A hierarchical control method and device for supercritical carbon dioxide power generation device

Abstract

The present application discloses a hierarchical control method and apparatus for a supercritical carbon dioxide power generation device, the method comprising: charging carbon dioxide working fluid into a circulation pipeline loop of the supercritical carbon dioxide power generation device, and entering a startup phase when startup conditions are met; performing hierarchical control based on a speed parameter of the supercritical carbon dioxide power generation device and a proportional relationship between the working fluid flow rate and an established working fluid circulation loop; and switching a motor from a motor control mode to a generator control mode when the speed parameter and power parameter of the supercritical carbon dioxide power generation device meet power generation conditions. The present invention causes the supercritical carbon dioxide power generation device to enter a startup phase when startup conditions are met after the carbon dioxide working fluid is charged, and sets multi-level control conditions so that the supercritical carbon dioxide power generation device is hierarchically controlled to gradually reach power generation conditions. Through step-by-step control, both supercritical state stability and rapid maneuverability of the supercritical carbon dioxide power generation device startup process are taken into account.

Description

Technical Field

[0001] The present application relates to the technical field of power generation device control, and more specifically, to a hierarchical control method and device for a supercritical carbon dioxide power generation device. Background Art

[0002] At present, supercritical carbon dioxide power generation equipment is a new type of power generation system with significant advantages such as high thermoelectric conversion efficiency, small size of power equipment and system, simple and compact structure, and good flexibility. It is an emerging power generation technology with great potential in the fields of nuclear power generation, solar power generation, geothermal power generation, fossil fuel power generation, waste heat utilization and ship power.

[0003] Existing control methods for supercritical carbon dioxide cycle power generation devices mainly include bypass control methods and pressure control methods; among them, the bypass control method is specifically: a bypass pipeline and a bypass valve are set between the turbine and the heat source, and a pressure regulating valve is set at the compressor inlet to adjust the output power of the supercritical carbon dioxide cycle power generation device and the compressor inlet pressure respectively; the bypass control method can ensure that the system operates stably under various load fluctuations and has high reliability; however, during the load adjustment process, a large amount of high-temperature carbon dioxide gas working fluid that is bypassed does not perform work, thereby greatly reducing the system's thermoelectric conversion efficiency.

[0004] However, the control method startup process of the supercritical carbon dioxide cycle power generation device in the existing technology involves the control switching between the electric mode and the power generation mode. The operation control logic of each stage is determined based on manual experience. The control parameter debugging process is complicated, and it is difficult to simultaneously take into account the supercritical state stability and rapid maneuverability of the supercritical carbon dioxide power generation device startup process. Summary of the Invention

[0005] In response to at least one defect or improvement need in the prior art, the present invention provides a hierarchical control method and equipment for a supercritical carbon dioxide power generation device, which is used to solve the problem that the control method in the prior art needs to determine the debugging of control parameters based on manual experience when starting the supercritical carbon dioxide circulation power generation device, and it is difficult to simultaneously take into account the supercritical state stability and rapid maneuverability of the supercritical carbon dioxide power generation device during the startup process.

[0006] To achieve the above objectives, according to a first aspect of the present invention, a hierarchical control method for a supercritical carbon dioxide power generation device is provided, comprising:

[0007] Filling the circulating pipeline loop of the supercritical carbon dioxide power generation device with carbon dioxide working fluid and entering the startup phase when the startup conditions are met;

[0008] Based on the speed parameters of the supercritical carbon dioxide power generation device and the established working fluid circulation loop, the proportional relationship of the working fluid flow rate is adjusted to perform hierarchical control;

[0009] When the speed parameters and power parameters of the supercritical carbon dioxide power generation device reach the power generation conditions, the motor is switched from the motor control mode to the generator control mode.

[0010] In one possible implementation, the supercritical carbon dioxide power generation device is charged with carbon dioxide as a working medium in a circulation pipeline loop, and a startup phase is entered when startup conditions are met, including:

[0011] Setting startup conditions based on historical startup data of supercritical carbon dioxide power generation units;

[0012] After cleaning the circulating pipeline loop, fill it with carbon dioxide working medium;

[0013] When the circulation pipeline loop parameters reach the starting conditions, the supercritical carbon dioxide power generation device is started.

[0014] In one possible implementation, the startup conditions are set based on historical startup data of the supercritical carbon dioxide power generation device, including:

[0015] Analyze historical startup data to determine the initial values ​​of working fluid pressure and working fluid temperature;

[0016] The working fluid pressure threshold value and the working fluid temperature threshold value are determined by superimposing an adaptive function on the basis of the initial value of the working fluid pressure and the initial value of the working fluid temperature;

[0017] The starting condition is that the lowest pressure value and the lowest temperature value of the working fluid in the circulation pipeline loop reach the working fluid pressure threshold value and the working fluid temperature threshold value.

