KR20220082651A - Solar power system - Google Patents

Abstract

The present invention relates to at least one solar panel generating DC power using solar energy, MPPT operating so that the solar panel can generate maximum power from solar energy, and transmitting DC power to a power grid. A power line and a transmitter that modulates a maintenance signal composed of a multi-bit signal for controlling the MPPT using a spread spectrum modulation method, and transmits the maintenance signal in a stream form through the power line, but stops transmitting the maintenance signal in case of a dangerous situation; It provides a photovoltaic power generation system including a receiver that controls the MPPT to be generated, receives a maintenance signal from a transmitter, and detects the received maintenance signal to control the MPPT so that the solar panel and the power grid are separated or connected.

Description

Solar power system {SOLAR POWER SYSTEM}

The present invention relates to a photovoltaic power generation system, and more particularly, to a photovoltaic power generation system that can quickly and effectively cut off power supply from a photovoltaic panel to a power grid in a dangerous situation.

In general, solar power generation systems are being actively researched and developed in advanced countries as a countermeasure for global environmental problems and diversification of future energy sources thanks to the pollution-free and infinity of solar energy.

These solar power generation systems include an independent power generation system that stores generated power in a storage battery and supplies power at a required time, and a grid-connected type that supplies generated power to a load and supplies surplus power to the system according to the method of using the generated power. divided into power generation systems.

Recently, the distribution of grid-connected power generation systems is spreading due to the minimization of the grid impact of distributed power sources, grid protection technology in preparation for accidents, and improvement of inverter control technology.

On the other hand, if an electric shock, high voltage, arc or spike occurs in the photovoltaic system, not only damage to the system itself but also the safety of workers working near the system may be threatened.

Accordingly, there is a demand for the development of a photovoltaic power generation system capable of preventing system damage and securing worker safety by quickly and effectively blocking the power supply from the photovoltaic panel to the power grid in a dangerous situation.

Korean Patent Publication No. 10-1496199

An object of the present invention is to provide a solar power generation system capable of preventing system damage and securing worker safety by quickly and effectively blocking power supply from a solar panel to a power grid in a dangerous situation.

The technical problems to be achieved in the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by those of ordinary skill in the art to which the present invention belongs from the description below. There will be.

In order to solve the above problems, the present invention, at least one or more solar panels for generating DC power using solar energy, and MPPT operating so that the solar panel can generate maximum power from solar energy, A power line that transmits DC power to the power grid and a maintenance signal composed of a multi-bit signal for controlling MPPT are modulated by the spread spectrum modulation method. and a receiver that controls the MPPT so that maximum power is generated, receives a hold signal from the transmitter, detects the received hold signal, and controls the MPPT so that the solar panel and the power grid are disconnected or connected A solar power system is provided.

Here, the MPPT may change the output voltage of the solar panel according to the target voltage for following the maximum power output point.

In addition, the photovoltaic power generation system of the present invention may further include an inverter connected to the power line and converting DC power into AC power.

In addition, the receiver includes a decoder for demodulating the sustain signal, a determination unit for determining whether the sustain signal is detected, a counter for increasing the failure count whenever the sustain signal is not detected, and a solar panel if the failure count is greater than or equal to the reference count and a control unit for controlling the MPPT so that the power grid is separated.

In addition, the receiver includes a decoder that demodulates the sustain signal, a determination unit that determines whether the sustain signal is detected, a counter that increments the success count every time the sustain signal is detected, and a solar panel and It may include a control unit for controlling the MPPT so that the power grid is connected.

In addition, the receiver includes a decoder that demodulates the sustain signal, a determination unit that determines whether the sustain signal is detected, and a counter that increases a detection period every time the sustain signal is demodulated and increments a success counter every time the sustain signal is detected; , when the detection period is the reference period and the success counter is equal to or greater than the reference counter, a control unit for controlling the MPPT so that the solar panel and the power grid are connected.

In addition, when the detection period is a reference period and the success counter is less than the reference counter, the controller may control the MPPT so that the solar panel and the power grid are separated.

The counter may also count the number of times of switching between the connection and disconnection of the solar panel and the power grid.

Here, the controller may control the MPPT to separate the solar panel and the power grid when the number of switching is equal to or greater than the reference number.

