KR20160146398A - Fire protection and solar power systems using micro-converter - Google Patents

Abstract

The present invention relates to a solar power system which removes a reverse current prevention diode and an exhaust fan from a connection board, and does not perform a monitoring function, thereby simplifying configuration of the connection board. The solar power system comprises: a microconverter configured to correspond to a solar module, blocking string power, preventing reverse current, and performing a monitoring function; a fire measurement unit including a connection board for transferring direct current voltage outputted from the microconverter to an inverter in a lower end, in which the connection board detects a fire to prevent the fire; and a fire detection module including a microcontroller for determining a fire symptom based on the temperature, the humidity, CO_2, VOC, and an external temperature measurement value integrally detected in the fire measurement unit. By performing a string power blocking function, a reverse current prevention function, and a fire and power monitoring function in the microconverter, the connection board is simplified to have high reliability. And since heating is unnecessary by omitting a heating factor in the connection board, a dustproof and waterproof level of the connection board can be optimized to be suitable for outdoor installation specifications, thereby optimizing accuracy of the fire detection module additionally installed in properties of an enclosed structure without an exhaust fan. Therefore, the high reliability solar power system is realized.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a fire prevention and solar power generation system using a micro converter,

The present invention relates to a fire prevention and solar power generation using a micro-converter. In particular, a reverse current prevention diode and a heat exhaust fan are removed from a connection board, and a power monitoring function is performed in a micro- The present invention relates to a fire prevention and photovoltaic power generation system using a microconverter that improves reliability by using a hybrid fire detection module that simplifies the configuration of a connection panel and does not perform functions.

Generally, a large PV system is a structure in which a DC 1000 V high-voltage input lines from a string connecting a plurality of solar cell modules in series are connected in parallel to a connection panel, and a pair of DC output lines are connected to an inverter. In this case, since the power generation state between the strings is different, a reverse current may flow to specific arrays due to the voltage difference between the strings. To prevent this, a reverse current prevention diode is connected in series for each string, and an arc fault ), And the like for preventing the device from being burned due to the overcurrent. However, the fuse for the overcurrent does not operate due to the influence of the reverse current diode in case of an accident in the string, and in order to monitor each channel at the connection level, the AC power or the separate DC power is always applied, And a monitoring board.

On the other hand, since a large number of heat is generated in the reverse current prevention diode of the connection panel applied to a large solar power generation system, an additional heat dissipation unit is installed, but an additional heat dissipation is not performed only by the additional heat dissipation unit, And discharged to the outside of the connection board.

Fig. 1 is a schematic view of a connection panel and an array of a general large solar power generation system, and includes solar arrays 11 to 10N and a connection board 20. Fig.

The connection board 20 collects the high-voltage DC output lines output from the plurality of solar arrays 11 to 10N in a parallel form and outputs them to a pair of DC output lines.

The connection board 20 includes a fuse 21, a reverse current prevention diode 22, a monitoring board 23, a microconverter (MCCB) 24 and an exhaust fan 25. It is preferable that the fuse and the reverse current prevention diode are provided for each solar array.

For example, a cable is connected from a plurality of solar arrays 11 to 10N, and a normal line is connected to a power breaker 24 of MCCB, and a + line is connected to a fuse 21 and a reverse current After passing through the protection diode 22, it is bundled into one place and connected to the power source breaker 24. The output of the power breaker 24 is connected to the inverter at the rear end. In addition, a photovoltaic power generation system with a monitoring function per channel (per string) requires a digital board for monitoring, a current sensing device, a voltage sensor for voltage detection, and a shunt resistor. And a DC converting power supply for converting the DC to a DC are also needed.

On the other hand, a prior art for a photovoltaic device using a micro converter is disclosed in Patent Document 1 below.

In order to improve energy efficiency and cost reduction in the field of solar power generation system, the prior art disclosed in the above Patent Document 1 has a micro inverter converter in each solar module (PV module), and in the micro inverter converter It responds to environment / situation factors in real-time module unit, and performs power / environment monitoring.

Korean Registered Patent Registration No. 10-1245827 (Announced on March 20, 2013)

However, in the conventional solar photovoltaic generation system and the related art as described above, there is provided a connection panel in which a reverse current prevention diode and an exhaust fan for heat dissipation are installed. In general, the waterproof function of the connection panel installed outdoors is an exhaust fan, Resulting in unsatisfactory results.

