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The Disturbance Rejection Design Based on Physical Feedforward for Solid Oxide Fuel Cell
Zhenlong Wu,Wangying Shi,Donghai Li,Ting He,Yali Xue,Minfang Han,Song Zheng 제어로봇시스템학회 2017 제어로봇시스템학회 국제학술대회 논문집 Vol.2017 No.10
The output voltage control of the Solid Oxide Fuel Cell (SOFC) is challenging due to the strong nonlinearity, modelling uncertainty, the dramatic change of the external current load and constraints on the amplitudes and change rates of the actuator. Besides, the desired range of the fuel utilization is another difficult for the control strategy. In this paper, Active disturbance rejection control (ADRC) is proposed to handle the nonlinearity, uncertainty and the external disturbance, and physical feedforward is designed to speed up the response of the whole system and keep the fuel utilization in the desired range. Instead of the SOFC model, the design of physical feedforward is based on the definition of fuel utilization which is featured by simplicity, generality and effectiveness. Simulation results show that the proposed control strategy has smaller variation range of the fuel utilization, shorter time of the changing process of the output voltage and better robustness than others control strategies.
Zhenlong Wu,Fan Zhang,Gengjin Shi,Ting He,Donghai Li,YangQuan Chen 제어로봇시스템학회 2019 제어로봇시스템학회 국제학술대회 논문집 Vol.2019 No.10
Superheated steam temperature (SST) systems face many control difficulties caused by unknown disturbances and high order dynamics. This is becoming more and more severe due to the rapid growing of intermittent renewable generation. To improve the tracking and disturbance rejection performance of SST systems, a modified active disturbance rejection control (ADRC) is proposed. Based on its equivalent structure, this paper develops the frequency-domain analysis of the modified ADRC to present the influence of parameters on the control performance. Then the modified ADRC based on the frequency-domain analysis is applied to the SST control to verify the superiority of the modified ADRC. Based on the results of the simulation and the field application on a power plant simulator, the modified ADRC can obtain the best tracking performance with a small overshoot and short settling time compared with other comparative controllers. Besides, the modified ADRC has the smallest fluctuation range of SST under the input disturbance and load varying conditions. The superiority of the modified ADRC ensures the satisfactory control performance and shows a great potential in industrial applications.
Active Disturbance Rejection Control for Fluidized Bed Combustor
Zhenlong Wu,Donghai Li,Yali Xue,Lingmei Wang,Jing Wang 제어로봇시스템학회 2016 제어로봇시스템학회 국제학술대회 논문집 Vol.2016 No.10
Active disturbance rejection control (ADRC) is applied in fluidized bed combustor (FBC) facing some control difficulty. By analyzing the difficulties, ADRC controllers are designed for the power loop and the bed temperature loop of FBC system. The simulation demonstrates both loops with ADRC have a better tracking speed and a stronger robustness, the power loop can inhibit the input and output disturbance quickly and the temperature loop has a slight advantage in disturbance rejection. Besides, manipulated variables is analyzed by the phase diagrams.
Clonging and Expression of Heparinase III Gene from Flavobacterium heparinum
( Ye Li ),( Donghai Su ),( Lihua Jin ),( Jingjun Wu ),( Xinhui Xing ) 조선대학교 공학기술연구원 2012 공학기술논문지 Vol.5 No.4
To enhance solubility of heparinase III when expressed in recombinant E. coli, the heparinase III gene (HepC) of 1980 bp from Flavobacterium heparinum was amplified by the PCR method, and then it was in inserted in the prokaryotic expression vector pMAL-c2x with the gene of maltose binding protein (MBP) which was identified by colony PCR, restriction enzyme digestion and gene sequencing. The results showed that the fusion strategy by using maltose binding protein (MBP) was effective to enhance solubility when induced at low temperatures, such as 15°C. By shake flask cultivation, the specific enzyme activity of MBP-hepC fusion protein could reach about 46.41 IU/mg which was higher than previous reported results. By one-step affinity purification with amylose resin, the MBP-hepC fusion protein was easily purified to more than 95% purifty and the enzyme characteristics were studied. The optimum reaction pH value of MEP-hepC was 7.3. The optimum reaction temperature was 42-48°C, which was different from the native heparinase III from Flavobacterium heparinum. This enzymatic reaction to heparine followed Michaelis-Menten equation. The all above realize the process intergration of the enzyme production, separation, purification and applications in LMWH production for reducing the enzyme cost. The study laid the foundation for industrial production of low molecular weight heparin.
