CN115604958A - Current transformer - Google Patents

Abstract

The invention provides a converter, which comprises a cabinet body, wherein a reactor is arranged on one side of the front bottom layer of the cabinet body, a power module electrically connected with the reactor is arranged above the reactor, an air inlet is formed in the top of the cabinet body, an air outlet is formed in the bottom of the cabinet body, and a fan is arranged in the cabinet body at a position close to the air inlet. According to the converter provided by the invention, the devices are connected nearby through a compact design, the connection cost among the devices is reduced, key devices in the cabinet body are convenient to disassemble, assemble and maintain daily, and the heat dissipation effect can be effectively improved.

Description

Converter

technical field

The invention relates to the technical field of power electronic technology converter equipment, in particular to a converter.

Background technique

The Power Conversion System (PCS) can control the charging and discharging process of the battery, and convert AC to DC. It can directly supply power to AC loads in the absence of a grid, effectively regulates power resources, and can be well balanced It is an important prerequisite for the application of renewable energy and an effective means to realize the intelligent management of the power grid to adjust the surplus and shortage of power consumption differences between day and night and in different seasons, and to ensure the safety of the power grid.

At present, the outdoor energy storage converters in the prior art have the following problems: key components such as power modules, reactors, and switches in the converter cabinet are inconvenient for installation and daily maintenance; the heat dissipation performance of the components in the converter cabinet is poor, resulting in The failure rate is high; the anti-electromagnetic interference ability of the components in the converter cabinet is insufficient.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a converter, which realizes the nearby connection of devices through compact design, reduces the connection cost between devices, and facilitates disassembly and daily maintenance of key devices inside the cabinet. , can effectively improve the cooling effect.

In order to solve the problems of the technologies described above, the technical solution proposed by the present invention is:

A converter, comprising a cabinet, wherein a reactor is arranged on one side of the front bottom of the cabinet, a power module electrically connected to the reactor is arranged above the reactor, an air inlet is arranged on the top of the cabinet, and the cabinet The bottom of the body is provided with an air outlet, and a fan is arranged in the cabinet near the air inlet.

According to the converter of the present invention, the reactor with a large weight and volume is placed on one side of the lower layer of the front of the cabinet, which not only facilitates the installation and maintenance of the reactor, but also ensures that the overall center of gravity of the cabinet is low, improving the structure of the cabinet. Stability, the power module is placed above the reactor, so that the power module can be installed and maintained directly from the front of the cabinet, and at the same time, the reactor can be connected to the nearest reactor from the power module, so that the connecting copper bar is shorter and the required The amount of copper bars used is less to achieve the goal of reducing the cost of converter copper bars. The fan sucks air into the cabinet from the air inlet on the top of the cabinet, and the sub-chambers dissipate heat from the components in the cabinet in turn, and then discharge the air from the bottom of the cabinet. Can effectively improve the cooling effect.

For the above technical solution, further improvements as described below can also be made.

According to the converter of the present invention, in a preferred embodiment, a DC fuse is provided on the other side of the front bottom of the cabinet, a DC isolating switch and an AC frame circuit breaker are arranged side by side on the back bottom of the cabinet, and the DC fuse The breaker is electrically connected to the DC isolating switch, and the AC frame circuit breaker is electrically connected to the reactor.

Specifically, after the external cable on the DC side is connected to the converter through the DC fuse from the bottom of the cabinet, it is connected to the DC isolating switch on the other side of the lower layer at the back of the cabinet nearby, so that the connecting copper bar is relatively short, and the required copper bar The amount used is less to achieve the goal of reducing the cost of the copper bars of the converter. The DC isolating switch and the AC frame circuit breaker with a large weight and volume are placed side by side on the lower layer of the back of the cabinet, which makes the overall center of gravity of the cabinet lower and ensures that the converter cabinet It is safer during forklifting and hoisting, and the DC isolating switch and AC frame circuit breaker can be directly disassembled and maintained by opening the back door of the cabinet, which greatly saves maintenance costs, and the AC frame circuit breaker is located on one side of the lower layer of the cabinet It can not only satisfy the AC side outlet from the side, but also meet the AC side outlet from the bottom, so as to meet the differentiated needs of different customers for the AC side outlet.

