High-power inversion and rectification integrated unit based on flywheel energy storage system

Abstract

According to the high-power inversion and rectification integrated unit based on the flywheel energy storage system provided by the utility model, the power unit A and the power unit B can be used for sharing a double-output capacitor module, so that the reliability of the whole unit is improved, and the installation distance between power devices is reduced, therefore, the power density of the whole unit is improved, and the service life of the whole unit is prolonged. The overall structure is compact and orderly, the layout is reasonable, the overall performance is improved, and the space is saved. The high-power inversion and rectification integrated unit has a wide application prospect in a flywheel energy storage system, and can improve the energy utilization efficiency, reduce the energy loss, and improve the stability of power supply and the reliability of a power system.

Description

Technical Field

[0001] The utility model relates to a flywheel energy storage system, in particular to a high-power inverter and rectifier integrated unit based on the flywheel energy storage system. Background Art

[0002] As energy crisis and environmental problems become increasingly serious, energy storage technology is increasingly widely used in new energy, smart grid and other fields. Energy storage and release in energy storage systems are achieved through the process of rectification and inversion. However, in traditional energy storage systems, rectification and inversion functions are usually implemented by two independent units, which not only increases the complexity and cost of the system, but also increases the volume and weight of the system. Therefore, how to achieve the integrated design of rectification unit and inverter unit and improve the efficiency and reliability of energy storage system has become an important research direction in the energy storage industry. Utility Model Content

[0003] The utility model provides a high-power inverter and rectifier integrated unit based on a flywheel energy storage system, which solves the problem of integrated design of rectifier unit and inverter unit applied to the same flywheel energy storage system. The technical solution is as follows:

[0004] A high-power integrated inverter and rectifier unit based on a flywheel energy storage system comprises a sheet metal component, an air duct unit is arranged inside the sheet metal component, a control unit is arranged on the left side, a shared dual-output capacitor module is arranged on the front and rear sides, and a first power unit and a second power unit connected to the shared dual-output capacitor module are also arranged, the first power unit and the second power unit both comprise an AC input interface, a power IGBT module and a capacitor busbar connected in sequence, and the capacitor busbar is connected to the shared dual-output capacitor module.

[0005] The shared dual-output capacitor module is connected in series and parallel via the capacitor busbar of the first power unit and the capacitor busbar of the second power unit.

[0006] The air duct unit comprises a fan unit and a radiator. The fan unit is installed on the left side of the sheet metal component, and the radiator is located inside the sheet metal component.

[0007] The control unit includes a control drive board and an IGBT adapter board connected to each other. The control drive board is used to connect to a host computer, and the IGBT adapter board is used to install power IGBT modules of the first power unit and the second power unit.

[0008] The sheet metal component includes a first capacitor fixing plate and a second capacitor fixing plate arranged front and back, and the first capacitor fixing plate and the second capacitor fixing plate are used for installing a capacitor component that shares a dual-output capacitor module.

[0009] An electrical support plate and a protective support plate are provided on the left side of the sheet metal assembly. The electrical support plate is used for installing the control unit, and the protective support plate is located on the outside of the electrical support plate and is used to protect the control unit. A fan fixing plate is also provided on the left side of the sheet metal assembly for installing the fan group of the air duct unit.

[0010] A radiator fixing plate is provided between the first capacitor fixing plate and the second capacitor fixing plate, and is used for installing the radiator of the air duct unit.

[0011] The sheet metal assembly includes a cross-shaped bracket on the outside of the radiator fixing plate, which is used to install an insulating member, and the insulating member is used to fix the capacitor busbars of the first power unit and the second power unit.

[0012] An air outlet mesh plate is arranged on the right side of the sheet metal component to prevent debris from falling into the air duct unit.

[0013] The first power unit adopts a PWM rectifier, and the second power unit adopts an SPWM inverter.

[0014] The high-power inverter and rectifier integrated unit based on the flywheel energy storage system can reach a power of 1.4MW. The overall structure adopts the design of A power unit and B power unit sharing a dual-output capacitor module, which improves the reliability of the entire unit while reducing the installation distance between power devices, thereby improving the power density of the entire high-power inverter and rectifier unit. The overall compactness and order, reasonable layout, not only improve the overall performance, but also save space. A power unit and B power unit can be rectified or inverted at the same time, or can be controlled separately, rectifying while inverting, reducing maintenance costs. The utility model can realize the rectification and inversion functions, has the characteristics of high efficiency, high reliability, low loss, etc., and can be widely used in various energy storage systems, such as battery energy storage systems, supercapacitor energy storage systems, flywheel energy storage systems, etc. By applying the power unit provided by the utility model to the energy storage system, the efficiency, reliability and stability of the energy storage system can be improved, the cost and volume of the system can be reduced, and it has important application value and broad market prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a structural schematic diagram of the high-power inverter and rectifier integrated unit based on the flywheel energy storage system;

[0016] Figure 2 is a schematic diagram of power unit A;

[0017] Figure 3 is a schematic diagram of the B power unit;