In addition, the sustain signal may be grouped into a plurality of group signals, and the plurality of group signals may have different bit patterns.

Here, the determination unit may store a different bit pattern for each of the plurality of solar panels, and compare the stored bit pattern with the bit pattern of the demodulated sustain signal to detect the sustain signal.

According to the present invention, in the photovoltaic power generation system, there is an effect that can prevent damage to the system and ensure worker safety by quickly and effectively blocking the power supply from the photovoltaic panel to the power grid in a dangerous situation.

The effects obtainable in the present invention are not limited to the above-mentioned effects, and other effects not mentioned may be clearly understood by those of ordinary skill in the art to which the present invention belongs from the following description. will be.

1 is a block diagram of a photovoltaic system according to an embodiment of the present invention.
2 is a detailed block diagram of a receiver according to an embodiment of the present invention.
3 is a diagram illustrating a message stream for controlling a connection between a solar panel and a power grid according to the first embodiment of the present invention.
4 is a diagram illustrating a bit pattern of a maintenance signal included in a message stream according to the first embodiment of the present invention.
5 is a flowchart of a method for the receiver of the photovoltaic system according to the first embodiment of the present invention to separate and control the MPPT.
6 is a flowchart of a method for connecting and controlling the MPPT by the receiver of the solar power generation system according to the first embodiment of the present invention.
7 is a flowchart of a method for controlling MPPT by a receiver of a photovoltaic system according to a second embodiment of the present invention.
8 is a diagram illustrating a message stream for controlling a connection between a solar panel and a power grid according to a second embodiment of the present invention.

In order to fully understand the configuration and effect of the present invention, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, and may be embodied in various forms and various modifications may be made. However, the description of the present embodiment is provided so that the disclosure of the present invention is complete, and to fully inform those of ordinary skill in the art to which the present invention belongs, the scope of the invention. In the accompanying drawings, components are enlarged in size from reality for convenience of description, and ratios of each component may be exaggerated or reduced.

Terms such as 'first' and 'second' may be used to describe various elements, but the elements should not be limited by the above terms. The above term may be used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, a 'first component' may be termed a 'second component', and similarly, a 'second component' may also be termed a 'first component'. can Also, the singular expression includes the plural expression unless the context clearly dictates otherwise. Unless otherwise defined, terms used in the embodiments of the present invention may be interpreted as meanings commonly known to those of ordinary skill in the art.

1 is a block diagram of a photovoltaic system according to an embodiment of the present invention, and FIG. 2 is a detailed block diagram of a receiver according to an embodiment of the present invention.

As shown in FIG. 1 , the solar power generation system 100 according to an embodiment of the present invention includes a solar panel 110 , a Maximum Power Point Tracker (MPPT) 120 , a receiver 130 , and an inverter 140 . ), a transmitter 150 and a power line 160 may be included.

A plurality of solar panels 110 may be connected to a power grid (GR), and each solar panel SP ₁ to SP _N may generate direct current power using incident solar energy.

In the solar panel 110 , characteristics of a power (P)-voltage (V) curve and a current (I)-voltage (V) curve are non-linearly changed according to an external environment such as solar radiation and temperature. According to this change, the solar power generation system 100 is preferably operated to minimize the power loss of the solar panel 110 and to obtain the maximum power.

To this end, the MPPT 120 (MP ₁ ~ MP _N ) is connected in parallel with a plurality of solar panels 110 , respectively, and is operated so that the solar panel 110 can obtain maximum power from solar energy. . That is, the MPPT 120 may change the output voltage of the solar panel 110 according to the target voltage for tracking the maximum power output point.

The solar power generation system 100 according to an embodiment of the present invention may further include a programmable logic controller (PLC).

Here, the PLC receives the output voltage and current of the solar panel 110 , calculates a target voltage for following a maximum power output point that varies depending on the external environment, and transmits a target voltage signal corresponding to the target voltage to the receiver 150 ) can be sent.

Accordingly, the receiver 150 may receive the target voltage signal from the PLC and control the MPPT 120 so that the output voltage of the solar panel 110 becomes the target voltage.

The plurality of solar panels 110 may be connected in series or parallel, and the plurality of solar panels 110 connected in series or in parallel may be connected to the inverter 140 through the power line 160 .

