Direct-current bus voltage stabilizer equipment

Abstract

The invention relates to the field of voltage stabilization, in particular to direct-current bus voltage stabilization device equipment, which comprises a bottom plate seat, a chopping cabinet unit and an energy-consuming resistor cabinet unit, and is characterized in that the bottom plate seat is divided into two independent areas, and the chopping cabinet unit and the energy-consuming resistor cabinet unit are respectively arranged in the two independent areas; a main loop adopts a topological structure in which multiple branch chopper circuits are connected in series and energy-consuming resistors are connected in series in groups, and excess energy of a direct-current bus is consumed through a chopper cabinet unit and an energy-consuming resistor cabinet unit so as to keep the voltage of the direct-current bus stable; the chopper cabinet unit adopts a self-heat dissipation mode, the energy-consuming resistor cabinet unit adopts forced air cooling heat dissipation, a heat dissipation fan is arranged on a bottom plate seat at the bottom end of the energy-consuming resistor cabinet unit, an independent heat dissipation air channel is formed by a resistor cabinet, heat is directly discharged from the top of the cabinet, and the problem that a large amount of heat generated by an energy-consuming resistor in the process of consuming excess energy of a direct-current bus is difficult to dissipate is solved. And a middle maintenance channel is reserved on the bottom plate seat, so that the chopper cabinet unit and the energy consumption resistor cabinet unit are convenient to overhaul and maintain.

Description

Technical Field

[0001] The present invention relates to the field of voltage stabilizing equipment, and in particular to a DC bus voltage stabilizing device. Background Art

[0002] Green hydrogen is generated by renewable energy (mainly wind and solar), and then the DC power is obtained, and the water molecules are decomposed into hydrogen and oxygen by electrochemical process, which are precipitated at the cathode and anode respectively. In order to reduce the impact and disturbance of new energy wind and solar hydrogen production projects on the existing power grid, more projects will adopt pure off-grid hydrogen production in the future; when hydrogen is produced in pure off-grid mode, due to the lack of large power grid support, when the energy emitted by the source side suddenly exceeds the load absorption capacity, the DC bus voltage will exceed the upper limit value, and there is no redundant equipment to absorb it. The DC bus voltage exceeds the allowable working range, which is easy to cause equipment damage; in order to ensure that the DC bus voltage is within the allowable working range, the chopping function of the DC bus voltage stabilizer is usually enabled, and the DC bus energy is consumed by resistors to maintain the stability of the DC bus voltage. In the existing DC bus voltage stabilizer, there are many chopping and resistance consumption branches, and the source side is basically outdoors. Usually, the chopping cabinet and the resistance cabinet are separated in two places, which is inconvenient for inspection and maintenance, and the degree of integration needs to be improved. Summary of the invention

[0003] The present invention provides a DC bus voltage stabilizing device, which can absorb the energy on the source side that suddenly exceeds the energy on the absorption side, maintain the DC bus voltage stable, and has a design of a self-cooling mode of a chopper rail unit + a forced air cooling mode of an energy-consuming resistor cabinet unit, which has a good heat dissipation effect and meets the heat dissipation requirements, as well as an integrated arrangement mode of matching choppers and energy-consuming resistors, which is convenient for inspection and maintenance.

[0004] The present invention provides a DC bus voltage stabilizing device, comprising: a base plate, a chopper cabinet unit and an energy-consuming resistor cabinet unit, wherein an intermediate maintenance channel is provided on the base plate; The chopper cabinet unit includes a chopper control single cabinet, a chopper incoming line single cabinet and multiple chopper branch single cabinets; the single cabinets in the chopper cabinet unit are divided into two rows and arranged on one side of the base plate, and are relatively located on both sides of the middle maintenance channel; the energy-consuming resistor cabinet unit includes multiple energy-consuming resistor single cabinets, and the multiple energy-consuming resistor single cabinets are divided into two rows and arranged on the other side of the base plate, and are relatively located on both sides of the middle maintenance channel; a cooling fan is also provided on the installation position of the energy-consuming resistor single cabinet on the base plate to dissipate heat of the energy-consuming resistor single cabinet.

