Stable power generation system based on pumped storage unit

Abstract

The stable power generation system comprises an upper reservoir, a lower reservoir, a water conveying system, electromechanical equipment, electrical equipment, a control system and an auxiliary system, the upper reservoir is used for storing water at a high position and providing a water source for a water turbine during power generation, and the upper reservoir is usually built on a high terrain such as a mountaintop or a valley; the lower reservoir is located at the lower position and used for containing water pumped from the lower reservoir in the water pumping working condition. The stable power generation system based on the pumped storage unit can realize conversion from a static state to a full-load power generation state or conversion from a power generation state to a pumping state in a short time, rapidly responds to rapid change of a power grid load, effectively adjusts supply and demand balance of a power system, and improves the power generation efficiency. And by accurately controlling the guide vane opening of the water turbine and the exciting current of the generator motor, the generated power can be accurately adjusted, so that the generated power is accurately matched with the load requirement of a power grid, the frequency of a power system is maintained to be stabilized within a specified range, and the electric energy quality is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of pumped - storage unit power generation, and particularly to a stable power generation system based on pumped - storage units. Background Technique

[0002] With the rapid development of the new - energy industry, the power system's requirements for flexible stability are increasing day by day; pumped - storage, as the safest, most stable, mature, environmentally friendly, and economical energy - storage method at present, plays a key role in maintaining grid stability; in recent years, China has made remarkable progress in the field of pumped - storage technology, such as the 1:1 rotor of the 300 - megawatt variable - speed pumped - storage unit generator motor successfully passing the runaway test, and the first domestic large - scale AC - excited variable - speed pumped - storage unit successfully put into operation and generating electricity at the Hebei Fengning Pumped - Storage Power Station, etc.; these achievements have laid a solid foundation for the development of a stable power generation system based on pumped - storage units.

[0003] However, these new energies have inherent characteristics such as volatility and randomness. After being connected to the grid on a large scale, they have brought huge challenges to the safe and stable operation of the power system; for example, when the wind is unstable or the light intensity changes, the power generation power of new energies will fluctuate greatly, which may lead to instability of the grid frequency and voltage, and even cause power - outage accidents. Therefore, we propose a stable power generation system based on pumped - storage units to solve the problems raised above. Summary of the Invention

[0004] The purpose of the present invention is to provide a stable power generation system based on pumped - storage units to solve the problems raised in the above background technique, that is, new energies have inherent characteristics such as volatility and randomness. After being connected to the grid on a large scale, they have brought huge challenges to the safe and stable operation of the power system; for example, when the wind is unstable or the light intensity changes, the power generation power of new energies will fluctuate greatly, which may lead to instability of the grid frequency and voltage, and even cause power - outage accidents.

[0005] To achieve the above object, the present invention provides the following technical solutions: A stable power generation system based on a pumped-storage unit, comprising an upper reservoir, a lower reservoir, a water conveyance system, mechanical and electrical equipment, electrical equipment, a control system, and an auxiliary system. The upper reservoir is used to store water at a high altitude and provide water source for the water turbine during power generation, usually built on high terrains such as mountaintops or valleys. The lower reservoir is located at a lower position and is used to accommodate the water pumped up from the lower reservoir during the pumping operation, and receive the tail water discharged by the water turbine during the power generation operation. The water conveyance system is responsible for safely and efficiently guiding the water in the upper reservoir to the water turbine, and at the same time conveying the tail water of the water turbine to the lower reservoir, ensuring the smooth circulation of the water flow, reducing the head loss. The mechanical and electrical equipment includes a water turbine, a motor-generator, a pump, a governor, and an excitation device, which work together to achieve the conversion between electrical energy and mechanical energy and the precise control of the power generation process. The electrical equipment includes a main transformer, switchgear, busbars, and transmission lines. The control system includes a monitoring system and a protection system. The auxiliary system includes an oil system, a water system, and a gas system.

[0006] Preferably, the water conveyance system includes penstocks, tunnels, etc., which are used to connect the upper reservoir, the lower reservoir, and the water turbine. During the power generation operation, the water in the upper reservoir is safely, quickly, and efficiently guided to the water turbine, enabling the energy of the water flow to be maximally transferred to the water turbine, driving the water turbine to rotate, and providing power for power generation.

