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CN-121996961-A - Digital twin mapping system of PEM (PEM) electrolytic water hydrogen production equipment

CN121996961ACN 121996961 ACN121996961 ACN 121996961ACN-121996961-A

Abstract

The invention relates to the technical fields of industrial automation control, digital process control systems and digital twins, and discloses a digital twins mapping system of PEM (PEM) water electrolysis hydrogen production equipment, which comprises a data acquisition module, a control module and a control module, wherein the data acquisition module acquires a shaft load signal, a fluid pressure signal and a thermal state signal of a controlled superposition entity; the invention relates to a fluid load decoupling unit, which comprises a fluid load decoupling unit, a topology mapping engine, a digital twin model updating module and a digital twin model prediction module, wherein the fluid load decoupling unit calculates a fluid expansion force component according to a pressure signal, deducts the component from an axial load signal to extract a solid load characteristic quantity, the topology mapping engine performs mapping operation on the solid load characteristic quantity and a thermal state signal based on stiffness topology logic to generate an internal microscopic stress distribution map, the digital twin model updating module synchronously corrects the physical attribute of a mapping model based on the map, and outputs a damage diagnosis result according to the map evolution characteristic.

Inventors

  • Yu Jiehuan
  • Zhong Shangyan

Assignees

  • 四川欧米纳科技有限公司

Dates

Publication Date
20260508
Application Date
20260121

Claims (10)

  1. 1. A digital twin mapping system for a PEM electrolyzed water hydrogen plant, the system comprising: the data acquisition module is used for acquiring a load signal of an axial constraint unit in the controlled superposition entity, a pressure representation signal of an internal fluid chamber and a thermal state signal of a core area; The fluid load decoupling unit is connected with the data acquisition module and is used for calculating nonlinear expansion force components generated by fluid in operation of the controlled superposition entity according to the pressure characterization signal and subtracting the nonlinear expansion force components from the loaded signal so as to extract solid load characteristic quantities for characterizing the contact state of the multilayer superposition structure in the controlled superposition entity; The topology mapping engine is used for carrying out nonlinear association calculation on the solid load characteristic quantity and the thermal state signal based on a preset longitudinal stiffness topology logic to generate a spatial distribution map of the microcontact stress field in the controlled superposition entity in the three-dimensional space dimension; And the digital twin model updating module is used for synchronously correcting physical properties of the mapping model in the virtual space based on the spatial distribution spectrum and outputting a diagnosis logic result aiming at internal stress relaxation or structural damage of the controlled superposition entity based on monotonic offset of the spatial distribution spectrum on a continuous time sequence.
  2. 2. The digital twin mapping system of a PEM water electrolysis hydrogen plant according to claim 1 further comprising a spatially resolved diagnostic module for extracting dynamic pulse features from the pressure characterization signal and identifying phase delay parameters and amplitude decay parameters of the dynamic pulse features as they are conducted within the controlled superposition entity, the spatially resolved diagnostic module further for deep level resolving the spatial distribution map with the phase delay parameters and the amplitude decay parameters to determine structural steady state within the controlled superposition entity corresponding to physical depth.
  3. 3. The digital twin mapping system of a PEM electrolyzed water hydrogen plant of claim 1 further comprising a seal degradation evaluation module, wherein the seal degradation evaluation module is configured to record the load signal and the axial displacement deformation of the axial restraint unit under pressure cycling conditions of the controlled lamination entity and to construct a dynamic hysteresis loop of the load signal and the axial displacement deformation, and wherein the seal degradation evaluation module is further configured to calculate an envelope area of the dynamic hysteresis loop and extract an energy dissipation index of the elastic seal unit inside the controlled lamination entity based on the envelope area to identify a modulus drift state of the elastic seal unit.
  4. 4. A digital twin mapping system for a PEM water electrolysis hydrogen plant according to claim 3 wherein the seal degradation assessment module, when calculating the envelope area of the dynamic hysteresis loop, performs the following operational logic: , wherein, Is the envelope area of the dynamic hysteresis loop, and the unit is ; Is a solid load characteristic quantity, and has the unit of ; Is the axial displacement deformation quantity of the axial restraint unit, and has the unit of 。
  5. 5. The digital twin mapping system of a PEM electrolyzed water hydrogen plant of claim 1 further comprising an active probing diagnostic module for taking the operating current of the controlled superposition entity as a thermal excitation input, triggering microscopic thermal expansion of the controlled superposition entity by ohmic thermal effects generated by the operating current, and for monitoring the rate of change of the load signal with the microscopic thermal expansion and comparing the rate of change with a preset healthy stiffness response gradient to locate local stiffness outliers inside the controlled superposition entity and feeding the local stiffness outliers back to the digital twin model update module to modify local modulus parameters of the mapping model.
  6. 6. The digital twin mapping system of a PEM water electrolysis hydrogen plant of claim 1 further comprising an environmental bias correction module for acquiring humidity data and barometric pressure data of the operating environment and identifying measurement bias of the humidity data and barometric pressure data on the loaded signal, the environmental bias correction module further for removing the measurement bias from the loaded signal to maintain the mapping stability of the digital twin model under different operating environment conditions.
  7. 7. A digital twin map system for a PEM electrolyzed water hydrogen plant according to claim 1 wherein the fluid load decoupling unit, when calculating the nonlinear expansion force component, is further configured to acquire a fluid flow rate signal within the internal fluid chamber and to correct dynamic pressure disturbances resulting from fluid kinetic energy conversion based on the fluid flow rate signal.
  8. 8. The digital twin mapping system of the PEM water electrolysis hydrogen production equipment according to claim 1, wherein the controlled superposition entity internally accompanies a gas-liquid mixed flow generated by electrolysis hydrogen production, the topology mapping engine is further integrated with a stress fluctuation compensation algorithm, and the stress fluctuation compensation algorithm is used for calculating equivalent modulus fluctuation of the mapping model under the impact of the gas-liquid mixed flow according to the gas phase volume fraction in the gas-liquid mixed flow and correcting a space distribution map by utilizing the equivalent modulus fluctuation.
  9. 9. The digital twin mapping system of PEM water electrolysis hydrogen production equipment according to claim 1, further comprising a life trend prediction module, wherein the life trend prediction module is used for accumulating stress circulation frequency of a spatial distribution map in a controlled superposition entity operation period and generating a structural health evolution path of a mapping model by combining gradient distribution of thermal state signals.
  10. 10. The digital twin mapping system for PEM water electrolysis hydrogen production equipment of claim 9 further comprising a maintenance decision feedback module for generating a maintenance pre-warning signal based on the real-time state of the mapping model when the absolute value of the derivative of the structural health evolution path exceeds a preset abrupt performance threshold and sending the maintenance pre-warning signal as a feedback input to the control terminal of the controlled superposition entity.

