KR101933380B1 - Ground fault detection system using direct current noncontact power supply and solar power generation system using the same - Google Patents

Abstract

The present invention relates to a ground fault detecting device using direct current system contactless power, and a photovoltaic system including the same, which can remove noises and improve reliability by using contactless power as measurement power. The ground fault detecting device using direct current system contactless power comprises: a contactless power transmitting unit which transmits power in a contactless manner by rectifying and modulating input power supplied from the outside; a contactless power receiving unit which receives the power transmitted from the contactless power transmitting unit in a contactless manner; a voltage transmitting unit which applies the power received through the contactless power receiving unit to a direct transmission line; a ground fault current detecting unit which detects ground fault current returned through ground fault resistance by applying voltage to the direct transmission line through the voltage transmitting unit; a ground fault current capacity calculating unit which calculates and outputs a ground fault current capacity by receiving the ground fault current detected through the ground fault current detecting unit; a ground fault data transmitting unit which transmits ground fault data calculated through the ground fault current capacity calculating unit in a contactless way; a ground fault data calculating unit which receives the ground fault data transmitted by the ground data transmitting unit through the contactless power transmitting unit, compares the ground fault data with a preset reference value, and determines occurrence of ground fault; a display unit which displays the results calculated by the ground fault data calculating unit; and a communication unit which transmits the results calculated by the ground fault data calculating unit to the outside.

Description

Field of the Invention [0001] The present invention relates to a ground fault detection system using a direct current non-contact power supply,

The present invention relates to a ground fault detection apparatus and a photovoltaic power generation system having the same, and more particularly, to a system and method for detecting a ground fault in a live line state to prevent a short circuit accident and to improve noise removal and reliability by using a control and measurement power source as a non- The present invention relates to a ground fault detection apparatus using a DC system non-contact power source and a solar power generation system having the same.

Solar power generation is a power generation method that converts light energy incident on a solar panel directly into electric energy without using fossil energy. Solar power generation system has a disadvantage that initial investment cost and power generation cost are expensive, but it is increasingly used as a solution of environmental pollution such as global warming due to use of fossil fuel as a semi-permanent life span and pollution-free natural energy source.

Such a photovoltaic power generation system is classified into a stand-alone power generation system that stores generated power in a battery according to a method of using the generated power and supplies power at a required time, a grid-connected power generation system that supplies power to the load and supplies surplus power to the system . The dual grid-connected power generation system is attracting attention as a distributed power source replacing existing power plants.

The grid-connected power generation system includes a solar power generation array unit including a plurality of solar power generation panels in which a plurality of solar cell modules are connected in series, an output unit for outputting the combined DC power output from the solar power generation panels, And an inverter for converting the DC power output from the inverter to AC power and supplying the AC power to the load or using system.

However, due to the expansion of DC renewable energy and photovoltaic power generation system, fires and accidents occur frequently due to DC ground fault, electric shock, equipment failure, and malfunction occur. In addition, a ground fault detection device is indispensable because the DC power distribution causes the electric phenomenon of the ground electrode compared with the AC power distribution system.

Therefore, a commercial power system is provided with a ground fault detection device for detecting a ground fault of a DC line connecting a solar cell and a commercial power system. Failure to properly respond to a ground fault can cause the system connected to the commercial power system to stop, damage the booster circuit and the inverter configured for power conversion, and stop the normal operation of the transmission system facilities, This can result in economic losses as well as the risk of failure of transmission facilities.

Therefore, various ground fault detection devices have been proposed. Generally, the ground fault detection device conventionally used generates an alarm in comparison with a set value when a ground fault occurs. The ground fault detection device includes a DC voltage drop method and an AC voltage Since the AC voltage drop is 20 [Hz], most of the AC voltage drop method has a large influence on the AC voltage of 60 [Hz] and causes a ripple frequency which causes noise in the DC voltage .

In addition, the conventional ground fault detection apparatus has a problem that the accuracy is significantly lowered by the voltage distribution method.

