Power conversion devices and hybrid power generation equipment
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-23
- Publication Date
- 2026-08-14
AI Technical Summary
[0003]本申请的目的在于提供一种功率变换装置和混合发电设备，旨在解决相关技术中，发电机能够提供的工作模式较少，发电效率较低的问题
[0019]本申请实施例与相关技术相比存在的有益效果是：本申请实施例提供的功率变换装置，包括整流器、逆变器、双向直流变换器、双向交直流变换器和开关模块，开关模块能够连接逆变器、双向交直流变换器、电网和负载，功率变换装置应用于混合发电设备时，可以通过整流器和逆变器输出交流发电装置的发电功率。该发电功率或电网功率可以通过开关模块、双向交直流变换器、双向直流变换器给储能装置充电。该发电功率也可以通过开关模块给电网馈电和/或给负载供电。也可以关闭交流发电装置，仅使用储能装置通过双向直流变换器、双向交直流变换器、开关模块给负载供电；发电功率、电网和储能装置也可以同时给负载供电。可见，可以实现多种工作模式，使得交流发电装置能最大程度的始终能维持工作在较高或最高的效率，提高能源的利用率和经济性。
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Figure CN224637960U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of power technology, and in particular relates to a power conversion device and a hybrid power generation equipment. Background Technology
[0002] Conventional hybrid generators use an internal combustion engine to drive a generator, which then converts the generated electricity into a stable AC voltage output via an inverter. While the inverter produces the AC output, in many applications, the inverter also requires a low-voltage DC output to charge batteries or power other DC loads. In these cases, the inverter's output also includes a DC-DC converter. However, conventional generators offer limited operating modes, have lower power generation efficiency, and are not suitable for a wide range of applications. Utility Model Content
[0003] The purpose of this application is to provide a power conversion device and a hybrid power generation device, which aims to solve the problems in the related technology where the generator can provide fewer operating modes and has lower power generation efficiency.
[0004] In a first aspect, embodiments of this application provide a power conversion device, including:
[0005] A rectifier includes an AC input terminal and a DC output terminal. The AC input terminal is used to connect to an AC power generation device and is used to convert AC power received from the AC input terminal into DC power and output it from the DC output terminal.
[0006] An inverter includes a DC input terminal and an AC output terminal, wherein the DC input terminal is connected to the DC output terminal and is used to convert DC power received from the DC output terminal into AC power and output it from the AC output terminal;
[0007] A bidirectional DC-DC converter includes a first DC terminal and a second DC terminal. The first DC terminal is used to connect to an energy storage device. The bidirectional DC-DC converter is used to convert the DC power received from the first DC terminal into voltage and output it from the second DC terminal, or to convert the DC power received from the second DC terminal into voltage and output it from the first DC terminal.
[0008] A bidirectional AC / DC converter includes a third DC terminal and an AC terminal, wherein the third DC terminal is connected to a second DC terminal. The bidirectional AC / DC converter is used to convert DC power received from the third DC terminal into AC power and output it from the AC terminal; or, it is used to convert AC power received from the AC terminal into DC power and output it from the third DC terminal.
[0009] The switching module includes a first terminal, a second terminal, a third terminal, and a fourth terminal. The first terminal is connected to the AC output terminal, the second terminal is connected to the AC terminal, the third terminal is used to connect to the power grid, and the fourth terminal is used to connect to the load.
[0010] In one embodiment, the switch module includes a first switch connected in series between the first terminal and the fourth terminal.
[0011] In one embodiment, the switch module includes a second switch connected in series between the second terminal and the fourth terminal.
[0012] In one embodiment, the switch module includes a third switch connected in series between the third terminal and the fourth terminal.
[0013] In one embodiment, the first switch, the second switch, and the third switch are all relays.
[0014] Secondly, embodiments of this application provide a hybrid power generation device, including an AC power generation device and a power conversion device as described above, wherein the AC power generation device is connected to the AC input terminal of the rectifier.
[0015] In one embodiment, an energy storage device is also included, which is connected to the first DC terminal of the bidirectional DC-DC converter.