[0007] Preferably, various protection devices are usually provided in the water conveyance system, such as safety valves, surge shafts, etc. The safety valve can automatically open when the water pressure is too high, releasing the excess pressure to prevent the pipes and equipment from being damaged due to overpressure. The surge shaft can quickly adjust the water level and pressure during load changes, buffering the pressure fluctuations of the water flow, protecting the water turbine and other equipment from the impact of phenomena such as water hammer, and ensuring the safe operation of the unit.

[0008] Preferably, the water turbine in the mechanical and electrical equipment is a device that converts the energy of water into mechanical energy. In a pumped-storage power station, during power generation, the water in the upper reservoir flows through the water conveyance system to the water turbine, and the water flow impacts the runner of the water turbine, causing the runner to rotate, thereby converting the gravitational potential energy and kinetic energy of the water into the mechanical energy of the runner, providing rotational power for the motor-generator.

[0009] Preferably, the main function of the governor in the mechanical and electrical equipment is to adjust the guide vane opening of the water turbine. It automatically controls the opening and closing degree of the guide vanes according to the operating state of the unit and the load changes of the power grid, and then precisely controls the water flow rate entering the water turbine. When the power grid load increases, the governor increases the guide vane opening, allowing more water flow to enter the water turbine, increasing the output of the water turbine to meet the power demand of the power grid.

[0010] Preferably, when the main transformer in the electrical equipment is in the power generation mode, it raises the relatively low voltage (usually dozens of kilovolts) generated by the generator motor to a high voltage level suitable for grid transmission, generally 110 kV or above. This can reduce the current during power transmission. According to Joule's law Q = I²Rt, it reduces the power loss on the transmission line. When in the pumping mode, it reduces the high voltage of the grid to a voltage level suitable for the startup and operation of the generator motor, meets the working requirements of the motor, and makes the impedance between the power generation system and the grid match each other, improves the power transmission efficiency, reduces power reflection and loss, and ensures that electric energy can be effectively transmitted from the power generation side to the grid side.

[0011] Preferably, the switchgear in the electrical equipment can realize the on-off control of the circuit. During the startup, stop, and normal operation of the unit, by operating the switchgear, the connection or disconnection between the generator motor and the grid can be realized, ensuring that the unit is connected to or disconnected from the grid according to the operation requirements. And it can realize the on-off control of the circuit. During the startup, stop, and normal operation of the unit, by operating the switchgear, the connection or disconnection between the generator motor and the grid can be realized, ensuring that the unit is connected to or disconnected from the grid according to the operation requirements. And the busbar in the electrical equipment is used to collect and distribute electric energy, connecting electrical equipment such as generator motors, main transformers, and switchgear together, while the transmission line transports the electric energy of the substation to the grid to realize the long-distance transmission of electric energy.

[0012] Preferably, for different operating conditions of the pumped-storage unit, the control system determines the corresponding control mode, and in each control mode, based on a preset multi-objective optimization algorithm, it generates the optimal control parameters. Through the coordinated operation of the speed regulation system and the excitation system, it realizes multi-modal collaborative control, effectively improving the stability and response speed of the unit. For example, in the power generation mode, according to the frequency and voltage changes of the grid, it adjusts the guide vane opening of the governor and the excitation current of the excitation device in real time to make the power quality output by the unit meet the grid requirements; in the pumping mode, by precisely controlling the speed of the motor and the flow rate of the water pump, it realizes efficient pumping energy storage.

[0013] Preferably, the control system uses technologies such as big data and artificial intelligence to monitor and analyze the load changes of the power grid, the fluctuations of new energy power generation, and the operating status of the pumped-storage power station in real time, establish a prediction model, predict in advance the power demand of the power grid and possible faults, and based on the prediction results, adjust the operating conditions of the pumped-storage units in advance to achieve active support and stable control of the power grid. For example, by analyzing historical data and real-time data, predict the peak and trough periods of the power grid load in a future period of time, and arrange for the pumped-storage power station to carry out pumping energy storage and power generation operations in advance to avoid the instability of the power grid caused by the imbalance between power supply and demand. When electrical equipment fails such as short circuit, overload, overvoltage, undervoltage, or mechanical equipment has abnormal conditions such as too high bearing temperature, excessive vibration, and overspeed, the protection system can detect in time and take corresponding protection measures such as tripping and alarming to prevent equipment damage and ensure the safe operation of the unit and the power grid.

