CN202550291U - Contactor module and photovoltaic grid connection inversion device - Google Patents

Abstract

The utility model provides a contactor module which comprises a fixing plate and contactors arranged on the fixing plate, wherein the a plurality of groups contactors are adopted, and the number of the groups of the contactors is an integral multiple of three, and the plurality of groups of contactors are mounted in parallel on the fixing plate; and in each group of contactors, a wire incoming end of a single contactor is led out through a wire incoming copper bar to form a wire incoming terminal, and a wire outgoing end of the contactor is led out through a wire outgoing copper bar to form a wire outgoing terminal. Accordingly, the utility model provides a photovoltaic grid connection inversion device. By using the contactor module, the flow equalization of each branch can be effectively improved, and at the same time the cost is relatively low.

Description

A contactor module and photovoltaic grid-connected inverter device

technical field

The utility model belongs to the technical field of photovoltaic power generation, and in particular relates to a contactor module and a photovoltaic grid-connected inverter device using the contactor module.

Background technique

Solar energy is widely used in various fields of social life, especially in photovoltaic grid-connected power station systems, due to its advantages of safety and reliability, no noise, no pollution, no geographical constraints, low failure rate, and easy maintenance.

High-power photovoltaic grid-connected inverter is the core equipment of photovoltaic power station. It includes grid-connected inverters, AC contactors and other devices. In the photovoltaic grid-connected inverter device, the input end of the grid-connected inverter is connected to the output end of the photovoltaic array, and the direct current generated in the photovoltaic array is converted into a grid-connected inverter or further through a step-up transformer to meet the requirements of the grid. The AC power is directly connected to the grid through the AC contactor connected to the output end of the grid-connected inverter.

At present, in photovoltaic grid-connected inverter devices, the AC contactor for outputting AC power generally adopts an AC contactor with three-way contact switches, that is, the AC contactor has three input terminals and three output terminals respectively. The wiring of the incoming and outgoing terminals of the AC contactor using the above structure is relatively simple, and there is no need to combine the incoming or outgoing terminals in advance; however, the AC contactor also has the disadvantage of poor current sharing characteristics of each branch. The disadvantage is that the inverter device in a certain branch may be damaged due to excessive current, and the weight of the AC contactor is relatively heavy, which makes its installation and subsequent maintenance difficult; in addition, due to the high-power grid-connected inverter system The requirements for the withstand voltage of the contactor and the overcurrent level of each branch are relatively high, so the selection of the contactor and the procurement of other matching components are relatively difficult and costly. As a result, the volume and weight of the high-power photovoltaic grid-connected inverter are relatively large, which makes it difficult to carry and install the inverter and build the inverter machine room. Therefore, how to minimize the grid-connected inverter The size and weight of the device, while reducing the cost of the inverter device has become an urgent problem to be solved.

Utility model content

The technical problem to be solved by the utility model is to provide a contactor module and a photovoltaic grid-connected inverter device for the above-mentioned deficiencies in the prior art. , and the cost is lower.

The technical solution adopted to solve the technical problem of the utility model is that the contactor module includes a fixed plate and a contactor arranged on the fixed plate, wherein the contactor adopts multiple groups, and the number of groups of contactors is three Integer multiples, the multiple groups of contactors are installed side by side on the fixed plate. In each group of contactors, the incoming wire end of the single contactor is drawn out through the incoming wire copper bar to form an incoming wire terminal, and its outgoing wire end is drawn out through the outgoing wire copper bar. Form the outgoing terminal.

Preferably, in each group of contactors, a single contactor includes multiple incoming wire ends and multiple outgoing wire ends, and each of the multiple incoming wire ends is led out through an incoming wire copper bar to form multiple incoming wire terminals; The plurality of outlet terminals are led out in parallel through an outlet copper bar to form a common outlet terminal, that is, each of the plurality of inlet terminals is connected to an inlet copper bar, and the plurality of outlet terminals are respectively connected to the same outlet terminal. The copper bars are connected together. Through this connection mode, the current sharing characteristics of each branch of the circuit can be effectively improved.

