CN113552854A - Virtual twin system for power plant operation - Google Patents
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- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM]
- G05B19/41865—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM] characterised by job scheduling, process planning, material flow
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
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Abstract
The invention relates to a power plant operation virtual twin system VDT (virtual Digital twin), which can realize network compact Data interconnection with a power plant Control system DCS (distributed Control System) and a power plant Real-Time/history database system RTDB (Real-Time Data Base). The power plant operation virtual twin system comprises a virtual control system, a power plant equipment virtual twin mathematical model system and a simulation analysis function system; the new data-driven power plant operation virtual twin system in the technical scheme is a higher-level power plant real-time simulation online application system, and the application requirements of the system comprise: the connection between the DCS system and the VDT system is realized, program downloading in aspects of control configuration, parameter setting and the like of the DCS system can be realized, the control quality of the virtual DCS is improved, and thermal control personnel training can be better carried out; the scheme can realize the connection of the VDT system to the DCS system, so that dynamic tests are carried out, and performance optimization or abnormal analysis of the DCS system is carried out according to the calculation result of the mathematical model.
Description
Technical Field
The invention relates to a power plant system, in particular to a virtual twin system for power plant operation, and belongs to the technical field of power plant digital control systems.
Background
The large power plants in China comprise large coal-fired thermal power plants, gas-steam combined cycle power plants, nuclear power plants, hydraulic power plants and the like. As the production process of continuous power generation is adopted, a Control system DCS (distributed Control System) of a large-scale power plant is used as a key system of power production and is in the core position of operation Control. On the basis of continuous progress of computer technology and network technology, large power plants are basically equipped with a Real-Time Data Base (RTDB) and a simulation System (SIMU) for training, which constitute three Real-Time systems of the large power plants. The three real-time systems of the power plant have the following functions:
1) the control system DCS is used for directly controlling equipment such as a boiler, a nuclear reactor, a steam turbine, a gas turbine, a generator and the like of a power plant, realizing logic and automatic regulation functions and ensuring the start-stop and variable working condition stable operation of a generator set;
2) the real-time/historical database system RTDB is mainly an information system for real-time management and monitoring of the production process of the comprehensive optimization service of the real-time production process of the power plant, and is used for providing real-time monitoring data of units for a management layer and a functional department, providing information basis for operation and maintenance decisions and managing mass historical data;
3) the SIMU is mainly used for training the operators of the power plant and is used for optimizing the operation of the unit and analyzing faults.
The three real-time systems have different working purposes, system platforms and software functions, but have consistent real-time requirements, and the response time of each system is 10-100 milliseconds, so that the requirements of large-capacity and high-speed data calculation processing for controlling, monitoring and simulating the generator set of the large-scale power plant are met. Meanwhile, the three real-time systems have different construction time and source of supply manufacturers and have great independence. At present, a direct network connection relationship exists between a DCS and an RTDB, and input and output data of the DCS are transmitted to the RTDB in a one-way mode and stored in the RTDB for providing a real-time/historical data source for realizing digital intelligent application of various power plants due to safety requirements. However, only data is provided between DCS and RTDB and SIMU, and there is no network data tight interconnection relationship that has been successfully applied. The power plant simulation system SIMU system mainly comprises a power plant mathematical model system and a virtual control system. The data providing relationship is that the virtual control system part loads the configuration data of the real DCS into the virtual control system directly or through compiling and converting, and can ensure that 1:1 analog control system function. The data providing relation is that in the mathematical model system part of the power plant, technical data such as system design, equipment parameters, operation rules and the like of the power plant are provided, and a simulation system development unit applies respective modeling tools to develop and debug a mathematical model software system of the power plant until the mathematical model software system is successfully operated, so that the aim of training operators is fulfilled.
In order to achieve the purpose of improving the safety and the economy of a large-scale power plant by using a digital intelligent technical means, it is necessary to establish a network data tight interconnection relation between a control DCS and a real-time/historical data system (RTDB) and a simulation System (SIMU), fully utilize a physical model, measurement and control data update of the DCS and operation historical data of the RTDB, integrate a simulation process of multidisciplinary, multiple physical quantities, multiple scales, multiple probabilities and multiple working conditions, and complete mapping in a virtual space, thereby reflecting the full life cycle operation process of entity system equipment of the power plant. On the basis of the new generation of information technology, a brand new Digital twin system, or a virtual twin system, vdt (virtual Digital twin), is constructed. The virtual twin system is composed of a virtual control system and a virtual twin mathematical model. After the virtual control system is widely adopted, the most important thing is to adopt a specially designed modeling method to establish a data-driven power plant virtual twin mathematical model.