[0014] Preferably, in the auxiliary system, the oil system provides lubrication for the rotating parts such as the bearings and gears of the unit, reduces friction loss, and at the same time takes away the heat generated by friction, playing a cooling role. It also provides pressure oil for hydraulic equipment such as governors to ensure its normal operation. The technical water supply system provides cooling water for equipment such as the coolers and bearings of the unit to maintain the normal working temperature of the equipment; the fire water system provides a fire extinguishing water source in case of a fire to ensure the safety of equipment and personnel. The gas system provides compressed air for the maintenance seal of the unit to ensure the tightness during maintenance; provides air source for the braking device to achieve rapid braking of the unit; can also be used to adjust the water levels and pressures of the upper and lower reservoirs, and optimize the design of the technical water supply system and the unit bearing cooling system to improve the cooling efficiency and reliability. High-quality medium and high-pressure air compressors and air storage tanks and other equipment are selected, and the daily maintenance and management of the equipment are strengthened to ensure the stable operation of the compressed air system under high pressure and large flow requirements. At the same time, a standby air source and an automatic switching device are set.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: The stable power generation system based on the pumped-storage unit adopts a new structural design, and the specific content is as follows: (1) It can achieve the transition from a stationary state to full-load power generation or from a power generation state to a pumping state in a short time, quickly respond to the sharp changes in the power grid load, effectively adjust the supply-demand balance of the power system, and accurately adjust the power generation power by precisely controlling the guide vane opening of the water turbine and the excitation current of the generator motor, etc., so that it can be accurately matched with the load demand of the power grid, maintain the frequency of the power system stable within the specified range, and improve the power quality.

[0016] (2)As an important regulating power source in the power system, when other power sources fail or the power supply is insufficient, it can be quickly put into operation to supplement the power gap, avoid power outages in the system, enhance the reliability and stability of the power system, and can effectively suppress power oscillations and voltage fluctuations in the power system, improving the dynamic performance of the power system. For example, when a transient disturbance occurs in the system, the pumped-storage unit can quickly absorb or release energy, slow down the change rate of the system frequency and voltage, and help the system return to stability as soon as possible.

