A method and device for heat and power peak regulation coupling control of an ultra-supercritical unit

Abstract

The present application relates to the technical field of heat supply control, and particularly relates to a method and device for coupling control of heat supply and power peak regulation of an ultra-supercritical unit. The method comprises: obtaining energy parameter information of a coupling control system for heat supply and power peak regulation of an ultra-supercritical unit; wherein the energy parameter information comprises current heat supply demand load of a heat supply pipe network, current energy supply load of an ultra-supercritical boiler, current heat storage capacity of a high-temperature molten salt tank, and current energy supply demand load of an electric network; determining a working state of the ultra-supercritical unit based on the energy parameter information; controlling a high-pressure cylinder of an ultra-supercritical steam turbine, the ultra-supercritical boiler, a steam extraction valve group, the high-temperature molten salt tank, and the heat supply pipe network based on the working state; and after a preset time length, re-executing the steps of obtaining the current heat supply demand load of the heat supply pipe network, the current energy supply load of the ultra-supercritical boiler, and the current energy supply demand load of the electric network. In this way, the present application can improve the peak regulation efficiency of the coupling control system for heat supply and power peak regulation of the ultra-supercritical unit.

Description

Technical Field

[0001] This invention relates to the field of heating control technology, and in particular to a method and device for coupled control of heating and power peak shaving of ultra-supercritical units. Background Technology

[0002] Ultra-supercritical units are characterized by high efficiency and low energy consumption, and are widely used in the thermal power sector. The integration of a high proportion of renewable energy into the grid requires thermal power units to have deep peak-shaving capabilities. However, traditional units adopt a "heat-driven power generation" mode during the heating season, with a fixed steam extraction rate that limits the range of power generation adjustment, making it difficult to meet the grid's peak-shaving demands. Furthermore, simply reducing load for peak shaving can easily cause fluctuations in heating parameters, affecting the stability of residential and industrial heating. The existing coupled control systems for heating and power peak shaving in ultra-supercritical units have relatively low peak-shaving efficiency.

[0003] Based on this, the present invention proposes a coupling control method and device for heating and power peak shaving of ultra-supercritical units to solve the above-mentioned technical problems. Summary of the Invention

[0004] This invention describes a method and device for coupled control of heating and power peak shaving in ultra-supercritical units, which can improve the peak shaving efficiency of the coupled control system for heating and power peak shaving in ultra-supercritical units.

[0005] According to a first aspect, the present invention provides a method for coupled control of heating and power peak shaving in an ultra-supercritical unit. The method is applied to a controller of a coupled control system for heating and power peak shaving in an ultra-supercritical unit. The system includes the controller and, in sequence, a low-temperature molten salt tank, a high-temperature molten salt tank, a heating network, a power grid, an extraction valve group, an ultra-supercritical turbine high-pressure cylinder, and an ultra-supercritical boiler. The ultra-supercritical boiler is connected to the low-temperature molten salt tank. The controller is electrically connected to the ultra-supercritical boiler, the turbine high-pressure cylinder, the extraction valve group, the high-temperature molten salt tank, and the heating network, respectively. The method includes: The energy parameter information of the coupled control system for heating and power peak shaving of the ultra-supercritical unit is obtained; wherein the energy parameter information includes the current heating demand load of the heating network, the current energy supply load of the ultra-supercritical boiler, the current heat storage of the high-temperature molten salt tank, and the current energy supply demand load of the power grid. Based on the energy parameter information, the operating status of the ultra-supercritical unit is determined; Based on the aforementioned operating status, the high-pressure cylinder of the ultra-supercritical steam turbine, the ultra-supercritical boiler, the extraction steam valve group, the high-temperature molten salt tank, and the heating network are controlled. After a preset time, the process of "obtaining the current heating demand load of the heating network, the current energy supply load of the ultra-supercritical boiler, and the current energy supply demand load of the power grid" will be executed again.