In addition, a complicated digital board for monitoring is added to the connection module of a general solar power generation system, which not only complicates the configuration of the connection panel, but also lowers the reliability and increases the failure rate.

In addition, in the related art, various devices having different voltage and current ratings are arranged without being partitioned in the same enclosure, so that there is a danger of a high-low pressure interfering accident, and there is an opening for discharging the heat of the diode to the outside, Moisture and dust are introduced from the outside due to the circulation of air during operation of the exhaust fan and deposited in the conductor portion in the connection panel, leading to insulation breakdown, resulting in frequent occurrence of fire.

In addition, in the conventional technology, a reverse current diode is provided to prevent a reverse current to a string having a low power generation voltage. However, as a result, in a string formed between the solar cell module and the module in series, In the event of an accident, there is no reverse current flow, so that the string protection fuse installed in the connection panel does not operate and the DC accident occurs repeatedly in the field. As a result, if the overvoltage or overcurrent exceeds a predetermined value, Resulting in fire due to arc faults.

Accordingly, the present invention has been proposed in order to overcome the problems of the conventional large-scale solar power generation system and the related art, and instead of removing the reverse current prevention diode and the exhaust fan in the connection panel, To prevent fire by using a highly reliable micro-converter that has the function of blocking the circuit by sensing the fire risk before ignition by detecting the main fire factor and enhancing the waterproof and dustproof grade by simplifying the configuration of the connection panel And a solar power generation system.

It is another object of the present invention to provide a fire prevention system using a micro converter that eliminates the string monitoring function in a connection board and eliminates a need for a constant AC power source and all devices therefrom, And a solar power generation system.

It is still another object of the present invention to provide a fire prevention and solar power generation system using a micro-converter that can perform a reverse current prevention function in a specific micro-converter.

In order to accomplish the above object, a fire prevention and solar power generation system using a micro converter according to the present invention is configured to correspond to a solar module, Micro converter; And a connection unit for transmitting the DC power output from the micro-converter to the inverter of the subsequent stage,

Wherein the connection unit comprises: a fire measurement unit for detecting a fire to prevent fire; And a microcontroller including a microcontroller for determining a fire abnormality on the basis of temperature, humidity, CO2, VOC, and outside air temperature measured values integrated in the fire measuring unit.

The micro converter includes a voltage detector for detecting a voltage output from the solar module; A first current detector for detecting a current output from the solar module; A second current detector for detecting a reverse current; Based on the input current and reverse current detection value, it is judged whether reverse current or string power is cut off. The switch control signal is generated based on the result of judging whether reverse current or string power is cut off, A main control unit (MCU); A communication module for communication between the main control unit and another micro-converter; And a power control unit for outputting or interrupting an input voltage to a rear stage inverter according to a switch control signal generated in the main control unit.

The main control unit measures an input current to determine whether the string power is cut off, and measures an output current of the power control unit to determine a reverse current.

The connection unit includes a fuse for blocking the overcurrent, and a power breaker for transmitting the voltage passed through the fuse to the inverter at the rear end.

According to an aspect of the present invention, there is provided a fire prevention and solar power generation system using a micro-converter, including: a micro-converter interposed between a plurality of solar modules; A string controller coupled to the micro-converter to shut off the string power, prevent reverse current and perform a monitoring function; And a connection unit for transmitting the DC voltage output from the string controller to the inverter of the subsequent stage.

Wherein the string controller comprises: a voltage detector and a first current detector for detecting a current and a reverse current output from the micro-converter; A second current detector for detecting a current outputted to the inverter as a reverse current; A main control unit for determining whether or not a reverse current or a string power is cut off and generating a switch control signal based on a determination result of a reverse current or a string power cutoff and controlling the transmission of voltage and current measurement values for tracking the maximum power point; A communication module for communicating with the micro-converter; And a power control unit for outputting an input voltage to the inverter according to a switch control signal generated in the main control unit or for interrupting the circuit in accordance with a cutoff signal and a fire abnormality indication signal in the connection unit.

The main control unit measures an input current to determine whether the string power is cut off, and measures an output current of the power control unit to determine a reverse current.

The connection unit includes a fuse for blocking the overcurrent, and a power breaker for transmitting the voltage passed through the fuse to the inverter at the rear end.

