawn at a connection point between two or more solar cell modules 110 connected in series between the first and second DC power lines 411 and 412. I can. At this time, the fault detector 210 is configured to include first and second fault detectors 210-1 and 210-2 connected in parallel between the first neutral point N1 and the earth, and the first DC power line 411 A fault detector so that the leakage current between) and the ground passes through the second fault detector 210-2, and the leakage current between the second DC power line 412 and the ground passes through the first fault detector 210-1. The conduction direction of the current of the unidirectional current unit 212 included in the may be set.

In the configuration of FIG. 4(b), when a ground fault or a short circuit occurs in the first DC power line 411, a leakage current is detected by the second fault detector 210-2, and a ground fault or a short circuit occurs in the second DC power line 412. When this occurs, since the leakage current is detected by the first fault detector 210-1, it is possible to identify the power line in which a ground fault or a short circuit has occurred by checking which fault detector the detection signal has generated.

5 is a conceptual diagram showing the principle of detecting a leakage current by the fault detector 210 in a DC circuit.

In FIG. 5, the principle of the fault detector 210 detecting a leakage current in a DC circuit is described in the case where the electric shock-free photovoltaic power generation system of the present invention has the configuration of FIG. 4(a), but FIG. 3 or FIG. 4 The same can be understood for the configuration of (b).

According to FIG. 5, when a leakage current 1 is generated in the first DC power line 411 among the DC power lines 411 and 412, the leakage current 1 flows to the second failure detector 210-2 along the solid line shown in the drawing. When a current path is formed and leakage current 2 is generated in the second DC power line 412 among the DC power lines 411 and 412, the leakage current 2 flows along the broken line to the first fault detector 210-1. To form. Accordingly, the second fault detector 210-2 outputs a detection signal for the power line where the leakage current 1 has occurred, and the first fault detector 210-1 outputs the detection signal for the power line where the leakage current 1 occurs, The electric shock-free photovoltaic power generation system of the present invention can detect and identify a power line in which a leakage current has occurred.

By identifying the power line in which the leakage current has occurred in this way, the electric shock-free solar power generation system according to the present invention can selectively block only the power line in which the leakage current has occurred. In addition, it is possible to quickly troubleshoot by identifying the power line where the leakage current has occurred, or it is possible to perform maintenance work without a power outage by blocking only the power line where the leakage current has occurred and then replacing it with another power line.

To this end, the DC power lines 411 and 412 may be provided with a switching means capable of blocking or switching switching on a line in which a leakage current has occurred.

6 shows an embodiment in which a DC switch 440 is installed on the DC power lines 411 and 412, and FIG. 7 shows an embodiment in which a DC switch 440 and an auxiliary power line are installed on the DC power lines 411 and 412. It is a drawing.

6, the electric shock-free photovoltaic power generation system according to the present invention is installed in series with the first DC power line 411 and is interlocked with the detection signal of the second fault detector 210-2, so that the first DC power line ( The second DC power line 412 is installed in series with the first DC switch 441 controlled to open and close the 411 and the second DC power line 412 and is interlocked with the detection signal of the first fault detector 210-1. It may be configured to include a second DC switch 442 controlled to open and close. Here, the first failure detector 210-1 detects a leakage current generated in the second DC power line 412, and the second failure detector 210-2 detects the leakage current generated in the first DC power line 411. Act to detect.

According to FIG. 6, the first and second DC switches 441 and 442 are installed in pairs to divide each of the first and second DC power lines 411 and 412 into a predetermined section, but the installation method is The present invention is not limited thereto, and may be installed on the first and second DC power lines 411 and 412 one by one to block a power line in which a leakage current has occurred. In the configuration of FIG. 6, the main purpose is to block leakage current to prevent electric shock or fire due to leakage current.

In addition, FIG. 7 shows a configuration capable of blocking leakage current without power failure.