[0006] According to a second aspect, the present invention provides a coupling control device for heating and power peak shaving of an ultra-supercritical unit. The device is applied to the controller of a coupling control system for heating and power peak shaving of an ultra-supercritical unit. The system includes a controller and, in sequence, a low-temperature molten salt tank, a high-temperature molten salt tank, a heating network, a power grid, an extraction valve group, an ultra-supercritical turbine high-pressure cylinder, and an ultra-supercritical boiler. The ultra-supercritical boiler is connected to the low-temperature molten salt tank. The controller is electrically connected to the ultra-supercritical boiler, the turbine high-pressure cylinder, the extraction valve group, the high-temperature molten salt tank, and the heating network. The device includes: The acquisition unit is configured to acquire energy parameter information of the ultra-supercritical unit's heating and power peak-shaving coupled control system; wherein, the energy parameter information includes the current heating demand load of the heating network, the current energy supply load of the ultra-supercritical boiler, the current heat storage capacity of the high-temperature molten salt tank, and the current energy supply demand load of the power grid. The first data processing unit is configured to determine the operating status of the ultra-supercritical unit based on the energy parameter information. The second data processing unit is configured to control the ultra-supercritical steam turbine high-pressure cylinder, the ultra-supercritical boiler, the extraction valve group, the high-temperature molten salt tank, and the heating network based on the operating status. The third data processing unit is configured to re-execute "obtaining the current heating demand load of the heating network, the current energy supply load of the ultra-supercritical boiler, and the current energy supply demand load of the power grid" after a preset time period.

[0007] Thirdly, embodiments of this specification also provide an electronic device, including a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, it implements the method described in any embodiment of this specification.

[0008] Fourthly, embodiments of this specification also provide a coupling control system for heating and power peak shaving of an ultra-supercritical unit. The system includes a controller and an ultra-supercritical boiler, an ultra-supercritical steam turbine high-pressure cylinder, an extraction valve group, a surface heat exchanger, and a heating network connected in sequence. The controller is connected to the ultra-supercritical boiler, the steam turbine high-pressure cylinder, the extraction valve group, the surface heat exchanger, and the heating network, respectively. The controller is used to execute the methods described in any embodiment of this specification.

[0009] According to the heating and power peak-shaving coupling control method and device for ultra-supercritical units provided by the present invention, the present invention acquires energy parameter information, including the current heating demand load of the heating network, which is determined by temperature sensors (real-time acquisition of supply and return water temperatures) and flow sensors (recording circulating water flow) within the network; the current energy supply load of the ultra-supercritical boiler, reflecting the actual output capacity of the unit's energy supply device; the current heat storage of the high-temperature molten salt tank, which is calculated by collecting data from temperature and level sensors within the tank; and the current energy supply demand load of the power grid, which is received in real-time through an interface with the power grid dispatching system, thus clarifying the target power output that the unit needs to deliver to the power grid. Based on the energy parameter information, the operating state of the ultra-supercritical unit is determined; subsequently, according to the operating state, different control commands are issued to the high-pressure cylinder of the ultra-supercritical steam turbine, the ultra-supercritical boiler, the extraction valve group, the high-temperature molten salt tank, and the heating network, effectively improving the peak-shaving efficiency of the heating and power peak-shaving coupling control system for ultra-supercritical units. To ensure the dynamic adaptability of the control, after each control command is executed, the "acquisition of the current heating demand load of the heating network, the current energy supply load of the ultra-supercritical boiler, and the current energy supply demand load of the power grid" is re-executed. This improves the peak-shaving efficiency of the ultra-supercritical unit heating and power peak-shaving coupling control system, while ensuring the stability of heating parameters and taking into account both power grid flexibility and heating reliability. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 A flowchart illustrating a coupling control method for heating and power peak shaving of an ultra-supercritical unit according to one embodiment is shown. Figure 2 A schematic block diagram of a heating and power peak-shaving coupling control device for an ultra-supercritical unit according to one embodiment is shown. Figure 3 A schematic block diagram of a heating and power peak-shaving coupled control system for an ultra-supercritical unit according to one embodiment is shown. Detailed Implementation

[0012] The solution provided by the present invention will now be described with reference to the accompanying drawings.

