A substation intelligent microgrid control system

Abstract

The application relates to a substation intelligent micro-grid control system applied to the power distribution field, corresponding level power supply clusters are respectively arranged for different priority load components, one-to-one power supply to the load components is realized, the key load can be continuously operated, dynamic load demand can be adapted, power supply to the non-key load components can be realized at necessary moments, hydrogen energy transportation between multiple micro-grid subsystems can be realized through the setting of a hydrogen transportation pipeline in the power supply process of the micro-grid subsystem, the power supply time to the load components is effectively prolonged, in addition, through the setting of the specific structure of the hydrogen transportation pipeline, the hydrogen transportation pipeline has the hydrogen leakage monitoring function on the basis of meeting the bidirectional hydrogen transportation demand, the internal hydrogen transportation area is replaced after the leakage point is monitored, hydrogen transported subsequently is not easy to continuously overflow from the leakage point, and the normal use of the hydrogen transportation pipeline is effectively ensured before on-site maintenance of personnel.

Description

TECHNICAL FIELD

[0001] The present application relates to a control system, in particular to a substation intelligent micro-grid control system applied to the power distribution field. BACKGROUND

[0002] The micro-grid refers to a small-scale power generation and distribution system formed by distributed power sources, energy storage devices, energy conversion devices, related loads and monitoring and protection devices. The power sources in the micro-grid are mostly small-capacity distributed power sources, i.e. small units with power electronic interfaces, including micro-turbines, fuel cells, photovoltaic cells, small wind turbine generators and energy storage devices such as super capacitors, flywheels and batteries.

[0003] The station power source (station power system) is a system for supplying power to various power loads inside the substation, and is an important link to ensure the safe and reliable operation of the substation. Once the station power system fails, it will affect the safety and stability of the substation, and even cause system power failure, equipment damage and other accidents, and in severe cases, cause the entire substation to lose voltage, bringing great challenges to the safe and stable operation of the power grid.

[0004] Chinese patent CN115102153B discloses a substation station power light hydrogen storage micro-grid and a control method thereof. The micro-grid connects electric vehicle charging piles on the DC bus to realize energy interaction between electric vehicles and the micro-grid. Battery energy storage-hydrogen energy storage is used as a hybrid energy storage method to realize short-term and long-term power supply. The control method ensures the power supply reliability and economy of the station daily load through photovoltaic power generation and hybrid energy storage system when the substation station power supply is normal. When the substation station power supply fails, the micro-grid operates off-grid, discharges the battery for a short time and discharges the hydrogen energy storage for a long time to ensure the power supply reliability of the key load in the station.

[0005] In the prior art, when the substation power supply fails due to a fault or the power transmission line fails, an emergency power supply is generally used to supply power to the key load to ensure stable operation of the key load. However, this method cannot cope with dynamic load changes, and it is difficult to supply power to non-key loads in time to meet temporary emergency needs when the non-key loads need to be urgently started. SUMMARY

[0006] In view of the above prior art, the technical problem to be solved by the present application is that the emergency power supply in the existing substation generally supplies power to the key load, which is difficult to cope with dynamic load changes and the dynamic starting needs of non-key loads, and has the defect of insufficient emergency adjustment capability.

[0007] To solve the above problems, the application provides a substation intelligent micro-grid control system, which comprises a plurality of power supply clusters, each power supply cluster comprises a plurality of micro-grid subsystems, the plurality of power supply clusters supply power to different load components respectively, the plurality of power supply clusters are divided in order from high to low according to levels, the higher the level of the power supply cluster is, the higher the priority of the corresponding load component is, and the level of the micro-grid subsystem is the same as the level of the power supply cluster to which the micro-grid subsystem belongs;

[0008] One micro-grid subsystem is selected from each power supply cluster, and a plurality of micro-grid subsystems of different levels jointly form a cascade energy supply network, and a hydrogen pipeline is connected between adjacent level micro-grid subsystems in the cascade energy supply network;

[0009] The micro-grid subsystem comprises a power generation module, an energy storage module, a power supply module and a water electrolysis hydrogen production module, the power supply module supplies power to the corresponding load component, the power generation module comprises a photovoltaic power generation unit and a hydrogen fuel cell, the hydrogen fuel cell comprises a hydrogen tank for storing hydrogen, the hydrogen produced by the water electrolysis hydrogen production module is stored in the hydrogen tank, and the hydrogen pipeline is used for connecting the hydrogen tanks of different micro-grid subsystems.

