Modular energy storage converter

Abstract

The application relates to a modular energy storage converter and belongs to the technical field of converter design. The application divides the electrical elements into electrical elements with large heat generation and electrical elements with small heat generation according to the different heat generation of the electrical elements of the energy storage converter, and the electrical elements are arranged in different zones, the electrical elements with large heat generation are arranged on the other side of the circuit board and are cooled by the cooling fan, and the electrical elements with small heat generation are arranged on one side of the circuit board and are naturally cooled without the auxiliary cooling device, so that the number of the cooling fans is saved, the cost is reduced, the volume of the energy storage converter is reduced, and the power density is improved.

Description

Technical Field

[0001] This invention relates to the field of converter design technology, and specifically to a modular energy storage converter. Background Technology

[0002] With the increasing prevalence of clean energy, and in order to alleviate the existing energy shortage, the construction of wind power and solar power plants, along with their supporting energy storage equipment, is also growing. Simultaneously, industrial and commercial enterprises are increasingly utilizing peak-valley electricity price differences to construct supporting energy storage systems. A core component of energy storage equipment is the energy storage converter, which primarily controls the charging and discharging of batteries, converting between AC and DC power. The modular design of energy storage converters facilitates installation and replacement. Chinese utility model patent CN217984867U discloses a T-type three-level energy storage converter cabinet, which discloses a design scheme for an energy storage converter based on DC and AC side configuration. The scheme divides the electrical components into DC and AC side partitions. The components in both the DC and AC side partitions have components that generate a lot of heat. Therefore, heat dissipation channels and cooling fans must be set in both the DC and AC side partitions to prevent the components from being damaged due to heat. This method undoubtedly requires at least two sets of cooling fans respectively deployed in different partitions, which requires a large number of cooling fans, resulting in higher costs. Moreover, setting a large number of cooling fans will undoubtedly make the entire energy storage converter larger in size. Summary of the Invention

[0003] The purpose of this invention is to provide a modular energy storage converter to solve the problems of high cost and large size of energy storage converters caused by the large number of cooling fans used in the prior art.

[0004] To address the aforementioned technical problems, this invention provides a modular energy storage converter, with the following specific structure:

[0005] A modular energy storage converter includes a housing with a front panel and wiring terminals. Inside the housing are a conditioning and power board, an IGBT driver and capacitor board, an IGBT module, and a circuit board. The housing has an opening. The circuit board is vertically arranged inside the housing. The conditioning and power board and the IGBT driver and capacitor board are located on one side of the circuit board, and the IGBT module is located on the other side. The heat dissipation surface of the IGBT module is attached to an IGBT heat sink. A cooling fan is also located on the other side of the circuit board, facing the opening of the housing, for dissipating heat from the components located on the other side of the circuit board.

[0006] The beneficial effects of the above technical solution are as follows: Considering the different heat generation of the electrical components included in the converter, they are divided into electrical components with large heat generation and those with small heat generation. These components are separated by the circuit board. The electrical components with large heat generation are located on the other side of the circuit board and are cooled by a cooling fan, while the electrical components with small heat generation are located on one side of the circuit board and are cooled naturally without auxiliary cooling devices. In other words, the heat sink and cooling fan are only installed on the side with large heat generation, thereby achieving space saving while ensuring heat dissipation effect, resulting in a compact layout, small overall size, high power density, and reduced cost.

[0007] Furthermore, a DC disconnect switch and an AC circuit breaker are also provided on one side of the circuit board, located closest to the front panel on one side of the circuit board. The front panel is also provided with a DC disconnect switch operating handle and an AC circuit breaker operating handle. The actuating ends of the DC disconnect switch operating handle and the AC circuit breaker operating handle extend into the housing and are connected to the DC disconnect switch and the AC circuit breaker respectively, so as to control the DC disconnect switch and the AC circuit breaker accordingly.

[0008] The beneficial effects of the above technical solution are: placing the DC disconnect switch and AC circuit breaker in the position closest to the front panel facilitates the subsequent connection of the DC disconnect switch operating handle and the AC circuit breaker operating handle for operation.