Further preferably, each group of contactors includes a contactor, the contactor includes three incoming wire ends and three outgoing wire ends, and the shape of the incoming copper bar connected to each incoming wire end is The shape of the outgoing copper bar is a "mountain" shape, and one end of the "mountain"-shaped outgoing copper bar includes three branches, and the three branches are respectively connected to the three outgoing terminals of the contactor . In this way, the three outlet ends of the contactor in the group of contactors can be connected in parallel through a "mountain"-shaped outlet copper bar, and each "mountain"-shaped outlet copper bar constitutes the contactor module. One outgoing terminal.

Alternatively, each group of contactors includes two or more contactors, wherein each contactor includes three incoming wire ends and three outgoing wire ends, and the incoming wire copper connected to each incoming wire end The shape of the row is a strip, and the shape of the outgoing copper bar is a rake shape. One end of the rake-shaped outgoing copper bar includes a plurality of branches, and the plurality of branches are connected to two or more contactors in each group of contactors. The outlets in each terminal are connected separately. In this way, all outlet ends of two or more contactors in the group of contactors can be connected in parallel through rake-shaped outlet copper bars, and each rake-shaped outlet copper bar constitutes an outlet terminal of the contactor module. Since the connecting copper bars in the contactor module can be fully exposed from the contactor, the connection with other devices can be facilitated.

Preferably, the outlet copper bar is provided with a flow equalization hole, and the flow equalization hole on the outlet copper bar is set at a position corresponding to the branch in the middle of the "mountain"-shaped or rake-shaped outlet copper bar, which The shape is strip-shaped, and its length direction is the same as the arrangement direction of the branches.

Preferably, the contactor module further includes a supporting plate, the contactors are fixed on the supporting plate, and the supporting plate is arranged on the fixing plate. Arranging a support plate between the contactor and the fixing plate can increase the safety distance between the connecting copper bars (incoming copper bars or outgoing line copper bars) on each contactor and the fixing plate, thereby improving the safety of the contactor module.

Preferably, the support plate is square, and the length of the support plate is greater than or equal to the total width of the plurality of contactors, and the plurality of contactors are respectively fixed on the support plate by bolts or screws.

Further preferably, the support plate is made of aluminum-zinc clad plate, and the thickness of the support plate is greater than or equal to 2.5 mm.

Preferably, the fixing plate is made of aluminum-zinc clad plate, and the thickness of the fixing plate is greater than or equal to 2.5mm.

A photovoltaic grid-connected inverter device includes a contactor module, and the contactor module adopts the above-mentioned contactor module.

Preferably, the device further includes a cabinet, and the contactor module is installed on an inner wall of the cabinet.

The utility model can obtain a contactor module satisfying higher overcurrent requirements by adopting a plurality of lower-cost contactors connected in parallel. The contactor module has lower cost and better circuit current equalization.

The beneficial effects of the utility model contactor module are as follows:

1. Since the contactor module is formed by parallel connection of multiple independent contactors, and the incoming and outgoing terminals of the contactor module are led out by fully exposed incoming and outgoing copper bars, the connection method is simple and easy, and It is convenient for the handling, installation and post-maintenance of the contactor module, and it is also convenient for the connection between the contactor module and other devices;

2. Since the contactor module is formed by connecting multiple independent contactors in parallel, the requirements for the electrical parameters (mainly overcurrent parameters) of the independent contactors are not high, making the contactor module lower in cost and smaller in capacity The independent contactor can meet the requirements of higher overcurrent, so that the cost of the contactor module is greatly reduced;

3. The incoming and outgoing wires of each contactor in the contactor module are led out by incoming and outgoing copper bars, which effectively improves the current sharing characteristics of each branch;

4. After using the contactor module, it is necessary to achieve the same electrical parameters in the high-power photovoltaic grid-connected inverter device. The contactor module used can be formed by parallel connection of multiple independent contactors. The volume (half of the original contactor) and weight (such as 5kg) of the new contactor can be greatly reduced compared with the volume and weight of the existing contactor (such as 20kg).

Description of drawings

Fig. 1 is a schematic structural diagram of a contactor module in Embodiment 1 of the utility model;

Fig. 2 is a three-dimensional structural diagram of the contactor module in Fig. 1;

Fig. 3 is a schematic structural diagram of the contactor module in Embodiment 2 of the present invention.