[0010] A method for using the substation intelligent micro-grid control system comprises the following steps:

[0011] S1, under normal circumstances, all load components in the substation are supplied with power by a station power supply, a photovoltaic power generation unit converts light energy into electric energy and stores the electric energy in an energy storage module, and a water electrolysis hydrogen production module is not started under the condition that the energy storage module is not full of electricity;

[0012] S2, when the energy storage module is full of electricity and the external light energy is sufficient, the water electrolysis hydrogen production module is started, surplus electric energy generated by the photovoltaic power generation module is used to perform water electrolysis hydrogen production operation, and the generated hydrogen is stored in a hydrogen tank;

[0013] S3, when the station power supply is powered off, high-level power supply clusters corresponding to load components with high priority are automatically used to supply power, and low-level power supply clusters corresponding to load components with low priority are used to supply power when the load components with low priority receive an enabling demand;

[0014] S4, when a micro-grid subsystem a in the high-level power supply cluster has a power shortage, hydrogen in a low-level micro-grid subsystem is transported to the micro-grid subsystem a through a hydrogen pipeline, the micro-grid subsystem a generates power through a hydrogen fuel cell and continuously supplies power to the load components, and the low-level micro-grid subsystem meets the following conditions: one, the low-level micro-grid subsystem belongs to the same cascade energy supply network as the micro-grid subsystem a, and two, the corresponding load component is in a non-running state;

[0015] S5, when the remaining hydrogen content of the low-level micro-grid subsystem available for hydrogen supply in the same step energy supply network is lower than the set value, starting the water electrolysis hydrogen production module in the low-level micro-grid subsystem, producing hydrogen by consuming the electric energy in the energy storage module, and continuing to deliver hydrogen to the micro-grid subsystem a through the hydrogen delivery pipeline;

[0016] S6, when the electric quantity of the energy storage module is reduced to the set reserved value, closing the corresponding water electrolysis hydrogen production module, and saving a certain amount of electric quantity to cope with the sudden activation demand.

[0017] As a further supplement to the present application, the hydrogen delivery pipeline comprises an outer pipe and a hollow semi-ring pipe located inside the outer pipe, both ends of the outer pipe are fixedly connected with end columns, the outer end of the outer pipe is paved with a sensing optical fiber, and the sensing optical fiber is spirally wound on the outer end of the outer pipe.

[0018] As a further supplement to the present application, the upper and lower inner walls of the outer pipe are fixedly connected with the partition plates, the hollow semi-ring pipe is rotatably connected between the pair of partition plates, the end column is provided with a first circular groove at one end close to the outer pipe, the first circular groove is provided with a second circular groove away from the inner wall of the outer pipe, and the second circular groove is provided with a third circular groove away from the inner wall of the outer pipe, the outer diameter of the hollow semi-ring pipe is the same as the inner diameter of the first circular groove, and the end of the hollow semi-ring pipe is rotatably connected to the inside of the first circular groove.

[0019] As a further supplement to the present application, both ends of the hollow semi-ring pipe are fixedly connected with large gears, the large gears are located inside the second circular groove, the outside of the end column is provided with a rotating rod, the outer end of the rotating rod is fixedly connected with a small gear, the small gear is engaged with the large gear, and the end of the rotating rod away from the small gear is connected with the output end of the motor through a shaft coupling.

[0020] As a further supplement to the present application, the outer end of the end column is provided with an open groove, and the open groove is communicated with the second circular groove, and the rotating rod and the small gear are located inside the open groove.

[0021] As a further supplement to the present application, the center of the end column is fixedly connected with a first connecting pipe, one end of the first connecting pipe is fixedly penetrated through the end column and communicated with the inside of the outer pipe, the outer pipe, the end column and the hollow semi-ring pipe are coaxially arranged, and the inner diameter of the first connecting pipe is smaller than the inner diameter of the hollow semi-ring pipe.

[0022] As a further supplement to the present application, the end of the end column away from the outer pipe is fixedly connected with a second connecting pipe, one end of the second connecting pipe extends to the inside of the third circular groove and is fixedly communicated with the hollow semi-ring pipe through a hose, and the hose is placed in a relaxed state in the inside of the third circular groove.