[0017] (3)During the pumping and power generation processes, although there are certain energy losses, generally speaking, the energy storage efficiency of the pumped-storage unit can reach about 70% - 80%. It can relatively effectively convert the excess electric energy during the low-load period of the power grid into the gravitational potential energy of water for storage, and release it back into the power grid when needed. At the same time, it converts electric energy into the potential energy of water for storage and then converts the potential energy of water back into electric energy. This form of energy conversion enables the pumped-storage unit to flexibly adapt to different operating requirements of the power system and plays an important role in the energy management of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic flow diagram of the stable power generation system of the present invention; Figure 2 It is a schematic diagram of the composition of the electromechanical equipment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0020] Please refer to Figure 1 and Figure 2, the present invention provides a technical solution: a stable power generation system based on a pumped-storage unit, including an upper reservoir, a lower reservoir, a water conveyance system, mechanical and electrical equipment, electrical equipment, a control system, and an auxiliary system. The upper reservoir is used to store water at a high altitude and provide water source for the water turbine during power generation. It is usually built at high terrains such as mountaintops or valleys. The lower reservoir is located at a lower position and is used to accommodate the water pumped up from the lower reservoir during the pumping operation, and receive the tail water discharged by the water turbine during the power generation operation. The water conveyance system is responsible for safely and efficiently guiding the water in the upper reservoir to the water turbine, and at the same time conveying the tail water of the water turbine to the lower reservoir, ensuring the smooth circulation of the water flow, reducing the head loss. The water conveyance system includes penstocks, tunnels, etc., which are used to connect the upper reservoir, the lower reservoir, and the water turbine. During the power generation operation, the water in the upper reservoir is safely, quickly, and efficiently guided to the water turbine, enabling the energy of the water flow to be maximally transferred to the water turbine, driving the water turbine to rotate, and providing power for power generation. Various protection devices are usually provided in the water conveyance system, such as safety valves, surge shafts, etc. The safety valve can automatically open when the water pressure is too high, releasing the excess pressure to prevent the pipes and equipment from being damaged due to overpressure. The surge shaft can quickly adjust the water level and pressure when the load changes, buffering the pressure fluctuations of the water flow, protecting the water turbine and other equipment from the impact of phenomena such as water hammer, and ensuring the safe operation of the unit. The mechanical and electrical equipment includes a water turbine, a motor-generator, a pump, a governor, and an excitation device. They work together to achieve the conversion between electrical energy and mechanical energy and the precise control of the power generation process. Among the mechanical and electrical equipment, the water turbine is a device that converts the energy of water into mechanical energy. In a pumped-storage power station, during power generation, the water in the upper reservoir flows through the water conveyance system to the water turbine, and the water flow impacts the runner of the water turbine, causing the runner to rotate, thereby converting the gravitational potential energy and kinetic energy of the water into the mechanical energy of the runner, providing rotational power for the motor-generator. The main function of the governor in the mechanical and electrical equipment is to adjust the guide vane opening of the water turbine. It automatically controls the opening and closing degree of the guide vanes according to the operating state of the unit and the load change of the power grid, and then precisely controls the water flow rate entering the water turbine. When the power grid load increases, the governor increases the guide vane opening, allowing more water flow to enter the water turbine, increasing the output of the water turbine to meet the power demand of the power grid. The electrical equipment includes a main transformer, switchgear, busbars, and transmission lines. During the power generation operation, the main transformer in the electrical equipment raises the relatively low voltage (usually dozens of kilovolts) generated by the motor-generator to a high voltage level suitable for power grid transmission, generally 110 kV and above. This can reduce the current during power transmission. According to Joule's law Q = I2Rt, it reduces the power loss on the transmission line. During the pumping operation, it reduces the high voltage of the power grid to a voltage level suitable for the start and operation of the motor-generator, meeting the working requirements of the motor, and making the impedance between the power generation system and the power grid match each other, improving the power transmission efficiency, reducing power reflection and loss, and ensuring that electrical energy can be effectively transmitted from the power generation side to the power grid side. The switchgear in the electrical equipment can achieve the on-off control of the circuit.During the startup, shutdown, and normal operation of the unit, by operating the switchgear, the connection or disconnection between the generator-motor and the power grid is achieved, ensuring that the unit is connected to or disconnected from the power grid according to the operating requirements. The busbar in the electrical equipment is used to collect and distribute electric energy, connecting electrical equipment such as the generator-motor, main transformer, and switchgear together. The transmission line transports the electric energy of the substation to the power grid, achieving long-distance transmission of electric energy and enabling the on-off control of the circuit. During the startup, shutdown, and normal operation of the unit, by operating the switchgear, the connection or disconnection between the generator-motor and the power grid is achieved, ensuring that the unit is connected to or disconnected from the power grid according to the operating requirements. The control system includes a monitoring system and a protection system. The control system determines the corresponding control mode for different operating conditions of the pumped-storage unit and generates the optimal control parameters based on a preset multi-objective optimization algorithm under each control mode. Through the coordinated operation of the speed regulation system and the excitation system, multi-modal collaborative control is achieved, effectively improving the stability and response speed of the unit. For example, under the power generation condition, according to the frequency and voltage changes of the power grid, the guide vane opening of the governor and the excitation current of the excitation device are adjusted in real time to make the power quality output by the unit meet the requirements of the power grid; under the pumping condition, by precisely controlling the speed of the motor and the flow rate of the water pump, efficient pumping energy storage is achieved. The control system uses technologies such as big data and artificial intelligence to monitor and analyze the load changes of the power grid, the fluctuations of new energy power generation, and the operating status of the pumped-storage power station in real time, establishes a prediction model, and predicts in advance the power demand of the power grid and possible faults. Based on the prediction results, the operating conditions of the pumped-storage unit are adjusted in advance to achieve active support and stable control of the power grid. For example, by analyzing historical data and real-time data, the peak and trough periods of the power grid load in the future are predicted, and the pumped-storage power station is arranged in advance for pumping energy storage and power generation operations to avoid power grid instability caused by power supply-demand imbalance. When electrical equipment fails such as short circuit, overload, overvoltage, undervoltage, or mechanical equipment has abnormal conditions such as too high bearing temperature, excessive vibration, or overspeed, the protection system can detect and take corresponding protection measures in time, such as tripping and alarming, to prevent equipment damage and ensure the safe operation of the unit and the power grid. The auxiliary system includes an oil system, a water system, and a gas system. In the auxiliary system, the oil system provides lubrication for the rotating parts such as the bearings and gears of the unit, reduces friction loss, and at the same time takes away the heat generated by friction, playing a cooling role. It also provides pressure oil for hydraulic equipment such as the governor to ensure its normal operation. The technical water supply system provides cooling water for equipment such as the cooler and bearings of the unit to maintain the normal working temperature of the equipment; the fire protection water system provides a fire extinguishing water source in case of a fire to ensure the safety of equipment and personnel. The gas system provides compressed air for the maintenance seal of the unit to ensure the sealing performance during maintenance; provides air source for the braking device to achieve rapid braking of the unit; can also be used to adjust the water level and pressure of the upper and lower reservoirs, and optimize the design of the technical water supply system and the unit bearing cooling system.Improve the cooling efficiency and reliability, select high-quality medium and high-pressure air compressors and gas storage tanks and other equipment, and strengthen the daily maintenance and management of the equipment to ensure the stable operation of the compressed air system under high pressure and large flow requirements. At the same time, set up a standby gas source and an automatic switching device.