In the figure: 1-first contactor; 2-second contactor; 3-third contactor; 4-support plate; 5-fixing plate; 6-incoming line end; 7-incoming line port; Copper bar; 9-outlet end; 10-outlet port; 11-outlet copper bar; 12-flow equalizing hole.

Detailed ways

In order to enable those skilled in the art to better understand the technical solution of the utility model, the contactor module and the photovoltaic grid-connected inverter device of the utility model will be further described in detail below in conjunction with the drawings and specific embodiments.

A contactor module, comprising a fixed plate and contactors arranged on the fixed plate, the contactors adopt multiple groups, the number of groups of the contactors is an integer multiple of three, and the multiple groups of contactors are installed side by side On the fixed plate, in each group of contactors, the incoming wire end of the single contactor is drawn out through the incoming wire copper bar to form an incoming wire terminal, and its outgoing wire end is drawn out through the outgoing wire copper bar to form an outgoing wire terminal.

Example 1:

As shown in FIGS. 1 and 2 , in this embodiment, the contactor module includes a fixing plate 5 , a supporting plate 4 and a contactor.

In this embodiment, three groups of contactors are used. Each group of contactors includes one contactor, that is, there are three contactors in this embodiment, namely the first contactor 1, the second contactor 2 and the third contactor 3, and the three contactors are connected in parallel way to connect. The models of the three contactors are the same, and they all adopt AC contactors with three-way contact switches, that is, the AC contactors have three incoming wire terminals and three outgoing wire terminals, and each contactor has three incoming wire terminals. 6 and three outlet terminals 9.

The three incoming wire terminals 6 in each contactor are led out through three incoming wire copper bars 8 to form three incoming wire terminals, and the three outgoing wire ends 9 are drawn out in parallel through one outgoing wire copper bar 11 to form a Common outgoing terminal.

In this embodiment, the shape of a single incoming copper bar 8 connected to each incoming line terminal 6 is strip-shaped, and the incoming line copper bar 8 is provided with an incoming line port 7, through which the incoming line port 7 can be connected with the output terminal of the inverter. In Figures 1 and 2, cable wiring holes, insulating column mounting holes, and data acquisition holes are provided on the incoming copper bar 8 from top to bottom (according to the order of arrangement in the figure) to facilitate wiring and current/voltage data measurement.

In this embodiment, the shape of the outgoing copper bar 11 is a "mountain" shape, and one end of the "mountain" shaped outgoing copper bar includes three branches, and the three branches are respectively connected to the three branches of a single contactor. The outlet terminal 9 is connected. In this way, the three outlet terminals 9 in a single contactor can be connected in parallel through a "mountain"-shaped outlet copper bar, and each "mountain"-shaped outlet copper bar constitutes an outlet terminal of the contactor module, thereby Make three contactors form three outlet terminals. That is, the three outgoing terminals of the first contactor 1 are connected with a "mountain"-shaped copper bar to form the first outgoing terminal of the contactor module, and the three outgoing terminals of the second contactor 2 are connected with a "mountain"-shaped copper bar Connect to form the second outgoing terminal of the contactor module. The three outgoing terminals of the third contactor 3 are connected with a "mountain"-shaped copper bar to form the third outgoing terminal of the contactor module. The three outgoing terminals serve as The AC output end of the contactor module is connected to the circuit breaker and then connected to the power grid. Wherein, the outgoing copper bar 11 is also provided with elongated flow equalizing holes 12 to disperse the flow direction of the current. Specifically, the flow equalizing hole 12 on the outlet copper bar 11 is set at the position corresponding to the three branches in the middle of the "mountain" shaped outlet copper bar, and the length direction of the flow equalizing hole 12 is in line with the three branches. The arrangement direction is the same.