(Patent Document 1) Published Unexamined Patent Application No. 10-2016-0118693 (October 10, 2016)

(Patent Document 2) Patent Registration No. 10-1470349 (2014. 12. 02.)

(Patent Document 3) Patent Registration No. 10-1410508 (Apr.

Disclosure of Invention Technical Problem [8] The present invention has been devised to overcome the above-mentioned problems, and it is an object of the present invention to provide a noncontact- An object of the present invention is to provide a ground fault detection apparatus using a power supply and a solar power generation system having the same.

A contactless power supply transmitting unit for receiving and rectifying input power from an external source to transmit power in a noncontact manner; and a control unit for controlling the operation of the noncontact power supply, A voltage transmitter for applying a power received through the non-contact power receiver to a DC transmission path; and a controller for applying a voltage to the DC transmission line through the voltage transmitter, A ground fault current detector for detecting a ground fault current to be returned; a ground fault current capacity calculating unit for calculating and outputting a ground fault current capacity by receiving the ground fault current detected by the ground fault current detecting unit; A ground fault data transmitting unit for transmitting the ground fault data A ground data operation unit for receiving the ground fault data transmitted through the lock data transmission unit through the non-contact power supply unit and receiving the ground fault data and comparing the received ground fault data with a predetermined reference value to determine whether or not ground fault has occurred; And a communication unit for transmitting a result calculated through the ground fault data operation unit to the outside, wherein the noncontact power supply unit includes a rectifying unit for receiving and rectifying input power from the outside, An oscillation unit that receives the input power rectified by the rectification unit and frequency-modulates the input power, and a transmission resonance unit that receives the frequency-modulated power from the oscillation unit and resonates and transmits the power.

Further, the solar power generation system including the ground fault detection device using the direct current system noncontact power source according to the present invention includes a solar power generation unit for generating DC power, a DC power generation unit for generating DC power from the solar power generation unit, A photovoltaic power generation system including a photovoltaic power generation system including a photovoltaic power generation system provided between the solar power generation unit and the inverter and having a ground fault detection device for receiving a direct current system noncontact power and detecting ground fault current in the direct current transmission path, Contactless power supply transmitting section for receiving and rectifying input power from the outside to transmit the power by noncontacting, a noncontact power supply receiving section for receiving the power transmitted from the noncontact power transmitting section in a noncontact manner, A voltage transmitter for applying power received through the receiver to the DC transmission path; A ground fault current detector for detecting a ground fault current that is returned through the ground fault resistance by applying a voltage to the direct current transmission path through the bridge, and a ground fault detecting unit for receiving the ground fault current detected by the ground fault current detector, A ground fault data transmission unit for receiving the ground fault data transmitted through the ground fault data transmission unit and receiving the ground fault data through the non-contact power supply unit; A display unit for displaying a result calculated through the ground fault data operation unit, and a display unit for transmitting a result calculated through the ground fault data operation unit to the outside And a communication unit, The power supply unit includes a rectification unit that receives and rectifies the input power from the outside, and an oscillation unit that receives the input power rectified by the rectification unit and frequency-modulates and outputs the input power supply. The oscillation unit receives the frequency- And a transmission resonance unit.

The ground fault detection apparatus using the DC system non-contact power supply according to the embodiment of the present invention and the solar power generation system having the same have the following effects.

First, it is possible to prevent short-circuiting by detecting a ground fault in the live wire state, and to use the control and measuring power source as a non-contact power source and to reduce the high frequency noise by receiving only the resonance frequency band.

Second, by using a non-contact power supply, the insulation and withstand voltage characteristics are excellent, and the reliability of maintenance and measurement data can be improved.

Third, the receiver can be configured as multi-channel based on the transmission power.

Fourth, when the ground fault is detected arbitrarily or one time during the operation of the solar inverter, the efficiency of the power generation system due to the leakage current can be prevented from being lowered.

Fifth, it is possible to detect the ground insulation resistance by using the primary power as a non-contact power source without separately applying power to the power source.

