Joint SOC–SOP estimation method for lithium‑ion batteries based on electro‑thermal model and multi‑parameter constraints

Peijun Qin,Yanbo Che,Hongfeng Li,Yibin Cai,Mingda Jiang 전력전자학회 2022 JOURNAL OF POWER ELECTRONICS Vol.22 No.3

Accurate estimations of the state of charge (SOC) and the state of power (SOP) are required to ensure efficient and reliable utilization of Li-ion batteries. A new joint estimation method of SOC–SOP based on the electro-thermal model and multi-parameter constraints is proposed in this paper. The proposed method introduces temperature as one of the important constraints for SOP and considers the intrinsic relationship between SOC and SOP as well as the influence of voltage, temperature, and SOC on SOP estimation. First, an electro-thermal model is developed to describe the electric and thermal dynamic characteristics of a battery. Second, the battery SOC is accurately estimated by the unscented Kalman filter method. Then the state of power of the battery is predicted under the condition of multi-parameter constraints. Finally, experiments are conducted to verify the effectiveness of the proposed method. Simulation and experimental results show that this method has a high degree of estimation accuracy and is very simple to calculate. Under the DST condition, the maximum relative voltage error within the electro-thermal model is about 5%. The maximum estimation error of the peak discharge power does not exceed 5 W, and the overall average estimation error is about 1.2 W.

A NOTE ON JORDAN DERIVATIONS OF TRIVIAL GENERALIZED MATRIX ALGEBRAS

Li, Yanbo,Zheng, Chenyou Korean Mathematical Society 2017 대한수학회논문집 Vol.32 No.2

H. R. Ebrahimi Vishki et al. conjectured in [1], that if every Jordan higher derivation on a trivial generalized matrix algebra $\mathcal{G}=(A,M,N,B)$ is a higher derivation, then either M = 0 or N = 0. In this note, we will give a class of counter examples.

Hybrid nanofiltration membranes prepared by a simultaneous synthesis method for precise molecular separation

Chenwei Li,Guoying Feng,Zhiguo Yan,Shaoping Li,Man Xu,Cunwen Wang,Yanbo Li 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.116 No.-

Incorporation of nanofillers is an option to break through the trade-off of nanofiltration membranes. Inthe present work, a simultaneous synthesis method, ZIF and selective layer formed in one step, was proposedto prepare hybrid nanofiltration membrane. Co2+ ions pre-assembled on hydrolyzed polyacrylonitrile(PANH) support provided nucleation sites for ZIF-67 formation. The growth of ZIF-67 and theformation of polyethyleneimine (PEI) selective layer on the support completed in one step through codepositingof a solution of PEI and Hmim (2-methylimidazole). The feasibility of the simultaneous synthesismethod was verified by using different supports, PEIs, and the precursor concentrations. All resultsshow that ZIF-67 incorporation improved the water permenace, without significant compromising ofmembrane rejection. At an optimized condition, the obtained hybrid composite membrane showed highpermeance of 35 L/(m2*h*bar) and rejection of 93% toward PEG 200. The permeance increased by about150%–200% compared with the membrane without ZIF-67. Meanwile, the rejections of salts of the hybridmembrane were very low, exhibiting outstanding organic selectivity.

Advanced Droop Control Scheme in Multi-terminal DC Transmission Systems

Yanbo Che,Jinhuan Zhou,Wenxun Li,Jiebei Zhu,Chao Hong 대한전기학회 2018 Journal of Electrical Engineering & Technology Vol.13 No.3

Droop control schemes have been widely employed in the control strategies for Multi- Terminal Direct Current (MTDC) system for its high reliability. Under the conventional DC voltage-active power droop control, the droop slope applies a proportional relationship between DC voltage error and active power error for power sharing. Due to the existence of DC network impedance and renewable resource fluctuation, there is inevitably a DC voltage deviation from the droop characteristic, which in turn results in inaccurate control of converter’s power. To tackle this issue, a piecewise droop control with DC voltage dead band or active power dead band is implemented into controller design. Besides, an advanced droop control scheme with versatile function is proposed, which enables the converter to regulate DC voltage and AC voltage, control active and reactive power, get participated into frequency control, and feed passive network. The effectiveness of the proposed control method has been verified by simulation results.

Study on the splitting failure of the surrounding rock of underground caverns

Li, Xiaojing,Chen, Han-Mei,Sun, Yanbo,Zhou, Rongxin,Wang, Lige Techno-Press 2018 Geomechanics & engineering Vol.14 No.5

In this paper splitting failure on rock pillars among the underground caverns has been studied. The damaged structure is considered to be thin plates and then the failure mechanism of rock pillars has been studied consequently. The critical load of buckling failure of the rock plate has also been obtained. Furthermore, with a combination of the basic energy dissipation principle, generalized formulas in estimating the number of splitting cracks and in predicting the maximum deflection of thin plate have been proposed. The splitting criterion and the mechanical model proposed in this paper are finally verified with numerical calculations in FLAC 3D.

