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Day-ahead Risk-constrained Stochastic Scheduling of Multi-energy System

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Journal of Modern Power Systems and Clean Energy 2021年第4期9卷 720-733页

作者： Yue Yin tianqi liu Lei Wu Chuan He Yikui liu Department of Electrical Engineering Sichuan UniversityChengdu 610065China Department of Electrical and Computer Engineering Stevens Institute of TechnologyHobokenNJ 07030USA

As an increasing penetration of renewable energy sources can potentially impact voltage profile and compromise system security,the security continues to be the most critical concern in power system operations.A risk-constrained stochastic scheduling model is proposed to leverage the latent scheduling capacity of a multi-energy system to seek an economic operation solution while maintaining system operation risk level against uncertain renewable *** risk constraints,as compared to the straightforward voltage boundary limits,are incorporated into the stochastic scheduling model to guarantee the operation security and *** AC power flow model is applied to enable overvoltage risk assessment within the coordinated scheduling *** proposed stochastic scheduling model is tackled via the improved progressive hedging approach with an enhanced relax-round-polish process,which overcomes the convergence issues of the traditional progressive hedging in handling nonconvex stochastic scheduling model with binary variables on both *** simulation results of IEEE 30-bus system and IEEE 118-bus system illustrate the efficacy of the proposed model in ensuring voltage security and improving economic operation of systems.

关键词： AC power flow overvoltage risk constraint renewable energy multi-energy coordination

Graph Theory Based N-1 Transmission Contingency Selection and Its Application in Security-constrained Unit Commitment

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Journal of Modern Power Systems and Clean Energy 2021年第6期9卷 1458-1467页

作者： Lu Nan Yikui liu Lei Wu tianqi liu Chuan He College of Electrical Engineering Sichuan University the Department of Electrical and Computer Engineering Stevens Institute of Technology Department of Electrical and Computer Engineering Stevens Institute of Technology

Contingency analysis is an important building block in the stability and reliability analysis of power grid operations. However, due to the large number of transmission lines,in practice only a limited number of contingencies could be evaluated. This paper proposes a graph theory based N-1 contingency selection method to effectively identify the most critical contingencies, which can be used in security-constrained unit commitment(SCUC) problems to derive secure and economic operation decisions of the power grid. Specifically, the power flow transferring path identification algorithm and the vulnerability index are put forward to rank individual contingencies according to potential transmission line overloads. Effectiveness of the proposed N-1 contingency selection method is quantified by applying the corresponding SCUC solution to the full N-1 security evaluation, i. e., quantifying total post-contingency generation-load imbalance in all N-1 contingencies. Numerical results on several benchmark IEEE systems, including5-bus, 24-bus, and 118-bus systems, show effectiveness of the proposed method. Compared with existing contingency selection methods which usually resort to full power flow calculations,the proposed method relies on power gird topology to effectively identify critical contingencies for facilitating the optimal scheduling of SCUC problems.

关键词： Concentric relaxation contingency analysis graph theory security-constrained unit commitment(SCUC) shortest path vulnerability index

Simulation of the characteristics of low-energy proton induced single event upset

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Science China(Physics,Mechanics & Astronomy) 2014年第10期57卷 1902-1906页

作者： GENG Chao XI Kai liu tianqi liu Jie Institute of Modern Physics Chinese Academy of Sciences University of Chinese Academy of Sciences

Monte Carlo simulation results are reported on the single event upset(SEU) triggered by the direct ionization effect of low-energy proton. The SEU cross-sections on the 45 nm static random access memory(SRAM) were compared with previous research work, which not only validated the simulation approach used herein, but also exposed the existence of saturated cross-section and the multiple bit upsets(MBUs) when the incident energy was less than 1 MeV. Additionally, it was observed that the saturated cross-section and MBUs are involved with energy loss and critical charge. The amount of deposited charge and the distribution with respect to the critical charge as the supplemental evidence are discussed.