Disclosure of Invention
The invention provides a Virtual Twin System for Power Plant operation aiming at the problems in the prior art, and the Power Plant Virtual Digital Twin System (Power Plant Virtual Digital Twin System) in the technical scheme is composed of a Virtual control System, a Power Plant equipment Virtual simulation mathematical model System and other functional systems, and is a real-time online simulation System capable of receiving RTDB (real-time data database) direct drive of Power Plant real-time/historical data. The virtual control system generally directly adopts the configuration of a real control system DCS, and a data-driven power plant equipment virtual simulation mathematical model is specially designed. The power plant operation virtual twin system disclosed by the invention implements a series of functions and innovation promotion on a method on a conventional power plant simulation training system, and ensures that the 1:1 high-entity degree and high-fidelity fused power plant digital space twin analog simulation mapping can be realized in all aspects of models, control, data, range, working conditions and the like.
In order to achieve the purpose, the technical scheme of the invention is that a virtual twin system VTD (virtual Digital twin) for power plant operation is adopted, and the virtual twin system for power plant operation can be a power plant analysis simulation system which can realize network tight Data interconnection with a power plant Control system DCS (distributed Control system) and a power plant Real-Time/historical database system RTDB (Real-Time Data Base).
The power plant operation virtual twin system comprises a virtual control system, a power plant equipment virtual twin mathematical model system and a simulation analysis function system. For an improvement of the invention, the data-driven power plant virtual twin mathematical model is modeled, the number of initial conditions IC (initial condition) of the mathematical model system is strictly limited, the number of points of the initial conditions IC of the virtual twin system is equal to or less than the number of points which can be transmitted by a real-time/historical database RTDB, namely equal to or less than all input/output I/O points defined by a power plant control system DCS, and the definition of the initial conditions IC points of the virtual twin system is completely consistent with the definition of the I/O points of the RTDB and the DCS.
As an improvement of the invention, a load Set function of a power plant running a virtual twin system directly loads a real-time data slice of RTDB, the real-time data slice is used as an initial condition of virtual twin to start simulation running, a heavy load Reset function of the power plant running the virtual twin system has three sources selected as the initial condition of virtual twin simulation, wherein the three sources are Backtrack for loading the virtual twin system to automatically store an IC, Snapshot for loading the virtual twin system to manually store the IC and Historan for loading a historical data packet IC of the RTDB at a certain moment. This requires the virtual twin system to maintain a tight network data interconnection with the real-time/historical database system RTDB, the twin simulation run being data driven from the RTDB. For the third data source of the reload, RTDB data decompression is also done.
As an improvement of the invention, the simulation analysis functions of the power plant operation virtual twin system comprise a return tracking backup function module, a Replay function module, an automatic storage Auto IC function module and a Manual storage Manual IC function module, so that the data volume of the simulation system is inevitably greatly increased, and almost no limit is realized. Therefore, the invention is characterized in that the capacity expansion of the virtual twin system data is dealt with by applying the new generation information technology of the distributed big data cluster.
As an improvement of the invention, the power plant operation virtual twin system comprises an operation Run function module, a modeling Make function module, a freezing Freeze function module and a Stop function module, wherein the operation Run function module of the power plant operation virtual twin system is a simulation calculation function; the invention relates to a modeling Make functional module of a power plant operation virtual twin system, which is characterized in that the model parameter calculation function is carried out; a freezing Freeze function module of the virtual twin system operated by the power plant is a freezing calculation function; and the Stop function module of the virtual twin system operated by the power plant is used for stopping the calculation function.
The method is characterized in that the data definition of a virtual twin mathematical model module of the power plant equipment comprises variables and parameters, wherein the variables comprise input variables, intermediate variables and output variables; the parameters comprise determined parameters and variable parameters; the output variables include measurable output variables and non-measurable output variables.