[0009] Furthermore, the other side of the circuit board is also equipped with a grid-side filter inductor and an inverter-side filter inductor, with the grid-side filter inductor being positioned closer to the front panel than the inverter-side filter inductor.

[0010] The beneficial effects of the above technical solution are as follows: the heat generation of the grid-side filter inductor and the inverter-side filter inductor is relatively large, so they are placed on one side with the IGBT module. However, the heat generation of the grid-side filter inductor and the inverter-side filter inductor is smaller than that of the IGBT module, so they are placed in a position away from the cooling fan and close to the front panel.

[0011] Furthermore, the enclosure also includes an upper internal support component located inside the enclosure and above the circuit board. The upper internal support component is arranged horizontally and is equipped with a DC fuse, a soft start contactor, and a relay.

[0012] The beneficial effects of the above technical solution are as follows: the upper side of the circuit board is provided with an internal support for setting up DC fuses, soft start contactors and relays, which facilitates connection with DC disconnect switches.

[0013] Furthermore, the enclosure also includes a bottom plate and a lower internal support component located inside the enclosure and below the circuit board. There is a gap between the lower internal support component and the bottom plate, and an AC surge protector is installed in the gap.

[0014] The beneficial effects of the above technical solution are as follows: an internal support component is provided on the lower side of the circuit board for installing an AC surge protector, which facilitates connection with an AC circuit breaker.

[0015] Furthermore, the enclosure also includes a lower base plate and an upper shell. The upper shell is a concave plate with an opening facing downwards. The upper shell, lower base plate, and front panel are detachably connected together to form an opening.

[0016] The beneficial effects of the above technical solution are: the upper shell, lower base plate, and front panel are detachably connected, which facilitates the maintenance and installation of electrical components.

[0017] Furthermore, two rows of air inlets are provided on the front panel, located on the side close to the grid-side filter inductor and the inverter-side filter inductor.

[0018] The beneficial effects of the above technical solution are as follows: Since the grid-side filter inductor and the inverter-side filter inductor generate a lot of heat, air inlets are set on the front panel to assist in heat dissipation.

[0019] Furthermore, a front handle is also provided on the front panel.

[0020] The beneficial effects of the above technical solution are: the front handle facilitates the installation and removal of the converter from the housing.

[0021] Furthermore, a detachable side handle is installed on the side of the upper housing.

[0022] The beneficial effects of the above technical solution are: a side handle is provided on the side of the upper housing, which makes it convenient for two people to move the converter. Attached Figure Description

[0023] Figure 1 This is a front axonometric view of the modular energy storage converter of the present invention;

[0024] Figure 2 This is a left-side axonometric view of the modular energy storage converter of the present invention (with the upper housing hidden).

[0025] Figure 3 This is a right-side axonometric view of the modular energy storage converter of the present invention (with the upper housing hidden).

[0026] Figure 4 This is a left-side view of the modular energy storage converter of the present invention (with the upper housing, IGBT driver, and capacitor board hidden).

[0027] In the diagram: 1. Enclosure; 1.1 Upper shell; 1.2 Front panel; 1.3 Lower base plate; 1.4 Internal support components; 1.5 Side handle; 2. DC disconnect switch operating handle; 3. Indicator light panel; 4. AC circuit breaker operating handle; 5. Front handle; 6. AC terminal block; 7. DC terminal block; 8. Communication interface terminal block; 9. Non-electrical quantity interface terminal block; 10. DC disconnect switch; 11. AC circuit breaker; 12. Conditioning and power supply board; 13. IGBT driver and capacitor board; 14. Grid-side filter inductor; 15. Inverter-side filter inductor; 16. Heat sink; 17. Cooling fan; 18. DC fuse; 19. Soft start contactor; 20. Relay; 21. AC surge protector; 22. Connecting copper busbar; 23. IGBT module. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0029] Example of a modular energy storage converter device:

[0030] This invention also provides a modular energy storage converter, such as Figures 1-4 The components shown include: housing 1, upper shell 1.1, front panel 1.2, lower base plate 1.3, internal support 1.4, side handle 1.5, DC disconnect switch operating handle 2, indicator light panel 3, AC circuit breaker operating handle 4, front handle 5, AC terminal block 6, DC terminal block 7, communication interface terminal block 8, non-electrical interface terminal block 9, DC disconnect switch 10, AC circuit breaker 11, conditioning and power supply board 12, IGBT driver and capacitor board 13, grid-side filter inductor 14, inverter-side filter inductor 15, heat sink 16, cooling fan 17, DC fuse 18, soft start contactor 19, relay 20, AC surge protector 21, connecting copper busbar 22, and IGBT module 23.

[0031] like Figure 1 and Figure 2 The modular energy storage converter shown includes a housing 1, which consists of an upper shell 1.1, a front panel 1.2, a lower base plate 1.3, internal support components 1.4, and side handles 1.5. The upper shell 1.1 is a concave plate with an opening facing downwards. The upper shell 1.1, front panel 1.2, and lower base plate 1.3 are detachably connected for easy installation and maintenance of electrical components. The internal support components 1.4 are located inside the housing 1 and are used to house the electrical components. The internal support components 1.4 include an upper internal support component and a lower internal support component. The side handles 1.5 are detachable for easy handling of the converter by two people.

[0032] like Figure 1 and Figure 2The diagram illustrates a modular energy storage converter. The upper part of the front panel 1.2, from left to right, features DC terminal blocks 7, communication interface terminals 8, and non-electrical interface terminals 9. The DC terminal blocks 7 are connected to a DC disconnect switch 10. The middle section of the front panel 1.2 is divided into left and right sides. The left side features a DC disconnect switch operating handle 2 and an AC circuit breaker operating handle 4, which are connected to the DC disconnect switch 10 and AC circuit breaker 11 located at the rear of the front panel 1.2. An indicator light panel 3 is positioned in the center of the front panel 1.2 to display the converter's operating status. The right side of the front panel 1.2 has two rows of air inlets for auxiliary cooling of the grid-side filter inductor 14 and the inverter-side filter inductor 15. The lower part of the front panel 1.2 features a front handle 5 and an AC terminal block 6, which is connected to the AC circuit breaker 11. The energy storage converter terminals and operating handles are all located on the front panel, enabling complete front maintenance of the converter, reducing the need for opening the combiner cabinet door and maintenance space, and reducing the overall size of the combiner cabinet.

[0033] like Figure 2 and Figure 3 The diagram shows a modular energy storage converter with electrical components arranged vertically on both sides behind the front panel 1.2. On the left, closest to the front panel 1.2, are a DC disconnect switch 10 and an AC circuit breaker 11 arranged side-by-side from top to bottom. Next is the conditioning and power supply board 12, and finally, the IGBT driver board and capacitor board 13. One end of the DC disconnect switch 10 and AC circuit breaker 11 is connected to the DC terminal 7 and AC terminal 6 on the front panel 1.2 via a connecting copper busbar 22, and the other end is connected to the conditioning and power supply board 12 via a cable. The conditioning and power supply board 12 is connected to the IGBT driver board and capacitor board 13. On the right, closest to the front panel 1.2, is a grid-side filter inductor 14, followed by an inverter-side filter inductor 15. Finally, there is an IGBT module 23 and a heat sink 16 attached to the heat dissipation surface of the IGBT module 23. A cooling fan 17 is located behind the heat sink 16. The grid-side filter inductor 14, inverter-side filter inductor 15, and IGBT module 23, which generate a lot of heat, are placed on one side. The cooling fan 17 accelerates the airflow over the surface of the heat-generating components, improving the heat dissipation efficiency of the heat sink 16. The conditioning and power board 12, IGBT driver board, and capacitor board 13, which generate less heat, are placed on one side without auxiliary cooling devices, allowing for natural heat dissipation and saving space.

