System-level automatic control method for power plant

Abstract

The invention relates to a system-level automatic control method. According to the method, control function configuration is carried out by setting a hierarchical structure, inter-level activation is carried out by an inter-level excitation instruction, and a system state is confirmed in a mode of fusing an equipment state and system parameters. Compared with the prior art, the method has the advantages that fragmentary and huge system-level control is controlled according to levels, different levels are used for control objects of different scales and levels, and the realization of the whole function depends on the layered deployment of the control function and the activation of the interlayer excitation function arranged in the system-level control device; equivalently, system subitems are virtualized into logic equipment of a higher layer, so that the real-time running state of the virtualized logic equipment is dispatched and analyzed for the realization of a system layer control function, and the level of monitoring the whole modularization is increased.

Description

Technical Field

[0001] The present application relates to power plant system control, and in particular to a system-level automatic control method technology for a power plant. Background Art

[0002] With the development of energy utilization technology and the demand for energy system architecture, the demand for power plant economy, environmental protection, carbon friendliness, etc. is constantly increasing. The complexity of the setting of conventional fossil energy conversion and utilization systems has increased, the volatility of new energy conversion and utilization systems is relatively strong, and the demand for the integration of different energy sources has increased. Under the above background, the requirements for the overall automation level of the system are getting higher and higher. Power plants require power plant control systems to improve the overall control level, reduce human intervention, and increase the overall control level of the control system over complex process systems through control, computing and information technologies. In order to solve the above problems, the present invention proposes a system-level control method for power plants.

[0003] Currently, system-level control in power plants is implemented through functional groups, functional subgroups, and device-level control. Functional groups typically focus on sub-areas or subsystems with specific interlocking relationships, such as a pump and its inlet and outlet valves, a minimum recirculation line, or a heat exchanger and its inlet, outlet, and bypass channels. Step design is then performed for the selected subsystems based on the device relationships. This setup results in discontinuous subsystem selection and a point-by-point approach, essentially implementing only small, localized interlocking functions. The implementation of higher-level control functions based on this approach requires extensive device-level step design, making control system setup cumbersome and the execution of fragmented device-level steps in the control system more resource-intensive, such as computational and storage, and resulting in increased control system execution time.

[0004] The following problems exist with unit-level and / or system-level control functions and the discontinuous subsystem selection method that uses equipment as the step setting object:

[0005] 1. The selection of subsystems is very arbitrary and difficult to achieve systematicity, thus affecting the integrity and reliability of the unit-level control system functions.

[0006] 2. Unclear interfaces at each system level make it easy for many control functions to be duplicated or omitted. The ultimate realization of top-level control requirements, such as the unit's automatic start and stop function, relies on the reliable implementation of full-scale, all-level control functions at the equipment, system, and unit levels. The lack of control functions at any one level will directly affect the ultimate realization of the upper-level control level.

[0007] 3. Since scattered independent equipment is used as the control object, the processes and control objects included in the step design are too complicated, and the workload of control function design and implementation is huge, resulting in integrity problems in project practice.

[0008] 4. The equipment-level control function has set up a large number of interlocking functions through start-stop conditions, equipment protection, equipment interlocking, etc. The system-level step design is designed based on the equipment as the element, which makes a large part of the functions repeated, which can easily lead to problems such as inconsistent control function settings, waste of control system resources, long control function execution time, and scattered operator monitoring elements.

[0009] In order to solve the above problems, the present invention proposes a system-level control method for a power plant. Summary of the Invention

[0010] The purpose of this application is to provide a system-level control method for a power plant, so as to systematically control the equipment in the power plant.

[0011] The present application discloses a system-level automatic control method for a power plant, which comprises the following steps:

[0012] (1) Divide the power plant system into levels according to control functions:

[0013] The power plant system is divided into a system layer, an equipment layer, and an upper system layer, wherein:

[0014] The device layer is configured with specific devices within the system as objects to implement device start / stop conditions, device protection functions, and inter-device interlocking functions. The system layer includes system sub-items, which divide the power plant system into logically independent sub-items based on a multi-dimensional streamline logic partitioning method. The system layer uses the system sub-items as control objects and is configured to control the system sub-items through system-level control devices to implement system-level functions. Interlocking functions within the system sub-items are implemented at the device layer.

