JP2002044956A - Method for electrical connection for exteded add-on type inverter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify wiring operation for an extension and to enhance appearance of the wiring. SOLUTION: In an add-on type inverter 1000, that comprises a plurality of inverter modules 1 to 4 and disposes the inverter modules 1 to 4 in a row, an electrical connection between each inverter module 1 to 4 is conducted, such that connections are made only between the adjoining inverter modules by the use of wires 63 to 74.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inverter for inputting a DC power supply such as a solar cell or a fuel cell, a DC power obtained by rectifying an AC power generated by wind power generation or a wave power generation, and converting the same into AC power. In particular, the present invention relates to a method for electrically connecting an expandable inverter device.

[0002]

2. Description of the Related Art In recent years, energy conservation and resource conservation have been advocated against the background of the problem of global warming due to an increase in carbon dioxide emission and the problem of depletion of fossil energy, and are referred to as solar power generation, wind power generation, and wave power generation. Attention has been focused on power generation that uses natural energy that has not been used, and power generation that does not emit carbon dioxide by increasing the efficiency of the entire system by using waste heat, such as fuel cell power generation. It is also necessary to develop an inverter device for injecting electric power to the grid and supplying the power to the load without using the grid.

Conventionally, the electrical connection when adding this kind of inverter device has been generally performed as shown in FIGS. The configuration and method are described below with reference to FIGS.
This will be described with reference to FIG.

FIG. 13 is a system block diagram of a photovoltaic power generation system using this type of inverter device.
The photovoltaic power generation system of No. shows a case where an inverter device is not added. In FIG. 13, 101 is 1 k
In the inverter device of W rating, the positive side output (+) and the negative side output (−) of the solar cell 104 are input to the inputs 102 and 103 of the inverter device 101, respectively.
06 and 107 via outputs 108 and 109. Outputs 110 and 111 of the inverter device 101 are
Inputs 113 and 114 and output 1 of integrated power meter 112 for power sale
It is connected to the commercial power supply system 117 via the communication lines 15 and 116. In the connection box 105, in addition to the inputs 106 and 107, 3
System inputs 118, 119 and 120, 121 and 122,
123, and four high-potential side inputs 10
6, 118, 120, and 122 are diodes 1 respectively.
High potential side output 1 via 24, 125, 126, 127
08.

FIG. 14 shows an inverter device 101 and a junction box 105 and an integrated power meter 112 shown in FIG.
And the output 108 of the connection box 105.
And the input 102 of the inverter device 101 is a wire 128,
The output 109 of the junction box 105 and the input 103 of the inverter device 101 are wires 129, and the output 110 of the inverter device 101 and the input 113 of the integrated power meter 112 are wires 1.
At 30, the output 111 of the inverter device 101 and the input 114 of the integrated power meter 112 for power sale are connected by an electric wire 131, respectively.

FIG. 15 is a system block diagram when the 1 kW rated solar power generation system shown in FIG. 13 is expanded to a 4 kW rating. Input 120, 12
1 includes a solar cell 133, an input 122 of the connection box 105,
A solar cell 134 is connected to 123, respectively.
In addition, each of the inverter devices 135 to 1 rated at 1 kW
37 is connected in parallel with the inverter 101.

FIG. 16 shows an electrical connection between the inverter devices 101 and 135 to 137 shown in FIG. 15 and the connection box 105 and the integrated power meter 112 for power sale.
The output 108 of the inverter device 10
1 input 102 and an electric wire 150 to the inverter device 135
138, the input 140 of the inverter device 136 via the electric wire 154, and the input 142 of the inverter device 137 via the electric wire 158. The output 109 of the connection box 105 is connected to the input 103 of the inverter device 101 via the electric wire 129. , Input 1 of the inverter device 135 with the electric wire 151
39 and the input 14 of the inverter device 136 by the electric wire 155.
1 and the input 143 of the inverter device 137 by the electric wire 159.
The input 113 of the power integrating wattmeter 112 is connected to the output 110 of the inverter device 101 by the electric wire 130, the output 144 of the inverter device 135 by the electric wire 152, and the output 1 of the inverter device 136 by the electric wire 156.
46 and the output 14 of the inverter device 137 by the electric wire 160.
8 are connected to each other, and
Are the output 111 of the inverter device 101 on the electric wire 131, the output 145 of the inverter device 135 on the electric wire 153, the output 147 of the inverter device 136 on the electric wire 157, and the output 1 of the inverter device 137 on the electric wire 161.
49, respectively.

When power is generated by irradiating the solar cells 104 and 132 to 134 with sunlight, the inverter 10
1, 135 to 137 are activated and the solar cells 104, 132
Are converted into AC power and output to the commercial power supply system 117.

[0009]

In such a conventional electric connection method for an additional inverter device, the output terminals 108 and 109 of the connection box 105 and the inverter devices 101 and 13 are used.
5 to 137 input terminals 102, 103, 138 to 143
To the wires 128, 129, 150, 151, 15 respectively.
4, 155, 158, and 159, and input terminals 113 and 114 of the integrating power meter 112 for power sale and output terminals 110 and 11 of the inverter devices 101 and 135 to 137.
1, 144 to 149 to electric wires 130, 131, 1
52, 153, 156, 157, 160, 161, the wires 128, 129, 150, 151,
154, 155, 158, 159, 130, 131, 1
52, 153, 156, 157, 160, and 161 are long, and an inverter device with a 1 kW rating shown in FIG. 14 is already installed. There is a problem that the wiring work becomes difficult and a problem that the appearance is deteriorated if the processing after the wiring is not performed well.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide an inverter device that facilitates electrical connection when an existing inverter device is added and can be easily added.