As an improvement of the invention, a virtual twin mathematical model module of the power plant equipment is established and programmed in a unified way, and input variables of the module are strictly defined and only measurable interface points of pressure, temperature, flow, liquid level, rotating speed, valve position, current, voltage, power, switch state and the like from a real-time/historical database RTDB are taken as module input variables; any intermediate calculated quantity, unmeasured calculated quantity, engineering empirical formula identification quantity and the like cannot be used as input variables of the virtual twin mathematical model module, and mathematical model formula programs in the module are substituted into the input variables, the calculation parameters and the like, so that various output variables can be strictly calculated; all input variables and measurable output variables of the module are consistent with the point table transmitted by the RTDB by contrasting the point table of the RTDB, and can be recorded and stored as simulation operation.
As an improvement of the invention, a virtual twin mathematical model module of the power plant equipment is compiled by adopting a double-calculation function system, wherein one is a simulation calculation function, the other is a parameter calculation function, and the mode of the simulation calculation function is to calculate an output variable by an input variable and a parameter; the mode of the parameter calculation function is that variable parameters are calculated by input variables, determined parameters and measurable output variables, the simulation calculation function is called by a Run function, and the parameter calculation function is called by a Make function.
As an improvement of the invention, the power plant operation virtual twin system executes and operates a Run function module to perform a simulation calculation function, and the complete simulation operation is carried out from an IC point of Set or Reset, during which the operation of a virtual DCS can be accepted, fault insertion, local operation and environmental parameter change are accepted, wherein the Reset of Set or RTDB data is driven by real-time or historical power plant data to start the simulation calculation.
As an improvement of the method, a power plant operates a virtual twin system to execute a modeling Make function module to perform a parameter calculation function, wherein the step of executing Set from the current point of Set and from the RTDB continuously; or starting from the IC point of Reset, continuously executing Reset from the RTDB sequence, and continuously calculating variable parameters, namely performing parameter calculation driven by the data of the power plant.
Compared with the prior art, the invention has the following advantages that 1) the new data-driven power plant operation virtual twin system in the technical scheme is actually a higher-level power plant real-time simulation online application system, and the application requirements of the system comprise: the connection between the DCS system and the VDT system is realized, program downloading in aspects of control configuration, parameter setting and the like of the DCS system can be realized, the control quality of the virtual DCS is improved, and thermal control personnel training can be better carried out; 2) the scheme can realize the connection of the VDT system to the DCS system, so that a dynamic test is carried out, and the performance optimization or the abnormal analysis of the DCS system is carried out according to the calculation result of the mathematical model;
3) the connection between the RTDB system and the VDT system can be realized, so that the simulation mathematical model obtains the initial working condition IC at the current or a certain historical moment, and an initial operation point is provided for further unit state analysis; the connection between the VDT system and the RTDB system can be realized, so that operation monitoring and maintenance decision personnel can conveniently compare the real-time data with the simulation data and make correct judgment; 4) the power plant operation virtual twin system designed by the invention can realize reverse data driving, at the moment, virtual twin data are guided to a power plant real-time/historical database RTDB system to become another set of virtual twin simulation data sources except a DCS interface data source, and the two data sources are in a mapping relation which can be in one-to-one correspondence with the roll calling definition. Therefore, all monitoring functions, calculation functions, analysis functions, evaluation functions, test functions, management functions and the like which the RTDB already has can be migrated to the virtual twin system as they are, and the function training can be realized without adding a new data management module. If the existing RTDB is switched to adopt reverse data drive, namely data of a virtual twin system operated by a reverse injection power plant, effect prediction can be carried out on various management measures and transformation measures, and the function of the RTDB is fully improved; 5) the power plant operates a virtual twin system, and under the drive of RTDB data, the scheme is designed to become an important real-time application project on the cloud of a digital intelligent power plant enterprise. Besides providing an operator training function at a power plant training center, providing a virtual twin analysis function at a terminal of a central control room of a power plant, providing a virtual twin analysis function at a terminal of a specialist conference room of the power plant, and providing a virtual twin analysis function at a terminal of an office of a maintenance planning engineer of the power plant. The invention relates to a virtual twin system for power plant operation, which realizes distributed multi-task networked operation and is characterized in that the virtual control man-machine interface operation of training personnel, the virtual control man-machine interface operation of maintenance planning personnel and the single-operation double-machine input of the on-duty unit operator of the power plant through a DCS (distributed control system) man-machine interface and a virtual control system man-machine interface of a real control system are received, so that the effects of on-site teaching and operation evaluation are obtained; 6) the power plant operates the virtual twin system, reverse data driving can be realized, at the moment, the virtual twin data are guided to a real-time/historical database RTDB system of the power plant to become another set of virtual twin data sources except a DCS interface source, and the two data sources are point name definitions and can be in one-to-one correspondence mapping relation, so that all monitoring functions, calculation functions, analysis functions, evaluation functions, test functions, management functions and the like which the RTDB has can be migrated to the virtual twin system without change.
