KR101429421B1 - Smart connector band unit for photovoltaic power generation system - Google Patents

Abstract

The present invention relates to an intelligent connector band unit for photovoltaic power generation, which is installed between plural unit solar cell arrays (10, 10′ and 10′′), each of which has plural solar cell modules (M) to form a unit, and plural unit inverters (20, 20′ and 20′′), each of which converts DC power output from the unit solar cell array into AC power. An intelligent connector band unit, which is installed between a unit solar cell array (10, 10′ or 10′′) and a unit inverter (20, 20′ or 20′′), includes a unit connector band (31, 31′ or 31′′) for combining DC power output from plural solar cell modules (M) and for outputting the combined DC power to each unit inverter (20, 20′ or 20′′); a unit surge protector (32, 32′ or 32″) connected to the unit connector band (31, 31′ or 31′′) to prevent a surge from being applied to the unit connector band (31, 31′ or 31′′) while bypassing the surge when the surge is generated from a specific unit solar cell array; and a unit surge protector operating signal generating unit (33, 33′ or 33″) connected to the unit connector band (31, 31′ or 31′′) to generate a surge protector operating signal for informing the operation of a specific unit surge protector when the specific unit surge protector is operated.

Description

TECHNICAL FIELD [0001] The present invention relates to an intelligent connection half unit for a photovoltaic power generation system,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an intelligent connection half unit for solar power generation for integrally managing a plurality of solar cell arrays, and more particularly, And an intelligent connection half unit for a photovoltaic power generation system capable of grasping this and taking immediate action.

Solar power generation is a power generation method that directly converts sunlight into electric energy using solar cell. Such solar power generation is attracting attention as a new energy source due to the depletion of fossil fuels and pollutants generated when fossil fuels are burned.

Currently, general PV power generation is used by directly supplying the generated power to the load of the home or factory by minimizing the influence of the distributed power supply system, protecting the system against accidents, improving the inverter control technology, and using unused surplus power Is a grid-connected system that supplies the system linked to KEPCO.

The grid-connected photovoltaic power generation system includes a solar cell array in which solar cell modules are connected in series or in parallel, an inverter for converting DC power output from the solar cell array into AC power, And a connection half for outputting the combined DC power output from the solar cell module to the inverter, and the inverter is connected to the commercial system of KEPCO. At this time, a fuse, a reverse current prevention diode, and the like are installed in the connection half for improving the distribution efficiency and the safety function. Background Art [0002] A prior art of a solar power generation system related to this is disclosed in the Laid-Open Patent Application No. 10-1998-020431 as a grid-connected solar power generation device. Such a photovoltaic power generation system monitors the total generation voltage and current generated in the solar cell array to monitor whether it is in normal power generation.

However, in the case of the above-described solar power generation system, the connection half is broken by the surge generated when the solar battery array is hit by the lightning strike, and further, the inverter is broken by the inverter connected with the connection half.

Further, when grounding or short-circuiting has occurred, it has not been known, and the amount of power generated thereby is reduced.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide an intelligent connection for photovoltaic power generation capable of preventing the inverter from being damaged when a specific unit solar cell array is subjected to a lightning strike, It is intended to provide a half unit.

Another object of the present invention is to provide an intelligent connection half unit for solar power generation capable of grasping a ground fault or a short circuit in a specific unit solar cell array so as to take an immediate action.

