Protection control device for compression control of expansion power generation system of energy storage power station

Abstract

The invention provides a protection control device for an expansion power generation system of a compression control energy storage power station. The protection control device comprises a control module, a plurality of measuring points arranged on the compression control energy storage power station and valves, the control module is in communication connection with each measuring point and the valve; the control module is used for acquiring measurement data of each measurement point, monitoring feedback signals of a plurality of devices in the compression control energy storage power station, applying a preset protection control strategy and controlling a valve according to the measurement data of each measurement point and the feedback signals of each device, and completing protection control of an expansion power generation system in the compression control energy storage power station. The equipment comprises an electrical protection device, an electrical cabinet, a circulating cooling water system, an expansion generator, a heat release system, a cold storage system, measuring points and valves. The reliability and efficiency of protection control of the expansion power generation system can be improved, the safety and reliability of the compressed air energy storage power station are improved, and the supporting capacity for a power grid is guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of compressed air energy storage power generation, and particularly to a protection control device for an expansion power generation system of a compressed control energy storage power station. Background Art

[0002] A compressed air energy storage power station is decomposed into five subsystems: air compression, air liquefaction, heat storage / heat release, cold storage / cold release, and expansion power generation. During the energy release stage, the expansion power generation system, the cold storage system, and the heat release system operate in coordination. The expansion power generation system is mainly composed of a multi-stage inter-stage reheated air expansion generator set. This subsystem is a core component of the compressed air energy storage power station. During the energy release stage, the high-pressure air at the outlet of the evaporator is heated by the reheaters at all levels and then drives the air expanders at all levels to do work externally, realizing the release of energy.

[0003] Currently, protection control is usually carried out on traditional coal-fired or combined cycle power stations, relying on a large number of manual operations. However, in terms of operation mode, a compressed air energy storage power station is different from traditional coal-fired or combined cycle power stations. Its entire operation process is divided into two independent links: energy release during the day and energy storage at night. Due to the cyclic storage and release of energy and working medium, the two links also have a strong thermodynamic coupling relationship; in terms of operation parameters, to meet the requirements of high cold and heat energy comprehensive utilization, the internal heat transfer process is complex, the external operating conditions are variable, and for each single device and subsystem to meet the requirements of high efficiency and stability under special operating conditions, there are extremely high requirements for equipment selection and operation parameters. Therefore, the protection control method for traditional coal-fired or combined cycle power stations is not applicable to the expansion power generation system of a compressed air energy storage power station, affecting the reliability and efficiency of the protection control of the expansion power generation system. If the expansion power generation system cannot be started or stopped in time, it will affect the normal operation of the unit. Summary of the Invention

[0004] In view of at least one problem in the prior art, the present application proposes a protection control device for an expansion power generation system of a compressed control energy storage power station, which can improve the reliability and efficiency of the protection control of the expansion power generation system, and further improve the safety and reliability of the compressed air energy storage power station, and ensure the supporting ability for the power grid.

[0005] To solve the above technical problems, the present application provides the following technical solutions:

[0006] In a first aspect, the present application provides a protection control device for an expansion power generation system of a compressed control energy storage power station, including:

[0007] A control module, and a plurality of measuring points and valves arranged on the compressed control energy storage power station; the control module is communicatively connected to each of the measuring points and valves respectively;

[0008] The control module is used to obtain the measurement data of each measurement point, monitor the feedback signals of multiple devices in the compression control energy storage power station, and apply a preset protection control strategy according to the measurement data of each measurement point and the feedback signals of each device to control the valve, so as to complete the protection control of the expansion power generation system in the compression control energy storage power station. The devices include: electrical protection devices, electrical cabinets, circulating cooling water systems, expansion generators, heat release systems, cold storage systems, each measurement point, and valves.

[0009] In one embodiment, the multiple measurement points provided on the compression control energy storage power station include:

[0010] Differential pressure measurement points respectively provided at the air expansion machine shaft seal self-sealing main pipe, oil filter, and inlet filters of each stage of the air expansion machine, an air pressure measurement point provided at the outlet of the evaporator in the cold storage system, pressure measurement points respectively provided in front of the emergency cut-off valve at the inlet of the first-stage air expansion machine, behind the inlet regulating valve of the first-stage air expansion machine, the circulating cooling water system water supply main pipe, the outlets of each stage of the air expansion machine, and at the inlets of the second to fourth-stage air expansion machines, an oil supply pressure measurement point provided at the lubricating oil main pipe, a supply air pressure measurement point provided at the air expansion machine shaft seal self-sealing main pipe,

[0011] An air temperature measurement point provided at the outlet of the evaporator in the cold storage system, temperature measurement points respectively provided at the generator coil, generator support bearings, inlets of each stage of the air expansion machine, outlets of each stage of the air expansion machine, high-speed shaft support bearings of the speed reducer, main shaft support bearings after speed reduction of the speed reducer, low-speed shaft support bearings of the speed reducer, support bearings of each stage of the air expansion machine, high-speed shaft thrust bearings, and low-speed shaft thrust bearings, a supply air temperature measurement point provided at the air expansion machine shaft seal self-sealing, a lubricating oil temperature measurement point provided at the outlet of the oil cooler, an oil temperature measurement point provided at the lubricating oil tank, and a return oil temperature measurement point provided at the lubricating oil.

[0012] X / Y axial vibration measurement points respectively provided at the high-speed shaft support bearings and low-speed shaft support bearings of the speed reducer, vibration measurement points respectively provided at the support bearings of each stage of the air expansion machine, an isolation air flow measurement point provided at the air supply for the air expansion machine shaft seal in the instrument / plant compressed air system, a lubricating oil return oil flow measurement point provided at the lubricating oil tank, a flow measurement point provided at the circulating cooling water return main pipe, a liquid level measurement point provided at the lubricating oil tank, shaft displacement measurement points respectively provided at the high-speed shaft and low-speed shaft, speed measurement points respectively provided at the high-speed shaft and low-speed shaft, and a speed measurement point provided at the generator.

[0013] In one embodiment, the valve includes:

[0014] An emergency cut-off valve arranged at the inlet of the first-stage air expander; a first regulating valve arranged at the inlet of the first-stage air expander; a second regulating valve arranged at the exhaust of the fourth-stage air expander leading to the air compression system; a supply air pressure regulating valve arranged at the self-sealing main pipe of the air expander shaft seal; a self-sealing supply air pressure regulating valve respectively arranged at each stage of the air expander; an isolation air flow regulating valve arranged at the supply of the instrument / plant compressed air system to the air expander shaft seal; a third regulating valve arranged at the bypass of the expansion generator; a lubricating oil temperature regulating valve arranged at the outlet of the oil cooler; a lubricating oil pressure regulating valve arranged at the outlet of the oil filter.

[0015] In one embodiment, the control module is configured to obtain first measurement data, monitor the feedback signals of the first equipment in the compressed control energy storage power station, and control the emergency cut-off valve arranged at the inlet of the first-stage air expander, the first regulating valve arranged at the inlet of the first-stage air expander, the second regulating valve arranged at the exhaust of the fourth-stage air expander leading to the air compression system, and the third regulating valve arranged at the bypass of the expansion generator according to the first measurement data, the feedback signals of the first equipment, and the control protection strategy of the expansion generator, so as to complete the control protection of the expansion generator of the expansion power generation system.

[0016] Wherein, the first measurement data includes: differential pressure measurement points respectively arranged at the self-sealing main pipe of the air expander shaft seal, the oil filter, and the inlet filter screens of each stage of the air expander; pressure measurement points respectively arranged in front of the emergency cut-off valve at the inlet of the first-stage air expander and at the supply main pipe of the circulating cooling water system; a supply air pressure measurement point arranged at the self-sealing main pipe of the air expander shaft seal; a supply oil pressure measurement point arranged at the lubricating oil main pipe; temperature measurement points respectively arranged at the generator coil, the generator support bearing, the reduction gearbox support bearing, the support bearings of each stage of the air expander, the high-speed shaft thrust bearing, and the low-speed shaft thrust bearing; an oil temperature measurement point arranged at the lubricating oil tank; X / Y axial vibration measurement points respectively arranged at the high-speed shaft support bearing and the low-speed shaft support bearing of the reduction gearbox; vibration measurement points respectively arranged at the support bearings of each stage of the air expander; an isolation air flow measurement point arranged at the supply of the instrument / plant compressed air system to the air expander shaft seal; a flow measurement point arranged at the return main pipe of the circulating cooling water; a liquid level measurement point arranged at the lubricating oil tank; shaft displacement measurement points respectively arranged at the high-speed shaft and the low-speed shaft; rotational speed measurement points respectively arranged at the high-speed shaft and the low-speed shaft; and rotational speed measurement points arranged at the generator. The first equipment includes: an electrical protection device, an electrical cabinet, a circulating cooling water system, each of the measurement points and valves.

[0017] In one embodiment, the control module is configured to obtain second measurement data, and control a lubricating oil temperature regulating valve disposed at the outlet of the oil cooler and a lubricating oil pressure regulating valve disposed at the outlet of the oil filter according to the second measurement data and the lubricating oil auxiliary system control protection strategy, so as to complete the control protection of the lubricating oil auxiliary system of the expansion power generation system; wherein, the second measurement data includes measurement data collected by an oil temperature measuring point disposed at the lubricating oil tank, a liquid level measuring point disposed at the lubricating oil tank, a supply air pressure measuring point disposed at the shaft seal self-sealing main pipe of the air expander, a supply oil pressure measuring point disposed at the lubricating oil main pipe, a rotational speed measuring point disposed at the generator, and a lubricating oil temperature measuring point disposed at the outlet of the oil cooler.

[0018] In one embodiment, the control module is configured to obtain third measurement data, and control a supply air pressure regulating valve disposed at the shaft seal self-sealing main pipe of the air expander, a self-sealing supply air pressure regulating valve disposed at each stage of the air expander, an isolation gas flow regulating valve disposed at the supply of the instrument / plant compressed air system to the shaft seal of the air expander, and a third regulating valve disposed at the bypass of the expansion generator according to the third measurement data and the air expander bypass control protection strategy, so as to complete the control protection of the seal gas, isolation gas and bypass of the air expander of the expansion power generation system;

[0019] wherein, the third measurement data includes measurement data collected by a supply air pressure measuring point disposed at the shaft seal self-sealing main pipe of the air expander, pressure measuring points disposed after the inlet regulating valve of the first-stage air expander and at the inlets of the second to fourth-stage air expanders, an isolation gas flow measuring point disposed at the supply of the instrument / plant compressed air system to the shaft seal of the air expander, and an air temperature measuring point disposed at the outlet of the evaporator in the cold storage system.

[0020] In one embodiment, controlling an emergency cut-off valve disposed at the inlet of the first-stage air expander, a first regulating valve disposed at the inlet of the first-stage air expander, a second regulating valve disposed at the exhaust of the fourth-stage air expander to the air compression system, and a third regulating valve disposed at the bypass of the expansion generator according to the first measurement data, the feedback signal of the first device and the expansion generator control protection strategy, so as to complete the control protection of the expansion generator of the expansion power generation system, includes:

[0021] Based on the first measurement data and the feedback signal of the first device, if the expansion generator meets each condition in the first condition group, then trigger the expansion generator to be allowed to be put into operation with the brake released; if the expansion generator meets at least one condition in the second condition group, then trigger an alarm; if the expansion generator meets each condition in the third condition group, then trigger an alarm and interlock for shutdown;

[0022] When at least one of the conditions of triggering the expansion generator to allow turning on the brake and starting, triggering an alarm, and triggering alarm interlock shutdown occurs, an alarm interlock shutdown signal is sent to the expansion generator, and the emergency cut-off valve, the first regulating valve, and the second regulating valve are interlocked and closed, the third regulating valve is interlocked and opened, and the AC lubricating oil pump is interlocked and started. At the same time, the circuit breaker at the outlet of the expansion generator is tripped and the expansion generator remains in the shutdown state.

[0023] In one embodiment, according to the second measurement data and the control protection strategy of the lubricating oil auxiliary system, controlling the lubricating oil temperature regulating valve arranged at the outlet of the oil cooler and the lubricating oil pressure regulating valve arranged at the outlet of the oil filter to complete the control protection of the lubricating oil auxiliary system of the expansion power generation system, including:

[0024] Based on the second measurement data, if the electric heater is manually shut down or the oil temperature in the lubricating oil tank is greater than or equal to the preset high temperature value, the electric heater in the lubricating oil tank is interlocked and shut down;

[0025] If the lubricating oil auxiliary system meets at least one condition in the fourth condition group, the electric heater in the lubricating oil tank is interlocked and started. The fourth condition group includes: the condition of manually starting the electric heater, the condition that the lubricating oil tank liquid level ≥ the preset high liquid level value and the lubricating oil tank oil temperature ≤ the first preset low temperature value;

[0026] If the air expander shaft seal self-sealing main pipe supply pressure ≥ the second preset low pressure value and the lubricating oil tank oil temperature ≥ the second preset low temperature value, the AC lubricating oil pump is started;

[0027] If the lubricating oil auxiliary system meets at least one condition in the fifth condition group, the AC lubricating oil pump is interlocked and shut down. The conditions in the fifth condition group include: the condition of manually shutting down the AC lubricating oil pump; the condition that at least two of the lubricating oil main pipe supply pressures at multiple measuring points are ≥ the preset high pressure value; the condition that the air expander shaft seal self-sealing main pipe supply pressure ≤ the third preset low pressure value, and at the same time the expansion generator shutdown feedback signal has been triggered and the operation feedback signal has not been triggered;

[0028] If the lubricating oil auxiliary system meets at least one condition in the sixth condition group, the AC lubricating oil pump is interlocked and started. The conditions in the sixth condition group include: the condition of manually starting the AC lubricating oil pump; the condition of the expansion generator triggering alarm interlock shutdown; the condition that at least two of the lubricating oil main pipe supply pressures at multiple measuring points are ≤ the first fourth preset low pressure value; the condition that at least two of the generator speeds at multiple measuring points are ≤ the preset low speed value;

[0029] Control the lubricating oil temperature regulating valve to be put into the automatic control of the lubricating oil temperature at the outlet of the oil cooler;

[0030] Control the lubricating oil pressure regulating valve to be put into the automatic control of the lubricating oil main pipe supply pressure.