Further, in a preferred embodiment, a DC capacitor pool located on the back of the power module is provided on the upper back of the cabinet, and the DC capacitor pool is electrically connected to the power module.

Specifically, the DC capacitor pool is located on the upper back of the cabinet and the back of the power module, so that the power module can be directly connected to the DC capacitor pool through the composite busbar, and the DC capacitor pool can be directly disassembled and maintained on the back of the cabinet.

Further, in a preferred embodiment, an AC electromagnetic interference filter and a DC electromagnetic interference filter are provided in the cabinet.

The EMI filter (electromagnetic interference filter) interface is reserved on the AC and DC sides of the cabinet, which can improve the anti-electromagnetic interference ability of the converter.

Specifically, in a preferred embodiment, the AC electromagnetic interference filter includes an AC magnetic ring and an AC filter board, the AC filter board is located on the upper layer at the back of the cabinet, the AC magnetic ring is located at the back of the cabinet near the bottom, and the AC magnetic ring, The AC filter board and the AC frame circuit breaker are electrically connected in turn. The DC electromagnetic interference filter includes a DC magnetic ring and a DC filter board. The DC magnetic ring is located at the bottom of the front of the cabinet near the top. The magnetic ring, the DC filter board and the DC isolating switch are electrically connected in sequence.

Specifically, the magnetic ring on the DC side is placed above the DC fuse on the front of the cabinet, the filter board on the DC side is placed below the DC fuse, the magnetic ring on the AC side is located below the AC frame circuit breaker, and the filter board on the AC side is located above the DC capacitor pool . The DC EMI filter is close to the DC side of the converter for easy electrical connection with the DC side of the converter, and the AC EMI filter is close to the AC side of the converter for easy electrical connection with the AC side of the converter.

Specifically, in a preferred embodiment, the fan includes a main fan, a first auxiliary fan, and a second auxiliary fan, wherein the main fan and the first auxiliary fan are arranged adjacent to each other and are located near the air inlet on the front of the cabinet, the second The second auxiliary fan is located at the back of the cabinet close to the air inlet.

Specifically, the heat dissipation channels are as follows: the main fan sucks air from the air inlet at the top of the cabinet to enter the cabinet, dissipates heat from the power module and reactor, and then discharges air from the air outlet at the bottom of the cabinet; the first auxiliary fan draws air from the cabinet The top louver sucks air into the cabinet, dissipates heat from the control devices and DC fuses in turn, and then discharges air from the bottom of the cabinet; the second auxiliary fan sucks air from the top louvers into the cabinet, and sequentially cools the DC capacitor pool, The filter capacitor, DC isolating switch, and AC frame circuit breaker conduct heat dissipation, and then the air is discharged from the bottom of the cabinet. The control device is arranged on the side of the power module to facilitate electrical connection with the power module.

Further, in a preferred embodiment, a heat exchanger is arranged on the cabinet to dissipate heat from components inside the cabinet.

The heat exchanger realizes the heat dissipation of the power module, reactor and electrical chamber in the cabinet, which not only improves the heat dissipation efficiency, but also improves the protection level of the cabinet. The cabinet can be used directly outdoors without using containers for installation. This greatly reduces the cost of the converter itself, and realizes a substantial miniaturization and weight reduction of the cabinet.

Specifically, in a preferred embodiment, the fan includes a main fan, an external circulation fan and an internal circulation fan, wherein the main fan is located near the air inlet on the front of the cabinet, and the external circulation fan sucks cold air from the outside into the heat exchanger Inside, the hot air in the heat exchanger is blown to the outside, and the internal circulation fan blows the cold air inside the heat exchanger into the cabinet to realize the air circulation in the cabinet.

Specifically, in a preferred embodiment, the internal circulation fan includes a first internal circulation fan and a second internal circulation fan, wherein the first internal circulation fan is connected to the heat exchanger and is located near the top of the side of the cabinet, and the second The second internal circulation fan is located at the bottom of the cabinet.