According to the present invention, since there is no reverse current prevention diode in the connection half, it is not necessary to provide a separate heat dissipation part, an exhaust fan and an opening part because there is no heat, and a microcomputer performs a monitoring function in a wireless manner, It is not necessary to use AC power at all times. As a result, it is possible to reduce the construction cost of the auxiliary equipment such as communication and AC power supply line and surge protection equipment, .

In addition, according to the present invention, there is an advantage that the precision of the fire monitoring module can be realized in a sealed connection panel because there is no flow of internal air according to the elimination of the heat generating portion and the exhaust fan in the connection panel.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view of a connection panel and a solar array applied to a general solar power generation system;
2 is a configuration diagram of a series type micro-converter applied to a solar power generation system,
3 is a configuration diagram of a parallel-type micro-converter and a string controller applied to a solar power generation system,
FIG. 4 is a block diagram of a first embodiment of a fire prevention and solar photovoltaic generation system including a serial type micro-converter having a smart connection part and a string power shutdown and reverse current prevention function according to the present invention.
FIG. 5 is a block diagram of a second embodiment of a fire prevention and solar power generation system including a smart controller and a string controller having a string power cutoff function and a reverse current prevention function according to the present invention.
6 is a configuration diagram of a micro converter or a string controller having a reverse current prevention function and a string voltage cutoff function applied to the present invention,
FIG. 7A is a flowchart showing a reverse current prevention process in the present invention, FIG. 7B is a flowchart showing a string voltage cutoff process in the present invention,
FIG. 8 is a block diagram of a fire prevention and photovoltaic power generation system including a fire monitoring module, which is configured in the smart connection panel of the present invention,
FIG. 9A is a flowchart illustrating a process of detecting a fire abnormality and generating a digital signal according to an exemplary embodiment of the present invention. FIG.
FIG. 9B is a flowchart illustrating a process of blocking a circuit in a micro converter by receiving a fire abnormality determination digital signal in the present invention. FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a fire prevention and solar power generation system using a micro converter according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 4 is a block diagram of a fire prevention and solar power generation system according to a first embodiment of the present invention, which includes a serial type micro converter having a smart connection module and a string power cutoff and reverse current prevention function.

The first embodiment of the fire prevention and solar power generation system using the micro converter according to the present invention includes the solar module 110, the micro converter 120, and the connection unit 130.

The micro-converter 120 is configured to correspond to the solar module 110, blocks the string power, prevents reverse current, and performs a monitoring function.

As shown in FIG. 6, the micro-converter 120 has a one-to-one correspondence with the photovoltaic module, and includes a voltage detector 121 for detecting a voltage output from the photovoltaic module 110; A first current detector 122 for detecting the current output from the solar module 110; A second current detector 123 for detecting a reverse current; Based on the input current and reverse current detection value, it is judged whether reverse current or string power is cut off. The switch control signal is generated based on the result of judging whether reverse current or string power is cut off, A main control unit (MCU) 124; A communication module 125 for communication between the main control unit 124 and another micro-converter; And a power control unit 126 for outputting or interrupting the input voltage to the inverter at the following stage according to the switch control signal generated by the main control unit 124. [

In this case, the main control unit 124 may measure the input current to determine whether the string power is off, and measure the output current of the power control unit 126 to determine the reverse current.

The connection unit 130 transmits the DC voltage output from the micro-converter 120 to the inverter of the subsequent stage.

The connection block 130 includes a fuse 131 for blocking the overcurrent and a power breaker 132 for transmitting the voltage passed through the fuse 131 to the inverter at the rear stage.

The operation of the first embodiment of the photovoltaic generation system having the smart connection unit of the present invention and the series micro-converter having the string power cutoff function and reverse current prevention function will be described in detail.

First, as shown in FIG. 2, the fire prevention and solar power generation system using a micro converter is applied to the input of a micro-converter 2 connected in a one-to-one manner with the output of the solar module 1, 3, a microconverter 5 is provided between the solar modules 4 as shown in FIG. 3, and a string controller (not shown) is connected to the last solar module in units of strings, And a parallel type micro-converter type system in which the microcomputer 6 is provided.

FIG. 4 shows a fire prevention and solar power generation system using a micro-converter to which the preferred embodiment of the present invention is applied in the case where the solar power generation system has a serial type micro-converter structure.