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to an extension type inverter device configured by arranging a plurality of inverter modules side by side, wherein a plurality of inverter modules constituting the extension type inverter device are provided. Is to electrically connect only the inverter modules adjacent to each other to electrically connect the whole of the additional inverter device.

[0012]

The invention according to claim 1 is an extension type inverter device comprising a plurality of inverter modules, wherein the plurality of inverter modules are arranged side by side. The electrical connection of the plurality of inverter modules is to electrically connect only the adjacent inverter modules, thereby performing the electrical connection of the entire additional inverter device. According to the first aspect of the present invention, the inverter device can be added by electrically connecting only the adjacent inverter modules, so that the wiring work for the addition can be simplified, the appearance of the wiring is good, and the addition is easy. it can.

According to a second aspect of the present invention, in the extension type inverter device configured by arranging n (n is an integer of 1 or more) inverter modules side by side, the inverter modules are used for electrical connection. A connection part, and one or more of the one or more potential points in the one connection part, or another connection part different from the one connection part to which all of the potential points are electrically directly connected; The electrical connection between the n inverter modules constituting the inverter device is (k + 1) adjacent to the other connection part of the k-th inverter module (k is an integer of 1 or more and (n-1) or less). The electrical connection is performed by using the one connection portion of the first inverter module to perform the electrical connection of the entire additional inverter device. According to the second aspect of the present invention, since the inverter module has two connection parts, one connection part and the other connection part, the m-th (m is an integer of 2 or more and (n-1) or less) th unit. One connection terminal of the inverter module is electrically connected to another connection terminal of the (m-1) th inverter module,
The other connection terminals of the m-th inverter module are (m +
1) Since the inverter module can be added by electrically connecting to one connection terminal of the first inverter module, wiring work for the addition can be simplified, the appearance of the wiring is good, and the addition can be easily performed.

According to a third aspect of the present invention, there is provided a master inverter module for converting a direct current into an alternating current, and n for increasing the rating.
(N is an integer of 1 or more.) In the additional inverter device configured by arranging the boost modules adjacent to each other, the master inverter module includes:
An external connection portion for electrically connecting to an external device / equipment of the additional inverter device, and an additional connection portion for electrically connecting to the boost module, wherein the boost module has one connection for electrical connection. The master inverter module and the master inverter module constituting the additional type inverter device, each of which has another unit different from the one connection unit to which all the potential points in the one connection unit are electrically directly connected. The electrical connection of the second boost module is performed by electrically connecting the additional connection portion and the one connection portion, and the electrical connection of each of the n boost modules is k (k is 1 or more (n−1)). The following connection is performed by electrically connecting the other connection portion of the boost module of the unit to the one connection unit of the (k + 1) th boost module. According to the third aspect of the present invention, the master inverter module has an additional connection portion, and the boost module has two connection portions, one connection portion and another connection portion. The inverter device can be easily added by electrically connecting one connection portion of the first boost module.
(M is an integer of 2 or more and (n-1) or less.) One connection terminal of the (m-1) th boost module is electrically connected to another connection terminal of the (m-1) th boost module, and the mth boost module is connected. The other connection terminals of the module are electrically connected to the one connection terminal of the (m + 1) th boost module, so that the boost modules can be easily added to each other, so that the wiring work for the addition can be easily performed and the appearance of the wiring can be improved. Good and easy to add.

According to a fourth aspect of the present invention, the electrical connection between the one connection portion and the other connection portion is performed inside the inverter module and the boost module.
According to the invention of claim 4, an inverter module,
And, the electrical direct connection between the one connection part and the other connection part provided in the boost module is electrically connected inside the inverter module and inside the boost module, respectively, so the wiring of this part is outside the inverter module, In addition, it is not visible from outside the boost module, and the appearance of the wiring can be improved.

According to a fifth aspect of the present invention, one connecting portion, another connecting portion, and an additional connecting portion are provided by being divided into a plurality of portions. According to the invention as set forth in claim 5, one connection part, another connection part, and an additional connection part can be provided by being divided into several parts. It can be divided for each type of connection means of the other connection part and the additional connection part, so that the wiring work for the addition can be further simplified and the addition can be facilitated.

According to a sixth aspect of the present invention, one connection portion, another connection portion, and an additional connection portion are provided separately for power and signal. According to the sixth aspect of the present invention, the one connection part, the other connection part, and the additional connection part are provided separately for power and signal, respectively, so that the electrical connection method is divided into two types, one for power and one for signal. The wiring work for the extension can be further simplified, and the extension can be facilitated.

According to a seventh aspect of the present invention, an electric connection between only adjacent inverter modules,
Adjacent to another connection of the inverter module of the unit (k
+1) The electrical connection using one connection part of the first inverter module and the electrical connection between the additional connection part of the master inverter module and the one connection part of the first boost module use electric wires as wiring materials. It is. According to the seventh aspect of the present invention, the electric connection between the adjacent modules uses an electric wire as a wiring material, so that an easy extension can be easily realized.

According to the present invention, the electric connection only between the inverter modules adjacent to each other, and
Adjacent to another connection of the inverter module of the unit (k
+1) The electrical connection using one connection part of the first inverter module and the electrical connection between the additional connection part of the master inverter module and the one connection part of the first boost module use a conductor bar as a wiring material. Things.
According to the eighth aspect of the present invention, the electrical connection between the adjacent modules uses the conductor rod as the wiring member, so that the easy extension can be easily realized.