[0031] In one embodiment, according to the third measurement data and the air expander bypass control protection strategy, control the supply air pressure regulating valve arranged at the self-sealing main pipe of the air expander shaft seal, the self-sealing supply air pressure regulating valve arranged at each stage of the air expander, the isolation gas flow regulating valve arranged at the instrument / plant compressed air system for supplying the air expander shaft seal, and the third regulating valve arranged at the bypass of the expansion generator, to complete the control protection of the air expander seal gas, isolation gas and bypass of the expansion power generation system, including:

[0032] Control the supply air pressure regulating valve to input the pressure automatic control of the supply air pressure of the air expander shaft seal self-sealing main pipe; according to the real-time value of the pressure after the inlet regulating valve of each stage of the air expander minus the offset, control the self-sealing supply air pressure regulating valve at this stage of the air expander to input the pressure automatic control; control the isolation gas flow regulating valve to input the flow automatic control of the isolation gas flow of the instrument / plant compressed air system for supplying the air expander shaft seal; control the third regulating valve to input the pressure automatic control of the air pressure at the outlet of the evaporator in the cold storage system.

[0033] In one embodiment, the control module is used for:

[0034] Judge whether the liquid level height of the low-temperature liquid storage tank in the cold storage system is less than or equal to the preset low liquid level value. If so, interlock to stop the operation of the expansion generator, interlock to stop the operation of the cryogenic pump and the circulation fan in the cold storage system, interlock to close the isolation valve of the high-temperature heat storage medium pump in the heat release system leading to the inter-stage reheater and interlock to open the recirculation regulating valve. After a preset time, interlock to stop the operation of the high-temperature heat storage medium pump;

[0035] Monitor the shutdown feedback signal and the operation feedback signal of the expansion generator. If the shutdown feedback signal of the expansion generator has been triggered and the operation feedback signal has not been triggered, interlock to stop the operation of the cryogenic pump and the circulation fan in the cold storage system, interlock to close the isolation valve of the high-temperature heat storage medium pump in the heat release system leading to the inter-stage reheater and interlock to open the recirculation regulating valve. After a preset time, interlock to stop the operation of the high-temperature heat storage medium pump;

[0036] Monitor the shutdown feedback signal and the operation feedback signal of all high-temperature heat storage medium pumps in the heat release system. If the shutdown feedback signals of all high-temperature heat storage medium pumps in the heat release system have been triggered and the operation feedback signals have not been triggered, after a preset time, interlock to stop the operation of the expansion generator, the cryogenic pump and the circulation fan in the cold storage system;

[0037] Monitor the shutdown feedback signals and operation feedback signals of all cryogenic pumps in the chilled water storage system. If all the shutdown feedback signals of the cryogenic pumps in the chilled water storage system have been triggered and the operation feedback signals have not been triggered, then after a preset time, interlock to stop the operation of the expansion generator and the circulating fans in the chilled water storage system, interlock to close the isolation valves of the high-temperature heat storage medium pumps in the heat release system leading to the inter-stage reheaters, interlock to open the recirculation regulating valve, and after a preset time, interlock to stop the operation of the high-temperature heat storage medium pumps;

[0038] Monitor the shutdown feedback signals and operation feedback signals of all circulating fans in the chilled water storage system. If all the shutdown feedback signals of the circulating fans in the chilled water storage system have been triggered and the operation feedback signals have not been triggered, then after a preset time, interlock to stop the operation of the expansion generator and the cryogenic pumps in the chilled water storage system, interlock to close the isolation valves of the high-temperature heat storage medium pumps in the heat release system leading to the inter-stage reheaters, interlock to open the recirculation regulating valve, and after a preset time, interlock to stop the operation of the high-temperature heat storage medium pumps;

[0039] Monitor the shutdown feedback signals and operation feedback signals of all circulating cooling water pumps in the circulating cooling water system. If all the shutdown feedback signals of the circulating cooling water pumps in the circulating cooling water system have been triggered and the operation feedback signals have not been triggered, then after a preset time, interlock to stop the operation of the expansion generator, the cryogenic pumps and the circulating fans in the chilled water storage system, and the high-temperature heat storage medium pumps in the heat release system.

[0040] As can be seen from the above technical solutions, the present application provides a protection control device for a compression control energy storage power station expansion power generation system, including: a control module, a plurality of measuring points and valves provided on the compression control energy storage power station; the control module is respectively communicatively connected to each of the measuring points and valves; the control module is configured to obtain the measurement data of each of the measuring points, monitor the feedback signals of a plurality of devices in the compression control energy storage power station, and apply a preset protection control strategy according to the measurement data of each measuring point and the feedback signals of each of the devices to control the valves, so as to complete the protection control of the expansion power generation system in the compression control energy storage power station. The devices include: an electrical protection device, an electrical cabinet, a circulating cooling water system, an expansion generator, a heat release system, a cold storage system, each of the measuring points and valves, which can improve the reliability and efficiency of the protection control of the expansion power generation system, thereby improving the safety and reliability of the compressed air energy storage power station, ensuring the support capacity for the power grid, and also saving labor costs; optimizing the control logics such as start-up permission and protection tripping of each main device, specifically designing the control logics such as interlocking start-stop (switch) of the supporting lubricating oil auxiliary oil pump and related control valves, and reasonably expanding the protection control logics between each device; effectively ensuring the safe and efficient operation of the expansion power generation system of the compressed air energy storage power station from start-up, grid connection to full load, improving the automation degree of equipment operation while ensuring the safe operation of the unit, reducing the workload of operating personnel, preventing mistakes that may be caused by manual judgment of equipment failures, and ensuring the safe and stable operation of the unit to the greatest extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0042] Figure 1 It is a flowchart of a compressed air energy storage power station in the prior art;

[0043] Figure 2 It is a schematic structural diagram of the protection control device for the expansion power generation system of the compression control energy storage power station in the embodiment of the present application.

[0044] Figure 3 It is a schematic diagram of the expansion power generation system in the embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0045] To enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of this application.

[0046] Renewable energy represented by wind energy and solar energy, due to the influence of natural environmental factors, cannot achieve precise control of energy input during the power generation process like fossil energy. It has characteristics such as large load and frequency fluctuations and high instability, resulting in large-scale curtailment of wind power and photovoltaic power. Therefore, large-scale energy storage technologies applied to the renewable energy power generation industry have emerged as the times require. Among them, compressed air energy storage technology has characteristics such as a long operating life, a large energy storage capacity, and strong environmental friendliness compared to other types of energy storage systems, and has been increasingly widely used in high-new energy technology fields such as large-scale power energy distribution and renewable energy applications.

[0047] As Figure 1 shown, the entire compressed air energy storage power station can be decomposed into five subsystems: air compression, air liquefaction, heat storage / heat release, cold storage / cold release, and expansion power generation according to functions. Its working process is divided into two links that do not occur simultaneously: the energy storage stage and the energy release stage. Among them, during the energy storage stage, the air compression system, air liquefaction system, heat storage system, and cold release system operate in coordination; during the energy release stage, the expansion power generation system, cold storage system, and heat release system operate in coordination.

[0048] The main single equipment of the air compression system includes an air filter, an air compressor unit, an air purifier, and a circulating booster unit, etc. Its main function is to use the excess electric energy through the air compressor unit and the circulating booster unit to compress the upstream filtered and purified air to meet the downstream air liquefaction requirements.

[0049] The main single equipment of the air liquefaction system includes a booster expansion refrigeration unit (including the booster and expansion ends), a main heat exchanger, a gas-liquid separator, an air cooler, and a liquid expander or throttle valve, etc. Its main function is to gradually cool the upstream purified high-pressure normal-temperature dry air to a low temperature to obtain liquefied air that meets the process conditions.

[0050] The main single equipment of the heat storage / heat release system includes inter-stage and final-stage coolers, inter-stage reheaters, high / low-temperature heat storage medium tanks, high / low-temperature heat storage medium pumps, circulating pumps, and closed cooling towers, etc. Its main function is to send the low-temperature heat storage medium to the inter-stage and final-stage coolers to store the compressed thermal energy during the energy storage stage, and send the high-temperature heat storage medium to the inter-stage reheaters to release the stored thermal energy during the energy release stage, realizing the recycling of thermal energy.

[0051] The main individual equipment of the cold storage / cold release system includes low-temperature liquid storage tanks, cryogenic pumps, evaporators, packed bed cold storage tank groups, circulating fans, etc. Its main function is to store the cold energy released by the phase change of liquefied air in the evaporator during the cold release stage, and input the cold energy into the liquefaction subsystem during the energy storage stage, realizing the recycling of cold energy.

[0052] As Figure 1 shown, during the cold release stage, liquid air flows out of the low-temperature liquid storage tank of the cold storage system and is pressurized by a cryogenic pump, and vaporizes in the evaporator to release cold energy. In the expansion power generation system, the high-pressure air close to normal temperature after vaporization enters the expansion unit for four-stage expansion power generation. To increase the power generation of air per unit mass, inter-stage reheaters are set at the inlets of each stage of the expansion turbine to increase the air temperature at the inlet of the expansion turbine. Driven by the high-temperature air, the four-stage expansion unit drives the generator to do work and generate electricity, which is then sent to the power grid, completing the conversion of air potential energy and electrical energy.

[0053] In the heat release system, the heat storage medium in the high-temperature heat storage medium tank enters the high-temperature heat storage medium pump for pressurization, and then is sent to 4 inter-stage reheaters to heat the expanded air, realizing the utilization of compressed thermal energy. Since the compressed thermal energy stored in the system design is greater than the thermal energy required to heat the expanded air, and considering that heat energy surplus will also occur during the start-stop or variable operating conditions of the system, it will cause the temperature of the heat storage medium flowing together in front of the closed cooling tower to be too high to achieve the designed temperature drop of the tower. Therefore, the heat storage medium at 20°C in the low-temperature heat storage medium tank is first pressurized by a circulating pump to the inlet of the closed cooling tower to mix and cool the flowing-together heat storage medium. After the two are mixed, they are cooled to 20°C by the closed cooling tower and finally returned to the low-temperature heat storage medium tank.

[0054] In the cold storage system, the cold energy released by the phase change in the evaporator is stored in the packed bed cold storage tank through circulating air. The circulating air is pressurized by a circulating fan and sent into the evaporator to be cooled. The obtained low-temperature air is sent into the cold storage tank, thereby transferring the cold energy to the cold storage tank to realize the recovery and storage of cold energy. The low-temperature air is heated to near normal temperature by the cold storage material in the tank and then returns to the inlet of the circulating fan to complete one cycle.

[0055] At the present stage, the development route of compressed air energy storage technology is still in the experimental platform stage, only used for technical verification, not for large-scale industrial production, nor has a standardized and unified engineering application model for reference been formed. The cryogenic liquefied air energy storage power generation system is a relatively complex energy utilization and conversion system, covering various types of equipment such as low temperature, high temperature, high pressure, and high speed. In order to improve the system energy efficiency and meet the storage and utilization of cold and heat energy, the operating modes and parameters of the cryogenic liquefied air energy storage power generation system and each key single equipment also have great particularities. In terms of the operating mode, different from traditional coal-fired or combined cycle power plants, its entire operating process is divided into two independent links: energy release during the day and energy storage at night. However, due to the cyclic storage and release of energy and working medium, the two links also have a strong thermodynamic coupling relationship; in terms of operating parameters, to meet the requirements of higher comprehensive utilization of cold and heat energy, the internal heat transfer process is complex, and the external operating conditions are variable. In order to meet the requirements of high efficiency and stability under special operating conditions, there are extremely high requirements for equipment selection and operating parameters for each single equipment and subsystem. Therefore, for a complex energy storage system involving thermodynamic processes in fields such as refrigeration, liquefaction, cold storage, heat storage, and power generation, corresponding safety protection control strategies need to be formulated according to its special operating mode and complex and variable operating conditions.

[0056] In view of this, the embodiment of the present application proposes a protection control device for the expansion power generation system of a compressed control energy storage power station, which can classify and consider the numerous and complicated measuring points and valves of the system, design them separately, fully balance the risks of "false operation" and "refusal to operate" of equipment protection, optimize the design of control logics such as start permission and protection tripping of the main equipment, specifically design the control logics of interlocking start and stop (switch) of the supporting lubricating oil auxiliary oil pump and related control valves, and reasonably expand the protection control logics between each equipment.

[0057] Specifically, it is described through the following various embodiments.

[0058] Embodiment 1

[0059] In order to improve the reliability and efficiency of the protection control of the expansion power generation system, and further improve the safety and reliability of the compressed air energy storage power station, and ensure the supporting ability for the power grid, as Figure 2 shown, this embodiment provides a protection control device for the expansion power generation system of a compressed control energy storage power station, including:

[0060] A control module 10, a plurality of measuring points 20 and valves 30 arranged on a compressed control energy storage power station; the control module is communicatively connected to each of the measuring points and valves; the control module is configured to obtain measurement data of each of the measuring points, monitor feedback signals of a plurality of devices in the compressed control energy storage power station, and apply a preset protection control strategy according to the measurement data of each measuring point and the feedback signals of each of the devices to control the valves, so as to complete the protection control of the expansion power generation system in the compressed control energy storage power station, and the devices include: an electrical protection device, an electrical cabinet, a circulating cooling water system, an expansion generator, a heat release system, a cold storage system, each of the measuring points and valves.