[0016] In one embodiment, the energy storage device includes a battery and a heating module, the heating module being enclosed within the battery.
[0017] In one embodiment, a control module is also included; the control module is used to control the AC power generation device to operate at its maximum efficiency point and to control the energy storage device to supplement the load with energy, or to absorb the remaining energy of the AC power generation device.
[0018] In one embodiment, the AC power generation device includes a fuel generator.
[0019] The beneficial effects of this application embodiment compared with related technologies are as follows: The power conversion device provided in this application embodiment includes a rectifier, an inverter, a bidirectional DC-DC converter, a bidirectional AC-DC converter, and a switching module. The switching module can connect the inverter, the bidirectional AC-DC converter, the power grid, and the load. When the power conversion device is applied to hybrid power generation equipment, it can output the power generated by the AC power generation device through the rectifier and inverter. This power generated or the power from the grid can charge the energy storage device through the switching module, the bidirectional AC-DC converter, and the bidirectional DC-DC converter. This power generated can also feed power to the grid and / or supply power to the load through the switching module. Alternatively, the AC power generation device can be turned off, and only the energy storage device can supply power to the load through the bidirectional DC-DC converter, the bidirectional AC-DC converter, and the switching module; the power generated, the grid, and the energy storage device can also supply power to the load simultaneously. Therefore, multiple operating modes can be achieved, enabling the AC power generation device to maintain a high or highest efficiency at all times, improving energy utilization and economy. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the structure of a power conversion device provided in an embodiment of this application;
[0021] Figure 2 This is another schematic diagram of the power conversion device provided in an embodiment of this application;
[0022] Figure 3 This is a schematic diagram of the structure of a hybrid power generation device provided in an embodiment of this application;
[0023] Figure 4 For this Figure 3 The diagram shows the structure of the energy storage device in the hybrid power generation equipment;
[0024] Figure 5 This is another structural schematic diagram of a hybrid power generation device provided in an embodiment of this application. Detailed Implementation
[0025] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.
[0026] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.
[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.
[0028] Please see Figure 1 One embodiment of this application provides a power conversion device 100, including a rectifier 110, an inverter 120, a bidirectional DC-DC converter 130, a bidirectional AC-DC converter 140, and a switching module 150.
[0029] The rectifier 110 includes an AC input terminal and a DC output terminal. The AC input terminal is used to connect to the AC power generation device 200 and to convert the AC power received from the AC input terminal into DC power and output it from the DC output terminal.
[0030] Inverter 120 includes a DC input terminal and an AC output terminal. The DC input terminal is connected to the DC output terminal of rectifier 110 and is used to receive DC power from the DC output terminal of rectifier 110, convert it into AC power, and output it from the AC output terminal.
[0031] The bidirectional DC-DC converter 130 includes a first DC terminal and a second DC terminal. The first DC terminal is used to connect to the energy storage device 300. The bidirectional DC-DC converter 130 is used to convert the DC power received from the first DC terminal into voltage and output it from the second DC terminal, or to convert the DC power received from the second DC terminal into voltage and output it from the first DC terminal.
[0032] The bidirectional AC / DC converter 140 includes a third DC terminal and an AC terminal. The third DC terminal is connected to the second DC terminal. The bidirectional AC / DC converter 140 is used to convert DC power received from the third DC terminal into AC power and output it from the AC terminal, or to convert AC power received from the AC terminal into DC power and output it from the third DC terminal.
[0033] The switching module 150 includes a first terminal, a second terminal, a third terminal, and a fourth terminal. The first terminal of the switching module 150 is connected to the AC output terminal of the inverter 120, the second terminal of the switching module 150 is connected to the AC terminal of the bidirectional AC / DC converter 140, the third terminal of the switching module 150 is used to connect to the power grid, and the fourth terminal of the switching module 150 is used to connect to the load.