[0005] Furthermore, a control room component is provided in the chopper control single cabinet; a first controller, two power modules and eight voltage-equalizing resistors are installed in the chopper incoming line single cabinet.

[0006] Furthermore, a second controller and four power modules are provided in the chopper branch single cabinet.

[0007] Furthermore, the controller and the power module are supported by insulating beams and arranged in the cabinet.

[0008] Furthermore, the power module has a built-in power module, a fin-type heat sink is provided on the power module, and heat dissipation holes are provided on the installation bottom plate, side plate and top plate of the power module.

[0009] Furthermore, the energy-absorbing resistor single cabinet has a vertical heat dissipation channel, in which an energy-absorbing resistor module is arranged. The bottom end of the heat dissipation channel is connected to the heat dissipation fan as the air inlet end; the top end of the heat dissipation channel is open as the air outlet end; the energy-absorbing resistor module includes two IGBT energy-absorbing resistors, and the two upper BANKs form a group of resistors, and the two lower BANKs form a group of resistors.

[0010] Furthermore, in a single energy-dissipating resistor cabinet, two IGBT energy-dissipating resistors are connected to the cabinet body through an insulating seat and an insulating beam.

[0011] Furthermore, an isolation door is provided between the chopper cabinet unit and the energy dissipation resistor cabinet unit on the base plate.

[0012] The above technical solution of the present invention has the following advantages: The DC bus voltage stabilizing device of the present application comprises: a base plate, a chopper cabinet unit and an energy-consuming resistor cabinet unit, wherein an intermediate maintenance channel is arranged on the base plate; the base plate is divided into two independent areas, in which the chopper cabinet unit and the energy-consuming resistor cabinet unit are arranged respectively; the main circuit adopts a topological structure in which a multi-branch chopper circuit is connected in series and energy-consuming resistors are connected in groups in series, and the chopper cabinet unit and the energy-consuming resistor cabinet unit are used to consume the excess energy of the DC bus to maintain the stability of the DC bus voltage; the chopper cabinet unit adopts a self-heating mode, and the energy-consuming resistor cabinet unit adopts forced air cooling to dissipate heat; a heat dissipation fan is arranged on the base plate at the bottom end of the energy-consuming resistor cabinet unit, and the resistor cabinet forms an independent heat dissipation air duct, which is directly discharged from the top of the cabinet, so as to solve the problem that a large amount of heat generated by the energy-consuming resistor in the process of consuming the excess energy of the DC bus is difficult to dissipate; in addition, an intermediate maintenance channel is reserved on the base plate to facilitate the inspection and maintenance of the chopper cabinet unit and the energy-consuming resistor cabinet unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 This is a structural schematic diagram of a DC bus voltage stabilizing device according to this embodiment; Figure 2 for Figure 1The schematic diagram of the structure of the chopper control cabinet and the chopper incoming line cabinet in the chopper cabinet unit; Figure 3 for Figure 1 The schematic diagram of the structure of the chopper branch single cabinet in the chopper cabinet unit; Figure 4 for Figure 1 The schematic diagram of the structure of the energy-consuming resistor single cabinet in the energy-consuming resistor cabinet unit; DETAILED DESCRIPTION

[0015] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0016] It should be noted that when an element is referred to as being "fixed on" or "set on" another element, it can be directly on the other element or indirectly set on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0017] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0018] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" and "several" mean two or more, unless otherwise clearly and specifically defined.

[0019] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the effects and purposes that can be achieved by this application.