In the electric shock-free photovoltaic power generation system of the present invention shown in FIG. 7, the first and second DC switches 441 and 442 are arranged to divide each of the first and second DC power lines 411 and 412 into a predetermined section, Furthermore, one or more auxiliary power lines may be further included to correspond to a predetermined section of the divided first and second DC power lines 411 and 412. The first and second DC switches 441 and 442 are connected to the detection signals of the fault detectors 210-1 and 210-2, corresponding to the first DC power line 411 or the second DC power line 412. The section may be blocked and connected to any one of one or more auxiliary power lines.

If a leakage current occurs in the first DC power line 411, the second fault detector 210-2 detects the leakage current, outputs a detection signal, and interlocks with the detection signal of the second fault detector 210-2. Thus, the first DC switch 441 is controlled to switch switching from the first DC power line 411 to the first auxiliary power line. In addition, when a leakage current occurs in the second DC power line 412, the first failure detector 210-1 detects the leakage current, outputs a detection signal, and interlocks with the detection signal of the first failure detector 210-1. Thus, the second DC switch 442 is controlled to switch the switching from the second DC power line 412 to the second auxiliary power line.

In this configuration, even if a leakage current occurs, it is possible to safely solve a ground fault or a short circuit problem such as replacing the power line in which the leakage current has occurred while maintaining an energized state to the load side without cutting off electricity.

7 illustrates a configuration in which two sets of auxiliary power lines are provided corresponding to the first and second DC power lines 411 and 412, but only one set of auxiliary power lines is installed and the first DC switch 441 is provided when a leakage current occurs. Alternatively, the second DC switch 442 may be configured to use an auxiliary power line in common.

In the above, an embodiment in which the fault detector 210 of the present invention is installed between the DC power lines 410, 411, and 412 electrically connected to the solar panel 100 or the first neutral point N1 and the earth has been described. The electric shock-free solar power generation system of the present invention may include an inverter 500 and an AC circuit configured at a rear end of the inverter 500. At this time, the fault detector 210 may be installed between the ground and the neutral point of the AC power line 510 or the AC power line 510 for transmitting AC electricity to detect a leakage current.

Referring to FIG. 1, the electric shock-free photovoltaic power generation system of the present invention may further include an inverter 500 that receives DC electricity from DC power lines 410, 411, and 412 and converts it into AC electricity. In addition, an AC circuit including two or more AC power lines 510 that receives the converted AC electricity from the inverter 500 and transmits it to the load 700 or the power system 900 may be configured at the rear end of the inverter 500. have.

Although not shown in Figure 1, the electric shock-free solar power generation system according to the present invention, at least one of two or more AC power lines 510, and at least one of the second neutral point (N2) and one or more failures electrically connected between the ground It may be configured to include a detector 210. Here, the second neutral point N2 is defined as a neutral point having a potential between the voltages of two or more AC power lines 510.

In particular, when the fault detector 210 is installed between the AC power line 510 and the ground, the fault detector 210 limits the leakage current to a predetermined dangerous current or less, detects the leakage current, and outputs a detection signal. In addition to the current detection unit 211, a unidirectional current unit 212 for limiting the path of the leakage current in a predetermined direction so that the leakage current flows through the current detection unit 211 in one direction may be further included.

As described above, the fault detector 210 configured including the unidirectional current unit 212 may be installed on the AC power line 510 and may operate to identify a power line through which a leakage current flows. The operation principle for the fault detector 210 to detect the leakage current and to identify the AC power line 510 in which the leakage current has occurred with respect to the AC power line 510 in which the leakage current has occurred is explained in the above description of the DC power lines 410, 411, 412 Since it is similar to, a detailed description is omitted here.

Referring to FIG. 1, the electric shock-free solar power generation system of the present invention includes a primary side electrically connected to an AC power line 510 and a secondary side insulated from the primary side and electrically connected to the power system 900. An insulating transformer 600 may be further included. AC electricity generated by the solar panel 100 and converted by the inverter 500 may be transmitted to the power system 900 through the insulation transformer 600.