[0018] In one possible implementation, hierarchical control is performed based on the speed parameter of the supercritical carbon dioxide power generation device and the proportional relationship of the working fluid flow rate adjusted in the established working fluid circulation loop, including:

[0019] When the speed parameter reaches a first preset speed value, the working fluid flow rate ratio is adjusted to the first preset ratio through the working fluid circulation loop and the heat source is started;

[0020] When the speed parameter reaches the stage condition of graded control, the structure of the working medium circulation loop is adjusted to enable the supercritical carbon dioxide power generation device to enter the corresponding graded control stage.

[0021] In one possible implementation, when the speed parameter reaches a stage condition of graded control, the structure of the working fluid circulation loop is adjusted so that the supercritical carbon dioxide power generation device enters a corresponding graded control stage, including:

[0022] When the speed parameter reaches the second speed preset value, the structure of the working medium circulation loop is adjusted so that the ratio of the working medium flow rate reaches the second preset ratio, so that the supercritical carbon dioxide power generation device enters the first level control stage.

[0023] In one possible implementation, when the speed parameter reaches a stage condition of graded control, adjusting the structure of the working fluid circulation loop so that the supercritical carbon dioxide power generation device enters a corresponding graded control stage further includes:

[0024] When the speed parameter reaches the third speed preset value, the structure of the working medium circulation loop is adjusted so that the ratio of the working medium flow rate reaches the third preset ratio, so that the supercritical carbon dioxide power generation device enters the second level control stage.

[0025] In a possible implementation, when the proportional relationship between the speed parameter and the working fluid flow rate reaches the third stage condition, the supercritical carbon dioxide power generation device enters the third stage of control, further comprising:

[0026] When the speed parameter reaches the fourth speed preset value, the structure of the working medium circulation loop is adjusted so that the ratio of the working medium flow rate reaches the fourth preset ratio, so that the supercritical carbon dioxide power generation device enters the third level control stage.

[0027] In one possible implementation, the power parameters include compressor power and turbine power; when the speed parameters and power parameters of the supercritical carbon dioxide power generation device meet power generation conditions, switching the motor from a motor control mode to a generator control mode includes:

[0028] The power generation condition is that the speed parameter reaches the fifth speed preset value, and at the same time the compressor power is greater than the turbine power and the difference between the compressor power and the turbine power is not greater than the preset difference;

[0029] The drive motor is switched from motor control mode to generator control mode, and the structure of the working fluid circulation loop is adjusted so that the speed parameter reaches the rated speed.

[0030] According to a second aspect of the present invention, a hierarchical control device for a supercritical carbon dioxide power generation device is also provided, which includes at least one processing unit and at least one storage unit, wherein the storage unit stores a computer program, and when the computer program is executed by the processing unit, the processing unit performs the steps of any of the above-mentioned hierarchical control methods for a supercritical carbon dioxide power generation device.

[0031] According to the third aspect of the present invention, a storage medium is also provided, which stores a computer program that can be executed by an access authentication device. When the computer program is run on the access authentication device, the access authentication device executes any step of the hierarchical control method for a supercritical carbon dioxide power generation device described above.

[0032] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0033] The present invention provides a hierarchical control method for a supercritical carbon dioxide power generation device. When the startup conditions are met after the carbon dioxide working medium is filled, the supercritical carbon dioxide power generation device enters a startup phase. Multi-stage control conditions are set for the supercritical carbon dioxide power generation device, so that the supercritical carbon dioxide power generation device can be hierarchically controlled to gradually meet the set power generation conditions. The supercritical carbon dioxide power generation device is then started to perform power generation operations. There is no need to manually determine the debugging of control parameters through experience. Automatic switching of the working mode of the supercritical carbon dioxide power generation device can be achieved through pre-setting. Moreover, since the supercritical carbon dioxide power generation device is controlled step by step, the power generation process of the supercritical carbon dioxide power generation device is relatively smooth, thereby achieving the effect of taking into account both supercritical state stability and rapid maneuverability during the startup process of the supercritical carbon dioxide power generation device. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0035] Figure 1 A schematic flow chart of an embodiment of a hierarchical control method for a supercritical carbon dioxide power generation device provided by the present invention;

[0036] Figure 2 A schematic structural diagram of an embodiment of a supercritical carbon dioxide power generation device provided by the present invention;

[0037] Figure 3 The present invention provides Figure 1 A flow chart of an embodiment of step S100;

[0038] Figure 4 The present invention provides Figure 3 A flow chart of an embodiment of step S110;

[0039] Figure 5 A schematic structural diagram of a hierarchical control device for a supercritical carbon dioxide power generation device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0040] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0041] The terms "first," "second," "third," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish between different objects, not to describe a particular order. Furthermore, the terms "including," "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or elements is not limited to the listed steps or elements, but may optionally include steps or elements not listed, or may optionally include other steps or elements inherent to the process, method, product, or apparatus.