It is clear to a person skilled in the art that the invention can be implemented by means of software. Based on such understanding, the definition and characteristic contribution of the data-driven power plant operation virtual twin system of the present invention to the technical ideas and method steps can be embodied in various software products. Therefore, all or a portion of the technical ideas and method steps set forth in the present invention should be included in the scope of the present invention in any form of software, directly or indirectly embodied. The invention is not to be considered as limited by the claims which follow, but is to be accorded the widest scope consistent with the principles, teachings, models, and methods of the present invention.
Drawings
FIG. 1 is a schematic diagram of a three-large real-time system composition framework of a power plant.
FIG. 2 is a schematic diagram of a virtual twin system for power plant operation.
FIG. 3 is a relational diagram of real-time/historical database data point definition and virtual twin system initial condition point definition.
FIG. 4 is a schematic diagram of three initial conditions for operating a virtual twin system in a power plant.
FIG. 5 is a diagram of variables and parameter definitions for a mathematical model of a virtual twin system for plant operation.
FIG. 6 is a schematic diagram of two calculated operating functions of a virtual twin system operated by a power plant.
FIG. 7 is a schematic diagram of the distribution of the virtual twin system application in the operation of the power plant.
Fig. 8 is a schematic diagram of a single-operation dual-machine working mode of the virtual twin system operated by the power plant.
FIG. 9 is a schematic diagram of a reverse data driven operation of a virtual twin system operated by a power plant.
The specific implementation mode is as follows:
example 1: for the purpose of promoting an understanding of the invention, reference will now be made in detail to the present embodiments of the invention, examples of which are illustrated in the accompanying drawings.
Referring to fig. 1, a framework of three Real-Time systems of a Power Plant includes a distributed Control System dcs (distributed Control System) at the core of operation Control, a Real-Time Data Base (RTDB) as the center of Real-Time Data record, and a Power Plant Virtual Digital Twin System established by the present invention. Three real-time systems will establish a correlation with data interfaces and data drivers.
Referring to fig. 2, the invention is a real-time online simulation system capable of receiving direct drive of real-time/historical data RTDB of a power plant. The virtual twin system for the power plant operation comprises a virtual control system, a power plant equipment virtual twin mathematical model system and a simulation analysis function system. The virtual control system is composed of a virtual human-computer interface, a virtual controller and a data interface of a virtual twin mathematical model system of the power plant equipment.
Referring to FIG. 3, a relationship diagram is defined for real-time/historical database data points and virtual twin system initial condition points. The data-driven power plant equipment virtual simulation mathematical model is specially designed. According to the conventional power plant training simulation system, the number of IC points under the initial condition is not limited, and assigned variables in each module are added into simulation database points according to the requirements of modeling and programming, so that an IC point complete set is formed. For mathematical model modeling of a data-driven power plant operation virtual twin system, the invention is designed to strictly limit the number of initial conditions IC of the mathematical model system. The number of the initial condition IC points of the virtual simulation system is equal to or less than the number of the points which can be transmitted by the real-time/historical database RTDB, namely equal to or less than the number of all input/output I/O points defined by the power plant control system DCS. The definition of the initial condition IC point of the virtual twin system is completely consistent with the definition of the I/O points of the RTDB and the DCS.
Referring to fig. 4, three Reset initial condition diagrams for operating the virtual twin system for the power plant are shown. The loading Set function of the power plant operation virtual twin system is designed to be a real-time data slice for directly loading RTDB, and the real-time data slice is used as an initial condition of virtual twin to start simulation operation. The invention relates to a heavy load Reset function of a virtual twin system operated by a power plant, which is designed to have three sources selected as initial conditions of virtual twin, wherein the initial conditions comprise loading of an IC Backtrack automatically stored by the virtual twin system, loading of an IC Snapshot manually stored by the virtual twin system and loading of a historical data packet IC Historian at a certain moment of RTDB. This design requires a virtual twin system to maintain a tight network data interconnection with the real-time/historical database system RTDB, the twin system operation process being data driven from the RTDB. For the third data source of the reload, RTDB data decompression is also done.