In addition, the electric shock-free photovoltaic power generation system of the present invention, as mentioned above, when the AC power line 510 is disconnected or the AC power is phased out, the restorer 800 recovers the power of the AC power line 510 It may be included and configured on the load 700 side.

At this time, the electric shock-free photovoltaic power generation system of the present invention selectively blocks only the AC power line 510 in which leakage current has occurred, so that the non-blocking AC power line 510 and the second neutral point N2 are used. It is possible to configure the restorer 800 to recover the cut off power and supply it to the load 700 or the power system 900.

In general, the restorer 800 of the present invention has a third neutral point N3 connected to the second neutral point N2 and one end connected to each of two or more AC power lines 510, and the other end is a third neutral point N3. It may be configured to include two or more windings commonly connected to. At this time, each of the two or more windings includes one or more coupling winding portions that are magnetically coupled to any one of the other windings, but at least one of the two or more windings is the rest based on the third neutral point (N3). A voltage applied to each of the windings is configured to include a coupling winding portion in which a voltage of a reverse phase is induced, respectively. Hereinafter, the operating principle of the recovery unit 800 will be described.

FIG. 8 is a diagram showing the configuration and vector diagram of the restorer 800 of the present invention applicable to a single-phase power source that is an output of the inverter 500.

Referring to FIG. 8(a), the recoverer 800 applied to the single-phase voltages R1 and R2 has one end connected to each of the single-phase voltages R1 and R2, and the other end is common to the third neutral point N3. It may be configured to include first and second windings R1-N2 and R2-N2 to be connected. At this time, the first and second windings R1-N2 and R2-N2 are magnetically coupled to each other so that voltages of opposite phases are induced based on the third neutral point N3, as shown in FIG. 8(b). do. Therefore, when a leakage current occurs on the R1 or R2 side of the single-phase voltages (R1, R2) and the corresponding line (e.g., R2) is forcibly blocked, the remaining normal lines (e.g. R1) and the third neutral point (N3) are used to block The normal voltage may be supplied to the load 700 by recovering the damaged portion.

The single-phase recovery device 800 of the present invention has a type of auto-transformer structure, but the first winding (R1-N2): the second winding (R2-N2) has a turn ratio of 1:1. Rather, it can be set and manufactured in various ways as needed. However, it is preferable to set the turns ratio of the recoverer 800 to the ratio of the AC voltage output from the inverter 500 based on the second neutral point N2.

The restorer 800 of the present invention may be applied to a three-phase power supply.

9 is a diagram showing an exemplary configuration and a vector diagram of a recoverer 800 applicable to a three-phase power source that is an output of the inverter 500.

Referring to FIG. 9(a), the restorer 800 of the present invention applicable to a three-phase power source is one end connected to each of the R, S and T phases for the three-phase power having R, S and T phases. The other end includes first to third windings 810, 820, 830 that are commonly connected to the third neutral point N3, and each of the first to third windings 810, 820, and 830 is applied to the remaining windings. For each voltage, it may be configured to include a coupling winding portion in which a voltage of a reverse phase is induced respectively based on the third neutral point N3.

According to the configuration of Fig. 9(a), three coupling winding portions are provided in the first winding 810 connected to the R phase, and voltages having Rr, Rs and Rt vectors are induced in each of the coupling winding portions. . In addition, three coupling winding portions are provided in the second winding 820 connected to the S-phase, and voltages having Ss, St, and Sr vectors are induced in each of the coupling winding portions. In addition, three coupling winding portions are provided in the third winding 830 connected to the T phase, and voltages having Tt, Tr, and Ts vectors are induced in each of the coupling winding portions.

In a three-phase power source, the sum of each vector of R, S, and T is 0, and thus the relationship between the R, S, and T-phase voltages is expressed as an equation.

[Equation 1]

When the three-phase voltage is applied to the first to third windings 810, 820, 830, respectively, the voltage induced in the first to third windings 810, 820, 830 based on the third neutral point N3 is Since it is equal to the sum of the voltage induced in the coupling winding portion provided in the winding, this is expressed as a vector equation as in Equations 2 to 4 below.