[0015] (2) Entering information into the system-level control device:

[0016] Inputting information of the equipment layer, the system layer, and the system sub-items, as well as operating condition parameters of the power plant system into the system-level control device;

[0017] The system-level control device is configured to control the system sub-items to implement system-level functions. The system-level control device divides the power plant system into three aspects: main circuit equipment, branch circuit equipment, and conditional parameters. The start-up permission function is set based on the principle that all main circuit equipment is available, the branch circuit equipment meets the commissioning quantity requirements, and the conditional parameters meet the requirements;

[0018] The system-level control device is configured to perform the following steps through pre-recorded data:

[0019] The start permission signal and the start instruction are satisfied simultaneously to start the system-level control function, send the automatic setting instruction of the equipment in the system sub-item and send the start instruction of the selected excitation equipment in the system sub-item, activate the interlocking function of the equipment in the system sub-item, and display the status and operating parameters of the equipment in the system sub-item;

[0020] (3) Start the system sub-item by sending instructions through the upper system layer:

[0021] Sending a command to start the first of the system sub-items to the system-level control device through the upper system layer; the system-level control device starts the system sub-item after receiving the command;

[0022] (4) Monitor the operating status in real time through the system-level control device and start the system sub-items in sequence:

[0023] When the system-level device monitors the operation of the system sub-item to the pre-input condition parameter, it sends an instruction to the upper system layer. After receiving the instruction, the upper system layer repeats step (3) to start the next system sub-item.

[0024] In a preferred example, the multi-dimensional streamline logic partitioning method includes process system characteristic partitioning, container partitioning method and aggregation partitioning method.

[0025] In a preferred example, a unified signal interface device is integrated in the system-level control device for connecting the system-level control device with the devices in the system sub-items.

[0026] In a preferred example, the system sub-item includes an excited device, and the excited device is a device that is linked and started when the system sub-item is started.

[0027] In a preferred embodiment, the number of the stimulated devices is the minimum required to stimulate the chain of devices included in the system sub-item.

[0028] In a preferred example, the system layer can be set up by nesting the system layer, system sub-layer, and sub-layer within the system and their combination according to the situation of the specific project being implemented.

[0029] In a preferred example, the system-level functions include: system-level start and stop conditions, automatic setting of devices in the system, sending start-up instructions to selected devices, and feedback of system-level operating status.

[0030] In a preferred embodiment, the control method may be executed starting from step (3) when used for the second time.

[0031] The present invention has the beneficial effects of:

[0032] (1) This invention proposes a system configuration method for multi-dimensional streamline logic partitioning. This method divides a large process system into relatively independent functional sub-systems according to process flow, functional characteristics, etc., based on the characteristics of the process system. For systems with transport properties, the container partitioning method is adopted. For systems with scattered material addition characteristics, the aggregation partitioning method is adopted.

[0033] (2) The present invention decomposes and subdivides the huge sequential control function into two dimensions, namely, the division of system sub-items in the process system dimension and the realization of individual functions layer by layer in the control function dimension, as well as the connection of functions between layers. This method makes the setting structure and functions of the control system clear, avoids confusion in function settings, and enables operators to monitor with clear hierarchical and module concepts, thereby improving the control and monitoring level.

[0034] It should be understood that within the scope of the present invention, the above-mentioned technical features of the present invention and the technical features described in detail below (such as in the embodiments) can be combined with each other to form new or preferred technical solutions. Due to space limitations, they will not be listed here one by one.

[0035] The specification of this application records a large number of technical features, which are distributed in various technical solutions. If all possible combinations of technical features of this application (i.e., technical solutions) are to be listed, the specification will be too lengthy. In order to avoid this problem, the various technical features disclosed in the above-mentioned invention content of this application, the various technical features disclosed in the various embodiments and examples below, and the various technical features disclosed in the accompanying drawings can be freely combined with each other to form various new technical solutions (these technical solutions are all deemed to have been recorded in this specification), unless such a combination of technical features is technically infeasible. For example, in one example, feature A+B+C is disclosed, and in another example, feature A+B+D+E is disclosed. Features C and D are equivalent technical means that play the same role. Technically, only one of them can be used, and it is impossible to use them at the same time. Feature E can be technically combined with feature C. Then, the solution of A+B+C+D should not be considered as having been recorded because it is technically infeasible, while the solution of A+B+C+E should be considered as having been recorded. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. It should be understood that the drawings described below are merely some implementation examples of the present invention, and those skilled in the art can also derive other implementation examples based on these drawings without inventive effort.