[0013] Figure 1A flowchart illustrating a coupled control method for heating and power peak shaving in an ultra-supercritical unit according to one embodiment is shown. It is understood that this method can be executed by any device, equipment, platform, or cluster of devices with computing and processing capabilities. The coupled control method for heating and power peak shaving in an ultra-supercritical unit is applied to the controller of a coupled control system for heating and power peak shaving in an ultra-supercritical unit. The system includes a controller and, in sequence, a cryogenic molten salt tank, a high-temperature molten salt tank, a heating network, a power grid, an extraction valve group, an ultra-supercritical turbine high-pressure cylinder, and an ultra-supercritical boiler. The ultra-supercritical boiler is connected to the cryogenic molten salt tank. The controller is electrically connected to the ultra-supercritical boiler, the turbine high-pressure cylinder, the extraction valve group, the high-temperature molten salt tank, and the heating network, respectively. Figure 1 As shown, the method includes: Step 100: Obtain the energy parameter information of the ultra-supercritical unit's heating and power peak-shaving coupled control system; wherein, the energy parameter information includes the current heating demand load of the heating network, the current energy supply load of the ultra-supercritical boiler, the current heat storage capacity of the high-temperature molten salt tank, and the current energy supply demand load of the power grid. Step 102: Determine the operating status of the ultra-supercritical unit based on energy parameter information; Step 104: Control the high-pressure cylinder of the ultra-supercritical steam turbine, the ultra-supercritical boiler, the extraction valve group, the high-temperature molten salt tank and the heating network based on the working status; Step 106: After a preset time, re-execute "obtain the current heating demand load of the heating network, the current energy supply load of the ultra-supercritical boiler, and the current energy supply demand load of the power grid".

[0014] In this embodiment, energy parameter information is acquired, including the current heating demand load of the heating network, which is determined by temperature sensors (real-time acquisition of supply and return water temperatures) and flow sensors (recording circulating water flow) within the network; the current energy supply load of the ultra-supercritical boiler, reflecting the actual output capacity of the unit's energy supply device; the current heat storage of the high-temperature molten salt tank, calculated by collecting data from temperature and level sensors within the tank; and the current energy supply demand load of the power grid, received in real-time through an interface with the power grid dispatching system, clarifying the target power output that the unit needs to deliver to the grid. Based on the energy parameter information, the operating status of the ultra-supercritical unit is determined. Subsequently, according to the operating status, different control commands are issued to the high-pressure cylinder of the ultra-supercritical turbine, the ultra-supercritical boiler, the extraction valve group, the high-temperature molten salt tank, and the heating network, effectively improving the peak-shaving efficiency of the ultra-supercritical unit's heating and power peak-shaving coupled control system. To ensure the dynamic adaptability of the control, after each control command is executed, the "acquisition of the current heating demand load of the heating network, the current energy supply load of the ultra-supercritical boiler, and the current energy supply demand load of the power grid" is re-executed. This improves the peak-shaving efficiency of the ultra-supercritical unit heating and power peak-shaving coupling control system, while ensuring the stability of heating parameters and taking into account both power grid flexibility and heating reliability.

[0015] In one embodiment of the present invention, determining the operating state of an ultra-supercritical unit based on energy parameter information includes: Determine the total demand load based on the current heating demand load and the current energy demand load; Determine the difference in total demand based on total demand load and current energy supply load; The operating status is determined based on the total demand load, the total demand difference, and the current heat storage.

[0016] In this embodiment, the current heating demand load and the current energy demand load are added together to determine the total demand load. The difference between the total demand load and the current energy demand load is then calculated to determine the total demand difference, which characterizes the total energy gap that the system needs to meet. Next, the operating status is determined by comparing the total demand load, the total demand difference, and the current heat storage.

[0017] In one embodiment of the present invention, the working states include conventional collaborative mode, thermal storage peak shaving mode, thermal release energy replenishment mode, and emergency supply guarantee mode. Based on total demand load, total demand difference, and current heat storage, determine the operating status, including: When the current heat storage is greater than the first preset value and the absolute value of the total demand difference is less than or equal to the first percentage multiplied by the total demand load, the working state is judged to be the normal collaborative mode. When the current heat storage is less than the second preset value and the total demand difference is greater than or equal to the first percentage multiplied by the total demand load, the working state is determined to be heat storage peak shaving mode. When the current heat storage is less than the third preset value and the total demand difference is less than or equal to the first percentage multiplied by the total demand load, the working state is determined to be heat release and energy replenishment mode. When the current heat storage is less than the third preset value and the total demand difference is less than or equal to the second percentage multiplied by the total demand load, the working status is determined to be emergency supply guarantee mode. Among them, the second percentage is greater than the first percentage, the second preset value is greater than the first preset value, and the first preset value is greater than the third preset value.