[Equation 2]

[Equation 3]

[Equation 4]

In order to help understand the above Equations 1 to 4, a vector diagram of induced voltages is shown in FIG. 9(b).

Referring to FIG. 9B, each winding is configured to include a coupling winding portion in which a voltage in a reverse phase is induced with respect to a voltage applied to each of the remaining windings based on the third neutral point N3. In other words, in the case of the first winding 810, the coupling winding portions that induce the voltages of the Rs and Rt vectors induce voltages that are inverse phases from the S-phase and T-phase, respectively. In the case of the second winding 820, the voltages of the Sr and St vectors are in phase and inverse of the R-phase and T-phase voltages, respectively. Further, in the case of the third winding 830, the voltages of the vectors Tr and Ts are the phase and reverse phase of the R-phase and S-phase voltages, respectively.

Furthermore, the coupling winding portion that induces the voltage of the Rr vector among the coupling winding portions of the first winding 810 induces the coupling winding portion of Tr and the coupling winding portion of Sr and a voltage in reverse phase. Similarly, the Ss vector in the second winding 820 is in reverse phase with Rs and Ts, and the Tt vector in the third winding 830 is inverse phase with the St and Rt vectors. The relationship between the voltages induced in the coupling winding part is summarized in the following equations 5 to 7.

[Equation 5]

[Equation 6]

[Equation 7]

The restorer 800 of the present invention configured to satisfy the above conditions is that any one phase of R, S, T applied to the first to third windings 810, 820, 830 is disconnected or other electrical failure. Even if the phase is formed by the phase voltage, the phase voltage formed by the remaining phases may be recovered and supplied to the load 700.

While the power lines of the three-phase voltages R, S, T are connected to the first to third windings 810, 820, 830 of the recovery device 800 and are operating, any one phase (for example, R phase) is Let's assume that it is disconnected/phased out. At this time, since S and T phases are normally applied to the second winding 820 and the third winding 830 that are not disconnected, the relational expressions of Equations 3 to 7 are established. However, since the R phase is not applied to the first winding 810, Equation 2 is not valid, and it can be seen that the unknown voltage X defined in Equation 8 is induced in the first winding 810.

[Equation 8]

Hereinafter, it will be mathematically examined whether the unknown voltage X induced in the phased first winding 810 recovers the phased R phase.

If S and T expressed in Equations 3 and 4 are summarized in terms of Rr, Rs, and Rt using Equations 5 to 7, the following Equation 9 can be obtained.

[Equation 9]

In addition, if all the coupling winding portions of the restorer 800 have the same turns ratio, the magnitude of the voltage induced in each coupling winding portion is the same as in Equation 10 below.

[Equation 10]

If Rs+Rt is calculated using Equation 10 and Equations 3 to 7 above, Equation 11 can be obtained.

[Equation 11]

Substituting Equations 9 and 11 into Equation 8 and arranging them using Equation 1, the unknown voltage X induced in the first winding 810 in which the R phase was formed is obtained as in Equation 12.

[Equation 12]

From Equation 12, the restorer 800 of the present invention uses the S and T phases applied to the second and third windings 820 and 830 even if the R phase to be applied to the first winding 810 is phased out. Thus, it can be seen that the voltage of the R phase is restored to the first winding 810.

In the above, the case where the R phase is formed in the first winding 810 of the recovery unit 800 has been exemplified, but the same applies when the S phase or T phase applied to the second and third windings 820 and 830 occurs. Power can be restored on the principle of

9 illustrates a structure in which the first to third windings 810, 820, and 830 of the restorer 800 are each composed of three coupling winding portions, but the restorer 800 of the present invention is limited thereto. In addition, if at least one of the first to third windings 810, 820, 830 has a structure including a coupling winding portion in which a voltage in a reverse phase is induced for each voltage applied to the remaining windings, it may be changed in various forms. I can.

