A hydrogen energy power supply system for in-plant power consumption of a power plant

Abstract

This invention relates to a hydrogen-powered power supply system for power plants, comprising an AC system, a DC system, and a UPS system. The hydrogen-powered power supply system includes a hydrogen supply component, a PEMFC fuel cell unit, a DC-DC converter, and an inverter. The hydrogen supply component is connected to the PEMFC fuel cell unit. The PEMFC fuel cell unit is connected to the DC-DC converter via cables. The DC-DC converter is connected to both the DC system and the UPS system via cables. The PEMFC fuel cell unit is connected to the inverter via cables. The inverter is connected to both the AC system and the UPS system via cables. This hydrogen-powered power supply system improves the sophistication, stability, and safety of power supply within power plants, while reducing carbon emissions and environmental pollution.

Description

Technical Field

[0001] This invention relates to the field of power generation, and more specifically to a hydrogen energy power supply system for use in power plants. Background Technology

[0002] Within the power plant, a power supply system needs to be installed to supply power to the station's electrical loads. See Appendix. Figure 1 As shown, the power load within the power station mainly includes station AC system 1 (for powering certain AC equipment within the power station), station DC system 3 (for powering certain DC equipment within the power station), UPS system 2, and a backup power system. In existing power stations, traditional diesel generators and batteries provide power to station AC system 1, station DC system 3, and UPS system 2. However, the charging and discharging process of batteries is complex, and the maintenance and repair of individual cells within the battery bank are inconvenient, resulting in poor stability and safety. Furthermore, diesel generators also pose problems of carbon emissions and environmental pollution. With technological advancements and increasingly stringent environmental requirements, power stations urgently need a new power supply system to ensure the advanced nature, stability, and safety of power supply within the station, while reducing carbon emissions and environmental pollution. Summary of the Invention

[0003] In view of the shortcomings of the prior art described above, the technical problem to be solved by the present invention is to provide a hydrogen energy power supply system for power plants, which can improve the advancement, stability and safety of power supply in power plants, and reduce carbon emissions and environmental pollution.

[0004] To achieve the above objectives, the present invention provides a hydrogen energy power supply system for power generation in a power plant. The power supply includes a station AC system, a station DC system, and a UPS system. The hydrogen energy power supply system includes a hydrogen energy supply component, a PEMFC fuel cell device, a DC converter, and an inverter. The hydrogen energy supply component is connected to the PEMFC fuel cell device. The PEMFC fuel cell device is connected to the DC converter via a cable. The DC converter is connected to both the station DC system and the UPS system via cables. The PEMFC fuel cell device is connected to the inverter via a cable. The inverter is connected to both the station AC system and the UPS system via cables.

[0005] Furthermore, the hydrogen supply component includes an on-site hydrogen storage device, which is connected to the PEMFC fuel cell unit for hydrogen supply.

[0006] Furthermore, the hydrogen storage device in the station is equipped with a real-time hydrogen content monitoring mechanism.

[0007] Furthermore, the hydrogen supply component includes a water electrolysis PEM hydrogen production device and a rectifier. The water electrolysis PEM hydrogen production device is connected to a PEMFC fuel cell device for hydrogen supply. The rectifier is connected to the station's AC system via a cable and is also connected to the water electrolysis PEM hydrogen production device via a cable, providing DC power to the water electrolysis PEM hydrogen production device.

[0008] Furthermore, the electrolytic water PEM hydrogen production unit is connected to the on-site hydrogen storage unit.

[0009] Furthermore, it also includes a hydrogen-to-electricity switching switch connected to the inverter cable, which is connected to the station AC system and the UPS system via cables respectively; the station AC system is also used to connect to an external power source.

[0010] Furthermore, it also includes a first series line connecting the station's AC system and the station's DC system, and a second series line connecting the station's AC system and the UPS system, wherein the first series line has a rectifier.

