A nodal dynamic model for control system design and simulation of an MHTGR core

Dong, Zhe; Huang, Xiaojin; Liangju, Zhang

doi:10.1016/j.nucengdes.2009.12.032

Cited by 57 publications

(33 citation statements)

References 19 publications

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“…The dynamic model of the MHTGR that is used for numerical simulation is the nodal model given in [22]. The OTSG model adopted the moving boundary model given in [23].…”

Section: Simulation Results With Discussionmentioning

confidence: 99%

“…The code was developed based on VC++ [24], and this simulation was done by using this software. Actually, both the space-dependent reactor models given in [22,23] and point model Equation (1) can describe the NSSS dynamics. The former one gives a more detailed description and is more suitable for verification, and the later model is much simpler and is more suitable for control law design.…”

Section: Simulation Results With Discussionmentioning

confidence: 99%

“…However, due to the mismatch between the real and designed NSSS parameters as well as that between the dynamic features of the real and Furthermore, the parameters of the NSSS models for control design and simulation are given by physical and thermal-hydraulic design. It was verified that the model and software given in [22][23][24] can provide credible dynamical simulation for the HTR-PM plant. The theoretical and simulation results in this paper show at least that the coordinated control law determined by Equations (16), (31) and (32) can be implemented in the practical engineering.…”

mentioning

confidence: 78%

“…It was verified that the model and software given in [22][23][24] can provide credible dynamical simulation for the HTR-PM plant. The theoretical and simulation results in this paper show at least that the coordinated control law determined by Equations (16), (31) and (32) can be implemented in the practical engineering.…”

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confidence: 78%

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Model-Free Coordinated Control for MHTGR-Based Nuclear Steam Supply Systems

Dong

2016

Energies

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Abstract:The modular high temperature gas-cooled reactor (MHTGR) is a typical small modular reactor (SMR) that offers simpler, standardized and safer modular design by being factory built, requiring smaller initial capital investment, and having a shorter construction period. Thanks to its small size, the MHTGRs could be beneficial in providing electric power to remote areas that are deficient in transmission or distribution and in generating local power for large population centers. Based on the multi-modular operation scheme, the inherent safety feature of the MHTGRs can be applicable to large nuclear plants of any desired power rating. The MHTGR-based nuclear steam supplying system (NSSS) is constituted by an MHTGR, a side-by-side arranged helical-coil once-through steam generator (OTSG) and some connecting pipes. Due to the side-by-side arrangement, there is a tight coupling effect between the MHTGR and OTSG. Moreover, there always exists the parameter perturbation of the NSSSs. Thus, it is meaningful to study the model-free coordinated control of MHTGR-based NSSSs for safe, stable, robust and efficient operation. In this paper, a new model-free coordinated control strategy that regulates the nuclear power, MHTGR outlet helium temperature and OTSG outlet overheated steam temperature by properly adjusting the control rod position, helium flowrate and feed-water flowrate is established for the MHTGR-based NSSSs. Sufficient conditions for the globally asymptotic closed-loop stability is given. Finally, numerical simulation results in the cases of large range power decrease and increase illustrate the satisfactory performance of this newly-developed model-free coordinated NSSS control law.

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“…The dynamic model of the MHTGR that is used for numerical simulation is the nodal model given in [22]. The OTSG model adopted the moving boundary model given in [23].…”

Section: Simulation Results With Discussionmentioning

confidence: 99%

Section: Simulation Results With Discussionmentioning

confidence: 99%

mentioning

confidence: 78%

mentioning

confidence: 78%

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Model-Free Coordinated Control for MHTGR-Based Nuclear Steam Supply Systems

Dong

2016

Energies

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“…For compensating control input saturation, an expanded state-variable ef is introduced, which satisfies differential Equation (21) and where scalar eg is given by Equation (20). Moreover, set: …”

Section: Remarkmentioning

confidence: 99%

Saturated Adaptive Output-Feedback Power-Level Control for Modular High Temperature Gas-Cooled Reactors

Dong

2014

Energies

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Small modular reactors (SMRs) are those nuclear fission reactors with electrical output powers of less than 300 MWe. Due to its inherent safety features, the modular high temperature gas-cooled reactor (MHTGR) has been seen as one of the best candidates for building SMR-based nuclear plants with high safety-level and economical competitive power. Power-level control is crucial in providing grid-appropriation for all types of SMRs. Usually, there exists nonlinearity, parameter uncertainty and control input saturation in the SMR-based plant dynamics. Motivated by this, a novel saturated adaptive output-feedback power-level control of the MHTGR is proposed in this paper. This newly-built control law has the virtues of having relatively neat form, of being strong adaptive to parameter uncertainty and of being able to compensate control input saturation, which are given by constructing Lyapunov functions based upon the shifted-ectropies of neutron kinetics and reactor thermal-hydraulics, giving an online tuning algorithm for the controller parameters and proposing a control input saturation compensator respectively. It is proved theoretically that input-to-state stability (ISS) can be guaranteed for the corresponding closed-loop system. In order to verify the theoretical results, this new control strategy is then applied to the large-range power maneuvering control for the MHTGR of the HTR-PM plant. Numerical simulation results show not only the relationship between regulating performance and control input saturation bound but also the feasibility of applying this saturated adaptive control law practically. OPEN ACCESSEnergies 2014, 7 7621

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Molten salts: Potential candidates for thermal energy storage applications

Bhatnagar

Siddiqui

Sreedhar

et al. 2022

Intl J of Energy Research

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Summary Molten salts as thermal energy storage (TES) materials are gaining the attention of researchers worldwide due to their attributes like low vapor pressure, non‐toxic nature, low cost and flexibility, high thermal stability, wide range of applications etc. This review presents potential applications of molten salts in solar and nuclear TES and the factors influencing their performance. Ternary salts (Hitec salt, Hitec XL) are found to be best suited for concentrated solar plants due to their lower melting point and higher efficiency. Two‐tank direct energy storage system is found to be more economical due to the inexpensive salts (KCl‐MgCl2), while thermoclines are found to be more thermally efficient due to the power cycles involved and the high volumetric heat capacity of the salts involved (LiF‐NaF‐KF). Heat storage density has been given special focus in this review and methods to increase the same in terms of salt composition changes are discussed in the paper. Methods of concatenating energy storage systems with nuclear power plants are also discussed with different types of nuclear reactors like MHTGR, PAHTR, VHTR, etc. Nanomodifications of molten salts are done to improve heat transfer properties and efficiency of the transfer. The best dopants for such modifications were found to be TiO2, SiO2, MWCNTs, etc. Future challenges for large scale deployment of molten salts viz., high volume expansion ratio, low thermal conductivity, incongruent melting, corrosion, etc., are listed and discussed. Corrosion of molten salts and its mitigation has been discussed in detail for developing next‐generation storage systems and its remedies are also discussed.

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A nodal dynamic model for control system design and simulation of an MHTGR core

Cited by 57 publications

References 19 publications

Model-Free Coordinated Control for MHTGR-Based Nuclear Steam Supply Systems

Model-Free Coordinated Control for MHTGR-Based Nuclear Steam Supply Systems

Saturated Adaptive Output-Feedback Power-Level Control for Modular High Temperature Gas-Cooled Reactors

Molten salts: Potential candidates for thermal energy storage applications

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