[0023] As a further supplement to the present application, the outer end of the hollow semi-ring pipe is fixedly connected with a pair of sealing rings, and the pair of sealing rings are tightly fitted with the inner walls of the pair of first circular grooves respectively.

[0024] In summary, this application divides load components into different levels based on their priority and sets up corresponding power supply clusters for load components of different priorities, achieving one-to-one power supply to load components. This not only ensures the continuous operation of critical loads but also adapts to dynamic load demands, providing power to non-critical load components when necessary. During the power supply process of the microgrid subsystem, the hydrogen transmission pipeline enables hydrogen energy transfer between multiple microgrid subsystems, effectively extending the power supply time to load components. Furthermore, the specific structure of the hydrogen transmission pipeline is designed to meet bidirectional hydrogen transmission requirements while also providing hydrogen leakage detection functionality. When a leak is detected, the internal hydrogen transmission area is replaced, preventing subsequent hydrogen transmission from overflowing from the leak point. This effectively ensures the normal operation of the hydrogen transmission pipeline before on-site maintenance by personnel. Attached Figure Description

[0025] Figure 1 The system of the first, second and third embodiments of this application Figure One ;

[0026] Figure 2 The system of the first, second and third embodiments of this application Figure Two ;

[0027] Figure 3 The system of the first, second and third embodiments of this application Figure Three ;

[0028] Figure 4 This is a perspective view of the hydrogen transport pipeline according to the third embodiment of this application;

[0029] Figure 5 This is a partial cross-sectional view of the hydrogen transport pipeline according to the third embodiment of this application;

[0030] Figure 6 Localized explosion of a hydrogen transport pipeline according to the third embodiment of this application Figure One ;

[0031] Figure 7 Localized explosion of a hydrogen transport pipeline according to the third embodiment of this application Figure Two ;

[0032] Figure 8 Localized explosion of a hydrogen transport pipeline according to the third embodiment of this application Figure Three ;

[0033] Figure 9 This is a partial top surface structure diagram of the hydrogen transport pipeline according to the third embodiment of this application;

[0034] Figure 10 This is a front view of the hydrogen transport pipeline according to the third embodiment of this application. Figure One;

[0035] Figure 11 Front view of the hydrogen pipeline of the third embodiment of the present application Figure Two ;

[0036] Figure 12 Front view of the hollow semi-ring pipe of the third embodiment of the present application when rotating

[0037] Figure 13 Front view of the hollow semi-ring pipe of the third embodiment of the present application after rotating 180°.

[0038] Explanation of the figure:

[0039] 1 outer pipe, 2 end column, 201 first circular groove, 202 second circular groove, 203 third circular groove, 204 open groove, 3 sensing optical fiber, 4 hollow semi-ring pipe, 401 sealing ring, 5 partition plate, 6 first connecting pipe, 7 second connecting pipe, 8 rotating rod, 9 small gear, 10 large gear, 11 hose. DETAILED DESCRIPTION

[0040] The three embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0041] First embodiment:

[0042] The present application provides a substation intelligent micro-grid control system, please refer to Figure 1 , comprising a plurality of power supply clusters, the power supply cluster comprising a plurality of micro-grid subsystems, the plurality of power supply clusters respectively supply power to different load components, the plurality of power supply clusters are divided in order from high to low according to the level, the higher the level of the power supply cluster, the higher the priority of the load component corresponding to it, and the level of the micro-grid subsystem is the same as the level of the power supply cluster to which it belongs;

[0043] Please refer to Figure 2 , a micro-grid subsystem is selected from each power supply cluster, a plurality of micro-grid subsystems of different levels together form a cascade energy supply network, and there is a hydrogen pipeline between the micro-grid subsystems of adjacent levels in the cascade energy supply network, in the present embodiment, the hydrogen pipeline between the micro-grid subsystems of adjacent levels is single, and only hydrogen can be transported from one micro-grid subsystem to the micro-grid subsystem of the adjacent higher level;