[0018] Figure 4 This is a schematic diagram of a dual-output capacitor module;

[0019] Figure 5 is a schematic diagram of the air duct unit;

[0020] Figure 6 It is a schematic diagram of the structure of the sheet metal component;

[0021] Figure 7 This is a front view of the sheet metal assembly mounting the A power unit;

[0022] Figure 8 This is a schematic diagram of the back of the sheet metal assembly installed with the B power unit;

[0023] Fig. 9 It is the right schematic diagram of the sheet metal component. DETAILED DESCRIPTION

[0024] like Figure 1 As shown, the high-power inverter and rectifier integrated unit based on the flywheel energy storage system includes a sheet metal component, an air duct unit 4 is arranged inside the sheet metal component, a control unit 3 is arranged on the left side, a shared dual-output capacitor module 5 is arranged on the front and back sides, and an A power unit 1 and a B power unit 2 connected to the shared dual-output capacitor module 5 are also arranged. Figure 2 and Figure 3 As shown, the A power unit 1 is located in front of the sheet metal component, and the B power unit 2 is located behind the sheet metal component. Further, the A power unit 1 and the B power unit 2 both include an AC input interface, a power IGBT module and a capacitor busbar connected in sequence, and the capacitor busbar is connected to a shared dual-output capacitor module 5, wherein the A power unit 1 is used to realize a rectification function, and the B power unit 2 is used to realize an inversion function.

[0025] Combination Figure 4 As shown, both the A power unit 1 and the B power unit 2 can use a shared dual-output capacitor module 5, thereby reducing the loop loss between the power units. The shared dual-output capacitor module 5 is connected in series and parallel through the capacitor busbar of the A power unit 1 and the capacitor busbar of the B power unit 2, which can provide a stable bus voltage requirement during AC / DC conversion, and improve the capacitor voltage level by connecting in series. The capacitors after series connection are then connected in parallel to achieve the capacitance requirement. The series and parallel connection of the capacitors is achieved through the busbar design to achieve the series and parallel connection of the capacitors. The shared dual-output capacitor module 5 can enable the A power unit 1 and the B power unit 2 to share the same capacitor module, thereby reducing losses and reducing the volume.

[0026] When applied to the PCS (power storage converter, English translation: Power Conversion System) device of the flywheel energy storage system, a power conversion output of 1.4MW can be achieved through the two units of A power unit 1 and B power unit 2. The A power unit 1 and the B power unit 2 are arranged relatively to each other and can share the air duct unit 4 therebetween. The shared air duct unit 4 can reduce the thickness of the utility model.

[0027] Combination Figure 5 As shown, the air duct unit 4 includes a fan group and a radiator. The fan group is installed on the left side of the sheet metal component, using a set of adjustable speed, silent axial flow fans. The wind quickly passes through the radiator to take away the heat of the power device to ensure stable operation; the radiator is located inside the sheet metal component, and the heat dissipation requirements of the utility model during operation are met through the air duct unit 4. The control unit 3 includes a connected control drive board and an IGBT adapter board. The control drive board is used to connect to the host computer, and the IGBT adapter board is used to install the power IGBT module, so as to complete the execution requirements of the host computer for the A power unit 1 and the B power unit 2, and control the A power unit 1 and the B power unit 2 to respectively realize the rectification and inversion functions.

[0028] In the utility model, the synchronous control of the A power unit 1 and the B power unit 2 can be realized, and the separate control can also be used to meet various occasions and working conditions, and has the following three working modes:

[0029] (1) Working mode 1: high-power rectification, power unit A 1 AC input, DC output; (2) Working mode 2: high-power inversion, power unit B 2 DC input, AC output; (3) Working mode 3: rectification and inversion are performed simultaneously, power unit A 1 AC input, DC output; power unit B 2 DC input, AC output. Furthermore, in the above three working modes, the control unit 3 can realize the output power of power unit A 1 and power unit B 2 by controlling the pulse signal.

[0030] like Figures 6 to 9As shown, the sheet metal assembly includes a first capacitor fixing plate 11, a second capacitor fixing plate 18, an electrical support plate 12, a protective support plate 13, a radiator fixing plate 14, a "" bracket 15, an air outlet mesh plate 16, a fan fixing plate 17, and a second capacitor fixing plate 18. The first capacitor fixing plate 11 and the second capacitor fixing plate 18 are arranged front and back, and are used to install the capacitor assembly of the shared dual-output capacitor module 5. The electrical support plate 12 and the protective support plate 13 are located on the left side of the sheet metal assembly, and the electrical support plate 12 is used to install the control unit 3. The protective support plate 13 is located on the outside of the electrical support plate 12 to protect the control unit 3. The radiator fixing plate 14 is located between the first capacitor fixing plate 11 and the second capacitor fixing plate 18, and is used to install the radiator of the air duct unit 4. The "" bracket 15 is located on the outside of the radiator fixing plate 14, and is used to install the insulating member, and the insulating member is used to fix the capacitor copper bar of the A power unit 1 and the B power unit 2. The air outlet mesh plate 16 is located on the right side of the sheet metal assembly to prevent debris from falling into the air duct unit 4. The fan fixing plate 17 is located on the left side of the sheet metal component and is used to install the fan group of the air duct unit 4.