[0034] like Figure 2 and Figure 3The modular energy storage converter shown also includes a DC fuse 18, a soft-start contactor 19, a relay 20, and an AC surge protector 21. The DC fuse 18, soft-start contactor 19, and relay 20 are located on the upper internal support component, which is horizontally arranged on the upper side of the circuit board, to achieve soft starting of the converter and reduce the impact on the main circuit electrical components. The AC surge protector 21 is located in the gap between the lower internal support component, which is horizontally arranged on the lower side of the circuit board, and the lower base plate 1.3, to prevent grid-side overvoltage from impacting the converter and protect its safety.

[0035] Specific implementation methods have been given above, but the present invention is not limited to the described implementation methods. The basic idea of ​​the present invention lies in the above basic scheme. For those skilled in the art, designing various modified models, formulas, and parameters based on the teachings of the present invention does not require creative effort. Changes, modifications, substitutions, and variations made to the implementation methods without departing from the principles and spirit of the present invention still fall within the protection scope of the present invention.

Claims

1. A modular energy storage converter comprising a cabinet, the cabinet comprising a front panel having wiring terminals disposed thereon, the cabinet having disposed therein conditioning and power supply boards, IGBT drive and capacitor boards, and IGBT modules and circuit boards, characterised in that, The box further comprises a lower bottom plate and an upper shell which is a concave plate with an opening facing downward, the upper shell, the lower bottom plate and the front panel form an opening facing backward; the circuit board is vertically arranged in the box, the conditioning and power supply board and the IGBT drive and capacitor board are arranged on the left side of the circuit board, the net side filter inductor is arranged on the right side of the circuit board closest to the front panel, the inverter side filter inductor is arranged next, the IGBT module and the IGBT radiator which is attached to the heat dissipation surface of the IGBT module are arranged last, two rows of air inlet holes are arranged on the right side of the front panel corresponding to the net side filter inductor, a heat dissipation fan is further arranged on the right side of the circuit board at the rear of the IGBT radiator, the heat dissipation fan faces the opening of the box and is used for dissipating heat for each element on the right side of the circuit board, and each element on the left side of the circuit board relies on natural heat dissipation.

2. The modular energy storage converter of claim 1, wherein, The direct current disconnecting switch and the alternating current circuit breaker are further arranged on the left side of the circuit board and located closest to the front panel, the direct current disconnecting switch operating handle and the alternating current circuit breaker operating handle are further arranged on the front panel, the action end of the direct current disconnecting switch operating handle and the alternating current circuit breaker operating handle extends into the box and is connected with the direct current disconnecting switch and the alternating current circuit breaker to control the direct current disconnecting switch and the alternating current circuit breaker.

3. The modular energy storage converter of claim 2, wherein, The direct current disconnecting switch is located above the alternating current circuit breaker, the direct current wiring terminal connected with the direct current disconnecting switch is located on the upper part of the front panel, the alternating current wiring terminal connected with the alternating current circuit breaker is located on the lower part of the front panel, the direct current disconnecting switch operating handle is located above the alternating current circuit breaker operating handle, and the direct current disconnecting switch operating handle and the alternating current circuit breaker operating handle are located between the alternating current wiring terminal and the alternating current wiring terminal.

4. The modular energy storage converter of claim 1, wherein, The box further comprises an upper internal support located in the box and on the upper side of the circuit board, the upper internal support is arranged transversely, and the direct current fuse, the soft start contactor and the relay are arranged on the upper internal support.

5. The modular energy storage converter of claim 1, wherein, The box further comprises a lower internal support located in the box and on the lower side of the circuit board, a gap is formed between the lower internal support and the lower bottom plate, and the alternating current lightning protection device is arranged in the gap.

6. The modular energy storage converter of claim 1, wherein, The upper shell and the lower bottom plate and the front panel are detachably connected together.

7. The modular energy storage converter of claim 3, wherein, The communication interface terminal and the non-electric quantity interface terminal are arranged on the right side of the direct current wiring terminal in sequence.

8. The modular energy storage converter of claim 1, wherein, The front pull handle is further arranged on the front panel.

9. The modular energy storage converter of claim 6, wherein, The detachable side pull handle is mounted on the side of the upper shell.

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