[0044] Please refer to Figure 3The micro-grid subsystem includes a power generation module, an energy storage module, a power supply module, and a water electrolysis hydrogen production module. The power supply module supplies power to the corresponding load components. The power generation module includes a photovoltaic power generation unit and a hydrogen fuel cell. The hydrogen fuel cell includes a hydrogen tank for storing hydrogen. The hydrogen fuel cell generates electricity using hydrogen in the hydrogen tank. The water electrolysis hydrogen production module produces hydrogen that is stored in the hydrogen tank for use by the hydrogen fuel cell. A hydrogen pipeline is used to connect the hydrogen tanks of different micro-grid subsystems. When external light energy is sufficient, the photovoltaic power generation unit generates electrical energy and stores it in the energy storage module. The power supply module can provide electrical energy from the energy storage module to the corresponding load components. When the photovoltaic power generation produces excess electrical energy (i.e., the energy storage module approaches full charge), the water electrolysis hydrogen production module can be started to produce hydrogen using the excess electrical energy from photovoltaic power generation. The produced hydrogen is stored in the hydrogen tank.

[0045] A substation intelligent micro-grid control system, the method for using the same comprising the following steps:

[0046] S1. Under normal circumstances, the station power supply supplies power to all load components in the substation. The photovoltaic power generation unit converts light energy into electrical energy and stores it in the energy storage module. When the energy storage module is not full, the water electrolysis hydrogen production module is not started.

[0047] S2. When the energy storage module is full and the external light energy is sufficient, the water electrolysis hydrogen production module is started to use the excess electrical energy generated by the photovoltaic power generation module to perform water electrolysis hydrogen production operation. The generated hydrogen is stored in the hydrogen tank, effectively solving the problem of abandoned light and producing green hydrogen using light energy.

[0048] S3. When the station power supply is powered off, the corresponding high-level power supply cluster automatically supplies power to the load components with high priority (i.e., critical load components). The load components with low priority (i.e., non-critical load components) remain in a powered-off state under normal circumstances, thereby concentrating electrical energy on critical load components.

[0049] For load components with low priority, when they receive an activation requirement, the corresponding low-level power supply cluster supplies power.

[0050] In the prior art, when the station power is powered off, the emergency power supply is generally used to provide emergency power supply for the key load, and the non-key load is in a disabled state. Although this method maintains the operation of the key load, it cannot adapt to dynamic demand. When some non-key loads need to be urgently started, the non-key loads cannot be successfully started due to the lack of power supply, thereby affecting the operation of the power system. To solve the above problems, the load is divided into different levels of load components according to the priority importance of the load, and different levels of power supply clusters are set up for different priority load components, so that one-to-one power supply for the load components is realized. When the station power is powered off, not only the continuous operation of the key load can be ensured, but also the power supply for the non-key load components can be realized at the necessary moment to adapt to the dynamic load demand.

[0051] S4, when a micro-grid subsystem a in a high-level power supply cluster has a power shortage, hydrogen in a low-level micro-grid subsystem is transported to the micro-grid subsystem a through a hydrogen pipeline, and the micro-grid subsystem a generates power through a hydrogen fuel cell to continuously supply power to the load components, wherein: the low-level micro-grid subsystem meets the following conditions: one, it belongs to the same energy supply network as the micro-grid subsystem a, and two, the corresponding load component is in a non-operating state;

[0052] The power shortage of the micro-grid subsystem a means that the electric energy in the energy storage module and the hydrogen in the hydrogen tank are both close to exhaustion, and at this time, the light is insufficient, so that the power of the entire micro-grid subsystem a is insufficient to continue to support the operation of the key load components. Therefore, in order to ensure the continuous operation of the key load, the hydrogen in the low-level micro-grid subsystem is transported to the micro-grid subsystem a (low level here refers to a level lower than that of the micro-grid subsystem a), so that the hydrogen fuel cell in the micro-grid subsystem a continues to work to generate electric energy, and the electric energy generated by the photovoltaic power generation unit, together, continuously provides sufficient power for the key load;

[0053] The reasons why the low-level micro-grid subsystem needs to meet the two conditions are as follows: for condition one, since the hydrogen pipeline is connected between the micro-grid subsystems of adjacent levels in the same energy supply network, the micro-grid subsystems in different energy supply networks cannot transport hydrogen; for condition two, since the low-level micro-grid subsystem corresponds to a non-key load component, under normal circumstances, the non-key load component is in a non-operating state when the station power is powered off, but there may be special cases where some non-key loads need to be started (as described in step S3). At this time, the corresponding low-level micro-grid subsystem needs to be powered, so if the corresponding load component is in an operating state, the low-level micro-grid subsystem needs to ensure that its power is sufficient, and it is not appropriate to transport hydrogen to the micro-grid subsystem a;

[0054] In addition, since there are multiple low-level micro-grid subsystems in the same hierarchical energy supply network, in step S4, hydrogen in only one low-level micro-grid subsystem is input into the micro-grid subsystem a at a time, and when the remaining hydrogen content in one low-level micro-grid subsystem is lower than the set value, hydrogen in another low-level micro-grid subsystem is transported, until the situation in step S5 occurs.