[0031] When the utility model is used, the A power unit 1 can be implemented by a PWM rectifier, which has the characteristics of high efficiency and low harmonic pollution, and can effectively convert the input AC power into smooth DC power; the B power unit 2 can be implemented by an SPWM inverter, which can convert DC power into AC power output, and can also realize multiple modes of operation to meet different load requirements. The control unit 3 is used to control the working state of the A power unit and the B power unit, and accurately control the rectifier unit and the inverter unit according to the system operation state and the preset control strategy to ensure the stability and reliability of the system. The air duct system 4 is implemented by natural convection or forced convection, etc., and is used to dissipate the heat generated during the operation of the two power units to ensure the stability and reliability of the system. The shared dual-output capacitor module 5 is used to store energy and stabilize voltage, and a bidirectional external terminal is used to improve the conversion rate.

[0032] Compared with traditional energy storage systems, the AC / DC power conversion optimization unit of the utility model realizes the integrated design of rectification and inversion, which significantly improves the integration and efficiency of the system. In addition, by adopting the above-mentioned advanced technology and unitized design, the complexity, cost and volume of the system are greatly reduced. At the same time, due to higher reliability, stability and energy conversion efficiency, the unit of the utility model can be widely used in energy storage systems in various harsh environments, and has the following advantages:

[0033] 1. The integrated design of rectification and inversion is realized, which improves the integration and efficiency of the system;

[0034] 2. Reduce the complexity and cost of the system, and reduce the volume and weight of the system;

[0035] 3. It has higher reliability and stability and can be used in various harsh environments;

[0036] 4. It has higher energy conversion efficiency and reduces energy loss.

Claims

1. A high-power inverter and rectifier integrated unit based on a flywheel energy storage system, characterized in that: It includes a sheet metal component, wherein a duct unit is arranged inside the sheet metal component, a control unit is arranged on the left side, a shared dual-output capacitor module is arranged on the front and rear sides, and a first power unit and a second power unit connected to the shared dual-output capacitor module are also arranged, and the first power unit and the second power unit both include an AC input interface, a power IGBT module and a capacitor busbar connected in sequence, and the capacitor busbar is connected to the shared dual-output capacitor module.

2. The high-power inverter and rectifier integrated unit based on the flywheel energy storage system according to claim 1 is characterized in that: The shared dual-output capacitor module is connected in series and parallel via the capacitor busbar of the first power unit and the capacitor busbar of the second power unit.

3. The high-power inverter and rectifier integrated unit based on the flywheel energy storage system according to claim 1, characterized in that: The air duct unit comprises a fan unit and a radiator. The fan unit is installed on the left side of the sheet metal component, and the radiator is located inside the sheet metal component.

4. The high-power inverter and rectifier integrated unit based on the flywheel energy storage system according to claim 1, characterized in that: The control unit includes a control drive board and an IGBT adapter board connected to each other. The control drive board is used to connect to a host computer, and the IGBT adapter board is used to install power IGBT modules of the first power unit and the second power unit.

5. The high-power inverter and rectifier integrated unit based on the flywheel energy storage system according to claim 1, characterized in that: The sheet metal component includes a first capacitor fixing plate and a second capacitor fixing plate arranged front and back, and the first capacitor fixing plate and the second capacitor fixing plate are used for installing a capacitor component that shares a dual-output capacitor module.

6. The high-power inverter and rectifier integrated unit based on the flywheel energy storage system according to claim 1, characterized in that: An electrical support plate and a protective support plate are provided on the left side of the sheet metal assembly. The electrical support plate is used for installing the control unit, and the protective support plate is located on the outside of the electrical support plate and is used to protect the control unit. A fan fixing plate is also provided on the left side of the sheet metal assembly for installing the fan group of the air duct unit.

7. The high-power inverter and rectifier integrated unit based on the flywheel energy storage system according to claim 5, characterized in that: A radiator fixing plate is provided between the first capacitor fixing plate and the second capacitor fixing plate, and is used for installing the radiator of the air duct unit.

8. The high-power inverter and rectifier integrated unit based on the flywheel energy storage system according to claim 1, characterized in that: The sheet metal assembly includes a cross-shaped bracket on the outside of the radiator fixing plate, which is used to install an insulating member, and the insulating member is used to fix the capacitor busbars of the first power unit and the second power unit.

9. The high-power inverter and rectifier integrated unit based on the flywheel energy storage system according to claim 1, characterized in that: An air outlet mesh plate is arranged on the right side of the sheet metal component to prevent debris from falling into the air duct unit.

10. The high-power integrated inverter and rectifier unit based on the flywheel energy storage system according to claim 1, characterized in that: The first power unit adopts a PWM rectifier, and the second power unit adopts an SPWM inverter.

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