According to a ninth aspect of the present invention, the inverter module, the master inverter module, and the boost module each include a plug and a plug receiver, and the electrical connection only between the respective adjacent inverter modules. an electrical connection using one connection part of the (k + 1) th inverter module adjacent to another connection part of the kth inverter module, and an additional connection part of the master inverter module and one connection part of the first boost module The electrical connection of the connecting portion is performed by directly joining the plug and the plug receiver without using an external wiring material. According to the ninth aspect of the present invention, the inverter module, the master inverter module, and the boost module include the plug and the plug receiver, and the electrical connection between the adjacent modules is performed without using an external wiring material. Since the plug receiver of the module is directly joined, the wiring work for the extension can be eliminated, and the extension can be easily performed with one touch.

According to a tenth aspect of the present invention, there is provided an electric connection only between the inverter modules adjacent to each other, and
Electrical connection using one connection part of the (k + 1) th inverter module adjacent to the other connection part of the k-th inverter module, and connection between the additional connection part of the master inverter module and the first boost module The electrical connection of one connection portion uses the eyeglass terminal as an electrical joining means. According to the tenth aspect of the present invention, the electrical connection between the adjacent modules uses the eyeglass terminals as the electrical joining means, so that an easy extension can be easily realized.

[0022] The invention according to claim 11 is the electric connection only between the inverter modules adjacent to each other, and
Electrical connection using one connection part of the (k + 1) th inverter module adjacent to the other connection part of the k-th inverter module, and connection between the additional connection part of the master inverter module and the first boost module The electrical connection of one connection portion uses a tab terminal as an electrical joining means. According to the eleventh aspect of the present invention, the electrical connection between the adjacent modules uses the tab terminals as the electrical joining means, so that an easy extension can be easily realized.

According to a twelfth aspect of the present invention, there is provided an electric connection between only adjacent inverter modules, and one connection portion of the (k + 1) th inverter module adjacent to another connection portion of the kth inverter module. And the electrical connection between the additional connection portion of the master inverter module and one connection portion of the first boost module uses a connector as an electrical connection means. According to the twelfth aspect of the present invention, the electrical connection between the adjacent modules uses the connector as the electrical connection means, so that an easy extension can be easily realized.

[0024]

(Embodiment 1) Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.

FIG. 1 shows an extension type system interconnection inverter device 10 which is an extension type inverter device of the first embodiment of the present invention.
FIG. 2 is a system block diagram of a photovoltaic power generation system using an additional system interconnection inverter device 1000.

In FIG. 2, reference numerals 1001 to 1004 denote solar cells, and the solar cells 1001 to 1004 are input to the additional system interconnection inverter 1000 via the connection box 5, respectively. The output is supplied from the commercial power system 100
5 is connected. Structure of connection box 5 and connection box 5
The connection between the solar cell 1001 and the solar cells 1001 to 1004 is the same as the configuration of the connection box 105 shown in the above-described conventional example and the connection between the connection box 105 and the solar cells 104 and 132 to 134, and thus the description thereof is omitted.

In FIG. 1, the additional system interconnection inverter apparatus 1000 includes a 1 kW rated master inverter module 1 as an inverter module and three 1 kW rated boost modules 2 to 4 as inverter modules. The master inverter module 1 is provided with a connection box 5 as an external device, a terminal block 7 as an external connection section for electrically connecting to the integrated power meter 6 for power sale, and a terminal block 8 as an extension connection section. Each of the four terminals 9 to 12 of the terminal block 7 has a printed wiring inside the master inverter module 1 such that the potential points of the four terminals 13 to 16 are the same as those of the four terminals 13 to 16 of the terminal block 8. Electrically connected by 17-20.

Further, the boost module 2 is provided with a terminal block 21 as one connection part and a terminal block 22 as another connection part, and each of the four terminals 23 to 26 of the terminal block 21 has a potential point. Are the four terminals 27 to 30 of the terminal block 22.
Are electrically connected directly to each other by the printed wirings 31 to 34 inside the boost module 2 so as to have the same potential as the above. Similarly, the boost module 3 is provided with a terminal block 35 as one connection section and a terminal block 36 as another connection section.
The terminals 40 to 40 are electrically connected to the four terminals 41 to 44 of the terminal block 36 and the wirings 45 to 48 inside the boost module 3 respectively. Similarly, the boost module 4 is provided with a terminal block 49 as one connection part and a terminal block 50 as another connection part. The four terminals 51 to 54 of the terminal block 49 The terminals 55 to 58 and the inside of the boost module 4 are electrically directly connected by wires 59 to 62, respectively.

A master inverter module 1 and a boost module 2 which are adjacent modules
Is electrically connected to the terminal 13 of the terminal block 8 and the terminal 23 of the terminal block 21 by an electric wire 63 having an eyeglass terminal at an end, and by an electric wire 64 having an eyeglass terminal at an end.
The terminal 14 of the terminal block 8 is electrically connected to the terminal 24 of the terminal block 21, and the terminal 15 of the terminal block 8 is electrically connected to the terminal 25 of the terminal block 21 by an electric wire 65 having an eyeglass terminal at an end. The terminal 16 of the terminal block 8 and the terminal 26 of the terminal block 21 are electrically connected by an electric wire 66 provided with eyeglass terminals. The electrical connection between the boost module 2 and the boost module 3, which are adjacent modules, is performed by electrically connecting the terminal 27 of the terminal block 22 and the terminal 37 of the terminal block 35 with an electric wire 67 having an eyeglass terminal at an end thereof. The terminal 28 of the terminal block 22 is electrically connected to the terminal 38 of the terminal block 35 by an electric wire 68 having an eyeglass terminal at the end, and the terminal 29 of the terminal block 22 is connected to the terminal 29 by an electric wire 69 having an eyeglass terminal at the end. The terminal 3 of the terminal block 22 is electrically connected to the terminal 39 of the base 35 by an electric wire 70 having an eyeglass terminal at an end.
0 and the terminal 40 of the terminal block 35 are electrically connected.

