Coupling electricity storage and sCO2 circulation gas turbine unit electric energy supply system and dispatching method

Abstract

The invention relates to a gas turbine unit electric energy supply system coupled with electricity storage and sCO2 circulation and a dispatching method, and belongs to the technical field of electric power. The system comprises a non-dispatchable electric energy system and a dispatchable electric energy system, the dispatchable electric energy system comprises a gas turbine power generation system, an sCO2 power cycle power generation system, an electricity storage device and a water electrolysis hydrogen production device, and the input end of the electricity storage device and the input end of the water electrolysis hydrogen production device are connected with the non-dispatchable electric energy system through a controller A; the output end of the electricity storage device, the gas turbine power generation system and the sCO2 power cycle power generation system are connected with a power grid through a controller B. The output end of the water electrolysis hydrogen production device is connected with a hydrogen storage tank, the gas turbine power generation system, the sCO2 power cycle power generation system and the undispatchable electric energy system are connected with the power grid. According to the invention, the impact of the randomness and volatility of new energy power generation such as wind and light on the power grid is solved, the peak regulation capability of the power system is improved, and the power supply quality and operation safety of the power grid are guaranteed.

Description

Technical Field

[0001] The present invention relates to the field of electric power technology, in particular to coupling power storage and sCO 2 The invention relates to a power supply system and a dispatching method for a gas turbine unit with a cycle. Background Art

[0002] With the rapid development of intermittent renewable energy such as wind and solar, the large-scale grid connection of renewable energy will have an impact on the stable operation of the power system. Although renewable energy can replace conventional energy to a certain extent to reduce the standby capacity of the power system, renewable energy power generation represented by wind and solar has strong randomness, volatility and anti-peak characteristics. At the same time, nuclear power and external power basically do not participate in peak regulation throughout the year, resulting in a serious shortage of flexible regulation resources that the power grid can call on. At present, the peak regulation of the power grid is still dominated by coal-fired power generation, but the peak regulation response time of general coal-fired units is long, which is poorly matched with the rapid peak regulation demand of the power grid.

[0003] Therefore, it is crucial to improve the power system's ability to absorb renewable energy power generation such as wind power and photovoltaics. The absorption capacity is mainly affected by the composition of the regional power structure and the output regulation characteristics of various power sources. Therefore, it is necessary to improve the power system's absorption capacity by optimizing the power structure and improving the power output regulation characteristics. Gas turbines can quickly respond to load changes in the power system and provide flexible peak and frequency regulation capabilities. Therefore, in order to improve the reliability and stability of the power system, it is necessary to conduct in-depth research and optimization in terms of power structure, power output regulation characteristics and energy storage technology. Summary of the invention

[0004] The present invention aims to provide a coupled power storage and sCO 2 The circulating gas turbine unit power supply system and dispatching method can solve the impact of the randomness and volatility of wind and solar power generation on the power grid, improve the peak-shaving capacity of the power system, and ensure the power supply quality and operational safety of the power grid.

[0005] In order to achieve the above object, the present invention is implemented through the following technical solutions: Coupling energy storage and sCO 2 The power supply system of the gas turbine unit with a cycle, including a non-dispatchable power system and a dispatchable power system; Dispatched power systems include gas turbine power generation systems, sCO 2 The power cycle power generation system, the power storage device and the water electrolysis hydrogen production device, the input end of the power storage device and the water electrolysis hydrogen production device is connected to the non-dispatchable power system through the controller A, and the output end of the power storage device, the gas turbine power generation system and the sCO 2 The power cycle power generation system is connected to the power grid through controller B, and the output end of the water electrolysis hydrogen production device is connected to the hydrogen storage tank, the gas turbine power generation system and the sCO2 The power cycle power generation system is connected, and the non-dispatchable electric energy system is connected to the power grid.

[0006] Furthermore, the gas turbine power generation system includes an air compressor, a combustion chamber, a gas turbine and a generator A. The air compressor is coaxially connected to the gas turbine and the generator A. The air compressor outlet is connected to the combustion chamber inlet. The combustion chamber fuel inlet is connected to a natural gas supply pipeline and a water electrolysis hydrogen production device. The combustion chamber outlet is connected to the gas turbine inlet. The gas turbine outlet discharges the combustion flue gas after expansion and work.