关键词： single event upset proton direct ionization Monte Carlo

Reclosing Current Limiting for DC Line Faults in VSC-HVDC Systems

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Journal of Modern Power Systems and Clean Energy 2022年第4期10卷 1040-1049页

作者： Shunliang Wang Junjie Zhou Ji Shu tianqi liu Junpeng Ma College of Electrical Engineering Sichuan UniversityChengdu 610065China

The problem of reclosing current limiting in voltage source converter based high-voltage direct current(VSCHVDC)systems is becoming more and more serious.A soft reclosing scheme for DC permanent faults is presented in this *** the converter voltages of stations at both terminals of the disconnected faulty line may be different,the choice of which terminal to reclose first will affect the reclosing overcurrent.A method for selecting the terminal to reclose first is investigated to achieve a minimum peak overcurrent during the reclosing *** order to ensure that the hybrid DC circuit breaker(HDCCB)adapts to the needs of the reclosing process better,the traditional HDCCB is improved by adding a soft reclosing module(SRM).The energy dissipated in the arresters is significantly reduced when using the improved *** improved HDCCB will be able to reclose multiple times safely and thus increase the possibility of successful ***,the recovery time after the HDCCB is successfully reclosed is very short with the improved HDCCB and its control *** results show that this proposed scheme is capable of limiting the reclosing overcurrent when the fault still exists.

关键词： Soft reclosing current limiting voltage source converter based high-voltage direct current(VSC-HVDC) DC fault

Silk Fibroin and κ-Carrageenan Composite Films Containing Zinc-doped Bioactive Glass for Wound Closure

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Journal of Bionic Engineering 2021年第6期18卷 1400-1412页

作者： Ruofan Wang Liming Ruan Pengfei Li tianqi liu Guohua Jiang School of Materials Science and Engineering Zhejiang SciTech UniversityHangzhou310018China Department of Dermatology Beilun District People’s Hospital of Ningbo CityNingbo315800China Zhejiang-Mauritius Joint Research Center for Biomaterials and Tissue Engineering Zhejiang Sci-Tech UniversityHangzhou310018China Institute of Smart Biomedical Materials Zhejiang Sci-Tech UniversityHangzhou310018China

Natural biopolymers have excellent biocompatibility and biodegradability;they can be used as biomedical materials for wound *** this work,the Silk Fibroin(SF)andκ-carrageenan(κ-Car)composite films containing Zinc-doped Bioactive Glass(ZBG)have been fabricated for wound closure *** as-fabricated SF-κ-Car/ZBG composite films have excellent stretchability and foldability,which facilitates them for application as wound *** also exhibit excellent hydrophilicity and water-absorption capacity,which can effectively absorb wound exudate and keep the wound sites under moist *** addition,the composite films have a good antibacterial effect against *** and *** in vitro,which can reduce the risk of wound *** excellent cell compatibility is confirmed by the CCK-8 *** strong vascular proliferation and wound regeneration are found in SF-κ-Car/ZBG composite films on a mouse skin wound *** SF-κCar/ZBG composite films can inhibit the secretion of inflammatory factors,and stimulate the production of vascular factors and collagen *** results derived from the performed investigations revealed that the SF-κ-Car/ZBG composite films are a promising candidate dressing for wound healing applications.

关键词： Wound dressings Silk fibroin κ-Carrageenan Zinc-doped bioactive glass Wound healing

Robust coordination of interdependent electricity and natural gas systems in day-ahead scheduling for facilitating volatile renewable generations via power-to-gas technology

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Journal of Modern Power Systems and Clean Energy 2017年第3期5卷 375-388页

作者： Chuan HE tianqi liu Lei WU Mohammad SHAHIDEHPOUR School of Electrical Engineering and Information Sichuan UniversityChengdu 610065China Electrical and Computer Engineering Department Clarkson UniversityPotsdamNY 13699USA Electrical and Computer Engineering Department Illinois Institute of TechnologyChicagoIL 60616USA

