Gas storage pressure energy power generation system

Abstract

The utility model relates to the field of new energy power generation, in particular to a gas storage pressure energy power generation system. According to the technical scheme, the system comprises a plurality of energy conversion units, a distributed electric energy grid-connected control unit and an electric energy quality management platform; the distributed electric energy grid-connected control unit is connected with each energy conversion unit, and the electric energy quality management platform is connected with each energy conversion unit; the gas production ends of one or more gas storage injection and production wells with close geographic positions are connected to the public gas production end of the gas storage injection and production station in parallel, and the output ends of one or more gas storage injection and production stations are connected to the energy conversion unit in parallel. The system has the advantages that waste energy is efficiently utilized, the stability and controllability of the system are improved, intelligent and automatic management and modular and extensible design are achieved, remarkable economic benefits and environmental friendliness are brought, and an effective technical approach is provided for solving the problem of high carbon emission caused by thermal power generation.

Description

Technical Field

[0001] The utility model belongs to the field of new energy power generation, and particularly relates to a pressure energy power generation system for a gas storage reservoir. Background Art

[0002] In the urgent need to address global climate change and reduce greenhouse gas emissions, thermal power generation is gradually being restricted and replaced due to its high carbon emissions. In order to seek more environmentally friendly and sustainable energy solutions, China is vigorously promoting the development of new energy power generation technologies such as wind energy, solar energy, and tidal energy. These new energies, with their clean and renewable characteristics, are regarded as important ways to replace traditional fossil fuels and reduce the environmental burden.

[0003] As the proportion of new energy in the power supply system continues to rise, its inherent volatility poses new challenges to the safe and stable operation of the power grid. Take solar power generation as an example. Its power generation efficiency is significantly affected by natural conditions such as sunlight intensity, cloud cover, and seasonal changes, resulting in large uncertainties in power output. Similarly, tidal energy power generation is also limited by the periodic changes of ocean tides and has the problem of seasonal fluctuations. Therefore, while improving the energy conversion efficiency of new energy power generation, how to ensure the stability and controllability of the output power has become a key technical problem亟待解决 in the current new energy field.

[0004] During the injection and production process of the gas storage reservoir, when the high-pressure natural gas in the wellbore is depressurized and transported to the natural gas transmission pipeline, a large amount of pressure energy is released. This part of the energy is often ignored or wasted and not effectively utilized. However, with the continuous improvement of the requirements for resource recycling and energy conservation and emission reduction, converting this part of the pressure energy into electric energy not only helps to improve energy utilization efficiency but also further reduces carbon emissions, achieving a win-win situation for environmental protection and economic benefits. [[ID=1,5]]

[0005] However, the pressure energy power generation technology also faces challenges similar to other new energy power generation forms. Although there are examples of applying the pressure energy power generation system to the operation of gas storage reservoirs, as shown in the Chinese patent application with the publication number 202310763818.8, the current technical means are still unable to calculate the energy conversion efficiency during the power generation process in real time, nor can they conduct online evaluation and optimization of power quality. Therefore, there are still certain challenges in ensuring that the electric energy output by the pressure energy power generation system is safely and effectively incorporated into the power grid. Due to the randomness and instability of pressure energy release, the electric energy output during the power generation process also has fluctuations and uncontrollable power quality problems. This not only affects the stable operation of the power system but may also damage power grid equipment, increasing the operation and maintenance costs and risks. Therefore, how to effectively solve the problems of power stability and controllability in pressure energy power generation has become the key to promoting the commercial application and large-scale promotion of this technology.

[0006] In summary, existing technologies face challenges in stability and controllability, as well as underutilization of resources, in both new energy power generation and gas storage pressure energy generation. Utility Model Content

[0007] To address the aforementioned technical problems in existing technologies, this invention provides a gas storage pressure energy power generation system that can monitor electrical parameters in real time during the conversion of pressure energy into electrical energy, thereby improving the stability of the output power. Furthermore, the system is equipped with a grid-connected control interface, enabling it to supply power to loads of various voltage levels.

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] A gas storage pressure energy power generation system includes: several energy conversion units, a distributed power grid connection control unit, and a power quality management platform; the distributed power grid connection control unit is connected to each of the energy conversion units, and the power quality management platform is connected to each of the energy conversion units; the gas production ends of one or more geographically proximate gas storage injection and production wells are connected in parallel to the common gas production end of the gas storage injection and production station, and the output ends of one or more gas storage injection and production stations are connected in parallel to the energy conversion units.

[0010] Furthermore, the energy conversion unit includes a gas purification device, an inlet pressure gauge, an inlet pressure regulating valve, an inlet thermometer, a gas flow meter, an expander, a speed governor, a generator, a current transformer, and an electricity meter, connected in sequence.

[0011] Furthermore, the energy conversion unit also includes an outlet pressure regulating valve, an outlet thermometer, an outlet pressure gauge, and a gas valve connected in sequence to the expander; and a parameter measuring instrument is connected in parallel with the current transformer.

[0012] Furthermore, the energy conversion unit is located within the gas storage and injection station. The output terminal of the energy meter in the energy conversion unit is connected to the input terminal of the distributed power grid-connected control unit. The output terminal of the gas valve in the energy conversion unit is connected to the input terminal of the gas transmission pipeline. The signal terminal of the parameter measuring instrument in the energy conversion unit is connected to the input terminal of the power quality management platform. The signal terminal of the energy meter in the energy conversion unit is also connected to the input terminal of the power quality management platform.