In order to achieve the above object, the intelligent connection half unit for solar photovoltaic power generation according to the present invention comprises a plurality of unit solar cell arrays 10, 10 '(a plurality of solar cell modules M' 10 "), and a plurality of unit inverters 20 (20 ') and 20" for converting DC power output from the unit solar cell array into AC power, wherein the unit solar cell array 10 And the unit inverters 20, 20 'and 20' ', respectively. The direct current power outputted from the plurality of solar cell modules M is combined with each unit Unit connection blocks 31, 31 'and 31' 'for outputting to the inverters 20, 20' and 20 ''; Is connected to each of the unit connection units 31, 31 'and 31' '. When a surge occurs in a specific unit solar cell array, the surge is not applied to the unit connection unit, Unit surge protector 32 (32 ') 32 " The unit surge protector operation signal generating unit, which is connected to each of the unit connection units 31, 31 'and 31' ', generates a surge protector operation signal indicating that the unit surge protector is activated when a specific unit surge protector is activated (33) 33 ' (33 "); A unit transfer part 35 ', 35' 'connected to each of the unit connection parts 31, 31' and 31 '' for transmitting the respective surge protector operating signals; Unit breakers 36, 36 ', and 36' 'installed between the unit solar cell arrays 10, 10', and 10 '' and the unit connection units 31, 31 ', and 31' '; And receives lightning forecast data from the weather station and selectively disconnects or connects the line between the unit solar cell arrays 10, 10 ', 10 "and the unit connection units 31, 31', 31" And a blocking data receiver 37 (37 ') 37' 'for controlling the operation of the unit breaker 36 (36') 36 ''.

In the present invention, unit power amount signal generators 34 and 34 'that detect the amount of power generated in each of the unit solar cell arrays 10''and10''and generate a power amount signal corresponding to the amount of power, Quot; 34 ".
The unit transmitters 35, 35 'and 35' transmit the respective power amount signals.
In the present invention, the server S communicates with a server S installed at a remote location remote from the unit solar cell array 10, 10 ', 10''and managed in real time by an administrator, A power amount comparison unit 40 for comparing the plurality of power amount signals of the plurality of power amount signals with each other and detecting an abnormal power amount signal when the generated power amount deviates from a set error value range; And an abnormal operation notifying unit 50 notifying that an abnormal operation has occurred in the battery array.

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According to the present invention, by employing a plurality of unit surge protector connected to a plurality of unit solar cell arrays, it is possible to prevent the unit inverter from being damaged when a lightning strike is hit. Further, by employing a unit surge protector operation signal generating unit, It can be seen that the solar cell array was hit by a lightning stroke.

Further, by employing a plurality of unit breakers and a cut-off data receiver, it is possible to prevent the lightning accident by blocking the line between the unit solar cell array and the unit connection unit when there is a lightning forecast.

Further, by employing a plurality of unit power quantity signal generators for detecting the amount of power generated in each of a plurality of unit solar cell arrays and generating a power amount signal, it is possible to recognize when a ground fault or a short circuit occurs in a specific unit solar cell array, Management can be taken immediately, and power generation efficiency can be improved.

Further, each of the plurality of unit solar cell arrays can be managed remotely, and real-time monitoring and management can be performed.

1 is a view for explaining a configuration of an intelligent connection unit for a solar power generation according to the present invention,
FIG. 2 is a diagram illustrating the configuration of the unit power amount signal generating unit of FIG. 1; FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an intelligent connection unit for solar power generation according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a view for explaining a configuration of an intelligent connection half unit for solar photovoltaic power generation according to the present invention, and FIG. 2 is a drawing showing a configuration of a unit power amount signal generation unit of FIG.

The intelligent connection half unit for solar power generation according to the present invention is applied to a solar power generation complex that includes a plurality of unit solar cell arrays each comprising a plurality of solar cell modules M to enable large-scale solar power generation .

In this embodiment, for the sake of easier explanation, the number of unit solar cell arrays 10, 10 'and 10' 'that are located apart from each other is limited to three, and the unit solar cell arrays 10 and 10' 20 ", 20 "by the intelligent connection half units 30, 30 'and 30" of the present invention.

The intelligent connection half units 30, 30 'and 30' 'for the solar power generation of the present invention include a plurality of unit solar battery arrays 10 and 10' (a plurality of solar battery modules) 10 "), and a plurality of unit inverters 20, 20 ', 20" for converting DC power output from the unit solar cell array into AC power.