The boost module 3 and the boost module 4, which are adjacent modules, are electrically connected to each other by electrically connecting the terminal 41 of the terminal block 36 and the terminal 51 of the terminal block 49 with an electric wire 71 having an eyeglass terminal at an end. The terminal 42 of the terminal block 36 is electrically connected to the terminal 52 of the terminal block 49 by an electric wire 72 having an eyeglass terminal at an end, and the terminal of the terminal block 36 is connected by an electric wire 73 having an eyeglass terminal at an end. The terminal 43 is electrically connected to the terminal 53 of the terminal block 49, and the terminal 44 of the terminal block 36 is electrically connected to the terminal 54 of the terminal block 49 by an electric wire 74 having an eyeglass terminal at an end. The master inverter module 1 and the connection box 5 are connected by electric wires 75 and 76, and the master inverter module 1 and the integrating power meter 6 for electric power sales are connected by electric wires 77.
And an electric wire 78.

When power is generated by irradiating the solar cells 1001 to 1004 with sunlight, the additional grid-connected inverter 1000 starts up, converts the DC power generated by the solar cells 1001 to 1004 into AC power, and Line 10
Output to 05. At this time, the maximum output power of the additional system interconnection inverter device 1000 is 4 kW.

As described above, according to the electric connection method of the additional system interconnection inverter device 1000 in the first embodiment of the present invention, the four modules 1 to 1 constituting the additional system interconnection inverter device 1000 are provided. In the electrical connection of No. 4, the electrical connection of the entire device is completed by connecting only the adjacent modules with electric wires, so that the expansion can be easily performed, and the expansion installation can be improved.

(Embodiment 2) Hereinafter, a second embodiment of the present invention will be described with reference to FIGS.

FIG. 3 shows an additional system interconnection inverter device 90 which is an additional inverter device according to the second embodiment of the present invention.
FIG. 4 is a system block diagram of a photovoltaic power generation system using an additional system interconnection inverter device 900.

In FIG. 4, reference numerals 901 to 904 denote solar cell strings each of which is a series body of solar cell modules. Each of the solar cell strings 901 to 904 has a different number of solar cell modules in series. The outputs of the battery strings 901 to 904 are directly input to the inverter modules 905 to 908 constituting the additional grid-connected inverter 900, respectively, and the output of the additional grid-connected inverter 900 is the integrated power for power sale. It is connected to the commercial power system 1005 via a total of 6.

Referring to FIG. 3, an extension-type system interconnection inverter device 900 includes inverter modules 905 to 908 arranged side by side, and the inverter module 905 has a terminal block 90 to which a solar cell string 901 is input.
9, a terminal block 910 as one connection section, a terminal block 911 as another connection section, a terminal block 912 as one connection section, and a terminal block 913 as another connection section.
0 and the terminal block 911 are electrically connected directly, and the terminal block 912 and the terminal block 913 are electrically connected directly. The inverter module 906 includes a terminal block 914 to which the solar cell string 902 is input, and a terminal block 915 that is a connection part.
, A terminal block 916 that is another connection section, a terminal block 917 that is one connection section, and a terminal block 918 that is another connection section. The terminal block 915 and the terminal block 916 are electrically directly connected, The terminal blocks 917 and 918 are electrically connected directly.

The inverter module 907 has a terminal block 919 to which the solar cell string 903 is input, a terminal block 920 which is one connection part, and a terminal block 92 which is another connection part.
1, a terminal block 922 which is one connection part, and a terminal block 923 which is another connection part. The terminal block 920 and the terminal block 921 are electrically connected directly, and the terminal block 922 and the terminal block 92 are connected.
3 is electrically connected directly. Inverter module 9
08, a terminal block 924 to which the solar cell string 904 is input, a terminal block 925 as one connection section, a terminal block 926 as another connection section, and a terminal block 927 as one connection section.
And a terminal block 928 which is another connection portion. The terminal block 925 and the terminal block 926 are electrically connected directly, and the terminal block 927 and the terminal block 928 are electrically connected directly.

Inverter modules 905 to 90 necessary for operating the extension type system interconnection inverter device 900
The electric connection between the terminal blocks 911 of the inverter module 905 and the terminal block 920 of the inverter module 907 adjacent to the terminal block 916 of the inverter module 906 and the terminal block 916 of the inverter module 906 are adjacent to each other. , Inverter module 90
Inverter module 90 adjacent to terminal block 921 of No. 7
8 is connected by the electrical connection of the terminal blocks 925 of the inverter module 905, and the electrical connection of the respective outputs of the inverter modules 905 to 908 for the output of the additional system interconnection inverter device 900 is performed by the terminal block 913 of the inverter module 905. Electrical connection of the terminal block 917 of the inverter module 906 adjacent to the inverter module 906, electrical connection of the terminal block 922 of the inverter module 907 adjacent to the terminal block 918 of the inverter module 906, and the inverter module 907.
Inverter module 908 adjacent to terminal block 923
Of the terminal block 927 is electrically connected.

When the solar cell strings 901 to 904 are irradiated with sunlight to generate electric power, the additional system inverter 900 is activated, and the solar cell strings 901 to 904 are activated.
The DC power generated in 904 is converted into AC power and output to the commercial power system 1005.

