Power supply system based on solid-state transformer

Abstract

The utility model discloses a power supply system based on a solid-state transformer, which comprises the solid-state transformer and a load, the input end of the solid-state transformer is electrically connected to the alternating current output end of a transformer substation through a medium-voltage alternating current bus, and the output end of the solid-state transformer is electrically connected with the load through a direct current bus. The direct current bus is electrically connected with the load to form a production line, and a plurality of production lines run in parallel; the power between the solid-state transformer and the production lines flows bidirectionally, and the power between the multiple production lines flows bidirectionally. Based on the characteristics of the solid-state transformer, the power supply system provided by the utility model can provide a simpler power supply system for the existing photovoltaic slice manufacturing industry, thereby achieving the purposes of shortening the construction period, reducing the wiring cost and improving the comprehensive operation efficiency of the overall architecture.

Description

Technical Field

[0001] This utility model relates to the field of power supply systems, and in particular to a power supply system based on a solid-state transformer. Background Technology

[0002] A typical example of a 100' power supply system used in the existing photovoltaic wafer manufacturing industry is... Figure 1 As shown, it mainly includes a transformer 10', a medium-voltage transformer 20', an active power supply 30', a load 40', a capacitor module 60', and a filter device 70'. The transformer 10' is located in substation A; the medium-voltage transformer 20' and the filter device 70' are located in the factory's power distribution room B; the active power supply 30', the load 40', and the capacitor module 60' are located in the factory production line C. Furthermore, the active power supply 30' and the medium-voltage transformer 20' are connected via a low-voltage AC wiring 23', and the capacitor module 60' is used at the end of the structure for instantaneous voltage balancing.

[0003] However, the existing power supply system has the following problems:

[0004] 1. The architecture is complex, requiring not only medium-voltage transformers, filtering devices, and active power supplies, but also capacitor modules at the end, resulting in low overall operating efficiency.

[0005] 2. The low-voltage wiring path is complex. Each production line requires a complete set of low-voltage AC wiring. The low-voltage current is large and the wire diameter is thick, resulting in high costs.

[0006] 3. Due to the technical limitations of active power supplies, there is usually only one active power supply for each production line.

[0007] Therefore, the existing power supply system is not only costly, but also has low overall operating efficiency. Utility Model Content

[0008] The purpose of this invention is to provide a power supply system based on a solid-state transformer, which can effectively solve at least one defect of the prior art.

[0009] To achieve the above objectives, this utility model provides a power supply system based on a solid-state transformer, comprising: a solid-state transformer and a load; the input terminal of the solid-state transformer is electrically connected to the AC output terminal of a substation via a medium-voltage AC bus, and the output terminal of the solid-state transformer is electrically connected to the load via a DC bus; a group of the loads is electrically connected to the DC bus to form a production line, and multiple production lines operate in parallel; power flows bidirectionally between the solid-state transformer and the production line, and power flows bidirectionally among the multiple production lines.

[0010] In some embodiments of this utility model, a plurality of solid-state transformers are connected in parallel, with their input terminals electrically connected and their output terminals electrically connected.

[0011] In some embodiments of this utility model, the load includes a photovoltaic cutting machine, the input terminal of which is electrically connected to the DC bus.

[0012] In some embodiments of this utility model, the photovoltaic cutting machine in one of the production lines collects the power generated to the DC bus, wherein the collected power is transmitted to the photovoltaic cutting machine in other production lines via the DC bus, or fed back to the medium-voltage AC bus via the solid-state transformer.

[0013] In some embodiments of this utility model, the power supply system based on solid-state transformers further includes a human-machine interaction unit, which is connected to the load via Ethernet communication.

[0014] In some embodiments of this invention, the load includes a DC load.

[0015] In some embodiments of this utility model, the power supply system based on a solid-state transformer further includes a bidirectional DC / DC converter disposed between the DC load and the DC bus, wherein the bidirectional DC / DC converter is an isolated converter or a non-isolated converter.

[0016] In some embodiments of this utility model, the power supply system based on a solid-state transformer further includes a bidirectional DC / AC converter, the load includes an AC load, and the bidirectional DC / AC converter is disposed between the AC load and the DC bus.

[0017] In some embodiments of this utility model, the bidirectional DC / AC converter is an isolated converter or a non-isolated converter.

