Converter and power supply system

Abstract

The application discloses a converter and a power supply system, and relates to the technical field of new energy power generation. The converter comprises a main power conversion board, which comprises a main control module, a signal acquisition module, an insulation detection module, a power drive module, a power module, a high-frequency support capacitor module and a low-frequency support capacitor module; a direct-current electromagnetic compatibility filter board, which is connected with the main power conversion board and used for connecting a direct-current side device; and an alternating-current electromagnetic compatibility filter board, which is connected with the main power conversion board and used for connecting an alternating-current power grid. The main function modules of the converter are integrated on one circuit board, so that the function modules on the main power conversion board do not need to be connected through a wire harness, automatic production is easier to realize, the manufacturing process of the converter is simplified, the manufacturing process requirement of the converter is reduced, and the reliability and consistency of mass production of the converter are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of new energy power generation, in particular to a converter and a power supply system. BACKGROUND

[0002] In a new type of power system based on new energy power generation technology, a converter is usually used to convert direct current of an energy storage battery into alternating current, or to convert alternating current of a power grid into direct current, so as to realize energy conversion between the energy storage battery and the power grid.

[0003] However, in the related art, multiple independent modules of the converter are stacked and installed, and electrical connection is made through a connection harness, so that the number of internal connections of the energy storage converter is large, the manufacturing process is required to be high, and automatic production is difficult to realize. Therefore, how to reduce the manufacturing process difficulty of the converter is a problem to be solved. CONTENT OF THE UTILITY MODEL

[0004] The main purpose of the present application is to provide a converter and a power supply system, which aims to solve the technical problem of how to reduce the manufacturing process difficulty of the converter.

[0005] To achieve the above-mentioned purpose, the present application provides a converter, which comprises:

[0006] A main power conversion board, comprising a main control module, a signal acquisition module, an insulation detection module, a power drive module, a power module, a high-frequency support capacitor module and a low-frequency support capacitor module;

[0007] A direct current electromagnetic compatibility filter board connected with the main power conversion board, used for connecting a direct current side device;

[0008] An alternating current electromagnetic compatibility filter board connected with the main power conversion board, used for connecting an alternating current power grid.

[0009] In an embodiment, the main power conversion board further comprises a grid-connected filter capacitor.

[0010] The converter further comprises:

[0011] A grid-connected inductance interface board, which is connected with the main power conversion board, the alternating current electromagnetic compatibility filter board, a grid-connected filter inductor and a shell of a grid-connected filter respectively, the grid-connected filter inductor is arranged in the shell, and the grid-connected filter inductor and the grid-connected filter capacitor constitute the grid-connected filter.

[0012] In an embodiment, the converter further comprises:

[0013] A direct current switch board connected with the direct current electromagnetic compatibility filter board and the main power conversion board respectively, used for controlling the direct current electromagnetic compatibility filter board and the main power conversion board to be connected or disconnected;

[0014] The AC switch board is connected with the AC electromagnetic compatibility filter board, and is used for controlling the connection or disconnection of the AC electromagnetic compatibility filter board and the AC power grid.

[0015] In an embodiment, the main power conversion board further comprises a switch driving module;

[0016] The switch driving module is connected with the DC switch board and the AC switch board respectively, and is used for controlling the on-off state of the DC switch board and the on-off state of the AC switch board.

[0017] In an embodiment, the main power conversion board comprises an analog signal area, a digital signal area, a high-voltage power area, a high-frequency support capacitor area and a low-frequency support capacitor area.

[0018] The grid-connected filter capacitor is arranged in the analog signal area.

[0019] The main control module, the signal acquisition module, the insulation detection module, the switch driving module and the power driving module are arranged in the digital signal area.

[0020] The power module is arranged in the high-voltage power area.

[0021] The high-frequency support capacitor module is arranged in the high-frequency support capacitor area.

[0022] The low-frequency support capacitor module is arranged in the low-frequency support capacitor area.

[0023] In an embodiment, the converter further comprises:

[0024] The DC power supply board is connected with the DC electromagnetic compatibility filter board and the main power conversion board respectively, and is used for converting the received input voltage into a power supply voltage to supply power to the main power conversion board.

[0025] In an embodiment, the converter further comprises:

[0026] The AC power supply board is connected with the AC power grid and the main power conversion board respectively, and is used for converting the received AC voltage into a power supply voltage to supply power to the main power conversion board.