[0013] Furthermore, the gas purification device includes a pre-separator, a pre-cooler, a production separator, a heat exchanger, a wet gas digital temperature gauge, and a low-temperature separator connected in sequence; the heat exchanger is also connected to a dry gas digital temperature gauge.

[0014] Furthermore, in the gas purification device, the dry gas output end of the heat exchanger is connected to the pressurization system interface via an inlet pressure gauge. The dry gas output end of the heat exchanger in the gas purification device is also connected to the input end of the inlet pressure regulating valve via an inlet pressure gauge. The output end of the inlet pressure regulating valve is connected to one end of a gas flow meter via an inlet thermometer. The other end of the gas flow meter is connected to the input end of the expander. The inlet pressure gauge is wirelessly connected to the computer of the distributed power control system. The signal end of the inlet thermometer is connected to the hub of the distributed power control system. The signal end of the gas flow meter is also connected to the hub of the distributed power control system. The screw of the expander is connected to the input end of the speed regulator. The output end of the speed regulator is connected to the screw of the generator. The output end of the generator is connected to the input end of the power meter via the primary side of a current transformer. The output of the energy meter is connected to the input of the filter in the distributed energy grid-connected control system. The secondary side of the current transformer is connected to the input of the parameter measuring instrument. The signal end of the parameter measuring instrument is connected to the data acquisition card of the power quality management platform. The signal end of the energy meter is connected to the RS485 communication bus of the power quality management platform. The output of the expander is connected to the input of the outlet pressure regulating valve. The output of the outlet pressure regulating valve is connected to one end of the outlet pressure gauge via an outlet thermometer. The other end of the outlet pressure gauge is connected to one end of a gas valve. The other end of the gas valve is connected to the input of the gas pipeline. One end of the outlet pressure gauge is connected to the pressurization system interface. The other end of the outlet pressure gauge is connected to the depressurization system interface. The outlet pressure gauge is connected to the computer of the distributed energy control system via a wireless signal.

[0015] Furthermore, the input end of the pre-separator is connected to the gas sampling interface, the output end of the pre-separator is connected to the input end of the production separator via a precooler, the output end of the production separator is connected to the moisture input end of the heat exchanger, the moisture output end of the heat exchanger is connected to the input end of the low-temperature separator, and the moisture output end of the heat exchanger is connected to the input end of the moisture digital thermometer; the output end of the low-temperature separator is connected to the dry gas input end of the heat exchanger, and the dry gas output end of the heat exchanger is connected to the input end of the dry gas digital thermometer.

[0016] Furthermore, the power quality management platform includes: a computer, a CAN adapter card, a CAN bus, a data acquisition card, a reactive power compensation controller, a reactive power compensation device, and an RS485 communication bus; the computer is connected to the RS485 communication bus, the CAN adapter card, and the reactive power compensation controller respectively; the CAN adapter card is connected to several CAN buses, and the CAN buses are connected to several data acquisition cards respectively; the reactive power compensation controller is connected to the reactive power compensation device.

[0017] Furthermore, one end of the computer is connected to one end of the CAN bus via a CAN adapter card, and the other end of the CAN bus is connected to one end of a data acquisition card. The other end of the data acquisition card is connected to the signal terminal of the parameter measuring instrument in the energy conversion unit. One end of the computer is connected to one end of the reactive power compensation controller, and the computer transmits data with the computer of the distributed power control system via wireless communication. The other end of the reactive power compensation controller is connected to the control terminal of the reactive power compensation device, and the output terminal of the reactive power compensation device is connected to the reactive power compensation interface of the distributed power grid-connected control system.

[0018] Furthermore, the distributed power grid-connected control unit includes: a computer, a hub, a box-type transformer, a collector bus, a filter, a 35kV bus, a main circuit breaker, a grid-side disconnect switch, a line-side disconnect switch, a load-side disconnect switch, a bus-side disconnect switch, a protection disconnect switch, a circuit breaker, a fuse, a voltage transformer, a total power meter, and a step-up transformer; the output terminal of the filter is connected to a reactive power compensation interface, the output terminal of the filter is connected to a low-voltage load interface, the output terminal of the filter is connected to the input terminal of the box-type transformer, the output terminal of the box-type transformer is connected to one end of the circuit breaker via a load-side disconnect switch, and the other end of the circuit breaker is connected to one end of the collector bus via a bus-side disconnect switch; the other end of the collector bus is connected to one end of the 35kV bus via a step-up transformer, the other end of the 35kV bus is connected to a 35kV load interface, and the other end of the 35kV bus is connected to a line-side disconnect switch. The circuit breaker is connected to one end of the main circuit breaker; the other end of the main circuit breaker is connected to one end of the grid-side disconnect switch, the other end of the grid-side disconnect switch is connected to one end of the main power meter, the other end of the main power meter is connected to the battery interface via the grid connection point reactive power compensation interface, and the other end of the main power meter is connected to the grid via the grid connection point reactive power compensation interface; the control terminal of the line-side disconnect switch is connected to the computer via a hub, the control terminal of the grid-side disconnect switch is connected to the computer via a hub, and the computer transmits data to the power quality management platform computer via wireless communication; the control terminal of the main circuit breaker is connected to the computer via a hub, and the signal terminal of the main power meter is connected to the computer via a hub; one end of the 35kV busbar is connected to one end of a fuse via a protection disconnect switch, the other end of the fuse is connected to a voltage transformer, and the control terminal of the protection disconnect switch is connected to the computer via a hub.