As described above, according to the method for electrically connecting the additional grid-connected inverter 900 according to the second embodiment of the present invention, the four inverter modules 905 constituting the additional grid-connected inverter 900 are used. The electrical connection of 908 to 908 is performed by electrically connecting the other connection part and the one connection part between the adjacent inverter modules, thereby electrically connecting the entire device. You can do it.

Further, by arranging one connecting portion and the other connecting portion separately, the degree of freedom in structural design is increased.

As shown in FIGS. 5 and 6, the solar cell strings 901 to 904 and the inverter module 90
5 to 908, after connecting the four inputs of the solar cell strings 901 to 904 to the terminal block 929 of the inverter module 905,
0 and the terminal block 931 and the terminal block 932 and the terminal block 93
3 and the connection between the terminal block 934 and the terminal block 935.

(Embodiment 3) Hereinafter, a third embodiment of the present invention will be described with reference to FIG.

In FIG. 7, reference numeral 2000 denotes a third embodiment of the present invention.
FIG. 3 is an external perspective view of an extension-type grid-connected inverter device that is the extension-type inverter device according to the first embodiment. The extension-type grid-connected inverter device 2000 includes the modules 1 to 4 described in the first embodiment of the present invention. Each is constituted by the same module, and the difference from the first embodiment of the present invention is that
As a wiring material for electrical connection between adjacent modules, instead of electric wires 63 to 74 each having an eyeglass terminal at an end, a copper bus bar 163 that is a conductor bar is used.
174 are used, and the operation of the additional system interconnection inverter device 2000 is the same as that of the additional system interconnection inverter device 1000 according to the first embodiment of the present invention, and therefore the description is omitted.

As described above, according to the electric connection method of the additional system interconnection inverter device 2000 in the third embodiment of the present invention, the four modules 1 to 1 constituting the additional system interconnection inverter device 2000 are provided. In the electrical connection of 4, the electrical connection of the entire apparatus is completed by connecting only the adjacent modules with the copper busbars 163 to 174, which are conductor rods. It can be improved. In addition, bus bar 163-1
74 has strong structural strength and can improve reliability.

(Embodiment 4) Hereinafter, a fourth embodiment of the present invention will be described with reference to FIGS.

In FIG. 8, reference numeral 3000 denotes a fourth embodiment of the present invention.
FIG. 14 is an external perspective view of an additional system interconnection inverter device that is an additional inverter device according to the fourth embodiment. The additional system interconnection inverter device 3000 according to the fourth embodiment includes inverter modules 3001 to 3004. The inverter module 3001 is the master inverter module 1 that constitutes the extension type system interconnection inverter device 1000 of the first embodiment, and the configuration of the extension connection unit is the terminal block 8.
And a plug receiver 3005 to 3008 provided instead of the inverter module 3002.
Is the additional system interconnection inverter device 1 of the first embodiment.
000, the plug 300 is replaced by a plug 300 instead of using the terminal block 21.
9 to 3012 are provided, and instead of using the terminal block 22, the structure of the other connecting portions is changed to plug receivers 3013 to 3016.
And the inverter module 30
Reference numeral 03 denotes a boost module 3 included in the additional system interconnection inverter device 1000 of the first embodiment.
Instead of using the terminal block 35, the plug 3
017 to 3020 are provided, and instead of using the terminal block 36, the other connection portions are replaced with plug receivers 3021 to 3020.
24, and the inverter module 3004 is different from the boost module 4 that constitutes the additional system interconnection inverter device 1000 of the first embodiment in that one connecting portion is replaced with the terminal block 49 instead of using the terminal block 49. In this configuration, plugs 3025 to 3028 are provided.

Although not shown, the terminal 9 of the inverter module 3001, the plug receiver 3005, and the terminal 1
0 and plug receiver 3006, terminal 11 and plug receiver 300
7, the terminal 12 and the plug receiver 3008 are electrically connected directly to each other, and the plug 3009 and the plug receiver 3013, the plug 3010 and the plug receiver 3014, and the plug 3011 and the plug receiver 30 of the inverter module 3002 are electrically connected.
15, the plug 3012 and the plug receiver 3016 are electrically connected directly to each other.
03 plug 3017, plug receiver 3021 and plug 3
018 and plug receiver 3022, plug 3019 and plug receiver 3023, plug 3020 and plug receiver 3024
Are electrically connected directly.

FIG. 9 shows the plug receiver 3005 and the plug 30.
FIG. 9 is a cross-sectional view showing a configuration of the embodiment 09.

In FIG. 9, first, a plug receiver 3005
In the following description, 3034 is a case of an inverter module 3001 and a bushing material 3029 made of rubber.
Is provided through a part of the case 3034, and two copper plates 3030 and 3
031 is press-fitted, and the copper plate 3030 and the copper plate 3031
Are arranged so that their planes are opposed to each other with a slight gap. One end of the copper plate 3030 and one end of the copper plate 3031 are electrically connected to the terminal 9 by a screw 3032.
033, and the plug receiver 3005 is configured as described above. Other plug receiver 3
006 to 3008, 3013 to 3016, 2021 to 3
The configuration of No. 024 is the same as that of the plug receiver 3005, and the description is omitted.

Next, the structure of the plug 3009 will be described. Reference numeral 3035 denotes a case of the inverter module 3002, and a bushing material 3036 made of rubber is used for the case 3035.
Of the bushing material 303.
6, a copper plate 3037 is press-fitted.
Is fastened together with an electric wire 3040 for electrically connecting directly to the plug receiver 3013 by a screw 3038 and a nut 3039, and the plug 3009 is constituted as described above. Other plugs 3010 to 3012, 301
7 to 3020 and 2025 to 3028 are also plug 3
This is the same as 009, and the description is omitted.