[0018] In this embodiment, the operating states include conventional collaborative mode, thermal storage peak shaving mode, thermal release energy replenishment mode, and emergency supply guarantee mode. Each mode corresponds to a specific energy supply and demand scenario. When the current heat storage is greater than a first preset value and the absolute value of the total demand difference is less than or equal to the first percentage multiplied by the total demand load, the operating state is determined to be conventional collaborative mode. Among them, "the current heat storage is greater than the first preset value" indicates that the high-temperature molten salt tank has stored enough reserve energy and there is no need to immediately intervene in the system through charging or releasing energy. "The absolute value of the total demand difference is in the low threshold range" indicates that the current energy supply load of the ultra-supercritical boiler has a very small deviation from the total demand for heating and electricity (the first percentage is 5%, that is, the deviation is ≤5% of the total demand load). The supply and demand balance can be achieved by fine-tuning its own parameters without relying on the thermal storage system. Therefore, it is determined to be conventional collaborative mode. When the current heat storage is less than the second preset value and the total demand difference is greater than or equal to the first percentage multiplied by the total demand load, the operating state is determined to be heat storage peak shaving mode. "Current heat storage is less than the second preset value" (e.g., the second preset value is 90% of the rated heat storage capacity) indicates that the molten salt tank still has sufficient space to accommodate excess energy. "Total demand difference ≥ the first percentage × total demand load" means that the boiler's energy supply exceeds the actual system demand (e.g., the difference ≥ 5% of the total demand load). If not addressed, this will result in energy waste and may lead to power generation exceeding grid demand. In this case, it is determined to be heat storage peak shaving mode. By introducing excess steam into the molten salt tank for storage, energy recovery is achieved, and the turbine power generation is reduced, meeting grid peak shaving requirements. The determination of heat release energy supplement mode requires that "current heat storage is greater than the third preset value" and "total demand difference is less than or equal to - the first percentage multiplied by the total demand load". "Current heat storage greater than the third preset value" (e.g., the third preset value is 5% of the rated heat storage capacity) indicates that the molten salt tank still has energy to release and has the capacity to supplement energy. "Total demand difference ≤ -5% of total demand load" means that the boiler's energy supply cannot meet the total demand, resulting in an energy gap (e.g., a sudden increase in grid load or an increase in heating demand). If only the boiler load is increased, parameter fluctuations are likely due to boiler response lag. In this case, the heat release energy supplement mode is determined, where supplementary steam is generated by releasing heat from the molten salt tank to quickly fill the energy gap and ensure heating temperature. The determination of the emergency supply guarantee mode requires that "current heat storage less than the third preset value" and "total demand difference less than or equal to -2% multiplied by total demand load". "Current heat storage is less than the third preset value" indicates that the molten salt tank is nearly exhausted and there is no more energy available for replenishment; "Total demand difference ≤ 2% × total demand load" (e.g., 2% is 10%) indicates an extremely large energy gap, far exceeding the range of normal replenishment (e.g., extreme low temperatures causing a sudden increase in heating demand, or an emergency increase in grid load). If no special measures are taken, it may lead to heating interruption or insufficient power generation. At this time, it is determined to be in emergency supply mode.

[0019] In one embodiment of the present invention, control is performed on the high-pressure cylinder of the ultra-supercritical steam turbine, the ultra-supercritical boiler, the extraction valve group, the high-temperature molten salt tank, and the heating network based on the operating status, including: When the working state is in the normal collaborative mode, the extraction valve group distributes the steam exhaust to the high-pressure cylinder of the steam turbine according to the first preset ratio. When the working state is thermal storage and peak shaving mode, the branch valve of the extraction steam valve group to the low temperature molten salt tank is increased to the first opening degree, and the high pressure cylinder of the ultra-supercritical steam turbine is reduced to the first steam quantity. When the working state is heat release and energy replenishment mode, the high temperature molten salt tank is controlled to supply heat to the ultra-supercritical boiler and heating network. When the operating status is emergency supply mode, the high-pressure cylinder of the ultra-supercritical steam turbine is reduced to the first power generation capacity and a forced load increase command is sent to the ultra-supercritical boiler.

[0020] In this embodiment, different controls are implemented for the ultra-supercritical steam turbine high-pressure cylinder, boiler, extraction valve group, high-temperature molten salt tank, and heating network under different operating conditions: In the conventional coordinated mode, the extraction valve group distributes the exhaust steam from the high-pressure cylinder of the steam turbine according to a first preset ratio, the boiler maintains stable power supply, and the molten salt tank remains on standby. In the thermal storage and peak shaving mode, the opening degree of the branch valve of the extraction valve group leading to the low-temperature molten salt tank is increased to the first opening degree, while the steam intake of the high-pressure cylinder of the steam turbine is reduced to the first steam quantity, thus storing surplus energy through molten salt and ensuring that the power generation matches the grid demand. In the heat release and energy replenishment mode, the high-temperature molten salt tank starts to release heat, and the generated supplementary steam is distributed to the boiler or heating network as needed to quickly fill the energy gap. In the emergency supply guarantee mode, the power generation of the high-pressure cylinder of the steam turbine is reduced to the first power generation capacity to reduce energy consumption, while a forced load increase command is sent to the boiler to prioritize the basic needs of heating and the grid and avoid system instability.