[0042] The present invention provides a hierarchical control method and device for a supercritical carbon dioxide power generation device, which are described below.

[0043] See also Figure 1 , Figure 1 This is a flow chart of an embodiment of a hierarchical control method for a supercritical carbon dioxide power generation device provided by the present invention. In a specific embodiment of the present invention, a hierarchical control method for a supercritical carbon dioxide power generation device is disclosed, comprising:

[0044] S100, charging the circulating pipe loop of the supercritical carbon dioxide power generation device with carbon dioxide as the working medium, and entering the startup phase when the startup conditions are met;

[0045] S200, adjusting the proportional relationship of the working fluid flow rate based on the speed parameter of the supercritical carbon dioxide power generation device and the established working fluid circulation loop to perform hierarchical control;

[0046] S300: When the speed parameter and power parameter of the supercritical carbon dioxide power generation device reach the power generation condition, the motor is switched from the motor control mode to the generator control mode.

[0047] In the above embodiment, the hierarchical control method for a supercritical carbon dioxide power generation device provided by the present invention not only includes a supercritical carbon dioxide power generation device, but also needs to include a parameter acquisition device and a control cabinet. It can be understood that the parameter acquisition device is mainly used to collect various parameters of the supercritical carbon dioxide power generation device during operation, such as the integrated unit speed, compressor inlet pressure, compressor inlet temperature, compressor outlet temperature, compressor outlet pressure, compressor working fluid flow, compressor power, turbine inlet temperature, turbine inlet pressure, turbine outlet temperature, turbine outlet pressure, turbine working fluid flow, turbine power and other key operating parameters, and the parameter acquisition device is generally a collection of multiple sensors, which can be designed through existing technology, and the present invention will not go into details about this.

[0048] The data collected by the parameter acquisition device is transmitted to the processing unit in the control cabinet for analysis to determine whether the parameter threshold conditions of each stage are met. If so, it enters the next control stage. If not, it continues to adjust the control parameters of this stage. The control cabinet can also automatically adjust the operating parameters of each component in the supercritical carbon dioxide power generation device according to the preset automatic control logic or real-time operation data to ensure the supercritical state stability and rapid maneuverability of the supercritical carbon dioxide power generation device in each stage of the startup process. In addition, during the startup process, the control cabinet can monitor abnormal conditions of the supercritical carbon dioxide power generation device, such as speed exceeding the limit, temperature being too high, pressure abnormality, etc., issue pop-up alarm information prompts, and automatically trigger safety protection mechanisms when necessary, such as speed reduction, shutdown, alarm, etc.

[0049] See also Figure 2 , Figure 2 This is a schematic diagram of the structure of one embodiment of the supercritical carbon dioxide power generation device provided by the present invention. The supercritical carbon dioxide power generation device in this embodiment primarily comprises a heat source 1, a compressor 2, a motor 3, a turbine 4, a cooler 5, a regenerator 6, a regulating valve 7, a bypass valve 8, and other equipment. The compressor 2, turbine 4, and motor 3 are coaxial, forming an integrated unit. Heat source 1 heats the carbon dioxide working fluid, which then enters turbine 4 to generate electricity. The exhaust gas after this work is cooled by the low-temperature side fluid of regenerator 6 and then cooled by cooler 5 to the required compressor 2 inlet temperature. The exhaust gas then enters compressor 2 for compression and pressure increase, and is then reheated in regenerator 6, forming a closed loop.

[0050] This embodiment automatically divides the entire startup process of the supercritical carbon dioxide power generation device from cold start to power operation into a pre-start phase, a unit start phase, a speed increase phase, a warm-up phase, a power increase phase, a speed and power increase phase, and a power operation phase based on the changing characteristics of key operating parameters throughout the startup process of the supercritical carbon dioxide power generation device. Control targets and control logic are formulated for each phase, and after determining that the key operating parameters meet the threshold conditions of each phase, hierarchical control is automatically performed in sequence.

[0051] Compared with the prior art, the present embodiment provides a hierarchical control method for a supercritical carbon dioxide power generation device. When the startup conditions are met after the carbon dioxide working fluid is filled, the supercritical carbon dioxide power generation device enters the startup phase. Multi-level control conditions are set for the supercritical carbon dioxide power generation device, so that the supercritical carbon dioxide power generation device can be hierarchically controlled to gradually reach the set power generation conditions. The supercritical carbon dioxide power generation device is then started to perform power generation operations. There is no need to manually determine the debugging of control parameters through experience. Automatic switching of the working mode of the supercritical carbon dioxide power generation device can be achieved through prior settings. Moreover, since the supercritical carbon dioxide power generation device is controlled step by step, the power generation process of the supercritical carbon dioxide power generation device is relatively smooth, thereby achieving the effect of taking into account both supercritical state stability and rapid maneuverability during the startup process of the supercritical carbon dioxide power generation device.