[0027] In an embodiment, the functional boards of the converter are detachably connected.

[0028] In an embodiment, the grid-connected inductance interface board and the main power conversion board are connected through bolts.

[0029] On the other hand, the application further proposes a power supply system, which comprises:

[0030] At least one converter as described above.

[0031] The one or more technical solutions proposed by the application have at least the following technical effects:

[0032] The technical scheme of the application sets the main control module, the signal acquisition module, the insulation detection module, the power driving module, the power module, the high-frequency support capacitor module and the low-frequency support capacitor module of the converter on the main power conversion board, and connects external DC devices through the DC electromagnetic compatibility filter board and connects external AC power grid through the AC electromagnetic compatibility filter board, so that the main function modules of the converter are integrated on one circuit board, the function modules on the main power conversion board do not need to be connected through a wire harness, the automation production is easier to realize, the manufacturing process of the converter is simplified, the manufacturing process difficulty of the converter is reduced, the reliability and consistency of the mass production of the converter are improved, and the manufacturing cost of the converter is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical scheme in the embodiments of the application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0034] Figure 1 The structural schematic diagram of the first embodiment of the converter provided by the application is shown in the figure.

[0035] Figure 2 The structural schematic diagram of the second embodiment of the converter provided by the application is shown in the figure.

[0036] Figure 3 The connection schematic diagram of the grid-connected inductance interface board and the main power conversion board provided by the application is shown in the figure.

[0037] Figure 4 The partition schematic diagram of the main power conversion board provided by the application is shown in the figure.

[0038] Explanation of reference numerals:

[0039] 100, converter; 1, main power conversion board; 2, DC electromagnetic compatibility filter board; 3, AC electromagnetic compatibility filter board; 4, grid-connected inductance interface board; 5, DC power supply board; 6, DC switch board; 7, AC power supply board; 8, AC switch board; 9, external DC interface; 10, external AC interface; 11, grid-connected filter inductance; 12, welding port; 13, shell; 200, DC side device; 300, AC power grid.

[0040] A, analog signal area; B, digital signal area; C, high-voltage power area; D, high-frequency support capacitor area; E, low-frequency support capacitor area; F, insulation test area / switch driving area.

[0041] The objectives, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0043] It should be noted that, in the present application, the terms “comprising”, “containing” or any other variants thereof are intended to cover non-exclusive containing, so that the device or system comprising a series of elements not only includes those elements, but also includes other elements not explicitly listed, or includes elements inherent to such device or system. Without more limitations, the elements defined by the statement “comprising” do not exclude the presence of other identical elements in the device or system comprising the element.

[0044] In the present application, unless otherwise explicitly specified and limited, the terms “connection”, “fixing” and the like should be understood in a broad sense, for example, “connection” can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through an intermediate medium; can be internal communication of two elements or interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0045] In the present application, the suffix such as “module”, “component” or “module” used to represent elements is only for the convenience of the description of the present application, and has no specific meaning. Therefore, “module”, “component” or “module” can be used mixedly. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the fact that those skilled in the art can realize it, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the scope of protection claimed by the present application.

[0046] In order to solve the above technical problems, the present application provides a converter.

[0047] Please refer to Figure 1 The present application provides a converter, which can comprise:

[0048] The main power conversion board comprises a main control module, a signal acquisition module, an insulation detection module, a power drive module, a power module, a high-frequency support capacitor module and a low-frequency support capacitor module.

[0049] The direct-current electromagnetic compatibility filter board is connected with the main power conversion board and is used for connecting a direct-current side device.

[0050] The alternating-current electromagnetic compatibility filter board is connected with the main power conversion board and is used for connecting an alternating-current power grid.

[0051] It should be noted that the converter can be an energy storage converter in a new power system. The main power conversion board integrates the main control module, the signal acquisition module, the insulation detection module, the power drive module, the power module, the high-frequency support capacitor module and the low-frequency support capacitor module and the like in the converter, and is used for converting direct-current electricity of an energy storage battery into alternating-current electricity or converting alternating-current electricity of a power grid into direct-current electricity, so as to realize energy conversion between the energy storage battery and the power grid.