[0021] In one embodiment of the present invention, the first steam quantity is determined by the following formula:

[0022] In the formula, For the first steam quantity, This refers to the steam output of an ultra-supercritical boiler. For the boiler dynamic response coefficient, For the surplus energy that needs to be stored at present, This is the enthalpy correction factor. This is the enthalpy of extraction. This refers to the extraction steam pressure. The extraction steam temperature. This refers to the enthalpy value of low-temperature molten salt. This refers to the temperature of low-temperature molten salt.

[0023] In this embodiment, For the first steam quantity, The steam volume of the ultra-supercritical boiler is directly collected by the boiler's main steam flow sensor. The boiler dynamic response coefficient (correcting for steam production deviation during boiler load changes, with a value range of 0.97-1.0) is used. The larger the load change rate, the smaller the value. For the surplus energy that needs to be stored at present, This is the enthalpy correction factor (to compensate for the error in the extraction steam pressure deviating from the design value, with a value range of 1.0-1.02). This is the enthalpy of extraction. This refers to the extraction steam pressure. The extraction steam temperature. This refers to the enthalpy value of low-temperature molten salt. This refers to the temperature of low-temperature molten salt.

[0024] In one embodiment of the present invention, the first power generation is determined by the following formula:

[0025] In the formula, The first power generation capacity, Minimum power for safe operation of the unit This represents the current energy load supplied by the boiler. This is the boiler variable load efficiency attenuation coefficient. For heating load, To correct heat loss in the heating network, For generator efficiency, This represents the rate of change in power generation.

[0026] In this embodiment, The minimum power required for safe operation of the unit (30% of the rated power). This represents the current energy load supplied by the boiler. The boiler's variable load efficiency attenuation coefficient (range 0.93-0.98). For heating load, For the correction of heat loss in the heating network, the value ranges from 1.02 to 1.05 (the lower the ambient temperature, the larger the value). For generator efficiency, This represents the rate of change in power generation.

[0027] In one embodiment of the present invention, the first opening degree is determined by the following formula:

[0028] In the formula, For the first opening, For the basic valve opening, For the surplus energy that needs to be stored at present, This is the dynamic correction coefficient for thermal storage response. This represents the maximum thermal storage capacity of the thermal storage system. For the efficiency of steam molten salt heat exchangers, This refers to the extraction steam mass flow rate. This represents the maximum permissible opening of the valve. This is the safety margin coefficient.

[0029] In this embodiment, For the first opening, This is the basic valve opening, and the minimum opening (usually 30%) set to avoid insufficient cooling of the low-pressure cylinder of the steam turbine. For the surplus energy that needs to be stored at present, This is the dynamic correction coefficient for thermal storage response, reflecting the hysteresis characteristics of the molten salt thermal storage system (which changes dynamically over time). This represents the maximum thermal storage capacity of the thermal storage system. For the efficiency of steam molten salt heat exchangers, This refers to the extraction steam mass flow rate. This represents the maximum permissible opening of the valve. As a safety margin factor, it is a correction factor for reducing the opening degree when the heat storage is close to the rated value (to avoid the risk of over-storage).