[0007] Furthermore, the sCO 2 The power cycle power generation system includes CO 2 Turbine, compressor, generator B, heat exchanger, regenerator and precooler, CO 2 The turbine, generator B and compressor are connected coaxially, CO 2 The outlet of the turbine is connected to the inlet of the hot side of the heat exchanger, the outlet of the hot side of the heat exchanger is connected to the inlet of the hot side of the precooler, the outlet of the hot side of the precooler is connected to the inlet of the compressor, the outlet of the compressor is connected to the inlet of the cold side of the heat exchanger, the outlet of the cold side of the heat exchanger is connected to the inlet of the cold side of the heat exchanger, and the outlet of the cold side of the heat exchanger is connected to the CO 2 The inlet of the turbine forms a closed loop; the heat exchanger is connected to the heating circulation pipeline and CO 2 The supply pipeline and the precooler are connected with a cooling circulation pipeline.

[0008] Furthermore, the heating circulation pipeline includes a hydrogen combustion furnace, the hot side outlet of the heat exchanger is connected to the combustion chamber inlet and the hydrogen combustion furnace inlet through valve A and valve B respectively, the combustion chamber outlet and the hydrogen combustion furnace outlet are both connected to the hot side inlet of the heat exchanger, and the hydrogen combustion furnace is also connected to a water electrolysis hydrogen production device.

[0009] Furthermore, the cooling circulation pipeline includes a pump and a cooling water tower, the outlet side of the precooler water channel is connected to the inlet of the cooling water tower flow channel, and the outlet of the cooling water tower flow channel is connected to the inlet side of the precooler water channel through the pump.

[0010] Furthermore, CO 2 The supply pipeline includes a carbon dioxide storage tank and a booster pump. The outlet side of the carbon dioxide storage tank is connected to the inlet of the booster pump, and the outlet of the booster pump is connected to the cold side inlet of the heat exchanger.

[0011] Furthermore, the non-dispatchable electric energy system is a renewable energy power generation system, including wind power generation and photovoltaic power generation.

[0012] The above coupled energy storage and sCO 2 The scheduling method of the power supply system of the gas turbine unit with a cycle comprises the following steps: (1) When the renewable energy power generation system is generating electricity, it monitors the power demand of the power grid in real time. When the load of the power grid is low and the power demand is insufficient, the electrical signal is transmitted to the controller A, and the controller A controls the renewable energy power generation system to direct the excess electric energy to the power storage device and the water electrolysis hydrogen production device; (2) In the gas turbine power generation system, the gas turbine uses natural gas as fuel and mixes a certain proportion of hydrogen produced by the water electrolysis hydrogen production device, which is mixed with the air compressed by the air compressor and burned in the combustion chamber. The released heat energy drives the gas turbine to rotate, which in turn drives the generator A to generate electricity, and the generated electricity is sent to the power grid; (3) sCO 2 In the power cycle power generation system, the high-temperature and high-pressure supercritical carbon dioxide flowing out from the cold side of the heat exchanger passes through the CO 2 The turbine expands and does work to become high-temperature, low-pressure carbon dioxide, which then flows through the regenerator and precooler to cool down and become low-temperature, low-pressure carbon dioxide. It then enters the compressor for compression and becomes low-temperature, high-pressure carbon dioxide. It then flows through the regenerator for heat recovery. At this time, the circulating working medium carbon dioxide is in a low-temperature, high-pressure state. Finally, it enters the heat exchanger for heating, making it in a high-temperature, high-pressure supercritical state, completing the sCO 2 Power cycle; (4) Peak load regulation is performed based on the power generation method of the above steps (1), (2), and (3).

