CN114865496A - A megawatt outdoor PCS cabinet - Google Patents

Abstract

The invention relates to a megawatt-level outdoor PCS cabinet, which belongs to the technical field of outdoor cabinet design of air-cooled machines. The cabinet body includes a closed main protection area and an open secondary protection area which are isolated from each other; the secondary protection area includes an upper air inlet chamber located at the upper part of the cabinet body and communicated with the outside world; a heat exchanger is arranged adjacent to the upper air inlet chamber; The heat exchanger communicates with the primary and secondary shielded areas, respectively. The invention can effectively balance the contradiction between protection and heat dissipation, and realize high-power heat dissipation under the requirement of high protection level with high cost performance; in the invention, all key sensitive components are placed in a high-protection closed area, and it is easy to realize the control of temperature and humidity , which can cope with extreme outdoor climatic conditions; through the special design of the heat exchanger structure and installation position, the large air volume provided by the main cooling fan is cleverly borrowed, which not only saves the number of external circulation fans, but also improves the heat exchange capacity of the heat exchanger.

Description

A megawatt outdoor PCS cabinet

technical field

The invention relates to a megawatt-level outdoor PCS (Power Conversion System, energy storage converter) cabinet, which belongs to the technical field of outdoor cabinet design of air-cooled machines.

Background technique

The protection and heat dissipation effect of the internal components of the high-power megawatt PCS is an important factor affecting the reliable operation of the equipment. For strong air cooling, protection and heat dissipation are a pair of contradictions. High protection counteracts heat dissipation performance and increases heat dissipation costs, while smooth heat dissipation and ventilation will also counteract the protection level, especially in outdoor application scenarios. The above contradiction is more prominent. The existing PCS cabinet design layout includes a completely open heat dissipation design with a relatively low protection level, a fully enclosed design with a high protection level, and a combination of closed and open. Fully open design, there are also minimum protection level requirements (usually not less than IP43). First, high protection and high resistance will bring great difficulties to the selection of cooling fans, and will greatly increase the manufacturing cost; secondly, the open structure cannot effectively control the humidity of the internal space; the completely closed design, although the environmental adaptability is obviously improved, but The main internal heat needs to be diffused to the external environment by one or more heat exchangers. Heat exchangers with high heat exchange capacity will have problems of large volume and high cost, and there are also many limitations in engineering implementation. In view of the limitations of the above two solutions, there is an urgent need in the technical field for an efficient combination solution, which is different from the existing open and closed combination forms, balances the cost-effectiveness, and solves the contradiction between the protection and heat dissipation of large-capacity outdoor PCS cabinets. This further increases the limits of air-cooled cooling applications.

SUMMARY OF THE INVENTION

The purpose of the present invention is to solve the contradiction between the protection and heat dissipation of the large-capacity outdoor PCS cabinet, and further improve the technical problem of the application limit of air-cooled heat dissipation.

In order to achieve the purpose of solving the above problems, the technical solution adopted by the present invention is to provide a megawatt-level outdoor PCS cabinet, the cabinet body is provided with an upper air inlet structure and a lower air outlet structure; The protection area and an open secondary protection area; the secondary protection area includes an upper air inlet chamber set on the upper part of the cabinet and communicated with the outside world; a heat exchanger is arranged adjacent to the upper air inlet chamber; The secondary protection area is connected.

Preferably, the secondary protection area includes an upper air inlet chamber, a heat exchanger, a fan air cavity, a module radiator air duct, a reactor air cavity and an air outlet which are sequentially communicated from the upper part of the cabinet to the lower part; There is a main cooling centrifugal fan.

Preferably, the main protection area includes a heat exchanger, a DC capacitor air cavity, a main protection part area 1 and a main protection part area 2 which are communicated in sequence; an auxiliary centrifugal fan is arranged in the main protection area.

Preferably, an auxiliary centrifugal fan is arranged adjacent to the heat exchanger; the air from the auxiliary centrifugal fan flows back to the auxiliary centrifugal fan through the heat exchanger, the DC capacitor air cavity, the main protection part area 1 and the main protection part area 2 in sequence. fan.

Preferably, a control element area is further provided between the auxiliary centrifugal fan and the DC capacitor air cavity; the air from the auxiliary centrifugal fan returns to the auxiliary centrifugal fan through the heat exchanger, the DC capacitor air cavity and the control element area in sequence.