[0021] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A stable power generation system based on a pumped storage unit, characterized in that: It includes an upper reservoir, a lower reservoir, a water delivery system, electromechanical equipment, electrical equipment, a control system and an auxiliary system. The upper reservoir is used to store water at a high place and provide water for the turbine during power generation. It is usually built on high terrain such as a mountain top or a valley. The lower reservoir is located at a lower position and is used to accommodate water pumped up from the lower reservoir during pumping conditions and to receive tail water discharged from the turbine during power generation conditions. The water delivery system is responsible for safely and efficiently directing water from the upper reservoir to the turbine, and at the same time transporting the tail water of the turbine to the lower reservoir to ensure smooth circulation of water flow and reduce head loss. The electromechanical equipment includes a turbine, a generator motor, a water pump, a speed regulator and an excitation device, which work together to achieve the conversion between electrical energy and mechanical energy and the precise control of the power generation process. The electrical equipment includes a main transformer, a switchgear, a busbar and a transmission line. The control system includes a monitoring system and a protection system. The auxiliary system includes an oil system, a water system and a gas system.

2. A stable power generation system based on a pumped storage unit according to claim 1, characterized in that: The water delivery system includes pressure pipes, tunnels, etc., which are used to connect the upper reservoir, the lower reservoir and the turbine. When generating electricity, the water in the upper reservoir is safely, quickly and efficiently led to the turbine, so that the energy of the water flow can be transferred to the turbine to the maximum extent, driving the turbine to rotate and providing power for power generation.

3. A stable power generation system based on a pumped storage unit according to claim 1, characterized in that: The water delivery system is usually equipped with various protective devices, such as safety valves and pressure regulating wells. The safety valve can automatically open when the water pressure is too high to release excess pressure and prevent pipelines and equipment from being damaged due to overpressure; the pressure regulating well can quickly adjust the water level and pressure when the load changes, buffer the pressure fluctuations of the water flow, protect the turbine and other equipment from the impact of water hammer and other phenomena, and ensure the safe operation of the unit.

4. A stable power generation system based on a pumped storage unit according to claim 1, characterized in that: The water turbine in the electromechanical equipment is a device that converts water energy into mechanical energy. In a pumped storage power station, when generating electricity, water from the upper reservoir flows to the water turbine through the water delivery system. The water flow impacts the runner of the water turbine, causing the runner to rotate, thereby converting the gravitational potential energy and kinetic energy of the water into mechanical energy of the runner, providing rotational power for the generator motor.

5. A stable power generation system based on a pumped storage unit according to claim 1, characterized in that: The main function of the speed governor in the electromechanical equipment is to adjust the guide vane opening of the turbine. It automatically controls the opening and closing degree of the guide vanes according to the operating status of the unit and the load changes of the power grid, and then accurately controls the water flow entering the turbine. When the load of the power grid increases, the speed governor increases the guide vane opening to allow more water to enter the turbine, increasing the output of the turbine to meet the power demand of the power grid.