[0013] Furthermore, in step (4), it is assumed that the peak load power required by the power grid is W e , requiring that e The required electrical power W is achieved within the time e , the amount of electricity stored in the storage device is G, and the discharge power is P f , the power of the gas turbine power generation system is a piecewise function, which at the start time t s The internal power is P s , after stabilization, the electric power P w ;sCO 2 The power of the power cycle power generation system is also a piecewise function, which is c The internal power is P c , after stabilization, the electric power P o ; The steps of peak shaving method are as follows: When G ≥ P f t e ≥W e When the peak load is high, only the power storage device is used for peak load regulation; When P f t e <W e , and P f t e +P ct c +P o (t e -t c )≥W e When using energy storage devices and sCO 2 Power cycle power generation systems jointly carry out grid peak regulation; When P f t e <W e , and P f t e +P s t s +P w (t e -t s )≥W e When the power grid peaks, the power storage device and gas turbine power generation system are used together to carry out peak load regulation of the power grid; When P f t e ≥W e , P f t e >G, and P f t e +P c t c +P o (t e -t c )≥W e When using energy storage devices and sCO 2 The power cycle power generation system performs grid peak regulation; When P f t e ≥W e , P f t e >G, and P f t e +P s t s +P w (t e -t s )≥W e , using power storage devices and gas turbine power generation systems to load peak on the grid; When P f t e +P c t c +P o (t e -t c )+P s t s +P w (t e -t s )≥We When the gas turbine power generation system and sCO 2 The power cycle power generation system and power storage device are all started to jointly carry out grid peak regulation; When P f t e +P c t c +P o (t e -t c )+P s t s +P w (t e -t s )<W e , then the peak-shaving power supply system cannot meet the peak-shaving demand of the power grid within the demand time; When P f t e ≥W e , P f t e >G,G+P c t c +P o (t e -t c )≥W e , and G+P s t s +P w (t e -t s )≥W e When sCO 2 Power cycle power generation system or gas turbine power generation system is selected.

[0014] Further, the steps for selecting the best are as follows: The shortest time that can achieve the peak load requirement is compared between the two through the objective function, and the objective function is determined by the following formula: In the formula, For the peak load time of gas turbine power generation system, For sCO 2 The peak load time of the power cycle power generation system, min is the minimum value, and After comparison, the minimum value system is selected for peak regulation.

[0015] The advantages of the present invention are: 1. The present invention couples electricity storage and sCO 2The design of the power cycle makes the power supply system more flexible and responsive. Traditional power systems often rely on fossil fuel power generation. When faced with rapid changes brought about by renewable energy such as wind and solar, the regulation measures are not responsive enough. 2 The design of the cycle system allows it to be started or shut down quickly in a shorter time. Compared with traditional steam turbines, this fast response capability makes sCO 2 The system can respond to instantaneous changes in power demand in a timely manner. This is particularly important when the grid load is peaking, as additional power can be quickly provided to help balance supply and demand.

[0016] 2. The present invention couples the power storage device with the water electrolysis hydrogen production device. When the demand for electricity is low, the system can store the excess electricity generated by renewable energy, and quickly release the stored electricity and hydrogen to supply the power grid at the peak demand time, providing the necessary peak-shaving service for the power grid and reducing the occurrence of wind and solar power abandonment. This flexible peak-shaving mechanism not only improves the overall efficiency of the system, but also reduces the cost of power generation and maximizes economic benefits.

[0017] 3. The dispatching method of the present invention can store electricity, sCO 2 The technologies of cycle and gas turbine are organically combined to quickly coordinate the three rapid peak-shaving systems to absorb fluctuations within the power grid and maintain the stability of power supply to the power grid, thereby reducing the occurrence of equipment damage or shutdown due to power quality problems. This positive effect on improving power supply quality can ensure power stability while enjoying the clean electricity brought by renewable energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a schematic diagram of the scheduling process of the present invention. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0020] Example 1 This embodiment provides a coupled power storage and sCO 2 The power supply system of the gas turbine unit with a cycle includes a non-dispatchable power system and a dispatchable power system. Please refer to Figure 1 .

[0021] Dispatched power systems include gas turbine power generation systems, sCO 2The power cycle power generation system, the power storage device and the water electrolysis hydrogen production device, the input end of the power storage device and the water electrolysis hydrogen production device is connected to the non-dispatchable power system through the controller A, the output end of the power storage device, the gas turbine power generation system and the sCO 2 The power cycle power generation system is connected to the power grid through controller B, and the output end of the water electrolysis hydrogen production device is connected to the hydrogen storage tank, the gas turbine power generation system and the sCO 2 Power cycle power generation system, non-dispatchable electric energy system connected to the power grid.