1 is a conceptual diagram illustrating a photovoltaic power generation system equipped with a ground fault detection device using a DC system non-contact power supply according to the present invention.
2 is a block diagram schematically showing a ground fault detection apparatus using a DC system non-contact power supply according to the first embodiment of the present invention
3 is a more detailed diagram showing a ground fault detection apparatus using the DC system non-contact power supply of Fig. 2
4 is a diagram schematically showing a ground fault detection apparatus using a DC system non-contact power supply according to a second embodiment of the present invention
5 is a diagram schematically showing a ground fault detection apparatus using a DC system non-contact power supply according to a third embodiment of the present invention
Fig. 6 is a detailed configuration diagram showing the grounding current capacity calculating section of Fig. 2 in more detail; Fig.

For a better understanding of the present invention, a preferred embodiment of the present invention will be described with reference to the accompanying drawings. The embodiments of the present invention may be modified into various forms, and the scope of the present invention should not be construed as being limited to the embodiments described in detail below. The present embodiments are provided to enable those skilled in the art to more fully understand the present invention. Therefore, the shapes and the like of the elements in the drawings can be exaggeratedly expressed to emphasize a clearer description. It should be noted that in the drawings, the same members are denoted by the same reference numerals.

Further, detailed descriptions of well-known functions and configurations that may be unnecessarily obscured by the gist of the present invention are omitted.

Hereinafter, a ground fault detection apparatus and a solar power generation system including the same according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a conceptual diagram illustrating a solar power generation system having a ground fault detection device using a DC system non-contact power source according to the present invention.

1, a photovoltaic generation system including a ground fault detection device using a DC system non-contact power supply according to the present invention includes a solar photovoltaic unit 100 for generating DC power, An inverter 200 for receiving the DC power produced by the inverter 200 via the direct current transmission lines L + and L-, converting the AC power into an AC power, A ground fault current detector (300) which is provided between the solar power generator (100) and the inverter (200) and is driven by a DC grid noncontact power supply to detect a ground fault current generated in the solar power generator (400).

Here, the photovoltaic power generation unit 100 includes a plurality of solar cell modules connected in series, and a direct current generated in each module is supplied to the inverter 200 through the direct current transmission paths L + and L-. At this time, the DC transmission path (L +, L-) needs to connect the solar power generation part 100 in series to match the input voltage range of the power converter and also to connect the solar power generation part 100 connected in series to increase the current capacity It should also be connected in parallel.

In this way, the power converter 100 is installed in parallel with the connection unit 500 formed between the photovoltaic generator 100 and the inverter 200 and enters the input of the power converter through the single DC transmission path. However, since the number of connection units 500 connected in series-parallel combination increases as the installation capacity increases, it is difficult to grasp the occurrence of the ground fault and the occurrence of the ground fault when the ground fault occurs. And a ground fault current detector (400) is provided between the unit (100).

FIG. 2 is a schematic diagram showing a ground fault detection apparatus using a DC system non-contact power supply according to a first embodiment of the present invention, and FIG. 3 is a detailed diagram showing a ground fault detection apparatus using the DC system non- FIG.

As shown in FIGS. 2 and 3, the ground fault detection apparatus using the DC system non-contact power supply according to the first embodiment of the present invention receives input power (V +, V-) from the outside and rectifies and modulates the power, A non-contact power supply receiving unit 120 for receiving the power transmitted from the non-contact power supply transmitting unit 110 in a noncontact manner, and a power supply unit for supplying power received via the non-contact power supply receiving unit to the DC transmission path L + And a ground fault current detector 140 for detecting a ground fault current that is returned through the ground fault resistance Ri by applying a voltage to the DC transmission path through the voltage transmitter 130. [ A ground fault current capacity calculation unit 150 that receives the ground fault current detected by the ground fault current detection unit 140 and calculates and outputs a ground fault current capacity and outputs the ground fault current calculated by the ground fault current calculation unit 150; A ground fault data transmission unit 160 for transmitting the ground fault data transmitted through the ground fault data transmission unit 160 through the non-contact power supply transmission unit 110 and receiving the ground fault data, A display unit 180 for displaying a result calculated through the ground fault data operation unit 170, and a display unit 180 for displaying the result calculated through the ground fault data operation unit 170. The ground fault data operation unit 170, And a communication unit 190 for transmitting the result to the outside.