Specifically, the main heat dissipation channel is: the main fan sucks air from the air inlet at the top louver of the cabinet into the cabinet, dissipates heat from the power module and reactor, and then discharges air from the air outlet at the bottom of the cabinet; the secondary heat dissipation channel is: through The heat exchanger dissipates heat from the internal components of the cabinet, which is divided into external circulation and internal circulation. The external circulation fan sucks cold air from the outside into the heat exchanger, and then blows the hot air in the heat exchanger into the air. The inside of the heater core exchanges heat with the hot air in the internal circulation, and the heat in the internal circulation is taken away, thereby reducing the internal temperature of the heat exchanger. The first internal circulation fan blows the cold air inside the heat exchanger into the cabinet, and the cabinets are turned on in turn. The devices in the body dissipate heat, including DC capacitor pool, filter capacitor, DC isolating switch, AC frame circuit breaker, and DC fuse. The second internal circulation fan is located at the bottom of the cabinet and cooperates with the first internal circulation fan to circulate the air in the cabinet. .

Further, in a preferred embodiment, the heat exchanger is arranged outside the rear door of the cabinet.

The heat exchanger is placed outside the rear door of the cabinet, which is convenient for installation and maintenance, and does not occupy the space in the cabinet, which greatly saves the space in the cabinet and makes the cabinet more miniaturized.

Compared with the prior art, the present invention has the advantages of: realizing the nearby connection of devices through compact design, reducing the connection cost between devices, the key devices inside the cabinet are convenient for disassembly and daily maintenance, and the components in the cabinet are sequentially carried out in different chambers. Heat dissipation can effectively improve the heat dissipation effect.

Description of drawings

Hereinafter, the present invention will be described in more detail based on the embodiments with reference to the accompanying drawings. in:

Fig. 1 schematically shows the overall structure of the converter of Embodiment 1 of the present invention;

Fig. 2 schematically shows the overall structure of the converter of Embodiment 2 of the present invention;

Fig. 3 schematically shows the side view structure of the converter of Embodiment 2 of the present invention;

Fig. 4 schematically shows the rear view structure of the converter of Embodiment 2 of the present invention;

Fig. 5 schematically shows the internal front device layout of the converter of the embodiment of the present invention;

Fig. 6 schematically shows the internal rear device layout of the converter of the embodiment of the present invention;

Fig. 7 schematically shows the heat dissipation scheme of the converter of Embodiment 1 of the present invention;

Fig. 8 schematically shows the heat dissipation scheme of the converter of Embodiment 1 of the present invention;

Fig. 9 schematically shows the heat dissipation scheme of the converter of Embodiment 2 of the present invention;

Fig. 10 schematically shows the heat dissipation scheme of the converter in Embodiment 2 of the present invention.

In the figures, the same parts are given the same reference numerals. The figures are not drawn to scale.

detailed description

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited thereby.

Fig. 1 schematically shows the overall structure of the converter in Embodiment 1 of the present invention. Fig. 2 schematically shows the overall structure of the converter of Embodiment 2 of the present invention. Fig. 3 schematically shows the side view structure of the converter according to Embodiment 2 of the present invention. Fig. 4 schematically shows the rear view structure of the converter according to Embodiment 2 of the present invention. Fig. 5 schematically shows the internal front-side component layout of the converter according to the embodiment of the present invention. Fig. 6 schematically shows the layout of internal backside components of the converter according to the embodiment of the present invention. Fig. 7 schematically shows the heat dissipation scheme of the converter in Embodiment 1 of the present invention. Fig. 8 schematically shows the heat dissipation scheme of the converter in Embodiment 1 of the present invention. Fig. 9 schematically shows the heat dissipation scheme of the converter in Embodiment 2 of the present invention. Fig. 10 schematically shows the heat dissipation scheme of the converter in Embodiment 2 of the present invention.

Example 1

As shown in Fig. 1, Fig. 5 and Fig. 6, the converter 100 of this embodiment includes a cabinet body, wherein a reactor 2 is arranged on one side of the front bottom of the cabinet body, and a reactor 2 is arranged in the upper chamber of the reactor 2 There is a power module 1 electrically connected to it, the top of the cabinet is provided with an air inlet 7 , the bottom of the cabinet is provided with an air outlet 8 , and a fan is provided in the cabinet near the air inlet 7 .

