A multi-coupling system electrical architecture

Abstract

This invention belongs to the field of energy utilization technology and provides an electrical architecture for a combined heat and power (CHP) system to improve energy utilization efficiency. This application includes a photovoltaic (PV) unit for converting solar energy into electrical energy, an energy storage unit for buffering and storing the electrical energy generated by the PV unit, a hydrogen cogeneration unit for providing heat energy to users, and a hydrogen-oxygen supply unit for generating hydrogen and oxygen through water electrolysis technology. This CHP system provides users with multi-source energy. In this way, the electrical energy generated by the PV unit is transmitted to the corresponding load through the DC bus and AC bus sides of the integrated PV-energy storage unit in the CHP system. This allows the electrical energy generated by the PV unit to directly exchange energy with the energy storage unit, hydrogen production power source, and hydrogen cogeneration unit via the DC bus side, avoiding the multi-stage current conversion required by existing AC-side coupling schemes, thereby improving the overall energy utilization efficiency.

Description

Technical Field

[0001] This invention relates to the field of energy utilization technology, and more specifically, to an electrical architecture for a combined heat and power (CHP) system. Background Technology

[0002] Mobile microgrids are small, autonomous power systems that highly integrate distributed power sources (such as photovoltaics and diesel engines), energy storage units, AC / DC power distribution, and protection devices. Multi-energy supply solutions are also widely used in mobile microgrids.

[0003] Multi-energy supply schemes in mobile microgrids are usually based on AC-side coupling schemes. However, AC-side coupling schemes require multiple loads to perform current conversion, which reduces energy utilization efficiency. Summary of the Invention

[0004] This application aims to provide an electrical architecture for a combined heat and power (CHP) system to address the problem of low energy utilization efficiency caused by AC-side coupling schemes in multi-energy supply solutions in mobile microgrids.

[0005] This application provides an electrical architecture for a combined heat and power (CHP) system, including: a photovoltaic unit, an energy storage unit, a hydrogen CHP unit, and a hydrogen and oxygen supply unit; Photovoltaic units are used to convert solar energy into electrical energy; Energy storage units are used to store the electrical energy generated by photovoltaic units; The hydrogen and oxygen supply unit is used to generate hydrogen and oxygen through water electrolysis technology. Hydrogen-based combined heat and power units are used to provide heat energy to users; The photovoltaic unit is electrically connected to the hydrogen production power supply, energy storage unit and hydrogen cogeneration unit of the hydrogen and oxygen supply unit via the DC bus side of the photovoltaic-energy storage integrated unit in the hydrogen and oxygen supply unit. The photovoltaic unit is electrically connected to the grid-connected terminal via the AC bus side of the photovoltaic-storage integrated unit.

[0006] One possible implementation is that the hydrogen and oxygen supply unit includes a photovoltaic-storage integrated unit, a hydrogen production power source, a hydrogen production system, and an oxygen production system; The oxygen generation system is used to provide oxygen to users.

[0007] One possible implementation is that the combined solar power system also includes a power distribution control unit, which is electrically connected to the AC bus side of the photovoltaic-storage integrated unit. The power distribution control unit is used to control the hydrogen production system and the oxygen production system to produce the corresponding hydrogen and oxygen.

[0008] One possible implementation is that when the photovoltaic-storage integrated unit provides power support through the DC bus side and AC bus side, it prioritizes providing power distribution guarantees for the hydrogen cogeneration unit, energy storage unit, hydrogen production power supply and power distribution control unit to ensure the stability of multi-energy output.

[0009] One possible implementation is that both the hydrogen production power source and the photovoltaic-storage integrated unit adopt an electrical isolation mode to prevent mutual interference between the DC bus side and the AC bus side.

[0010] One possible implementation is that the hydrogen cogeneration unit uses hydrogen produced by the hydrogen-oxygen supply unit as an energy source to generate electricity.

[0011] One possible implementation is that the hydrogen cogeneration unit also utilizes the waste heat from the power generation process to provide thermal energy to users.