[0020] See also Figures 1 to 4 , the present invention provides a DC bus voltage stabilizing device, comprising: a base plate, a chopper cabinet unit and an energy dissipation resistor cabinet unit, wherein an intermediate maintenance channel is provided on the base plate; The chopper cabinet unit includes a chopper control single cabinet, a chopper incoming line single cabinet and multiple chopper branch single cabinets; the single cabinets in the chopper cabinet unit are divided into two rows and arranged on one side of the base plate, and are relatively located on both sides of the middle maintenance channel; the energy-consuming resistor cabinet unit includes multiple energy-consuming resistor single cabinets, and the multiple energy-consuming resistor single cabinets are divided into two rows and arranged on the other side of the base plate, and are relatively located on both sides of the middle maintenance channel; a cooling fan is also provided on the installation position of the energy-consuming resistor single cabinet on the base plate to dissipate heat of the energy-consuming resistor single cabinet.

[0021] In the above scheme, the base plate is divided into two independent areas, in which the chopper cabinet unit and the energy-consuming resistor cabinet unit are arranged respectively; the main circuit adopts a topological structure in which multiple branch chopper circuits are connected in series and energy-consuming resistors are connected in groups in series, and the chopper cabinet unit and the energy-consuming resistor cabinet unit are used to consume the excess energy of the DC bus to maintain the stability of the DC bus voltage; the chopper cabinet unit adopts a self-heating mode, and the energy-consuming resistor cabinet unit adopts forced air cooling. A cooling fan is arranged on the base plate at the bottom end of the energy-consuming resistor cabinet unit, and the resistor cabinet forms an independent heat dissipation duct, which is directly discharged from the top of the cabinet, so as to solve the problem that the energy-consuming resistor generates a large amount of heat in the process of consuming the excess energy of the DC bus and is difficult to dissipate; in addition, an intermediate maintenance channel is reserved on the base plate to facilitate the inspection and maintenance of the chopper cabinet unit and the energy-consuming resistor cabinet unit.

[0022] Furthermore, a control room component is provided in the chopper control single cabinet; a first controller, two power modules and eight voltage-equalizing resistors are installed in the chopper incoming line single cabinet.

[0023] Furthermore, a second controller and four power modules are provided in the chopper branch single cabinet.

[0024] Furthermore, the controller and the power module are supported by insulating beams and arranged in the cabinet.

[0025] Furthermore, the power module has a built-in power module, a finned heat sink is provided on the power module, and heat dissipation holes are provided on the installation bottom plate, side plate, and top plate of the power module. The power module dissipates heat naturally through the finned heat sink, and heat dissipation holes are provided on the installation bottom plate, side plate, and top plate of the power module, so that the heat generated by the power module inside the module can be released through the heat dissipation holes.

[0026] Furthermore, the energy-absorbing resistor single cabinet has a vertical heat dissipation channel, in which an energy-absorbing resistor module is arranged. The bottom end of the heat dissipation channel is connected to the heat dissipation fan as the air inlet end; the top end of the heat dissipation channel is open as the air outlet end; the energy-absorbing resistor module includes two IGBT energy-absorbing resistors, and the two upper BANKs form a group of resistors, and the two lower BANKs form a group of resistors.

[0027] In the pure off-grid hydrogen production mode, due to the lack of large power grid support, the voltage stabilizing device of the present application, with the help of the chopping function of the chopper cabinet unit, and the energy-consuming resistor in the energy-consuming resistor cabinet unit consumes the energy that suddenly exceeds the energy on the source side through the energy-consuming resistor, so as to maintain the stability of the DC bus voltage; the chopper cabinet unit uses a heat sink with fins to dissipate the heat of the power module, and at the same time, the bottom plate, side plate and top plate installed in the power module are all opened with heat dissipation holes, so that the heat generated by the power module inside the module can be released through the heat dissipation holes; the energy-consuming resistor cabinet unit adopts a forced air cooling mode, and a cooling fan is installed on the bottom plate seat at the bottom of the cabinet, and the cabinet forms an independent air duct, which is directly discharged from the top of the cabinet; the design of the self-cooling + forced air cooling mode meets the heat dissipation requirements, and matches the integrated layout of the chopper and energy-consuming resistor, which is convenient for inspection and maintenance.