Preferably, the upper air inlet chamber includes a top surface, a side surface with louvers and a bottom surface connected in sequence; the top surface and the horizontal surface are provided with an angle; the bottom surface is provided with a through hole for installing the heat exchanger, and the through hole is surrounded by There is a height-enhancing enclosure from the bottom surface perpendicular to the bottom surface; the side louvers are provided with openings parallel to the bottom surface; the top surface is provided with an air inlet baffle perpendicular to the bottom surface toward the bottom surface, and the air inlet baffles are parallel to the opening of the louver.

Preferably, the heat exchanger is provided with separate vertical flow channels and horizontal flow channels; the vertical flow channels are connected to the secondary protection area, and the horizontal flow channels are connected to the main protection area.

Preferably, a main cooling centrifugal fan is arranged below the heat exchanger, and fan air cavities are arranged around the main cooling centrifugal fan; a fan air guide ring is arranged between the main heat dissipation centrifugal fan and the heat exchanger, and the fan air guide ring is connected to the heat exchanger. A certain gap is reserved between the bottom surfaces of the heat exchanger; the bottom of the fan air cavity corresponding to the air outlet of the main cooling centrifugal fan is provided with a ventilation opening; there is a space for storing wind between the bottom of the fan air cavity and the main cooling centrifugal fan; The level of the edge of the vent is higher than the level of other parts of the bottom of the fan cavity.

Preferably, the heat exchanger further comprises a damping orifice plate, and the damping orifice plate is provided with a damping orifice for adjusting the air volume passing through the vertical flow channel.

Compared with the prior art, the present invention has the following beneficial effects:

1) For the air-cooled outdoor cabinet, the present invention can effectively balance the contradiction between protection and heat dissipation, and achieve high power density heat dissipation under the requirement of high protection level with high cost performance;

2) In the present invention, all key sensitive devices are placed in a high-protection closed area, which is easy to realize the control of temperature and humidity, and can cope with extreme outdoor climatic conditions;

3) In the present invention, through the special design of the structure and installation position of the heat exchanger, the vertical flow channel area is placed in the secondary protection area, and the large air volume provided by the main cooling fan is cleverly borrowed, which not only saves an external circulation fan but also improves the heat dissipation. heat transfer capacity of the exchanger.

Description of drawings

Fig. 1 is the front view structure schematic diagram of a kind of megawatt-level outdoor PCS cabinet of the present invention;

Fig. 2 is A-A sectional view in Fig. 1;

Figure 3 is a schematic diagram of the wind direction of Figure 2;

4 is a schematic diagram of the wind direction in a side view of a megawatt-level outdoor PCS cabinet of the present invention;

5 is a schematic diagram of the wind direction of a megawatt-level outdoor PCS cabinet heat exchanger according to the present invention;

6 is a partial schematic diagram of a fan air cavity of a megawatt-level outdoor PCS cabinet of the present invention;

Reference numerals: 1. Upper air inlet chamber; 11. Top surface; 12. Side surface; 121. Shutters; 122. Light plate; 13. Bottom surface; 21. Vertical flow channel; 22. Horizontal flow channel; 23. Damping orifice plate; 3. Main cooling centrifugal fan; 4. Fan air cavity; 41. Air vent; Air cavity; 7. DC capacitor air cavity; 81. Main protection part area 1; 82. Main protection part area 2; 9. Auxiliary centrifugal fan; 10. Control element area.

Detailed ways

In order to make the present invention more obvious and easy to understand, preferred embodiments are hereby described in detail with the accompanying drawings as follows:

As shown in Figures 1-6, the present invention provides a megawatt outdoor PCS cabinet. The cabinet body is provided with an upper air inlet structure and a lower air outlet structure; the cabinet body includes a closed main protection area and an open air outlet. the secondary protection area; the secondary protection area includes an upper air inlet chamber 1 located at the upper part of the cabinet and communicated with the outside world; a heat exchanger 2 is arranged adjacent to the upper air inlet chamber 1; the heat exchanger 2 is connected to the main protection area and the secondary protection area respectively. Connected. The secondary protection area includes an upper air inlet chamber 1, a heat exchanger 2, a fan air chamber 4, a module radiator air duct 5, a reactor air chamber 6 and an air outlet which are connected in sequence from the upper part of the cabinet to the lower part; A main cooling centrifugal fan 3 is provided. The main protection area includes a heat exchanger 2 , a DC capacitor air cavity 7 , a main protection part area 1 81 and a main protection part area 2 82 connected in sequence; an auxiliary centrifugal fan 9 is arranged in the main protection area. An auxiliary centrifugal fan 9 is arranged adjacent to the heat exchanger 2; the wind from the auxiliary centrifugal fan 9 flows back to the heat exchanger 2, the DC capacitor air cavity 7, the main protection part area 1 81 and the main protection part area 2 82 in sequence. Auxiliary centrifugal fan 9. There is also a control element area 10 between the auxiliary centrifugal fan 9 and the DC capacitor air cavity 7; the wind from the auxiliary centrifugal fan 9 returns to the auxiliary centrifugal fan through the heat exchanger 2, the DC capacitor air cavity 7 and the control element area 10 in sequence. 9. The upper air inlet chamber 1 includes a top surface 11, a side surface 12 and a bottom surface 13 connected in sequence; the top surface 11 and the horizontal plane are provided with an angle; the bottom surface 13 is provided with a through hole for installing the heat exchanger 2, and the through hole is surrounded by There is a height-enhancing enclosure 15 that is perpendicular to the bottom surface 13 from the bottom surface 13; the shutters 121 of the side 12 are provided with an opening parallel to the bottom surface 13; The air inlet baffle 14 is parallel to the opening of the shutter 121 . The heat exchanger 2 is provided with separate vertical flow channels 21 and horizontal flow channels 22; the vertical flow channel 21 communicates with the secondary protection area, and the horizontal flow channel 22 communicates with the main protection area. A main cooling centrifugal fan 3 is arranged below the heat exchanger 2, and a fan air cavity 4 is arranged around the main cooling centrifugal fan 3; a fan air guide ring 31 is arranged between the main cooling centrifugal fan 3 and the heat exchanger 2; A vent 41 is provided at the bottom of the fan cavity 4 corresponding to the air outlet of the centrifugal fan 3; a space for storing wind is provided between the bottom of the fan cavity 4 and the main cooling centrifugal fan 3; the level of the edge of the vent 41 is high The level of other parts at the bottom of the fan air cavity 4. The heat exchanger 2 further includes a damping orifice plate 23 , and the damping orifice plate 23 is provided with a damping orifice for adjusting the air volume passing through the vertical flow channel 21 .

Example

As shown in Figures 1-6, the present invention provides a megawatt-level outdoor PCS cabinet, the outdoor PCS cabinet adopts a welded frame, forced ventilation cooling, comprehensively considers the site and its own structural characteristics, and adopts the upper air inlet and lower air outlet mode; The overall layout adopts a combination of open and closed,

Specifically, it is divided into a closed main protection area, including DC capacitor air cavity 7, main protection part area 1 81 and main protection part area 2 82; an open secondary protection area, including upper air inlet chamber 1, fan air cavity 4, mold Set the radiator air duct 5 and the reactor air cavity 6; the two areas are isolated from each other;

The main protection area is airtight and isolated from the outside, with a high degree of protection (IP65), and the heat dissipation function is defined as an auxiliary heat dissipation area. Most components of the PCS are placed in this area. The device 2 achieves efficient heat exchange with the outside world;

The secondary protection area is connected to the outside world, and the protection level is low (IP23). The heat dissipation function is defined as the main heat dissipation area. The IGBT radiator fins, reactors and other devices with high heat generation and low protection requirements are placed in this area, and there is a main heat dissipation area. Centrifugal fan 3 provides driving force to achieve the overall design requirements, namely upper air inlet and lower air outlet;

The secondary protection area is the upper air inlet chamber 1, the fan air chamber 4, the module radiator air duct 5 and the reactor air chamber 6, which are designed in the relatively central part of the cabinet, and run up and down in the height direction of the whole cabinet. The top side of the cabinet is the air inlet. Just below the bottom of the cabinet is the air outlet; the main protection area, namely the DC capacitor air cavity 7, the main protection part area 1 81 and the main protection part area 2 82 surround the secondary protection area, and the two areas are completely isolated by necessary sealing measures to form together the entire cabinet space.

The top part of the cabinet is defined as the upper air inlet chamber 1, which is composed of a top surface 11, a side surface 12 and a bottom surface 13; the top surface 11 is two inclined top surfaces with a certain angle to avoid the deposition of rain and snow; the side surface 12 is 4 flexible sides There are drainage holes at the bottom of the side plates, among which three side plates are provided with shutters 121, and one side plate is a light plate 122; The square hole on it is used to connect the lower secondary protection area; see Figure 2;

Inside the upper air inlet chamber 1, corresponding to a certain distance between the side plates of the three shutters 121, there is an air inlet baffle 14 parallel to it, and the air inlet baffle 14 extends downward from the top of the cabinet to a certain distance from the bottom surface 13; The air is inhaled through the louver 121, affected by the guidance of the air inlet baffle 14, the wind direction changes from horizontal to vertical, and then turns to the horizontal direction again due to the influence of the bottom surface 13, and enters the heightened enclosure 15 located at the opening edge of the bottom surface 13 at a certain inclination angle. Climb up at the top, flow out of the upper air inlet chamber 1, and enter the lower secondary protection area; the heightened enclosure 15 is arranged along the edge of the square hole on the bottom surface 13, and the height extends to a certain distance from the top surface 11 of the cabinet; if the inhaled outside air contains rainwater , through the steering of the air inlet baffle 14, the variable speed design of the tuyere, and the height climbing, a certain degree of rainwater separation can be achieved to prevent rainwater from entering the secondary protection area; see Figure 2.