[0011] Furthermore, it also includes a hydrogen-electric AC safety busbar, which is connected to a hydrogen-electric switching switch via a cable. The hydrogen-electric AC safety busbar is also connected to the station's AC system and UPS system via cables, and is also used to connect to the safety power supply load.

[0012] Furthermore, the station AC system includes an internal AC bus, which is connected to the hydrogen-electric AC safety bus via a cable. The internal AC bus is also connected to both the station DC system and the UPS system via cables.

[0013] Furthermore, an isolation transformer is provided between the inverter and the hydrogen-to-electricity switching switch.

[0014] As described above, the hydrogen-powered power supply system of the present invention has the following beneficial effects:

[0015] By configuring a hydrogen supply component, a PEMFC fuel cell unit, a DC-DC converter, and an inverter, the hydrogen supply component provides hydrogen to the PEMFC fuel cell unit, which then generates DC power through a reaction. On one hand, the DC power is converted to AC power by the DC-DC converter and then supplied to the station's DC power system and UPS system. On the other hand, the AC power is converted to AC power by the inverter and then supplied to the station's AC power system and UPS system, thus providing power for the power plant. This hydrogen power supply system of the present invention uses PEMFC fuel cell (proton exchange membrane fuel cell) technology as its power source. It has advantages such as fast start-up speed, fast dynamic response speed, high specific power and specific energy, long equipment life, and high equipment stability. It is also easy to assemble and manage, and its maintenance is relatively simple. This system can improve the sophistication, stability, and safety of power supply within the power plant, while reducing carbon emissions and environmental pollution. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the hydrogen energy power supply system of the present invention.

[0017] Component designation explanation

[0018] 1 Station Communication System

[0019] 1a Station AC bus

[0020] 1b Substation

[0021] 2 UPS system

[0022] 3-station DC system

[0023] 4 PEMFC fuel cell devices

[0024] 5. DC-DC converter

[0025] 6 Inverter unit

[0026] 7. Isolation Transformer

[0027] 8. Hydrogen-to-electricity switching switch

[0028] 9. On-site hydrogen storage devices

[0029] 10. Electrolytic water PEM hydrogen production unit

[0030] 11 Rectifier

[0031] 12 First series circuit

[0032] 12A rectifier

[0033] 13 Second series circuit

[0034] 14 Hydrogen-electric AC safety busbar

[0035] 15 External hydrogenation unit Detailed Implementation

[0036] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0037] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings of this specification are merely for illustrative purposes to aid those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effects and objectives achieved by the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and are not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0038] See Figure 1 This invention provides a hydrogen-powered power supply system for power generation in a power plant. The power supply includes an AC system 1, a DC system 3, and a UPS system 2. The AC system 1 supplies power to various AC-powered devices within the power plant, the DC system 3 supplies power to various DC-powered devices, and the UPS system requires both DC and AC power. The hydrogen-powered power supply system includes a hydrogen supply component, a PEMFC fuel cell device 4, a DC-DC converter 5, and an inverter 6. The hydrogen supply component and the PEMFC fuel cell device 4 are connected via a gas pipeline. The PEMFC fuel cell device 4 and the DC-DC converter 5 are connected via cables. The DC-DC converter 5 is connected via cables to both the DC system 3 and the UPS system 2. The PEMFC fuel cell device 4 and the inverter 6 are connected via cables. The inverter 6 is connected via cables to both the AC system 1 and the UPS system 2.

[0039] The main working principle of the hydrogen energy power supply system involved in this invention is as follows: the hydrogen supply component provides hydrogen to the PEMFC fuel cell device 4, and the PEMFC fuel cell device 4 generates direct current (DC) electricity through reaction. On one hand, after passing through the DC-DC converter 5, the DC power is sent to the station's DC system 3 and UPS system 2 for power supply; on the other hand, the DC power is inverted by the inverter 6 and sent to the station's AC system 1 and UPS system 2 for power supply, thereby realizing the power supply for the power plant. The hydrogen energy power supply system of this invention uses PEMFC fuel cell (proton exchange membrane fuel cell) technology as the power source, which has advantages such as fast start-up speed, fast dynamic response speed, high specific power and specific energy, long equipment life, and high equipment stability. It is also easy to assemble and relatively simple to manage and maintain. It can be used as the power supply system within the power plant, which can improve the advancement, stability, and safety of the power supply within the station, and reduce carbon emissions and environmental pollution.

