Device and method for power transmission and distribution of MW-grade hydrogen energy storage power generation system

Abstract

The invention discloses a power transmission and distribution device and method for an MW-level hydrogen energy storage power generation system, the device comprises a container system and a peripheral system, the peripheral system comprises a system DC / DC, a lithium battery energy storage electric cabinet and a plurality of charging piles, the DC / DC system is connected with the lithium battery energy storage electric cabinet, and the plurality of charging piles are connected with the lithium battery energy storage electric cabinet. A plurality of independent electric pile power generation systems, a plurality of independent electric pile DC / DC and a confluence cabinet are arranged in the container system, each independent electric pile DC / DC is provided with one independent electric pile power generation system, and the technical scheme improves the overall power transmission and distribution efficiency of the system. According to the technical scheme, the system operation stability and the system response speed are improved.

Description

Technical Field

[0001] The present invention belongs to the field of hydrogen fuel cell power generation, and more specifically, relates to a device and method for power transmission and distribution of a MW-level hydrogen energy storage power generation system. Background Art

[0002] Among new energy sources, hydrogen energy has obvious characteristics and advantages. Hydrogen is light in weight and has high energy density per unit weight. Hydrogen can be produced by electrolyzing water and converted into water for pollution-free recycling. Hydrogen can be stored and transported through hydrogen bottles or pipelines, and hydrogen fuel cells can be used for electricity generation. It can be seen that the entire hydrogen energy industry chain can be pollution-free and is an ideal energy source for future development.

[0003] The hydrogen fuel cell power generation system outputs direct current. In order to meet the power supply requirements of its own auxiliary system BOP, each power generation subsystem will be separately configured with a DCDC. In general, when the load is a lithium battery energy storage cabinet, the electricity generated by the fuel cell needs to be converted in the DC / AC and AC / DC links to meet the voltage requirements of the load. In this process, the conversion of electricity not only requires investment in hardware costs, but also reduces the overall efficiency of the system. This solution takes into account that the system power conversion process is all DC, so it is converged after the DC power output of the battery stack. By configuring DC for the load to convert the power demand, the AC conversion in the middle link is eliminated, which improves the overall efficiency of the system while saving hardware investment. Summary of the invention

[0004] Purpose of the invention: To address the problems of low power conversion efficiency and high hardware investment in fuel cell power generation output, this technical solution adopts a confluence plus DC conversion method to directly supply DC power to the load, omitting the intermediate conversion link and improving the overall power transmission efficiency.

[0005] Technical solution: In order to achieve the above-mentioned invention purpose, the present invention provides a device for power transmission and distribution of a MW-level hydrogen energy storage power generation system, including a container system and a peripheral system. The peripheral system includes a system DC / DC, a lithium battery energy storage cabinet and a plurality of charging piles. The DC / DC system is connected to the lithium battery energy storage cabinet, and the plurality of charging piles are connected to the lithium battery energy storage cabinet. The container system is provided with a plurality of independent battery stack power generation systems, a plurality of independent battery stack DC / DCs and a junction cabinet. Each independent battery stack DC / DC is configured with an independent battery stack power generation system. Each independent battery stack power generation system independently controls the connected independent battery stack DC / DC to realize the control of power change output. Each independent battery stack DC / DC is connected to the junction cabinet.

[0006] The functions of each module are as follows:

[0007] Fuel cell power generation system: It is a system that chemically reacts the hydrogen supplied by the BOP system with air to output direct current.

[0008] Battery stack DC / DC: The power output by the battery stack is direct current. After the DCDC is boosted, part of it is provided to the BOP for consumption, and the excess power is output and converged.

[0009] Combiner cabinet: collects the direct current output by the DCDC stack.

[0010] System DCDC: Converts the DC power after convergence to match the voltage requirement of the load system.

[0011] Lithium battery energy storage cabinet: As a load, it stores the system's electricity and then uses it for charging at the charging station.

[0012] Charging station: system load, consuming the power generated by the system.

[0013] There are at least two charging piles, and each charging pile is independently connected to a lithium battery energy storage cabinet.

[0014] A method for power transmission and distribution of a MW-class hydrogen energy storage power generation system is applied to the transmission and distribution of electric energy generated by a fuel cell stack: the method comprises the following steps:

[0015] A. Set up several independent battery stack power generation systems, which generate direct current.

[0016] B. Each independent battery stack power generation system is equipped with an independent battery stack DC / DC to achieve power change output, and the direct current is converted into DCDC in the battery stack DC / DC;

[0017] C. The electric energy after DCDC conversion is fed into the combiner cabinet;

[0018] D. The combiner cabinet is connected to the system DCDC of the peripheral system, and the system DCDC converts the current into the DC power required by the load end;

[0019] E. The direct current obtained in step D enters the lithium battery energy storage cabinet and is distributed to each independent charging pile through the lithium battery energy storage cabinet.

[0020] The device is applied to power transmission and distribution of MW-level hydrogen energy storage power generation system.

[0021] Beneficial effects: Compared with the traditional technical solution, the beneficial effects of the present invention are as follows:

[0022] (1) This technical solution improves the overall power transmission and distribution efficiency of the system.

[0023] (2) This technical solution improves the stability of system operation and the system response speed.

[0024] (3) This technical solution reduces the hardware cost investment in the intermediate links. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of a device for power transmission and distribution of a MW-level hydrogen energy storage power generation system of the present invention.

[0026] Figure 2 It is a schematic diagram of the process of the present invention. DETAILED DESCRIPTION

[0027] The present technical solution is described in detail below through a best embodiment, but the protection scope of the present invention is not limited to the embodiment.