[0037] Figure 1 is a schematic diagram of a control method according to an embodiment of the present application;

[0038] Figure 2 1 is a schematic diagram of the architecture of a system layer division method according to an embodiment of the present application;

[0039] Figure 3 is a structural diagram of a system-level control device according to an embodiment of the present application;

[0040] Figure 4 is a flow chart of a control function according to an embodiment of the present application. DETAILED DESCRIPTION

[0041] Through extensive and in-depth research, the inventors have developed a system-level automatic control method. This method configures control functions by setting a hierarchical structure, activates inter-level functions through inter-level incentive commands, and confirms system status through the integration of device status and system parameters. Device-level functions are configured according to the principles of traditional device modules and the function allocation and configuration proposed in this method, ensuring functional integrity. This method allows fragmented and complex system-level control to be implemented hierarchically, with different levels controlling objects of varying scales, such as system sub-items at the system level and devices at the device level. Different levels assign different control functions, such as device interlocking, protection, and start / stop permission at the device level, while the system level implements device-level activation, system-level start / stop, and permission functions. Overall functional implementation relies on the hierarchical deployment of control functions and the activation of inter-level incentive functions within the system-level control device. System-level status is confirmed by collectively representing the status of key devices within the system and their conditional parameters. This effectively virtualizes system sub-items into higher-level logical devices, allowing system-level control functions to dispatch and analyze the real-time operating status of these virtualized logical devices, thereby enhancing the overall modularity of monitoring.

[0042] In the following description, many technical details are provided to help readers better understand this application. However, those skilled in the art will understand that even without these technical details and various changes and modifications based on the following embodiments, the technical solutions claimed in this application can be implemented.

[0043] the term

[0044] System layer

[0045] The system layer divides the system into logically independent sub-items based on the characteristics of the process system. These sub-items serve as system-level control objects, implementing relatively specific system-level functions within them. These include system-level start and stop conditions, setting system equipment to automatic, sending start commands to selected excitation equipment, and providing feedback on system-level operating status. All interlocking functions within the sub-items are implemented at the equipment level.

[0046] Device layer

[0047] The device layer of the present invention is set up with devices as objects to realize device start and stop conditions, device protection functions, and inter-device interlocking functions.

[0048] Upper system layer

[0049] The upper system layer implements the step control function with system sub-items as objects.

[0050] Multidimensional streamline logical partitioning method

[0051] This invention proposes a multi-dimensional streamline logical partitioning method. Based on process system characteristics, such as fluid transfer, heat exchange, and component combination, this method divides a large process system into relatively independent functional sub-systems. The basic concept of this method is to divide the overall power plant system into logical sub-systems based on process flow and functional characteristics. For transport systems, a container partitioning method is used, abstracting the system into elements such as containers, main lines, branches, equipment, and parameters. The principle of partitioning system sub-systems is that these elements fulfill complete and independent functions. For example, a condensate system would have the condenser as the starting container and the deaerator as the ending container. This system sub-system includes the main line, branches, and related equipment, primarily fulfilling the condensate transport function. In addition to streamlines for specific fluid transfer, the system sub-system division also includes intersecting streamlines, such as those for heat exchange and component mixing, which form another dimension of system sub-system division. For system sub-systems in other dimensions, such as heat exchange and component mixing, when these dimensions fulfill transport functions, the container partitioning method is used for that dimension. When there is no obvious process transportation, but a scattered material addition is presented, such as a steam extraction system, the main line, branch line and related equipment and parameters that complete specific functions in the same state are divided into a system sub-item.

[0052] System-level control device

[0053] The system-level control device divides the system into main circuit devices, branch circuit devices, and parameters. The start permission function is set based on the principle that all main circuit devices are available, the branch circuit devices meet the required number of commissioning devices, and conditional parameter group 1 (conditional parameters). The start permission signal and the start command are both satisfied to activate the system-level control function. The start command can come from a button set in the system-level control device module or from an external start command. Once the system-level control device start function is activated, the automatic function of the devices within the system sub-item is executed and the start command of the selected excitation device is sent. The start of the selected excitation device triggers the activation of the interlocking function of the devices within the system sub-item, and the system sub-item is started at the device level.