For example, although not shown in the drawing, the restorer 800 of the present invention is a coupling winding corresponding to Rr, Ss and Tt provided in the first to third windings 810, 820, 830 in the configuration of FIG. 9 It may be configured in a structure in which parts are omitted. Using a proof process similar to Equations 1 to 12, it can be confirmed that the voltage in the phased winding is normally restored even in this structure.

In addition, the restorer 800 of the present invention may be configured with a simpler structure for a three-phase power supply.

FIG. 10 is a diagram showing another exemplary configuration and vector diagram of a recoverer 800 applicable to a three-phase power source that is an output of the inverter 500.

Referring to FIG. 10, the recovery device 800 of the present invention includes first to third windings 810 having one end connected to each of the R, S, and T phases, and the other end commonly connected to a third neutral point N3. 820, 830), wherein one of the first to third windings 810, 820, 830 has a voltage in reverse phase based on the third neutral point N3 for each of the voltages applied to the remaining windings. It may be configured to include an induced coupling winding portion. The recovery device 800 of FIG. 10(a) is provided with a coupling winding for inducing voltages of Rs and Rt vectors to the first winding 810 to which the R phase is applied, and Rs and Rt are the second and third windings ( Each of the S and T phases of 820 and 830 has a voltage of a reverse phase. A vector diagram showing this relationship is shown in Fig. 10B.

As previously demonstrated mathematically the principle of recovering the image formed by the recoverer 800 having the structure of FIG. 9(a), the principle of recovering the image formed through a similar process for the structure of FIG. 10(a) can be examined. have.

In a three-phase power source, the sum of each vector of R, S, and T is 0, so if the relationship between the R, S, and T-phase voltages is expressed as an equation, Equation 13, which is the same as Equation 1, can be obtained.

[Equation 13]

When the voltage applied to or induced in the first to third windings 810, 820, and 830 based on the third neutral point N3 is expressed as a vector equation, the following equations 14 to 16 are given.

[Equation 14]

[Equation 15]

[Equation 16]

In order to aid in understanding of Equations 14 to 16 above, a vector diagram of induced voltages is shown in FIG. 10(b). Referring to FIG. 10(b), it can be seen that the coupling winding portion that induces the voltages of the Rs and Rt vectors in the first winding 810 induces voltages that are opposite to the S-phase and T-phase phases, respectively.

Further, the coupling winding portion that induces the voltage of the Rs vector among the coupling winding portions of the first winding 810 induces the voltage of the coupling winding portion of Ss and the reverse phase, and the coupling that induces the voltage of the Rt vector. The winding part induces the voltage of the opposite phase with the coupling winding part of Tt. In this way, the relationship between voltages induced in the coupling winding portion is summarized in a vector equation as shown in Equations 17 and 18 below.

[Equation 17]

[Equation 18]

The restorer 800 of the present invention configured to satisfy the above conditions is that any one phase of R, S, T applied to the first to third windings 810, 820, 830 is disconnected or other electrical failure. Even if the phase is formed by the phase voltage, the phase voltage formed by the remaining phases may be recovered and supplied to the load 700.

While the power lines of the three-phase voltages R, S, T are connected to the first to third windings 810, 820, 830 of the recovery device 800 and are operating, any one phase (for example, R phase) is Let's assume that it is disconnected/phased out. At this time, since S and T phases are normally applied to the second winding 820 and the third winding 830 that are not disconnected, the relational expressions of Equations 15 to 18 are established. However, since the R phase is formed in the first winding 810, Equation 14 is not valid, and it can be seen that the unknown voltage Xr defined in Equation 19 is induced in the first winding 810.

[Equation 19]

Substituting Equations 17 and 18 into Equation 19 and arranging using Equation 13, the unknown voltage Xr induced in the first winding 810 in which the R phase was formed is obtained as in Equation 20.

[Equation 20]

Similarly, a case in which the S-phase or T-phase is formed in the second winding 820 or the third winding 830 is also obtained as in Equations 21 and 22 below.