[0022] The gas turbine power generation system includes an air compressor, a combustion chamber, a gas turbine and a generator A. The air compressor is coaxially connected to the gas turbine and the generator A. The outlet of the air compressor is connected to the inlet of the combustion chamber. The fuel inlet of the combustion chamber is connected to the natural gas supply pipeline and the water electrolysis hydrogen production device. The outlet of the combustion chamber is connected to the inlet of the gas turbine. The outlet of the gas turbine discharges the combustion flue gas after expansion and work. The natural gas supply pipeline is used to supply methane. The combustion chamber will be mixed with a part of hydrogen to improve efficiency. Therefore, the hydrogen produced by the water electrolysis hydrogen production device is introduced and mixed into the natural gas.

[0023] sCO 2 The power cycle power generation system includes CO 2 Turbine (the system operating fluid is CO 2 , so CO is selected 2 turbine), compressor, generator B, heat exchanger, regenerator and precooler, CO 2 The turbine, generator B and compressor are connected coaxially, CO 2 The turbine drives the shaft to rotate and drives the generator B to generate electricity. At the same time, the same shaft drives the compressor to rotate and consume power. 2 The outlet of the turbine is connected to the inlet of the hot side of the heat exchanger, the outlet of the hot side of the heat exchanger is connected to the inlet of the precooler, the outlet of the hot side of the precooler is connected to the inlet of the compressor, the outlet of the compressor is connected to the inlet of the cold side of the heat exchanger, the outlet of the cold side of the heat exchanger is connected to the inlet of the turbine, forming a closed loop, the heat exchanger is connected to the heating circulation pipeline, the precooler is connected to the cooling circulation pipeline and the CO 2 Supply line.

[0024] The heating circulation pipeline includes a hydrogen combustion furnace. The hot side outlet of the heat exchanger is connected to the combustion chamber and the hydrogen combustion furnace inlet through valve A and valve B respectively. The combustion chamber and the hydrogen combustion furnace outlet are connected to the hot side inlet of the heat exchanger. The hydrogen combustion furnace is connected to a water electrolysis hydrogen production device.

[0025] In the heating circulation pipeline, when the gas turbine power generation system is not started, valve A is closed and valve B is opened, and hydrogen is introduced into the hydrogen combustion furnace for combustion and heat release, and the heated circulating working fluid enters the heat exchanger for heating; when the gas turbine power generation system is started, valve B is closed and valve A is opened, and natural gas mixed with hydrogen enters the combustion chamber for combustion and heat release to heat the circulating working fluid.

[0026] The cooling circulation pipeline includes a pump and a cooling water tower. The outlet side of the precooler water channel is connected to the inlet of the cooling water tower flow channel, and the outlet of the cooling water tower flow channel is connected to the inlet side of the precooler water channel through a pump.

[0027] In the cooling circulation pipeline, the cooling water absorbs the heat released by the cooling high-temperature carbon dioxide working medium after heat exchange in the precooler and becomes high-temperature cooling water. It is then sent to the cooling tower through a pipeline for cooling. The cooling method in the cooling tower is natural ventilation cooling, which uses the air convection effect formed by the air mass density difference inside and outside the cooling tower to achieve ventilation and cool the high-temperature cooling water. The cooling water after the cooling tower enters the pump for pressurization and then circulates again into the precooler to cool the high-temperature carbon dioxide working medium to complete the cooling cycle.

[0028] CO 2 The supply pipeline includes a carbon dioxide storage tank and a booster pump. The outlet side of the carbon dioxide storage tank is connected to the inlet of the booster pump, and the outlet of the booster pump is connected to the cold side inlet of the heat exchanger.

[0029] CO 2 In the supply pipeline, the CO stored in the carbon dioxide tank 2 After entering the booster pump for pressurization, it enters the heat exchanger for heating. During operation, the system will have CO 2 The subsequent required CO 2 , will continue to be provided by the carbon dioxide storage tank to complete the CO 2 supply.

[0030] The non-dispatchable electric energy system is a renewable energy power generation system, including wind power generation and photovoltaic power generation.