[0040] See Figure 1 The present invention will be further described below with reference to a specific embodiment:

[0041] In this embodiment, see Figure 1 As a preferred design, the hydrogen energy supply component includes two parts. One part is an in-station hydrogen storage device 9, which is connected to the PEMFC fuel cell device 4 to provide hydrogen to the PEMFC fuel cell device 4. The in-station hydrogen storage device 9 can be supplemented with hydrogen through an external hydrogen refueling device 15 as an external input energy source for the PEMFC fuel cell device 4. Preferably, the in-station hydrogen storage device 9 is equipped with a real-time hydrogen content monitoring mechanism to ensure that the hydrogen content can meet the requirements. The other part is on-site hydrogen production, including a PEM (Polymer Electrolysis Method) hydrogen production unit 10 and a hydrogen rectifier 11. The PEM hydrogen production unit 10 is connected to the PEMFC (Polymerized Electricity Extraction Machine) fuel cell unit 4 for hydrogen supply. Preferably, the PEM hydrogen production unit 10 is also connected to the on-site hydrogen storage unit 9 to store excess hydrogen produced. The rectifier 11 is connected to the station's AC system 1 via a cable, and the rectifier 11 is also connected to the PEM hydrogen production unit 10 via a cable. The rectifier 11 converts AC power to DC power to supply DC power to the PEM hydrogen production unit 10. By utilizing the electrical energy of the station's AC system 1 during operation, hydrogen production is achieved through water electrolysis, making full use of electrical energy and obtaining a continuous supply of hydrogen energy. Under certain conditions, commercial output can also be realized. PEM water electrolysis hydrogen production technology has advantages such as high electrolysis efficiency, high product purity, compact equipment structure, and clean and environmentally friendly operation, improving the safety and environmental friendliness of on-site power supply.

[0042] In this invention, the long-term permissible power generation capacity of the PEMFC fuel cell device 4 should be able to meet the minimum continuous operation load requirements for safe shutdown of the power station. The hydrogen storage capacity of the on-site hydrogen storage device 9 should meet the power demand for 120 minutes of on-site safety load, and the discharge capacity of the motor starting current and other inrush load currents should be verified. The water electrolysis PEM hydrogen production device 10 and the PEMFC fuel cell device 4 can be uniformly arranged in the on-site hydrogen energy integrated room. The on-site hydrogen storage device 9 can adopt advanced hydrogen storage devices such as high-pressure hydrogen storage tanks or solid-state hydrogen storage devices. The equipment layout of the hydrogen energy supply components should meet the requirements of the specifications for fire prevention, explosion prevention, and overvoltage protection of hydrogen stations.