Referring to FIG. 5, a schematic diagram is defined of variables and parameters of a mathematical model of a virtual twin system for plant operation. In order to realize virtual twinning, in the aspect of a modeling definition method, a virtual twinning mathematical model module top-level data definition comprises Variables and Parameters; the variables include three variables of input variables, intermediate variables and output variables; the parameters comprise a fixed parameter and a variable parameter; the output variables herein include both measurable and non-measurable output variables.
Referring to fig. 6, two schematic diagrams of the calculation operation functions of the virtual twin system for the power plant are shown. Aiming at various virtual twin mathematical model modules of power plant equipment, the invention provides a dual-calculation function system for programming. Namely, the simulation main functions are two, one is a simulation calculation function, and the other is a parameter calculation function. The simulation calculation function is a function for calculating an output variable from an input variable and a parameter. The parameter calculation function is a function for calculating a variable parameter from an input variable, a fixed parameter, and a measurable output variable. The simulation calculation function is used for calling a Run function, and the parameter calculation function is used for calling a Make function. The specially designed modeling Make function of the power plant operation virtual twin system is a function of calculating parameters of a virtual twin model, and certain parameters of the model are determined according to data transmitted from the RTDB.
Referring to fig. 7, a schematic diagram of the distribution of the virtual twin system application for the power plant operation is shown. The power plant operation virtual twin system and the RTDB realize network interconnection, and can become an important real-time application project content on the cloud of the digital intelligent power plant enterprise under the drive of the RTDB data. Besides the training function of operators provided in the training center of the power plant, the virtual twin analysis function can be provided at the terminal of the value station of the centralized control room of the power plant, the virtual twin analysis function is also provided at the terminal of the expert meeting room of the power plant, and the virtual twin analysis function is also provided at the terminal of the office of the maintenance planning engineer of the power plant.
Referring to fig. 8, a schematic diagram of a single-operation dual-machine operation mode of the virtual twin system operated by the power plant is shown. The virtual twin system for power plant operation designed by the invention realizes distributed multi-task networked operation, and is designed to receive the operation of a virtual control human-computer interface of training personnel, the operation of a virtual control human-computer interface of maintenance planning personnel, and the input of a single operation double machine of a real control system DCS human-computer interface and a virtual control system human-computer interface of a power plant on duty by the operation personnel of the power plant, so that the effects of on-site teaching and operation evaluation are obtained. The operation of the single-operation double-machine is that a set of mouse and keyboard of an operator in a power plant is connected with a real DCS and two human-machine interface workstations of a virtual control system, and operation signals are respectively sent to the DCS and the virtual twin system, so that the real operation and the virtual operation are different. The on-duty power plant operation operators only observe a real DCS man-machine interface screen, and the man-machine interface of the virtual control system can be operated and evaluated by a coach or a maintenance planning person due to the observed virtual twin calculation result, and can take over the predictive operation of the virtual twin mathematical model at any time.
Referring to fig. 9, a schematic diagram of a reverse data-driven operation of the virtual twin system for power plant operation is shown. The system can realize reverse data driving, virtual twin data are guided to a real-time/historical database RTDB system of a power plant to become another set of virtual twin data sources of the RTDB except a DCS interface source, and the two data sources are in a mapping relation which can be in one-to-one correspondence with the point name definition, so that all monitoring functions, calculation functions, analysis functions, evaluation functions, test functions, management functions and the like which the RTDB has can be transferred to the virtual twin system without change.
Example 2: in order to deepen the understanding of the invention, the detailed description is made on the embodiments in combination with the building of each module of the mathematical model of the virtual twin system.
The invention provides a virtual twin single-phase fluid node mathematical model for establishing a power plant operation, wherein input variables are pressure and temperature, an immutable parameter is a node volume coefficient, and an immeasurable output is a specific volume, an enthalpy, an entropy and the like.