[0031] Example 2 This embodiment provides a scheduling method for the above-mentioned gas turbine unit power supply system coupled with power storage and sCO2 cycle, and the steps are as follows: (1) In the renewable energy power generation system, renewable energy such as wind energy and solar energy often have a certain amount of excess electricity during their power generation process because their power generation capacity is affected by many factors. When the renewable energy power generation system is generating electricity, it monitors the power demand of the power grid in real time. When the power grid load is low and the power demand is insufficient, the electrical signal is transmitted to the controller A. The controller A controls the renewable energy power generation system to guide the excess power to the power storage device and the water electrolysis hydrogen production device to achieve the optimal resource allocation; The electrolysis of water to produce hydrogen is an existing device. When excess current from the renewable energy power generation system passes through the electrolyzer, an oxidation reaction occurs at the positive electrode to release oxygen; a reduction reaction occurs at the negative electrode to release hydrogen. The greater the current used, the faster the rate of the electrolysis reaction, and the more hydrogen and oxygen are generated. In this way, the excess electrical energy can be efficiently converted into chemical energy, stored in hydrogen for long-term storage, used for combustion in hydrogen furnaces and natural gas mixed with hydrogen to enter the combustion chamber for combustion; In the power storage device, when the excess current of the renewable energy power generation system passes through the battery group (including lithium batteries, lead-acid batteries, etc., but not limited to), the excess electric energy is stored. When the grid demand increases and the renewable energy supply is insufficient, the battery group can quickly release energy to supply instantaneous demand and provide electricity. It is used to provide a fast and stable power supply, forming a complementary relationship with hydrogen storage, and is suitable for short-term and long-term energy storage needs; (2) In the gas turbine power generation system, the gas turbine uses natural gas as fuel and mixes a certain proportion of hydrogen produced by the water electrolysis hydrogen production device, which is mixed with the air compressed by the air compressor and burned in the combustion chamber. The released heat energy drives the gas turbine to rotate, which in turn drives the generator A to generate electricity, and the generated electricity is sent to the power grid; (3) sCO 2 In the power cycle power generation system, the high-temperature and high-pressure supercritical carbon dioxide flowing out from the cold side of the heat exchanger passes through the CO 2 The turbine expands and does work to become high-temperature, low-pressure carbon dioxide, which then flows through the regenerator and precooler to cool down and become low-temperature, low-pressure carbon dioxide. It then enters the compressor for compression and becomes low-temperature, high-pressure carbon dioxide. It then flows through the regenerator for heat recovery. At this time, the circulating working medium carbon dioxide is in a low-temperature, high-pressure state. Finally, it enters the heat exchanger for heating, making it in a high-temperature, high-pressure supercritical state, completing the sCO 2 Power cycle; (4) Based on the power generation methods of the above steps (1), (2), and (3), peak load regulation is performed. The peak load regulation power required by the power grid is 20MW, and the peak load regulation task is required to be completed within 2 hours. The power stored in the power storage device is 10MW, and the discharge power is 4MW / h; the start-up time of the gas turbine power generation system is 0.5h, the power is 2MW / h, and the power after stabilization is 10MW / h; sCO 2 The power cycle power generation system has a startup time of 0.2h, an electric power of 2MW / h, and an electric power of 9MW / h after stabilization.

[0032] Through the judgment of controller B, when P f t e <W e , and P f t e +P c t c +Po (t e -t c )≥W e When using energy storage devices and sCO 2 The power cycle power generation system jointly performs grid peak regulation; at the same time, it also satisfies P f t e +P s t s +P w (t e -t s )≥W e When the power storage device and the gas turbine power generation system are used to jointly load the grid peak; when both schemes are met, the controller B controls the sCO 2 The power cycle power generation system and the gas turbine power generation system are selected and compared by the following objective function to see the shortest time for the peak load regulation requirement. The objective function is determined by the following formula: By calculation, we can get ,in , ,because Therefore, the use of energy storage devices and sCO 2 The power cycle power generation system jointly performs grid peak regulation.

[0033] Scheduling process Figure 2 As shown, the system modules of this embodiment are closely connected and interdependent, and an efficient and stable power supply peak-shaving system is constructed. In the non-dispatched power system, when the power demand is low, the power generated by the renewable energy power generation system is used for power storage and water electrolysis to produce hydrogen. When the power demand is strong, in order to avoid the impact of insufficient part of the non-dispatched power on the power grid, the control system distributes the power supply tasks through the peak-shaving method by receiving the electrical signal of the power supply demand sent by the power grid to the control system, and uses the dispatchable power system. According to the power supply task, the gas turbine power generation system, the sCO2 power cycle power generation system and the power storage device are organically combined according to the peak-shaving method to provide the power grid with the power required for peak-shaving. At the same time, the hydrogen generated and stored by the water electrolysis hydrogen production device is used as fuel hydrogen blending for the gas turbine power generation system and fuel supply for the sCO2 power cycle power generation system to provide fuel support.