6. A stable power generation system based on a pumped storage unit according to claim 1, characterized in that: When the main transformer in the electrical equipment is in power generation mode, it increases the lower voltage (usually tens of kilovolts) emitted by the generator motor to a high voltage level suitable for power grid transmission, generally 110 kilovolts and above. This can reduce the current in the transmission process and reduce the loss of electric energy in the transmission line according to Joule's law Q=I2Rt. When the main transformer is in pumping mode, it reduces the high voltage of the power grid to a voltage level suitable for the start-up and operation of the generator motor to meet the working requirements of the motor, and makes the impedance between the power generation system and the power grid match each other, thereby improving the power transmission efficiency, reducing power reflection and loss, and ensuring that electric energy can be effectively transmitted from the power generation side to the power grid side.

7. A stable power generation system based on a pumped storage unit according to claim 1, characterized in that: The switch device in the electrical equipment can realize the on-off control of the circuit. During the start-up, stop and normal operation of the unit, the generator motor is connected or disconnected from the power grid by operating the switch device, ensuring that the unit is connected to or exited from the power grid according to the operation requirements. The circuit can be controlled on and off. During the start-up, stop and normal operation of the unit, the generator motor is connected or disconnected from the power grid by operating the switch device, ensuring that the unit is connected to or exited from the power grid according to the operation requirements. The busbar in the electrical equipment is used to collect and distribute electric energy, connecting electrical equipment such as the generator motor, main transformer, and switch device together, and the transmission line transmits the electric energy from the substation to the power grid to realize the long-distance transmission of electric energy.

8. A stable power generation system based on a pumped storage unit according to claim 1, characterized in that: The control system determines the corresponding control mode according to different operating conditions of the pumped storage unit, and generates optimal control parameters under each control mode based on a preset multi-objective optimization algorithm, and realizes multi-modal collaborative control by coordinating the speed control system and the excitation system, thereby effectively improving the stability and response speed of the unit. For example, under power generation conditions, the guide vane opening of the speed regulator and the excitation current of the excitation device are adjusted in real time according to the frequency and voltage changes of the power grid, so that the power quality output by the unit meets the requirements of the power grid; under pumping conditions, efficient pumping energy storage is realized by accurately controlling the speed of the motor and the flow rate of the water pump.

9. A stable power generation system based on a pumped storage unit according to claim 1, characterized in that: The control system uses technologies such as big data and artificial intelligence to monitor and analyze the load changes of the power grid, the fluctuations of new energy power generation, and the operating status of the pumped-storage power station in real time, establish a prediction model, predict the power demand of the power grid and possible faults in advance, and adjust the operating conditions of the pumped-storage unit in advance based on the prediction results to achieve active support and stable control of the power grid. For example, by analyzing historical data and real-time data, the peak and trough periods of the power grid load in the future are predicted, and the pumped-storage power station is arranged in advance to perform pumped storage and power generation operations to avoid power grid instability caused by an imbalance in power supply and demand. When electrical equipment has faults such as short circuit, overload, overvoltage, undervoltage, or mechanical equipment has abnormal conditions such as excessive bearing temperature, excessive vibration, and overspeed, the protection system can detect in time and take corresponding protection measures, such as tripping, alarming, etc., to prevent equipment damage and ensure the safe operation of the unit and the power grid.

10. A stable power generation system based on a pumped storage unit according to claim 1, characterized in that: The oil system in the auxiliary system provides lubrication for the bearings, gears and other rotating parts of the unit to reduce friction loss, and at the same time takes away the heat generated by friction to play a cooling role. It also provides pressurized oil for hydraulic equipment such as the speed governor to ensure its normal operation. The technical water supply system provides cooling water for the unit's coolers, bearings and other equipment to maintain the normal operating temperature of the equipment; the fire water system provides a fire extinguishing water source in the event of a fire to ensure the safety of equipment and personnel. The air system provides compressed air for the maintenance seal of the unit to ensure the sealing during maintenance; it provides an air source for the braking device to achieve rapid braking of the unit; it can also be used to adjust the water level and pressure of the upper and lower reservoirs, and optimize the design of the technical water supply system and the unit bearing cooling system to improve cooling efficiency and reliability, and select high-quality medium and high pressure air compressors and gas storage tanks and other equipment, and strengthen the daily maintenance and management of the equipment to ensure that the compressed air system can operate stably under high pressure and large flow requirements. At the same time, a backup air source and an automatic switching device are set.

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