[Equation 21]

[Equation 22]

From Equations 20 to 22, the recoverer 800 having the structure shown in FIG. 10(a) is also capable of even if phase loss or disconnection occurs in any one of the first to third windings 810, 820, and 830. As shown in the vector diagram of 10(b), it can be seen that the phased voltage is recovered using the voltage applied to the remaining windings. In particular, the recovery device 800 having the structure shown in FIG. 10 may consist of only two magnetic cores for magnetic coupling, not three, and the winding structure is simple so that the process and cost can be reduced during production. There is an advantage.

The restorer 800 of the present invention is not limited to the structure described above, and at least one of the first to third windings 810, 820, and 830 has a negative voltage for each voltage applied to the remaining windings. A structure including a coupling winding portion that is each induced can be changed in various forms.

11 is a connection diagram showing a case where the fault detector 210 and the recovery device 800 are simultaneously applied to the AC circuit configured at the rear end of the inverter 500 of the present invention.

Electric shock-free solar power generation system according to the present invention, at least one of two or more AC power lines (511, 512), and at least one of the second neutral point (N2) and one or more failure detectors 210 electrically connected between the ground, and two Consisting of two or more AC circuit breakers (521, 522) installed in series on each of the above AC power lines (511, 512) and controlled to open and close the AC power lines (511, 512) by interlocking with the detection signal of the fault detector (210) Can be.

The AC circuit breakers 521 and 522 are installed one by one on the AC power lines 511 and 512 to block the supply of power to the power lines in which leakage current has occurred. However, the AC power lines may be divided into predetermined sections. It is installed as a pair in each of the 511 and 512, and interlocks with the detection signal of the fault detector 210 to separate the section in which the leakage current occurs from the line.

Referring to FIG. 11, the electric shock-free photovoltaic power generation system according to the present invention includes first and second AC power lines 511 and 512 to which single-phase voltages R1 and R2 are applied from an inverter 500, and a second neutral point ( The recovery device 800 electrically connected to the load 700 side of N2), and the first and second fault detectors 210-1 connected between the R2 and R1 phases of single-phase voltages (R1, R2) and earth, respectively. , 210-2), and the first and second AC circuit breakers 521 and 522 provided on the power side and the load 700 side of the single-phase voltages R1 and R2 to divide the AC power lines 511 and 512 into predetermined sections. ) Can be included. Therefore, in the normal operating state in which electrical failure such as leakage current does not occur, the voltage Vac by the single-phase voltages (R1, R2) is applied to the load 700 and the recovery unit 800 so that the load 700 can operate normally. I can.

However, as shown in FIG. 11, when a leakage current occurs in the line on R2 partitioned by the second AC circuit breaker 522, the leakage current is reduced by the first fault detector 210-1 connected to the R1 phase. Is detected and a detection signal is output. In addition, the second AC circuit breaker 522 blocks a predetermined section of the phase R2 line in which the leakage current has occurred in conjunction with the output detection signal of the first fault detector 210-1.

Even if the R2 phase is blocked due to leakage current, 1/2Vac is applied to the R1 terminal and the third neutral point (N3) of the recoverer 800 by the unblocked R1 phase and the second neutral point (N2). ), between the R2 terminal and the third neutral point N3 of the restorer 800, 1/2Vac is induced and restored. Accordingly, even if the R2 phase is blocked by the leakage current, the load 700 continues to be supplied with Vac by the recoverer 800 to perform a normal operation.

In FIG. 11, a case where a leakage current occurs in the line on R2 is shown, but even when a leakage current occurs in the R1 phase, the electric shock-free solar power generation system of the present invention can perform similar detection, blocking, and recovery operations.

11 shows an embodiment in which only the recoverer 800 is applied to the AC circuit at the rear end of the inverter 500, but additionally or alternatively to this, in order to connect to the power system 900, an insulation transformer 600 is included in the AC circuit. It is also possible to have.

12 is a circuit diagram showing an example in which the insulation transformer 600 and the restorer 800 are simultaneously applied to an AC circuit.

In the AC circuit, the recovery unit 800 and the insulation transformer 600 may be separately provided, but as shown in FIG. 12, the recovery device 800 may be configured to perform the function of the insulation transformer 600.