[0018] In some embodiments of this utility model, the solid-state transformer is a bidirectional AC / DC solid-state transformer, and the AC output terminal of the substation outputs an AC output voltage, which is converted into a DC output voltage via the solid-state transformer.

[0019] In some embodiments of this utility model, the solid-state transformer is installed at one end of a factory production line.

[0020] The power supply system of this invention can provide a simpler power supply system for the existing photovoltaic wafer manufacturing industry based on the characteristics of solid-state transformers, thereby shortening the construction cycle, reducing wiring costs and improving the overall system operating efficiency.

[0021] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] The above and other features and advantages of this invention will become more apparent from a detailed description of exemplary embodiments with reference to the accompanying drawings.

[0023] Figure 1 A schematic diagram of a typical example of a power supply system 100' used in the existing photovoltaic wafer manufacturing industry;

[0024] Figure 2 This is a schematic diagram of the power supply system based on a solid-state transformer according to this utility model;

[0025] Figure 3 This is a schematic diagram of a power supply system based on a solid-state transformer, which is another embodiment of the present invention. Detailed Implementation

[0026] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed description will be omitted.

[0027] In describing the elements / components described and / or illustrated herein, the terms “a,” “an,” “the,” “the,” and “at least one” are used to indicate the presence of one or more elements / components. The terms “comprising,” “including,” and “having” are used to indicate an open-ended inclusion and mean that additional elements / components may exist in addition to those listed. Furthermore, the terms “first,” “second,” etc., in the claims are used only as designations and are not intended to limit the number of objects to which they pertain.

[0028] It should be understood that the wording or terminology used herein is for descriptive purposes and not for limitation, so that those skilled in the art can interpret the terms or wording of this specification based on the teachings herein.

[0029] Furthermore, the present invention may reuse element symbols and / or letters in various embodiments or examples. This repetition is for simplicity and clarity and does not in itself limit the relationship between the various embodiments and / or configurations discussed.

[0030] like Figure 2As shown, the power supply system 100 based on a solid-state transformer provided by this utility model includes a solid-state transformer (SST) 20 and a load 40. The input terminal of the solid-state transformer 20 is electrically connected to the AC output terminal of substation A via a medium-voltage AC bus 12, and the output terminal of the solid-state transformer 20 is electrically connected to the load 40 via a DC bus 24. Furthermore, a group of loads 40 electrically connected to the DC bus 24 forms a production line, and power flows bidirectionally between the solid-state transformer 20 and the production line. The power supply system 100 based on a solid-state transformer of this utility model can be applied to the photovoltaic wafer manufacturing industry, but this utility model is not limited thereto.

[0031] In some embodiments, multiple loads 40 are connected in parallel to the DC bus 24, which can also be understood as multiple production lines operating in parallel. Furthermore, power flows bidirectionally between the multiple production lines. For example, in... Figure 2 and Figure 3 In the embodiment shown, the input terminals of a group of loads 40 are connected to the DC bus 24 to form a production line. N groups of loads 40 form N production lines that operate in parallel, namely production line 1, production line 2, ..., production line N, etc. The input terminals of the N groups of loads 40 are connected in parallel to the DC bus 24.

[0032] In some possible embodiments, there can be two production lines, which operate in parallel and can be connected to the same DC bus 24.

[0033] In some possible embodiments, the number of production lines is 20, and the 20 production lines operate in parallel. The 20 production lines can be connected to the same DC bus 24 or to different DC buses 24.

[0034] In some embodiments, the power supply system 100 of this utility model may include a plurality of solid-state transformers 20 connected in parallel, the input terminals of the plurality of solid-state transformers 20 being electrically connected, the output terminals of the plurality of solid-state transformers 20 being electrically connected, and the input terminal of each solid-state transformer 20 being connected to a medium-voltage AC bus 12, and the output terminal of each solid-state transformer 20 being connected to a DC bus 24. Figure 3 The embodiment shown includes two solid-state transformers 20 connected in parallel.

[0035] In some possible embodiments, the number of solid-state transformers 20 may also be three, with the three solid-state transformers 20 connected in parallel. The input terminal of each solid-state transformer 20 is electrically connected to the AC output terminal of substation A through the medium-voltage AC bus 12, and the output terminal of each solid-state transformer 20 is connected to the DC bus 24.