Gengjin Shi,Ting He,Zhenlong Wu,Donghai Li 제어로봇시스템학회 2019 제어로봇시스템학회 국제학술대회 논문집 Vol.2019 No.10
The boiler superheated steam temperature (SST) is a typical thermal process with great inertia and large delay. Its dynamic characteristics tend to change significantly with the variation of the operating point so that constant-parameter control system are not able to provide satisfactory dynamic control performance. Cascade active disturbance rejection control systems are commonly used in the control of the process with high order, especially in the control of superheated steam temperature. However, with the variations of loads, the tuning of linear ADRC (LADRC) becomes more complex. In order to simplify the tuning of bandwidth-parameters of LADRC in different loads, this paper studies control effects of cascade ADRC system of SST applied gain scheduling. Simulation results demonstrate that scheduling the bandwidth of feedback control system best improves dynamic characteristics of SST control system. Compared with the optimization of bandwidth-parameters using fruit fly algorithm, gain scheduling has better control performance in the control of SST.
Study on Power Control Methodology of the Accelerator Driven Sub-critical Reactor System
YuXin Yang,Zhiwei Zhou,Ting He,Zhenlong Wu,Donghai Li 제어로봇시스템학회 2017 제어로봇시스템학회 국제학술대회 논문집 Vol.2017 No.10
The Accelerator Driven sub-critical reactor System (ADS) is an innovative system for the utilization of nuclear energy, for which the strategy of power control is different from the current critical reactor. In this paper, the physical model of the sub-critical reactor core of ADS was built according to the point space-time neutron kinetics equations with delayed neutrons produced by precursor nuclides of one equivalent group. The linear approximation of equations was done near the steady working point, based on which, the kinetic neutronics and thermal characteristics of ADS were analyzed, and the strategy of power control system of the sub-critical reactor core of ADS was studied. A constant power control system was designed by means of the Proportion-Integral Derivative (PID) controller and the Linear Active Disturbance Rejection Controller (LADRC). The controllers were tuned in the linearized model and then tested in the actual nonlinear model by means of Matlab/Simulink. The results show, that for both methods, the control system can avoid the disturbances induced by the external neutron source intensity or the reactivity, and make the power constant with little over shoot and short settling time, and the control effect of LADRC is better than PID.
Active Disturbance Rejection Control for Boiler Superheated Steam Temperature
Makeximu,Min Zhu,Yong Sun,Zhenlong Wu,Donghai Li,Yali Xue 제어로봇시스템학회 2016 제어로봇시스템학회 국제학술대회 논문집 Vol.2016 No.10
In this paper, an active disturbance rejection control (ADRC) with tracking differentiator (TD) solution is proposed and tested on a certain four operating condition model. The proposed system with a cascaded control scheme is constructed based on a linear Active disturbance rejection controller (LADRC) with parameters optimized under a modified fruit fly algorithm. The tracking performance could be improved by the tracking differentiator with flexible damping. The simulation results indicate that the proposed strategy could effectively balance rapid and stable responses.
Hongbo Li,Xiaoyan Hui,Peng Li,Aimin Xu,Shiwu Li,Shouguang Jin,Donghai Wu 한국생물공학회 2015 Biotechnology and Bioprocess Engineering Vol.20 No.2
Insulin-like growth factor-II (IGF2) is a growth factor for the control of cell proliferation and apoptosis. To explore the clinical use of human IGF2, an efficient method for production of a large amount of active recombinant hIGF2 is necessary. Human IGF2 cDNA was cloned into pET32 vector where it is under the control of an IPTGinducible T7 promoter. High level soluble thioredoxin (Trx)- hIGF2 fusion protein was produced at room temperature following IPTG induction, amounting up to 20% of the total soluble bacterial proteins. The recombinant TrxhIGF2 fusion protein was purified to an approximate 95% purity using Ni+-NTA affinity chromatography with an overall yield of 120 mg protein per liter of bacterial culture. After cleavage of the Trx fusion fragment by recombinant enterokinase, the tag-free recombinant hIGF2 protein (rhIGF2) was purified by passage through the Ni+-NTA affinity column again. Biological activity of the purified hIGF2 was determined by its ability to support NIH/3T3 cells proliferation and to activate AKT signaling pathways. Our results demonstrate that tag-free active rhIGF2 can easily be obtained for various applications from E. coli using the procedure described in this report.