Referring to FIG. 12, when a leakage current occurs in the line on R2 divided by the second AC circuit breaker 522, the leakage current is detected by the first fault detector 210-1 connected to the R1 phase, and a detection signal Is displayed. In addition, the second AC circuit breaker 522 blocks a predetermined section of the phase R2 line in which the leakage current has occurred in conjunction with the output detection signal of the first fault detector 210-1.

Even if the R2 phase is blocked due to leakage current, 1/2Vac is applied to the R1 terminal and the third neutral point (N3) of the recoverer 800 by the unblocked R1 phase and the second neutral point (N2). ), between the R2 terminal and the third neutral point N3 of the restorer 800, 1/2Vac is induced and restored. Therefore, even if the R2 phase is blocked by the leakage current, the load 700 continues to be supplied with Vac by the recoverer 800 to perform a normal operation. In addition, since the voltage Vac is also induced on the secondary side of the recovery unit 800, the AC power generated in the solar power generation system of the present invention can be normally connected to the power system 900 and transmitted.

12 shows a case where a leakage current occurs in the line on R2, but even when a leakage current occurs on R1, the electric shock-free solar power generation system of the present invention can perform similar detection, blocking, recovery, and grid connection. .

In the above, the case where the AC output of the inverter 500 is single-phase has been described as an example, but the fault detector 210, the recovery device 800 and the insulation transformer 600 are combined in the same manner for the multi-phase AC output including three phases. It is possible to configure the electric shock-free solar power generation system of the present invention.

Through the above-described configuration, the electric shock-free photovoltaic power generation system of the present invention detects a leakage current between the ground and a power line that transmits direct current or alternating current constituting the photovoltaic power generation system and blocks the leakage current. It has the effect of preventing the occurrence of electric accidents (ground fault, short circuit, electric shock, fire, power outage, etc.).

In the above, the present invention has been described and illustrated on the basis of a preferred embodiment for illustrating the principle of the present invention, but the present invention is not limited to the configuration and operation as shown and described as such. Those of ordinary skill in the art to which the present invention pertains will be able to understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential features of the present invention. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not limiting. The scope of the present invention is indicated by the claims to be described later, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention.

100: solar panel 110: solar cell module
210, 210-1, 210-2: fault detector
211: current detection unit 212: one-way current unit
220, 220-1, 220-2: voltage drop
300: controller 400: connection panel
410, 411, 412: DC power line 420: DC circuit breaker
430: focusing unit 440, 441, 442: DC switch
500: inverter 510, 511, 512: AC power line
521, 522: AC circuit breaker 600: insulation transformer
700: load 800: recoverer
810 to 830: first to third winding 900: power system
N1 to N3: first to third neutral points R1, R2: single-phase voltage

Claims (17)