[0052] The direct-current side device can comprise an energy storage battery and a direct-current electromagnetic compatibility (EMC, Electro Magnetic Compatibility) filter board, which is used for connecting the energy storage battery and the main power conversion board and realizing a direct-current electromagnetic compatibility filtering function. The alternating-current electromagnetic compatibility filter board is used for connecting the alternating-current power grid and the main power conversion board and realizing an alternating-current electromagnetic compatibility filtering function.

[0053] In a feasible implementation, the converter can further comprise:

[0054] The external direct-current interface is used for connecting the direct-current electromagnetic compatibility filter board and the direct-current side device.

[0055] The external alternating-current interface is used for connecting the alternating-current electromagnetic compatibility filter board and the alternating-current power grid.

[0056] It should be noted that the converter can comprise a cabinet, as shown in Figure 2 One side of the cabinet of the converter can be provided with the external direct-current interface and the external alternating-current interface. The external direct-current interface is connected with the direct-current electromagnetic compatibility filter board in the cabinet, and the external alternating-current interface is connected with the alternating-current electromagnetic compatibility filter board.

[0057] In specific use, the external direct-current interface is used for connecting the direct-current side device, and the external alternating-current interface is used for connecting the alternating-current power grid.

[0058] In a feasible implementation, the converter can be detachably connected between the functional boards.

[0059] It should be noted that the detachable connection mode can comprise at least one of a copper bar connection, a bolt connection and a plug-in connection. Preferably, the direct-current electromagnetic compatibility filter board and the alternating-current electromagnetic compatibility filter board are connected with the main power conversion board through the copper bar connection.

[0060] In an embodiment, the main power conversion board can further comprise a grid-connected filter capacitor.

[0061] The converter can further comprise:

[0062] The grid-connected inductor interface board is connected with the main power conversion board, the AC electromagnetic compatibility filter board, the grid-connected filter inductor and the housing of the grid-connected filter respectively, the grid-connected filter inductor is arranged in the housing and connected with the grid-connected filter capacitor to form the grid-connected filter.

[0063] It should be noted that the AC side of the converter is further provided with a grid-connected filter to filter high-frequency harmonics, provide reactive power support, improve power factor and the like. The grid-connected filter can be an LC filter or an LCL filter. The grid-connected filter comprises a grid-connected filter capacitor and a grid-connected filter inductor. In the new power system, the grid-connected filter is a three-phase AC filter, that is, the converter comprises a three-phase grid-connected filter capacitor and a three-phase grid-connected filter inductor.

[0064] In the embodiment, one grid-connected inductor interface board is provided with one phase of grid-connected filter inductor. The grid-connected inductor interface board is fixedly connected with the grid-connected filter inductor, and the connection mode can include welding or bonding and the like. The grid-connected inductor interface board and the housing of the grid-connected filter inductor are detachably connected. As shown in Figure 3 The grid-connected inductor interface board and the housing of the grid-connected filter inductor are connected by bolts, the grid-connected filter inductor is fixed in the housing of the grid-connected filter inductor by glue pouring, and the pins of the grid-connected filter inductor are welded to the welding port of the grid-connected inductor interface board.

[0065] In an embodiment, the grid-connected inductor interface board and the main power conversion board are connected by bolts.

[0066] It can be understood that the grid-connected inductor interface board and the main power conversion board and the AC electromagnetic compatibility filter board are also detachably connected. Preferably, as shown in Figure 3 The grid-connected inductor interface board and the main power conversion board are connected by bolts, and the grid-connected inductor interface board and the AC electromagnetic compatibility filter board are connected by copper bars. Figure 2

[0067] In an embodiment, as shown in Figure 1 The converter can further comprise:

[0068] The DC switch board is connected with the DC electromagnetic compatibility filter board and the main power conversion board respectively, and is used to control the connection or disconnection of the DC electromagnetic compatibility filter board and the main power conversion board.

[0069] ​The AC switch board is connected with the AC electromagnetic compatibility filter board and is used for controlling the connection or disconnection of the AC electromagnetic compatibility filter board and the AC power grid.

[0070] It should be noted that the DC switch module and the AC switch module can also be arranged in the converter to control the on-off state between the converter and the DC side device and the AC power grid. As shown in Figure 2 The DC switch module and the AC switch module are independently arranged on the DC switch board and the AC switch board, respectively.