[0043] In this embodiment, see Figure 1 As a preferred design, the hydrogen power supply system also includes a hydrogen-to-electricity switching switch 8 connected to the inverter 6 via a cable, and an isolation transformer 7 is provided between the inverter 6 and the hydrogen-to-electricity switching switch 8. The inverter 6 inverts the DC output of the PEMFC fuel cell device 4 into a 380V three-phase AC output, and the isolation transformer 7 isolates overvoltage and suppresses high-frequency noise input, ensuring that the generated AC power safely and stably supplies power to the station AC system 1. The hydrogen-to-electricity switching switch 8 is connected to the station AC system 1 and the UPS system 2 via cables respectively; the station AC system 1 is connected to an external power source (e.g., the low-voltage side of the step-up substation within the power plant). Furthermore, the hydrogen power supply system also includes a first series line 12 connecting the station AC system 1 and the station DC system 3, and a second series line 13 connecting the station AC system 1 and the UPS system 2. The first series line 12 includes a rectifier 12a. At this time, the hydrogen power supply system can serve as a backup power supply system for the station's AC system 1. During normal operation, the hydrogen-to-electricity switching switch 8 is open, and the hydrogen power supply system is in standby mode, not supplying power to the station's AC system 1, but only supplying power to the station's DC system 3 and UPS system 2. Power is supplied to the station's AC system 1 from an external power source. Simultaneously, the station's AC system 1 supplies power to the station's DC system 3 through the first series line 12, where the rectifier 12a converts the power to DC. That is, the station's DC system 3 has two power inputs. The station's DC system 3 has a built-in switching switch and interlocking device to switch between the two power inputs, thereby ensuring the stability and reliability of DC power supply within the station. The station's AC system 1 also provides AC power to the UPS system 2 through the second series line 13. After the external power source fails, the hydrogen-to-electricity switching switch 8 is closed, and the hydrogen power supply system supplies power to the station's AC system 1.

[0044] In this embodiment, see Figure 1The station AC system 1 includes an internal AC bus 1a, which is connected to an external power source via an internal substation 1b. The internal AC bus 1a is used to supply power to various AC loads. Of course, the station AC system 1 can also adopt other structural forms. Preferably, in this embodiment, the hydrogen energy power supply system also includes a hydrogen-electric AC safety bus 14, which is connected to a hydrogen-electric switching switch 8 via a cable. The internal AC bus 1a is connected to the station DC system 3 and the UPS system 2 via cables. AC power from the inverter 6 is delivered to the station AC system 1 and the UPS system 2 via the hydrogen-electric AC safety bus 14. The remaining feeders of the hydrogen-electric AC safety bus 14 are used to connect to the safety power loads, serving as the power supply center for the power station's safety power loads. The internal AC bus 1a in the station AC system 1 consists of two sections, each connected to an external power source via two internal substations 1b to supply power to the internal AC bus 1a. The hydrogen-electric AC safety busbar 14 is bridging the two low-voltage busbars used for power supply at the station.

[0045] In this embodiment, the station DC system 3 is powered by two DC power sources, namely the DC converter 5 and the first series line 12. The two power inputs are reliably supplied to the DC system via switching and interlocking devices within the station DC system 3. The station DC system 3 can be configured with two DC bus sections according to system requirements. Each DC bus section has two power inputs, as described above. It is important to ensure that different DC bus sections are connected to different AC bus sections 1a within the station. For large and medium-sized power plants and important substations, multiple DC power sources are generally required. In this case, multiple PEMFC fuel cell units 4 can provide dedicated DC main power to the control loads or power loads required by the station DC system 3.

[0046] In this embodiment, see Figure 1 UPS system 2 has three power sources: AC main power, AC bypass power, and DC power, drawn from the hydrogen power AC safety bus 14, the station's AC bus 1a, and the DC-DC converter 5, respectively. These three power inputs ensure uninterrupted power supply to the UPS bus via switching devices and interlocking mechanisms within UPS system 2. UPS system 2 can be configured with two bus sections according to system requirements. Each bus section has three power inputs, as described above. It is important to ensure that different UPS bus sections are connected to different station AC bus 1a sections. The switching devices within UPS system 2 typically include an isolation transformer 7, which can regulate and control voltage and frequency stability, as well as harmonic distortion.

[0047] As can be seen from the above, the hydrogen-powered power supply system in this embodiment has the following advantages:

[0048] 1. By utilizing PEM hydrogen production technology and PEMFC fuel cell power generation technology, the mutual conversion of hydrogen energy and electrical energy can be realized. This can replace the batteries and diesel generators of traditional power plants, providing a stable and fast power source for the station's AC system 1, DC system 3, and UPS system 2. The hydrogen power supply system based on PEM technology is an important direction for the development of my country's hydrogen energy industry and also contributes to the development and transformation of my country's energy structure.

