Jun Shen

Chinese Academy of Sciences

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Zhaojun Mo

Guangxi Center for Disease Prevention and Control

Baogen Shen

University of Chinese Academy of Sciences

Zhenxing Li

China University of Petroleum, Beijing

Fengxia Hu

Chinese Academy of Sciences

Xinqiang Gao

Chinese Academy of Sciences

Jirong Sun

Chinese Academy of Sciences

Guochun Zhang

Technical Institute of Physics and Chemistry

Heng Tu

Chinese Academy of Sciences

Maoqiong Gong

University of Chinese Academy of Sciences

Jirong Sun

University of Chinese Academy of Sciences

Cooperative Institutions

Chinese Academy of Sciences

227

University of Chinese Academy of Sciences

109

Institute of Physics

Technical Institute of Physics and Chemistry

University of Science and Technology Beijing

University of Science and Technology of China

Beijing Institute of Technology

Nanjing University

Tsinghua University

Hebei University of Technology

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An Improved Adaptive Coordination Control of Wind Integrated Multi-Terminal HVdc System

IEEE Transactions on Power Electronics (2022)

Qingqing Yang Jun Shen Jianwei Li Hongwen He Zhongbao Wei

The increasing penetration of the renewables and integration of the power electronic devices leads to lower system inertia, which is changeling the system stability of a multiterminal HVdc (MTdc) system. This article presents an improved adaptive predictive control with the multiobjective targets coordinating the key parameters that the dc voltage, ac frequency and power-sharing among the terminals in MTdc system. Specifically, we contribute two main points to the relevant literature, with the purpose of distinguishing our study from existing ones. First, the proposed method is based on minimal information exchange by only considering neighboring terminals. Second, the adaptive control is achieved by setting a weighted fitness function to adaptively tune the weights with the effective integration of the trust-region and particle swarm optimization. A four-terminal HVdc system built within the IEEE 30-bus ac system is used as the study case to validate the robustness and efficiency of the proposed method. In the case study regarding the multiobjective fitness function, the proposed approach benefits in suppressing the voltage deviation, providing frequency support and establishing an automatically updated power equilibrium leveraging by the adaptive parameters.

Robustness

Frequency deviation

High-voltage direct current

10.1109/tpel.2022.3228949

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Citations (8)

Large reversible magnetocaloric effects in ErFeSi compound under low magnetic field change around liquid hydrogen temperature

Applied Physics Letters (2013)

H. Zhang Baogen Shen Zhiyi Xu Jun Shen Fengxia Hu

Magnetic properties and magnetocaloric effects (MCEs) of ternary intermetallic ErFeSi compound have been investigated in detail. It is found that ErFeSi exhibits a second-order magnetic transition from ferromagnetic to paramagnetic states at the Curie temperature TC = 22 K, which is quite close to the liquid hydrogen temperature (20.3 K). A thermomagnetic irreversibility between zero-field-cooling and field-cooling curves is observed below TC in low magnetic field, and it is attributed to the narrow domain wall pinning effect. For a magnetic field change of 5 T, the maximum values of magnetic entropy change (−ΔSM) and adiabatic temperature change (ΔTad) are 23.1 J/kg K and 5.7 K, respectively. Particularly, the values of −ΔSM and refrigerant capacity reach as high as 14.2 J/kg K and 130 J/kg under a magnetic field change of 2 T, respectively. The large MCE without hysteresis loss for relatively low magnetic field change suggests that ErFeSi compound could be a promising material for magnetic refrigeration of hydrogen liquefaction.

Magnetic refrigeration

Thermomagnetic convection

Néel temperature

10.1063/1.4794415

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Citations (129)

Temperature dependence of magnetization reversal mechanism in misch-metal substituted Nd-Fe-B magnets sintered by dual alloy method

Acta Materialia (2023)

Dan Liu Jie-Fu Xiong Lichen Wang Xinqi Zheng Fei Peng

10.1016/j.actamat.2023.118710

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Citations (19)

Observation of giant magnetocaloric effect in EuTiO3

Materials Letters (2015)

Zhaojun Mo Jun Shen Lan Li Yao Liu Chengchun Tang

Magnetic refrigeration

Hysteresis

Thermal hysteresis

10.1016/j.matlet.2015.06.040

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Citations (45)

Giant low-field magnetic refrigeration in EuTi1−xAlxO3 (x = 0.05, 0.1 and 0.15) compounds

Journal of Magnetism and Magnetic Materials (2019)

Wei Zhang Zhaojun Mo Wenhao Jiang Zhihong Hao Jiawei Luo

Magnetic refrigeration

10.1016/j.jmmm.2019.165684

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Citations (11)

Magnetic properties and magnetocaloric effects in Er _{1 − x} Gd _x CoAl intermetallic compounds

Chinese Physics B (2015)