[0030] The foregoing has described specific embodiments of the invention. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps described in the claims may be performed in a different order than that shown in the embodiments and may still achieve the desired results. Furthermore, the processes depicted in the drawings do not necessarily require the specific or sequential order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0031] According to another embodiment, the present invention provides a coupling control device for heating and power peak shaving of ultra-supercritical units. Figure 2 A schematic block diagram of a heating and power peak-shaving coupling control device for an ultra-supercritical unit is shown according to one embodiment. It is understood that this device can be implemented by any device, equipment, platform, or cluster of devices with computing and processing capabilities. The device is applied to the controller of a heating and power peak-shaving coupling control system for an ultra-supercritical unit. The system includes a controller and, in sequence, a cryogenic molten salt tank, a high-temperature molten salt tank, a heating network, a power grid, an extraction valve group, an ultra-supercritical turbine high-pressure cylinder, and an ultra-supercritical boiler. The ultra-supercritical boiler is connected to the cryogenic molten salt tank. The controller is electrically connected to the ultra-supercritical boiler, the turbine high-pressure cylinder, the extraction valve group, the high-temperature molten salt tank, and the heating network, respectively. Figure 2As shown, the device includes: an acquisition unit 200, a first data processing unit 202, a second data processing unit 204, and a third data processing unit 206. The main functions of each component are as follows: The acquisition unit 200 is configured to acquire energy parameter information of the ultra-supercritical unit's heating and power peak-shaving coupled control system; wherein, the energy parameter information includes the current heating demand load of the heating network, the current energy supply load of the ultra-supercritical boiler, the current heat storage capacity of the high-temperature molten salt tank, and the current energy supply demand load of the power grid. The first data processing unit 202 is configured to determine the operating status of the ultra-supercritical unit based on the energy parameter information. The second data processing unit 204 is configured to control the high-pressure cylinder of the ultra-supercritical steam turbine, the ultra-supercritical boiler, the extraction valve group, the high-temperature molten salt tank and the heating network based on the operating status. The third data processing unit 206 is configured to re-execute "acquiring the current heating demand load of the heating network, the current energy supply load of the ultra-supercritical boiler, and the current energy supply demand load of the power grid" after a preset time period.

[0032] In one embodiment of the present invention, the first data processing unit 202 is configured to perform the following operations: Based on the current heating demand load and the current energy demand load, determine the total demand load; The total demand difference is determined based on the total demand load and the current energy supply load; The operating status is determined based on the total demand load, the total demand difference, and the current heat storage.

[0033] In one embodiment of the present invention, the first data processing unit 202 is configured to perform the following operations: When the current heat storage is greater than the first preset value and the absolute value of the total demand difference is less than or equal to the first percentage multiplied by the total demand load, the working state is determined to be the normal collaborative mode. When the current heat storage is less than the second preset value and the total demand difference is greater than or equal to the first percentage multiplied by the total demand load, the working state is determined to be heat storage peak shaving mode. When the current heat storage is less than the third preset value and the total demand difference is less than or equal to the first percentage multiplied by the total demand load, the working state is determined to be heat release and energy replenishment mode. When the current heat storage is less than the third preset value and the total demand difference is less than or equal to the second percentage multiplied by the total demand load, the working state is determined to be emergency supply mode. Wherein, the second percentage is greater than the first percentage, the second preset value is greater than the first preset value, and the first preset value is greater than the third preset value.

[0034] In one embodiment of the present invention, the second data processing unit 204 is configured to perform the following operations: When the working state is the conventional collaborative mode, the extraction valve group allocates steam to the turbine high-pressure cylinder for exhaust according to the first preset ratio; When the working state is the thermal storage and peak shaving mode, the branch valve of the extraction valve group to the low temperature molten salt tank is increased to the first opening degree, and the high pressure cylinder of the ultra-supercritical steam turbine is reduced to the first steam quantity; When the working state is the heat release and energy replenishment mode, the high-temperature molten salt tank is controlled to supply heat to the ultra-supercritical boiler and the heating network. When the operating state is the emergency supply mode, the high-pressure cylinder of the ultra-supercritical steam turbine is reduced to the first power generation capacity and a forced load increase command is sent to the ultra-supercritical boiler.

[0035] In one embodiment of the present invention, the first steam quantity is determined by the following formula:

[0036] In the formula, This is the first steam quantity. This refers to the steam output of an ultra-supercritical boiler. For the boiler dynamic response coefficient, For the surplus energy that needs to be stored at present, This is the enthalpy correction factor. This is the enthalpy of extraction. This refers to the extraction steam pressure. The extraction steam temperature. This refers to the enthalpy value of low-temperature molten salt. This refers to the temperature of low-temperature molten salt.

[0037] In one embodiment of the present invention, the first power generation is determined by the following formula:

[0038] In the formula, The first power generation capacity, Minimum power for safe operation of the unit This represents the current energy load supplied by the boiler. This is the boiler variable load efficiency attenuation coefficient. For heating load, To correct heat loss in the heating network, For generator efficiency, This represents the rate of change in power generation.

[0039] In one embodiment of the present invention, the first opening degree is determined by the following formula:

[0040] In the formula, For the first opening, For the basic valve opening, For the surplus energy that needs to be stored at present, This is the dynamic correction coefficient for thermal storage response. This represents the maximum thermal storage capacity of the thermal storage system. For the efficiency of steam molten salt heat exchangers, This refers to the extraction steam mass flow rate. This represents the maximum permissible opening of the valve. This is the safety margin coefficient.