Referring to FIG. 8 again, the electrical connection between the inverter module 3001 and the adjacent inverter module 3002 is made by inserting the plugs 3009 to 3012 of the inverter module 3002 into the plug receivers 3005 to 3008 of the inverter module 3001. 9 will be described in more detail with reference to FIG.
005, two copper plates 3030 and 303
By being inserted into one gap, it is electrically connected. The electrical connection between the inverter module 3002 and the adjacent inverter module 3003 is determined by the plug receptacles 3013 to 3016 of the inverter module 3002.
The plugs 3017-3 of the inverter module 3003
020 is electrically connected by inserting
The electrical connection between the inverter module 3003 and the adjacent inverter module 3004 is made by inserting the plugs 3025 to 3028 of the inverter module 3004 into the plug receivers 3021 to 3024 of the inverter module 3003.

As described above, according to the electrical connection method of the additional system interconnection inverter 3000 in the fourth embodiment of the present invention, the four modules 3001 to 3003 constituting the additional system interconnection inverter 3000 are provided. The electrical connection of 3004 is such that the plug receiver and the plug of the adjacent module are directly joined without using an external wiring material, so that the extension can be performed very easily, and the installability of the extension can be greatly improved. is there. Further, since it is not necessary to use an external wiring material, the cost can be reduced and the appearance is good.

(Embodiment 5) Hereinafter, a fifth embodiment of the present invention will be described with reference to FIG.

In FIG. 10, reference numeral 4000 denotes an external perspective view of an additional grid-connected inverter, which is an additional inverter according to the fifth embodiment of the present invention. 4
001 to 4004. The inverter module 4001 is different from the master inverter module 1 of the additional system interconnection inverter device 1000 of the first embodiment in that a tab terminal block 4005 is provided instead of using the terminal block 8 in the configuration of the additional connection unit. An inverter module 4002 is different from the boost module 2 of the additional system interconnection inverter device 1000 of the first embodiment in that a tab terminal block 4006 is provided instead of using the terminal block 21 for one connection. This is a configuration in which a tab terminal block 4007 is provided instead of using the terminal block 22 in the configuration of the other connection section.

Further, the inverter module 4003
The additional system interconnection inverter device 100 of the first embodiment.
In the boost module 3 of FIG. 0, the configuration of one connection portion is changed to the tab terminal block 400 instead of using the terminal block 35.
8 is provided, and the other connecting portion is provided with a tab terminal block 4009 instead of using the terminal block 36. The inverter module 4004 is an extension type system interconnection inverter of the first embodiment. In the boost module 4 of the device 1000, one connecting portion is provided with a tab terminal block 4010 instead of using the terminal block 49, and the other connecting portion is provided with a tab terminal block 4011 instead of using the terminal block 50. Is provided, and
Instead of using the electric wire 63 having the eyeglass terminals at both ends of the first embodiment, the electric connection is made by using the electric wire 4012 having the tab receptacle with the resin cover provided at both ends, and the same electric connection method is performed below. .

As described above, according to the electrical connection method of the additional system interconnection inverter 4000 according to the fifth embodiment of the present invention, the four modules 4001 to 4004 constituting the additional system interconnection inverter 4000 are provided. In the electrical connection of 4004, only the modules adjacent to each other are connected using electric wires joined by tab terminals, so that the entire device is electrically connected. Therefore, expansion can be easily performed and expansion installation can be improved. Things.

(Embodiment 6) Hereinafter, a sixth embodiment of the present invention will be described with reference to FIG.

In FIG. 11, reference numeral 5000 denotes an external perspective view of an extension-type system interconnection inverter device which is an extension-type inverter device according to the fifth embodiment of the present invention. 5
001 to 5004. The inverter module 5001 has a configuration in which a connector 4013 is provided instead of using the terminal block 8 in the configuration of the additional connection part in the master inverter module 1 configuring the additional system interconnection inverter device 1000 of the first embodiment. The inverter module 5002 has a configuration in which a connector 4014 is provided instead of using the terminal block 21 in the configuration of one connection part in the boost module 2 configuring the additional system interconnection inverter apparatus 1000 of the first embodiment. The configuration of the other connection section is such that a connector 4015 is provided instead of using the terminal block 22.

The inverter module 5003 is
The additional system interconnection inverter device 100 of the first embodiment.
0 in the boost module 3, the connector 4016 is replaced by a connector 4016 instead of using the terminal block 35.
And a connector 4017 is provided instead of using the terminal block 36 for the other connection part. The inverter module 5004 is the same as the extension type system interconnection inverter device 1000 of the first embodiment. In the boost module 4 to be configured, one of the connecting portions is configured to have a connector 4018 instead of using the terminal block 49, and the other connecting portion is configured to have a connector 4019 instead of using the terminal block 50. In addition, instead of using the electric wire 63 provided with the spectacle terminals at both ends in the first embodiment, the electric connection is made by using the electric wire 4020 provided with the connector at both ends, and the same electric connection method is performed hereinafter. .

As described above, according to the electrical connection method of the extension type system interconnection inverter device 5000 of the sixth embodiment of the present invention, the four modules 5001 to 500 The electric connection of 5004 is such that the electric connection of the entire apparatus is performed by connecting only adjacent modules using electric wires joined by a connector, so that the expansion can be easily performed, and the expansion installation can be improved. It is.