[0061] Specifically, the control module may be a controller or a server, etc. The preset protection control strategy may include at least one of: an expansion generator control protection strategy, a lubricating oil auxiliary system control protection strategy, an air expander bypass control protection strategy, and a large interlock shutdown condition. The measurement data of each of the measuring points may include:

[0062] Differential pressure of the inlet filter of the 1st-stage air expander (CPD1); Differential pressure of the inlet filter of the 2nd-stage air expander (CPD2); Differential pressure of the inlet filter of the 3rd-stage air expander (CPD3); Differential pressure of the inlet filter of the 4th-stage air expander (CPD4); Differential pressure of the self-sealing main pipe of the shaft seal of the air expander (CPD5); Differential pressure of the oil filter (CPD6); Air pressure at the outlet of the internal evaporator in the cold storage system (CP0); Pressure before the emergency cut-off valve at the inlet of the 1st-stage air expander (CP1-1); Pressure after the regulating valve at the inlet of the 1st-stage air expander (CP1-2); Pressure at the outlet of the 1st-stage air expander (CP2); Pressure at the inlet of the 2nd-stage air expander (CP3); Pressure at the outlet of the 2nd-stage air expander (CP4); Pressure at the inlet of the 3rd-stage air expander (CP5); Pressure at the outlet of the 3rd-stage air expander (CP6); Pressure at the inlet of the 4th-stage air expander (CP7); Pressure at the outlet of the 4th-stage air expander (CP8); Oil supply pressure of the lubricating oil main pipe (CP9 - CP11); Gas supply pressure of the self-sealing main pipe of the shaft seal of the air expander (CP12); Pressure of the water supply main pipe of the circulating cooling water system (CP13); Air temperature at the outlet of the internal evaporator in the cold storage system (CT0); Temperature at the inlet of the 1st-stage air expander (CT1); Temperature at the outlet of the 1st-stage air expander (CT2); Temperature at the inlet of the 2nd-stage air expander (CT3); Temperature at the outlet of the 2nd-stage air expander (CT4); Temperature at the inlet of the 3rd-stage air expander (CT5); Temperature at the outlet of the 3rd-stage air expander (CT6); Temperature at the inlet of the 4th-stage air expander (CT7); Temperature at the outlet of the 4th-stage air expander (CT8); Temperature of the oil in the lubricating oil tank (CT9); Temperature of the lubricating oil return (CT10); Temperature of the A-phase coil of the generator (CT11); Temperature of the B-phase coil of the generator (CT12); Temperature of the C-phase coil of the generator (CT13); Temperature of the #1 support bearing of the generator (CT14); Temperature of the #2 support bearing of the generator (CT15); Temperature of the #1 support bearing of the high-speed shaft of the speed reducer (CT16); Temperature of the #2 support bearing of the high-speed shaft of the speed reducer (CT17); Temperature of the #1 support bearing of the main shaft after speed reduction of the speed reducer (CT18); Temperature of the #2 support bearing of the main shaft after speed reduction of the speed reducer (CT19); Temperature of the #1 support bearing of the low-speed shaft of the speed reducer (CT20); Temperature of the #2 support bearing of the low-speed shaft of the speed reducer (CT21); Temperature of the self-sealing gas supply of the shaft seal of the air expander (CT22); Temperature of the lubricating oil at the outlet of the oil cooler (CT23); Temperature of the #1 support bearing of the 1st-stage air expander (CT24); Temperature of the #2 support bearing of the 1st-stage air expander (CT25); Temperature of the #1 support bearing of the 2nd-stage air expander (CT26); Temperature of the #2 support bearing of the 2nd-stage air expander (CT27); Temperature of the #1 support bearing of the 3rd-stage air expander (CT28); Temperature of the #2 support bearing of the 3rd-stage air expander (CT29); Temperature of the #1 support bearing of the 4th-stage air expander (CT30); Temperature of the #2 support bearing of the 4th-stage air expander (CT31); Temperature of the working surface of the thrust bearing of the high-speed shaft (CT32); Temperature of the non-working surface of the thrust bearing of the high-speed shaft (CT33); Temperature of the working surface of the thrust bearing of the low-speed shaft (CT34); Temperature of the non-working surface of the thrust bearing of the low-speed shaft (CT35);(CV1x / CV1y) X / Y axial vibration of the support bearing of the high-speed shaft #1 of the speed reducer; (CV2x / CV2y) X / Y axial vibration of the support bearing of the high-speed shaft #2 of the speed reducer; (CV3x / CV3y) X / Y axial vibration of the support bearing of the low-speed shaft #1 of the speed reducer; (CV4x / CV4y) X / Y axial vibration of the support bearing of the low-speed shaft #2 of the speed reducer; (CV5x / CV5y) Vibration of the support bearing #1 of the first-stage air expander; (CV6x / CV6y) Vibration of the support bearing #2 of the first-stage air expander; (CV7x / CV7y) Vibration of the support bearing #1 of the second-stage air expander; (CV8x / CV8y) Vibration of the support bearing #2 of the second-stage air expander; (CV9x / CV9y) Vibration of the support bearing #1 of the third-stage air expander; (CV10x / CV10y) Vibration of the support bearing #2 of the third-stage air expander; (CV11x / CV11y) Vibration of the support bearing #1 of the fourth-stage air expander; (CV12x / CV12y) Vibration of the support bearing #2 of the fourth-stage air expander; CF1) Flow rate of the shaft seal isolation gas supplied by the instrument / plant compressed air system to the air expander; CF2) Lubricating oil return flow rate; CF3) Flow rate of the circulating cooling water return main pipe; CL1) Lubricating oil tank liquid level; CZ1) Axial displacement of the high-speed shaft; CZ2) Axial displacement of the low-speed shaft; CS1-CS3) High-speed shaft speed; CS4-CS6) Low-speed shaft speed; CS7-CS9) Generator speed.;

[0063] Specifically, the multiple measurement points provided on the compressed control energy storage power station may include:

[0064] Differential pressure measuring points respectively set at the self-sealing main pipe of the air expander shaft seal, the oil filter, and the inlet filter screens of each stage of the air expander; air pressure measuring points set at the outlet of the evaporator in the cold storage system; pressure measuring points respectively set in front of the emergency cut-off valve at the inlet of the first-stage air expander, behind the regulating valve at the inlet of the first-stage air expander, the supply main pipe of the circulating cooling water system, the outlets of each stage of the air expander, and at the inlets of the second to fourth-stage air expanders; oil supply pressure measuring points set at the lubricating oil main pipe; air supply pressure measuring points set at the self-sealing main pipe of the air expander shaft seal; air temperature measuring points set at the outlet of the evaporator in the cold storage system; temperature measuring points respectively set at the generator coil, the generator support bearing, the inlets of each stage of the air expander, the outlets of each stage of the air expander, the support bearing of the high-speed shaft of the speed reducer, the support bearing of the main shaft after speed reduction of the speed reducer, the support bearing of the low-speed shaft of the speed reducer, the support bearings of each stage of the air expander, the thrust bearing of the high-speed shaft, and the thrust bearing of the low-speed shaft; air supply temperature measuring points set at the self-sealing of the air expander shaft seal; lubricating oil temperature measuring points set at the outlet of the oil cooler; oil temperature measuring points set at the lubricating oil tank; oil return temperature measuring points set at the lubricating oil; X / Y axial vibration measuring points respectively set at the support bearings of the high-speed shaft and the low-speed shaft of the speed reducer; vibration measuring points respectively set at the support bearings of each stage of the air expander; isolation gas flow measuring points set at the air expander shaft seal for the instrument / plant use compressed air system; lubricating oil return flow measuring points set at the lubricating oil tank; flow measuring points set at the return main pipe of the circulating cooling water; liquid level measuring points set at the lubricating oil tank; shaft displacement measuring points respectively set at the high-speed shaft and the low-speed shaft; speed measuring points respectively set at the high-speed shaft and the low-speed shaft, and speed measuring points set at the generator.

[0065] Specifically, the temperature measurement points at the generator coils may include: temperature measurement points respectively arranged at the generator phase A coil, generator phase B coil, and generator phase C coil; the temperature measurement points at the generator support bearings may include: temperature measurement points respectively arranged at the generator #1 support bearing and generator #2 support bearing; the temperature measurement points at the high-speed shaft support bearing of the speed reducer, the main shaft support bearing after speed reduction of the speed reducer, and the low-speed shaft support bearing of the speed reducer may include: temperature measurement points respectively arranged at the high-speed shaft #1 support bearing of the speed reducer, high-speed shaft #2 support bearing of the speed reducer, main shaft #1 support bearing after speed reduction of the speed reducer, main shaft #2 support bearing after speed reduction of the speed reducer, low-speed shaft #1 support bearing of the speed reducer, and low-speed shaft #2 support bearing of the speed reducer; the temperature measurement points at the support bearing of each stage of air expander include: temperature measurement points at the #1 support bearing and #2 support bearing of this stage of air expander; the temperature measurement points at the high-speed shaft thrust bearing and the low-speed shaft thrust bearing may include: temperature measurement points at the working surface of the high-speed shaft thrust bearing, non-working surface of the high-speed shaft thrust bearing, working surface of the low-speed shaft thrust bearing, and non-working surface of the low-speed shaft thrust bearing; the X / Y axial vibration measurement points at the high-speed shaft support bearing and low-speed shaft support bearing of the speed reducer may include: X / Y axial vibration measurement points at the high-speed shaft #1 support bearing of the speed reducer, high-speed shaft #2 support bearing of the speed reducer, low-speed shaft #1 support bearing of the speed reducer, and low-speed shaft #2 support bearing of the speed reducer; the vibration measurement points at the support bearing of each stage of air expander include: vibration measurement points at the #1 support bearing and #2 support bearing of this stage of air expander.

[0066] Specifically, the YY measurement points arranged at the XX component may be equivalent to the YY measurement points of the XX component, that is, as Figure 3 shown, the measurement points in this embodiment may include:

[0067] PD1) Differential pressure measurement point of the inlet filter of the 1st-stage air expander; PD2) Differential pressure measurement point of the inlet filter of the 2nd-stage air expander; PD3) Differential pressure measurement point of the inlet filter of the 3rd-stage air expander; PD4) Differential pressure measurement point of the inlet filter of the 4th-stage air expander; PD5) Differential pressure measurement point of the self-sealing main pipe of the shaft seal of the air expander; PD6) Differential pressure measurement point of the oil filter; P0) Air pressure measurement point at the outlet of the internal evaporator; P1-1) Air pressure measurement point before the emergency cut-off valve at the inlet of the 1st-stage air expander; P1-2) Air pressure measurement point after the regulating valve at the inlet of the 1st-stage air expander; P2) Air pressure measurement point at the outlet of the 1st-stage air expander; P3) Air pressure measurement point at the inlet of the 2nd-stage air expander; P4) Air pressure measurement point at the outlet of the 2nd-stage air expander; P5) Air pressure measurement point at the inlet of the 3rd-stage air expander; P6) Air pressure measurement point at the outlet of the 3rd-stage air expander; P7) Air pressure measurement point at the inlet of the 4th-stage air expander; P8) Air pressure measurement point at the outlet of the 4th-stage air expander; P9 - P11) Oil supply pressure measurement points of the lubricating oil main pipe; P12) Air supply pressure measurement point of the self-sealing main pipe of the shaft seal of the air expander; P13) Water pressure measurement point at the supply main pipe of the circulating cooling water system; T0) Air temperature measurement point at the outlet of the internal evaporator of the cold storage system; T1) Air temperature measurement point at the inlet of the 1st-stage air expander; T2) Air temperature measurement point at the outlet of the 1st-stage air expander; T3) Air temperature measurement point at the inlet of the 2nd-stage air expander; T4) Air temperature measurement point at the outlet of the 2nd-stage air expander; T5) Air temperature measurement point at the inlet of the 3rd-stage air expander; T6) Air temperature measurement point at the outlet of the 3rd-stage air expander; T7) Air temperature measurement point at the inlet of the 4th-stage air expander; T8) Air temperature measurement point at the outlet of the 4th-stage air expander; T9) Oil temperature measurement point in the lubricating oil tank; T10) Return oil temperature measurement point of the lubricating oil; T11) Coil temperature measurement point of phase A of the generator; T12) Coil temperature measurement point of phase B of the generator; T13) Coil temperature measurement point of phase C of the generator; T14) Temperature measurement point of the #1 support bearing of the generator; T15) Temperature measurement point of the #2 support bearing of the generator; T16) Temperature measurement point of the #1 support bearing of the high-speed shaft of the speed reducer; T17) Temperature measurement point of the #2 support bearing of the high-speed shaft of the speed reducer; T18) Temperature measurement point of the #1 support bearing of the main shaft after speed reduction of the speed reducer; T19) Temperature measurement point of the #2 support bearing of the main shaft after speed reduction of the speed reducer; T20) Temperature measurement point of the #1 support bearing of the low-speed shaft of the speed reducer; T21) Temperature measurement point of the #2 support bearing of the low-speed shaft of the speed reducer; T22) Air supply temperature measurement point of the self-sealing shaft seal of the air expander; T23) Lubricating oil temperature measurement point at the outlet of the oil cooler; T24) Temperature measurement point of the #1 support bearing of the 1st-stage air expander; T25) Temperature measurement point of the #2 support bearing of the 1st-stage air expander; T26) Temperature measurement point of the #1 support bearing of the 2nd-stage air expander; T27) Temperature measurement point of the #2 support bearing of the 2nd-stage air expander; T28) Temperature measurement point of the #1 support bearing of the 3rd-stage air expander; T29) Temperature measurement point of the #2 support bearing of the 3rd-stage air expander; T30) Temperature measurement point of the #1 support bearing of the 4th-stage air expander; T31) Temperature measurement point of the #2 support bearing of the 4th-stage air expander; T32) Working surface temperature measurement point of the thrust bearing of the high-speed shaftT33) Temperature measuring point on the non-working surface of the high-speed shaft thrust bearing; T34) Temperature measuring point on the working surface of the low-speed shaft thrust bearing; T35) Temperature measuring point on the non-working surface of the low-speed shaft thrust bearing; V1x / V1y) X / Y axial vibration measuring points of the #1 support bearing of the high-speed shaft of the speed reducer; V2x / V2y) X / Y axial vibration measuring points of the #2 support bearing of the high-speed shaft of the speed reducer; V3x / V3y) X / Y axial vibration measuring points of the #1 support bearing of the low-speed shaft of the speed reducer; V4x / V4y) X / Y axial vibration measuring points of the #2 support bearing of the low-speed shaft of the speed reducer; V5x / V5y) Vibration measuring points of the #1 support bearing of the first-stage air expander; V6x / V6y) Vibration measuring points of the #2 support bearing of the first-stage air expander; V7x / V7y) Vibration measuring points of the #1 support bearing of the second-stage air expander; V8x / V8y) Vibration measuring points of the #2 support bearing of the second-stage air expander; V9x / V9y) Vibration measuring points of the #1 support bearing of the third-stage air expander; V10x / V10y) Vibration measuring points of the #2 support bearing of the third-stage air expander; V11x / V11y) Vibration measuring points of the #1 support bearing of the fourth-stage air expander; V12x / V12y) Vibration measuring points of the #2 support bearing of the fourth-stage air expander; F1) Flow measuring point of the air supply for the shaft seal isolation of the air expander in the instrument / plant compressed air system; F2) Return oil flow measuring point of the lubricating oil; F3) Flow measuring point of the return water main pipe of the circulating cooling water; L1) Liquid level measuring point of the lubricating oil tank; Z1) Axial displacement measuring point of the high-speed shaft; Z2) Axial displacement measuring point of the low-speed shaft; S1~S3) High-speed shaft speed measuring points; S4~S6) Low-speed shaft speed measuring points; S7~S9) Generator speed measuring points.