[0034] In summary, this embodiment can effectively solve the impact of renewable energy such as wind and solar on the power grid, and utilize the coupling of power storage devices with fast start-stop and peak-shaving capabilities, gas turbine power generation systems and sCO 2The power cycle power generation system can use the controller B to quickly and flexibly allocate power supply through the peak load method at the peak time of the power grid demand, thereby improving the overall efficiency of the power supply system, reducing the cost of power generation, and maximizing economic benefits, so that the power grid can enjoy the clean electricity brought by renewable energy while ensuring the stability of the power grid.

[0035] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A gas turbine unit power supply system coupled with power storage and sCO2 cycle, characterized in that: Including non-dispatchable power system and dispatchable power system; The dispatchable electric energy system includes a gas turbine power generation system, a sCO2 power cycle power generation system, an electricity storage device and a water electrolysis hydrogen production device. The input ends of the electricity storage device and the water electrolysis hydrogen production device are linked to the non-dispatchable electric energy system through a controller A, the output ends of the electricity storage device, the gas turbine power generation system and the sCO2 power cycle power generation system are connected to the power grid through a controller B, the output end of the water electrolysis hydrogen production device is respectively connected to the hydrogen storage tank, the gas turbine power generation system and the sCO2 power cycle power generation system, and the non-dispatchable electric energy system is connected to the power grid.

2. The gas turbine unit power supply system coupled with power storage and sCO2 cycle according to claim 1, characterized in that: The gas turbine power generation system includes an air compressor, a combustion chamber, a gas turbine and a generator A. The air compressor is coaxially connected to the gas turbine and the generator A. The air compressor outlet is connected to the combustion chamber inlet. The combustion chamber fuel inlet is connected to a natural gas supply pipeline and a water electrolysis hydrogen production device. The combustion chamber outlet is connected to the gas turbine inlet. The gas turbine outlet discharges the combustion flue gas after expansion and work.

3. The gas turbine unit power supply system coupled with power storage and sCO2 cycle according to claim 2, characterized in that: The sCO2 power cycle power generation system includes a CO2 turbine, a compressor, a generator B, a heat exchanger, a regenerator and a precooler. The CO2 turbine, the generator B and the compressor are coaxially connected. The outlet of the CO2 turbine is connected to the hot side inlet of the regenerator, the hot side outlet of the regenerator is connected to the hot side inlet of the precooler, the hot side outlet of the precooler is connected to the compressor inlet, the compressor outlet is connected to the cold side inlet of the regenerator, the cold side outlet of the regenerator is connected to the cold side inlet of the heat exchanger, and the cold side outlet of the heat exchanger is connected to the inlet of the CO2 turbine to form a closed loop; the heat exchanger is connected to a heating circulation pipeline and a CO2 supply pipeline, and the precooler is connected to a cooling circulation pipeline.

4. The gas turbine unit power supply system coupled with power storage and sCO2 cycle according to claim 3 is characterized in that: The heating circulation pipeline includes a hydrogen combustion furnace, the hot side outlet of the heat exchanger is connected to the combustion chamber inlet and the hydrogen combustion furnace inlet through valve A and valve B respectively, the combustion chamber outlet and the hydrogen combustion furnace outlet are both connected to the hot side inlet of the heat exchanger, and the hydrogen combustion furnace is also connected to a water electrolysis hydrogen production device.

5. The gas turbine unit power supply system coupled with power storage and sCO2 cycle according to claim 3 is characterized in that: The cooling circulation pipeline includes a pump and a cooling water tower. The outlet side of the precooler water channel is connected to the inlet of the cooling water tower flow channel. The outlet of the cooling water tower flow channel is connected to the inlet side of the precooler water channel through the pump.

6. The gas turbine unit power supply system coupled with power storage and sCO2 cycle according to claim 3 is characterized in that: The CO2 supply pipeline comprises a carbon dioxide storage tank and a booster pump, the outlet side of the carbon dioxide storage tank is connected to the inlet of the booster pump, and the outlet of the booster pump is connected to the cold side inlet of the heat exchanger.

7. The gas turbine unit power supply system coupled with power storage and sCO2 cycle according to claim 3 is characterized in that: The non-dispatchable electric energy system is a renewable energy power generation system, including wind power generation and photovoltaic power generation.