[0052] See also Figure 3 , Figure 3 The present invention provides Figure 1 FIG. 1 is a flow chart of an embodiment of step S100 in FIG. 1 . In some embodiments of the present invention, the supercritical carbon dioxide power generation device is charged with carbon dioxide as a working medium in a circulation pipeline loop, and a startup phase is entered when startup conditions are met, including:

[0053] S110, setting startup conditions according to historical startup data of the supercritical carbon dioxide power generation device;

[0054] S120, after cleaning the circulation pipeline loop, fill it with carbon dioxide working medium;

[0055] S130: When the circulation pipeline loop parameters reach the start-up conditions, the supercritical carbon dioxide power generation device is started.

[0056] In the above embodiment, step S100 is the pre-startup phase. When setting the startup conditions, detailed data from all previous successful startups of the supercritical CO2 power generation device must be collected and analyzed, including but not limited to key parameters such as temperature, pressure, flow rate, and speed during startup. Based on this historical data analysis, a reasonable range of startup conditions is then set. These conditions should ensure that the supercritical CO2 power generation device quickly reaches a stable operating state during startup while avoiding equipment damage or safety accidents caused by improper parameter settings. Finally, when setting the startup conditions, a certain safety margin should be considered to account for possible deviations or fluctuations during actual operation.

[0057] In a specific embodiment of the present invention, the control cabinet is used to purge air and other impurities from the circulating loop, including impurities, moisture, oxygen, and other substances that may affect the performance of the working fluid and the safety of the equipment. The purge time is no less than 15 minutes. After the impurity removal is completed, the pipeline loop should be inspected for cleanliness to ensure that the specified cleanliness standards are met. Specialized filling equipment is used to charge supercritical carbon dioxide into the circulating pipeline loop in accordance with operating procedures. During the filling process, the filling speed, temperature, and pressure must be strictly controlled to ensure the safety and efficiency of the filling process, and all working fluid pressure and temperature parameters in the circulating pipeline loop must be monitored in real time.

[0058] Once all parameters have been confirmed to meet startup requirements, a final pre-startup check is performed to confirm that all components of the supercritical CO2 power generation unit are functioning properly. The supercritical CO2 power generation unit is gradually started up according to the pre-determined startup procedure. During startup, close attention must be paid to the unit's operating status and changes in various parameters to ensure a smooth transition to normal operation. After startup, necessary commissioning and optimization are performed as needed to improve power generation efficiency and operational stability.

[0059] See also Figure 4 , Figure 4 The present invention provides Figure 3 FIG. 1 is a flow chart of an embodiment of step S110 in FIG. 1 . In some embodiments of the present invention, setting the startup conditions based on historical startup data of the supercritical carbon dioxide power generation device includes:

[0060] S111. Analyze historical startup data to determine initial values ​​of working fluid pressure and working fluid temperature;

[0061] S112, superimposing an adaptive function on the basis of the initial value of the working fluid pressure and the initial value of the working fluid temperature to determine a working fluid pressure threshold and a working fluid temperature threshold;

[0062] S113. The starting condition is that the lowest pressure value and the lowest temperature value of the working fluid in the circulation pipeline loop reach the working fluid pressure threshold value and the working fluid temperature threshold value.

[0063] In the above embodiment, data on the working fluid pressure and temperature during each successful startup of the supercritical CO2 power generation device is collected. Statistical analysis of this data is performed to determine common initial values ​​or average values ​​for the working fluid pressure and temperature during the startup process. These values ​​reflect the basic conditions required for the supercritical CO2 power generation device during initial startup. Based on the data analysis results, initial values ​​for the working fluid pressure and temperature are set, which serve as the basis for setting startup conditions.

[0064] Select an appropriate adaptive function that dynamically adjusts the working fluid pressure and temperature thresholds based on historical data trends, environmental factors (such as ambient temperature and humidity), or device status (such as wear and tear and maintenance history). Using the initial working fluid pressure and temperature values ​​as input, the adaptive function calculates the working fluid pressure and temperature thresholds. These thresholds should be higher than the initial values ​​to ensure sufficient margin to cope with possible fluctuations or deviations during the device startup process. Verify the rationality and effectiveness of the thresholds through simulation tests or actual trial runs. Based on the verification results, make necessary adjustments and optimizations to the adaptive function to determine the correct working fluid pressure and temperature thresholds.