[0028] Furthermore, in a single energy-dissipating resistor cabinet, two IGBT energy-dissipating resistors are connected to the cabinet body through an insulating seat and an insulating beam.

[0029] Furthermore, an isolation door is provided between the chopper cabinet unit and the energy dissipation resistor cabinet unit on the base plate.

[0030] It should be noted that Figure 1 The component structure design of the DC bus voltage stabilizing device shown includes: 1. chopper cabinet unit, 2. energy-consuming resistor cabinet unit, 3. isolation cabin door, 4. base plate, 101. chopper control single cabinet, 102. chopper incoming line single cabinet, 103. chopper branch single cabinet.

[0031] Figure 2 The component structure design in the chopper control single cabinet and the chopper incoming line single cabinet shown includes: 1. control room components, 2. first controller, 3. power module, 4. voltage balancing resistor.

[0032] Figure 3 The component structure design in the chopper branch single cabinet shown includes: 1. power module, 2. second controller, 3. insulating beam.

[0033] Figure 4 The component structure design in the energy dissipation resistor single cabinet shown includes: 1. energy dissipation resistor, 2. insulation seat, 3. cooling fan.

[0034] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A DC bus voltage stabilizing device, characterized in that: include: The base plate, chopper cabinet unit and energy dissipation resistor cabinet unit are provided with an intermediate maintenance passage on the base plate; The chopper cabinet unit includes a chopper control single cabinet, a chopper incoming line single cabinet and multiple chopper branch single cabinets; the single cabinets in the chopper cabinet unit are divided into two rows and arranged on one side of the base plate, and are relatively located on both sides of the middle maintenance channel; the energy-consuming resistor cabinet unit includes multiple energy-consuming resistor single cabinets, and the multiple energy-consuming resistor single cabinets are divided into two rows and arranged on the other side of the base plate, and are relatively located on both sides of the middle maintenance channel; a cooling fan is also provided on the installation position of the energy-consuming resistor single cabinet on the base plate to dissipate heat of the energy-consuming resistor single cabinet.

2. The DC bus voltage stabilizing device according to claim 1, characterized in that: The chopper control cabinet is equipped with control room components; the chopper incoming line cabinet is equipped with a first controller, two power modules and eight voltage-equalizing resistors.

3. The DC bus voltage stabilizing device according to claim 2, characterized in that: The chopper branch single cabinet is equipped with a second controller and four power modules.

4. The DC bus voltage stabilizing device according to claim 3, characterized in that: The controller and the power module are supported by insulating beams and arranged in the cabinet.

5. The DC bus voltage stabilizing device according to claim 3, characterized in that: The power module has a built-in power module, a fin-type heat sink is arranged on the power module, and heat dissipation holes are opened on the installation bottom plate, side plate and top plate of the power module.

6. The DC bus voltage stabilizing device according to any one of claims 1 to 5, characterized in that: The energy-absorbing resistor single cabinet has a vertical heat dissipation channel, in which an energy-absorbing resistor module is arranged. The bottom of the heat dissipation channel is connected to the heat dissipation fan as the air inlet end; the top of the heat dissipation channel is open as the air outlet end; the energy-absorbing resistor module includes two IGBT energy-absorbing resistors, and the two upper BANKs form a group of resistors, and the two lower BANKs form a group of resistors.

7. The DC bus voltage stabilizing device according to claim 6, characterized in that: In a single energy-dissipating resistor cabinet, two IGBT energy-dissipating resistors are connected to the cabinet body by an insulating seat and an insulating beam.

8. The DC bus voltage stabilizing device according to any one of claims 1 to 5 and 7, characterized in that: An isolation door is arranged between the chopper cabinet unit and the energy dissipation resistor cabinet unit on the bottom plate seat.

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