8. The method for dispatching a gas turbine unit power supply system coupled with power storage and sCO2 cycle according to any one of claims 3 to 7, characterized in that: Here are the steps: (1) When the renewable energy power generation system is generating electricity, it monitors the power demand of the power grid in real time. When the load of the power grid is low and the power demand is insufficient, the electrical signal is transmitted to the controller A, and the controller A controls the renewable energy power generation system to direct the excess electric energy to the power storage device and the water electrolysis hydrogen production device; (2) In the gas turbine power generation system, the gas turbine uses natural gas as fuel and mixes a certain proportion of hydrogen produced by the water electrolysis hydrogen production device, which is mixed with the air compressed by the air compressor and burned in the combustion chamber. The released heat energy drives the gas turbine to rotate, which in turn drives the generator A to generate electricity, and the generated electricity is sent to the power grid; (3) In the sCO2 power cycle power generation system, the high-temperature, high-pressure, supercritical carbon dioxide flowing out of the cold side of the heat exchanger is expanded by the CO2 turbine to become high-temperature, low-pressure carbon dioxide, and then flows through the regenerator and precooler to cool down to become low-temperature, low-pressure carbon dioxide, and then enters the compressor for compression to become low-temperature, high-pressure carbon dioxide, and then flows through the regenerator for heat recovery. At this time, the circulating working fluid carbon dioxide is in a low-temperature, high-pressure state, and finally enters the heat exchanger for heating, so that it is in a high-temperature, high-pressure, supercritical state, completing the sCO2 power cycle; (4) Peak load regulation is performed based on the power generation method of the above steps (1), (2), and (3).

9. The method for dispatching a gas turbine unit power supply system coupled with power storage and sCO2 cycle according to claim 8, characterized in that: In step (4), it is assumed that the peak load power required by the power grid is W e , requiring that e The required electrical power W is achieved within the time e , the amount of electricity stored in the storage device is G, and the discharge power is P f , the power of the gas turbine power generation system is a piecewise function, which at the start time t s The internal power is P s , after stabilization, the electric power P w ; The power of the sCO2 power cycle power generation system is also a piecewise function, which is at the start time t c The internal power is P c , after stabilization, the electric power P o ; The steps of peak shaving method are as follows: When G ≥ P f t e ≥W e When the peak load is high, only the power storage device is used for peak load regulation; When P f t e <W e , and P f t e +P c t c +P o (t e -t c )≥W e When the power is high, the power storage device and sCO2 power cycle power generation system are used to jointly load the power grid; When P f t e <W e , and P f t e +P s t s +P w (t e -t s )≥W e When the power grid peaks, the power storage device and gas turbine power generation system are used together to carry out peak load regulation of the power grid; When P f t e ≥W e , P f t e >G, and P f t e +P c t c +P o (t e -t c )≥W e When the power is high, the power storage device and sCO2 power cycle power generation system are used to load the power grid; When P f t e ≥W e , P f t e >G, and P f t e +P s t s +P w (t e -t s )≥W e , using power storage devices and gas turbine power generation systems to load peak on the grid; When P f t e +P c t c +P o (t e -t c )+P s t s +P w (t e -t s )≥W e When the power generation system of the gas turbine, the sCO2 power cycle power generation system and the power storage device are all started to jointly carry out the peak load regulation of the power grid; When P f t e +P c t c +P o (t e -t c )+P s t s +P w (t e -t s )<W e , then the peak-shaving power supply system cannot meet the peak-shaving demand of the power grid within the demand time; When P f t e ≥W e , P f t e >G,G+P c t c +P o (t e -t c )≥W e , and G+P s t s +P w (t e -t s )≥W e When choosing a power generation system, it is necessary to select the sCO2 power cycle power generation system or the gas turbine power generation system.

10. The method for dispatching the power supply system of the gas turbine unit coupled with power storage and sCO2 cycle according to claim 9, characterized in that: The steps of selecting the best are as follows: The shortest time that can achieve the peak load requirement is compared between the two through the objective function, and the objective function is determined by the following formula: In the formula, For the peak load time of gas turbine power generation system, is the peak load time of sCO2 power cycle power generation system, min is the minimum value, and After comparison, the minimum value system is selected for peak regulation.

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