[0049] 2. The PEMFC fuel cell device produces clean and pollution-free emissions, achieving zero carbon emissions; hydrogen can easily and quickly escape in the open atmosphere, reducing the risk of fire spread; the thermal radiation rate of hydrogen flame is low, and the damage to electrical equipment and station buildings is lower than that of diesel combustion.

[0050] 3. Traditional power plants have complex charging and discharging methods for their battery systems, and the maintenance of individual cells within the battery pack is not very convenient. In contrast, the PEMFC fuel cell device 4 in this hydrogen energy power supply system has a fast start-up speed and dynamic response speed, high specific power and specific energy, long equipment life, high equipment stability, and is easy to assemble, manage, and maintain, making it suitable as a backup power source in power plants.

[0051] In conclusion, the invention effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0052] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A hydrogen energy power supply system for station on-site power of a power plant, the station on-site power comprising a station AC system (1), a station DC system (3), and a UPS system (2), characterized by: The hydrogen power supply system includes a hydrogen supply component, a PEMFC fuel cell device (4), a DC converter (5), and an inverter (6). The hydrogen supply component is connected to the PEMFC fuel cell device (4). The PEMFC fuel cell device (4) is connected to the DC converter (5) via a cable. The DC converter (5) is connected to the station DC system (3) and the UPS system (2) via cables. The PEMFC fuel cell device (4) is connected to the inverter (6) via a cable. The inverter (6) is connected to the station AC system (1) and the UPS system (2) via cables. The system also includes a hydrogen-electric switching switch (8) connected to the inverter (6) via a cable. The hydrogen-electric switching switch (8) is connected to the station AC system (1) and the UPS system (2) via cables. The station AC system (1) is also used to connect to an external power source. The system also includes a first series line (12) connecting the station AC system (1) and the station DC system (3), and a line connecting the station AC system (1) and the DC system (3). The UPS system (2) has a second series line (13), and the first series line (12) has a rectifier (12a); an isolation transformer (7) is provided between the inverter (6) and the hydrogen-electric switching switch (8); it also includes a hydrogen-electric AC safety bus (14), which is connected to the hydrogen-electric switching switch (8) via a cable, and is connected to the station AC system (1) and the UPS system (2) via cables respectively. It is also used to connect to the power load of the security power supply; the station AC system (1) has an in-station AC bus (1a), the in-station AC bus (1a) is connected to the hydrogen AC security bus (14) by a cable, and the in-station AC bus (1a) is connected to the station DC system (3) and the UPS system (2) by a cable; the station DC system (3) is configured with two DC bus sections, each DC bus section has two power supply lines, and different DC bus sections are connected to different in-station AC bus (1a).

2. The hydrogen energy power supply system according to claim 1, characterized by: The hydrogen supply component includes an on-site hydrogen storage device (9), which is connected to the PEMFC fuel cell device (4) for hydrogen supply.

3. The hydrogen energy power supply system according to claim 2, characterized by: The hydrogen storage device (9) in the station is equipped with a real-time hydrogen content monitoring mechanism.

4. The hydrogen energy power supply system according to claim 2, characterized by: The hydrogen supply components include a water electrolysis PEM hydrogen production device (10) and a rectifier (11). The water electrolysis PEM hydrogen production device (10) is connected to the PEMFC fuel cell device (4) for hydrogen supply. The rectifier (11) is connected to the station AC system (1) via a cable. The rectifier (11) is connected to the water electrolysis PEM hydrogen production device (10) via a cable and provides DC power to the water electrolysis PEM hydrogen production device (10).

5. The hydrogen energy power supply system according to claim 4, characterized by: The electrolytic water PEM hydrogen production device (10) is connected to the on-site hydrogen storage device (9).

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