Here, the non-contact power supply transmission unit 110 includes a rectification unit 111 for receiving and rectifying the input power (V +, V-) of 380 V or 220 V from the outside and for receiving the rectified input power from the rectification unit 111 And a transmission resonance unit 113 that receives the frequency-modulated power from the oscillation unit 112 and resonates and transmits the power.

The transmission resonance unit 113 includes a capacitor C1 and a reactor L1 connected in series between the oscillation unit 112 and the ground terminal to induce and output the input power delivered from the oscillation unit 112. [

The noncontact power receiving unit 120 constitutes a receiving resonator for receiving and outputting electric power in a noncontact wireless manner from the transmitting resonator 113. The receiving resonator includes a capacitor C2, And a reactor L2 are connected in series between the input terminal and the ground terminal.

The non-contact power source receiving unit 120 includes a receive resonance unit that receives the non-contact power source transmitted through the transmission resonance unit 113 of the non-contact power source transmission unit 110.

The transmission resonance unit 113 and the reception resonance unit are configured such that the first capacitors C1 and C2 and the reactors L1 and L2 are connected in series between an input terminal and a ground terminal.

The ground fault current detection unit 140 applies a voltage to the DC transmission path L + and L- through the voltage transmission unit 130 to supply the AC current returned through the ground resistance Ri to the ground fault current detection resistor Rx, .

In the reception resonance part, a second capacitor (C3) is connected in series to an output terminal of the reception resonance part to determine a resonance frequency band of the reception resonance part.

A third capacitor C4 is provided between the ground fault data transmission unit 160 and the output terminal of the transmission resonance unit 113 to transfer data to the AC component using the switching of the ground fault data transmission unit 160 .

The component of the alternating current is calculated by comparing the magnitude and phase of the two voltages by the reference resistance, and a detailed description thereof will be given later.

4 is a configuration diagram schematically showing a ground fault detection apparatus using a DC system non-contact power supply according to a second embodiment of the present invention.

As shown in FIG. 4, the ground fault detection apparatus using the DC system non-contact power supply according to the second embodiment of the present invention is different from the first embodiment in that the ground fault data transmission unit 160 is connected to the non- Except that the ground fault data transmission unit 160 and the ground fault data operation unit 170 are formed at the same point and are connected by wire instead of transmitting the ground fault data in a noncontact manner.

5 is a configuration diagram schematically showing a ground fault detection apparatus using a DC system non-contact power supply according to a third embodiment of the present invention.

As shown in FIG. 5, the ground fault detection device using the DC system non-contact power supply according to the third embodiment of the present invention is different from the second embodiment in that the non- (L +, L-).

6 is a detailed configuration diagram showing the grounding current capacity calculation unit of FIG. 2 in more detail.

6, the ground-fault current capacity calculation unit 150 compares the sine-wave voltage Vg received by the non-contact power supply to the DC transmission lines L +, L-1 through the transmission resistor Rv constituting the voltage transmitter 130, And the AC current Ix returned through the ground resistance Ri can be detected and calculated through the detection resistor Rx.

At this time, the component of the alternating current Ix can be obtained by comparing the magnitude of the voltage Va by the reference resistance Rr and the magnitude and phase of the voltage Vb of the detection resistor Rx.

Here, the voltage Vx of the detection resistor Rx and the voltage of the non-contact power source Vg are obtained by the following equation (1).

In addition, the magnitude of the voltage Va by the reference resistor Rr can be transformed as shown in the following equation (2).

The ground fault resistance Ri to be measured can be obtained by the following equation (3) by the non-contact power source Vg, the transmission resistance Rv, and the detection resistance Rx.