[0068] Specifically, the measuring point can be a sensor, the differential pressure measuring point can be a differential pressure sensor, the pressure measuring point can be a pressure sensor, the temperature measuring point can be a temperature sensor, the vibration measuring point can be a vibration sensor, the flow measuring point can be a flow sensor, the liquid level measuring point can be a liquid level sensor or a liquid level gauge, the axial displacement measuring point can be an axial displacement sensor, and the speed measuring point can be a speed sensor.

[0069] The valves may include: an emergency cut-off valve provided at the inlet of the first-stage air expander; a first regulating valve provided at the inlet of the first-stage air expander; a second regulating valve provided at the exhaust of the fourth-stage air expander to the air compression system; a supply air pressure regulating valve provided at the self-sealing main pipe of the shaft seal of the air expander; self-sealing supply air pressure regulating valves respectively provided at each stage of the air expander; an isolation air flow regulating valve provided at the air supply for the shaft seal of the instrument / plant compressed air system to the air expander; a third regulating valve provided at the bypass of the expansion generator; a lubricating oil temperature regulating valve provided at the outlet of the oil cooler; a lubricating oil pressure regulating valve provided at the outlet of the oil filter.

[0070] Specifically, the first regulating valve can be a regulating valve installed at the inlet of the 1st-stage air expander, the second regulating valve can be a regulating valve installed at the outlet of the 4th-stage air expander leading to the air compression system, and the third regulating valve can be a regulating valve installed at the bypass of the expansion generator; the ZZ valve installed at the XX component can be equivalent to the ZZ valve of the XX component, such as Figure 3 shown. That is to say, the valves in this embodiment can include:

[0071] 1-1) Emergency cut-off valve at the inlet of the 1st-stage air expander; 1-2) Regulating valve at the inlet of the 1st-stage air expander; 1-3) Regulating valve at the outlet of the 4th-stage air expander leading to the air compression system; 1-4) Regulating valve for the supply pressure of the self-sealing main pipe of the air expander shaft seal; 1-5) Regulating valve for the self-sealing supply pressure of the 1st-stage air expander; 1-6) Regulating valve for the self-sealing supply pressure of the 2nd-stage air expander; 1-7) Regulating valve for the self-sealing supply pressure of the 3rd-stage air expander; 1-8) Regulating valve for the self-sealing supply pressure of the 4th-stage air expander; 1-9) Regulating valve for the flow rate of the isolating gas supplied by the instrument / plant compressed air system to the air expander shaft seal; 1-10) Regulating valve for the bypass of the expansion generator; 1-11) Regulating valve for the lubricating oil temperature at the outlet of the oil cooler; 1-12) Regulating valve for the lubricating oil pressure at the outlet of the oil filter.

[0072] Specifically, the compressed air energy storage power station can include: electrical protection devices, electrical cabinets, heat release systems, expansion power generation systems, circulating cooling water systems, cold energy storage systems, and instrument / plant compressed air systems, etc. The electrical cabinets can include: high-voltage switch cabinets, low-voltage distribution cabinets, and grid connection cabinets; among them,

[0073] The cold energy storage system can include: evaporators, cryogenic liquid storage tanks, cryogenic pumps, and circulating fans, etc. The evaporator is usually connected to the cryogenic liquid storage tank, the cryogenic pump is connected to the cryogenic liquid storage tank, the circulating fan can be connected to the evaporator and / or the cryogenic liquid storage tank, and the cryogenic pump can be connected to the air expander. The low-temperature refrigerant or coolant generated by the evaporator flows into the cryogenic liquid storage tank for storage, and the cryogenic pump extracts the low-temperature liquid from the cryogenic liquid storage tank and transports it to the air expander.

[0074] The heat release system can include: high-temperature heat storage tanks, inter-stage reheaters, high-temperature heat storage medium pumps, and isolating valves for the high-temperature heat storage medium pump leading to the inter-stage reheaters, etc. The isolating valve for the high-temperature heat storage medium pump leading to the inter-stage reheaters can be installed between the high-temperature heat storage medium pump and the inter-stage reheaters to control the flow path of the high-temperature heat storage medium; the high-temperature heat storage medium pump can extract the high-temperature heat storage medium from the high-temperature heat storage tank and transport it to the inter-stage reheaters, and the inter-stage reheaters can transfer heat to the air expander.

[0075] The circulating cooling water system can include: the supply main pipe of the circulating cooling water system and circulating cooling water pumps, etc.

[0076] The instrument / plant service compressed air system may include: a shaft seal for the air expander, an air compressor, a supply header pipe, and a shaft seal for the expansion generator; the air compressor is connected to the supply header pipe, and the supply header pipe is respectively connected to the shaft seal for the air expander and the shaft seal for the expansion generator. The air compressor transports compressed air to the supply header pipe, and the supply header pipe transports the sealing gas to the shaft seal for the air expander and the shaft seal for the expansion generator respectively.

[0077] As Figure 3 shown, the expansion power generation system may include: 1) a first-stage air expander; 2) a second-stage air expander; 3) a third-stage air expander; 4) a fourth-stage air expander; 5) a speed reducer; 6) a generator. The expansion power generation system may further include: an air expander inlet filter, a shaft seal self-sealing main pipe for the air expander, and a lubricating oil auxiliary system, etc. The speed reducer may be respectively connected to the second-stage air expander, the third-stage air expander, and the generator. The first-stage air expander is connected to the second-stage air expander, and the fourth-stage air expander is connected to the third-stage air expander. The air expander inlet filter may be arranged at the air expander inlet to filter the air entering the expander. The shaft seal self-sealing main pipe for the air expander may be connected to the air expander to provide sealing gas for the shaft seal system of the expander.

[0078] The lubricating oil auxiliary system may include: an oil filter, an oil cooler, a lubricating oil tank, a lubricating oil main pipe, an AC lubricating oil pump, etc. The lubricating oil tank may serve as a storage container for the lubricating oil, and an oil filter and an AC lubricating oil pump are provided inside. The inlet of the oil cooler is connected to the outlet of the AC lubricating oil pump, and the outlet of the oil cooler is connected to the lubricating oil main pipe. The AC lubricating oil pump sucks oil from the lubricating oil tank, and after being filtered by the oil filter, one path supplies the main oil pump, and the other path enters the lubricating oil main pipe after being cooled by the oil cooler. The lubricating oil main pipe may distribute the cooled lubricating oil to each lubrication point.

[0079] Embodiment 2

[0080] In order to improve the reliability of the control and protection of the expansion generator, in one embodiment, the control module is used to obtain first measurement data, monitor the feedback signals of the first equipment in the compressed control energy storage power station, and control the emergency cut-off valve arranged at the inlet of the first-stage air expander, the first regulating valve arranged at the inlet of the first-stage air expander, the second regulating valve arranged at the exhaust of the fourth-stage air expander to the air compression system, and the third regulating valve arranged at the bypass of the expansion generator according to the first measurement data, the feedback signals of the first equipment, and the expansion generator control and protection strategy, so as to complete the control and protection of the expansion generator in the expansion power generation system; wherein, the first measurement data includes: differential pressure measurement points respectively arranged at the shaft seal self-sealing main pipe of the air expander, the oil filter, and the inlet filter screens of each stage of the air expander, pressure measurement points respectively arranged in front of the emergency cut-off valve at the inlet of the first-stage air expander and at the water supply main pipe of the circulating cooling water system, a gas supply pressure measurement point arranged at the shaft seal self-sealing main pipe of the air expander, an oil supply pressure measurement point arranged at the lubricating oil main pipe, temperature measurement points respectively arranged at the generator coil, the generator support bearing, the reducer support bearing, the support bearings of each stage of the air expander, the high-speed shaft thrust bearing, and the low-speed shaft thrust bearing, an oil temperature measurement point arranged at the lubricating oil tank, X / Y axial vibration measurement points respectively arranged at the high-speed shaft support bearing and the low-speed shaft support bearing of the reducer, vibration measurement points respectively arranged at the support bearings of each stage of the air expander, an isolation gas flow measurement point arranged at the instrument / plant use compressed air system for supplying air to the shaft seal of the air expander, a flow measurement point arranged at the circulating cooling water return main pipe, a liquid level measurement point arranged at the lubricating oil tank, shaft displacement measurement points respectively arranged at the high-speed shaft and the low-speed shaft, speed measurement points respectively arranged at the high-speed shaft and the low-speed shaft, and the measurement data collected by the speed measurement point arranged at the generator; the first equipment includes: an electrical protection device, an electrical cabinet, a circulating cooling water system, each of the measurement points and valves.

[0081] Specifically, the measurement data collected by the YY measurement point arranged at the XX component can be equivalent to the XX component YY. For example, the measurement data collected by the differential pressure measurement point arranged at the shaft seal self-sealing main pipe of the air expander is equivalent to the differential pressure of the shaft seal self-sealing main pipe of the air expander. The measurement data of each of the measurement points includes: the first measurement data. The multiple equipment in the compressed control energy storage power station includes the first equipment.

[0082] The controlling the emergency cut-off valve arranged at the inlet of the first-stage air expander, the first regulating valve arranged at the inlet of the first-stage air expander, the second regulating valve arranged at the exhaust of the fourth-stage air expander to the air compression system, and the third regulating valve arranged at the bypass of the expansion generator according to the first measurement data, the feedback signals of the first equipment, and the expansion generator control and protection strategy to complete the control and protection of the expansion generator in the expansion power generation system may include:

[0083] Based on the first measurement data and the feedback signal of the first device, if the expansion generator meets each condition in the first condition group, trigger the expansion generator to allow valve opening for startup; if the expansion generator meets at least one condition in the second condition group, trigger an alarm; if the expansion generator meets each condition in the third condition group, trigger an alarm and interlock for shutdown; when at least one of triggering the expansion generator to allow valve opening for startup, triggering an alarm, and triggering an alarm and interlock for shutdown occurs, send an alarm and interlock shutdown signal to the expansion generator, interlock to close the emergency cut-off valve, the first regulating valve, and the second regulating valve, interlock to open the third regulating valve, interlock to start the AC lubricating oil pump. At the same time, the outlet circuit breaker of the expansion generator trips and the expansion generator remains in the shutdown state.

[0084] Specifically, the feedback signal of the first device may include: feedback signals of non-faulty points of each measuring point and valve, feedback signals of the energization of high-voltage electricity, low-voltage electricity, electrical protection devices, electrical cabinets, and grid connection cabinets, feedback signals of the disconnection of high-voltage electricity, low-voltage electricity, electrical protection devices, electrical cabinets, and grid connection cabinets, feedback signal of the operation of the air compressor in the instrument / plant compressed air system, and feedback signal of the disconnection of the air compressor in the instrument / plant compressed air system; if all of the following conditions are met, the expansion generator is allowed to open the valve for startup, that is, the first condition group includes:

[0085] 1) All the conditions of the thermal measurement points are met: including the measurement points of temperature, pressure, flow rate, rotational speed, axial displacement, differential expansion, eccentricity, vibration, liquid level, load, etc. related to the expansion power generation system, as well as the feedback non-fault points of related valves (such as open, closed, valve position feedback, etc.), equipment speed regulating devices (such as the scoop tube valve position of the hydraulic coupling, the frequency of the frequency converter, etc.); 2) The input feedback signals of high-voltage electricity, low-voltage electricity, electrical protection devices, electrical cabinets, grid connection cabinets, etc. have been triggered and the cut-off feedback signals have not been triggered; 3) The operation feedback signal of the air compressor in the instrument / plant compressed air system has been triggered and the shutdown feedback signal has not been triggered. At the same time, the pressure of the air supply main pipe of the instrument / plant compressed air system reaches the preset normal pressure value; 4) CPD1 ≤ the preset normal differential pressure value; 5) CPD2 ≤ the preset normal differential pressure value; 6) CPD3 ≤ the preset normal differential pressure value; 7) CPD4 ≤ the preset normal differential pressure value; 8) CPD5 ≤ the preset normal differential pressure value; 9) CPD6 ≤ the preset normal differential pressure value; 10) CP1-1 ≥ the preset normal pressure value; 11) CP12 ≥ the preset normal pressure value; 12) (CP9~CP11) Select 2 out of 3 ≥ the preset normal pressure value; 13) The operation feedback signal of the circulating cooling water pump in the circulating cooling water system has been triggered and the shutdown feedback signal has not been triggered. At the same time, CP13 ≥ the preset normal pressure value; 14) CT9 ≥ the preset low temperature value 1; 15) CT11~CT13 ≤ the preset normal temperature value; 16) CT14~CT15 ≤ the preset normal temperature value; 17) CT16~CT21 ≤ the preset normal temperature value; 18) CT24~CT31 ≤ the preset normal temperature value; 19) CT32~CT35 ≤ the preset normal temperature value;

[0086] 20) CV1x / CV1y~CV12x / CV12y ≤ the preset normal amplitude value; 21) The flow rate CF1 of the shaft seal isolation gas supplied to the expansion generator by the instrument / plant compressed air system ≥ the preset normal flow rate value; 22) CF3 ≥ the preset normal flow rate value;

[0087] 23) CL1 ≥ the preset normal liquid level value; 24) The preset low axial displacement value 1 ≤ CZ1 ≤ the preset high axial displacement value 1;

[0088] 25) The preset low axial displacement value 1 ≤ CZ2 ≤ the preset high axial displacement value 1; 26) The operating personnel manually reset the shutdown interlock of the expansion generator.