[0019] The beneficial effects of this utility model are:

[0020] Compared with the prior art, the gas storage pressure energy power generation system of this utility model has the following technical features and beneficial effects:

[0021] Efficient resource utilization and energy conservation and emission reduction:

[0022] This invention utilizes the pressure energy released during the gas extraction process of gas storage injection and production wells to generate electricity, thereby achieving effective recovery and utilization of waste energy generated during natural gas extraction and significantly improving energy utilization efficiency.

[0023] No additional carbon emissions are generated during the power generation process, which helps to reduce overall carbon emissions.

[0024] System stability and controllability:

[0025] The energy conversion unit is equipped with regulating devices such as inlet pressure regulating valve and outlet pressure regulating valve, as well as a speed governor to regulate the speed of the expander, to ensure the stability of gas pressure and flow during power generation, thereby ensuring the stability and controllability of the output power.

[0026] The introduction of distributed power grid-connected control units and power quality management platforms further enhances the system's regulation and control capabilities and its ability to manage power quality, enabling the system to better adapt to grid demands and ensure the safe and stable operation of the grid.

[0027] Intelligentization and Automation:

[0028] Multiple sensors (such as inlet pressure gauges, inlet thermometers, gas flow meters, etc.) and controllers (such as speed controllers, reactive power compensation controllers, etc.) in the system are connected to the computer via wired or wireless means, enabling real-time data monitoring and remote control.

[0029] The power quality management platform and distributed power grid-connected control unit adopt advanced computer and communication technologies to realize intelligent management and automated control of system operation, reduce operation and maintenance costs, and improve the reliability and efficiency of system operation.

[0030] Modularity and scalability:

[0031] The energy conversion unit adopts a modular design, which can be flexibly configured according to the size of the gas storage facility and the pressure energy, thus improving the system's flexibility and scalability.

[0032] The distributed power grid-connected control unit and power quality management platform also support modular expansion, and can be upgraded and expanded accordingly as the system scale increases.

[0033] Significant economic benefits:

[0034] By recovering and utilizing the pressure energy of gas storage facilities for power generation, not only can clean and stable electricity be provided to the power grid, but additional economic benefits can also be brought to gas storage facility operators.

[0035] The intelligent and automated management of the system reduces operation and maintenance costs and improves overall economic efficiency.

[0036] Environmentally friendly:

[0037] The entire power generation process does not produce wastewater, exhaust gas, or other pollutants, making it environmentally friendly and in line with the concept of sustainable development.

[0038] In summary, the gas storage pressure energy power generation system of this utility model provides an effective technical approach to solving the problem of high carbon emissions caused by thermal power generation by efficiently utilizing waste energy, improving system stability and controllability, realizing intelligent and automated management, modular and scalable design, and bringing significant economic benefits and environmental friendliness. Attached Figure Description

[0039] To more clearly illustrate the technical solutions of the embodiments of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0040] Figure 1 This is a framework diagram of the gas storage pressure energy power generation system of this utility model;

[0041] Figure 2 This is a schematic diagram of the connection of the energy conversion unit of this utility model;

[0042] Figure 3 This is a connection diagram of the gas purification device of this utility model;

[0043] Figure 4 This is a connection diagram of the distributed power control system of this utility model;

[0044] Figure 5 This is a connection diagram of the power quality management platform of this utility model;

[0045] The attached diagram is labeled as follows: 1-Energy conversion unit, 2-Distributed power grid connection control unit, 3-Power quality management platform;

[0046] 11-Gas purification device; 12-Inlet pressure gauge; 13-Inlet pressure regulating valve; 14-Inlet thermometer; 15-Gas flow meter; 16-Expander; 17-Speed ​​controller; 18-Generator; 19-Current transformer; 110-Electricity meter; 111-Parameter measuring instrument; 112-Outlet pressure regulating valve; 113-Outlet thermometer; 114-Outlet pressure gauge; 115-Gas valve;

[0047] a1-Pre-separator, a2-Pre-cooler, a3-Production separator, a4-Heat exchanger, a5-Wet gas digital thermometer, a6-Low temperature separator, a7-Dry gas digital thermometer, a41-Wet gas input terminal, a42-Dry gas input terminal, a43-Wet gas output terminal, a44-Dry gas output terminal;

[0048] 21-Computer A, 22-Hub, 23-Box-type transformer, 24-Collector busbar, 25-Filter, 26-35kV busbar, 27-Main circuit breaker, 28-Grid-side disconnecting switch, 29-Line-side disconnecting switch, 210-Load-side disconnecting switch, 211-Bus-side disconnecting switch, 212-Protection disconnecting switch, 213-Circuit breaker, 214-Fuse, 215-Voltage transformer, 216-Total energy meter, 217-Step-up transformer;

[0049] 31-Computer B, 32-CAN adapter card, 33-CAN bus, 34-Data acquisition card, 35-Reactive power compensation controller, 36-Reactive power compensation device, 37-RS485 communication bus. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model. The following description, in conjunction with the accompanying drawings... Figure 1-5 The gas storage pressure energy power generation system will be further described, and the technical solutions in the embodiments of this application will be clearly and completely described. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0051] Example 1

[0052] The purpose of this invention is to provide a pressure energy power generation system for gas storage facilities.