The ground fault detection apparatus using the DC system non-contact power source according to the present invention having the above-described structure is excellent in insulation, withstand voltage characteristics, maintenance and reliability, and is easy to construct a multi-channel reception unit based on the transmission power unit. In addition, only the resonance frequency band is received, so that the high frequency noise is small, and there is no influence on the transmitting section during the receiving section operation.

As described above, the ground fault detection apparatus using the DC system non-contact power supply according to the present invention can be implemented as a computer program and automatically performed, and the program is provided in the form of a recording medium readable by a computer.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

110: non-contact power supply unit 120: non-contact power supply unit
130: voltage transmitter 140: ground fault current detector
150: grounding current capacity calculation unit 160: grounding data transmission unit
170: Ground fault data operation unit 180:
190:

Claims (17)

A noncontact power supply unit for receiving and rectifying input power from the outside to transmit the power in a noncontact manner,
A noncontact power supply receiving unit for receiving the power transmitted from the noncontact power supply unit in a noncontact manner,
A voltage transmitter for applying power received through the non-contact power receiver to the DC transmission path;
A ground fault current detector for detecting a ground fault current through a ground fault by applying a voltage to the DC transmission path through the voltage transmitter,
A ground fault current capacity calculation unit for calculating and outputting a ground fault current capacity by receiving the ground fault current detected by the ground fault current detection unit,
A ground fault data transmission unit for non-contactly transmitting the ground fault data calculated by the ground fault current capacity calculation unit,
A ground fault data operation unit for receiving the ground fault data transmitted through the ground fault data transmission unit through the non-contact power supply unit and receiving the ground fault data and comparing the received ground fault data with a predetermined reference value,
A display unit for displaying a result calculated through the ground fault data operation unit,
And a communication unit for transmitting a result calculated through the ground fault data operation unit to the outside,
The noncontact power supply unit includes a rectifying unit that receives and rectifies an input power from the outside, an oscillating unit that receives the input power rectified by the rectifying unit and frequency-modulates and outputs the input power, and a resonance unit that receives the frequency- And a transmission resonance unit that is connected to the ground. delete The ground fault detection apparatus according to claim 1, wherein the non-contact power supply receiving section includes a reception resonance section for receiving the non-contact power supply transmitted through the transmission resonance section of the non-contact power supply transmission section. 4. The ground fault detection apparatus as claimed in claim 1 or 3, wherein the transmission resonance unit and the reception resonance unit are configured such that a first capacitor and a reactor are connected in series between an input terminal and a ground terminal. 2. The non-contact power supply system according to claim 1, wherein the ground fault current detection unit detects a ground fault current detection resistance by applying an AC voltage to the DC transmission path through the voltage transmission unit and returning through a ground resistance. Ground fault detection device used. 4. The ground fault detection apparatus as claimed in claim 3, wherein the reception resonance unit is connected in series with an output terminal of the reception resonance unit to determine a resonance frequency band of the reception resonance unit. 4. The non-contact power supply system according to claim 3, wherein a third capacitor is provided between the ground fault data transmitting unit and the receiving end of the receiving resonance unit to transfer data to the AC component by using the switching of the ground fault data transmitting unit. Ground fault detection device using power supply. 6. The ground fault detection apparatus as claimed in claim 5, wherein the component of the alternating current is calculated by comparing magnitudes and phases of two voltages by the reference resistors. A noncontact power supply unit for receiving and rectifying input power from the outside to transmit the power in a noncontact manner,