Further, as shown in FIG. 12, another connection portion of the inverter module 5001 is connected to the power connector 40.
13 and a signal 4023, and one connection part of the inverter module 5002 may be divided into a power connector 4014 and a signal connector 4024.

[0063]

As described above, according to the first aspect of the present invention, it is possible to increase the number of inverter devices by electrically connecting only adjacent inverter modules, so that the wiring work for the addition can be simplified. The appearance of the wiring is good, and expansion can be easily performed.

According to the second aspect of the present invention, since the inverter module has two connection parts, one connection part and another connection part, m (m is an integer of 2 or more and (n-1) or less) )) One connection terminal of the first inverter module is
The (m-1) th inverter module is electrically connected to another connection terminal, and the mth inverter module is connected to another connection terminal of the (m + 1) th inverter module. Can be added, wiring work for the addition can be simplified, the appearance of the wiring is good, and the addition can be easily performed.

According to the third aspect of the present invention, the master inverter module has an additional connection portion, and the boost module has two connection portions, one connection portion and the other connection portion. By electrically connecting the extension terminal section and one connection section of the first boost module, the inverter device can be easily added, and
One connection terminal of the m-th (m is an integer of 2 or more and (n-1) or less) boost module is electrically connected to another connection terminal of the (m-1) -th boost module, and the m-th boost module is connected. The other connection terminals of the boost module are electrically connected to one connection terminal of the (m + 1) -th boost module, so that the boost modules can be easily added to each other. Also, it can be easily expanded.

According to the fourth aspect of the present invention, the electrical connection between the one connection portion and the other connection portion provided in the inverter module and the boost module is performed inside the inverter module and inside the boost module, respectively. , The wiring in this portion is not visible from the outside of the inverter module and the outside of the boost module, respectively, so that the appearance of the wiring can be improved.

According to the fifth aspect of the present invention, the one connecting part, the other connecting part, and the additional connecting part can be divided into several parts, respectively. For example, it is possible to divide the connection means for each type of connection means of one connection part, another connection part, and an additional connection part, so that the wiring work for the addition can be further simplified and the addition can be facilitated.

According to the sixth aspect of the present invention, the one connection part, the other connection part, and the additional connection part are provided separately for power and signal, respectively. It can be divided into two types, wiring work for extension can be further simplified, and extension can be facilitated.

Further, according to the present invention, since the electric connection between the adjacent modules uses an electric wire as a wiring material, an easy extension can be easily realized.

According to the eighth aspect of the present invention, since electrical connection between adjacent modules uses conductor rods as wiring members, easy extension can be easily realized.

According to the ninth aspect of the present invention, the inverter module, the master inverter module, and the boost module have the plug and the plug receiver, and the electric connection between the adjacent modules can be performed without using an external wiring material. Since the plug and the plug receiver of the adjacent module are directly joined, wiring work for the extension can be eliminated, and the extension can be easily performed with one touch.

According to the tenth aspect of the present invention, the electrical connection between the adjacent modules uses the eyeglass terminals as the electrical joining means, so that an easy extension can be easily realized.

According to the eleventh aspect of the present invention, since the tabs are used as the electric connection means for the electric connection between the adjacent modules, an easy extension can be easily realized.

According to the twelfth aspect of the present invention, the electrical connection between the adjacent modules uses the connector as the electrical connection means, so that the easy extension can be easily realized.

[Brief description of the drawings]

FIG. 1 is an external perspective view of an extension type inverter device according to a first embodiment of the present invention.

FIG. 2 is a system block diagram of a photovoltaic power generation system using the additional inverter device according to the first embodiment of the present invention.

FIG. 3 is an external perspective view of an additional inverter device according to a second embodiment of the present invention.

FIG. 4 is a system block diagram of a photovoltaic power generation system using an additional inverter device according to a second embodiment of the present invention.

FIG. 5 is an external perspective view of an additional inverter device according to a second embodiment of the present invention.

FIG. 6 is a system block diagram of a photovoltaic power generation system using an additional inverter device according to a second embodiment of the present invention.

FIG. 7 is an external perspective view of an additional inverter device according to a third embodiment of the present invention.

FIG. 8 is an external perspective view of an extension inverter device according to a fourth embodiment of the present invention.

FIG. 9 is a sectional view of a plug receiver and a plug of an extension inverter device according to a fourth embodiment of the present invention.

FIG. 10 is an external perspective view of an additional inverter device according to a fifth embodiment of the present invention.

FIG. 11 is an external perspective view of an additional inverter device according to a sixth embodiment of the present invention.

FIG. 12 is an external perspective view of an extension inverter device according to a sixth embodiment of the present invention.

FIG. 13 is a system block diagram of a photovoltaic power generation system using a conventional additional inverter device.

FIG. 14 is an external perspective view of a conventional additional inverter device.

FIG. 15 is a system block diagram of a photovoltaic power generation system using a conventional additional inverter device.

FIG. 16 is an external perspective view of a conventional additional inverter device.