[0053] The technical solution of this utility model is:

[0054] A pressure energy power generation system for a gas storage facility, comprising:

[0055] m energy conversion units 1, distributed power grid connection control unit 2, power quality management platform 3;

[0056] One or more geographically proximate gas storage injection and production wells have their production ends connected in parallel to the common production end of the gas storage injection and production station. The output ends of one or more gas storage injection and production stations are connected in parallel to the energy conversion unit 1 of the gas storage pressure energy power generation system. The energy conversion unit 1 is located within the gas storage injection and production station. The output end of the power meter 110 in the energy conversion unit 1 is connected to the input end of the distributed power grid-connected control unit 2. The output end of the gas valve 115 in the energy conversion unit 1 is connected to the input end of the gas transmission pipeline. The signal end of the parameter measuring instrument 111 in the energy conversion unit 1 is connected to the input end of the power quality management platform 3. The signal end of the power meter 110 in the energy conversion unit 1 is connected to the input end of the power quality management platform 3.

[0057] The energy conversion unit 1 includes a gas purification device 11, an inlet pressure gauge 12, an outlet pressure gauge 114, an inlet pressure regulating valve 13, an outlet pressure regulating valve 112, a gas valve 115, a gas flow meter 15, an inlet thermometer 14, an outlet thermometer 113, an expander 16, a speed regulator 17, a generator 18, a current transformer 19, a parameter measuring instrument 111, and an electricity meter 110.

[0058] In the gas purification device 11, the dry gas output terminal a44 of heat exchanger a4 is connected to the pressurization system interface via inlet pressure gauge 12. The dry gas output terminal a44 of heat exchanger a4 is connected to the input terminal of inlet pressure regulating valve 13 via inlet pressure gauge 12. The output terminal of inlet pressure regulating valve 13 is connected to one end of gas flow meter 15 via inlet thermometer 14. The other end of gas flow meter 15 is connected to the input terminal of expander 16. Inlet pressure gauge 12 is wirelessly connected to computer A21 of distributed power control system. The signal terminal of inlet thermometer 14 is connected to hub 22 of distributed power control system. The signal terminal of gas flow meter 15 is also connected to hub 22 of distributed power control system. The screw of expander 16 is connected to the input terminal of speed regulator 17. The output terminal of speed regulator 17 is connected to the screw of generator 18. The output terminal of generator 18 is connected to the input terminal of power meter 110 via the primary side of current transformer 19. The output of the power meter 110 is connected to the input of the filter 25 in the distributed power grid control system. The secondary side of the current transformer 19 is connected to the input of the parameter measuring instrument 111. The signal end of the parameter measuring instrument 111 is connected to the data acquisition card 34 of the power quality management platform 3. The signal end of the power meter 110 is connected to the RS485 communication bus 37 of the power quality management platform 3. The output of the expander 16 is connected to the input of the outlet pressure regulating valve 112. The output of the outlet pressure regulating valve 112 is connected to one end of the outlet pressure gauge 114 via the outlet thermometer 113. The other end of the outlet pressure gauge 114 is connected to one end of the gas valve 115. The other end of the gas valve 115 is connected to the input of the gas pipeline. The other end of the outlet pressure gauge 114 is connected to the pressurization system interface. The other end of the outlet pressure gauge 114 is connected to the depressurization system interface. The outlet pressure gauge 114 is connected to the computer A21 of the distributed power control system via a wireless signal.

[0059] The gas purification device 11 includes a pre-separator a1, a pre-cooler a2, a production separator a3, a heat exchanger a4, a wet gas digital thermometer a5, and a dry gas digital thermometer a7.

[0060] The input end of the pre-separator a1 is connected to the gas sampling interface. The output end of the pre-separator a1 is connected to the input end of the production separator a3 via the precooler a2. The output end of the production separator a3 is connected to the humid gas input end a41 of the heat exchanger a4. The humid gas output end a43 of the heat exchanger a4 is connected to the input end of the low-temperature separator a6. The humid gas output end a43 of the heat exchanger a4 is connected to the input end of the humid gas digital thermometer a5. The output end of the humid gas digital thermometer a5 displays the temperature of the humid gas. The output end of the low-temperature separator a6 is connected to the dry gas input end a42 of the heat exchanger a4. The dry gas output end a44 of the heat exchanger a4 is connected to the input end of the dry gas digital thermometer a7. The output end of the dry gas digital thermometer a7 displays the temperature of the dry gas.

[0061] The power quality management platform 3 includes a computer B31, a CAN adapter card 32, a CAN bus 33, a data acquisition card 34, a reactive power compensation controller 35, a reactive power compensation device 36, and an RS485 communication bus 37.

[0062] One end of computer B31 is connected to one end of CAN bus 33 via CAN adapter card 32. The other end of CAN bus 33 is connected to one end of data acquisition card 34. The other end of data acquisition card 34 is connected to the signal terminal of parameter measuring instrument 111 in energy conversion unit 1. One end of computer B31 is connected to one end of reactive power compensation controller 35. Computer B31 transmits data with computer B31 of distributed power control system via wireless communication. The other end of reactive power compensation controller 35 is connected to the control terminal of reactive power compensation device 36. The output terminal of reactive power compensation device 36 is connected to the reactive power compensation interface of distributed power grid-connected control system.

[0063] The distributed power grid-connected control unit 2 includes a computer A21, a hub 22, a box-type transformer 23, a collector bus 24, a filter 25, a 35kV bus 26, a main circuit breaker 27, a grid-side disconnect switch 28, a line-side disconnect switch 29, a load-side disconnect switch 210, a bus-side disconnect switch 211, a protection disconnect switch 212, a circuit breaker 213, a fuse 214, a voltage transformer 215, a total power meter 216, and a step-up transformer 217.