Xinqiang Gao Zhaojun Mo Jun Shen Ke Li Wei Dai

The magnetism and magnetocaloric effect in Er1 − xGdxCoAl (x = 0, 0.1, 0.2, 0.4, 0.6, 0.8, 1) were investigated. The Er1 − xGdxCoAl compounds were synthesized by arc melting. With the increasing Gd content, the Neel temperature (TN) linearly increases from 14 K to 102 K, while the magnetic entropy change (−ΔSM) tends to decrease nonmonotonously. Under the field change from 0 T to 5 T, the −ΔSM of the compounds with x = 0.2–1 are stable around 10 J/kg K, then a cooling platform between 20 K and 100 K can be formed by combining these compounds. For x = 0.6, 0.8, 1.0, the compounds undergo two successive magnetic transitions, one antiferromagnetism to ferromagnetism and the other ferromagnetism to paramagnetism, with increasing temperature. The two continuous magnetic transitions in this series are advantageous to broaden the temperature span of half-peak width (δT) in the −ΔSM−T curve and improve the refrigeration capacity.

Magnetic refrigeration

Néel temperature

Magnetism

Ferrimagnetism

Metamagnetism

Arc melting

10.1088/1674-1056/24/9/097502

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Citations (0)

Magnetic entropy change and refrigerant capacity in GdFeAl compound

Journal of Applied Physics (2009)

Q. Y. Dong Baogen Shen J. Chen Jun Shen Huawei Zhang

Magnetic properties and magnetocaloric effect of GdFeAl compound have been investigated. The small saturated magnetization of GdFeAl compound is caused by the antiferromagnetic coupling between the magnetic moments of Gd and Fe atoms. A second-order magnetic phase transition is confirmed around 265K. The maximum magnetic entropy change for GdFeAl compound is 3.7Jkg−1K−1 under the field change of 0–5T. However, a large refrigerant capacity of 420Jkg−1 is obtained, which is due to the large full width at half peak of the magnetic entropy change versus temperature curve in GdFeAl compound.

Magnetic refrigeration

10.1063/1.3059372

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Citations (31)

Giant low-field cryogenic magnetocaloric effect in polycrystalline LiErF₄ compound

Chinese Physics B (2022)

Zhaojun Mo Jianjian Gong Huicai Xie Lei Zhang Qi Fu

Antiferromagnetic LiErF 4 has attracted extensive attention due to its dipolar interaction domination and quantum fluctuations action. In the present work, the crystal structure, cryogenic magnetic properties, and magnetocaloric effect (MCE) of polycrystalline LiErF 4 compound are investigated. Crystallographic study shows that the compound crystallizes in the tetragonal scheelite structure with I 4 1 / a space group. It exhibits an antiferromagnetic (AFM) phase transition around 0.4 K, accompanied by a giant cryogenic MCE. At 1.3 K, the maximum values of magnetic entropy changes are 24.3 J/kg⋅K, 33.1 J/kg⋅K, and 49.0 J/kg⋅K under the low magnetic field change of 0–0.6 T, 0–1 T, and 0–2 T, respectively. The giant MCE observed above Néel temperature T N is probably due to the strong quantum fluctuations, which cause a large ratio of the unreleased magnetic entropy existing above the phase transition temperature. The outstanding low-field MCE below 2 K makes the LiErF 4 compound an attractive candidate for the magnetic refrigeration at the ultra-low temperature.

Magnetic refrigeration

Tetragonal crystal system

10.1088/1674-1056/ac65ef

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Citations (17)

Magnetic properties and magnetocaloric effects in R3Ni2 (R = Ho and Er) compounds

Applied Physics Letters (2011)

Q. Y. Dong J. Chen Jun Shen Jing Sun Baogen Shen

Magnetic and magnetocaloric properties of R3Ni2 (R = Ho and Er) compounds have been investigated. Both Ho3Ni2 and Er3Ni2 compounds undergo two successive phase transitions: spin reorientation transition and second-order ferromagnetic-paramagnetic transition. The maximal values of magnetic entropy change are achieved to be 21.7 J kg−1 K−1 for Ho3Ni2 and 19.5 J kg−1 K−1 for Er3Ni2 for a field change of 0-5 T. A large refrigerant capacity (RC) of 496 J kg−1 in the composite material is also obtained. Large reversible magnetocaloric effect and RC indicate the potentiality of R3Ni2 (R = Ho and Er) compounds as candidates for low-temperature magnetic refrigerant.

Magnetic refrigeration

10.1063/1.3643142

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Citations (71)

Measurements of bubble point pressure and saturated liquid density for ((R1234yf + R290))

The Journal of Chemical Thermodynamics (2017)

Quan Zhong Huiya Li Xueqiang Dong Haiyang Zhang Yanxing Zhao

Bubble point

Mole fraction

Propane

Vapor–liquid equilibrium

Triple point

10.1016/j.jct.2017.10.016

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Citations (13)