The inverter 140 may receive DC power generated by the plurality of solar panels 110 through the power line 160 and convert it into AC power.

Inverter 140 may include a safety actuator 145 that provides an electrically, mechanically or graphically operable button or interface. Alternatively, the safety actuator 145 may be provided independently.

The safety actuator 145 may include a switching circuit, and may disconnect or connect an electrical connection between the solar panel 110 and the inverter 140 by the operation of the switching circuit.

Specifically, the safety actuator 145 may be activated in a dangerous situation such as electric shock, high voltage, arc and spike generation to cut off power supply from the plurality of solar panels 110 . Here, the safety actuator 145 may separate the electrical connection between the solar panel 110 and the inverter 140 by the operation of the user or by the operation of software or hardware without user intervention.

In addition, the safety actuator 145 may reconnect the solar panel 110 and the inverter 140 by a user's operation or by software or hardware operation without user intervention when a dangerous situation is released.

The transmitter 150 may be included in the inverter 140 , or may be independently provided and connected to the inverter 140 , and may transmit a message stream through the power line 160 . Here, the message stream may include a multi-bit signal.

As described above, since the photovoltaic power generation system 100 according to the embodiment of the present invention performs data communication using the power line 160, there is no need to provide a separate communication line for data communication.

The transmitter 150 may transmit a message stream corresponding thereto when the safety actuator 145 disconnects or connects the electrical connection between the solar panel 110 and the inverter 140 .

The receiver 130 (RC ₁ to RC _N ) may be provided in each of the plurality of solar panels 110 , may be included in the MPPT 120 , or may be independently provided and connected to the MPPT 120 . In addition, the receiver 130 may receive the message stream transmitted by the transmitter 150 through the power line 160 .

The receiver 130 may control the MPPT 120 based on the message stream received from the transmitter 150 . Specifically, the receiver 130 may control the MPPT 120 so that the electrical connection between the solar panel 110 and the power grid GR is disconnected or reconnected. To this end, the MPPT 120 may include a switching circuit for disconnecting or connecting an electrical connection between the solar panel 110 and the power grid GR.

Specifically, as shown in FIG. 2 , the receiver 130 may include a decoder 131 , a determination unit 132 , a counter 133 , and a control unit 134 .

The decoder 131 may demodulate the received sustain signal 1 , and the determination unit 132 may determine whether the demodulated sustain signal 1 is detected.

Meanwhile, the sustain signal 1 transmitted by the transmitter 140 is grouped into a plurality of group signals, and the plurality of group signals may have different bit patterns.

Here, the determination unit 132 stores a different bit pattern for each of the plurality of solar panels 110 , and compares the stored bit pattern with the bit pattern of the demodulated sustain signal 1 to detect the sustain signal 1 . have.

The counter 133 increments the failure count whenever the maintenance signal 1 is not detected, and the controller 134 controls MPPT ( 120) can be controlled.

In addition, the counter 133 increments the success count every time the maintenance signal 1 is detected, and when the success count is greater than or equal to the reference count, the MPPT 120 is controlled so that the solar panel 110 and the power grid GR are connected. can do.

In addition, the counter 133 may increase the detection period every time the sustain signal 1 is demodulated, and may increase the success counter every time the sustain signal is detected.

Here, when the detection period is the reference period and the success counter is equal to or greater than the reference counter, the controller 134 may control the MPPT 120 such that the solar panel 110 and the power grid GR are connected.

Alternatively, the control unit 134 may control the MPPT 120 such that the solar panel 110 and the power grid GR are separated when the detection period is the reference period and the success counter is less than the reference counter.

In addition, the counter 133 may counter the number of times of switching between the connection and disconnection of the solar panel 110 and the power grid GR, and the controller 134 controls the solar panel 110 if the number of switching is greater than or equal to the reference number of times. And it is possible to control the MPPT 120 so that the power grid (GR) is separated.

3 is a diagram illustrating a message stream for controlling a connection between a solar panel and a power grid according to the first embodiment of the present invention, and FIG. 4 is a maintenance included in the message stream according to the first embodiment of the present invention. It is a diagram showing a bit pattern of a signal.