[0012] One possible implementation is to connect the power output terminal of the photovoltaic unit to the photovoltaic side of the integrated photovoltaic and energy storage unit, so as to transfer the power converted by the photovoltaic unit to the integrated photovoltaic and energy storage unit.

[0013] One possible implementation is to connect the energy storage side of the integrated photovoltaic and energy storage unit to the electrical power end of the energy storage unit, the hydrogen cogeneration unit, and the hydrogen production power source, so that the energy storage unit, the hydrogen cogeneration unit, and the hydrogen production power source can obtain the electrical energy converted by the photovoltaic unit.

[0014] One possible implementation is that the integrated photovoltaic and energy storage unit is used to simultaneously provide power support for loads on both the DC bus side and the AC bus side.

[0015] In summary, due to the adoption of the above technical solutions, the beneficial effects of this invention are as follows: By comprising a multi-source energy supply system including a photovoltaic unit for converting solar energy into electrical energy, an energy storage unit for buffering and storing the electrical energy generated by the photovoltaic unit, a hydrogen cogeneration unit for providing heat energy to users, and a hydrogen-oxygen supply unit for generating hydrogen and oxygen through water electrolysis technology, this invention provides users with multi-source energy. Thus, this application transmits the electrical energy generated by the photovoltaic unit to the corresponding load through the DC bus side and AC bus side of the integrated photovoltaic and energy storage unit. This allows the electrical energy generated by the photovoltaic unit to directly exchange energy with the energy storage unit, hydrogen production power supply, and hydrogen cogeneration unit via the DC bus side, avoiding the multi-stage current conversion required by existing AC-side coupling schemes, thereby improving the overall energy utilization efficiency. Attached Figure Description

[0016] Figure 1 A schematic diagram of a conventional AC-side coupling scheme provided for an embodiment of this application; Figure 2 This is a schematic diagram of the electrical architecture of a combined cooling, heating, and power (CCHP) system provided in an embodiment of this application. Detailed Implementation

[0017] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone.

[0018] Furthermore, the terms "comprising" and "having," and any variations thereof, used in the description of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include other steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0019] It should be noted that in the embodiments of this application, the words "exemplary" or "for example" are used to indicate examples, illustrations, or explanations. Any embodiment or design scheme described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design schemes. Specifically, the use of the words "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0020] In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0021] Against the backdrop of accelerated global energy transition and rapid development of distributed power generation technology, problems such as uneven energy distribution, insufficient energy supply in special scenarios, and low efficiency and high pollution of traditional energy utilization are becoming increasingly prominent, urgently requiring flexible, efficient, and clean energy supply solutions. Mobile microgrids, with their flexible deployment and strong adaptability, have become an important way to solve energy supply problems in remote areas and under special operating conditions. This is especially true in areas with weak infrastructure, such as high-altitude plateaus, where conventional energy sources are difficult to access, where the demand for stable, efficient, and multi-energy output from mobile microgrids is even more pressing.

[0022] Figure 1 This is a schematic diagram of a conventional AC-side coupling scheme provided in an embodiment of this application, combined with... Figure 1 The existing AC-side coupling scheme is illustrated below: Currently, multi-energy supply solutions implemented in mobile microgrids mainly use AC-side coupling schemes, referencing existing mature electrical architectures such as large-scale energy storage, photovoltaics, and hydrogen production.

[0023] However, as Figure 1 As shown, the existing AC-side coupling scheme requires the addition of an inverter to convert the DC power obtained from the photovoltaic unit into AC power, and then the photovoltaic-storage integrated machine converts it back into DC power to interact with the energy storage unit and the hydrogen cogeneration unit. The multi-stage energy conversion causes repeated energy loss and reduces energy utilization efficiency.

[0024] To address the aforementioned technical issues, this application provides an electrical architecture for a combined solar power (CSP) system. The electrical energy generated by the photovoltaic unit is transmitted to the corresponding load via the DC bus and AC bus sides of the integrated photovoltaic and energy storage unit. This allows the electrical energy generated by the photovoltaic unit to directly exchange energy with the energy storage unit, hydrogen production power source, and hydrogen cogeneration unit via the DC bus side, avoiding the multi-stage current conversion required by existing AC-side coupling schemes, thereby improving overall energy utilization efficiency.