[0028] like Figure 1 As shown, a device for power transmission and distribution of a MW-level hydrogen energy storage power generation system includes a container system and a peripheral system. The peripheral system includes a system DC / DC4, a lithium battery energy storage cabinet 5 and a plurality of charging piles 6. The DC / DC system 4 is connected to the lithium battery energy storage cabinet 5, and the plurality of charging piles 6 are all connected to the lithium battery energy storage cabinet 5. A plurality of independent battery stack power generation systems 1, a plurality of independent battery stack DC / DC2 and a junction cabinet 3 are arranged in the container system. Each independent battery stack DC / DC2 is equipped with an independent battery stack power generation system 1. Each independent battery stack power generation system 1 independently controls the connected independent battery stack DC / DC2 to realize the control of power change output. Each independent battery stack DC / DC2 is connected to the junction cabinet 3.

[0029] The functions of each module are as follows:

[0030] Fuel cell power generation system: It is a system that chemically reacts the hydrogen supplied by the BOP system with air to output direct current.

[0031] Battery stack DC / DC: The power output by the battery stack is direct current. After the DCDC is boosted, part of it is provided to the BOP for consumption, and the excess power is output and converged.

[0032] Combiner cabinet: collects the direct current output by the DCDC stack.

[0033] System DCDC: Converts the DC power after convergence to match the voltage requirement of the load system.

[0034] Lithium battery energy storage cabinet: As a load, it stores the system's electricity and then uses it for charging at the charging station.

[0035] Charging station: system load, consuming the power generated by the system.

[0036] There are at least two charging piles, and each charging pile is independently connected to a lithium battery energy storage cabinet.

[0037] A method for power transmission and distribution of a MW-level hydrogen energy storage power generation system is applied to the transmission and distribution of electric energy generated by a fuel cell stack, and the method comprises the following steps:

[0038] A. Set up several independent battery stack power generation systems, which generate direct current.

[0039] B. Each independent battery stack power generation system is equipped with an independent battery stack DC / DC to achieve power change output, and the direct current is converted into DCDC in the battery stack DC / DC;

[0040] C. The electric energy after DCDC conversion is fed into the combiner cabinet;

[0041] D. The combiner cabinet is connected to the system DCDC of the peripheral system, and the system DCDC converts the current into the DC power required by the load end;

[0042] E. The direct current obtained in step D enters the lithium battery energy storage cabinet and is distributed to each independent charging pile through the lithium battery energy storage cabinet.

[0043] The method is applied to power transmission and distribution of a MW-level hydrogen energy storage power generation system.

[0044] like Figure 2 As shown, in actual operation, after receiving the power generation instruction, the power generation system starts the BOP and the stack's own status self-check and enters the standby state. When the load issues a response demand, the system gives a start command, and after detecting the status of the entire system, the equipment starts. The BOP system supplies hydrogen and air in response to the demand, and the stack generates electricity and converts and transmits electricity through DCDC. Part of the electricity is used for its own BOP consumption, and the excess is transmitted to the junction cabinet for collection. After that, the power output by the junction cabinet is transmitted to the system DCDC. The system DCDC changes the voltage according to the load demand to meet the load demand. While meeting the load consumption of the charging pile, the excess electricity can also be stored in the lithium battery cabinet. When the fuel cell system is not in working state, the lithium battery energy storage cabinet can also provide corresponding power for the load to meet the power demand of the system in multiple periods.

[0045] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A device for power transmission and distribution of a MW-class hydrogen energy storage power generation system, comprising a container system and a peripheral system, wherein the peripheral system comprises a system DC / DC (4), a lithium battery energy storage cabinet (5) and a plurality of charging piles (6), wherein the DC / DC system (4) is connected to the lithium battery energy storage cabinet (5), and the plurality of charging piles (6) are all connected to the lithium battery energy storage cabinet (5), characterized in that: The container system is provided with a plurality of independent battery stack power generation systems (1), a plurality of independent battery stack DC / DCs (2) and a junction box (3), each of the independent battery stack DC / DCs (2) is equipped with an independent battery stack power generation system (1), each independent battery stack power generation system (1) independently controls the connected independent battery stack DC / DC (2) to realize the control of power output, and each independent battery stack DC / DC (2) is connected to the junction box (3).

2. A device for power transmission and distribution of a MW-class hydrogen energy storage power generation system, characterized in that: The plurality of charging piles (6) is at least two, and each charging pile (6) is independently connected to the lithium battery energy storage cabinet (5).

3. A method for power transmission and distribution of a MW-level hydrogen energy storage power generation system, applied to the transmission and distribution of power generated by a fuel cell stack, characterized in that: The method comprises the following steps: A. Set up several independent battery stack power generation systems, which generate direct current. B. Each independent battery stack power generation system is equipped with an independent battery stack DC / DC to achieve power change output, and the direct current is converted into DCDC in the battery stack DC / DC; C. The electric energy after DCDC conversion is fed into the combiner cabinet; D. The combiner cabinet is connected to the system DCDC of the peripheral system, and the system DCDC converts the current into the DC power required by the load end; E. The direct current obtained in step D enters the lithium battery energy storage cabinet and is distributed to each independent charging pile through the lithium battery energy storage cabinet.

4. A method for power transmission and distribution of a MW-level hydrogen energy storage power generation system according to claim 3, characterized in that: The method is applied to power transmission and distribution of a MW-level hydrogen energy storage power generation system.

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