[0055] S5, when the remaining hydrogen content in the low-level micro-grid subsystem available for hydrogen transportation in the same hierarchical energy supply network is lower than the set value, the water electrolysis hydrogen production module in the low-level micro-grid subsystem is started, hydrogen is produced by consuming the electric energy in the energy storage module, and the hydrogen is continuously transported to the micro-grid subsystem a through the hydrogen transportation pipeline;

[0056] Similarly, only the water electrolysis hydrogen production module in one low-level micro-grid subsystem is started at a time, and when the electric energy is consumed to the set reserved value, the water electrolysis hydrogen production module in another low-level micro-grid subsystem is started. Although the operation process of step S5 causes certain energy loss, it effectively prolongs the operation time of the key load component, further reduces the economic loss caused by the paralysis of the key load component.

[0057] S6, when the electric quantity of the energy storage module is reduced to the set reserved value, the corresponding water electrolysis hydrogen production module is closed, and a certain amount of electric quantity is saved to cope with the sudden activation demand.

[0058] The second embodiment:

[0059] The difference between the present embodiment and the first embodiment is that the hydrogen transportation pipeline between adjacent level micro-grid subsystems is changed from one to two, and the transmission mode of hydrogen in the two hydrogen transportation pipelines is opposite, that is, one hydrogen transportation pipeline has the same use as in the first embodiment, so that the use method of the first embodiment can be normally implemented, and the other hydrogen transportation pipeline (hereinafter referred to as pipeline L) has the following functions.

[0060] As described in step S3, the low-priority load component (non-key load component) may also have an emergency activation situation, when it receives an activation demand, it is powered by the corresponding low-level power supply cluster, if its activation time is long, the electric energy and hydrogen of a micro-grid subsystem h are exhausted, and the electric energy and hydrogen of the lower-level micro-grid subsystem in the same hierarchical energy supply network are also used to the limit, in order to continue the operation of the non-key load component, one micro-grid subsystem with a higher level and closest to the non-key load component is selected, the hydrogen in the micro-grid subsystem is transported to the micro-grid subsystem h through the pipeline L, so that it continues to supply power to the non-key load component. The selected micro-grid subsystem needs to meet the following conditions: the corresponding load component is in a non-operating state (the reason is explained in the first embodiment).

[0061] Compared with the single hydrogen pipeline of the first embodiment, the embodiment sets two hydrogen pipelines for reverse transmission. Although the implementation cost is increased, the embodiment not only realizes the hydrogen supplement of the high-level micro-grid subsystem in the first embodiment, but also realizes the hydrogen supplement of the low-level micro-grid subsystem when necessary, thereby effectively prolonging the emergency activation duration of the non-critical load components, not easily interrupting the emergency response process of the non-critical load components, facilitating the operation of the power system, and effectively reducing the economic equipment loss.

[0062] The third embodiment:

[0063] The embodiment specifically sets the hydrogen pipeline in the first embodiment and makes it have the function of the two hydrogen pipelines in the second embodiment, that is, the reverse transmission of hydrogen can be realized, and the rest of the structure remains the same as that of the first embodiment. The structure of the hydrogen pipeline is specifically set as follows: please refer to Figure 4 to Figure 6 , which comprises an outer pipe 1 and a hollow semi-ring pipe 4 located inside the outer pipe 1. Both ends of the outer pipe 1 are fixedly connected with end columns 2. The outer end of the outer pipe 1 is paved with a sensing optical fiber 3, which is spirally wound on the outer end of the outer pipe 1.

[0064] As shown in Figure 8 and Figure 10 , the upper and lower inner walls of the outer pipe 1 are fixedly connected with baffles 5, and the hollow semi-ring pipe 4 is rotatably connected between a pair of baffles 5. The hollow semi-ring pipe 4 and the baffles 5 are in face contact and sealing state. The hollow semi-ring pipe 4 can divide the space inside the outer pipe 1 into two spaces that are not connected with each other.