[0041] According to another embodiment, Figure 3 A schematic block diagram of a heating and power peak-shaving coupling control system for an ultra-supercritical unit according to one embodiment is shown. The system includes a controller and, in sequence, a cryogenic molten salt tank, a high-temperature molten salt tank, a heating network, a power grid, an extraction valve group, an ultra-supercritical turbine high-pressure cylinder, and an ultra-supercritical boiler. The ultra-supercritical boiler is connected to the cryogenic molten salt tank. The controller is electrically connected to the ultra-supercritical boiler, the turbine high-pressure cylinder, the extraction valve group, the high-temperature molten salt tank, and the heating network. When executing the executable code, the controller causes the computer to execute a combination... Figure 1 The method described.

[0042] According to another embodiment, an electronic device is also provided, including a memory and a processor, wherein the memory stores executable code, and when the processor executes the executable code, it implements a combination... Figure 1 The method described.

[0043] The various embodiments in this invention are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the apparatus embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions of the method embodiments.

[0044] Those skilled in the art will recognize that, in one or more of the examples above, the functions described in this invention can be implemented using hardware, software, firmware, or any combination thereof. When implemented in software, these functions can be stored in a computer-readable medium or transmitted as one or more instructions or code on a computer-readable medium.

[0045] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made on the basis of the technical solution of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for coupled control of heating and power peak shaving in an ultra-supercritical unit, characterized in that, The method is applied to the controller of a coupling control system for heating and power peak shaving in an ultra-supercritical unit. The system includes the controller and, in sequence, a low-temperature molten salt tank, a high-temperature molten salt tank, a heating network, a power grid, an extraction steam valve group, an ultra-supercritical turbine high-pressure cylinder, and an ultra-supercritical boiler. The ultra-supercritical boiler is connected to the low-temperature molten salt tank. The controller is electrically connected to the ultra-supercritical boiler, the turbine high-pressure cylinder, the extraction steam valve group, the high-temperature molten salt tank, and the heating network. The method includes: The energy parameter information of the coupled control system for heating and power peak shaving of the ultra-supercritical unit is obtained; wherein the energy parameter information includes the current heating demand load of the heating network, the current energy supply load of the ultra-supercritical boiler, the current heat storage of the high-temperature molten salt tank, and the current energy supply demand load of the power grid. Based on the energy parameter information, the operating status of the ultra-supercritical unit is determined; Based on the aforementioned operating status, the high-pressure cylinder of the ultra-supercritical steam turbine, the ultra-supercritical boiler, the extraction steam valve group, the high-temperature molten salt tank, and the heating network are controlled. After a preset time, the process of "obtaining the current heating demand load of the heating network, the current energy supply load of the ultra-supercritical boiler, and the current energy supply demand load of the power grid" will be executed again.

2. The method according to claim 1, characterized in that, Determining the operating status of the ultra-supercritical unit based on the energy parameter information includes: Based on the current heating demand load and the current energy demand load, determine the total demand load; The total demand difference is determined based on the total demand load and the current energy supply load; The operating status is determined based on the total demand load, the total demand difference, and the current heat storage.

3. The method according to claim 2, characterized in that, The operating states include conventional collaborative mode, thermal storage peak shaving mode, thermal release energy replenishment mode, and emergency supply guarantee mode; Determining the operating status based on the total demand load, the total demand difference, and the current heat storage includes: When the current heat storage is greater than the first preset value and the absolute value of the total demand difference is less than or equal to the first percentage multiplied by the total demand load, the working state is determined to be the normal collaborative mode. When the current heat storage is less than the second preset value and the total demand difference is greater than or equal to the first percentage multiplied by the total demand load, the working state is determined to be heat storage peak shaving mode. When the current heat storage is less than the third preset value and the total demand difference is less than or equal to the first percentage multiplied by the total demand load, the working state is determined to be heat release and energy replenishment mode. When the current heat storage is less than the third preset value and the total demand difference is less than or equal to the second percentage multiplied by the total demand load, the working state is determined to be emergency supply mode. Wherein, the second percentage is greater than the first percentage, the second preset value is greater than the first preset value, and the first preset value is greater than the third preset value.