The voltages Vpv (+) output from the respective solar modules 110 are input to the micro-converters 120 connected in a one-to-one correspondence manner. The voltage detector 121 of the micro-converter 120 detects the level of the input voltage and transmits the voltage detection value AV to the main control unit 124. The first current detector 122 detects the level of the input current And transmits the current detection value (AI) to the main control unit 124.

The main control unit 124 compares an input voltage detection value and a current detection value with preset voltage and current reference values for blocking the string voltage so that the voltage detection value is greater than the voltage reference value, If it is larger than the current reference value, it is judged that the string voltage is cut off, and a switch control signal for cutting off the string voltage is generated. In response to the switch control signal for blocking the string voltage, the power supply control unit 126 opens the internal switch (off state) to block the voltage output from the solar module from being transmitted to the connection unit 130 at the downstream stage. Of course, when the voltage detection is below the voltage reference value and the current detection value is below the current reference value, the string voltage cutoff operation is not performed. In this case, the internal switch of the power control unit 126 is closed (ON state), and the voltage output from the solar module is transmitted to the connection unit 130 at the subsequent stage.

In addition, the micro-converter 120 detects the current flowing to the connection block 130 through the second current detector 123 to prevent current from flowing in the reverse direction. At this time, the detected current value is transmitted to the main control unit 124 at the reverse current detection value AI2. For example, when a potential difference occurs between strings, a reverse current flows through a specific string. Therefore, a reverse current protection circuit (RCP) is implemented inside one microconverter in the string, and reverse current is cut off when reverse current is detected. The main control unit 124 compares the detected reverse current detection value with a preset reverse current reference value to determine whether the reverse current is present, and when the reverse current detection value is smaller than the reverse current reference value, And does not perform power control. If the reverse current detection value is greater than the reverse current reference value, it is determined that a reverse current flows and a switch control signal for preventing reverse current is transmitted to the power control unit 126. The power supply control unit 126 opens the internal switch according to the switch control signal for preventing the reverse current from being transmitted, thereby blocking the current from flowing to the connection unit 130. The internal switch may be implemented as an FET switch. The main control unit 124 performs a PWM operation during normal operation and disconnects the output power, that is, the string power, when the reverse current is sensed.

In addition, the communication module 125 transmits the voltage and current values detected from the solar module in accordance with the control of the main control unit 124 to other micro-converters or controllers to be used for tracking the maximum power point. By separately monitoring the power of the photovoltaic modules in the microconverters, there is no need to perform the power monitoring function in the connection module.

Next, the connection block 130 receives the voltages Vout (+) and Vout (-) output from the respective micro-converters 120 through the fuse 131 and the voltage passing through the fuse 131 And then transmitted to the power breaker 132. [ At this time, the fuse 131 is automatically short-circuited when an overcurrent greater than a predetermined current flows, thereby preventing an overcurrent from being applied to the subsequent stage. Likewise, the power breaker 132 detects an input current and blocks supply of power to the string inverter of the subsequent stage when an overcurrent greater than a predetermined current flows.

As described above, in the first embodiment of the present invention, in order to solve the problems occurring in the conventional connection module in the series micro-converter system, the string power cut-off and the reverse current prevention function are configured in the micro- Reverse current prevention function, and power monitoring function. This eliminates the need to implement a reverse current protection diode in the connection panel, eliminates the need for a separate exhaust fan for heat dissipation, and eliminates the need for a continuous AC power source because there is no need for a monitoring digital board for power monitoring. Therefore, it becomes possible to design a connecting device with a smaller size, and an exhaust fan is not required, so that a waterproof function can be optimally realized.

The reason why monitoring is not required in the above-mentioned connection module is that it is not necessary to add a digital board for monitoring to the connection module since the individual monitoring can be performed when the microconverter is installed.

FIG. 5 shows a fire prevention and solar power generation system using a micro-converter to which a preferred embodiment of the present invention is applied in the case where the solar power generation system has a parallel type micro-converter structure.

The second embodiment of the fire prevention and solar power generation system using the micro converter according to the present invention includes the solar module 210, the string controller 220, and the connection module 230. Although not shown in the figure, as shown in Fig. 3, a parallel type microconverter for power supply control is provided between actual solar modules. Hereinafter, the second embodiment of the present invention will be described as applied to a solar power generation system having a parallel type micro-converter.