[0065] Please refer to Figure 7 to Figure 9 , one end of the end column 2 close to the outer pipe 1 is provided with a first circular groove 201. The inner wall of the first circular groove 201 away from the outer pipe 1 is provided with a second circular groove 202. The inner wall of the second circular groove 202 away from the outer pipe 1 is provided with a third circular groove 203. The outer diameter of the hollow semi-ring pipe 4 is the same as the inner diameter of the first circular groove 201, and the end of the hollow semi-ring pipe 4 is rotatably connected to the inside of the first circular groove 201. Both ends of the hollow semi-ring pipe 4 are fixedly connected with large gears 10, which are located inside the second circular groove 202 and have a gap therebetween, so as not to easily affect the rotation of the large gears 10. The outer side of the end column 2 is provided with a rotating rod 8, the outer end of which is fixedly connected with a small gear 9. The small gear 9 is engagedly connected with the large gear 10. The end of the rotating rod 8 away from the small gear 9 is connected with the output end of the motor through a shaft coupling. The outer end of the end column 2 is provided with an open groove 204, which is communicated with the second circular groove 202. The rotating rod 8 and the small gear 9 are located inside the open groove 204, which does not easily hinder the rotation of the rotating rod 8 and the small gear 9.

[0066] Please refer to Figure 8 and Figure 9, the center of the end column 2 is fixedly connected with a first connecting pipe 6, one end of the first connecting pipe 6 is fixedly penetrated through the end column 2 and communicated with the inner side of the outer pipe 1, the outer pipe 1, the end column 2 and the hollow semi-ring pipe 4 are coaxially arranged, the inner diameter of the first connecting pipe 6 is smaller than the inner diameter of the hollow semi-ring pipe 4, the outer pipe 1 and the two first connecting pipes 6 form a communicated hydrogen flow channel which can be used for directional conveying of hydrogen, the end of the end column 2 away from the outer pipe 1 is fixedly connected with a second connecting pipe 7, one end of the second connecting pipe 7 extends to the inner side of the third circular groove 203 and is fixedly communicated with the hollow semi-ring pipe 4 through a hose 11, the hollow semi-ring pipe 4, the hose 11 and the second connecting pipe 7 form another communicated hydrogen flow channel which is also used for directional conveying of hydrogen, the conveying directions of hydrogen in the two hydrogen flow channels are opposite, the hose 11 is placed in a relaxed state in the inner side of the third circular groove 203, and the hose 11 can adapt to the 180° rotation process of the hollow semi-ring pipe 4.

[0067] The outer end of the hollow semi-ring pipe 4 is fixedly connected with a pair of sealing rings 401, and the pair of sealing rings 401 are tightly attached to the inner walls of the pair of first circular grooves 201 respectively, the sealing rings 401 can improve the sealing between the hollow semi-ring pipe 4 and the first circular grooves 201, so that the hollow semi-ring pipe 4 effectively divides the internal space of the outer pipe 1.

[0068] Please refer to Figure 10 When steps S4 and S5 are performed, hydrogen in the low-level micro-grid subsystem needs to be conveyed to the high-level micro-grid subsystem, at this time, the hydrogen flow channel formed by the hollow semi-ring pipe 4, the hose 11 and the second connecting pipe 7 is used, hydrogen in the low-level micro-grid subsystem is input into the second connecting pipe 7 through an electric conveying device (such as a conveying pump), then passes through the hose 11, the hollow semi-ring pipe 4, the other side of the hose 11 and the second connecting pipe 7, and finally enters the hydrogen tank of the high-level micro-grid subsystem;

[0069] In the above process, the outer pipe 1 has a non-contact wrapping effect on the hollow semi-ring pipe 4, when the hollow semi-ring pipe 4 leaks due to damage, the outer pipe 1 collects the leaked hydrogen, so that the leaked hydrogen is not easy to directly enter the external environment, effectively reducing the risk brought by hydrogen leakage.