According to the converter of the embodiment of the present invention, the reactor with a large weight and volume is placed on one side of the lower layer of the front of the cabinet, which not only facilitates the installation and maintenance of the reactor, but also ensures that the overall center of gravity of the cabinet is low, improving the efficiency of the cabinet. The stability of the overall structure, the power module is placed above the reactor, so that the power module can be installed and maintained directly from the front of the cabinet, and at the same time, the reactor can be connected to the nearest reactor from the power module, so that the connecting copper bar is shorter , the required amount of copper bars is less, to achieve the goal of reducing the cost of converter copper bars, the fan sucks air from the air inlet on the top of the cabinet into the cabinet, and the sub-chambers dissipate heat from the components in the cabinet in turn, and then from the bottom of the cabinet The wind can effectively improve the cooling effect.

As shown in FIG. 5 , specifically, in this embodiment, a control device 4 arranged opposite to the power module is arranged in the upper chamber on the front of the cabinet.

As shown in Figure 6, specifically, in this embodiment, a DC fuse 3 is provided on the other side of the front bottom layer of the cabinet, and a DC isolation switch 9 and an AC frame circuit breaker 10 are arranged side by side on the back bottom layer of the cabinet. The DC fuse 3 is electrically connected to the DC isolating switch 9 , and the AC frame circuit breaker 10 is electrically connected to the reactor 2 .

Specifically, after the external cable on the DC side is connected to the converter through the DC fuse from the bottom of the cabinet, it is connected to the DC isolating switch on the other side of the lower layer at the back of the cabinet nearby, so that the connecting copper bar is relatively short, and the required copper bar The amount used is less to achieve the goal of reducing the cost of the copper bars of the converter. The DC isolating switch and the AC frame circuit breaker with a large weight and volume are placed side by side on the lower layer of the back of the cabinet, which makes the overall center of gravity of the cabinet lower and ensures that the converter cabinet It is safer during forklifting and hoisting, and the DC isolating switch and AC frame circuit breaker can be directly disassembled and maintained by opening the back door of the cabinet, which greatly saves maintenance costs, and the AC frame circuit breaker is located on one side of the lower layer of the cabinet It can not only satisfy the AC side outlet from the side, but also meet the AC side outlet from the bottom, so as to meet the differentiated needs of different customers for the AC side outlet.

As shown in FIG. 6 , further, in this embodiment, a DC capacitor pool 11 located on the back of the power module 1 is provided on the upper back of the cabinet, and the DC capacitor pool 11 is electrically connected to the power module 1 . Specifically, the DC capacitor pool is located on the upper back of the cabinet and the back of the power module, so that the power module can be directly connected to the DC capacitor pool through the composite busbar, and the DC capacitor pool can be directly disassembled and maintained on the back of the cabinet.

As shown in FIGS. 5 to 10 , further, in this embodiment, an AC EMI filter and a DC EMI filter are provided in the cabinet. The EMI filter (electromagnetic interference filter) interface is reserved on the AC and DC sides of the cabinet, which can improve the anti-electromagnetic interference ability of the converter.

Specifically, in this embodiment, the AC electromagnetic interference filter includes an AC magnetic ring 19 and an AC filter board 18, the filter capacitor 12 and the AC filter board 18 are located on the upper layer of the back of the cabinet, and the AC magnetic ring 19 is located on the back of the cabinet near the bottom. position, the AC magnetic ring 19, the AC filter board 18 and the AC frame circuit breaker 10 are electrically connected in sequence, the DC electromagnetic interference filter includes the DC magnetic ring 20 and the DC filter board 21, and the DC magnetic ring 20 is located at the front bottom of the cabinet near the top position, the DC filter board 21 is located on the side of the DC fuse 3, and the DC magnetic ring 20, the DC filter board 21 and the DC isolating switch 9 are electrically connected in sequence. Specifically, the DC magnetic ring 20 is placed above the DC fuse 3 on the front of the cabinet, the DC filter board 21 is placed below the DC fuse 3, the AC magnetic ring 19 is located under the AC frame circuit breaker 10, and the AC filter board is located in the DC capacitor pool 11 the upper side. One end of the filter capacitor 12 is connected to the reactor 2, and the other end is connected to the AC frame circuit breaker 10. The filter capacitor 12 can effectively filter and ensure smoother circuit output. The DC EMI filter is close to the DC side of the converter for easy electrical connection with the DC side of the converter, and the AC EMI filter is close to the AC side of the converter for easy electrical connection with the AC side of the converter.