[0064] The output of filter 25 is connected to a reactive power compensation interface, a low-voltage load interface, and an input of box-type transformer 23. The output of box-type transformer 23 is connected to one end of circuit breaker 213 via load-side disconnect switch 210. The other end of circuit breaker 213 is connected to one end of collector bus 24 via bus-side disconnect switch 211. The other end of collector bus 24 is connected to one end of 35kV bus 26 via step-up transformer 217. The other end of 35kV bus 26 is connected to a 35kV load interface. The other end of 35kV bus 26 is connected to one end of main circuit breaker 27 via line-side disconnect switch 29. The other end of main circuit breaker 27 is connected to one end of grid-side disconnect switch 28. The other end of grid-side disconnect switch 28 is connected to one end of total energy meter 216. The other end of 6 is connected to the battery interface via the reactive power compensation interface at the grid connection point, and the other end of the total power meter 216 is connected to the power grid via the reactive power compensation interface at the grid connection point; the control end of the line-side disconnect switch 29 is connected to computer A21 via hub 22, and the control end of the grid-side disconnect switch 28 is connected to computer A21 via hub 22. Computer A21 transmits data with computer B31 of the power quality management platform 3 via wireless communication; the control end of the main circuit breaker 27 is connected to computer A21 via hub 22, and the signal end of the total power meter 216 is connected to computer A21 via hub 22; one end of the 35kV bus 26 is connected to one end of fuse 214 via protection disconnect switch 212, and the other end of fuse 214 is connected to voltage transformer 215. The control end of protection disconnect switch 212 is connected to computer A21 via hub 22.

[0065] Work process description:

[0066] 1. Gas purification and pressure energy conversion stage (energy conversion unit 1):

[0067] a. Gas purification:

[0068] Natural gas is extracted from the production end of the gas storage injection-production well and enters the gas purification unit 11 of energy conversion unit 1 through the parallel-connected gas storage injection-production station. The natural gas first enters the pre-separator a1 for preliminary separation, then passes through the pre-cooler a2 for cooling, and then enters the production separator a3 for further separation. The separated wet gas enters the heat exchanger a4 for heat exchange with dry gas, and then enters the cryogenic separator a6 for final separation. The dry gas output from the cryogenic separator a6 re-enters the heat exchanger a4 for heating, and the temperature is monitored by the dry gas digital temperature gauge a7, ultimately yielding purified dry gas.

[0069] b. Pressure energy conversion:

[0070] The purified dry gas has its pressure monitored by inlet pressure gauge 12 and regulated to a stable pressure by inlet pressure regulating valve 13. The stabilized dry gas has its temperature monitored by inlet thermometer 14 and then flows through gas flow meter 15 to measure its flow rate. The dry gas, after flow measurement, enters expander 16, which is driven by the pressure energy of the dry gas and its speed is adjusted by speed controller 17. The generator 18 driven by expander 16 generates electrical energy, which is measured by current transformer 19 and then input into electricity meter 110 for metering.

[0071] 2. Electricity metering and grid connection control stage (distributed electricity grid connection control unit 2):

[0072] a. Electricity metering:

[0073] The metering data from the electricity meter 110 is transmitted to the computer A21 of the distributed power grid control unit 2 via wired or wireless means.

[0074] b. Grid connection control:

[0075] Computer A21, based on received power metering data and grid demand, controls switching equipment such as line-side disconnect switch 29, grid-side disconnect switch 28, and main circuit breaker 27 via hub 22 to achieve grid-connected power control. Filter 25 is used to filter out harmonics in the power supply, ensuring the quality of grid-connected power. Box-type transformer 23 converts the power supply to an appropriate voltage level, and then transmits the power to 35kV bus 26 via collector bus 24, step-up transformer 217, and other equipment, before distributing it to loads of different voltage levels.

[0076] 3. Power Quality Management and Reactive Power Compensation Phase (Power Quality Management Platform 3):

[0077] a. Power quality management:

[0078] The parameter measuring instrument 111 monitors electrical parameters (such as voltage, current, power factor, etc.) in real time and transmits the data to the computer B31 of the power quality management platform 3 via the data acquisition card 34. Based on the monitoring data, the computer B31 manages and optimizes power quality through devices such as the CAN bus 33 and CAN adapter card 32.

[0079] b. Reactive power compensation:

[0080] Based on the power quality monitoring results, computer B31 controls reactive power compensation device 36 through reactive power compensation controller 35 to perform reactive power compensation, so as to improve the power factor of the power grid and reduce power loss.

[0081] This invention constructs a gas storage pressure energy power generation system comprising an energy conversion unit 1, a distributed power grid-connected control unit 2, and a power quality management platform 3. This system not only monitors power parameters in real time and ensures power quality, but also supplies power to loads at multiple voltage levels through grid-connected control.

[0082] Example 2

[0083] This embodiment is either a new embodiment or a supplement to Embodiment 1.

[0084] like Figure 1 As shown, the gas storage pressure energy power generation system includes m energy conversion units 1, a distributed power grid connection control unit 2, and a power quality management platform 3.

[0085] like Figure 2 As shown, the energy conversion unit 1 includes a gas purification device 11, an inlet pressure gauge 12, an outlet pressure gauge 114, an inlet pressure regulating valve 13, an outlet pressure regulating valve 112, a gas valve 115, a gas flow meter 15, an inlet thermometer 14, an outlet thermometer 113, an expander 16, a speed regulator 17, a generator 18, a current transformer 19, a parameter measuring instrument 111, and an electricity meter 110.