[0070] Please refer to Figure 11 When the reverse conveying hydrogen process in the second embodiment needs to be performed, that is, hydrogen in the high-level micro-grid subsystem is conveyed to the low-level micro-grid subsystem (here, high-level and low-level are compared with each other, and there is a difference in level), the hydrogen flow channel formed by the outer pipe 1 and the first connecting pipe 6 is used for conveying, hydrogen in the high-level micro-grid subsystem is input into the first connecting pipe 6 through another electric conveying device (such as another conveying pump), then passes through the space on one side in the inner side of the outer pipe 1 (i.e. Figure 10G region) to the first connecting pipe 6 on the other side of the outer pipe 1, and then into the hydrogen tank of the low-grade micro-grid subsystem through the first connecting pipe 6;

[0071] In the above process, the leakage of the outer pipe 1 surface can be monitored by the sensing optical fiber 3, and the sensing optical fiber 3 is electrically connected with a distributed optical fiber acoustic wave monitoring system. When the hydrogen gas in the G region leaks through the leakage point on the surface of the outer pipe 1, the acoustic wave signal generated at the leakage point can be monitored by the sensing optical fiber 3, and the position of the leakage point can be calculated. At this time, on the one hand, the distributed optical fiber acoustic wave monitoring system can be used for leakage alarm, and on the other hand, in order to reduce the subsequent leakage of hydrogen gas, the hydrogen gas conveying process can be interrupted, and then the rotating rod 8 is started to drive the hollow half-ring pipe 4 to rotate 180° through the transmission of the pinion gear 9 and the gear wheel 10, as shown in Figure 12 and Figure 13 At this time, the hollow half-ring pipe 4 also divides the inner space of the outer pipe 1 into two unconnected spaces, and the G region space is occupied by the hollow half-ring pipe 4 and is no longer used for hydrogen transmission. The original position of the hollow half-ring pipe 4 is emptied, that is, the R region in Figure 13 The R region is in communication with the first connecting pipe 6, and when the hydrogen gas conveying continues, the hydrogen gas will flow along the R region, and the hydrogen gas will no longer flow through the leakage position, thereby effectively reducing the possibility of continuous hydrogen leakage. Before the on-site maintenance of personnel, the reverse conveying of hydrogen gas can still be carried out.

[0072] Supplementary note: When the hydrogen gas is conveyed through the R region, the sensing optical fiber 3 again monitors the acoustic wave signal of the leakage, indicating that there is a leakage point in the region of the outer pipe 1 corresponding to the R region. At this time, the reverse conveying process of the hydrogen gas by the outer pipe 1 should be stopped.

[0073] In combination with the current actual demand, the above-mentioned embodiments adopted by the present application are not limited to this, and various changes made within the knowledge range of those skilled in the art without departing from the concept of the present application still fall within the protection scope of the present application.

Claims

1. A substation intelligent microgrid control system, characterized in that: The application relates to a substation intelligent micro-grid control system, which comprises a plurality of power supply clusters, the power supply clusters comprise a plurality of micro-grid subsystems, the plurality of power supply clusters supply power to different load components respectively, the plurality of power supply clusters are divided in order from high to low in grade, the higher the grade of the power supply cluster is, the higher the priority of the corresponding load component is, and the grade of the micro-grid subsystem is the same as the grade of the power supply cluster to which the micro-grid subsystem belongs. One micro-grid subsystem is selected from each power supply cluster, the plurality of micro-grid subsystems of different grades jointly form a cascade energy supply network, and a hydrogen conveying pipeline is arranged between the micro-grid subsystems of adjacent grades in the cascade energy supply network. The micro-grid subsystem comprises a power generation module, an energy storage module, a power supply module and a water electrolysis hydrogen production module, the power supply module supplies power to the corresponding load component, the power generation module comprises a photovoltaic power generation unit and a hydrogen fuel cell, the hydrogen fuel cell comprises a hydrogen tank for storing hydrogen, the hydrogen produced by the water electrolysis hydrogen production module is stored in the hydrogen tank, and the hydrogen conveying pipeline is used for connecting the hydrogen tanks of different micro-grid subsystems. The use method of the substation intelligent micro-grid control system comprises the following steps: S1. Under normal circumstances, all load components in the substation are supplied with power by a station power supply, the photovoltaic power generation unit converts light energy into electric energy and stores the electric energy in an energy storage module, and the water electrolysis hydrogen production module is not started under the condition that the energy storage module is not full of electricity; S2. When the energy storage module is full of electricity and the external light energy is sufficient, the water electrolysis hydrogen production module is started, surplus electric energy generated by the photovoltaic power generation module is used to perform water electrolysis hydrogen production operation, and the generated hydrogen is stored in the hydrogen tank; S3. When the station power supply is powered off, the load components with high priority are automatically supplied with power by the corresponding high-grade power supply cluster, and the load components with low priority are supplied with power by the corresponding low-grade power supply cluster when the load components with low priority receive an enabling demand; S4. When a micro-grid subsystem a in the high-grade power supply cluster has a power shortage, hydrogen in a low-grade micro-grid subsystem is conveyed to the micro-grid subsystem a through the hydrogen conveying pipeline, the micro-grid subsystem a generates power through the hydrogen fuel cell and continuously supplies power to the load components, and the low-grade micro-grid subsystem meets the following conditions: one, the low-grade micro-grid subsystem belongs to the same cascade energy supply network as the micro-grid subsystem a, and two, the corresponding load component is in a non-running state; S5. When the remaining hydrogen content of the low-grade micro-grid subsystem available for hydrogen conveying in the same cascade energy supply network is lower than a set value, the water electrolysis hydrogen production module in the low-grade micro-grid subsystem is started, hydrogen is produced by consuming electric energy in the energy storage module, and the hydrogen is continuously conveyed to the micro-grid subsystem a through the hydrogen conveying pipeline; S6. When the electric quantity of the energy storage module is reduced to a set reserved value, the corresponding water electrolysis hydrogen production module is closed, and a certain amount of electric quantity is reserved to cope with an unexpected enabling demand.