[0034] The AC power generation device 200 is, for example, a fuel generator such as an oil and / or gas generator. The power generated by the AC power generation device 200 or the grid power can charge the energy storage device 300 through the second terminal of the switching module 150, the bidirectional AC / DC converter 140, and the bidirectional DC converter 130. This power generation can also be used to feed power to the grid and / or supply power to the load through the switching module 150. In some cases, the AC power generation device 200 can be shut down, and only the energy storage device 300 can be used to supply power to the load through the bidirectional DC converter 130, the bidirectional AC / DC converter 140, and the switching module 150; the power generation, the grid, and the energy storage device 300 can also supply power to the load simultaneously.
[0035] The rectifier 110 includes a rectifier bridge. The inverter 120 can use a conventional inverter circuit. The bidirectional DC-DC converter 130 can use a conventional bidirectional DC-DC circuit. The bidirectional AC-DC converter 140 can use a conventional bidirectional AC-DC circuit, which will not be described in detail here.
[0036] Please see Figure 2 In some embodiments, the switch module 150 includes a first switch K1, which is connected in series between a first terminal and a fourth terminal of the switch module 150.
[0037] In some embodiments, the switch module 150 includes a second switch K2 connected in series between the second terminal and the fourth terminal.
[0038] In some embodiments, the switch module 150 includes a third switch K3, which is connected in series between the third terminal and the fourth terminal.
[0039] In some embodiments, the first switch K1, the second switch K2, and the third switch K3 are all relays.
[0040] Based on the above embodiments, the power conversion device 100 can operate in various scenarios. The following are exemplary scenarios:
[0041] In the grid charging scenario: By controlling the closure of the second switch K2 and the third switch K3, the grid voltage is used to charge the energy storage device 300 through the second switch K2, the third switch K3, the bidirectional AC / DC converter 140, and the bidirectional DC converter 130. In this scenario, if an (AC) load is connected, the grid also supplies power to the load through the third switch K3 and the fourth terminal of the switch module 150.
[0042] In a power generation and charging scenario with load: the third switch K3 is opened, and the first switch K1 and the second switch K2 are closed. The AC power generation device 200 supplies power to the load through the rectifier 110, inverter 120, first switch K1, and the fourth terminal of the switch module 150. At the same time, the AC power generation device 200 also charges the energy storage device 300 through the second switch K2, bidirectional AC-DC converter 140, and bidirectional DC converter 130.
[0043] Energy storage under load scenario: Generally used when the power grid is out or the load is low. At this time, the first switch K1 and the third switch K3 are opened, and the second switch K2 is closed. The energy storage device 300 supplies power to the load through the bidirectional DC converter 130, the bidirectional AC-DC converter 140, the second switch K2, and the fourth terminal of the switch module 150.
[0044] AC parallel operation with load scenario: When the power grid fails, the third control switch K3 is opened, and the first control switch K1 and the second control switch K2 are closed. The energy storage device 300 outputs power through the bidirectional DC converter 130, the bidirectional AC-DC converter 140, and the second switch K2. The AC power generation device 200 outputs power through the rectifier 110, the inverter 120, and the first switch K1. After AC parallel operation, the load is powered through the fourth terminal of the switch module 150.
[0045] The power conversion device 100 provided in this embodiment of the application constitutes an AC parallel operation architecture. By controlling the switching module 150, AC parallel operation of the energy storage device 300 and the AC power generation device 200 is realized. In addition, by adjusting the states of the three switches, the first switch K1, the second switch K2, and the third switch K3, four operating modes can be realized: grid charging, power generation charging, energy storage under load, and AC parallel operation under load, thereby fully improving the energy utilization rate of fuel and energy storage.
[0046] Please see Figure 3 Secondly, embodiments of this application provide a hybrid power generation device 400, including an AC power generation device 200 and a power conversion device 100 as described above, wherein the AC power generation device 200 is connected to the AC input terminal of the rectifier 110.
[0047] In some embodiments, the hybrid power generation device 400 further includes an energy storage device 300 connected to a first DC terminal of the bidirectional DC-DC converter 130. The energy storage device 300 may include a single battery or a group of batteries. In some embodiments, the energy storage device 300 is externally mounted to the hybrid power generation device 400.