[0036] In this invention, based on the output power of the solid-state transformer 20 or the power of the load 40, the power of the solid-state transformer 20 and the load 40 can be matched to calculate the number of solid-state transformers 20 connected in parallel and the number of loads 40 connected in parallel. Of course, it is understood that the number of solid-state transformers 20, loads 40, and production lines is not limited to this; for example, the number of solid-state transformers 20 can be only one.

[0037] exist Figure 2 In the illustrated embodiment, preferably, substation A can be, for example, an independent substation, including transformer 10, which converts 110kV AC voltage into AC output voltage. The AC output voltage can be 35kV, 10kV, or 6kV. Solid-state transformer 20 is a bidirectional AC / DC converter, which converts the AC output voltage into DC output voltage, which can be 0V to 1500V. Of course, it is understood that the values ​​of the AC output voltage and / or DC output voltage are not limited thereto, and can be designed accordingly based on different requirements.

[0038] exist Figure 2 In the illustrated embodiment, preferably, the solid-state transformer 20 is located at one end of the factory production line C.

[0039] In some embodiments, load 40 may include a photovoltaic cutter, and the input of the photovoltaic cutter may be electrically connected to DC bus 24.

[0040] In some embodiments, the photovoltaic (PV) cutting machines in one production line collect their power generation to a corresponding DC bus 24. The collected power generation is then transmitted via the DC bus 24 to PV cutting machines in other production lines, or fed back to the medium-voltage AC bus 12 via a solid-state transformer 20. More specifically, the PV cutting machines may have a power demand supply state during startup and normal operation, and a reverse power generation state during deceleration and braking. The reverse power generation state can also be understood as a regenerative braking state to recover the braking energy of the PV cutting machines. Preferably, the PV cutting machines in the reverse power generation state collect their power generation to the corresponding DC bus 24. The collected power generation supplements the power demand of PV cutting machines in other production lines in the power demand supply state during startup and operation; or, the power generation collected on the DC bus 24 is fed back to the medium-voltage AC bus 12 via the solid-state transformer 20 for use by the overall factory power grid.

[0041] In some possible embodiments, the medium-voltage AC bus 12 can also be a medium-voltage power grid. The medium-voltage AC bus 12 consists of medium-voltage AC distribution lines.

[0042] In other words, the power supply system of this utility model applied to the photovoltaic wafer manufacturing industry can achieve "bidirectional energy feedback". That is, it can not only provide the power of substation A to the load 40 such as photovoltaic cutting machine through medium-voltage AC bus 12 and DC bus 24, but also provide the power generated by the photovoltaic cutting machine in reverse power generation state to supplement the power demand of photovoltaic cutting machines in other production lines in the power demand supply state during startup and operation, or feed it back to medium-voltage AC bus 12.

[0043] In some embodiments, the solid-state transformer-based power supply system 100 may further include a human-machine interface (HMI) 50, which can be communicatively connected to a load 40 (e.g., including but not limited to a photovoltaic cutter) via Ethernet 45. The HMI 50 provides communication between the operator and automated equipment (e.g., including but not limited to a photovoltaic cutter), including but not limited to parameter setting and the presentation of monitoring data. In this invention, the HMI 50 may also have a built-in application program for implementing "two-way energy feedback" control, etc.

[0044] In some embodiments, the load 40 may include a DC load. A DC / DC converter may not be required between the DC load and the DC bus 24; the DC load is directly connected to the solid-state transformer 20 via the DC bus 24. Alternatively, a DC / DC converter may be provided between the DC load and the DC bus 24, wherein the DC / DC converter can be a bidirectional DC / DC converter (e.g., a...). Figure 3 (As shown in production line 3). Preferably, the DC / DC converter can be an isolated converter or a non-isolated converter.

[0045] In some embodiments, the load 40 may include an AC load, and a DC / AC converter may be provided between the AC load and the DC bus 24, wherein the DC / AC converter may be a bidirectional DC / AC converter (e.g., Figure 3 (As shown in production line 2). Preferably, the DC / AC converter can be an isolated converter or a non-isolated converter.