[0025] Figure 2 This application provides a schematic diagram of the electrical architecture of a combined heat and power (CHP) system, in conjunction with... Figure 2 As shown, the combined heat and power system provided in this application includes: a photovoltaic unit, an energy storage unit, a hydrogen cogeneration unit, and a hydrogen and oxygen supply unit.

[0026] The photovoltaic unit is used to convert solar energy into electrical energy; the energy storage unit is used to buffer and store the electrical energy generated by the photovoltaic unit; the hydrogen and oxygen supply unit is used to generate hydrogen and oxygen through water electrolysis technology; and the hydrogen cogeneration unit is used to provide heat energy to users.

[0027] Furthermore, the DC bus coupling scheme adopted in this application embodiment means that the photovoltaic unit is electrically connected to the hydrogen production power supply, energy storage unit and hydrogen cogeneration unit of the hydrogen-oxygen supply unit through the DC bus side of the photovoltaic-energy storage integrated machine in the hydrogen-oxygen supply unit; the photovoltaic unit is electrically connected to the grid-connected end through the AC bus side of the photovoltaic-energy storage integrated machine.

[0028] Furthermore, the hydrogen and oxygen supply unit includes a photovoltaic storage unit, a hydrogen production power source, a hydrogen production system, and an oxygen production system; among which, the oxygen production system is used to provide oxygen to users.

[0029] The hydrogen cogeneration unit generates electricity using hydrogen produced by the hydrogen-oxygen supply unit, and also utilizes the waste heat from the power generation process to provide heat energy to users.

[0030] Specifically, the photovoltaic (PV) unit, as the energy source of the entire system, is responsible for providing electricity. The electricity generated by the PV unit has two main uses: first, it supplies power to the loads on the AC bus side through the integrated PV-energy storage unit; second, it exchanges energy with the energy storage unit, hydrogen production power source, and hydrogen cogeneration unit on the DC bus side, avoiding the aforementioned issues. Figure 2 The existing solution shown converts the power to AC via an inverter, then converts it to DC via a photovoltaic-storage integrated unit for energy exchange with the energy storage unit and the hydrogen cogeneration unit, before converting it back to AC via an inverter, thus avoiding repeated energy loss.

[0031] Therefore, compared with existing solutions, the DC bus coupling scheme adopted in this application embodiment can improve energy utilization efficiency by 8% by reducing two stages of energy conversion process, and improve the conversion efficiency between light energy, electrical energy and hydrogen energy.

[0032] The power output end of the photovoltaic unit is connected to the photovoltaic side of the photovoltaic-storage integrated machine to transfer the power converted by the photovoltaic unit to the photovoltaic-storage integrated machine; the energy storage side of the photovoltaic-storage integrated machine is connected to the power end of the energy storage unit, the hydrogen cogeneration unit, and the hydrogen production power source so that the energy storage unit, the hydrogen cogeneration unit, and the hydrogen production power source can obtain the power converted by the photovoltaic unit.

[0033] The integrated photovoltaic and energy storage unit is used to provide power support for loads on both the DC bus side and the AC bus side simultaneously.

[0034] Furthermore, when the photovoltaic-storage integrated unit provides power support through the DC bus side and AC bus side, it prioritizes providing power distribution guarantees for the hydrogen cogeneration unit, energy storage unit, hydrogen production power supply and power distribution control unit to ensure the stability of multi-energy output.

[0035] The hydrogen production power supply and the photovoltaic-storage integrated unit both adopt electrical isolation mode to prevent mutual interference between the DC bus side and the AC bus side.

[0036] Furthermore, the combined heat and power system provided in this application embodiment also includes a power distribution control unit, which is electrically connected to the AC bus side of the photovoltaic-storage integrated machine. The power distribution control unit is used to control the hydrogen production system and the oxygen production system to provide the user with the corresponding hydrogen and oxygen.