The lower part of the bottom surface 13 of the upper air inlet chamber 1 is the heat exchanger 2. The heat exchanger 2 is provided with independent staggered vertical flow channels 21 and horizontal flow channels 22. The vertical flow channels 21 can be understood as being placed in the air channel of the secondary protection area. , connecting the bottom surface 13 opening of the upper air inlet chamber 1 with the secondary protection area inside the cabinet; the horizontal flow channel 22 can be understood as being placed in the air channel in the main protection area, and both ends are connected to the main protection area. The heat exchange between the vertical and horizontal flow channels realizes the high-efficiency heat exchange between the enclosed main protection area and the outside world; see Figures 3 and 5.

The main cooling centrifugal fan 3 is installed at the lower part of the heat exchanger 2, the air inlet of the main cooling centrifugal fan 3 is facing upward, and a certain gap is reserved between the fan air guide ring 31 and the bottom surface of the heat exchanger 2, so as to facilitate the optimal cooling of the fan and the heat exchanger. Performance; the main cooling centrifugal fan 3 is surrounded by an air cavity, which is defined as fan air cavity 4 to form a dynamic effect of upper air intake and lower air outlet; a certain height size is reserved in the lower part of the fan air cavity 4, and there are no obstacles in it, forming The space for storing the air can achieve the effect of uniform air; the bottom of the fan air cavity 4 is provided with three rectangular vents 41, which are connected to the lower module radiator air duct 5, and the lower part of the module radiator air duct 5 is connected to the reactor air cavity 6, and the reactance The air cavity 6 is connected to the air outlet of the secondary protection area of the cabinet; see Figures 2 and 3.

The wind flow direction of the secondary protection area: the louver 121 in the air inlet area at the top of the cabinet enters the air, and enters the vertical flow channel 21 of the heat exchanger 2 directly below through the heightened enclosure 15 and the square hole of the bottom surface 13 of the upper air inlet chamber 1. Then it enters the centrifugal fan air cavity 4, passes through the three vents 41 at the bottom of the fan air cavity 4, enters the module radiator air duct 5, and then enters the reactor air cavity 6, and finally is discharged from the bottom air outlet to the outside of the cabinet; see Figure 3 Double arrows indicate.

The structural details in the sub-protection area include: the vertical flow channel 21 of the heat exchanger 2 placed in the sub-protection area does not occupy the entire air duct section of the sub-protection area perpendicular to its flow direction, but in its horizontal flow channel. A certain gap is left on the parallel sides, and the damping orifice plate 23 is installed to adjust the air volume passing through the vertical flow channel, that is to say, the total ventilation volume of the secondary protection area, and a part of the vertical flow through the heat exchanger with high resistance characteristics is vertical. A part of the fins of the flow channel 21 flows through the damping orifice 23 with low resistance characteristics on its side to reduce the wind resistance flowing through this section; see FIG. 5 .

The structural details in the secondary protection area also include: three rectangular vents 41 at the bottom of the air cavity of the main cooling fan, the edges of which are slightly higher than the bottom surface of the air cavity, to prevent the rainwater separated from the side wall of the air cavity from flowing into the lower module radiator air. In the duct 5; the connection part between the rectangular vent 41 of the air cavity and the air duct 5 of the module radiator is provided with sealing measures that are not affected by disassembly and assembly; see FIG. 6 .

In the main protection area, driven by the auxiliary centrifugal fan 9, the air circulates in the entire enclosed area, the hot air returns to the inlet of the circulation fan, and the outlet of the fan is connected to the horizontal flow channel 22 of the heat exchanger 2, and passes through the horizontal flow channel 22. After heat exchange, the outflow is cold air. The cold air first enters the DC capacitor air cavity 7, flows out through the outlet of the DC capacitor air cavity 7, flows through various heating elements in sequence, and finally returns to the fan inlet to form a cycle; The direction of the wind is indicated by the arrow.