A noncontact power supply receiving unit for receiving the power transmitted from the noncontact power supply unit in a noncontact manner,
A voltage transmitter for applying power received through the non-contact power receiver to the DC transmission path;
A ground fault current detector for detecting a ground fault current through a ground fault by applying a voltage to the DC transmission path through the voltage transmitter,
A ground fault current capacity calculation unit for calculating and outputting a ground fault current capacity by receiving the ground fault current detected by the ground fault current detection unit,
A ground fault data transmission unit for transmitting ground fault data calculated through the ground fault current capacity calculation unit;
A ground fault data operation unit for receiving the ground fault data transmitted through the ground fault data transmission unit and comparing the received ground fault data with a preset reference value to determine whether or not a ground fault occurs;
A display unit for displaying a result calculated through the ground fault data operation unit,
And a communication unit for transmitting a result calculated through the ground fault data operation unit to the outside,
The noncontact power supply unit includes a rectifying unit that receives and rectifies an input power from the outside, an oscillating unit that receives the input power rectified by the rectifying unit and frequency-modulates and outputs the input power, and a resonance unit that receives the frequency- And a transmission resonance unit that is connected to the ground. 10. The ground fault detection apparatus of claim 1 or 9, wherein the input power source is 380V or 220V. A noncontact power supply unit for receiving a required power from the DC transmission and rectifying and modulating the power,
A noncontact power supply receiving unit for receiving the power transmitted from the noncontact power supply unit in a noncontact manner,
A voltage transmitter for applying power received through the non-contact power receiver to the DC transmission path;
A ground fault current detector for detecting a ground fault current through a ground fault by applying a voltage to the DC transmission path through the voltage transmitter,
A ground fault current capacity calculation unit for calculating and outputting a ground fault current capacity by receiving the ground fault current detected by the ground fault current detection unit,
A ground fault data transmission unit for non-contactly transmitting the ground fault data calculated by the ground fault current capacity calculation unit,
A ground fault data operation unit for receiving the ground fault data transmitted through the ground fault data transmission unit and comparing the received ground fault data with a preset reference value to determine whether or not a ground fault occurs;
A display unit for displaying a result calculated through the ground fault data operation unit,
And a communication unit for transmitting a result calculated through the ground fault data operation unit to the outside,
The noncontact power supply unit includes a rectifying unit that receives and rectifies an input power from the outside, an oscillating unit that receives the input power rectified by the rectifying unit and frequency-modulates and outputs the input power, and a resonance unit that receives the frequency- And a transmission resonance unit that is connected to the ground. The ground fault current capacity calculation unit calculates the ground current voltage Vg received by the noncontact power supply through a transmission resistor Rv constituting the voltage transmission unit, (Lx, L-) and detects an AC current Ix that is returned through the ground resistance Ri through the detection resistor Rx and calculates the component of the AC current Ix at the reference resistance The voltage Vx of the detection resistor Rx and the voltage of the non-contact power source Vg are obtained by comparing the magnitude of the voltage Va by the detection resistor Rx with the magnitude and phase of the voltage Vb of the detection resistor Rx, 1 >< tb >< tb >
[Equation 1]