Advanced Droop Control Scheme in Multi-terminal DC Transmission Systems

Che, Yanbo,Zhou, Jinhuan,Li, Wenxun,Zhu, Jiebei,Hong, Chao The Korean Institute of Electrical Engineers 2018 Journal of Electrical Engineering & Technology Vol.13 No.3

Droop control schemes have been widely employed in the control strategies for Multi-Terminal Direct Current (MTDC) system for its high reliability. Under the conventional DC voltage-active power droop control, the droop slope applies a proportional relationship between DC voltage error and active power error for power sharing. Due to the existence of DC network impedance and renewable resource fluctuation, there is inevitably a DC voltage deviation from the droop characteristic, which in turn results in inaccurate control of converter's power. To tackle this issue, a piecewise droop control with DC voltage dead band or active power dead band is implemented into controller design. Besides, an advanced droop control scheme with versatile function is proposed, which enables the converter to regulate DC voltage and AC voltage, control active and reactive power, get participated into frequency control, and feed passive network. The effectiveness of the proposed control method has been verified by simulation results.

Simulation of Unsteady Incompressible 2D Cylinder Flow with Physics-Informed Neural Network

Hui Xiang,Yanbo Zhang,Yuanye Zhou,Tianyuan Liu,Xin Xie,Yunzhu Li,Qiao Zhao 한국전산유체공학회 2022 한국전산유체공학회 학술대회논문집 Vol.2022 No.10

The Storage Grain and Environment Modeling Based on TS-PLS

Lan Wu,Yanbo Hui,Mingyue Li 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.1

Food security is a strategic cornerstone of national security, and the food safety storage is a recognized problem. Accurate representation of grain storage environment is a fundamental premise for secure storage, which is very difficult because of the complex linkage relation between stored grain and grain storage environment. The characteristics between grain and environment, such as large time lag, two-way coupling, nonlinear, time-varying, make analysis and modeling face more difficulties and challenges. Based on this, combining PLS and TS fuzzy model, a modeling method of dynamic nonlinear multi-input multi-output (MIMO) system is proposed in this paper, which effectively solves the problem of strong nonlinear and correlation, at the same time reduces the computational complexity of data modeling methods. The simulation results show that this modeling could effectively describe the relationship between storage grain and environment.

Anti-fouling nanofiltration membranes based on macromolecule crosslinked polyvinyl alcohol

Dujuan Hu,Yanbo Li,Zhiguo Yan,Shaoping Li,Man Xu,Cunwen Wanga 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.112 No.-

Nanofiltration membranes with excellent anti-fouling properties were fabricated through a green surfacecrosslink method. Poly (styrene-maleic anhydride) (SMA) blended polyethersulfone (PES) membrane wasused as a support. The SMA in the PES support served as a macromolecular crosslinker. After coating ofpolyvinyl alcohol (PVA) on the surface of the SMA-PES support, a PVA selective layer with gradient crosslinkedstructure was formed, through the esterification between the anhydride groups in SMA and thehydroxyl groups in PVA. This process adopts a full-water fabrication strategy without secondary pollution. The gradiently cross-linked PVA/SMA-PES membrane, with molecular weight cut-off (MWCO) about600 Da and permeance around 10-12 L/(m2hbar), exhibited good dye/salts separation performance. Inthe filtration of a mixed solution of Congo Red (CR) and calcium chloride (CaCl2), the membrane rejected98% CR and only had 10% rejection of CaCl2. In addition, this membrane processed an excellent antifoulingproperty. In the BSA fouling test, the pure water flux recovery ratio (FRR) was 99%. It is expectedthat the PVA/SMA-PES membrane can be used in organic desalination.

Junction Temperature Estimation Approach Based on TSEPs in Multichip IGBT Modules

Jianxiong Yang,Yanbo Che,Li Ran,Borong Hu,Mingxing Du 전력전자학회 2022 JOURNAL OF POWER ELECTRONICS Vol.22 No.9

Power semiconductor chips are parallelly packed in modules to achieve a specific current capacity and power level. An inhomogeneous degradation of the solder layer makes the junction temperature between chips unevenly distributed in multichip modules. The real matters of the junction temperature represented by the terminal electrical characteristics are not known when a junction temperature difference occurs in the internal chip of a multichip IGBT module. This paper analyzes the electrothermal coupling characteristics among the chips in multichip modules and establishes a mathematical model of the electrothermal relationship. To accurately control the different temperature distributions and uneven aging conditions of paralleled chips, two power modules or two discrete devices packaged in a TO-247 are connected in parallel to simulate a multichip power module. The correctness of the proposed electrothermal model and the feasibility of simulating multichip modules are verified through experiments. The findings indicate that the temperature evaluated by the threshold voltage approaches the maximum temperature of the chips inside the module. The junction temperature evaluated by the maximum change rate of the collector–emitter voltage and that of the collector current approach are used to obtain the average temperature.