[0086] The inlet pressure gauge 12 measures the pressure of the outflowing gas purification device 11 and transmits it wirelessly to the computer A21 of the distributed power control system. Simultaneously, it determines the relationship between this pressure and the inlet pressure of the expander 16. If the pressure is less than the minimum inlet pressure required by the expander 16, the gas needs to be pressurized through a pressurization system. If the pressure is greater than or equal to the minimum inlet pressure required by the expander 16, the gas is delivered to the expander 16 via the inlet pressure regulating valve 13. The outlet pressure gauge 114 measures the pressure of the outflowing outlet pressure regulating valve 112 and transmits it wirelessly to the computer A21 of the distributed power control system. The computer A21 of the distributed power control system simultaneously determines the relationship between the pressure and the input pressure of the gas pipeline. If the pressure is less than the minimum input pressure of the gas pipeline, the gas needs to be pressurized by the pressurization system before being output to the gas pipeline. If the pressure is greater than the maximum input pressure of the gas pipeline, the gas needs to be depressurized by the depressurization system before being output to the gas pipeline. In this embodiment, the inlet pressure gauge 12 and the outlet pressure gauge 114 are both MD-S270 with a range of 0 to 100 MPa, and the inlet pressure regulating valve 13 and the outlet pressure regulating valve 112 are both ZZYP-16C.

[0087] The inlet thermometer 14 is used to measure the temperature of the gas flowing into the expander 16 and transmits the data to the computer A21 of the distributed power control system via RS485 data communication; the outlet thermometer 113 is used to measure the temperature of the gas flowing out of the outlet pressure regulating valve 112 and transmits the data to the computer A21 of the distributed power control system via RS485 data communication; the gas flow meter 15 is used to measure the gas flow rate flowing into the expander 16 and transmits the data to the computer A21 of the distributed power control system via RS485 data communication; the power meter 110 is used to measure the power output of the generator 18, and the gas valve 115 is used to control the gas flow rate flowing into the gas pipeline; in this embodiment, the inlet thermometer 14 and the outlet thermometer 113 are both model JK-FB001WS, the power meter 110 is model DTSD341, and the gas flow meter is model LWQ-DN100.

[0088] The expander 16 is a screw expander 16, used to convert pressure energy into mechanical energy on the screw. The speed regulator 17 is used to adjust the speed of the screw of the expander 16. The generator 18 is a permanent magnet synchronous generator 18, outputting 0.4kV AC power. The current transformer 19 is used to reduce the output current of the generator 18 to a small current within the measurement range of the parameter measuring instrument 111 according to the transformation ratio. In addition, the current transformer 19 can also protect the parameter measuring instrument 111. The parameter measuring instrument 111 is used to measure the voltage, current, power factor and three-phase voltage imbalance of the generator 18 output, and transmits the parameters to the power quality management platform 3 through the signal terminal. In this embodiment, the current transformer 19 is model LMZJ1, and the parameter measuring instrument 111 is model YP9830.

[0089] like Figure 3 As shown, the gas purification device 11 includes a pre-separator a1, a pre-cooler a2, a production separator a3, a heat exchanger a4, a wet gas digital thermometer a5, and a dry gas digital thermometer a7.

[0090] The pre-separator a1 is used to complete the three-phase separation and metering of oil, gas and water; the precooler a2 is used to cool natural gas to a specified temperature, which is 25°C in this embodiment; the production separator a3 is used to complete the two-phase separation of gas and liquid; the heat exchanger a4 is used to cool the humid gas and heat the dry gas and condensate; the humid gas digital thermometer a5 and the dry gas digital thermometer a7 are used to measure the temperature of humid gas and dry gas respectively, the model is CYT521F, the temperature range is -200~600°C, and the explosion-proof rating is EXdⅡCT6.

[0091] like Figure 4As shown, the distributed power grid-connected control unit 2 includes a computer A21, a hub 22, a box-type transformer 23, a collector bus 24, a filter 25, a 35kV bus 26, a main circuit breaker 27, a grid-side disconnect switch 28, a line-side disconnect switch 29, a load-side disconnect switch 210, a bus-side disconnect switch 211, a protection disconnect switch 212, a circuit breaker 213, a fuse 214, a voltage transformer 215, a total power meter 216, and a step-up transformer 217.

[0092] The computer A21 is used to store the metering results of the total power meter 216, as well as the gas flow rate, inlet temperature, outlet temperature, inlet pressure, and outlet pressure of multiple energy conversion units. It is used to issue control commands to the load-side disconnect switch 210, bus-side disconnect switch 211, and circuit breaker 213, and to issue control commands to the line-side disconnect switch 29, main circuit breaker 27, grid-side disconnect switch 28, and protection disconnect switch 212. It is also used for load calculation and power flow calculation. The hub 22 is used to collect the signal lines from the total power meter 216, gas flow meter 15, inlet thermometer 14, and outlet thermometer 113, and to collect the control lines from the load-side disconnect switch 210, bus-side disconnect switch 211, circuit breaker 213, line-side disconnect switch 29, main circuit breaker 27, grid-side disconnect switch 28, and protection disconnect switch 212. In this embodiment, the computer A21 is an RTX4090, and the hub 22 is a JT-4MFL, allowing access to 256 RS485 communication lines.