[0089] The alarm conditions are triggered when the parameters of the expansion generator body exceed the limit. That is, the second condition group can include:

[0090] 1) An alarm is triggered when any two out of three (CS1~CS3) are greater than or equal to the preset high rotation speed value 1; 2) An alarm is triggered when any two out of three (CS4~CS6) are greater than or equal to the preset high rotation speed value 1; 3) An alarm is triggered when CPD1 is greater than or equal to the preset high differential pressure value 1; 4) An alarm is triggered when CPD2 is greater than or equal to the preset high differential pressure value 1; 5) An alarm is triggered when CPD3 is greater than or equal to the preset high differential pressure value 1; 6) An alarm is triggered when CPD4 is greater than or equal to the preset high differential pressure value 1; 7) An alarm is triggered when CPD5 is greater than or equal to the preset high differential pressure value 1; 8) An alarm is triggered when CPD6 is greater than or equal to the preset high differential pressure value 1; 9) An alarm is triggered when CP1-1 is less than or equal to the preset low pressure value 1; 10) An alarm is triggered when any two out of three (CP9~CP11) are less than or equal to the preset low pressure value 2; 11) An alarm is triggered when CP12 is less than or equal to the preset low pressure value 1; 12) An alarm is triggered when CP13 is less than or equal to the preset low pressure value 1; 13) An alarm is triggered when CT9 is less than or equal to the preset low temperature value 2; 14) An alarm is triggered when any one of CT11~CT13 is greater than or equal to the preset high temperature value 1; 15) An alarm is triggered when any one of CT14~CT15 is greater than or equal to the preset high temperature value 1; 16) An alarm is triggered when any one of CT16~CT21 is greater than or equal to the preset high temperature value 1; 17) An alarm is triggered when any one of CT24~CT31 is greater than or equal to the preset high temperature value 1;

[0091] 18) An alarm is triggered when any one of CT32~CT35 is greater than or equal to the preset high temperature value 1; 19) An alarm is triggered when any one of CV1x~CV12x is greater than or equal to the preset high amplitude value 1; 20) An alarm is triggered when any one of CV1y~CV12y is greater than or equal to the preset high amplitude value 1; 21) An alarm is triggered when CF1 is less than or equal to the preset low flow value 1; 22) An alarm is triggered when CF3 is less than or equal to the preset low flow value 1; 23) An alarm is triggered when CL1 is less than or equal to the preset low liquid level value 1; 24) An alarm is triggered when CZ1 is less than or equal to the preset low shaft displacement value 2 or CZ1 is greater than or equal to the preset high shaft displacement value 2; 25) An alarm is triggered when CZ2 is less than or equal to the preset low shaft displacement value 2 or CZ2 is greater than or equal to the preset high shaft displacement value 2.

[0092] Alarm and interlock shutdown conditions are triggered when the parameters of the expansion generator body exceed the limits. That is, the third condition group can include:

[0093] 1) (CS1 to CS3), 2 out of 3 ≥ preset high rotation speed value 2; 2) (CS4 to CS6), 2 out of 3 ≥ preset high rotation speed value 2; 3) (CP9 to CP11), 2 out of 3 ≤ preset low pressure value 4; 4) CP12 ≤ preset low pressure value 2; 5) CP13 ≤ preset low pressure value 2; 6) CT9 ≤ preset low temperature value 3; 7) Any one of CT11 to CT13 ≥ preset high temperature value 2; 8) Any one of CT14 to CT15 ≥ preset high temperature value 2; 9) Any one of CT16 to CT21 ≥ preset high temperature value 2; 10) Any one of CT24 to CT31 ≥ preset high temperature value 2; 11) Any one of CT32 to CT35 ≥ preset high temperature value 2; 12) CV1x or CV1y ≥ preset high amplitude value 2 and CV2x or CV2y ≥ preset high amplitude value 2; 13) CV3x or CV3y ≥ preset high amplitude value 2 and CV4x or CV4y ≥ preset high amplitude value 2; 14) CV5x or CV5y ≥ preset high amplitude value 2 and CV6x or CV6y ≥ preset high amplitude value 2; 15) CV7x or CV7y ≥ preset high amplitude value 2 and CV8x or CV8y ≥ preset high amplitude value 2; 16) CV9x or CV9y ≥ preset high amplitude value 2 and CV10x or CV10y ≥ preset high amplitude value 2; 17) CV11x or V11y ≥ preset high amplitude value 2 and CV12x or CV12y ≥ preset high amplitude value 2; 18) CF1 ≤ preset low flow value 2; 19) CF3 ≤ preset low flow value 2; 20) CL1 ≤ preset low liquid level value 2; 21) CZ1 ≤ preset low shaft displacement value 3 or CZ1 ≥ preset high shaft displacement value 3; 22) CZ2 ≤ preset low shaft displacement value 3 or CZ2 ≥ preset high shaft displacement value 3; 23) The PLC / DCS system outputs a shutdown or fault signal; 24) The grid connection cabinet outputs a shutdown or fault signal; 25) The front panel or local emergency stop button triggers a shutdown.

[0094] If at least one of the first condition, the second condition, and the third condition is satisfied, where the first condition is that the expansion generator satisfies each condition in the first condition group, the second condition is that the expansion generator satisfies at least one condition in the second condition group, and the third condition is that the expansion generator satisfies each condition in the third condition group, the PLC / DCS system can send an alarm interlock shutdown signal to the unit and interlock to close 1-1, 1-2, 1-3, interlock to open 1-10, and interlock to start the AC lubricating oil pump. At the same time, the generator outlet circuit breaker trips and keeps the unit in a shutdown state and unable to restart by reclosing. Only after all the above alarm values are reset and the operating personnel analyze and confirm the shutdown reason and then manually reset the shutdown interlock can the unit be restarted by reclosing, avoiding the unit automatically starting after all the above alarm values are reset. The preset values can all be set according to the actual situation, and this application does not limit this.

[0095] Embodiment 3

[0096] In order to improve the reliability of the control and protection of the lubricating oil auxiliary system, in one embodiment, the control module is used to obtain second measurement data, and according to the second measurement data and the control and protection strategy of the lubricating oil auxiliary system, control the lubricating oil temperature regulating valve arranged at the outlet of the oil cooler and the lubricating oil pressure regulating valve arranged at the outlet of the oil filter to complete the control and protection of the lubricating oil auxiliary system of the expansion power generation system; wherein, the second measurement data includes: measurement data collected by an oil temperature measuring point arranged at the lubricating oil tank, a liquid level measuring point arranged at the lubricating oil tank, a supply air pressure measuring point arranged at the shaft seal self-sealing main pipe of the air expander, a supply oil pressure measuring point arranged at the lubricating oil main pipe, a rotational speed measuring point arranged at the generator, and a lubricating oil temperature measuring point arranged at the outlet of the oil cooler.

[0097] Specifically, the measurement data of each of the measuring points includes the second measurement data. The controlling the lubricating oil temperature regulating valve arranged at the outlet of the oil cooler and the lubricating oil pressure regulating valve arranged at the outlet of the oil filter according to the second measurement data and the control and protection strategy of the lubricating oil auxiliary system to complete the control and protection of the lubricating oil auxiliary system of the expansion power generation system may include:

[0098] Based on the second measurement data, if the electric heater is manually shut down or the oil temperature in the lubricating oil tank is greater than or equal to the preset high temperature value, then interlock to shut down the electric heater in the lubricating oil tank; if the lubricating oil auxiliary system meets at least one condition in the fourth condition group, then interlock to start the electric heater in the lubricating oil tank, and the fourth condition group includes: the condition of manually starting the electric heater, the condition that the lubricating oil tank liquid level ≥ the preset high liquid level value and the lubricating oil tank oil temperature ≤ the preset low temperature value 1; if the supply air pressure of the shaft seal self-sealing main pipe of the air expander ≥ the preset low pressure value 2 and the lubricating oil tank oil temperature ≥ the preset low temperature value 2, then start the AC lubricating oil pump; if the lubricating oil auxiliary system meets at least one condition in the fifth condition group, then interlock to shut down the AC lubricating oil pump, and the conditions in the fifth condition group include: the condition of manually shutting down the AC lubricating oil pump; the condition that at least two of the supply oil pressures of the lubricating oil main pipe at multiple measuring points are ≥ the preset high pressure value; the condition that the supply air pressure of the shaft seal self-sealing main pipe of the air expander ≤ the preset low pressure value 3, and at the same time the expansion generator shutdown feedback signal has been triggered and the operation feedback signal has not been triggered; if the lubricating oil auxiliary system meets at least one condition in the sixth condition group, then interlock to start the AC lubricating oil pump, and the conditions in the sixth condition group include: the condition of manually starting the AC lubricating oil pump; the condition that the expansion generator triggers an alarm and interlocks to shut down; the condition that at least two of the supply oil pressures of the lubricating oil main pipe at multiple measuring points are ≤ the fourth preset low pressure value 1; the condition that at least two of the rotational speeds of the generator at multiple measuring points are ≤ the preset low speed value 1; control the lubricating oil temperature regulating valve to input the automatic control of the lubricating oil temperature at the outlet of the oil cooler; control the lubricating oil pressure regulating valve to input the automatic control of the supply oil pressure of the lubricating oil main pipe.

[0099] Specifically, (1) the electric heater in the lubricating oil tank shall be interlocked and stopped under any of the following conditions:

[0100] 1) Manually stop the electric heater; 2) When CT9 ≥ the high preset temperature value, the electric heater shall be interlocked and stopped.

[0101] (2) The electric heater in the lubricating oil tank shall be interlocked and started under any of the following conditions:

[0102] 1) Manually start the electric heater; 2) When CL1 ≥ the high preset liquid level value and CT9 ≤ the first low preset temperature value, the electric heater shall be interlocked and started. (3) Permissible conditions for starting the AC lubricating oil pump: CP12 ≥ the second low preset pressure value and CT9 ≥ the second low preset temperature value.

[0103] (4) The AC lubricating oil pump shall be interlocked and stopped under any of the following conditions:

[0104] 1) Manually stop the AC lubricating oil pump; 2) When any 2 out of (CP9~CP11) ≥ the high preset pressure value, the AC lubricating oil pump shall be interlocked and stopped; 3) When CP12 ≤ the third low preset pressure value, the shutdown feedback signal of the expansion generator has been triggered and the operation feedback signal has not been triggered, and after a preset delay time, the AC lubricating oil pump shall be interlocked and stopped.

[0105] (5) The AC lubricating oil pump shall be interlocked and started under any of the following conditions:

[0106] 1) Manually start the AC lubricating oil pump; 2) The expansion generator triggers the alarm interlock shutdown condition; 3) When any 2 out of (CP9~CP11) ≤ the first low preset pressure value, the AC lubricating oil pump shall be interlocked and started; 4) When any 2 out of (CS7~CS9) ≤ the first low preset speed value, the AC lubricating oil pump shall be interlocked and started.

[0107] (6) The DC lubricating oil pump shall be interlocked and started under any of the following conditions:

[0108] 1) Any 2 out of (CP9~CP11) ≤ the third low preset pressure value; 2) When any 2 out of (CS7~CS9) ≤ the first low preset speed value and after a preset delay time, the shutdown feedback signal of the AC lubricating oil pump has been triggered and the operation feedback signal has not been triggered, the DC lubricating oil pump shall be interlocked and started; 3) The expansion generator triggers the alarm interlock shutdown condition and after a preset delay time, the shutdown feedback signal of the AC lubricating oil pump has been triggered and the operation feedback signal has not been triggered, the DC lubricating oil pump shall be interlocked and started.

[0109] (7) Automatic control: 1) For 1 - 11, the temperature automatic control of CT23 is enabled; 2) For 1 - 12, the pressure automatic control of the average value of any 3 out of (CP9~CP11) is enabled.

[0110] Example 4

[0111] In order to improve the reliability of the automatic regulation of the sealing gas, isolation gas, and bypass of the air expander, in one embodiment, the control module is used to obtain the third measurement data, and according to the third measurement data and the bypass control protection strategy of the air expander, control the supply pressure regulating valve arranged at the self-sealing main pipe of the air expander shaft seal, the self-sealing supply pressure regulating valve arranged at each stage of the air expander, the isolation gas flow regulating valve arranged at the shaft seal of the air expander supplied by the instrument / plant compressed air system, and the third regulating valve arranged at the bypass of the expansion generator to complete the control protection of the sealing gas, isolation gas, and bypass of the air expander in the expansion power generation system; wherein, the third measurement data includes: the measurement data collected by the supply pressure measuring point arranged at the self-sealing main pipe of the air expander shaft seal, the pressure measuring points arranged after the inlet regulating valve of the first-stage air expander and at the inlets of the second to fourth-stage air expanders, the isolation gas flow measuring point arranged at the shaft seal of the air expander supplied by the instrument / plant compressed air system, and the air temperature measuring point arranged at the outlet of the evaporator in the cold storage system. The measurement data of each of the said measuring points contains: the third measurement data.