[0046] The following table uses a power supply system for a 2.5KVA production line as an example. The system includes 20 production lines. The effects of the power supply system based on solid-state transformers proposed in this invention compared with traditional solutions are shown in Table 1 below:

[0047] Table 1:

[0048]

[0049] In Table 1, "√" indicates "present" and "×" indicates "absent". Comparison shows that the solid-state transformer-based power supply system of this invention can replace the medium-voltage transformer (e.g., 10kV to 380V), filtering devices, low-voltage AC power distribution, low-voltage AC wiring, active power supplies in the lines, and capacitor modules at the end of the structure for instantaneous voltage balancing in traditional power supply systems, thereby reducing intermediate wiring. Furthermore, due to the simplified wiring, factory construction costs and workload will be significantly reduced. For example, the solid-state transformer-based power supply system of this invention saves on the design and construction costs of the factory's power distribution room by placing the solid-state transformer at one end of the factory production line. Furthermore, the construction and delivery cycle is significantly shortened. For instance, the solid-state transformer-based power supply system of this invention only requires the installation of 3 medium-voltage AC wirings and 3 sets of SST power supplies, with a shorter SST installation and commissioning time. In contrast, traditional solutions require a large number of devices, such as 20 low-voltage AC wirings, 20 sets of active power supplies, and 20 sets of capacitor modules, greatly increasing the installation and system commissioning cycles. In addition, the solid-state transformer-based power supply system of this invention adopts a minimalist modular architecture. Compared to traditional solutions, the SST solution of this invention reduces equipment and wiring components, namely, eliminating the medium-voltage transformer, filter device, low-voltage AC power distribution, low-voltage AC power distribution lines, active power supplies, and capacitor modules found in traditional solutions. This not only improves reliability but also helps to enhance the overall system operating efficiency. In other words, the SST solution of this invention has high reliability and can operate safely and continuously year-round, with higher overall efficiency than traditional solutions.

[0050] The power supply system based on solid-state transformers of this invention can provide a simpler power supply system for the existing photovoltaic wafer manufacturing industry based on the characteristics of solid-state transformers (SST), thereby shortening the construction cycle, reducing wiring costs and improving the overall system operating efficiency.

[0051] Exemplary embodiments of the present invention have been specifically shown and described above. It should be understood that the present invention is not limited to the disclosed embodiments; rather, the present invention is intended to cover various modifications and equivalent arrangements contained within the spirit and scope of the appended claims.

Claims

1. A power supply system based on a solid-state transformer, characterized in that, include: A solid-state transformer and a load are provided. The input terminal of the solid-state transformer is electrically connected to the AC output terminal of the substation via a medium-voltage AC bus, and the output terminal of the solid-state transformer is electrically connected to the load via a DC bus. A group of the loads is electrically connected to the DC bus to form a production line, and multiple production lines operate in parallel; power flows bidirectionally between the solid-state transformer and the production line, and power flows bidirectionally between multiple production lines.

2. The power supply system based on a solid-state transformer according to claim 1, characterized in that, It includes multiple solid-state transformers connected in parallel, with their input terminals electrically connected and their output terminals electrically connected.

3. The power supply system based on a solid-state transformer according to claim 1, characterized in that, The load includes a photovoltaic cutting machine, the input of which is electrically connected to the DC bus.

4. The power supply system based on a solid-state transformer according to claim 3, characterized in that, The photovoltaic cutting machine in one of the production lines collects the generated electricity to the DC bus, wherein the collected generated electricity is transmitted via the DC bus to the photovoltaic cutting machine in other production lines, or fed back to the medium-voltage AC bus via the solid-state transformer.

5. The power supply system based on a solid-state transformer according to claim 4, characterized in that, Also includes: The human-computer interaction unit is connected to the load via Ethernet communication.

6. The power supply system based on a solid-state transformer according to claim 1, characterized in that, The load includes a DC load.

7. The power supply system based on a solid-state transformer according to claim 6, characterized in that, It also includes a bidirectional DC / DC converter disposed between the DC load and the DC bus, wherein the bidirectional DC / DC converter is an isolated converter or a non-isolated converter.

8. The power supply system based on a solid-state transformer according to claim 1, characterized in that, It also includes a bidirectional DC / AC converter, wherein the load includes an AC load, and the bidirectional DC / AC converter is disposed between the AC load and the DC bus.

9. The power supply system based on a solid-state transformer according to claim 8, characterized in that, The bidirectional DC / AC converter can be an isolated converter or a non-isolated converter.

10. The power supply system based on a solid-state transformer according to claim 1, characterized in that, The solid-state transformer is a bidirectional AC / DC solid-state transformer. The AC output terminal of the substation outputs an AC output voltage, which is then converted into a DC output voltage via the solid-state transformer.

11. The power supply system based on a solid-state transformer according to claim 1, characterized in that, The solid-state transformer is installed at one end of the factory production line.

Images