[0093] The box-type transformer 23 steps up the 0.4kV output voltage of the generator 18 to 10kV, with a transformation ratio of 0.4kV / 10kV. The collector bus 24 is used to collect the electrical energy output from multiple energy conversion units 1, with a voltage level of 10kV. The filter 25 is used to filter high-order harmonics in the line. The load-side disconnect switch 210, the bus-side disconnect switch 211, and the circuit breaker 213 are used to control the on / off state of the current output from each energy conversion unit 1. The step-up transformer 217 steps up the 10kV output voltage of the collector bus 24 to 35kV, with a transformation ratio of 10kV / 10kV. The 35kV bus 26 is used to collect the 35kV electrical energy output from the step-up transformer 217. The line-side disconnect switch 29, the main circuit breaker 27, and the grid-side disconnect switch 28 are used to control the on / off state of the current connected to the grid at the grid connection point. The total energy meter 216 is used to measure the amount of electricity connected to the grid at the grid connection point. The protection disconnect switch 212... The voltage transformer 215 is used to control whether it is connected to the 35kV bus 26. The fuse 214 is used to prevent the voltage transformer 215 and its leads from being faulty and affecting the high voltage system. The voltage transformer 215 is used to measure the voltage of the 35kV bus 26 and prevent overvoltage. In this embodiment, the filter 25 is of model XNAPF and can filter out harmonics in the range of 2 to 50. The circuit breaker 213 is of model ZW32 and has a rated voltage of 10kV. The main circuit breaker 27 is of model ZW7 and has a rated voltage of 35kV. The load-side disconnect switch 210 and the bus-side disconnect switch 211 are both of model GN19-10. The protection disconnect switch 212, the line-side disconnect switch 29, and the grid-side disconnect switch 28 are all of model GW5-35. The total energy meter 216 is of model DTSD341. The voltage transformer 215 is of model JDZX9-35. The fuse 214 is of model HRW12-35.

[0094] like Figure 5 As shown, the power quality management platform 3 includes a computer B31, a CAN adapter card 32, a CAN bus 33, a data acquisition card 34, a reactive power compensation controller 35, a reactive power compensation device 36, and an RS485 communication bus 37.

[0095] The computer B31 is used to store the output power, voltage, current, power factor, and three-phase voltage imbalance of each energy conversion unit, and to issue control commands for compensation capacity. The reactive power compensation controller 35 controls the reactive power compensation device 36 to output the required compensation capacity. The reactive power compensation device 36 is used to perform reactive power compensation on the low-voltage side of the box-type transformer 23 and at the grid connection point to ensure power quality. The CAN bus 33 is model BT1207, and the CAN adapter card 32 is used to convert the CAN interface to a USB interface. The model is CANalyst-Ⅱ. The RS485 communication bus 37 is model ADM-2542, and the data acquisition card 34 is used to acquire the signals measured by the parameter measuring instrument 111. The model is C-7017.

[0096] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the scope of the technology disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A pressure energy power generation system for a gas storage facility, characterized in that, include: A plurality of energy conversion units (1), a distributed power grid connection control unit (2), and a power quality management platform (3); the distributed power grid connection control unit (2) is connected to each of the energy conversion units (1), and the power quality management platform (3) is connected to each of the energy conversion units (1); the gas production ends of one or more gas storage injection and production wells in geographically close proximity are connected in parallel to the common gas production end of the gas storage injection and production station, and the output ends of one or more gas storage injection and production stations are connected in parallel to the energy conversion units (1).

2. The gas storage pressure energy power generation system as described in claim 1, characterized in that, The energy conversion unit (1) includes a gas purification device (11), an inlet pressure gauge (12), an inlet pressure regulating valve (13), an inlet thermometer (14), a gas flow meter (15), an expander (16), a speed controller (17), a generator (18), a current transformer (19), and an energy meter (110) connected in sequence. A parameter measuring instrument (111) is connected in parallel with the current transformer (19).

3. The gas storage pressure energy power generation system as described in claim 2, characterized in that, The energy conversion unit (1) also includes an outlet pressure regulating valve (112), an outlet thermometer (113), an outlet pressure gauge (114), and a gas valve (115) connected in sequence to the expander (16).

4. The gas storage pressure energy power generation system as described in claim 3, characterized in that, The energy conversion unit (1) is located in the gas storage and injection station. The output end of the power meter (110) in the energy conversion unit (1) is connected to the input end of the distributed power grid control unit (2). The output end of the gas valve (115) in the energy conversion unit (1) is connected to the input end of the gas pipeline. The signal end of the parameter measuring instrument (111) in the energy conversion unit (1) is connected to the input end of the power quality management platform (3). The signal end of the power meter (110) in the energy conversion unit (1) is connected to the input end of the power quality management platform (3).

5. The gas storage pressure energy power generation system as described in claim 2, characterized in that, The gas purification device (11) includes a pre-separator (a1), a pre-cooler (a2), a production separator (a3), a heat exchanger (a4), a wet gas digital thermometer (a5), and a low-temperature separator (a6) connected in sequence; the heat exchanger (a4) is also connected to a dry gas digital thermometer (a7).