As shown in FIG. 3 , the message stream 10 may be in the form of a continuous stream composed of a plurality of maintenance signals 1 ( KS ₁ to KS _M ). And, as shown in FIG. 4 , the sustain signal 1 includes multi-bit signals b ₀ to b ₁₅ and may have a specific bit pattern.

Such a message stream 10 may be transmitted to the receiver 130 by the transmitter 150 .

The receiver 130 may control the MPPT 120 so that the solar panel 110 and the power grid GR are electrically connected when a predetermined number or more of the maintenance signals 1 are received for a predetermined time.

Alternatively, the receiver 130 may control the MPPT 120 so that the solar panel 110 and the power grid GR are electrically separated when a predetermined number or more of the maintenance signals 1 are not received for a predetermined time. have.

Accordingly, the photovoltaic power generation system 100 according to the embodiment of the present invention prevents system damage by quickly and effectively blocking the power supply from the photovoltaic panel 110 to the power grid GR in a dangerous situation to prevent system damage and ensure worker safety can be obtained

On the other hand, a communication medium such as the power line 160 may be modulated by fast fading, unpredictable amplitude and phase distortion, and additional noise. In addition, communication channels are subject to unpredictable time-varying jamming and narrowband interference. In order to transmit digital data through such a channel, it is desirable to use as wide a bandwidth as possible for data transmission.

To this end, the transmitter 150 of the photovoltaic system 100 according to an embodiment of the present invention may transmit the message stream 10 using a spread spectrum modulation scheme. That is, the transmitter 150 may modulate and transmit the sustain signal 1 which is a digital signal using a spread spectrum modulation method.

Here, the spread spectrum modulation method is a method in which a signal is spread modulated in a frequency band wider than that of a normal method and transmitted. Although the spread spectrum modulation method uses a wide frequency band, since the energy of a signal is constant, there is an advantage in that the power per frequency (power density) is reduced.

Specifically, the transmitter 150 may modulate and transmit the sustain signal 1 using a direct sequence spread spectrum (DSSS) modulation scheme. Here, the DSSS is a modulation method in which the received sustain signal 1 is multiplied by (XOR) a high frequency digital code (spreading code) and spread. It can be transmitted by spreading it across the frequency used so that it is modulated with another binary code (bit pattern) called a Chipping Code (Chip). At this time, the receiver 130 may restore the data so that the received chip is changed back to the original bit unit.

Also, the transmitter 150 may modulate and transmit the sustain signal 1 using a Frequency Hopping Spread Spectrum (FHSS) modulation scheme. Here, FHSS is a modulation scheme for dividing and spreading networks by different hopping sequences. The transmitter 150 divides the bandwidth into a plurality of hopping channels, and transmits the input sustain signal 1 . After primary modulation with an intermediate frequency, when secondary modulation is performed on the RF frequency again, it can be assigned to different hopping channels and transmitted according to a predetermined order. In this case, the receiver 130 may restore data by connecting the sustain signals 1 distributed to the plurality of hopping channels in a predetermined order.

5 is a flowchart of a method in which the receiver of the photovoltaic system according to the first embodiment of the present invention separates and controls MPPT, and FIG. 6 is the receiver of the photovoltaic system according to the first embodiment of the present invention. It is a flow chart of a method for controlling a connection.

As shown in FIG. 5 , when the solar power generation system 100 is started ( S10 ), the plurality of solar panels 110 provide DC power to the MPPT 120 , and the MPPT 120 receives the DC power provided. Transmits power to the power grid (GR).

Here, the photovoltaic system 100 simultaneously controls a plurality of photovoltaic panels 110 using the same message stream 10 . That is, the plurality of receivers 130 simultaneously control the MPPT 120 so that the plurality of solar panels 110 and the power grid GR are electrically connected or separated.

The transmitter 150 transmits the holding signal 1 to the receiver 130 in a continuous sequence if the safety actuator 145 is not activated. At this time, the receiver 130 starts by setting the failure count (FAIL COUNT) to 0 (S20).

Here, the failure count FAIL COUNT means the number of times the receiver 130 fails to detect the maintenance signal 1 .