The string controller 220 blocks the string power, prevents reverse current, and performs a monitoring function.

As shown in FIG. 6, the string controller 220 includes a voltage detector 121 and a first current detector 122 for detecting the current and the reverse current output from the micro-converter. A second current detector 123 for detecting a current output to the inverter as a reverse current; A main control for generating a switch control signal based on a determination result of a reverse current or a string power off determination and controlling transmission of voltage and current measurement values for a maximum power point tracking (MPPT) Unit 124; A communication module 125 for communication with the micro-converter; And a power control unit 126 for outputting or interrupting the input voltage to the inverter according to a switch control signal generated in the main control unit 124.

The circuit shown in Fig. 6 is a circuit for the microconverter shown in Fig. 4. In the case where the solar power generation system is a system using a parallel type microconverter, the string controller 220, like the microconverter shown in Fig. 4, Prevention function, string voltage cutoff function, and power monitoring function.

The connection block 230 includes a fuse 231 for blocking an overcurrent and a power breaker 232 for transmitting a voltage passed through the fuse 231 to a rear inverter.

A second preferred embodiment of the present invention will be described in detail below.

First, the voltage Vpv (+) output from each solar module 110 passes through a microconverter interposed between the solar modules. In addition, a string controller 220 is provided in the last solar module in a string unit.

The voltage passing through the last micro-converter and the solar module is input to the string controller 220. The voltage detector 121 of the string controller 220 detects the level of the input voltage and transmits the voltage detection value AV to the main control unit 124. The first current detector 122 detects the level of the input current And transmits the current detection value (AI) to the main control unit 124.

The main control unit 124 compares an input voltage detection value and a current detection value with preset voltage and current reference values for blocking the string voltage so that the voltage detection value is greater than the voltage reference value, If it is larger than the current reference value, it is judged that the string voltage is cut off, and a switch control signal for cutting off the string voltage is generated. In response to the switch control signal for blocking the string voltage, the power supply control unit 126 opens the internal switch (off state) to block the voltage output from the microconverter from being transmitted to the subsequent connection unit 230. Of course, when the voltage detection is below the voltage reference value and the current detection value is below the current reference value, the string voltage cutoff operation is not performed. In this case, the internal switch of the power control unit 126 is closed (ON state), and the voltage output from the micro-converter is transmitted to the connection unit 230 at the subsequent stage.

In addition, the string controller 220 detects the current flowing to the connection block 230 through the second current detector 123 in order to prevent the current from flowing in the reverse direction. At this time, the detected current value is transmitted to the main control unit 124 at the reverse current detection value AI2. For example, when a potential difference occurs between strings, a reverse current flows through a specific string. Therefore, one string controller in the string implements a reverse current protection (RCP) inside the string controller to block the reverse current when a reverse current is detected. The main control unit 124 compares the detected reverse current detection value with a preset reverse current reference value to determine whether the reverse current is present, and when the reverse current detection value is smaller than the reverse current reference value, And does not perform power control. If the reverse current detection value is greater than the reverse current reference value, it is determined that a reverse current flows and a switch control signal for preventing reverse current is transmitted to the power control unit 126. The power supply control unit 126 opens the internal switch according to the switch control signal for preventing the reverse current to be transmitted, and blocks current from flowing to the connection unit 230. The internal switch may be implemented as an FET switch. The main control unit 124 performs a PWM operation during normal operation and disconnects the output power, that is, the string power, when the reverse current is sensed.

In addition, the communication module 125 transmits the voltage and current values detected from the solar module under the control of the main control unit 124 to the micro-converter to be used for tracking the maximum power point. The parallel microcontroller system requires a string controller for each string because the microcontroller can not find its own maximum output point (MPP). For this purpose, the string controller is equipped with voltage and current measurement and maximum output point tracking (MPPT) algorithm And a communication module for communicating with the micro-converter to perform the communication. By separately monitoring the power of the photovoltaic module in the string controller 220, it is not necessary to perform the power monitoring function in the connection module 230.

Next, the connection block 230 receives the voltages Vout (+) and Vout (-) output from the respective string controllers 220 through the fuse 231 and the voltage passing through the fuse 231 And then transmitted to the power breaker 232. [ At this time, the fuse 231 is short-circuited automatically when an overcurrent greater than a predetermined current flows, thereby preventing an overcurrent from being applied to the subsequent stage. Likewise, the power breaker 232 detects the input current and blocks the supply of power to the string inverter at the latter stage when an overcurrent greater than a predetermined current flows.