It can be seen from the basic knowledge of the circuit that when the current flowing into the circuit is constant, when there are fewer incoming terminals of the contactor, the current distributed to each branch will be correspondingly larger, resulting in a larger current between each branch. The difference; while the more incoming terminals of the parallel contactor, the smaller the current distributed to each branch, making the difference between the currents of each branch relatively small, so in comparison, the contactor's incoming The more wire ends, the better the current sharing effect of each branch. In addition, there are flow equalizing holes 12 on the outgoing copper bar 11 , therefore, the connection mode of the incoming copper bar and the outgoing copper bar in the contactor module in this embodiment effectively improves the current equalizing characteristics of each branch. Moreover, in the above-mentioned connection mode, the connecting copper bars (including incoming copper bars and outgoing copper bars) in the contactor module can be fully exposed, so as to facilitate the installation of the contactor module and the inverse connection between the contactor module and the photovoltaic grid. Connections to other devices in the transformer.

The three contactors are installed side by side on the support plate 4 . Wherein, the support plate 4 is square, the length of the support plate 4 is greater than or equal to the total width of the above three contactors, the height of the support plate 4 is greater than or equal to the height of a single contactor, the support plate 4 and the The backs of the contactors are bolted or screwed together. Wherein, in order to ensure the support strength, the support plate 4 is made of aluminum-zinc clad plate, and the thickness of the support plate is greater than or equal to 2.5mm. The supporting plate 4 is arranged on the fixing plate 5 .

In the above-mentioned installation method, since the incoming and outgoing terminals of the contactor module are still arranged on the front of the contactor compared to a single contactor, when the contactor module is installed After being placed in the cabinet of the device, the incoming and outgoing terminals can be fully exposed, so as to facilitate the installation of the contactor module and the connection with other devices in the photovoltaic grid-connected inverter device.

A photovoltaic grid-connected inverter device using the contactor module in this embodiment includes a cabinet body, and the contactor module is installed on the inner wall of the cabinet of the photovoltaic grid-connected inverter device through a fixing plate 5 . The height and length of the fixing plate 5 are respectively greater than the height and length of the supporting plate 4, the supporting plate 4 and the fixing plate 5 are fixedly connected together by bolts or screws, and the fixing plate 5 is fixed on the cabinet of the inverter device by bolts or screws on the inner wall. Wherein, the fixing plate 5 is made of an aluminum-zinc clad plate, and the thickness of the fixing plate 5 is greater than or equal to 2.5mm. In this installation mode, the support plate 4 can increase the electrical clearance (ie safety distance) between the incoming and outgoing copper bars on the contactor module and the fixing plate 5, thereby improving the safety of the contactor module.

Assuming that the output current of a single contactor is I _unit , then in this embodiment, the output current I _group of the contactor module=3*I _unit , and the corresponding overcurrent withstand capacity of the contactor module is also 3 times that of a single contactor.

Example 2:

As shown in Figure 2, in this embodiment, three groups of contactors are still used. The difference between this embodiment and Embodiment 1 is: first, each group of contactors includes two AC contactors, that is, the contactors in this embodiment The module includes a total of six contactors, and the six contactors are installed side by side on the support plate 4; secondly, the shape of the outgoing copper bar 11 in each group of contactors is a rake shape.

One end of the rake-shaped outlet copper bar includes six branches, and the six branches are respectively connected to each outlet end of two contactors in each group of contactors. The six outlet ends of the two adjacent contactors in each group of contactors are connected together in parallel through the rake-shaped outlet copper bars (which can be regarded as the connection of multiple "mountain"-shaped copper bars).

Therefore, the eighteen incoming wire terminals 6 in the contactor module are respectively drawn out through eighteen bar-shaped copper bars to form eighteen incoming wire terminals, and the formed incoming wire terminals are connected to the output terminals of the inverter; The six outlet terminals 9 in each group of contactors in the contactor module are connected in parallel with rake-shaped outlet copper bars to form three outlet terminals, which are used as the AC output terminals of the contactor module to connect to the circuit breaker and then merge into the power grid .

In this embodiment, the above-mentioned connection method is adopted for the incoming and outgoing copper bars in the contactor module, so that the current sharing characteristics of each branch are better than those of each branch in Embodiment 1.

Assuming that the output current of a single contactor is I unit, then in this embodiment, the output current I _group of the contactor module=6*I _unit , and the corresponding overcurrent withstand capacity of the contactor module is also 6 times that of a single contactor.