[0054] The system-level automatic control method proposed in the present invention is that the realization of the system-level control function will have a large number of unified signal interfaces with the devices therein. For this purpose, a unified signal interface device is integrated in the system-level control device to collect signals from branch devices for the realization of the system-level control function, and the configuration port of the signal interface device is set according to the specific usage situation, such as: 1-equipment failure; 2-equipment automatic instruction; 3-equipment automatic status, etc.

[0055] The system-level control device will be connected with the various devices and parameters of the system sub-items defined above according to the roles they play, and normalize and standardize the implementation of the system-level control functions.

[0056] Example

[0057] An embodiment of the power plant system level control method proposed by the present invention is as follows: Figures 1-4 As shown in Figure 1, it includes the system layer, upper system layer and device layer.

[0058] The upper system layer is configured to implement a step sequence control function with the system sub-items as objects.

[0059] The device layer is set up based on specific devices in the system to implement device start and stop conditions, device protection functions, and inter-device interlocking functions;

[0060] The system layer includes system sub-items, which are logically independent sub-items formed by dividing the power plant system according to a multi-dimensional streamline logic partitioning method. The system layer uses these system sub-items as control objects and is configured to control these system sub-items through system-level control devices to implement system-level functions. Interlocking functions within these system sub-items are implemented at the device layer. In this embodiment, these system-level functions include: system-level start and stop conditions, automatic setting of system devices, sending start commands to selected devices, and feedback on system-level operating status. The system sub-items include activated devices, which are devices that activate when the system sub-items are activated.

[0061] The system-level control device divides the power plant system into three aspects: main circuit equipment, branch circuit equipment and conditional parameters, and sets the start-up permission function based on the principle that all main circuit equipment is available, branch circuit equipment meets the commissioning quantity requirements and conditional parameters meet the requirements.

[0062] Optionally, in one embodiment, the multi-dimensional flow line logic partitioning method includes process system characteristic partitioning, container partitioning method and aggregation partitioning method.

[0063] Optionally, in one embodiment, a unified signal interface device is integrated in the system-level control device for connecting the system-level control device with the devices in the system sub-items.

[0064] Optionally, in one embodiment, the control method further includes a system sublayer, and the system sublayer, the system layer and the upper system layer can be nested and combined.

[0065] In order to make the system-level control function reliable and standardized, improve the configuration effect and efficiency of the system-level control function, and at the same time make the monitoring personnel and monitoring equipment highly automated, the specific implementation method of the system-level control device of this embodiment is as follows: Figure 3 As shown. The system-level control device divides the system into main circuit equipment, branch circuit equipment and parameters. The start permission function is set based on the principle that all main circuit equipment is available, the branch circuit equipment meets the commissioning quantity requirements and conditional parameter group 1 (conditional parameters). The start permission signal and the start instruction are met at the same time to start the system-level control function. The start instruction can come from the button set by the system-level control device module or from an external start instruction. After the start function of the system-level control device is activated, the automatic function of the equipment in the system sub-item will be executed and the start instruction of the selected excitation device will be sent. The start of the selected excitation device will trigger the activation of the interlocking function of the equipment in the system sub-item, and the system sub-item will realize the start of the device layer.

[0066] The specific operation process of this embodiment is as follows Figure 4 As shown, after completing steps (1) of dividing the power plant system into hierarchical levels according to control functions and (2) entering the information into the system-level control device, in actual operation, after receiving the request for the unit-level control mode from the power plant, the upper system layer starts system sub-item 1 in accordance with the steps. After system sub-item 1 receives the start command, the system-level control device performs the following operations: allowing condition judgment, setting the device to automatic, and sending a start instruction to the selected excitation device. After the instruction enters the device layer, the devices in the device layer execute the internal interlocking control. After system sub-item 1 starts for a certain period of time until the condition parameter group meets the value set by the system-level control device, system sub-item 2 is started in sequence, and then the same process is repeated until all system sub-items in the entire system layer are started.