[0048] Please see Figure 4In some embodiments, the energy storage device 300 includes a battery 310 and a heating module 320, with the heating module 320 covering the battery 310. The heating module 320 can heat the battery 310 based on the grid voltage or the AC power supply from the AC power generation device 200, ensuring that the temperature of the battery 310 is kept above 0°C, thereby maintaining the charge and discharge performance of the battery 310.
[0049] In one embodiment, the energy storage device 300 may include any form of energy storage device, including a battery 310, a capacitor, or any combination thereof. Any type of battery 310 may be used, including secondary or primary batteries. Examples of usable secondary batteries include lithium-ion, nickel-metal hydride, nickel-cadmium, flow batteries, lead-acid batteries, lithium-air batteries, nickel-metal hydride batteries, or polymer-based batteries. The batteries 310 may be connected to a rack in parallel and / or series. In some embodiments, the battery rack may be configured to store one or more battery holders, vertically stacked, horizontally arranged, or any combination thereof, of battery cells. Each holder may contain a battery management system (BMS) for the battery 310 and multiple battery cells.
[0050] Please see Figure 5 In some embodiments, the hybrid power generation device 400 further includes a control module 410. The control module 410 controls the AC power generation device 200 to operate at its maximum efficiency point and controls the energy storage device 300 to supplement the load with energy, or to absorb the surplus energy of the AC power generation device 200. The control module 410 includes a control chip such as a DSP (Digital Signal Processor) or a MCU (Micro Control Unit). By controlling the AC power generation device 200 to operate at its maximum efficiency point, the control module 410 can improve energy utilization.
[0051] In some embodiments, the control module 410 is also connected to the first switch K1, the second switch K2 and the third switch K3, and is used to control the closing or opening of the first switch K1, the second switch K2 and the third switch K3 respectively according to the user's operation or based on energy management, thereby switching to the working mode that matches any of the above scenarios.
[0052] In some embodiments, the control module 410 is also connected to the inverter 120, the bidirectional DC-DC converter 130, and the bidirectional AC-DC converter 140, for controlling the operation of each module respectively.
[0053] For example, the hybrid power generation device 400 is a portable hybrid generator. A portable hybrid generator may include a system for managing energy and load using a small, portable package. Portable hybrid generators may offer several advantages over conventional generators. They may have quieter operating times and more efficient fuel consumption compared to traditional generators. In some cases, the portable hybrid generator may include an AC power generation unit 200. The AC power generation unit 200 may include, for example, a fuel generator specifically designed for speed regulation of the energy storage unit 300, which can operate at peak efficiency 100% of the time compared to a conventional generator. Combining a fuel generator with the energy storage unit 300 can provide significant advantages over a conventional generator. In some cases, even when there is no load on the portable hybrid generator, the energy generated by the AC power generation unit 200 can be stored in the energy storage unit 300. Therefore, energy from the AC power generation unit 200 can be conserved rather than wasted. This contrasts with a portable generator lacking the energy storage unit 300, which may operate under suboptimal conditions and thus potentially waste fuel.
[0054] In other embodiments, the hybrid power generation device 400, such as a backup generator, together with the home energy storage system forms a home energy system to power the home load.
[0055] In some embodiments, the hybrid power generation device 400 further includes a fuel tank (not shown) for storing a liquid or gaseous raw fuel source. The fuel tank may include a lid or cap for holding the raw fuel source. In some cases, the fuel tank may include a container for containing and transporting the liquid fuel source. In other cases, the fuel tank may include one or more ports for connecting to a cylinder containing a gas, such as propane gas. In some embodiments, the fuel tank may include a fuel level sensor.
[0056] For example, the hybrid power generation device 400 includes a grid interface 420 and an AC load interface 430. The grid interface 420 and the AC load interface 430 are respectively connected to the third and fourth terminals of the switch module 150.
[0057] For example, the hybrid power generation device 400 also includes a DC load interface 440, which is connected to the DC output terminal of the rectifier 110 and / or the second DC terminal of the bidirectional DC converter 130. The DC load interface 440 is used to supply power to the DC load based on the output power of the AC power generation device and / or based on the electrical energy of the energy storage device 300.