Next, the receiver 130 demodulates the modulated sustain signal 1 ( S30 ), and determines whether the demodulation result of the sustain signal 1 is detected ( S40 ). At this time, the receiver 130 stores the bit pattern of the sustain signal 1, and compares the bit pattern of the demodulated sustain signal 1 with the stored bit pattern to determine whether the sustain signal 1 is detected. have.

Next, when it is determined that the sustain signal 1 is detected, the receiver 130 sets the FAIL COUNT to 0 (S20) and demodulates the next sustain signal 1 (S30).

On the other hand, if it is determined that the sustain signal 1 is not detected, the receiver 130 increments the FAIL COUNT by 1 whenever the sustain signal 1 is not detected (S50).

Next, the receiver 130 determines whether the failure count FAIL COUNT is equal to or greater than the first reference count THR1 ( S60 ). Here, the first reference count THR1 may be 2 or more as a preset value.

At this time, if the failure count FAIL COUNT is less than the first reference count THR1, the receiver 130 demodulates the next sustain signal 1 again (S30), and whether the demodulation result maintenance signal 1 is detected is determined (S40). This process is repeated until the failure count FAIL COUNT becomes the first reference count THR1.

On the other hand, if the failure count (FAIL COUNT) is greater than or equal to the first reference count (THR1), the receiver 130 controls the MPPT 120 so that the solar panel 110 and the power grid GR are electrically separated ( S70).

Next, as shown in FIG. 6 , after the solar panel 110 and the power grid GR are electrically separated, the solar power generation system 100 is restarted ( S110 ). At this time, when the photovoltaic system 100 is restarted, it means that the transmitter 150 transmits the message stream 10 to the receiver 130 , but the photovoltaic panel 110 supplies power to the power grid GR. It doesn't mean to send.

The transmitter 150 does not transmit the hold signal 1 to the receiver 130 when the safety actuator 145 is activated. At this time, the receiver 130 starts by setting the success count (SUCCESS COUNT) to 0 (S120).

Here, the success count SUCCESS COUNT means the number of times the receiver 130 detects the sustain signal 1 .

Next, the receiver 130 demodulates the modulated sustain signal 1 (S130), and determines whether the decoding result of the sustain signal 1 is detected (S140). At this time, the receiver 130 stores the bit pattern of the sustain signal 1 and compares the bit pattern of the demodulated sustain signal 1 with the stored bit pattern to determine whether the sustain signal 1 is detected.

Next, if it is determined that the sustain signal 1 is not detected, the receiver 130 sets the SUCCESS COUNT to 0 (S120) and demodulates the next sustain signal 1 (S130).

On the other hand, when it is determined that the sustain signal 1 is detected, the receiver 130 increments the success count SUCCESS COUNT by 1 whenever the sustain signal 1 is detected ( S150 ).

Next, the receiver 130 determines whether the success count SUCCESS COUNT is equal to or greater than the second reference count THR2 ( S160 ). Here, the second reference count THR2 may be 2 or more as a preset value.

At this time, if the success count SUCCESS COUNT is less than the second reference count THR2, the receiver 130 demodulates the next sustain signal 1 again (S130), and whether the demodulation result sustain signal 1 is detected is determined (S140). This process is repeated until the success count SUCCESS COUNT becomes the second reference count THR2.

On the other hand, if the success count (SUCCESS COUNT) is greater than or equal to the second reference count (THR2), the receiver 130 controls the MPPT 120 so that the solar panel 110 and the power grid GR are electrically reconnected. (S170).

7 is a flowchart of a method for controlling MPPT by a receiver of a photovoltaic system according to a second embodiment of the present invention.

As shown in FIG. 7 , when the solar power generation system 100 is started ( S210 ), the plurality of solar panels 110 provide DC power to the MPPT 120 , and the MPPT 120 receives the DC power provided. Transmits power to the power grid (GR).

Here, the photovoltaic system 100 simultaneously controls a plurality of photovoltaic panels 110 using the same message stream 10 . That is, the plurality of receivers 130 simultaneously control the MPPT 120 so that the plurality of solar panels 110 and the power grid GR are electrically connected or separated.

The transmitter 150 transmits the holding signal 1 to the receiver 130 in a continuous sequence if the safety actuator 145 is not activated. At this time, the receiver 130 starts by setting the detection period P to 0 (S220).