4. The method according to claim 3, characterized in that, The control of the ultra-supercritical steam turbine high-pressure cylinder, the ultra-supercritical boiler, the extraction valve group, the high-temperature molten salt tank, and the heating network based on the operating state includes: When the working state is the conventional collaborative mode, the extraction valve group allocates steam to the turbine high-pressure cylinder for exhaust according to the first preset ratio; When the working state is the thermal storage and peak shaving mode, the branch valve of the extraction valve group to the low temperature molten salt tank is increased to the first opening degree, and the high pressure cylinder of the ultra-supercritical steam turbine is reduced to the first steam quantity; When the working state is the heat release and energy replenishment mode, the high-temperature molten salt tank is controlled to supply heat to the ultra-supercritical boiler and the heating network. When the operating state is the emergency supply mode, the high-pressure cylinder of the ultra-supercritical steam turbine is reduced to the first power generation capacity and a forced load increase command is sent to the ultra-supercritical boiler.

5. The method according to claim 4, characterized in that, The first steam quantity is determined by the following formula: In the formula, This is the first steam quantity. This refers to the steam output of an ultra-supercritical boiler. For the boiler dynamic response coefficient, For the surplus energy that needs to be stored at present, This is the enthalpy correction factor. This is the enthalpy of extraction. This refers to the extraction steam pressure. The extraction steam temperature. This refers to the enthalpy value of low-temperature molten salt. This refers to the temperature of low-temperature molten salt.

6. The method according to claim 4, characterized in that, The first power generation capacity is determined by the following formula: In the formula, The first power generation capacity, Minimum power for safe operation of the unit This represents the current energy load supplied by the boiler. This is the boiler variable load efficiency attenuation coefficient. For heating load, To correct heat loss in the heating network, For generator efficiency, This represents the rate of change in power generation.

7. The method according to claim 4, characterized in that, The first opening degree is determined by the following formula: In the formula, For the first opening, For the basic valve opening, For the surplus energy that needs to be stored at present, This is the dynamic correction coefficient for thermal storage response. This represents the maximum thermal storage capacity of the thermal storage system. For the efficiency of steam molten salt heat exchangers, This refers to the extraction steam mass flow rate. This represents the maximum permissible opening of the valve. This is the safety margin coefficient.

8. A coupling control device for heating and power peak shaving of an ultra-supercritical unit, characterized in that, The device is applied to the controller of a coupling control system for heating and power peak shaving of an ultra-supercritical unit. The system includes a controller and, in sequence, a low-temperature molten salt tank, a high-temperature molten salt tank, a heating network, a power grid, an extraction valve group, an ultra-supercritical turbine high-pressure cylinder, and an ultra-supercritical boiler. The ultra-supercritical boiler is connected to the low-temperature molten salt tank. The controller is electrically connected to the ultra-supercritical boiler, the turbine high-pressure cylinder, the extraction valve group, the high-temperature molten salt tank, and the heating network. The device includes: The acquisition unit is configured to acquire energy parameter information of the ultra-supercritical unit's heating and power peak-shaving coupled control system; wherein, the energy parameter information includes the current heating demand load of the heating network, the current energy supply load of the ultra-supercritical boiler, the current heat storage capacity of the high-temperature molten salt tank, and the current energy supply demand load of the power grid. The first data processing unit is configured to determine the operating status of the ultra-supercritical unit based on the energy parameter information. The second data processing unit is configured to control the ultra-supercritical steam turbine high-pressure cylinder, the ultra-supercritical boiler, the extraction valve group, the high-temperature molten salt tank, and the heating network based on the operating status. The third data processing unit is configured to re-execute "obtaining the current heating demand load of the heating network, the current energy supply load of the ultra-supercritical boiler, and the current energy supply demand load of the power grid" after a preset time.

9. An electronic device, characterized in that, It includes a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the method as described in any one of claims 1-7.

10. A coupled control system for heating and power peak shaving of an ultra-supercritical unit, characterized in that, The system includes the controller and a cryogenic molten salt tank, a high-temperature molten salt tank, a heating network, a power grid, an extraction valve group, an ultra-supercritical steam turbine high-pressure cylinder, and an ultra-supercritical boiler connected in sequence. The ultra-supercritical boiler is connected to the cryogenic molten salt tank. The controller is electrically connected to the ultra-supercritical boiler, the steam turbine high-pressure cylinder, the extraction valve group, the high-temperature molten salt tank, and the heating network, respectively. The controller is used to execute the method as described in any one of claims 1-7.

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