In detail, the intelligent connection unit 30 (30 ') 30' 'connects the unit solar cell arrays 10', 10 'and 10' 'and the unit inverters 20' and 20 ' And a unit connection board 31 for merging the DC power output from the plurality of solar cell modules M and outputting the combined DC power to the respective unit inverters 20, 20 'and 20' ', Are connected to the unit connecting plates 31 ', 31' 'and 31' ', 31' ', respectively, and when a surge occurs in a specific unit solar cell array, Unit surge protector 32 (32 ') 32' 'for bypassing the unit surge protector 32 and for bypassing to the ground while being connected to each unit connection panel 31 (31') and 31 '', A unit surge protector operating signal generating unit 33, 33 ', 33' 'for generating a surge protector operating signal that the unit surge protector is activated when the protective unit is operated, and a unit solar cell array 10' 10 " A unit power amount signal generating unit 34 (34 ') 34' 'for detecting a generated amount of power and generating a power amount signal corresponding to the amount of power, and a unit power amount signal generating unit 34' Unit transfer units 35, 35 'and 35' 'for transferring respective surge protector operating signals and power amount signals, as unit-connected solar cell arrays 10, 10' and 10 ' Unit breakers 36, 36 ', and 36' ', respectively, installed between the first, second, and third circuit units 31, 31', and 31 ''; The unit circuit breaker 36 (or the unit circuit breaker) is provided to receive lightning forecast data from the weather station and block the line between the unit solar cell arrays 10, 10 ', 10' 'and the unit connection units 31, 31' (37 '') 37 '' for controlling the operation of the wireless communication device (36 ') 36' '.

This intelligent connection unit 30 (30 ') 30' 'is installed at a remote location remote from the unit solar cell array 10 (10') 10 '' and is connected to the server S, And the server S is controlled by the server S by communicating with the server S. The server S compares the transmitted plurality of power amount signals with each other and detects a power amount signal when the generated power amount deviates from the set error value range 40); And an abnormal operation notifying unit (50) for notifying that an abnormal operation has occurred in the unit solar cell array when a surge protector operation signal and an abnormal power amount signal are generated.

Each of the plurality of unit solar cell arrays 10, 10 'and 10' 'is realized by connecting solar cell modules M composed of a plurality of solar cells in the horizontal and vertical directions, The solar cell module M is composed of eight to twelve solar cells connected in series, and outputs DC power having a voltage of about 300 to 700 V.

Each of the plurality of unit inverters 20, 20 'and 20' 'is connected to a DC power supply unit 31' Power. The alternating current power generated by the unit inverters 20, 20 'and 20' 'is directly supplied to a load of a home or a factory or the unused surplus power is supplied to a system connected to the KEPCO.

Each of the unit connection modules 31, 31 ', and 31' 'constituting the intelligent connection semiconducting unit of the present invention includes a plurality of unit connection solar cells 10', 10 ', and 10' A fuse that is cut off when an overcurrent flows to the output terminal of the unit solar cell array, and a backflow prevention diode for preventing reverse flow from the unit inverter.

Each of the unit surge protector 32 (32 ') 32' 'is connected to the input terminal of the unit connection panel 31 (31') 31 '', and when a surge occurs in a specific unit solar cell array To prevent the surge from being applied to the unit connection half and to bypass the ground. At this time, since the unit surge protector must have a high reaction speed so that the surge is not applied as a unit connection half, it is preferable to adopt a high-speed semiconductor such as a metal oxide varistor.

Each of the unit surge protector operating signal generators 33, 33 ', 33' 'generates a corresponding surge protector operating signal when a particular unit surge protector is activated, in which case the particular unit solar cell array is lightning- It makes sense.

When a unit solar cell array is subjected to a lightning stroke, the unit solar cell array generates surges of several hundred thousand volts or more. Even if a unit surge protector is operated and the surge is bypassed to the ground, there is a high possibility that the unit solar cell array is damaged. Therefore, if a specific unit of surge protection works, the unit solar cell array must be checked for damage. To this end, a unit surge protector operating signal generator is used which generates a surge protector operating signal when a specific unit surge protector is activated.

The unit power amount signal generators 34, 34 'and 34' detect the amount of power (voltage and current) generated in each unit solar cell array 10, 10 'and 10' ', And generates a specific power amount signal corresponding to the unit solar cell array according to the value corresponding to the unit solar cell array. The amount of power generated in each unit solar cell array can be known by the power amount signal.