[0112] The controlling the supply pressure regulating valve arranged at the self-sealing main pipe of the air expander shaft seal, the self-sealing supply pressure regulating valve arranged at each stage of the air expander, the isolation gas flow regulating valve arranged at the shaft seal of the air expander supplied by the instrument / plant compressed air system, and the third regulating valve arranged at the bypass of the expansion generator according to the third measurement data and the bypass control protection strategy of the air expander to complete the control protection of the sealing gas, isolation gas, and bypass of the air expander in the expansion power generation system may include:

[0113] Controlling the supply pressure regulating valve to engage in the pressure automatic control of the supply pressure of the self-sealing main pipe of the air expander shaft seal;

[0114] According to the real-time value of the pressure after the inlet regulating valve of each stage of the air expander minus the offset, controlling the self-sealing supply pressure regulating valve at this stage of the air expander to engage in the pressure automatic control;

[0115] Controlling the isolation gas flow regulating valve to engage in the flow automatic control of the isolation gas flow of the shaft seal of the air expander supplied by the instrument / plant compressed air system;

[0116] Controlling the third regulating valve to engage in the pressure automatic control of the air pressure at the outlet of the evaporator in the cold storage system.

[0117] Specifically, 1) The pressure of CP12 for 1-4 injection is automatically controlled; 2) The pressure of 1-5 injection is automatically controlled (the automatic tracking value can refer to the real-time value of CP1-2 minus the offset); 3) The pressure of 1-6 injection is automatically controlled (the automatic tracking value can refer to the real-time value of CP3 minus the offset); 4) The pressure of 1-7 injection is automatically controlled (the automatic tracking value can refer to the real-time value of CP5 minus the offset); 5) The pressure of 1-8 injection is automatically controlled (the automatic tracking value can refer to the real-time value of CP7 minus the offset). (2) Isolation gas automatic regulation setting: The flow rate of CF1 for 1-9 injection is automatically controlled. (3) Bypass automatic regulation setting: The pressure of CP0 for 1-10 injection is automatically controlled (the automatic tracking value is a fixed value before the expansion generator is connected to the grid and is a curve that changes with the load after the expansion generator is connected to the grid).

[0118] Embodiment 5

[0119] In order to improve the reliability of the interlock shutdown control between the expansion generator and other equipment, in one embodiment, the control module is used for:

[0120] Judge whether the liquid level height of the low-temperature liquid storage tank in the cold storage system is less than or equal to the preset low liquid level value. If so, interlock to stop the operation of the expansion generator, interlock to stop the operation of the cryogenic pump and the circulation fan in the cold storage system, interlock to close the isolation valve of the high-temperature heat storage medium pump in the heat release system leading to the inter-stage reheater and interlock to open the recirculation regulating valve. After a preset time, interlock to stop the operation of the high-temperature heat storage medium pump;

[0121] Monitor the shutdown feedback signal and the operation feedback signal of the expansion generator. If the shutdown feedback signal of the expansion generator has been triggered and the operation feedback signal has not been triggered, interlock to stop the operation of the cryogenic pump and the circulation fan in the cold storage system, interlock to close the isolation valve of the high-temperature heat storage medium pump in the heat release system leading to the inter-stage reheater and interlock to open the recirculation regulating valve. After a preset time, interlock to stop the operation of the high-temperature heat storage medium pump;

[0122] Monitor the shutdown feedback signal and the operation feedback signal of all high-temperature heat storage medium pumps in the heat release system. If the shutdown feedback signals of all high-temperature heat storage medium pumps in the heat release system have been triggered and the operation feedback signals have not been triggered, then after a preset time, interlock to stop the operation of the expansion generator, the cryogenic pump and the circulation fan in the cold storage system;

[0123] Monitor the shutdown feedback signal and the operation feedback signal of all cryogenic pumps in the cold storage system. If the shutdown feedback signals of all cryogenic pumps in the cold storage system have been triggered and the operation feedback signals have not been triggered, then after a preset time, interlock to stop the operation of the expansion generator and the circulation fan in the cold storage system, interlock to close the isolation valve of the high-temperature heat storage medium pump in the heat release system leading to the inter-stage reheater, interlock to open the recirculation regulating valve. After a preset time, interlock to stop the operation of the high-temperature heat storage medium pump;

[0124] Monitor the shutdown feedback signals and operation feedback signals of all circulating fans in the chilled water storage system. If all the shutdown feedback signals of the circulating fans in the chilled water storage system have been triggered and the operation feedback signals have not been triggered, then after a preset time, interlock to stop the operation of the expansion generator and the cryogenic pumps in the chilled water storage system, interlock to close the isolation valves of the high-temperature heat storage medium pumps in the heat release system leading to the intermediate reheaters at all levels, interlock to open the recirculation regulating valve, and after a preset time, interlock to stop the operation of the high-temperature heat storage medium pumps;

[0125] Monitor the shutdown feedback signals and operation feedback signals of all circulating cooling water pumps in the circulating cooling water system. If all the shutdown feedback signals of the circulating cooling water pumps in the circulating cooling water system have been triggered and the operation feedback signals have not been triggered, then after a preset time, interlock to stop the operation of the expansion generator, the cryogenic pumps and the circulating fans in the chilled water storage system, and the high-temperature heat storage medium pumps in the heat release system.

[0126] Specifically, (1) When the liquid level height of the low-temperature liquid storage tank in the chilled water storage system ≤ the low preset liquid level value, interlock to stop the operation of the expansion generator, interlock to stop the cryogenic pumps and the circulating fans in the chilled water storage system, and at the same time, interlock to close the isolation valves of the high-temperature heat storage medium pumps in the heat release system leading to the intermediate reheaters at all levels and interlock to open the recirculation regulating valve. After a preset delay time, interlock to stop the operation of the high-temperature heat storage medium pumps or manually stop them by the operator;

[0127] (2) When the shutdown feedback signal of the expansion generator has been triggered and the operation feedback signal has not been triggered, interlock to stop the cryogenic pumps and the circulating fans in the chilled water storage system, and at the same time, interlock to close the isolation valves of the high-temperature heat storage medium pumps in the heat release system leading to the intermediate reheaters at all levels and interlock to open the recirculation regulating valve. After a preset delay time, interlock to stop the operation of the high-temperature heat storage medium pumps or manually stop them by the operator;

[0128] (3) When all the shutdown feedback signals of the high-temperature heat storage medium pumps in the heat release system have been triggered and the operation feedback signals have not been triggered, after a preset delay time, interlock to stop the operation of the expansion generator and the cryogenic pumps and the circulating fans in the chilled water storage system;

[0129] (4) When all the shutdown feedback signals of the cryogenic pumps in the chilled water storage system have been triggered and the operation feedback signals have not been triggered, after a preset delay time, interlock to stop the operation of the expansion generator and the circulating fans in the chilled water storage system, and at the same time, interlock to close the isolation valves of the high-temperature heat storage medium pumps in the heat release system leading to the intermediate reheaters at all levels and interlock to open the recirculation regulating valve. After a preset delay time, interlock to stop the operation of the high-temperature heat storage medium pumps or manually stop them by the operator;

[0130] (5) When all the shutdown feedback signals of the circulating fans in the chilled water storage system have been triggered and the operation feedback signals have not been triggered, after a preset delay time, interlock to stop the operation of the expansion generator and the cryogenic pumps in the chilled water storage system, and at the same time, interlock to close the isolation valves of the high-temperature heat storage medium pumps in the heat release system leading to the intermediate reheaters at all levels and interlock to open the recirculation regulating valve. After a preset delay time, interlock to stop the operation of the high-temperature heat storage medium pumps or manually stop them by the operator;

[0131] (6) If all the shutdown feedback signals of the circulating cooling water pumps in the circulating cooling water system have been triggered and the operation feedback signals have not been triggered, after a preset time delay, the expansion generator, the cryogenic pumps and the circulating fans in the cold energy storage system, and the high-temperature heat storage medium pumps in the heat release system are interlocked and shut down.

[0132] To further illustrate this solution, the protection control strategy in the embodiments of this application may include:

[0133] (I) Protection control strategy for the main unit of the expansion generator:

[0134] (1) If all of the following conditions are met, the expansion generator is allowed to be unblocked and started:

[0135] 1) All the conditions of the thermal measurement points are met: including the measurement points of temperature, pressure, flow rate, rotational speed, axial displacement, differential expansion, eccentricity, vibration, liquid level, load, etc. related to the expansion power generation system, as well as the feedback non-fault points of related valves (such as open, closed, valve position feedback, etc.) and equipment speed regulating devices (such as the scoop tube valve position of the hydraulic coupling, the frequency of the frequency converter, etc.);

[0136] 2) The input feedback signals of high-voltage electricity, low-voltage electricity, electrical protection devices, electrical cabinets, grid connection cabinets, etc. have been triggered and the removal feedback signals have not been triggered;

[0137] 3) The operation feedback signal of the air compressor in the instrument / plant use compressed air system has been triggered and the shutdown feedback signal has not been triggered. At the same time, the pressure of the air supply main pipe in the instrument / plant use compressed air system reaches the preset normal pressure value (such as 0.75 MPa.a);

[0138] 4) CPD1 ≤ preset normal differential pressure value (such as 50 kPa); 5) CPD2 ≤ preset normal differential pressure value (such as 40 kPa); 6) CPD3 ≤ preset normal differential pressure value (such as 30 kPa); 7) CPD4 ≤ preset normal differential pressure value (such as 20 kPa);

[0139] 8) CPD5 ≤ preset normal differential pressure value (such as 50 kPa); 9) CPD6 ≤ preset normal differential pressure value (such as 50 kPa);

[0140] 10) CP1-1 ≥ preset normal pressure value (such as 9.5 MPa.a); 11) CP12 ≥ preset normal pressure value (such as 8.5 MPa.a); 12) (CP9~CP11) 2 out of 3 ≥ preset normal pressure value (such as 0.2 MPa.a);

[0141] 13) The operation feedback signal of the circulating cooling water pump in the circulating cooling water system has been triggered and the shutdown feedback signal has not been triggered. At the same time, CP13 ≥ preset normal pressure value (such as 0.6 MPa.a);

[0142] 14) CT9 ≥ preset low temperature value 1 (e.g., 25 °C); 15) CT11 to CT13 ≤ preset normal temperature value (e.g., 60 °C); 16) CT14 to CT15 ≤ preset normal temperature value (e.g., 50 °C);

[0143] 17) CT16 to CT21 ≤ preset normal temperature value (e.g., 60 °C);

[0144] 18) CT24 to CT31 ≤ preset normal temperature value (e.g., 60 °C);

[0145] 19) CT32 to CT35 ≤ preset normal temperature value (e.g., 55 °C);

[0146] 20) CV1x / CV1y to CV12x / CV12y ≤ preset normal amplitude value (e.g., 20 μm);

[0147] 21) The flow rate CF1 of the instrument / factory compressed air system for supplying the expansion generator shaft seal isolation gas ≥ preset normal flow rate value (e.g., 20 Nm 3 / h);

[0148] 22) CF3 ≥ preset normal flow rate value (e.g., 20 t / h);

[0149] 23) CL1 ≥ preset normal liquid level value (e.g., 260 mm);

[0150] 24) Preset low shaft displacement value 1 (e.g., -0.4 mm) ≤ CZ1 ≤ preset high shaft displacement value 1 (e.g., +0.4 mm);

[0151] 25) Preset low shaft displacement value 1 (e.g., -0.5 mm) ≤ CZ2 ≤ preset high shaft displacement value 1 (e.g., +0.5 mm);

[0152] 26) The operator manually resets the expansion generator shutdown interlock.

[0153] (2) Alarm conditions triggered by the overlimit of the expansion generator body parameters:

[0154] 1) 2 out of 3 of (CS1 to CS3) ≥ preset high speed value 1 (e.g., 41000 rpm) triggers an alarm;

[0155] 2) 2 out of 3 of (CS4 to CS6) ≥ preset high speed value 1 (e.g., 28700 rpm) triggers an alarm;

[0156] 3) CPD1 ≥ preset high differential pressure value 1 (e.g., 70 kPa) triggers an alarm;

[0157] 4) CPD2 ≥ preset high differential pressure value 1 (e.g., 60 kPa) triggers an alarm;

[0158] 5) When CPD3 ≥ preset differential pressure high value 1 (such as 50 kPa), an alarm is triggered;

[0159] 6) When CPD4 ≥ preset differential pressure high value 1 (such as 40 kPa), an alarm is triggered;

[0160] 7) When CPD5 ≥ preset differential pressure high value 1 (such as 70 kPa), an alarm is triggered;

[0161] 8) When CPD6 ≥ preset differential pressure high value 1 (such as 100 kPa), an alarm is triggered;

[0162] 9) When CP1 - 1 ≤ preset pressure low value 1 (such as 9 MPa.a), an alarm is triggered;

[0163] 10) When (CP9~CP11) 2 out of 3 ≤ preset pressure low value 2 (such as 0.15 MPa.g), an alarm is triggered;

[0164] 11) When CP12 ≤ preset pressure low value 1 (such as 6 MPa.a), an alarm is triggered;

[0165] 12) When CP13 ≤ preset pressure low value 1 (such as 0.5 MPa.a), an alarm is triggered;

[0166] 13) When CT9 ≤ preset temperature low value 2 (such as 15℃), an alarm is triggered;

[0167] 14) When any one of CT11~CT13 ≥ preset temperature high value 1 (such as 125℃), an alarm is triggered;

[0168] 15) When any one of CT14~CT15 ≥ preset temperature high value 1 (such as 80℃), an alarm is triggered;

[0169] 16) When any one of CT16~CT21 ≥ preset temperature high value 1 (such as 90℃), an alarm is triggered;

[0170] 17) When any one of CT24~CT31 ≥ preset temperature high value 1 (such as 90℃), an alarm is triggered;

[0171] 18) When any one of CT32~CT35 ≥ preset temperature high value 1 (such as 85℃), an alarm is triggered;

[0172] 19) When any one of CV1x~CV12x ≥ preset amplitude high value 1 (such as 38μm), an alarm is triggered;

[0173] 20) When any one of CV1y~CV12y ≥ preset amplitude high value 1 (such as 38μm), an alarm is triggered;

[0174] 21) When CF1 ≤ preset flow rate low value 1 (such as 18 Nm 3 / h), an alarm is triggered;

[0175] 22) When CF3 ≤ the preset low flow value 1 (such as 18 t / h), an alarm is triggered;

[0176] 23) When CL1 ≤ the preset low liquid level value 1 (such as 133 mm), an alarm is triggered;

[0177] 24) When CZ1 ≤ the preset low shaft displacement value 2 (such as -0.8 mm) or CZ1 ≥ the preset high shaft displacement value 2 (such as +0.8 mm), an alarm is triggered;

[0178] 25) When CZ2 ≤ the preset low shaft displacement value 2 (such as -0.9 mm) or CZ2 ≥ the preset high shaft displacement value 2 (such as +0.9 mm), an alarm is triggered.