[Explanation of symbols]

1: Master inverter module (inverter module) 2, 3, 4 ... Boost module (inverter module) 900, 1000, 2000, 3000, 4000, 5
000: Additional inverter device 7, 8, Terminal block (external connection) 21, 35, 49 Terminal block (one connection) 22, 36, 50 Terminal block (one connection) 63-74: Electric wire 905 908 ... Inverter modules 910, 912, 915, 917, 920, 922, 9
25, 927, 929, 931, 933, 935 Terminal block (one connection part) 911, 913, 916, 918, 921, 923, 9
26, 928, 930, 932, 934, 936: Terminal block (other connection portion) 163-174: Bus bar (conductor bar) 3001-3004: Inverter module 3009-3012, 3017-3019, 3020
3025 to 3028 ... plugs 3005 to 3008, 3013 to 3016, 3021
3024: Plug receiver 4001 to 4004: Inverter module 4005: Tab terminal block (additional connection section) 4006, 4008, 4010: Tab terminal block (one connection section) 4007, 4009, 4011: Tab terminal block (other connection section) 4012 Wires 5001 to 5004 Inverter module 4013 Connector (additional connection) 4014, 4016, 4018 Connector (one connection) 4015, 4017, 4019 Connector (other connection) 4020 to 4022 Electric wire 4023 Connector (additional connection) Parts) 4024, 4026, 4028 ... connectors (one connection part) 4025, 4027, 4029 ... connectors (other connection parts) 4030 to 4032 ... electric wires

Continued on the front page (72) Inventor Masafumi Sadahira 1006 Kadoma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. Person Hideki Omori 1006 Kazuma Kadoma, Kadoma-shi, Osaka Matsushita Electric Industrial Co., Ltd. F term (reference) 5H007 CC05 HA04 5H420 CC03 DD03 EA48 EB39 KK06

Claims (12)

[Claims] In an extension type inverter device configured by arranging a plurality of inverter modules side by side, an electric connection of a plurality of inverter modules constituting the extension type inverter device is electrically connected only between adjacent inverter modules. The electric connection method of the additional inverter device is performed by performing the electric connection of the whole additional inverter device. 2. An additional inverter device comprising n (n is an integer of 1 or more) inverter modules arranged side by side, wherein the inverter module includes one connection portion for electrical connection and the one connection portion. One or more of the one or more potential points in the connection part, or the whole, has another connection part different from the one connection part that is electrically directly connected, and constitutes the additional inverter device. The electrical connection of the n inverter modules is based on the k (where k is an integer not less than 1 and not more than (n-1)) the other connection portion of the nth inverter module,
An electrical connection method for an extension-type inverter device, wherein electrical connection is made to the entire extension-type inverter device by using the one connection portion of an adjacent (k + 1) -th inverter module. 3. An additional inverter device comprising a master inverter module for converting a direct current into an alternating current and n (n is an integer of 1 or more) boost modules for increasing the rating, which are arranged adjacent to each other. The master inverter module includes an external connection unit for electrically connecting to an external device / equipment or the like of the additional inverter device, and an additional connection unit for electrically connecting to the boost module. One connection part for connection and another connection part different from the one connection part to which all potential points in the one connection part are electrically directly connected, and the additional type inverter device is constituted. The electrical connection between the master inverter module and the first boost module is made by electrically connecting the additional connection section and the one connection section. , The electrical connection of each of the n boost modules is k (k is 1 or more (n-1)
Integer below. A) an electrical connection method for an additional inverter device in which the other connection part of the boost module of the first type is electrically connected to the connection part of the adjacent (k + 1) th boost module. 4. An electrical direct connection between one connection part and another connection part,
The method for electrically connecting an additional inverter device according to claim 2 or 3, wherein the method is performed inside the inverter module and the boost module. 5. The method according to claim 2, wherein the one connection part, the other connection part, and the additional connection part are provided by being divided into a plurality of parts. 6. The connection part, the other connection part, and the additional connection part are provided separately for power and for signal, respectively.
5. The electrical connection method for an extension type inverter device according to any one of items 4 to 4. 7. An electrical connection only between adjacent inverter modules, and an electrical connection using one connection portion of the (k + 1) th inverter module adjacent to the other connection portion of the k-th inverter module. The electrical connection between the additional connection part of the master inverter module and one connection part of the first boost module uses an electric wire as a wiring material. Electric connection method. 8. An electrical connection only between adjacent inverter modules, and an electrical connection using one connection portion of the (k + 1) th inverter module adjacent to the other connection portion of the k-th inverter module. The additional inverter device according to any one of claims 1 to 6, wherein an electrical connection between the additional connection portion of the master inverter module and one connection portion of the first boost module uses a conductor bar as a wiring material. Electrical connection method. 9. The inverter module, the master inverter module, and the boost module each include a plug and a plug receiver, and electrical connection only between the adjacent inverter modules, and the k-th inverter module. Electrical connection using one connection part of the (k + 1) th inverter module adjacent to the other connection part, and electrical connection between the additional connection part of the master inverter module and one connection part of the first boost module The electrical connection method for an additional inverter device according to any one of claims 1 to 6, wherein the plug and the plug receiver are directly joined without using an external wiring material. 10. An electrical connection only between adjacent inverter modules, and an electrical connection using one connection portion of the (k + 1) th inverter module adjacent to the other connection portion of the k-th inverter module. The additional inverter according to any one of claims 1 to 6, wherein an electrical connection between the additional connection portion of the master inverter module and one connection portion of the first boost module uses eyeglass terminals as an electrical joining means. The method of electrical connection of the device. 11. An electrical connection only between adjacent inverter modules, and an electrical connection using one connection portion of the (k + 1) th inverter module adjacent to the other connection portion of the k-th inverter module. The additional inverter according to any one of claims 1 to 6, wherein an electric connection between the additional connection part of the master inverter module and one connection part of the first boost module uses tab terminals as electric joining means. The method of electrical connection of the device. 12. An electrical connection between only adjacent inverter modules and an electrical connection using one connection portion of the (k + 1) th inverter module adjacent to the other connection portion of the k-th inverter module. The additional inverter device according to any one of claims 1 to 6, wherein an electrical connection between the additional connection portion of the master inverter module and one connection portion of the first boost module uses a connector as an electrical connection means. Electrical connection method.