Since the unit solar cell arrays 10, 10 ', 10 "are exposed to the outside, a ground fault or a short circuit occurs when the temperature and the humidity change over time. In this case, The amount of produced electricity is reduced even when an abnormality occurs in the solar cell module M constituting the unit solar cell array, or when a short circuit or a short circuit occurs.

When a power supply is reduced in a specific unit solar cell array due to a ground fault, a short circuit, a short circuit or a short circuit, the unit power amount signal generating units 34, 34 'and 34 " When the amount of power is reduced in the specific unit solar cell array, the reduced power amount generated in the corresponding unit solar cell array is detected to generate a corresponding power detection signal. The unit power amount signal generating unit 34 ', 34' Includes a voltage detection unit 34a, a current detection unit 34b, an analog / digital conversion unit 34c, and a digital filter 34d

The voltage detection unit 34a detects the voltage output from the unit solar cell array and outputs the output voltages of the + and - terminals of the unit solar cell array to the voltage that can be applied to the analog / digital conversion unit 34c So that accurate voltage measurement can be performed.

The current detection unit 34b detects the current output from the unit solar cell array.

The analog-to-digital converter 34c converts the measured voltage and current value from an analog signal to a digital signal using a microprocessor and outputs the digital signal.

The digital filter 34d extracts a desired digital value by removing noise from the digital signal converted by the analog / digital conversion unit 34c.

The unit transfer units 35, 35 'and 35' 'transmit the surge protector operation signal and the power amount signal corresponding to each of the plurality of unit solar cell arrays, wherein the surge protector operation signal and the power amount signal are transmitted wirelessly For example, Zigbee, and the like.

The unit circuit breakers 36, 36 'and 36' 'are controlled by the cut-off data receivers 37, 37' and 37 '' so that the unit solar cell arrays 10, 10 'and 10' (31), (31 ') and (31' ').

The cut-off data receivers 37, 37 'and 37' 'receive lightning forecasts from the weather station so that each of the unit breakers 36, 36' and 36 '' is connected to the line between the unit solar cell array and the unit connection half . Accordingly, the lightning accident can be fundamentally prevented. In particular, since the time when a lightning stroke occurs is dark or nighttime due to a lot of clouds, even if the line between the unit solar cell array and the unit connection unit is cut off by the lightning forecast, the total solar power generation amount does not change much.

The power amount comparing unit 40 constituting the server S compares the power amount signals independently transmitted from each of the unit transmitting units 35, 35 ', and 35 " (10 ') and 10' ', and generates an abnormal power amount signal when the generated power amount deviates from the set error value.

When a plurality of unit solar cell arrays are operated normally, all the power amount signals have the same value. If a reduction in the amount of power is caused by a ground fault, a short circuit, a short circuit, or a short circuit in a specific unit solar cell array, It is different from the power quantity signal generated in other solar cell arrays that operate.

The power amount comparing unit 40 compares the power amount signals corresponding to the amount of power generated in each unit solar cell array so that the power amount comparing unit 40 can recognize when a reduction in the amount of power occurs in a specific unit solar cell array. For example, when a unit solar cell array that operates normally produces 10 KW of power and a set error value of the generated power amount is set to 1 KW, a ground fault, a short circuit, a short circuit, or a short circuit occurs in a specific unit solar cell array, When generating a power of 6 KW which is a value deviating from the error value, the power amount comparing unit 40 is able to know the unit solar cell array showing a decrease in the amount of power exceeding the set error value.

When the surge protector operation signal and the abnormal power amount signal are generated, the abnormal operation notification unit 50 constituting the server S notifies that the abnormal operation has occurred in the corresponding unit solar cell array.