In the second embodiment of the present invention, in order to solve the problems occurring in the conventional connecting module in the parallel micro-converter system, the string power supply cut-off and the reverse current prevention function are configured in the string controller, Reverse current prevention function, and power monitoring function. This eliminates the need to implement a reverse current protection diode in the connection panel, eliminates the need for a separate exhaust fan for heat dissipation, and eliminates the need for a continuous AC power source because there is no need for a monitoring digital board for power monitoring. Therefore, it becomes possible to design a connecting device with a smaller size, and an exhaust fan is not required, so that a waterproof function can be optimally realized.

The reason why monitoring is unnecessary in the connection module is that it is not necessary to add a digital board for monitoring to the connection module because the string controller can individually monitor the reason.

FIG. 7A is a flowchart illustrating a reverse current prevention process in the present invention, and FIG. 7B is a flowchart illustrating a string voltage cutoff process in the present invention.

As shown in FIG. 7A, when a reverse current is sensed, a string switch (a switch of a power source control unit) is turned off to prevent reverse current. In addition, when reverse current is not detected, normal operation is performed.

As shown in FIG. 7B, the string voltage is detected, and when the overcurrent flows, the string switch (switch of the power supply control unit) is turned off to block the overcurrent from flowing to the inverter. If no overcurrent is detected, normal operation is performed.

FIG. 8 is a block diagram of a fire prevention and solar power generation system using a micro-converter including a fire monitoring module 240 configured in a smart connection module and determining a fire abnormal condition in a connection module of the present invention.

The fire monitoring module 240 includes a fire measuring unit 246 for detecting a fire to prevent fire; A microcontroller 242 for determining a fire abnormality on the basis of the temperature, humidity, CO2, VOC, and outdoor air temperature measurement value of the integrated door detected by the fire measurement unit 246; And a wireless signal transmitter 241 for converting the signal of the fire abnormality signal into a wireless signal in association with the microcontroller 242 and transmitting the signal to the micro converter 120 or the string controller 220.

Here, the fire measuring unit 246 includes a temperature / humidity measuring unit 243 for measuring temperature and humidity in the connecting panel; A gas measurement unit 245 for measuring gas such as CO 2 and VOC in the connection panel; And an external temperature measuring unit 244 for measuring the outside air temperature.

In addition, a fire prevention and solar power generation system using a micro-converter may include a micro power storage device 263 for supplying the stable 24-hour self-power of the fire monitoring module 240, a unidirectional DC converter 262 A constant voltage regulator 261 and a small solar cell module 260,

9A is a microcontroller (FIG. 9A) including logic for determining a fire anomaly based on the measurement information of the temperature and humidity measurement unit 243, the gas (CO2 concentration, VOC concentration) measurement unit 245 and the external temperature measurement unit 244 242 to determine a fire abnormality and transmit a signal.

9B is a flowchart illustrating a process of receiving an abnormal signal in the micro converter 120 or the string controller 220 to notify the central control system of a fire alarm and controlling the string voltage to shut off the circuit.

The fire monitoring module 240 is installed in the connection block 230 and wirelessly interlocks with the micro converter 120 or the string controller 220 included in the local string to monitor the fire and shut off the string circuit in the determination of an abnormal signal . Particularly, the fire prevention and photovoltaic power generation system according to the present invention employing local network type wireless communication is not affected by a situation where communication with the central control system is interrupted temporarily or locally, and performs a stable function A reference value and a determination condition are input to the fire monitoring module 240 in advance so that the control operation is performed through comparison.

As shown in FIG. 8, after a circuit break in the micro-converter 120 or the string controller 220, a logic for checking an abnormality in a circuit breaking state is interlocked with a separate central control system 250, There is also a function that can restart when the condition is established, so that the stability can be ensured while minimizing power generation loss caused by circuit break due to device error.

Although the present invention has been described in detail with reference to the above embodiments, it is needless to say that the present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the spirit of the present invention.

The present invention can be effectively applied to a reverse current prevention, a string power cutoff, and a heat dissipation function in a solar power generation system.