[0065] During the startup process of the supercritical CO2 power generation unit, the working fluid pressure and temperature within the circulation pipeline loop are continuously monitored, with particular attention paid to changes in their minimum values. When the minimum working fluid pressure and temperature within the circulation pipeline loop simultaneously reach or exceed the previously set working fluid pressure and working fluid temperature thresholds, the unit is deemed to have met the startup conditions. Once these conditions are met, the supercritical CO2 power generation unit is gradually started according to the predetermined startup procedure, entering the unit startup phase. The control cabinet automatically sends commands to turbine 4 bypass valve 8 and turbine 4 regulating valve 7, opening turbine 4 bypass valve 8 and closing turbine 4 regulating valve 7 to form a turbine 4 bypass loop. Motor 3 operates in electric motor control mode, and the variable frequency drive control device of motor 3 drives compressor 2 and turbine 4 to start and increase their speed to 30% of the rated speed, maintaining stable operation at this speed. During the startup process, the working fluid pressure and temperature must be closely monitored, and necessary adjustments and optimizations must be made based on actual conditions.

[0066] In some embodiments of the present invention, hierarchical control is performed based on the speed parameter of the supercritical carbon dioxide power generation device and the proportional relationship of the working fluid flow rate of the established working fluid circulation loop, including:

[0067] When the speed parameter reaches a first preset speed value, the working medium flow rate ratio is adjusted to the first preset ratio through the working medium circulation loop and the heat source 1 is started;

[0068] When the speed parameter reaches the stage condition of graded control, the structure of the working medium circulation loop is adjusted to enable the supercritical carbon dioxide power generation device to enter the corresponding graded control stage.

[0069] In the above embodiment, when the speed parameter reaches the first speed preset value, the supercritical carbon dioxide power generation device enters the speed-up stage. At this time, the motor 3 of the supercritical carbon dioxide power generation device operates in the motor control mode. As a preferred embodiment, the first speed preset value is that the speed of the integrated unit is increased to 35% of the rated speed and maintained at this speed value for stable operation. At this time, the control cabinet automatically sends instructions to the turbine 4 bypass valve 8 and the turbine 4 regulating valve 7 to open the turbine 4 regulating valve 7 and adjust the turbine 4 working fluid flow to ensure that the turbine 4 working fluid flow and the compressor 2 working fluid flow reach a first preset ratio (40% in the preferred embodiment of the present invention). Then, the heat source 1 is started through the control cabinet and the heating power is slowly increased to ensure that the turbine 4 inlet temperature meets the operating requirements.

[0070] In some embodiments of the present invention, when the speed parameter reaches the stage condition of graded control, the structure of the working medium circulation loop is adjusted so that the supercritical carbon dioxide power generation device enters the corresponding graded control stage, including:

[0071] When the speed parameter reaches the second speed preset value, the structure of the working medium circulation loop is adjusted so that the ratio of the working medium flow rate reaches the second preset ratio, so that the supercritical carbon dioxide power generation device enters the first level control stage.

[0072] In the above embodiment, when the speed parameter reaches the second speed preset value, the supercritical carbon dioxide power generation device enters the warm-up stage, and the motor 3 operates in the motor control mode. As a preferred embodiment, the second speed preset value is that the speed of the integrated unit is increased to 75% of the rated speed and maintained at this speed value for stable operation. At this time, the control cabinet automatically sends instructions to the turbine 4 bypass valve 8 and the turbine 4 regulating valve 7 to reduce the opening of the turbine 4 bypass valve 8 and increase the opening of the turbine 4 regulating valve 7, increase the turbine 4 working fluid flow, adjust the turbine 4 working fluid flow and the compressor 2 working fluid flow to a second preset ratio (80% in the preferred embodiment of the present invention), and automatically increase the power of the heat source 1 to ensure that the inlet temperature of the turbine 4 in the warm-up stage is the same as the inlet temperature of the turbine 4 in the speed-up stage.

[0073] In some embodiments of the present invention, when the speed parameter reaches the stage condition of graded control, adjusting the structure of the working medium circulation loop so that the supercritical carbon dioxide power generation device enters the corresponding graded control stage further includes:

[0074] When the speed parameter reaches the third speed preset value, the structure of the working medium circulation loop is adjusted so that the ratio of the working medium flow rate reaches the third preset ratio, so that the supercritical carbon dioxide power generation device enters the second level control stage.

[0075] In the above embodiment, when the speed parameter reaches the third speed preset value, the supercritical carbon dioxide power generation device enters the power increase stage, and the motor 3 operates in the motor control mode. As a preferred embodiment, the third speed preset value is that the speed of the integrated unit is stably operated at 75% of the rated speed. At this time, the control cabinet automatically sends instructions to the turbine 4 bypass valve 8 and the turbine 4 regulating valve 7 to increase the opening of the turbine 4 bypass valve 8, reduce the opening of the turbine 4 regulating valve 7, reduce the turbine 4 working fluid flow rate, and adjust the ratio of the turbine 4 working fluid flow rate to the compressor 2 working fluid flow rate to the third preset ratio (65% in the preferred embodiment of the present invention). The power of the heat source 1 is automatically increased, and the inlet temperature of the turbine 4 in the power increase stage is increased to about 150% of the inlet temperature of the turbine 4 in the warm-up stage.