The transmitter 150 repeatedly transmits the maintenance signal 1 every period, where the detection period P means the number of repetitions of the maintenance signal 1 transmitted by the transmitter 150 .

Next, the receiver 130 demodulates the sustain signal 1 modulated for one period (S230), and increases the detection period P by one for each demodulation (S240).

Next, the receiver 130 determines whether the detection period P is a reference period THR3 (S250). Here, the reference period THR3 is a preset value and may be two or more periods.

At this time, if the detection period P is less than the reference period THR3, the receiver 130 demodulates the sustain signal 1 of the next period again (S230), and sets the detection period P and the reference period THR3. Compare (S250). This process is repeated until the detection period P is equal to the reference period THR3.

On the other hand, if the detection period P is the same as the reference period THR3, the receiver 130 determines whether the sustain signal 1 is detected during the detection period P, and the detected sustain during the detection period P Calculate the number of signals (1). Then, as a result of the calculation, it is determined whether the number of sustain signals 1 is equal to or greater than a reference number THR4 ( S260 ). At this time, the receiver 130 stores the bit pattern of the sustain signal 1 and compares the bit pattern of the demodulated sustain signal 1 with the stored bit pattern to determine whether the sustain signal 1 is detected.

Here, if the number of maintenance signals 1 is equal to or greater than the reference number THR4, the receiver 130 controls the MPPT 120 to maintain the electrical connection between the solar panel 110 and the power grid GR (S270). ).

On the other hand, if the number of maintenance signals 1 is less than the reference number THR4, the receiver 130 controls the MPPT 120 to disconnect the electrical connection between the solar panel 110 and the power grid GR ( S280).

Next, the receiver 130 determines how frequently electrical connection and disconnection between the solar panel 110 and the power grid GR occurred during the detection period P. That is, the receiver 130 calculates the number of electrical connection and separation switching between the solar panel 110 and the power grid GR.

At this time, if the number of switching is equal to or greater than the reference number THR5, the receiver 130 controls the MPPT 120 so that the connection between the solar panel 110 and the power grid GR is separated (S280). Here, the reference number of times THR5 may be 2 or more as a preset value.

On the other hand, if the number of switching is less than the reference number THR5, the receiver 130 sets the detection period P to 0 and starts the detection process of the sustain signal 1 again (S220).

8 is a diagram illustrating a message stream for controlling a connection between a solar panel and a power grid according to a second embodiment of the present invention.

As shown in FIG. 8 , the message stream 10 may be in the form of a continuous stream including a plurality of maintenance signals 1 . Also, the plurality of sustain signals 1 may be grouped into a plurality of group signals GS ₁ and GS ₂ . Here, the plurality of group signals GS ₁ and GS ₂ may have different bit patterns.

For example, the message stream 10 may include a first group signal GS ₁ and a second group signal GS ₂ having different bit patterns. And, the first group signal GS ₁ includes a plurality of sustain signals ₁ (KAS _1.1 to KAS _{1.S )} having the same bit pattern, and the second group signal GS ₂ has the same bit pattern. It may include a plurality of sustain signals ( ₁ ) (KAS _2.1 to KAS _2.S ).

Each group signal GS ₁ , GS ₂ of the message stream 10 may be a signal for controlling the MPPT 120 of different solar panels 110 . For example, the first group signal GS ₁ is a signal for controlling the first and second MPPTs MP ₁ and MP ₂ of the first and second solar panels SP ₁ , SP ₂ , The second group signal GS ₂ may be a signal for controlling the third and fourth MPPTs MP ₃ and MP ₄ of the third and fourth solar panels SP ₃ and SP ₄ .

Here, the first and second receivers RC ₁ , RC ₂ of the first and second solar panels SP ₁ , SP ₂ are responsive to the first group signal GS ₁ , and the third and fourth solar panels SP 1 , SP 2 . The third and fourth receivers RC ₃ and RC ₄ of the optical panels SP ₃ and SP ₄ may respond to the second group signal GS ₂ .

Specifically, the safety actuator 145 may be activated by sensing a dangerous situation for each of the plurality of solar panels 110 , and the plurality of solar panels 110 and the inverter 140 are selectively activated according to whether or not the safety actuator 145 is activated. Can be connected and disconnected.