[0037] In this embodiment, the hydrogen production power supply is directly coupled to the DC bus side, and the rectifier and transformer device is optimized into a DC converter, thereby reducing one stage of AC / DC conversion circuit, lowering costs, and improving energy utilization by about 5%. At the same time, the photovoltaic-storage integrated machine reduces the number of equipment types through the DC coupling scheme, improves system integration, and simplifies the energy conversion process. Meanwhile, the power isolation scheme not only prevents interference from the output side power consumption terminal to the DC bus side, but also avoids the impact of the low-insulation hydrogen production unit and power generation unit on the insulation performance of the bus, further improving the operational reliability of the combined heat and power system.

[0038] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A poly-generation system electrical architecture, characterized in that, The architecture includes: a photovoltaic unit, an energy storage unit, a hydrogen cogeneration unit, and a hydrogen and oxygen supply unit; The photovoltaic unit is used to convert solar energy into electrical energy; The energy storage unit is used to store the electrical energy generated by the photovoltaic unit; The hydrogen and oxygen supply unit is used to generate hydrogen and oxygen through water electrolysis technology. The hydrogen-powered combined heat and power unit is used to provide heat energy to users; The photovoltaic unit is electrically connected to the hydrogen production power supply of the hydrogen-oxygen supply unit, the energy storage unit, and the hydrogen cogeneration unit via the DC bus side of the photovoltaic-energy storage integrated unit in the hydrogen-oxygen supply unit. The photovoltaic unit is electrically connected to the grid-connected terminal via the AC bus side of the integrated photovoltaic and energy storage unit.

2. A poly-generation system electrical architecture according to claim 1, characterized in that, The hydrogen and oxygen supply unit includes the integrated photovoltaic and energy storage unit, the hydrogen production power supply, the hydrogen production system, and the oxygen production system. The oxygen generation system is used to provide oxygen to users.

3. A poly-generation system electrical architecture according to claim 2, wherein, The combined heat and power system also includes a power distribution control unit, which is electrically connected to the AC bus side of the photovoltaic-storage integrated machine. The power distribution control unit is used to control the hydrogen production system and the oxygen production system to generate corresponding hydrogen and oxygen.

4. A poly-generation system electrical architecture according to claim 3, wherein, When the integrated photovoltaic and energy storage unit provides power support through the DC bus side and the AC bus side, it prioritizes providing power distribution support for the hydrogen cogeneration unit, the energy storage unit, the hydrogen production power source, and the power distribution control unit to ensure the stability of multi-energy output.

5. The poly-generation system electrical architecture of claim 1, wherein, Both the hydrogen production power supply and the photovoltaic-storage integrated unit adopt an electrical isolation mode to prevent mutual interference between the DC bus side and the AC bus side.

6. The poly-generation system electrical architecture of claim 1, wherein, The hydrogen cogeneration unit uses hydrogen produced by the hydrogen-oxygen supply unit as an energy source to generate electricity.

7. A poly-generation system electrical architecture according to claim 6, wherein, The hydrogen-powered combined heat and power unit also utilizes the waste heat from the power generation process to provide thermal energy to users.

8. The poly-generation system electrical architecture of claim 1, wherein, The power output terminal of the photovoltaic unit is connected to the photovoltaic side of the integrated photovoltaic and energy storage machine to transfer the power converted by the photovoltaic unit to the integrated photovoltaic and energy storage machine.

9. A poly-generation system electrical architecture according to claim 8, wherein, The energy storage side of the photovoltaic-energy storage integrated machine is connected to the energy storage unit, the hydrogen cogeneration unit, and the power source of the hydrogen production power supply, so that the energy storage unit, the hydrogen cogeneration unit, and the power source of the hydrogen production power supply can obtain the electrical energy converted by the photovoltaic unit.

10. The poly-generation system electrical architecture of claim 1, wherein, The integrated photovoltaic and energy storage unit is used to simultaneously provide power supply support for the loads on both the DC bus side and the AC bus side.

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