As shown in Figures 7 and 8, specifically, in this embodiment, the fans include a main fan 5, a first auxiliary fan 6 and a second auxiliary fan 13, wherein the main fan 5 and the first auxiliary fan 6 are arranged adjacently And it is located at the front of the cabinet near the air inlet 7, and the second auxiliary fan 13 is located at the back of the cabinet near the air inlet 7. Specifically, the heat dissipation channel is as follows: the main fan 5 sucks air from the air inlet 7 at the louver on the top of the cabinet and enters the cabinet to dissipate heat from the power module 1 and the reactor 2, and then discharges air from the air outlet 8 at the bottom of the cabinet; the first The auxiliary fan 6 sucks air into the cabinet from the air inlet 7 at the louver on the top of the cabinet, heats up the control device 4 and the DC fuse 3 in turn, and then discharges the air from the bottom of the cabinet; the second auxiliary fan 13 flows from the louver at the top of the cabinet The air inlet 7 sucks air into the cabinet, dissipates heat to the DC capacitor pool 11, the filter capacitor 12, the DC isolating switch 9, and the AC frame circuit breaker 10 in turn, and then discharges the air from the air outlet 8 at the bottom of the cabinet. The control device 4 is arranged on the side of the power module 1 to facilitate electrical connection with the power module 1 .

Example 2

As shown in Fig. 2 to Fig. 4 and Fig. 10, the difference between this embodiment and the above-mentioned embodiment 1 is that a heat exchanger 14 is provided on the cabinet body for cooling the components inside the cabinet body. After the heat exchanger is added, because the electronic chamber does not need straight vents, the airtightness of the cabinet is improved. Therefore, the heat exchanger is used to realize the heat dissipation of the power module, reactor and electrical chamber in the cabinet, which not only improves the heat dissipation efficiency, and improve the protection level of the cabinet, the cabinet can be used directly outdoors without using containers for installation, and can be used in desert and coastal environments to meet the harsh environmental requirements of sandstorms and corrosive air, while improving the internal electronic devices The service life is longer, the maintenance cost is reduced, the cost of the converter itself is greatly reduced, and the cabinet body is greatly miniaturized and lightened.

As shown in Figure 10, specifically, in this embodiment, the fan includes a main fan 5, an external circulation fan 16 and an internal circulation fan, wherein the main fan 5 is located near the air inlet 7 on the front of the cabinet, and the external circulation fan 16 Inhale cold air from 101 into the heat exchanger 14, then blow the hot air in the heat exchanger 14 into the air from 102, and the internal circulation fan blows the cold air inside the heat exchanger 14 into the cabinet and realizes Air circulation inside the cabinet. Specifically, in this embodiment, the internal circulation fan includes a first internal circulation fan 15 and a second internal circulation fan 17, wherein the first internal circulation fan 15 is connected to the heat exchanger 14 and is located near the top of the cabinet side , the second internal circulation fan 17 is located at the bottom of the cabinet.

As shown in Figure 9 and Figure 10, specifically, the main heat dissipation channel is: the main fan 5 sucks air from the air inlet 7 at the louver on the top of the cabinet and enters the cabinet to dissipate heat from the power module 1 and reactor 2, and then from the cabinet The air outlet 8 at the bottom of the body outputs air; the secondary heat dissipation channel is: through the heat exchanger 14, the internal components of the cabinet are radiated heat, which is divided into external circulation and internal circulation, and the external circulation fan 16 sucks cold air from 101 into the interior of the heat exchanger 14 , and then blow the hot air in the heat exchanger 14 into the air from 102, and exchange heat with the hot air in the inner circulation inside the core of the heat exchanger, and take away the heat in the inner circulation, thereby reducing the heat exchanger 14 Internal temperature, the first internal circulation fan 15 blows the cold air inside the heat exchanger 14 into the cabinet, and sequentially dissipates heat to the devices in the cabinet, including the DC capacitor pool 11, the filter capacitor 12, the DC isolating switch 9, and the AC frame circuit breaker 10. The DC fuse 3, the second internal circulation fan 17 is located at the bottom of the cabinet, and cooperates with the first internal circulation fan 15 to circulate the air in the cabinet.