[0179] (3) Alarm and interlock shutdown conditions triggered by the overlimit of the parameters of the expansion generator body:

[0180] 1) 2 out of 3 of (CS1~CS3) ≥ the preset high speed value 2 (such as 42000 rpm);

[0181] 2) 2 out of 3 of (CS4~CS6) ≥ the preset high speed value 2 (such as 29400 rpm);

[0182] 3) 2 out of 3 of (CP9~CP11) ≤ the preset low pressure value 4 (such as 0.12 MPa.g);

[0183] 4) CP12 ≤ the preset low pressure value 2 (such as 3 MPa.a);

[0184] 5) CP13 ≤ the preset low pressure value 2 (such as 0.4 MPa.a);

[0185] 6) CT9 ≤ the preset low temperature value 3 (such as 5℃);

[0186] 7) Any one of CT11~CT13 ≥ the preset high temperature value 2 (such as 145℃);

[0187] 8) Any one of CT14~CT15 ≥ the preset high temperature value 2 (such as 90℃);

[0188] 9) Any one of CT16~CT21 ≥ the preset high temperature value 2 (such as 95℃);

[0189] 10) Any one of CT24~CT31 ≥ the preset high temperature value 2 (such as 95℃);

[0190] 11) Any one of CT32~CT35 ≥ the preset high temperature value 2 (such as 90℃);

[0191] 12) CV1x or CV1y ≥ the preset high amplitude value 2 (such as 48 μm) and CV2x or CV2y ≥ the preset high amplitude value 2 (such as 48 μm);

[0192] 13) CV3x or CV3y ≥ preset high amplitude value 2 (such as 48 μm) and CV4x or CV4y ≥ preset high amplitude value 2 (such as 48 μm);

[0193] 14) CV5x or CV5y ≥ preset high amplitude value 2 (such as 48 μm) and CV6x or CV6y ≥ preset high amplitude value 2 (such as 48 μm);

[0194] 15) CV7x or CV7y ≥ preset high amplitude value 2 (such as 48 μm) and CV8x or CV8y ≥ preset high amplitude value 2 (such as 48 μm);

[0195] 16) CV9x or CV9y ≥ preset high amplitude value 2 (such as 48 μm) and CV10x or CV10y ≥ preset high amplitude value 2 (such as 48 μm);

[0196] 17) CV11x or CV11y ≥ preset high amplitude value 2 (such as 48 μm) and CV12x or CV12y ≥ preset high amplitude value 2 (such as 48 μm);

[0197] 18) CF1 ≤ preset low flow value 2 (such as 15 Nm 3 / h);

[0198] 19) CF3 ≤ preset low flow value 2 (such as 17 t / h);

[0199] 20) CL1 ≤ preset low liquid level value 2 (such as 50 mm);

[0200] 21) CZ1 ≤ preset low shaft displacement value 3 (such as -1 mm) or CZ1 ≥ preset high shaft displacement value 3 (such as +1 mm);

[0201] 22) CZ2 ≤ preset low shaft displacement value 3 (such as -1.2 mm) or CZ2 ≥ preset high shaft displacement value 3 (such as +1.2 mm);

[0202] 23) The PLC / DCS system outputs a shutdown or fault signal;

[0203] 24) The grid connection cabinet outputs a shutdown or fault signal;

[0204] 25) The front panel or local emergency stop button triggers a shutdown.

[0205] After any of the above conditions is triggered, the PLC / DCS system sends an alarm interlock shutdown signal to the unit, and interlocks to close 1-1, 1-2, and 1-3, interlocks to open 1-10, and interlocks to start the AC lubricating oil pump. At the same time, the generator outlet circuit breaker trips and keeps the unit in a shutdown state, unable to be restarted by reclosing. Only when all the above alarm values are reset and the operating personnel analyze and confirm the cause of the shutdown and then manually reset the shutdown interlock can the unit be restarted by reclosing, avoiding the automatic startup of the unit after all the above alarm values are reset.

[0206] (2) Lubricating oil auxiliary system control and protection strategy:

[0207] (1) Interlock to stop the electric heater in the lubricating oil tank when any of the following conditions is met:

[0208] 1) Manually stop the electric heater;

[0209] 2) When CT9 ≥ preset high temperature value (such as 35°C), interlock to stop the electric heater.

[0210] (2) Interlock to start the electric heater in the lubricating oil tank when any of the following conditions is met:

[0211] 1) Manually start the electric heater;

[0212] 2) When CL1 ≥ preset high liquid level value (such as 140 mm) and CT9 ≤ preset low temperature value 1 (such as 25°C), interlock to start the electric heater.

[0213] (3) Starting permission conditions for the AC lubricating oil pump: CP12 ≥ preset low pressure value 2 (such as 3 MPa.a) and CT9 ≥ preset low temperature value 2 (such as 15°C).

[0214] (4) Interlock to stop the AC lubricating oil pump when any of the following conditions is met:

[0215] 1) Manually stop the AC lubricating oil pump;

[0216] 2) When (CP9~CP11) 2 out of 3 ≥ preset high pressure value (such as 0.4 MPa.g), interlock to stop the AC lubricating oil pump;

[0217] 3) When CP12 ≤ preset low pressure value 3 (such as 1 MPa.a), the expansion generator shutdown feedback signal has been triggered and the operation feedback signal has not been triggered, and after a preset time delay (such as 30 seconds), interlock to stop the AC lubricating oil pump.

[0218] (5) Interlock to start the AC lubricating oil pump when any of the following conditions is met:

[0219] 1) Manually start the AC lubricating oil pump;

[0220] 2) The expansion generator triggers the alarm interlock shutdown condition;

[0221] 3) If two out of three of (CP9~CP11) ≤ preset low pressure value 1 (such as 0.155 MPa.g), interlock to start the AC lubricating oil pump;

[0222] 4) When two out of three of (CS7~CS9) ≤ preset low speed value 1 (such as 2950 rpm), interlock to start the AC lubricating oil pump.

[0223] (6) Interlock to start the DC lubricating oil pump when any of the following conditions is met:

[0224] 1) Two out of three of (CP9~CP11) ≤ preset low pressure value 3 (such as 0.13 MPa.g);

[0225] 2) When two out of three of (CS7~CS9) ≤ preset low speed value 1 (such as 2950 rpm) and after a preset delay time (such as 2 s), the stop feedback signal of the AC lubricating oil pump has been triggered and the running feedback signal has not been triggered, interlock to start the DC lubricating oil pump;

[0226] 3) When the expansion generator triggers the alarm interlock shutdown condition and after a preset delay time (such as 2 s), the stop feedback signal of the AC lubricating oil pump has been triggered and the running feedback signal has not been triggered, interlock to start the DC lubricating oil pump.

[0227] (7) Automatic control:

[0228] 1) For 1 - 11, put into the temperature automatic control of CT23 (the automatic tracking value can refer to 40℃);

[0229] 2) For 1 - 12, put into the pressure automatic control of taking the average of three out of (CP9~CP11) (the automatic tracking value can refer to 0.2 MPa.g).

[0230] (3) Automatic regulation settings for the seal gas, isolation gas, and bypass of the air expander:

[0231] (1) Automatic regulation settings for the seal gas:

[0232] 1) For 1 - 4, put into the pressure automatic control of CP12 (the automatic tracking value can refer to 8.5 MPa.a);

[0233] 2) For 1 - 5, put into the pressure automatic control (the automatic tracking value can refer to the real - time value of CP1 - 2 minus the offset, and the offset can be set to 0.5 MPa);

[0234] 3) For 1 - 6, put into the pressure automatic control (the automatic tracking value can refer to the real - time value of CP3 minus the offset, and the offset can be set to 0.2 MPa);

[0235] 4) For 1 - 7, put into the pressure automatic control (the automatic tracking value can refer to the real - time value of CP5 minus the offset, and the offset can be set to 0.1 MPa);

[0236] 5) Automatic control of the 1-8 injection pressure (the automatic tracking value can refer to the real-time value of CP7 minus the offset, and the offset can be set to 0.05 MPa).

[0237] (2) Automatic regulation setting of the isolating gas: Automatic control of the flow rate of CF1 injected at 1-9 (the automatic tracking value can refer to 20 Nm 3 / h).

[0238] (3) Automatic regulation setting of the bypass: Automatic control of the pressure of CP0 injected at 1-10 (the automatic tracking value is a fixed value such as 2 MPa before the expansion generator is connected to the grid, and is a curve that changes with the load after the expansion generator is connected to the grid).

[0239] (4) Major interlock shutdown conditions between the expansion generator and other equipment:

[0240] (1) The liquid level height of the low-temperature liquid storage tank in the cold storage system ≤ the preset low liquid level value (such as 200 mm), interlock shuts down the expansion generator, interlock shuts down the cryogenic pump and circulation fan in the cold storage system, and at the same time interlock closes the isolation valve of the high-temperature heat storage medium pump in the heat release system leading to the inter-stage reheater and interlock opens the recirculation regulating valve. After a preset time delay (such as 10 min), interlock shuts down the high-temperature heat storage medium pump or manually shuts it down by the operator;

[0241] (2) The expansion generator shutdown feedback signal has been triggered and the operation feedback signal has not been triggered. Interlock shuts down the cryogenic pump and circulation fan in the cold storage system, and at the same time interlock closes the isolation valve of the high-temperature heat storage medium pump in the heat release system leading to the inter-stage reheater and interlock opens the recirculation regulating valve. After a preset time delay (such as 10 min), interlock shuts down the high-temperature heat storage medium pump or manually shuts it down by the operator;

[0242] (3) All the shutdown feedback signals of the high-temperature heat storage medium pumps in the heat release system have been triggered and the operation feedback signal has not been triggered. After a preset time delay (such as 5 s), interlock shuts down the expansion generator and the cryogenic pump and circulation fan in the cold storage system;

[0243] (4) All the shutdown feedback signals of the cryogenic pumps in the cold storage system have been triggered and the operation feedback signal has not been triggered. After a preset time delay (such as 5 s), interlock shuts down the expansion generator and the circulation fan in the cold storage system. At the same time, interlock closes the isolation valve of the high-temperature heat storage medium pump in the heat release system leading to the inter-stage reheater and interlock opens the recirculation regulating valve. After a preset time delay (such as 10 min), interlock shuts down the high-temperature heat storage medium pump or manually shuts it down by the operator;

[0244] (5) When the shutdown feedback signals of all circulating fans in the cold storage system are triggered and the operation feedback signals are not triggered, after a preset delay time (such as 5 s), the expansion generator and the cryogenic pumps in the cold storage system are interlocked to stop operation. At the same time, the isolation valves of the high-temperature heat storage medium pumps in the heat release system leading to the inter-stage reheaters are interlocked to close and the recirculation regulating valves are interlocked to open. After a preset delay time (such as 10 min), the high-temperature heat storage medium pumps are interlocked to stop operation or manually stopped by the operator.

[0245] (6) When the shutdown feedback signals of all circulating cooling water pumps in the circulating cooling water system are triggered and the operation feedback signals are not triggered, after a preset delay time (such as 5 s), the expansion generator, the cryogenic pumps and the circulating fans in the cold storage system, and the high-temperature heat storage medium pumps in the heat release system are interlocked to stop operation.

[0246] In this application, specific embodiments are used to elaborate on the principles and implementation manners of the application. The descriptions of the above embodiments are only used to help understand the method and its core idea of the application. At the same time, for those of ordinary skill in the art, according to the idea of the application, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the application.

Claims

1. A protection control device for compression control of an expansion power generation system of an energy storage power station, characterized in that: include: A control module, a plurality of measuring points and valves arranged on the compression control energy storage power station; the control module is respectively connected to each of the measuring points and valves for communication; The control module is used to obtain the measurement data of each of the measuring points, monitor the feedback signals of multiple devices in the compression-controlled energy storage power station, apply a preset protection control strategy based on the measurement data of each of the measuring points and the feedback signals of each of the devices, control the valve, and complete the protection control of the expansion power generation system in the compression-controlled energy storage power station. The equipment includes: an electrical protection device, an electrical cabinet, a circulating cooling water system, an expansion generator, a heat release system, a cold storage system, each of the measuring points and a valve.