[0058] The beneficial effects of this application embodiment compared with related technologies are as follows: The power conversion device 100 provided in this application embodiment includes a rectifier 110, an inverter 120, a bidirectional DC-DC converter 130, a bidirectional AC-DC converter 140, and a switching module 150. The switching module 150 can connect the inverter 120, the bidirectional AC-DC converter 140, the power grid, and the load. When the power conversion device 100 is applied to the hybrid power generation equipment 400, the power generation power of the AC power generation device 200 can be output through the rectifier 110 and the inverter 120. This power generation power or grid power can charge the energy storage device 300 through the switching module 150, the bidirectional DC-DC converter 130, and the bidirectional AC-DC converter 140. The generated power can also be fed to the grid and / or supply power to the load through the switching module 150; alternatively, the AC power generation device 200 can be shut down, and only the energy storage device 300 can supply power to the load through the bidirectional DC converter 130, bidirectional AC-DC converter 140, and switching module 150; the generated power, the grid, and the energy storage device 300 can also supply power to the load simultaneously. Therefore, multiple operating modes can be achieved, enabling the AC power generation device 200 to maintain a high or highest efficiency at all times, improving energy utilization and economy.
[0059] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.
Claims
1. A power conversion device, characterized by, include: A rectifier includes an AC input terminal and a DC output terminal. The AC input terminal is used to connect to an AC power generation device and is used to convert AC power received from the AC input terminal into DC power and output it from the DC output terminal. An inverter includes a DC input terminal and an AC output terminal, wherein the DC input terminal is connected to the DC output terminal and is used to convert DC power received from the DC output terminal into AC power and output it from the AC output terminal; A bidirectional DC-DC converter includes a first DC terminal and a second DC terminal. The first DC terminal is used to connect to an energy storage device. The bidirectional DC-DC converter is used to convert the DC power received from the first DC terminal into voltage and output it from the second DC terminal, or to convert the DC power received from the second DC terminal into voltage and output it from the first DC terminal. A bidirectional AC-DC converter includes a third DC terminal and an AC terminal, wherein the third DC terminal is connected to a second DC terminal. The bidirectional AC-DC converter is used to convert DC power received from the third DC terminal into AC power and output it from the AC terminal, or to convert AC power received from the AC terminal into DC power and output it from the third DC terminal. as well as The switching module includes a first terminal, a second terminal, a third terminal, and a fourth terminal. The first terminal is connected to the AC output terminal, the second terminal is connected to the AC terminal, the third terminal is used to connect to the power grid, and the fourth terminal is used to connect to the load.
2. The power conversion device of claim 1, wherein, The switch module includes a first switch, which is connected in series between the first terminal and the fourth terminal.
3. The power conversion device of claim 2, wherein, The switch module includes a second switch, which is connected in series between the second terminal and the fourth terminal.
4. The power conversion device of claim 3, wherein, The switch module includes a third switch, which is connected in series between the third terminal and the fourth terminal.
5. The power conversion device as described in claim 4, characterized in that, The first switch, the second switch, and the third switch are all relays.
6. A hybrid power plant characterized by It includes an AC power generation device and a power conversion device as described in any one of claims 1 to 5, wherein the AC power generation device is connected to the AC input terminal of the rectifier.
7. The hybrid power plant of claim 6, wherein It also includes an energy storage device, which is connected to the first DC terminal of the bidirectional DC converter.
8. The hybrid power plant of claim 7, wherein, The energy storage device includes a battery and a heating module, with the heating module encasing the battery.
9. The hybrid power plant according to any one of claims 6 to 8, wherein It also includes a control module; the control module is used to control the AC power generation device to operate at its maximum efficiency point and to control the energy storage device to supply power to the load as energy supplement, or to absorb the remaining energy of the AC power generation device.
10. The hybrid power plant of claim 6, wherein, The AC power generation device includes a fuel generator.