The invention provides a method for establishing a virtual twin single-phase fluid network mathematical model for power plant operation, inputting flow control variables of various network devices, such as valve positions, pump rotating speeds, fan blade angles and the like, and outputting the flow control variables to various node pressures in a measurable mode.
The invention provides a mathematical model for establishing a virtual twin single-phase fluid pipeline for operating a power plant, wherein input variables are inlet pressure, inlet temperature and outlet pressure, non-variable parameters are pipeline physical size, friction coefficient, heat dissipation coefficient and the like, variable parameters are pipeline scaling coefficient, measurable output is outlet temperature, and non-measurable output is pipeline flow, inlet and outlet specific volume, enthalpy, entropy and the like.
The invention provides a mathematical model for establishing a virtual twin combustor for power plant operation, wherein input variables are fuel and air inlet pressure, inlet temperature and combustor pressure, invariable parameters are combustor physical size and the like, variable parameters are combustion heat release value, combustor fouling coefficient and the like, measurable outputs are combustor flame temperature and flue gas temperature, and unmeasured outputs are fuel quantity, air quantity, flue gas quantity, specific volume inlet and outlet, enthalpy and the like.
The invention provides a method for establishing mathematical models of a heat exchange surface superheater reheater and the like of a virtual twin boiler operated by a power plant, wherein input variables are steam drum pressure, outlet pressure in a pipe, hearth pressure, flue gas temperature and tail flue pressure, unchangeable parameters are physical size of a heat exchange surface and the like, changeable parameters are flue gas fouling coefficient and the like, and the variables can be measured and output as burner flame temperature and flue gas temperature, and the unchangeable parameters can be measured and output as flue gas heat exchange value, flue gas amount, specific volume of flue gas and inlet and outlet in the pipe, enthalpy and the like.
The invention provides a method for establishing a power plant operation virtual twin turbine mathematical model, wherein input variables are main steam pressure, main steam temperature, regulating stage pressure and temperature, pressure and temperature of each stage group and exhaust steam pressure, unchangeable parameters are physical size, through-flow coefficient and the like of the turbine, changeable parameters are stage group loss coefficient and the like, the output can be measured as turbine work and exhaust steam humidity, and the output can be measured as turbine efficiency, steam extraction quantity of each stage group, steam extraction specific volume, enthalpy and the like.
The invention provides a mathematical model for establishing a virtual twin valve for power plant operation, wherein input variables comprise inlet pressure, inlet temperature, outlet pressure, valve position, switch state and the like, non-variable parameters comprise valve physical size, friction coefficient and the like, variable parameters comprise valve scaling coefficient, measurable output comprises outlet temperature, and non-measurable output comprises valve flow, inlet and outlet specific volume, enthalpy, entropy and the like.
The invention provides a method for establishing a power plant operation virtual twin pump mathematical model, wherein input variables are inlet pressure, inlet temperature, outlet pressure, start-stop state and mechanical shaft rotation speed, invariable parameters are pump physical size, friction loss coefficient and the like, variable parameters are pump head formula coefficient, efficiency formula coefficient, scaling coefficient and the like, measurable output is outlet temperature, and unmeasurable output is working medium flow, inlet-outlet specific volume, enthalpy, entropy and the like of a pump.
The invention provides a mathematical model for establishing a virtual twin fan for operating a power plant, wherein input variables are inlet pressure, inlet temperature, outlet pressure, start-stop state and mechanical rotating speed, invariable parameters are physical size, friction loss coefficient and the like of the fan, variable parameters are fan wind pressure formula coefficient, efficiency formula coefficient, scaling coefficient and the like, measurable output is outlet temperature, and unmeasured output is working medium flow, inlet and outlet specific volume, enthalpy, entropy and the like of the fan.
The invention provides a mathematical model for establishing a virtual twin feed water heater for power plant operation, wherein input variables are feed water inlet pressure and temperature, feed water outlet pressure, steam extraction pipeline pressure and temperature, drain pipeline inlet pressure and temperature, drain pipeline outlet pressure, and non-variable parameters are physical dimensions of a heat exchange surface of the heater, variable parameters are pollution coefficients, resistance coefficients and the like of the heat exchange surface, the input variables can be measured and output as feed water outlet temperature and drain temperature, and the non-variable parameters can be measured and output as steam extraction heat exchange value, steam extraction amount, inlet and outlet specific volume, enthalpy and the like in a steam extraction pipe.