As shown in FIG. 2 , further, in this embodiment, the heat exchanger 14 is arranged outside the rear door of the cabinet. The heat exchanger is placed outside the rear door of the cabinet, which is convenient for installation and maintenance, and does not occupy the space in the cabinet, which greatly saves the space in the cabinet and makes the cabinet more miniaturized.

According to the above-mentioned embodiments, it can be seen that the converter involved in the present invention realizes the nearby connection of devices through compact design, reduces the connection cost between devices, facilitates disassembly and assembly of key devices inside the cabinet and daily maintenance, and can effectively improve the heat dissipation effect.

While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for parts thereof without departing from the scope of the invention. In particular, as long as there is no structural conflict, the technical features mentioned in the various embodiments can be combined in any manner. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims (10)

1. A converter, characterized in that it comprises a cabinet; wherein, A reactor is provided on one side of the front bottom of the cabinet, and a power module electrically connected to the reactor is provided above the reactor; The top of the cabinet is provided with an air inlet, the bottom of the cabinet is provided with an air outlet, and a fan is provided in the cabinet near the air inlet. 2. The converter according to claim 1, wherein a DC fuse is provided on the other side of the front bottom of the cabinet, and a DC isolating switch and an AC frame are arranged side by side on the back bottom of the cabinet A circuit breaker; the AC frame circuit breaker is electrically connected to the reactor. The DC fuse is electrically connected to the DC isolation switch. 3. The converter according to claim 2, wherein a DC capacitor pool located on the back of the power module is arranged on the upper back of the cabinet, and the DC capacitor pool is electrically connected to the power module . 4. The converter according to claim 2 or 3, characterized in that, the cabinet is provided with an AC EMI filter and a DC EMI filter. 5. The converter according to claim 4, wherein the AC electromagnetic interference filter comprises an AC magnetic ring and an AC filter board, the AC filter board is located on the upper layer at the back of the cabinet, and the AC magnetic The ring is located at the back of the cabinet close to the bottom, and the AC magnetic ring, the AC filter board and the AC frame circuit breaker are electrically connected in sequence; The DC electromagnetic interference filter includes a DC magnetic ring and a DC filter board, the DC magnetic ring is located near the top of the cabinet front bottom, the DC filter board is located on the side of the DC fuse, and the DC magnetic ring The ring, the DC filter board and the DC isolation switch are electrically connected in sequence. 6. The converter according to any one of claims 1 to 3, wherein the fans include a main fan, a first auxiliary fan and a second auxiliary fan; wherein, The main fan and the first auxiliary fan are arranged adjacent to each other and are located near the air inlet on the front of the cabinet; The second auxiliary fan is located at the back of the cabinet close to the air inlet. 7. The converter according to any one of claims 1 to 3, characterized in that, a heat exchanger is arranged on the cabinet to dissipate heat from components inside the cabinet. 8. The converter according to claim 7, wherein the fan comprises a main fan, an external circulation fan and an internal circulation fan; wherein, The main fan is located near the air inlet on the front of the cabinet; The external circulation fan sucks cold air from the outside into the heat exchanger, and then blows the hot air in the heat exchanger to the outside; The internal circulation fan blows the cold air inside the heat exchanger into the cabinet and realizes the air circulation in the cabinet. 9. The converter according to claim 8, wherein the internal circulation fan comprises a first internal circulation fan and a second internal circulation fan; wherein, The first internal circulation fan is connected to the heat exchanger and is located near the top of the cabinet, and the second internal circulation fan is located at the bottom of the cabinet. 10. The converter according to claim 7, wherein the heat exchanger is arranged outside the rear door of the cabinet.

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