110, 210: Photovoltaic module
120: micro converter
124: Main control unit (MCU)
125: Communication module
126:
130 and 230:
220: String controller
240: Fire monitoring module
241: Radio signal transmitter
242: Microcontroller
243: Temperature and humidity meter
244: External temperature measuring unit
245: Gas measurement section
250: Central control system
260: Small Solar Cell Module
261: Constant-voltage regulator
262: Unidirectional constant voltage DC converter
263: Micro power storage device

Claims (11)

A micro-converter configured to correspond to the solar module, which blocks the string power, prevents reverse current and performs a monitoring function; And
And a connection half for transmitting the DC voltage output from the micro-converter to the inverter at the subsequent stage,
Wherein the connection unit comprises: a fire measurement unit for detecting a fire to prevent fire; And a microcontroller for determining a fire abnormality on the basis of temperature, humidity, CO2, VOC, and outside air temperature measured values integrated in the fire measuring unit, and a microcontroller Fire protection and solar power system.
The microcontroller according to claim 1, further comprising: a voltage detector for detecting a voltage output from the solar module; A first current detector for detecting a current output from the solar module; A second current detector for detecting a reverse current; Based on the input current and reverse current detection value, it is judged whether reverse current or string power is cut off. The switch control signal is generated based on the result of judging whether reverse current or string power is cut off, A main control unit (MCU); A communication module for communication between the main control unit and another micro-converter; And a power control unit for outputting or interrupting an input voltage to a rear stage inverter according to a switch control signal generated in the main control unit.
The main control unit determines the reverse current by measuring the output current of the power control unit, determining whether the string power is cut off by measuring the input current, and determining the reverse current. system.
The fire prevention and solar power generation system using the micro converter according to claim 1, wherein the connection panel includes a fuse for blocking an overcurrent, and a power breaker for transmitting a voltage passed through the fuse to a rear inverter.
A string controller connected to the microconverter interposed between the plurality of solar modules for blocking the string power, preventing reverse current and performing a monitoring function; And
And a connection panel for transmitting the DC voltage output from the string controller to the inverter of the subsequent stage,
Wherein the connection unit comprises: a fire measurement unit for detecting a fire to prevent fire; And a microcontroller for determining a fire abnormality on the basis of temperature, humidity, CO2, VOC, and outside air temperature measured values integrated in the fire measuring unit, and a microcontroller Fire protection and solar power system.
6. The microcontroller of claim 5, wherein the string controller comprises: a voltage detector and a first current detector for detecting current and reverse current output from the micro-converter; A second current detector for detecting a current outputted to the inverter as a reverse current; A main control unit for determining whether or not a reverse current or a string power is cut off and generating a switch control signal based on a determination result of a reverse current or a string power cutoff and controlling the transmission of voltage and current measurement values for tracking the maximum power point; A communication module for communicating with the micro-converter; And a power controller for outputting or interrupting an input voltage to the inverter according to a switch control signal generated in the main control unit.
Wherein the main control unit measures an input current to determine whether a string power is cut off and measures an output current of the power control unit to determine a reverse current. system.
The fire prevention and solar power generation system using the micro converter according to claim 5, wherein the connection unit includes a fuse for blocking an overcurrent, and a power breaker for transmitting a voltage passed through the fuse to a rear inverter.
The fire monitoring module according to claim 1 or 5, further comprising: a fire measuring unit for detecting a fire to prevent fire; A microcontroller for determining a fire abnormality on the basis of temperature, humidity, CO2, VOC, and outdoor air temperature measurement values integrated in the fire sensing unit; And a wireless signal transmitter for transmitting a signal indicating a fire anomaly signal to the microcontroller or the string controller in association with the microcontroller, and transmitting the signal to the microcontroller or the string controller.
According to claim 9, the fire measuring unit includes: a temperature and humidity measuring unit for measuring a temperature and a humidity in the connection panel; A gas measuring section for measuring gas such as CO2 and VOC in the connection panel; And an external temperature measuring unit for measuring the temperature of the outside air.
The microcontroller according to claim 1 or 5, further comprising a central control system interlocked with the micro-converter or the string controller to control the micro-converter or the string controller,
The central control system performs an area blocking function to prevent secondary expansion from an alarm or a primary fire of a corresponding level based on a fire alarm signal and a string blocking signal of a connection board, Wherein the microcomputer is operative to perform a zone blocking-restoring function for sending a restart command to the micro-converter.

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