[0067] It is worth noting that in this embodiment, starting from the second startup, the system sub-item can be started directly from the upper system layer step, without the need to redo the hierarchical division and the steps of entering the system-level control device.

[0068] It should be noted that in this patent application, relational terms such as first and second, etc., are used solely to distinguish one entity or operation from another, and do not necessarily require or imply any actual relationship or order between these entities or operations. Furthermore, the terms "comprise," "include," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. Without further limitation, an element specified by the phrase "comprising a" does not preclude the presence of additional identical elements in the process, method, article, or apparatus comprising the element. In this patent application, reference to performing an action in accordance with an element means performing the action in accordance with at least that element, including two situations: performing the action in accordance with that element alone, and performing the action in accordance with that element and other elements. Expressions such as "plurality," "multiple times," and "many" include "two," "twice," "two kinds," and "more than two," "more than two times," and "more than two kinds."

[0069] In the present invention, all directional indications (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

Claims

1. A system-level automatic control method for a power plant, characterized in that: The control method shown includes the following steps: (1) Divide the power plant system into levels according to control functions: The power plant system is divided into a system layer, an equipment layer, and an upper system layer, wherein: The device layer is configured with specific devices within the system as objects to implement device start / stop conditions, device protection functions, and inter-device interlocking functions. The system layer includes system sub-items, which divide the power plant system into logically independent sub-items based on a multi-dimensional streamline logic partitioning method. The system layer uses the system sub-items as control objects and is configured to control the system sub-items through system-level control devices to implement system-level functions. Interlocking functions within the system sub-items are implemented at the device layer. (2) Entering information into the system-level control device: Inputting information of the equipment layer, the system layer, and the system sub-items, as well as operating condition parameters of the power plant system into the system-level control device; The system-level control device is configured to control the system sub-items to implement system-level functions. The system-level control device divides the power plant system into three aspects: main circuit equipment, branch circuit equipment, and conditional parameters. The start-up permission function is set based on the principle that all main circuit equipment is available, the branch circuit equipment meets the commissioning quantity requirements, and the conditional parameters meet the requirements; The system-level control device is configured to perform the following steps through pre-recorded data: The start permission signal and the start instruction are satisfied simultaneously to start the system-level control function, send the automatic setting instruction of the equipment in the system sub-item and send the start instruction of the selected excitation equipment in the system sub-item, activate the interlocking function of the equipment in the system sub-item, and display the status and operating parameters of the equipment in the system sub-item; (3) Start the system sub-item by sending instructions through the upper system layer: Sending a command to start the first of the system sub-items to the system-level control device through the upper system layer; the system-level control device starts the system sub-item after receiving the command; (4) Monitor the operating status in real time through the system-level control device and start the system sub-items in sequence: When the system-level device monitors the operation of the system sub-item to the pre-input condition parameter, it sends an instruction to the upper system layer. After receiving the instruction, the upper system layer repeats step (3) to start the next system sub-item.

2. The power plant system-level automatic control method according to claim 1, characterized in that: The multi-dimensional streamline logic partitioning method includes process system characteristic partitioning, container partitioning method and aggregation partitioning method.

3. The power plant system-level automatic control method according to claim 1, characterized in that: The system-level control device is integrated with a unified signal interface device for connecting the system-level control device with the devices in the system sub-items.

4. The power plant system-level automatic control method according to claim 1, characterized in that: The system sub-item includes an excited device, and the excited device is a device that is linked and started when the system sub-item is started.

5. The power plant system-level automatic control method according to claim 4, characterized in that: The number of the stimulated devices is the minimum required to stimulate the device chain contained in the system sub-item.

6. The power plant system-level automatic control method according to claim 1, characterized in that: The system layer can be set up by nesting the system layer, system sub-layer, and sub-layer within the system according to the specific situation of the implemented project, and combining the system layer.

7. The power plant system-level automatic control method according to claim 1, characterized in that: The system-level functions include: system-level start and stop conditions, automatic setting of devices in the system, sending start instructions to selected devices, and feedback of system-level operating status.

8. The power plant system-level automatic control method according to claim 1, characterized in that: The control method may be executed starting from step (3) when used for the second time.

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