6. The gas storage pressure energy power generation system as described in claim 5, characterized in that, In the gas purification device (11), the dry gas output end of the heat exchanger (a4) is connected to the pressurization system interface via the inlet pressure gauge (12). The dry gas output end of the heat exchanger (a4) in the gas purification device (11) is connected to the input end of the inlet pressure regulating valve (13) via the inlet pressure gauge (12). The output end of the inlet pressure regulating valve (13) is connected to one end of the gas flow meter (15) via the inlet thermometer (14). The other end of the gas flow meter (15) is connected to the input end of the expander (16). The inlet pressure gauge (12) is connected to the distributed power supply via a wireless signal. The computer of the grid-connected control unit (2) is connected to the hub (22) of the distributed power grid-connected control unit (2), and the signal terminal of the gas flow meter (15) is connected to the hub (22) of the distributed power grid-connected control unit (2). The screw of the expander (16) is connected to the input terminal of the speed regulator (17), the output terminal of the speed regulator (17) is connected to the screw of the generator (18), and the output terminal of the generator (18) is connected to the input terminal of the power meter (110) via the primary side of the current transformer (19). The output of the power meter (110) is connected to the input of the filter (25) in the distributed power grid control system; the secondary side of the current transformer (19) is connected to the input of the parameter measuring instrument (111); the signal end of the parameter measuring instrument (111) is connected to the data acquisition card (34) of the power quality management platform (3); the signal end of the power meter (110) is connected to the RS485 communication bus (37) of the power quality management platform (3); and the output of the expander (16) is connected to the input of the outlet pressure regulating valve (112). The output end of the outlet pressure regulating valve (112) is connected to one end of the outlet pressure gauge (114) via the outlet thermometer (113). The other end of the outlet pressure gauge (114) is connected to one end of the gas valve (115). The other end of the gas valve (115) is connected to the input end of the gas pipeline. One end of the outlet pressure gauge (114) is connected to the pressurization system interface. The other end of the outlet pressure gauge (114) is connected to the depressurization system interface. The outlet pressure gauge (114) is connected to the computer A (21) of the distributed power grid control unit (2) via a wireless signal.

7. The gas storage pressure energy power generation system as described in claim 5, characterized in that, The input end of the pre-separator (a1) is connected to the gas sampling interface. The output end of the pre-separator (a1) is connected to the input end of the production separator (a3) ​​via the precooler (a2). The output end of the production separator (a3) ​​is connected to the humid gas input end of the heat exchanger (a4). The humid gas output end of the heat exchanger (a4) is connected to the input end of the low-temperature separator (a6). The humid gas output end of the heat exchanger (a4) is connected to the input end of the humid gas digital thermometer (a5). The output end of the low-temperature separator (a6) is connected to the dry gas input end of the heat exchanger (a4). The dry gas output end of the heat exchanger (a4) is connected to the input end of the dry gas digital thermometer (a7).

8. The gas storage pressure energy power generation system as described in claim 1, characterized in that, The power quality management platform (3) includes: computer B (31), CAN adapter card (32), CAN bus (33), data acquisition card (34), reactive power compensation controller (35), reactive power compensation device (36), and RS485 communication bus (37); computer B (31) is connected to RS485 communication bus (37), CAN adapter card (32), and reactive power compensation controller (35) respectively; CAN adapter card (32) is connected to several CAN buses (33), and the CAN buses (33) are connected to several data acquisition cards (34) respectively; reactive power compensation controller (35) is connected to reactive power compensation device (36).

9. The gas storage pressure energy power generation system as described in claim 8, characterized in that, One end of the computer B (31) is connected to one end of the CAN bus (33) via the CAN adapter card (32). The other end of the CAN bus (33) is connected to one end of the data acquisition card (34). The other end of the data acquisition card (34) is connected to the signal terminal of the parameter measuring instrument (111) in the energy conversion unit (1). One end of the computer B (31) is connected to one end of the reactive power compensation controller (35). The computer B (31) transmits data with the computer B (31) of the distributed power grid control unit (2) via wireless communication. The other end of the reactive power compensation controller (35) is connected to the control terminal of the reactive power compensation device (36). The output terminal of the reactive power compensation device (36) is connected to the reactive power compensation interface of the distributed power grid control system.

10. The gas storage pressure energy power generation system as described in claim 1, characterized in that, The distributed power grid-connected control unit (2) includes: computer A (21), hub (22), box-type transformer (23), collector bus (24), filter (25), 35kV bus (26), main circuit breaker (27), grid-side disconnect switch (28), line-side disconnect switch (29), load-side disconnect switch (210), bus-side disconnect switch (211), protection disconnect switch (212), circuit breaker (213), fuse (214), voltage transformer (215), total power meter (216), and step-up transformer (217); the output end of the filter (25) is connected to a reactive power compensation interface. The output of filter (25) is connected to a low-voltage load interface. The output of filter (25) is connected to the input of box-type transformer (23). The output of box-type transformer (23) is connected to one end of circuit breaker (213) via load-side disconnect switch (210). The other end of circuit breaker (213) is connected to one end of collector bus (24) via bus-side disconnect switch (211). The other end of collector bus (24) is connected to one end of 35kV bus (26) via step-up transformer (217). The other end of 35kV bus (26) is connected to a 35kV load interface. The other end of 35kV bus (26) is connected to line-side disconnect switch (211). The line-side disconnector (29) is connected to one end of the main circuit breaker (27); the other end of the main circuit breaker (27) is connected to one end of the grid-side disconnector (28), the other end of the grid-side disconnector (28) is connected to one end of the total power meter (216), the other end of the total power meter (216) is connected to the battery interface via the grid connection point reactive power compensation interface, and the other end of the total power meter (216) is connected to the grid via the grid connection point reactive power compensation interface; the control end of the line-side disconnector (29) is connected to computer A (21) via hub (22), and the control end of the grid-side disconnector (28) is connected to computer A (21) via hub (22). 21), the computer A (21) transmits data through the wireless communication and power quality management platform (3) computer A (21); the control terminal of the main circuit breaker (27) is connected to the computer A (21) via the hub (22), and the signal terminal of the total power meter (216) is connected to the computer A (21) via the hub (22); one end of the 35kV bus (26) is connected to one end of the fuse (214) via the protection disconnect switch (212), the other end of the fuse (214) is connected to the voltage transformer (215), and the control terminal of the protection disconnect switch (212) is connected to the computer A (21) via the hub (22).

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