Description

Digital twin mapping system of PEM (PEM) electrolytic water hydrogen production equipment Technical Field The invention belongs to the technical fields of industrial automation control, digital process control systems and digital twinning, and particularly relates to a digital twinning mapping system of PEM (PEM) water electrolysis hydrogen production equipment. Background In the prior art, a state mapping model of a physical entity is built in a virtual space by collecting operation data such as bus voltage, working current, circulating medium temperature and system pressure and the like to execute hydrogen production efficiency evaluation and operation life prediction, however, a high-power and high-pressure electrolytic tank is formed by hundreds of layers of polar plates and membrane electrodes to form a superposition entity, the superposition entity is subjected to complex thermal stress circulation and fluid pressure fluctuation in the operation process, so that nonlinear dynamic drift is generated in a structural rigidity chain, the physical complexity of the superposition structure greatly limits the directness of state perception, while the superposition process optimization of a hardware layer relieves the stress non-uniformity to a certain extent, the precise dynamic response to the coupling working condition of a complex physical field is realized, the purely hardware improvement is difficult to succeed, and a digital modeling means is combined to seek from a control logic layer, for example, the Chinese patent with an authority bulletin number of CN117252032B discloses a digital twin body construction method, device and equipment of an alkaline electrolytic water hydrogen production system, and simulation mapping of system operation parameters is realized by integrating an electrochemical mechanism, a thermal equilibrium equation and a dynamic model, so that the simulation of the system has positive significance for evaluating energy consumption. However, the method is more focused on the statistical deduction of external working condition data, for a precise structural body such as a PEM electrolytic tank, wherein the precise structural body is internally accompanied with high-pressure fluid wedge expansion and material creep coupling, the model construction of the precise structural body still stays in a mathematical fitting stage of macroscopic characteristics, the mechanism inversion logic between a fastening load and the internal active area contact pressure cannot be deeply excavated, the conventional mapping scheme is more dependent on the statistical fitting of external operation parameters, the fastening system load cannot be accurately decoupled into the microcosmic contact distribution of the internal active area due to lack of perception of the inherent mechanical characteristics of a physical structure, the modeling mode based on data association enables the system to generate a cognitive blind area under a thermal steady state, the digital twin mapping system is caused to generate serious virtual-actual synchronous drift under complex physical field coupling, the local current density abnormality or sealing failure risk induced by internal stress reconstruction cannot be effectively identified, the confidence of the control terminal on the physical entity state perception is reduced, the precise closed loop cooperation between the digital twin model and a process control command is difficult to realize, and for the challenge, the physical rigidity characteristic cannot be accurately decoupled by simply increasing the number of an external sensor or improving the data sampling frequency, the traditional parameter fitting path is difficult to maintain the full life cycle due to the fact that the boundary is ignored and the boundary state is difficult to be coupled with the electrochemical state. Therefore, how to construct a digital twin mapping system capable of accurately inverting the contact pressure distribution of the active area of the electrolytic cell, realize non-invasive sensing of the compression state of the membrane electrode, and further provide feedback input with high confidence for an automatic control program, and become the technical problem to be solved by the invention. Disclosure of Invention The invention provides a digital twin mapping system of PEM electrolytic water hydrogen production equipment, which comprises: the data acquisition module is used for acquiring a load signal of an axial constraint unit in the controlled superposition entity, a pressure representation signal of an internal fluid chamber and a thermal state signal of a core area; The fluid load decoupling unit is connected with the data acquisition module and is used for calculating nonlinear expansion force components generated by fluid in operation of the controlled superposition entity according to the pressure characterization signal and subtracting the nonlinear expansion force compone