The support plate 4 used to support the contactor module in this embodiment and the fixing plate 5 used to fix the contactor module are suitable for the size of the contactor module, and its specific size can be compared to the support in embodiment 1. The size relationship between the plate 4 and the fixing plate 5 and the contactor module in Embodiment 1 is set; other structures and uses of the contactor module in this embodiment are the same as those in Embodiment 1, and will not be repeated here.

It should be understood here that the number of contactors in the contactor module is not limited to three in Embodiment 1 or six in Embodiment 2, and in practical applications, it can be determined according to the cost and capacity of a single contactor And the design of the overcurrent requirements of the AC output end of the inverter in the photovoltaic grid-connected inverter device. When the number of contactors in the contactor module is N times three (N is a natural number), the branch in the rake-shaped outgoing copper bar It is 3*N.

It can be understood that, the above embodiments are only exemplary embodiments adopted to illustrate the principles of the present invention, but the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present utility model, and these variations and improvements are also regarded as the protection scope of the present utility model.

Claims (10)

1. a contactor module comprises fixed head and is located at the contactor on the said fixed head, it is characterized in that; Said contactor adopts many groups; And the group number of contactor is three integral multiple, and said many windings tentaculum is installed on the fixed head side by side, in every winding tentaculum; The formation input terminal is drawn through the inlet wire copper bar in the end of incoming cables of said single contactor, and its leading-out terminal is drawn the formation outlet terminal through the outlet copper bar.

2. contactor module according to claim 1 is characterized in that, in every winding tentaculum, includes a plurality of ends of incoming cables and a plurality of leading-out terminal in the single contactor, and said a plurality of ends of incoming cables are respectively drawn through an inlet wire copper bar and formed a plurality of input terminals; Said a plurality of leading-out terminal is drawn through the parallel connection of an outlet copper bar and is formed a common outlet terminal.

3. contactor module according to claim 2; It is characterized in that include a contactor in said every winding tentaculum, this contactor comprises three ends of incoming cables and three leading-out terminals; The inlet wire copper bar that is connected with said each end of incoming cables be shaped as strip; Said outlet copper bar be shaped as " mountain " font, an end of said " mountain " font outlet copper bar includes three branches, said three branches are connected with three leading-out terminals of contactor respectively; Perhaps; Include two or more contactors in said every winding tentaculum; Wherein each contactor comprises three ends of incoming cables and three leading-out terminals, the inlet wire copper bar that is connected with said each end of incoming cables be shaped as strip, the rake type that is shaped as of said outlet copper bar; One end of this rake type outlet copper bar includes a plurality of branches, and each leading-out terminal in the two or more contactors in said a plurality of branches and the every winding tentaculum is connected respectively.

4. contactor module according to claim 3; It is characterized in that; Said outlet copper bar is provided with equal discharge orifice; Equal discharge orifice on the said outlet copper bar is arranged on the position corresponding with said branch, middle part of " mountain " font or rake type outlet copper bar, and it is shaped as strip, and its length direction is identical with the orientation of branch.

5. contactor module according to claim 1 is characterized in that, also includes supporting bracket in this contactor module, and said each contactor is fixed on the said supporting bracket, and said supporting bracket is arranged on the said fixed head.

6. contactor module according to claim 5 is characterized in that, said supporting bracket is square, and the length of supporting bracket is more than or equal to the overall width of a plurality of contactors, and said a plurality of contactors pass through bolt or screw respectively on supporting bracket.

7. contactor module according to claim 6 is characterized in that, said supporting bracket adopts to be covered the aluminium zine plate and process, and the thickness of said supporting bracket is more than or equal to 2.5mm.

8. according to the described contactor module of one of claim 1-7, it is characterized in that said fixed head adopts and covers the aluminium zine plate and process, the thickness of said fixed head is more than or equal to 2.5mm.

9. a photovoltaic network inverter comprises the contactor module, it is characterized in that, said contactor module adopts one of claim 1-8 described contactor module.

10. photovoltaic network inverter according to claim 9 is characterized in that said device also includes cabinet, and said contactor module is installed on the inwall of said cabinet.

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