As described above, according to the intelligent connection half unit for solar photovoltaic power generation according to the present invention, the unit surge protector 32 ', 32' independently connected to the plurality of unit solar cell arrays 10, 10 ', 10 " 31 ', 31 ", 31 ", and unit inverter 20 (20 ") when the unit solar cell arrays 10, 10' Can be prevented from being damaged. Further, by employing the unit surge protector operation signal generating units 33, 33 ', and 33' ', it is possible to detect that a specific unit solar cell array is lightning- .

In addition, by employing the unit breakers 36, 36 ', 36' 'and the blocking data receivers 37, 37', 37 '', the line between the unit solar cell array and the unit connection half The lightning accident can be further prevented.

Further, by employing a plurality of unit power amount signal generators 34, 34 'and 34' 'for detecting the amount of power generated in each of the unit solar cell arrays 10, 10' and 10 '' and generating a power amount signal When a ground fault or a short circuit occurs in a specific unit solar cell array, it can be detected, and maintenance management can be immediately taken, thereby improving power generation efficiency.

In addition, the unit solar cell arrays 10, 10 ', 10 "can be managed remotely, and real-time monitoring and management can be performed.

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 embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

10, 10 ", 10 "... unit solar cell arrays
20, 20 ', 20 "... unit inverter
31, 31 ', 31 "... unit connection unit
32, 32 ', 32 "... unit surge protector
33, 33 ', 33 "... unit surge protector operation signal generating unit
34, 34 ', 34 "... unit power amount signal generating unit
34a ... voltage detecting unit
34b ... electric power detecting unit
34c ... analog / digital conversion section
34d ... digital filter
35, 35 ', 35 "... unit transfer unit
36, 36 ', 36 "... unit breaker
37, 37 ', 37 "... interception data receiver
40 ... power amount comparing unit
50 ... abnormal operation notification unit
S ... server

Claims (5)

A plurality of unit solar cell arrays 10, 10 ', and 10''each comprising a plurality of solar cell modules M as one unit and a plurality of DC power generators for converting DC power output from the unit solar cell arrays into AC power 20 '' and 20 "of the unit inverters 20, 20 '
The solar cell module M is installed between the unit solar cell arrays 10, 10 ', 10 "and the unit inverters 20, 20', 20" Unit connection units 31, 31 'and 31''for merging the power and outputting the combined power to the respective unit inverters 20, 20' and 20 '';
Is connected to each of the unit connection units 31, 31 'and 31''. When a surge occurs in a specific unit solar cell array, the surge is not applied to the unit connection unit, Unit surge protector 32 (32 ') 32 "
The unit surge protector operation signal generating unit, which is connected to each of the unit connection units 31, 31 'and 31'', generates a surge protector operation signal indicating that the unit surge protector is activated when a specific unit surge protector is activated (33) 33 ' (33 ");
A unit transfer part 35 ', 35''connected to each of the unit connection parts 31, 31' and 31 '' for transmitting the respective surge protector operating signals;
Unit breakers 36, 36 ', and 36''installed between the unit solar cell arrays 10, 10', and 10 '' and the unit connection units 31, 31 ', and 31'';
And receives lightning forecast data from the weather station and selectively disconnects or connects the line between the unit solar cell arrays 10, 10 ', 10 "and the unit connection units 31, 31', 31" (37 ') (37'') for controlling the operation of the unit breakers (36), (36') and (36 ''). The method according to claim 1,
Unit power amount signal generating units 34, 34 'and 34''for detecting the amount of power generated in each of the unit solar cell arrays 10, 10' and 10 '' and generating a power amount signal corresponding to the amount of power, Further comprising: a power supply for supplying power to the photovoltaic module. 3. The method of claim 2,
Wherein the unit transmitting units (35), (35 ') and (35'') transmit the respective power amount signals. The method of claim 3,
Communicates with a server (S) installed at a remote location remote from the unit solar cell array (10) (10 ', 10'') and managed in real time by an administrator;
The server (S) compares the plurality of transmitted power signals with each other, and detects a power amount signal when the generated power amount deviates from a set error value range. And an abnormal operation notifying unit (50) for informing that an abnormal operation has occurred in the unit solar cell array when the surge protector operation signal or abnormal power amount signal is generated. delete

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