[0076] In some embodiments of the present invention, when the ratio between the speed parameter and the working fluid flow rate reaches the third stage condition, the supercritical carbon dioxide power generation device enters the third stage of control, further comprising:

[0077] When the speed parameter reaches the fourth speed preset value, the structure of the working medium circulation loop is adjusted so that the ratio of the working medium flow rate reaches the fourth preset ratio, so that the supercritical carbon dioxide power generation device enters the third level control stage.

[0078] In the above embodiment, when the speed parameter reaches the fourth speed preset value, the supercritical carbon dioxide power generation device enters the speed and power increase stage, and the motor 3 operates in the motor control mode. As a preferred embodiment, the fourth speed preset value is that the speed of the integrated unit is stably operated at 75% of the rated speed. At this time, the control cabinet automatically sends instructions to the turbine 4 bypass valve 8 and the turbine 4 regulating valve 7 to reduce the opening of the turbine 4 bypass valve 8, increase the opening of the turbine 4 regulating valve 7, increase the turbine 4 working fluid flow, and adjust the ratio of the turbine 4 working fluid flow to the compressor 2 working fluid flow to the third preset ratio (90% in the preferred embodiment of the present invention).

[0079] In some embodiments of the present invention, the power parameters include compressor power and turbine power; when the speed parameters and power parameters of the supercritical carbon dioxide power generation device meet the power generation conditions, the motor 3 is switched from the motor control mode to the generator control mode, including:

[0080] The power generation condition is that the speed parameter reaches the fifth speed preset value, and at the same time the compressor power is greater than the turbine power and the difference between the compressor power and the turbine power is not greater than the preset difference;

[0081] The driving motor 3 is switched from the motor control mode to the generator control mode, and the structure of the working medium circulation loop is adjusted so that the speed parameter reaches the rated speed.

[0082] In the above embodiment, the compressor power and turbine power are monitored in real time, and the switching logic between the motor control mode and the generator control mode is designed (i.e., switching to the power generation condition). As a preferred embodiment, the fifth speed preset value is that the speed of the integrated unit is stably operating at 75% of the rated speed, and at the same time, the compressor power is greater than the turbine power, and the difference is not greater than 3kW, then the switching condition of the motor 3 control mode is met, the driving of the motor 3 is stopped, the load resistance of the motor 3 is cut in, the motor control mode is switched to the generator control mode, the turbine 4 drives the motor 3 and the compressor 2 to rotate and do work, and then the power of the heat source 1 is automatically increased to ensure that the inlet temperature of the turbine 4 in the speed and power increase stage is the same as the inlet temperature of the turbine 4 in the power increase stage.

[0083] Afterwards, the supercritical carbon dioxide power generation device enters the power operation stage, the motor 3 operates in the generator control mode, the turbine 4 drives the motor 3 and the compressor 2 to rotate and do work, and automatically sends instructions to the turbine 4 bypass valve 8 and the turbine 4 regulating valve 7 through the control cabinet to reduce the opening of the turbine 4 bypass valve 8, increase the opening of the turbine 4 regulating valve 7, and increase the turbine 4 working fluid flow. At this time, the speed of the integrated unit is automatically increased to 100% of the rated speed and maintained at this speed value for stable operation. At the same time, the power of the heat source 1 is automatically reduced to ensure that the inlet temperature of the turbine 4 in the power operation stage is the same as the inlet temperature of the turbine 4 in the speed and power increase stage.

[0084] See also Figure 5 , Figure 5 A schematic diagram of the structure of a hierarchical control device for a supercritical carbon dioxide power generation device provided in an embodiment of the present invention. Based on the aforementioned hierarchical control method for a supercritical carbon dioxide power generation device, the present invention also provides a hierarchical control device for a supercritical carbon dioxide power generation device. The hierarchical control device for a supercritical carbon dioxide power generation device can be a computing device such as a mobile terminal, desktop computer, notebook, PDA, or server. The hierarchical control device 500 for a supercritical carbon dioxide power generation device includes a processor 510, a memory 520, and a display 530. Figure 5 Only some components of the synchronous tracking flying welding equipment for real-time measurement of battery height are shown, but it should be understood that it is not required to implement all the shown components, and more or fewer components may be implemented instead.

[0085] In some embodiments, the memory 520 may be an internal storage unit of the hierarchical control device 500 for a supercritical carbon dioxide power generation system, such as a hard drive or memory within the hierarchical control device 500. In other embodiments, the memory 520 may be an external storage device within the hierarchical control device 500 for a supercritical carbon dioxide power generation system, such as a plug-in hard drive, a Smart Media Card (SMC), a Secure Digital (SD) card, a flash memory card, or the like. Furthermore, the memory 520 may include both an internal storage unit and an external storage device within the hierarchical control device 500 for a supercritical carbon dioxide power generation system. The memory 520 is used to store application software and various data installed within the hierarchical control device 500 for a supercritical carbon dioxide power generation system, such as program code installed within the hierarchical control device 500 for a supercritical carbon dioxide power generation system. The memory 520 may also be used to temporarily store data that has been output or is about to be output. In one embodiment, a hierarchical control program 540 for a supercritical carbon dioxide power generation device is stored in the memory 520. The hierarchical control program 540 for a supercritical carbon dioxide power generation device can be executed by the processor 510, thereby realizing the hierarchical control method for a supercritical carbon dioxide power generation device in each embodiment of the present application.