2. The substation intelligent microgrid control system of claim 1, wherein: The hydrogen conveying pipeline comprises an outer pipe (1) and a hollow half-ring pipe (4) arranged inside the outer pipe (1), both ends of the outer pipe (1) are fixedly connected with end columns (2), and a sensing optical fiber (3) is laid on the outer end of the outer pipe (1).

3. The substation intelligent microgrid control system of claim 2, wherein: The upper and lower inner walls of the outer pipe (1) are fixedly connected with the partition plates (5), the hollow semi-ring pipe (4) is rotationally connected between the pair of partition plates (5), the end column (2) is provided with the first circular groove (201) at one end close to the outer pipe (1), the first circular groove (201) is provided with the second circular groove (202) away from the inner wall of the outer pipe (1), the second circular groove (202) is provided with the third circular groove (203) away from the inner wall of the outer pipe (1), the outer diameter of the hollow semi-ring pipe (4) is same with the inner diameter of the first circular groove (201), and the end of the hollow semi-ring pipe (4) is rotationally connected in the first circular groove (201).

4. The substation intelligent microgrid control system of claim 3, wherein: The both ends of the hollow semi-ring pipe (4) are fixedly connected with the gear wheels (10), the gear wheels (10) are located in the inner side of the second circular groove (202), the outer side of the end column (2) is provided with the rotating rod (8), the outer end of the rotating rod (8) is fixedly connected with the pinion (9), the pinion (9) is meshingly connected with the gear wheel (10), one end of the rotating rod (8) away from the pinion (9) is connected with the output end of the motor through the shaft coupling.

5. The substation intelligent microgrid control system of claim 4, wherein: The outer end of the end column (2) is provided with the open groove (204), and the open groove (204) is communicated with the second circular groove (202), the rotating rod (8) and the pinion (9) are located in the inner side of the open groove (204).

6. The substation intelligent microgrid control system of claim 2, wherein: The central position of the end column (2) is fixedly connected with the first connecting pipe (6), one end of the first connecting pipe (6) is fixedly penetrated through the end column (2) and communicated with the inner side of the outer pipe (1), the outer pipe (1), the end column (2) and the hollow semi-ring pipe (4) are coaxially arranged, the inner diameter of the first connecting pipe (6) is smaller than the inner diameter of the hollow semi-ring pipe (4).

7. The substation intelligent microgrid control system of claim 3, wherein: One end of the end column (2) away from the outer pipe (1) is fixedly connected with the second connecting pipe (7), one end of the second connecting pipe (7) extends to the inner side of the third circular groove (203) and is fixedly communicated with the hollow semi-ring pipe (4) through the hose (11), the hose (11) is placed in the inner side of the third circular groove (203) in a relaxed state.

8. The substation intelligent microgrid control system of claim 3, wherein: The outer end of the hollow semi-ring pipe (4) is fixedly connected with the pair of sealing rings (401), and the pair of sealing rings (401) are tightly attached to the inner walls of the pair of first circular grooves (201) respectively.

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