The invention provides a mathematical model for establishing a power plant operation virtual twin feed condenser, wherein input variables are circulating water inlet pressure and temperature, circulating water outlet pressure, exhaust port vacuum, drain pipeline inlet pressure and temperature, condensed water pipeline outlet pressure, and non-variable parameters are physical dimensions of a heat exchange surface of the condenser, the variable parameters are a pollution coefficient, a resistance coefficient and the like of the heat exchange surface, the output can be measured as the circulating water outlet temperature, and the non-variable parameters are a heat exchange value, a condensed water amount, dryness, specific volume, enthalpy and the like of the condenser.
The invention provides a mathematical model for establishing a virtual twin feed deaerator for power plant operation, wherein input variables are condensed water inlet pressure and temperature, feed water outlet pressure, drain pipe inlet pressure and temperature, and non-variable parameters are physical size of a deaerator heat exchange surface and the like, variable parameters are pollution coefficient, resistance coefficient and the like, the output can be measured as feed water outlet temperature, and the non-variable parameters are deaerator heat exchange value, steam extraction amount, inlet and outlet specific volume in a steam extraction pipe, enthalpy and the like.
The invention provides a mathematical model for establishing a virtual twin compressor turbine for power plant operation, wherein input variables are ambient air pressure, ambient air temperature, mechanical rotating speed of a compressor and outlet pressure of the compressor, non-variable parameters are physical size, pressure ratio, flow surface coefficient, working characteristic curve of the compressor and the like of the compressor, variable parameters are loss coefficients of blade stages and the like, and the non-variable parameters can be measured and output as power consumption and outlet temperature of the compressor and the non-measured output as efficiency, specific volume, enthalpy and the like of the compressor at each stage.
The invention provides a method for establishing a power plant operation virtual twin gas turbine mathematical model, wherein input variables are gas inlet pressure, flue gas temperature, mechanical rotating speed of the gas turbine and exhaust outlet pressure, the unchangeable parameters are physical size, pressure drop ratio, flow surface coefficient, working characteristic curve of a gas compressor and the like of a gas turbine, the variable parameters are blade-level loss coefficient and the like, the measurable output is gas turbine work, exhaust outlet temperature, the unchangeable output is gas turbine efficiency, gas specific volume, enthalpy and the like.
Claims (10)
1. A virtual twin system VDT (virtual Digital twin) for power plant operation is characterized in that the virtual twin system for power plant operation can be a power plant analysis and simulation system which can realize network tight Data interconnection with a power plant Control system DCS (distributed Control System) and a power plant Real-Time/history database system RTDB (Real-Time Data Base), and the virtual twin system for power plant operation comprises a virtual Control system, a power plant equipment virtual twin mathematical model system and a simulation analysis function system.
2. The power plant operation virtual twin system according to claim 1, characterized in that data-driven power plant virtual twin mathematical model modeling strictly limits the number of initial conditions IC (initial condition) of the mathematical model system, the number of initial conditions IC points of the virtual twin system is equal to or less than the number of points that the real-time/historical database RTDB can transmit, that is, equal to or less than all input/output I/O points defined by the power plant control system DCS, and the definition of the initial conditions IC points of the virtual twin system is completely consistent with the definition of the I/O points of the RTDB and the DCS.
3. The power plant operation virtual twin system according to claim 2, characterized in that a load Set function module of the power plant operation virtual twin system directly loads a real-time data slice of RTDB as an initial condition of virtual twin to start simulation operation, a heavy load Reset function of the power plant operation virtual twin system has three sources selected as the initial condition of virtual twin simulation, one is Backtrack for loading the virtual twin system to automatically store IC, the other is Snapshot for loading the virtual twin system to manually store IC, and the other is Historan for loading the RTDB at a certain time history data packet IC.
4. The power plant operation virtual twin system of claim 3, comprising a return tracking backup function module, a Replay function module, an automatic storage Auto IC function module, and a Manual storage Manual IC function module of a simulation analysis function.
5. The power plant operation virtual twin system according to claim 4, wherein the power plant operation virtual twin system comprises an operation Run function module, a modeling Make function module, a freezing Freeze function module and a Stop function module, wherein the operation Run function module of the power plant operation virtual twin system is a function of performing simulation calculation; the invention relates to a modeling Make functional module of a power plant operation virtual twin system, which is characterized in that the model parameter calculation function is carried out; a freezing Freeze function module of the virtual twin system operated by the power plant is a freezing calculation function; and the Stop function module of the virtual twin system operated by the power plant is used for stopping the calculation function.