2. The protection and control device for compression control of expansion power generation system of energy storage power station according to claim 1, characterized in that: The multiple measuring points set on the compression control energy storage power station include: Differential pressure measuring points are respectively set at the air expander shaft seal self-sealing mother pipe, oil filter and air expander inlet filter screens at all levels, air pressure measuring points are set at the outlet of the evaporator in the cold storage system, pressure measuring points are respectively set before the emergency shut-off valve at the inlet of the first-level air expander, after the inlet regulating valve of the first-level air expander, the water supply mother pipe of the circulating cooling water system, the outlet of each level of air expanders, and the inlet of the 2nd to 4th level air expanders, the oil supply pressure measuring point is set at the lubricating oil mother pipe, and the air supply pressure measuring point is set at the air expander shaft seal self-sealing mother pipe. The air temperature measuring point is set at the outlet of the evaporator in the cold storage system, and the temperature measuring points are set at the generator coil, the generator support bearing, the inlet of each level of air expander, the outlet of each level of air expander, the high-speed shaft support bearing of the reduction gearbox, the main shaft support bearing after the reduction gearbox speed reduction, the low-speed shaft support bearing of the reduction gearbox, the support bearing of each level of air expander, the high-speed shaft thrust bearing and the low-speed shaft thrust bearing. The air supply temperature measuring point is set at the self-sealing of the air expander shaft seal, the lubricating oil temperature measuring point is set at the outlet of the oil cooler, the oil temperature measuring point is set at the lubricating oil tank, and the return oil temperature measuring point is set at the lubricating oil. X / Y axial vibration measuring points are respectively set at the support bearings of the high-speed shaft of the reduction gearbox and the support bearings of the low-speed shaft of the reduction gearbox, vibration measuring points are respectively set at the support bearings of air expanders at each level, isolation air flow measuring points are set at the shaft seal of the air expander supplied by the instrument / factory compressed air system, lubricating oil return flow measuring points are set at the lubricating oil tank, flow measuring points are set at the circulating cooling water return main pipe, liquid level measuring points are set at the lubricating oil tank, axial displacement measuring points are respectively set at the high-speed shaft and low-speed shaft, speed measuring points are respectively set at the high-speed shaft and low-speed shaft, and speed measuring points are set at the generator.

3. The protection and control device for compression control of expansion power generation system of energy storage power station according to claim 1, characterized in that: The valve comprises: An emergency shut-off valve is provided at the inlet of the first-stage air expander; a first regulating valve is provided at the inlet of the first-stage air expander; a second regulating valve is provided at the exhaust of the 4th-stage air expander to the air compression system; an air supply pressure regulating valve is provided at the self-sealing main pipe of the air expander shaft seal; self-sealing air supply pressure regulating valves are provided at each stage of the air expander respectively; an isolation air flow regulating valve is provided at the air expander shaft seal of the instrument / factory compressed air system; a third regulating valve is provided at the bypass of the expansion generator; a lubricating oil temperature regulating valve is provided at the outlet of the oil cooler; and a lubricating oil pressure regulating valve is provided at the outlet of the oil filter.

4. The protection control device for compression control of expansion power generation system of energy storage power station according to claim 1, characterized in that: The control module is used to obtain first measurement data, monitor the feedback signal of the first device in the compression control energy storage power station, and control the emergency shut-off valve set at the inlet of the first-level air expander, the first regulating valve set at the inlet of the first-level air expander, the second regulating valve set at the exhaust of the 4-level air expander to the air compression system, and the third regulating valve set at the bypass of the expansion generator according to the first measurement data, the feedback signal of the first device and the expansion generator control protection strategy, so as to complete the control and protection of the expansion generator of the expansion power generation system; The first measurement data includes: differential pressure measuring points respectively set at the air expander shaft seal self-sealing mother pipe, the oil filter and the inlet filter screens of each stage of the air expander, pressure measuring points respectively set in front of the emergency shut-off valve of the first stage air expander inlet and at the water supply mother pipe of the circulating cooling water system, air supply pressure measuring points set at the air expander shaft seal self-sealing mother pipe, oil supply pressure measuring points set at the lubricating oil mother pipe, temperature measuring points respectively set at the generator coil, generator support bearing, reduction gearbox support bearing, air expander support bearings of each stage, high-speed shaft thrust bearing and low-speed shaft thrust bearing, oil temperature measuring points set at the lubricating oil tank, and oil temperature measuring points set at the reduction gearbox. The X / Y axial vibration measuring points at the high-speed shaft support bearing of the speed box and the low-speed shaft support bearing of the speed reducer, the vibration measuring points respectively set at the support bearings of air expanders at each level, the isolation gas flow measuring points set at the shaft seal of the air expander supplied by the compressed air system for the instrument / factory, the flow measuring points set at the circulating cooling water return main pipe, the liquid level measuring points set at the lubricating oil tank, the shaft displacement measuring points respectively set at the high-speed shaft and the low-speed shaft, the speed measuring points respectively set at the high-speed shaft and the low-speed shaft, and the speed measuring points set at the generator to collect measurement data; the first equipment includes: an electrical protection device, an electrical cabinet, a circulating cooling water system, each of the measuring points and valves.

5. The protection and control device for compression control of expansion power generation system of energy storage power station according to claim 1, characterized in that: The control module is used to obtain second measurement data, and control the lubricating oil temperature regulating valve provided at the outlet of the oil cooler and the lubricating oil pressure regulating valve provided at the outlet of the oil filter according to the second measurement data and the control and protection strategy of the lubricating oil auxiliary system, so as to complete the control and protection of the lubricating oil auxiliary system of the expansion power generation system; Among them, the second measurement data includes: measurement data collected by an oil temperature measurement point set at the lubricating oil tank, a liquid level measurement point set at the lubricating oil tank, an air supply pressure measurement point set at the air expander shaft seal self-sealing mother pipe, an oil supply pressure measurement point set at the lubricating oil mother pipe, a speed measurement point set at the generator, and a lubricating oil temperature measurement point set at the outlet of the oil cooler.

6. The protection control device for compression control of expansion power generation system of energy storage power station according to claim 1, characterized in that: The control module is used to obtain the third measurement data, and according to the third measurement data and the air expander bypass control and protection strategy, control the air supply pressure regulating valve provided at the air expander shaft seal self-sealing mother pipe, the self-sealing air supply pressure regulating valve provided at each level of air expanders, the isolation gas flow regulating valve provided at the air expander shaft seal of the instrument / factory compressed air system, and the third regulating valve provided at the expansion generator bypass, so as to complete the control and protection of the air expander sealing gas, isolation gas and bypass of the expansion power generation system; Among them, the third measurement data includes: the air supply pressure measuring point set at the self-sealing main pipe of the air expander shaft seal, the pressure measuring point set at the inlet of the 2nd to 4th level air expander after the 1st level air expander inlet regulating valve, the isolation air flow measuring point set at the air expander shaft seal of the instrument / factory compressed air system, and the measurement data collected by the air temperature measuring point set at the evaporator outlet in the cold storage system.

7. The protection control device for compression control of expansion power generation system of energy storage power station according to claim 4, characterized in that: The method controls the emergency shut-off valve provided at the inlet of the first-stage air expander, the first regulating valve provided at the inlet of the first-stage air expander, the second regulating valve provided at the exhaust air compression system of the fourth-stage air expander, and the third regulating valve provided at the bypass of the expansion generator according to the first measurement data, the feedback signal of the first device, and the expansion generator control protection strategy, so as to complete the control protection of the expansion generator of the expansion power generation system, including: Based on the first measurement data and the feedback signal of the first device, if the expansion generator meets each condition in the first condition group, the expansion generator is triggered to allow the start-up; if the expansion generator meets at least one condition in the second condition group, an alarm is triggered; if the expansion generator meets each condition in the third condition group, an alarm interlock shutdown is triggered; When at least one of triggering the expansion generator to allow the start-up, triggering the alarm and triggering the alarm interlock shutdown is triggered, an alarm interlock shutdown signal is sent to the expansion generator, and the emergency shut-off valve, the first regulating valve, the second regulating valve are interlocked to close, the third regulating valve is interlocked to open, and the AC lubricating oil pump is interlocked to start, and at the same time, the expansion generator outlet circuit breaker is opened and the expansion generator is kept in a shutdown state.

8. The protection and control device for compression control of an expansion power generation system of an energy storage power station according to claim 5, characterized in that: The method of controlling the lubricating oil temperature regulating valve disposed at the outlet of the oil cooler and the lubricating oil pressure regulating valve disposed at the outlet of the oil filter according to the second measurement data and the control and protection strategy of the lubricating oil auxiliary system to complete the control and protection of the lubricating oil auxiliary system of the expansion power generation system includes: Based on the second measurement data, if the electric heater is manually stopped or the oil temperature in the lubricating oil tank is greater than or equal to a preset high temperature value, the electric heater in the lubricating oil tank is interlocked and stopped; If the lubricating oil auxiliary system meets at least one condition in the fourth condition group, the electric heater in the lubricating oil tank is started interlocked, and the fourth condition group includes: a condition of manually starting the electric heater, a condition that the lubricating oil tank liquid level ≥ a preset liquid level high value and a lubricating oil tank oil temperature ≤ a preset temperature low value; If the air expander shaft seal self-sealing main pipe air supply pressure ≥ preset pressure lower than 2 values ​​and the lubricating oil tank oil temperature ≥ preset temperature lower than 2 values, start the AC lubricating oil pump; If the lubricating oil auxiliary system meets at least one condition in the fifth condition group, the AC lubricating oil pump is interlocked and shut down, and the conditions in the fifth condition group include: manual shutdown of the AC lubricating oil pump condition; at least two of the lubricating oil main pipe supply pressures at multiple measuring points are ≥ the preset pressure high value condition; the air expander shaft seal self-sealing main pipe supply pressure ≤ the preset pressure low 3 value, and at the same time the expansion generator shutdown feedback signal has been triggered and the operation feedback signal has not been triggered; If the lubricating oil auxiliary system meets at least one condition in the sixth condition group, the AC lubricating oil pump is started by interlock, and the conditions in the sixth condition group include: the condition of manually starting the AC lubricating oil pump; the condition of the expansion generator triggering an alarm interlock shutdown; the condition that at least two of the lubricating oil main pipe supply pressures at multiple measuring points are ≤ the fourth preset pressure lower value 1; the condition that at least two of the generator speeds at multiple measuring points are ≤ the preset speed lower value 1; Controlling the lubricating oil temperature regulating valve to automatically control the lubricating oil temperature at the oil cooler outlet; The lubricating oil pressure regulating valve is controlled to automatically control the oil supply pressure of the lubricating oil main pipe.

9. The protection control device for compression control of expansion power generation system of energy storage power station according to claim 6, characterized in that: According to the third measurement data and the air expander bypass control and protection strategy, the air supply pressure regulating valve arranged at the air expander shaft seal self-sealing mother pipe, the self-sealing air supply pressure regulating valve arranged at each level of air expanders, the isolation gas flow regulating valve arranged at the air expander shaft seal of the instrument / plant compressed air system, and the third regulating valve arranged at the expansion generator bypass are controlled to complete the control and protection of the air expander sealing gas, isolation gas and bypass of the expansion power generation system, including: Control the pressure of the air supply pressure regulating valve to automatically control the air supply pressure of the air expander shaft seal self-sealing mother pipe; According to the real-time value of the pressure after the inlet regulating valve of each level of air expander minus the offset, the self-sealing air supply pressure regulating valve at the air expander of that level is controlled to automatically control the pressure; Control the isolation gas flow regulating valve to automatically control the flow of the isolation gas flow supplied to the air expander shaft seal of the instrument / plant compressed air system; The third regulating valve is controlled to automatically control the pressure of the air pressure at the evaporator outlet in the cold storage system.

10. The protection and control device for compression control of an expansion power generation system of an energy storage power station according to claim 1, characterized in that: The control module is used for: Determine whether the liquid level of the low-temperature liquid storage tank in the cold storage system is less than or equal to the preset low liquid level. If so, the expansion generator is shut down by interlock, the cryogenic pump and the circulating fan in the cold storage system are shut down by interlock, the isolation valve of the high-temperature heat storage medium pump in the heat release system leading to the inter-stage reheater is closed by interlock, and the recirculation regulating valve is opened by interlock. After the preset time, the high-temperature heat storage medium pump is shut down by interlock; Monitor the expansion generator shutdown feedback signal and operation feedback signal. If the expansion generator shutdown feedback signal has been triggered and the operation feedback signal has not been triggered, the cryogenic pump and the circulating fan in the cold storage system are shut down by interlock, the isolation valve of the high-temperature heat storage medium pump in the heat release system leading to the inter-stage reheater is closed by interlock, and the recirculation regulating valve is opened by interlock. After the preset time, the high-temperature heat storage medium pump is shut down by interlock; Monitor the shutdown feedback signals and operation feedback signals of all high-temperature heat storage medium pumps in the heat release system. If the shutdown feedback signals of all high-temperature heat storage medium pumps in the heat release system have been triggered and the operation feedback signals have not been triggered, then after a preset time, interlock and shut down the expansion generator, the cryogenic pump and the circulating fan in the cold storage system; Monitor the shutdown feedback signals and operation feedback signals of all cryogenic pumps in the cold storage system. If the shutdown feedback signals of all cryogenic pumps in the cold storage system have been triggered and the operation feedback signals have not been triggered, then after the preset time, the expansion generator and the circulation fan in the cold storage system will be shut down by interlock, the isolation valve of the high-temperature heat storage medium pump in the heat release system leading to the inter-stage reheater will be closed by interlock, the recirculation regulating valve will be opened by interlock, and after the preset time, the high-temperature heat storage medium pump will be shut down by interlock; Monitor the shutdown feedback signals and operation feedback signals of all circulating fans in the cold storage system. If the shutdown feedback signals of all circulating fans in the cold storage system have been triggered and the operation feedback signals have not been triggered, then after the preset time, the expansion generator and the cryogenic pump in the cold storage system will be shut down interlocked, the isolation valve of the high-temperature heat storage medium pump in the heat release system leading to the inter-stage reheater will be closed interlocked, the recirculation regulating valve will be opened interlocked, and after the preset time, the high-temperature heat storage medium pump will be shut down interlocked; Monitor the shutdown feedback signals and operation feedback signals of all circulating cooling water pumps in the circulating cooling water system. If the shutdown feedback signals of all circulating cooling water pumps in the circulating cooling water system have been triggered and the operation feedback signals have not been triggered, then after the preset time, the expansion generator, the cryogenic pump and circulating fan in the cold storage system and the high-temperature heat storage medium pump in the heat release system will be interlocked and shut down.

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