13. The ground fault detection apparatus of claim 12, wherein the magnitude of the voltage Va by the reference resistance Rr is transformed according to the following equation (2).
&Quot; (2) "

The noncontact DC power supply according to claim 12, wherein the ground fault resistance Ri to be measured is obtained by the following equation (3) by the non-contact power source Vg, the transmission resistance Rv and the detection resistance Rx: Ground fault detection device used.
&Quot; (3) "

A photovoltaic power generation unit for generating DC power,
An inverter for receiving the DC power generated by the solar power generation unit through a DC transmission path and converting the DC power into an AC power,
And a ground fault detection device which is provided between the solar power generation part and the inverter and receives a DC system non-contact power supply and detects a ground fault current in the DC transmission path, wherein the ground fault detection device comprises:
A noncontact power supply unit for receiving and rectifying input power from the outside to transmit the power in a noncontact manner,
A noncontact power supply receiving unit for receiving the power transmitted from the noncontact power supply unit in a noncontact manner;
A voltage transmitter for applying power received through the non-contact power receiver to the DC transmission path;
A ground fault current detector for detecting a ground fault current through a ground fault by applying a voltage to the DC transmission path through the voltage transmitter,
A ground fault current capacity calculation unit for calculating and outputting a ground fault current capacity by receiving the ground fault current detected by the ground fault current detection unit,
A ground fault data transmission unit for non-contactly transmitting the ground fault data calculated by the ground fault current capacity calculation unit,
A ground fault data operation unit for receiving the ground fault data transmitted through the ground fault data transmission unit through the non-contact power supply unit and receiving the ground fault data and comparing the received ground fault data with a predetermined reference value to determine whether or not the ground fault occurs;
A display unit for displaying a result calculated through the ground fault data operation unit,
And a communication unit for transmitting a result calculated through the ground fault data operation unit to the outside,
The noncontact power supply unit includes a rectifying unit that receives and rectifies an input power from the outside, an oscillating unit that receives the input power rectified by the rectifying unit and frequency-modulates and outputs the input power, And a transmission resonance unit that is connected to the ground. The solar power generation system includes the ground fault detection device using the direct current noncontact power supply. A photovoltaic power generation unit for generating DC power,
An inverter for receiving the DC power generated by the solar power generation unit through a DC transmission path and converting the DC power into an AC power,
And a ground fault detection device which is provided between the solar power generation part and the inverter and receives a DC system non-contact power supply and detects a ground fault current in the DC transmission path, wherein the ground fault detection device comprises:
A noncontact power supply unit for receiving and rectifying input power from the outside to transmit the power in a noncontact manner,
A noncontact power supply receiving unit for receiving the power transmitted from the noncontact power supply unit in a noncontact manner,
A voltage transmitter for applying power received through the non-contact power receiver to the DC transmission path;
A ground fault current detector for detecting a ground fault current through a ground fault by applying a voltage to the DC transmission path through the voltage transmitter,
A ground fault current capacity calculation unit for calculating and outputting a ground fault current capacity by receiving the ground fault current detected by the ground fault current detection unit,
A ground fault data transmission unit for transmitting ground fault data calculated through the ground fault current capacity calculation unit;
A ground fault data operation unit for receiving the ground fault data transmitted through the ground fault data transmission unit and comparing the received ground fault data with a preset reference value to determine whether or not a ground fault occurs;
A display unit for displaying a result calculated through the ground fault data operation unit,
And a communication unit for transmitting a result calculated through the ground fault data operation unit to the outside,
The noncontact power supply unit includes a rectifying unit that receives and rectifies an input power from the outside, an oscillating unit that receives the input power rectified by the rectifying unit and frequency-modulates and outputs the input power, and a resonance unit that receives the frequency- And a transmission resonance unit that is connected to the ground. The solar power generation system includes the ground fault detection device using the direct current noncontact power supply. A photovoltaic power generation unit for generating DC power,
An inverter for receiving the DC power generated by the solar power generation unit through a DC transmission path and converting the DC power into an AC power,
And a ground fault detection device which is provided between the solar power generation part and the inverter and receives a DC system non-contact power supply and detects a ground fault current in the DC transmission path, wherein the ground fault detection device comprises:
A non-contact power supply unit for receiving and supplying necessary power from the DC transmission,
A noncontact power supply receiving unit for receiving the power transmitted from the noncontact power supply unit in a noncontact manner,
A voltage transmitter for applying power received through the non-contact power receiver to the DC transmission path;
A ground fault current detector for detecting a ground fault current through a ground fault by applying a voltage to the DC transmission path through the voltage transmitter,
A ground fault current capacity calculation unit for calculating and outputting a ground fault current capacity by receiving the ground fault current detected by the ground fault current detection unit,
A ground fault data transmission unit for non-contactly transmitting the ground fault data calculated by the ground fault current capacity calculation unit,
A ground fault data operation unit for receiving the ground fault data transmitted through the ground fault data transmission unit and comparing the received ground fault data with a preset reference value to determine whether or not a ground fault occurs;
A display unit for displaying a result calculated through the ground fault data operation unit,
And a communication unit for transmitting a result calculated through the ground fault data operation unit to the outside,
The noncontact power supply unit includes a rectifying unit that receives and rectifies an input power from the outside, an oscillating unit that receives the input power rectified by the rectifying unit and frequency-modulates and outputs the input power, and a resonance unit that receives the frequency- And a transmission resonance unit that is connected to the ground. The solar power generation system includes the ground fault detection device using the direct current noncontact power supply.

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