[0071] It can be understood that the DC switch board is also detachably connected with the DC electromagnetic compatibility filter board and the main power conversion board, and the AC switch board is also detachably connected with the AC electromagnetic compatibility filter board. As shown in Figure 2 The energy storage battery is connected from the external DC interface, passes through the DC electromagnetic compatibility filter board and the DC switch board, and is connected to the main power conversion board. The DC electromagnetic compatibility filter board and the DC switch board, and the DC switch board and the main power conversion board are connected through two groups of large-current copper bars. The AC power grid is connected from the external AC interface, passes through the DC switch board, the AC electromagnetic compatibility filter board and the three-phase grid-connected inductance interface board, and is connected to the main power conversion board. The AC switch board is connected to the AC electromagnetic compatibility filter board through three copper bars, and the three-phase grid-connected inductance interface board is connected to the AC electromagnetic compatibility filter board through three groups of copper bars.

[0072] In a possible implementation, the main power conversion board can further include a switch driving module.

[0073] The switch driving module is connected with the DC switch board and the AC switch board, respectively, and is used for controlling the on-off state of the DC switch board and the on-off state of the AC switch board.

[0074] It should be noted that the switch driving module is used for controlling the on-off state of the DC switch board and the on-off state of the AC switch board according to the received control signal. The control signal of the switch driving module is output from the main control module to the switch driving module, and therefore, the switch driving module can be integrated on the main power conversion board. The driving end of the AC switch and the driving end of the DC switch are connected with the switch driving module.

[0075] In a possible implementation, the main power conversion board includes an analog signal area, a digital signal area, a high-voltage power area, a high-frequency support capacitor area and a low-frequency support capacitor area.

[0076] The grid-connected filter capacitor module is arranged in the analog signal area.

[0077] The main control module, the signal acquisition module, the insulation detection module, the switch driving module and the power driving module are arranged in the digital signal area.

[0078] The power module is arranged in the high-voltage power area.

[0079] The high-frequency support capacitor module is located in the high-frequency support capacitor area;

[0080] The low-frequency support capacitor module is located in the low-frequency support capacitor area.

[0081] It should be noted that the signals of each functional module in the main power converter board include analog signals, control signals, high-current signals, and high-voltage signals. Therefore, the main power converter board can be partitioned according to different signal types, and corresponding functional modules can be set for each. For example... Figure 4 As shown, the top of the main power converter board is primarily an analog signal area, used to house the grid-connected filter capacitor module; the left side is the digital signal area, used to house the main control module, signal acquisition module, insulation detection module, switch drive module, and power drive module. Further, the digital signal area can also include an insulation test area and a switch drive area, used to house the insulation detection module and switch drive module, respectively; the upper right is the high-voltage power area, used to house the power module; the middle right is the high-frequency support capacitor area, used to house the high-frequency support capacitor module; and the lower right is the low-frequency support capacitor area, used to house the low-frequency support capacitor module. Thus, the left side of the main power converter board is the low-voltage control area, and the right side is the high-voltage power area, resulting in a partitioned layout for high and low voltage, and also for analog and digital signals. Furthermore, the high-frequency support capacitor area of ​​the main power converter board has a DC interface, and the high-voltage power area has an AC interface, ensuring that the power flow is from the lower left to the upper right when the converter is operating.

[0082] In one feasible implementation, the converter further includes:

[0083] The DC power supply board is connected to the DC electromagnetic compatibility filter board and the main power conversion board, respectively, and is used to convert the received input voltage into the supply voltage to power the main power conversion board.

[0084] It should be noted that the DC power supply board can draw power from the energy storage battery through the DC electromagnetic compatibility filter board, converting it to obtain the supply voltage, which serves as the control power supply for the main power converter board. The input voltage is the filtered battery voltage output from the DC electromagnetic compatibility filter board.

[0085] In one feasible implementation, the converter further includes:

[0086] The AC power supply board is connected to both the AC power grid and the main power conversion board. It is used to convert the received AC voltage into the power supply voltage to power the main power conversion board.

[0087] It should be noted that the AC power supply board can draw power from the AC grid through an external AC interface, convert it to obtain the supply voltage, and use it as the control power supply for the main power conversion board. The AC voltage is the output voltage of the AC grid.