The detailed features of the air duct structure in the main protection area include: the air duct behind the DC capacitor air cavity 7 is divided into two branches in parallel; the first branch is: flowing through the low-heating, temperature-sensitive control element area 10, a relatively closed rectangular space, circulation The wind flows along the diagonal path of the control element area 10 to achieve a sufficient cooling effect; the branch circuit 2 is: it connects to other spaces in the main protection area, and passes through the main protection part area 1 81 and the main protection part area 2 82 in sequence. There are mainly heat-generating and secondary temperature-sensitive components in switches, transformers, and copper bars; finally, the downwind ends of the two parallel branches meet at the inlet of the auxiliary circulation fan 9 . Referring to FIG. 4 , the hollow arrows indicate the wind flow direction of branch one, and the solid arrows indicate the wind flow direction of branch two.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form or substance. It should be pointed out that those of ordinary skill in the art can also Several improvements and additions have been made, and these improvements and additions should also be regarded as the protection scope of the present invention. All those skilled in the art, without departing from the spirit and scope of the present invention, can utilize the above-disclosed technical content to make some changes, modifications and equivalent changes of evolution, all belong to the present invention. Equivalent embodiments; at the same time, any modification, modification and evolution of any equivalent changes made to the above embodiments according to the essential technology of the present invention still fall within the scope of the technical solutions of the present invention.

Claims (9)

1. A megawatt-level outdoor PCS cabinet is characterized in that the cabinet body is provided with an upper air inlet structure and a lower air outlet structure; In the cabinet body, a closed main protection area and an open secondary protection area that are isolated from each other are included; The protection area includes an upper air inlet chamber arranged on the upper part of the cabinet and communicated with the outside world; a heat exchanger is arranged adjacent to the upper air inlet chamber; the heat exchanger is respectively connected with the main protection area and the secondary protection area. 2. The megawatt-level outdoor PCS cabinet according to claim 1, wherein the secondary protection area comprises an upper air inlet chamber, a heat exchanger, a fan air cavity, a mold and a heat exchanger that are communicated in sequence from the upper part of the cabinet to the lower part. A radiator air duct, a reactor air cavity and an air outlet are arranged; the fan air cavity is provided with a main cooling centrifugal fan. 3. A megawatt-level outdoor PCS cabinet according to claim 1, wherein the main protection area comprises a heat exchanger, a DC capacitor air cavity, a main protection part area 1 and a main protection part area that are connected in sequence 2. There is an auxiliary centrifugal fan in the main protection area. 4. A megawatt outdoor PCS cabinet according to claim 3, wherein an auxiliary centrifugal fan is arranged adjacent to the heat exchanger; the wind sent from the auxiliary centrifugal fan passes through the heat exchanger, the direct current The air accommodating chamber, the main protection part area 1 and the main protection part area 2 return to the auxiliary centrifugal fan. 5. A megawatt outdoor PCS cabinet according to claim 4, wherein a control element area is also provided between the auxiliary centrifugal fan and the DC capacitor air cavity; The heat exchanger, DC capacitor plenum and control element area return to the auxiliary centrifugal fan. 6. A kind of megawatt outdoor PCS cabinet according to claim 1, is characterized in that, described upper air inlet chamber comprises the top surface that is connected successively, is provided with the side and bottom surface of shutter; Described top surface and horizontal surface are provided with The bottom surface is provided with a through hole for installing the heat exchanger, and the through hole is surrounded by a raised enclosure that is perpendicular to the bottom surface from the bottom surface; the side shutters are provided with openings parallel to the bottom surface; The air inlet partition is perpendicular to the bottom surface, and the air inlet partition is parallel to the opening of the shutter. 7. A megawatt outdoor PCS cabinet according to claim 1, wherein the heat exchanger is provided with separate vertical flow channels and horizontal flow channels; the vertical flow channels communicate with secondary protection area, the horizontal flow channel is connected to the main protection area. 8. A megawatt-level outdoor PCS cabinet according to claim 2, wherein a main cooling centrifugal fan is arranged below the heat exchanger, and a fan air cavity is arranged around the main cooling centrifugal fan; There is a fan air guide ring between the fan and the heat exchanger, and there is a gap between the fan air guide ring and the bottom surface of the heat exchanger; the bottom of the fan air cavity corresponding to the air outlet of the main cooling centrifugal fan is provided with a vent; A space for storing wind is provided between the bottom of the air cavity and the main cooling centrifugal fan; the level of the edge of the vent is higher than that of other parts of the bottom of the fan cavity. 9 . The megawatt outdoor PCS cabinet according to claim 5 , wherein the heat exchanger further comprises a damping orifice plate, and the damping orifice plate is provided with a damping orifice for adjusting the air volume passing through the vertical flow channel. 10 . .

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