[0086] In some embodiments, the processor 510 can be a central processing unit (CPU), a microprocessor, or other data processing chip, used to run program codes or process data stored in the memory 520, such as executing a hierarchical control method for a supercritical carbon dioxide power generation device.

[0087] In some embodiments, the display 530 can be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, or an OLED (Organic Light-Emitting Diode) touchscreen. The display 530 is used to display information on the hierarchical control device 500 for a supercritical carbon dioxide power generation device and to display a visual user interface. The components 510-530 of the hierarchical control device 500 for a supercritical carbon dioxide power generation device communicate with each other via a system bus.

[0088] In one embodiment, when the processor 510 executes the hierarchical control program 540 for a supercritical carbon dioxide power generation device in the memory 520 , the steps in the above-mentioned hierarchical control method for a supercritical carbon dioxide power generation device are implemented.

[0089] This embodiment further provides a computer-readable storage medium storing a hierarchical control program for a supercritical carbon dioxide power generation device. When the hierarchical control program for a supercritical carbon dioxide power generation device is executed by a processor, the following steps are implemented:

[0090] Filling the circulating pipeline loop of the supercritical carbon dioxide power generation device with carbon dioxide working fluid and entering the startup phase when the startup conditions are met;

[0091] Based on the speed parameters of the supercritical carbon dioxide power generation device and the established working fluid circulation loop, the proportional relationship of the working fluid flow rate is adjusted to perform hierarchical control;

[0092] When the speed parameters and power parameters of the supercritical carbon dioxide power generation device reach the power generation conditions, the motor is switched from the motor control mode to the generator control mode.

[0093] In summary, the present invention provides a hierarchical control method for a supercritical carbon dioxide power generation device, which enables the supercritical carbon dioxide power generation device to enter the startup stage when the startup conditions are met after the carbon dioxide working fluid is filled, and sets multi-level control conditions for the supercritical carbon dioxide power generation device, so that the supercritical carbon dioxide power generation device can be hierarchically controlled to gradually reach the set power generation conditions, and then the supercritical carbon dioxide power generation device is started to perform power generation operation. There is no need to determine the debugging of control parameters through manual experience. The working mode of the supercritical carbon dioxide power generation device can be automatically switched through prior settings. Moreover, since the supercritical carbon dioxide power generation device is controlled step by step, the process of power generation by the supercritical carbon dioxide power generation device is relatively smooth, thereby achieving the effect of taking into account the supercritical state stability and rapid maneuverability of the startup process of the supercritical carbon dioxide power generation device.

[0094] The present application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the above method. The computer-readable storage medium may include, but is not limited to, any type of disk, including a floppy disk, an optical disk, a DVD, a CD-ROM, a microdrive, a magneto-optical disk, a ROM, a RAM, an EPROM, an EEPROM, a DRAM, a VRAM, a flash memory device, a magnetic card or an optical card, a nanosystem (including a molecular memory IC), or any type of medium or device suitable for storing instructions and / or data.

[0095] It should be noted that for the aforementioned method embodiments, for the sake of simplicity, they are all expressed as a series of action combinations, but those skilled in the art should be aware that this application is not limited by the order of the actions described, because according to this application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by this application.

[0096] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0097] In the several embodiments provided in this application, it should be understood that the disclosed devices can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some service interface, and the indirect coupling or communication connection of the device or unit can be electrical or other forms.

[0098] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0099] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0100] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable memory. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a memory and includes a number of instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned memory includes: U disk, read-only memory (ROM), random access memory (RAM), mobile hard disk, magnetic disk, or optical disk, etc., various media that can store program code.

[0101] Those skilled in the art will appreciate that all or part of the steps in the various methods of the above embodiments can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable memory, which may include: a flash drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc.

[0102] The above is only an exemplary embodiment of the present disclosure and cannot be used to limit the scope of the present disclosure. That is, any equivalent changes and modifications made according to the teachings of the present disclosure are still within the scope of the present disclosure. After considering the specification and practicing the disclosure herein, those skilled in the art will easily think of the implementation scheme of the present disclosure. This application is intended to cover any variation, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary technical means in the art that are not recorded in the present disclosure. The description and examples are to be regarded as exemplary only, and the scope and spirit of the present disclosure are defined by the claims.