A solar panel on which one or more solar cell modules are arranged;
Two or more power lines electrically connected to the solar panel to transmit electricity generated by the solar panel to a load or a power system, and insulated from the ground; And
At least one of the two or more power lines and a neutral point having a potential between the voltages of the two or more power lines and one or more failure detectors electrically connected between the ground,
The fault detector forms a current path for the leakage current flowing from the two or more power lines or neutral points to the ground, detects the leakage current from the current path, and outputs a detection signal,
The two or more power lines include first and second DC power lines for transmitting DC electricity generated by the solar panel,
A first DC switch installed in series with the first DC power line so as to divide the first DC power line into a predetermined section and controlled to open and close a predetermined section of the first DC power line by interlocking with a detection signal of the fault detector; And
And a second DC switch installed in series with the second DC power line so as to divide the second DC power line into a predetermined section, and controlled to open and close a predetermined section of the second DC power line by interlocking with the detection signal of the fault detector. ,
The first and second DC switches are controlled to block the predetermined section of the first DC power line or the second DC power line corresponding to the detection signal of the fault detector. system.
The method of claim 1,
The neutral point includes a first neutral point having a potential between the voltages of the first and second DC power lines.
The method of claim 2,
Further comprising an inverter that receives the DC electricity from the first and second DC power lines and converts it into AC electricity,
The two or more power lines further include two or more AC power lines receiving the AC electricity from the inverter and transmitting them to the load or power system,
Wherein the neutral point includes a second neutral point having a potential between voltages of the two or more AC power lines.
The method of claim 2,
The failure detector includes first and second failure detectors,
A first voltage drop unit connected in series with the first fault detector and electrically connected between the first DC power line and the ground; And
And a second voltage drop unit connected in series with the second fault detector and electrically connected between the second DC power line and the ground.
The method of claim 2,
The failure detector includes first and second failure detectors connected in parallel between the first neutral point and the earth,
A first voltage drop unit electrically connected between the first DC power line and a first neutral point; And
Further comprising a second voltage drop portion electrically connected between the second DC power line and the first neutral point,
In the first and second fault detectors, the leakage current between the first DC power line and the ground passes through the second fault detector, and the leakage current between the second DC power line and the ground passes through the first fault detector. Electric shock-free solar power generation system, characterized in that configured to.
The method of claim 2,
The failure detector includes first and second failure detectors connected in parallel between the first neutral point and the earth,
The first neutral point is drawn out between two or more solar cell modules connected in series between the first and second DC power lines,
In the first and second fault detectors, the leakage current between the first DC power line and the ground passes through the second fault detector, and the leakage current between the second DC power line and the ground passes through the first fault detector. Electric shock-free solar power generation system, characterized in that configured to.
The method according to claim 4 or 5,
The first and second voltage drop portions each include a Zener diode,
An electric shock-free photovoltaic power generation system, characterized in that the sum of the zener voltage of the zener diode of the first voltage drop and the zener voltage of the zener diode of the second voltage drop is greater than a voltage between the first and second series power lines.
The method of claim 1,
Each of the fault detectors,
And a current detection unit configured to limit the leakage current to less than a predetermined dangerous current, detect the leakage current, and output the detection signal.
The method of claim 8,
Each of the fault detectors,
An electric shock-free photovoltaic power generation system, characterized in that it further comprises a one-way current section for limiting a path of the leakage current so that the leakage current flows in one direction of the current detection section.
The method of claim 2,
Two or more of the solar cell modules are arranged on the solar panel,
Electric shock-free solar power generation system, characterized in that it further comprises a focusing unit for focusing the current generated by the solar cell module.
The method of claim 10,
An electric shock-free photovoltaic power generation system, characterized in that it further comprises a DC circuit breaker disposed between the solar cell module and the focusing unit and controlling opening and closing in connection with a detection signal of the fault detector.
delete The method of claim 2,
Further comprising one or more auxiliary power lines arranged to correspond to a predetermined section of the divided first and second DC power lines,
The first and second DC switches interlock with the detection signal of the fault detector to block the predetermined section of the corresponding first DC power line or the second DC power line, and are connected to any one of the one or more auxiliary power lines. Electricity-free solar power generation system characterized by.
The method of claim 3,
And an insulating transformer having a primary side electrically connected to the AC power line and a secondary side insulated from the primary side and electrically connected to the power system.
The method of claim 3,
The one or more failure detectors are electrically connected between the ground and at least one of the two or more AC power lines and the second neutral point,
An electric shock-free photovoltaic power generation system comprising at least two AC circuit breakers installed in series on each of the two or more AC power lines and controlled to open and close the AC power line by interlocking with a detection signal of the fault detector.
The method of claim 15,
Each of the at least two AC power lines is arranged to divide each of the at least two AC power lines into a predetermined section, and is controlled to block the predetermined section of a corresponding AC power line in connection with a detection signal of the fault detector. Solar power system.
The method of claim 16,
Electrically connected to the load side of the AC power line, electric shock-free photovoltaic power generation system, characterized in that it further comprises a recovery unit for restoring the power of the corresponding phase when the AC power line is disconnected or phased out.

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