[0088] Therefore, the embodiment provides a converter, wherein the main control module, the signal acquisition module, the insulation detection module, the power drive module, the power module, the high-frequency support capacitor module and the low-frequency support capacitor module of the converter are arranged on a main power conversion board, and are connected with external direct-current equipment through a direct-current electromagnetic compatibility filter board and connected with an external alternating-current power grid through an alternating-current electromagnetic compatibility filter board, so that the main functional modules of the converter are integrated on one circuit board, the functional modules on the main power conversion board do not need to be connected through a wire harness, the automation production is easier to realize, the manufacturing process of the converter is simplified, the manufacturing process difficulty of the converter is reduced, the reliability and consistency of the mass production of the converter are improved, and the manufacturing cost of the converter is reduced.

[0089] In addition, the embodiment integrates the functional modules of the converter on different circuit boards, and the circuit boards are directly connected through copper bars or bolts, so that various signals of the converter are carried through the circuit boards or the copper bars, and the anti-interference performance of the signals is better compared with carrying the signals through a wire harness, and the electromagnetic compatibility performance of the converter is improved.

[0090] In addition, the embodiment further provides a power supply system, and the power supply system can include:

[0091] At least one converter as described above.

[0092] It should be noted that the specific structure of the converter is referred to the above embodiments, and since the converter adopts all the technical solutions of the above embodiments, at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0093] The above only describes the exemplary embodiments of the application, and does not limit the patent scope of the application, and any equivalent structural transformation made by using the content of the application specification and drawings, or directly / indirectly applied in other related technical fields is included in the patent protection scope of the application.

Claims

1. A current transformer, characterized by The converter comprises: a main power conversion board comprising a main control module, a signal acquisition module, an insulation detection module, a power drive module, a power module, a high-frequency support capacitor module and a low-frequency support capacitor module; a direct-current electromagnetic compatibility filter board connected with the main power conversion board and used for connecting a direct-current side device; an alternating-current electromagnetic compatibility filter board connected with the main power conversion board and used for connecting an alternating-current power grid.

2. The converter of claim 1, wherein the main power conversion board further comprises a grid-connected filter capacitor; the converter further comprises: a grid-connected inductor interface board connected with the main power conversion board, the alternating-current electromagnetic compatibility filter board, a grid-connected filter inductor and a shell of the grid-connected filter inductor, the grid-connected filter inductor being arranged in the shell and the grid-connected filter inductor and the grid-connected filter capacitor constituting a grid-connected filter.

3. The current transformer of claim 2, wherein, the converter further comprises: a direct-current switch board connected with the direct-current electromagnetic compatibility filter board and the main power conversion board respectively and used for controlling the direct-current electromagnetic compatibility filter board and the main power conversion board to be connected or disconnected; an alternating-current switch board connected with the alternating-current electromagnetic compatibility filter board and used for controlling the alternating-current electromagnetic compatibility filter board and the alternating-current power grid to be connected or disconnected.

4. The current transformer of claim 3, wherein, the main power conversion board further comprises a switch drive module; the switch drive module is connected with the direct-current switch board and the alternating-current switch board respectively and used for controlling on-off states of the direct-current switch board and the alternating-current switch board.

5. The current transformer of claim 4, wherein, the main power conversion board comprises an analog signal area, a digital signal area, a high-voltage power area, a high-frequency support capacitor area and a low-frequency support capacitor area; the grid-connected filter capacitor is arranged in the analog signal area; the main control module, the signal acquisition module, the insulation detection module, the switch drive module and the power drive module are arranged in the digital signal area; the power module is arranged in the high-voltage power area; the high-frequency support capacitor module is arranged in the high-frequency support capacitor area; the low-frequency support capacitor module is arranged in the low-frequency support capacitor area.

6. The current transformer of claim 1, wherein, the converter further comprises: a direct-current power supply board connected with the direct-current electromagnetic compatibility filter board and the main power conversion board respectively and used for converting an input voltage received into a power supply voltage to supply power to the main power conversion board.

7. The current transformer of claim 1, wherein, the converter further comprises: an alternating-current power supply board connected with the alternating-current power grid and the main power conversion board respectively and used for converting an alternating-current voltage received into a power supply voltage to supply power to the main power conversion board.

8. A current transformer as claimed in any one of claims 1 to 7, characterised in that, The functional boards of the converter are detachably connected.

9. The current transformer of claim 2, wherein, The grid-connected inductor interface board and the main power conversion board are connected through bolts.

10. A power supply system characterized by comprising: the power supply system comprises: at least one converter as claimed in any one of claims 1 to 9.

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