[0103] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0104] It will be easily understood by those skilled in the art that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A hierarchical control method for a supercritical carbon dioxide power generation device, characterized in that: include: Filling the circulating pipeline loop of the supercritical carbon dioxide power generation device with carbon dioxide working fluid and entering the startup phase when the startup conditions are met; Based on the speed parameters of the supercritical carbon dioxide power generation device and the established working fluid circulation loop, the proportional relationship of the working fluid flow rate is adjusted to perform hierarchical control; When the speed parameters and power parameters of the supercritical carbon dioxide power generation device reach the power generation conditions, the motor is switched from the motor control mode to the generator control mode; The hierarchical control based on the proportional relationship of the working fluid flow rate adjusted by the speed parameter of the supercritical carbon dioxide power generation device and the established working fluid circulation loop includes: When the speed parameter reaches a first preset speed value, the ratio of the working medium flow rate is adjusted to a first preset ratio through the working medium circulation loop and the heat source is started; When the speed parameter reaches the stage condition of graded control, the structure of the working medium circulation loop is adjusted so that the supercritical carbon dioxide power generation device enters the corresponding graded control stage; When the speed parameter reaches the stage condition of graded control, adjusting the structure of the working medium circulation loop so that the supercritical carbon dioxide power generation device enters the corresponding graded control stage includes: When the speed parameter reaches a second preset speed value, the structure of the working medium circulation loop is adjusted so that the ratio of the working medium flow rate reaches a second preset ratio, so that the supercritical carbon dioxide power generation device enters the first level control stage.

2. The hierarchical control method for a supercritical carbon dioxide power generation device according to claim 1, characterized in that: The step of filling the circulating pipe loop of the supercritical carbon dioxide power generation device with carbon dioxide as the working medium and entering the startup phase when the startup conditions are met includes: Setting startup conditions based on historical startup data of supercritical carbon dioxide power generation units; After removing impurities from the circulation pipeline loop, the circulating pipeline is filled with carbon dioxide as a working medium; When the circulation pipeline loop parameters reach the start-up conditions, the supercritical carbon dioxide power generation device is started.

3. The hierarchical control method for a supercritical carbon dioxide power generation device according to claim 2, characterized in that: The step of setting the startup conditions according to the historical startup data of the supercritical carbon dioxide power generation device includes: Analyzing the historical startup data to determine an initial value of the working fluid pressure and an initial value of the working fluid temperature; Determine a working fluid pressure threshold and a working fluid temperature threshold by superimposing an adaptive function on the basis of the working fluid pressure initial value and the working fluid temperature initial value; The starting condition is that the lowest pressure value and the lowest temperature value of the working fluid in the circulation pipeline loop reach the working fluid pressure threshold value and the working fluid temperature threshold value.

4. The hierarchical control method for a supercritical carbon dioxide power generation device according to claim 1, characterized in that: When the speed parameter reaches the stage condition of graded control, adjusting the structure of the working medium circulation loop so that the supercritical carbon dioxide power generation device enters the corresponding graded control stage also includes: When the speed parameter reaches a third preset speed value, the structure of the working medium circulation loop is adjusted so that the ratio of the working medium flow rate reaches a third preset ratio, so that the supercritical carbon dioxide power generation device enters the second level control stage.

5. The hierarchical control method for a supercritical carbon dioxide power generation device according to claim 1, characterized in that: When the proportional relationship between the speed parameter and the working fluid flow rate reaches the third stage condition, the supercritical carbon dioxide power generation device enters the third stage of control, further comprising: When the speed parameter reaches a fourth preset speed value, the structure of the working medium circulation loop is adjusted so that the ratio of the working medium flow rate reaches a fourth preset ratio, so that the supercritical carbon dioxide power generation device enters the third level control stage.

6. The hierarchical control method for a supercritical carbon dioxide power generation device according to claim 1, characterized in that: The power parameters include compressor power and turbine power; when the speed parameters and power parameters of the supercritical carbon dioxide power generation device reach the power generation conditions, switching the motor from the motor control mode to the generator control mode includes: The power generation condition is that the speed parameter reaches a fifth preset speed value, and at the same time, the compressor power is greater than the turbine power and the difference between the compressor power and the turbine power is not greater than a preset difference value; The driving motor is switched from the motor control mode to the generator control mode, and the structure of the working medium circulation loop is adjusted so that the speed parameter reaches the rated speed.

7. A hierarchical control device for a supercritical carbon dioxide power generation device, characterized in that: The method comprises at least one processing unit and at least one storage unit, wherein the storage unit stores a computer program, and when the computer program is executed by the processing unit, the processing unit executes the steps of the hierarchical control method for a supercritical carbon dioxide power generation device according to any one of claims 1 to 6.

8. A storage medium, characterized in that: It stores a computer program that can be executed by an access authentication device. When the computer program is run on the access authentication device, the access authentication device executes the steps of the hierarchical control method for a supercritical carbon dioxide power generation device according to any one of claims 1 to 6.

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