For example, the safety actuator 145 may separate only the first solar panel SP ₁ and the inverter 140 in a dangerous situation for the first solar panel SP ₁ .

In this case, the transmitter 150 may not transmit only the maintenance signal 1 included in the group signal corresponding to the photovoltaic panel 110 in which a dangerous situation is detected among the plurality of photovoltaic panels 110 . Accordingly, the receiver 130 of the solar panel 110 in which the dangerous situation is detected may control the MPPT 120 so that the connection between the corresponding solar panel 110 and the power grid GR is separated.

Specifically, the determination unit 132 of the plurality of receivers 130 stores different bit patterns for each of the plurality of solar panels 110 , and compares the stored bit patterns with the bit patterns of the demodulated sustain signal 1 and maintains them. Detect signal (1).

Here, the determination unit 132 detects only the same signal as the stored bit pattern among the plurality of received sustain signals 1 as the sustain signal. Accordingly, it is possible to individually control the connection between the plurality of solar panels 110 and the power grid GR according to a dangerous situation.

In the detailed description of the present invention, although specific embodiments have been described, various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention is not limited to the described embodiments, and should be defined by the following claims and their equivalents.

100: solar power system
110: solar panel
120: MPPT
130: receiver
140: inverter
150: transmitter

Claims (11)

at least one solar panel generating direct current power using solar energy;
MPPT operative to enable the solar panel to generate maximum power from the solar energy;
a power line for transmitting the DC power to a power grid;
a transmitter that modulates a maintenance signal composed of a multi-bit signal for controlling the MPPT using a spread spectrum modulation method, and transmits the maintenance signal in a stream form through the power line, but stops transmission of the maintenance signal in a dangerous situation; and
A receiver that controls the MPPT so that the maximum power is generated, receives the sustain signal from the transmitter, detects the received sustain signal, and controls the MPPT so that the solar panel and the power grid are separated or connected
A solar power system comprising a.
The method of claim 1,
The MPPT is
changing the output voltage of the solar panel according to the target voltage for following the maximum power output point
solar power system.
The method of claim 1,
An inverter connected to the power line and converting the DC power into AC power
A solar power system further comprising a.
The method of claim 1,
the receiver is
a decoder for demodulating the sustain signal;
a determination unit determining whether the sustain signal is detected;
a counter for incrementing a failure count whenever the sustain signal is not detected; and
If the failure count is greater than or equal to a reference count, a control unit for controlling the MPPT so that the solar panel and the power grid are separated
A solar power system comprising a.
The method of claim 1,
the receiver is
a decoder for demodulating the sustain signal;
a determination unit determining whether the sustain signal is detected;
a counter that increments a success count each time the sustain signal is detected; and
If the success count is greater than or equal to the reference count, a control unit for controlling the MPPT so that the solar panel and the power grid are connected
A solar power system comprising a.
The method of claim 1,
the receiver is
a decoder for demodulating the sustain signal;
a determination unit determining whether the sustain signal is detected;
a counter for increasing a detection period each time the sustain signal is demodulated and incrementing a success counter every time the sustain signal is detected; and
If the detection period is a reference period, and the success counter is greater than or equal to the reference counter, a control unit for controlling the MPPT so that the solar panel and the power grid are connected
A solar power system comprising a.
7. The method of claim 6,
the control unit
Controlling the MPPT such that the solar panel and the power grid are separated when the detection period is a reference period, and the success counter is less than the reference counter
solar power system.
8. The method of claim 7,
the counter is
To count the number of times of switching between the connection and disconnection of the solar panel and the power grid
solar power system.
9. The method of claim 8,
the control unit
If the number of switching is greater than or equal to the reference number, controlling the MPPT so that the solar panel and the power grid are separated.
solar power system.
4. The method of claim 3,
The hold signal is
grouped into a plurality of group signals, wherein the plurality of group signals have different bit patterns
solar power system.
11. The method of claim 10,
The judging unit
Storing the different bit patterns for each of the plurality of solar panels, and detecting the sustain signal by comparing the stored bit pattern with the bit pattern of the demodulated sustain signal
solar power system.

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