6. The power plant operation virtual twin system of claim 5, wherein the power plant equipment virtual twin mathematical model module data defines including variables and parameters, wherein the variables include input variables, intermediate variables, output variables; the parameters comprise determined parameters and variable parameters; the output variables include measurable output variables and non-measurable output variables.
7. The power plant operation virtual twin system according to claim 6, wherein the power plant equipment virtual twin mathematical model module is built and programmed in a unified manner, and input variables of the module are strictly defined as only measurable interface points of pressure, temperature, flow, liquid level, rotation speed, valve position, current, voltage, power, switch state and the like from a real-time/historical database (RTDB) are taken as module input variables; any intermediate calculated quantity, unmeasured calculated quantity and engineering empirical formula identification quantity can not be used as input variables of the virtual twin mathematical model module, and mathematical model formula programs in the module are substituted into the input variables, the calculation parameters and the like, so that various output variables can be strictly calculated; all input variables and measurable output variables of the module are consistent with the point table transmitted by the RTDB by contrasting the point table of the RTDB, and can be recorded and stored as simulation operation.
8. The power plant operation virtual twin system according to claim 7, wherein the power plant equipment virtual twin mathematical model module is programmed by adopting a double calculation function system, wherein one is a simulation calculation function, the other is a parameter calculation function, and the mode of the simulation calculation function is to calculate an output variable from an input variable and a parameter; the mode of the parameter calculation function is that variable parameters are calculated by input variables, determined parameters and measurable output variables, the simulation calculation function is called by a Run function, and the parameter calculation function is called by a Make function.
9. The power plant operation virtual twin system according to claim 8, wherein the power plant operation virtual twin system executes Run function module, performs simulation calculation function, starts from IC point of Set or Reset, and completely simulates operation, and receives virtual DCS operation, fault insertion, local operation, and environmental parameter change, wherein Reset of Set or RTDB data is driven by real-time or historical power plant data to start simulation calculation.
10. The power plant operation virtual twin system according to claim 9, wherein the power plant operation virtual twin system performs a modeling Make function module, performs a parameter calculation function, and starts from a Set current point and continuously performs Set from an RTDB sequence; or starting from the IC point of Reset, continuously executing Reset from the RTDB sequence, and continuously calculating variable parameters, namely performing parameter calculation driven by the data of the power plant.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114089708A (en) * | 2021-11-19 | 2022-02-25 | 江苏科技大学 | Offshore power generation platform management system based on digital twin and optimization regulation and control method thereof |
| CN114280955A (en) * | 2021-11-18 | 2022-04-05 | 南方电网调峰调频发电有限公司 | Intelligent hydraulic power plant system based on domain information model and digital twin and architecture method |
| CN114707334A (en) * | 2022-04-08 | 2022-07-05 | 西安交通大学 | Twin model operation method of coal mill |
| CN115074158A (en) * | 2022-06-21 | 2022-09-20 | 湖南工商大学 | Coal gasification technical process safety early warning system based on digital twinning |
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| CN114280955A (en) * | 2021-11-18 | 2022-04-05 | 南方电网调峰调频发电有限公司 | Intelligent hydraulic power plant system based on domain information model and digital twin and architecture method |
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| CN114089708A (en) * | 2021-11-19 | 2022-02-25 | 江苏科技大学 | Offshore power generation platform management system based on digital twin and optimization regulation and control method thereof |
| CN114089708B (en) * | 2021-11-19 | 2024-03-26 | 江苏科技大学 | Digital twinning-based offshore power generation platform management system and optimization regulation and control method thereof |
| CN114707334A (en) * | 2022-04-08 | 2022-07-05 | 西安交通大学 | Twin model operation method of coal mill |
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| CN115074158A (en) * | 2022-06-21 | 2022-09-20 | 湖南工商大学 | Coal gasification technical process safety early warning system based on digital twinning |
| CN115074158B (en) * | 2022-06-21 | 2023-05-02 | 湖南工商大学 | Coal gasification technical process safety precaution system based on digital twinning |
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