The increasing interdependency of electricity and natural gas systems promotes coordination of the two systems for ensuring operational security and *** paper proposes a robust day-ahead scheduling model for the optimal coordinated operation of integrated energy systems while considering key uncertainties of the power system and natural gas system operation cost. Energy hub,with collocated gas-fired units, power-to-gas(Pt G) facilities, and natural gas storages, is considered to store or convert one type of energy(i.e., electricity or natural gas)into the other form, which could analogously function as large-scale electrical energy storages. The column-andconstraint generation(C&CG) is adopted to solve the proposed integrated robust model, in which nonlinear natural gas network constraints are reformulated via a set of linear constraints. Numerical experiments signify the effectiveness of the proposed model for handling volatile electrical loads and renewable generations via the coordinated scheduling of electricity and natural gas systems.

关键词： Robust day-ahead scheduling Electricity and natural gas coordination Renewable energy Power-to-gas Column-and-constraint generation

Operation-area-constrained Adaptive Primary Frequency Support Strategy for Electric Vehicle Clusters

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Journal of Modern Power Systems and Clean Energy 2023年第6期11卷 1982-1994页

作者： tianqi liu Pengyu Wang Qiao Peng Min Zhang Tengxin Wang Jinhao Meng College of Electrical Engineering Sichuan UniversityChengdu 610065China Electric Power Research Institute State Grid Shanxi Electric Power CompanyTaiyuan 030001China

Due to their fast response and strong short-term power throughput capacity, electric vehicles(EVs) are promising for providing primary frequency support to power grids. However, due to the complicated charging demands of drivers, it is challenging to efficiently utilize the regulation capacity of EV clusters for providing stable primary frequency support to the power grid. Accordingly, this paper proposes an adaptive primary frequency support strategy for EV clusters constrained by the charging-behavior-defined operation area. First, the forced charging boundary of the EV is determined according to the driver's charging behavior, and based on this, the operation area is defined. This ensures full utilization of the available frequency support capacity of the EV. An adaptive primary frequency support strategy of EV clusters is then proposed. The output power of EV is adaptively regulated according to the real-time distance from the EV operating point to the forced charging boundary. With the proposed strategy, when the EV approaches the forced charging boundary, its output power is gradually reduced to zero. Then, the rapid state-of-charge declines of EVs and sudden output power reductions in EV clusters caused by forced charging to meet the driver's charging demands can be effectively avoided. EV clusters can then provide sustainable frequency support to the power grid without violating the driver's charging demands. Simulation results validate the proposed operation-area-constrained adaptive primary frequency support strategy, which outperforms the average strategy in terms of stable output maintenance and the optimal utilization of regulation capacities of EV clusters.

关键词： Primary frequency control frequency support electric vehicle vehicle-to-grid(V2G) operation area charging behavior

Online Identification of Lithium-ion Battery Model Parameters with Initial Value Uncertainty and Measurement Noise

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Chinese Journal of Mechanical Engineering 2023年第1期36卷 305-314页

作者： Xinghao Du Jinhao Meng Kailong liu Yingmin Zhang Shunli Wang Jichang Peng tianqi liu College of Electrical Engineering Sichuan UniversityChengdu610044China School of Electrical Engineering Xi’an Jiaotong University710049Xi’anChina Warwick Manufacturing Group University of WarwickCoventryUK Southwest University of Science and Technology Mianyang621010China Nanjing Institute of Technology Nanjing211103China

Online parameter identification is essential for the accuracy of the battery equivalent circuit model(ECM).The traditional recursive least squares(RLS)method is easily biased with the noise disturbances from sensors,which degrades the modeling accuracy in ***,the recursive total least squares(RTLS)method can deal with the noise interferences,but the parameter slowly converges to the reference with initial value *** alleviate the above issues,this paper proposes a co-estimation framework utilizing the advantages of RLS and RTLS for a higher parameter identification performance of the battery *** converges quickly by updating the parameters along the gradient of the cost *** is applied to attenuate the noise effect once the parameters have *** simulation and experimental results prove that the proposed method has good accuracy,a fast convergence rate,and also robustness against noise corruption.

关键词： Li-ion battery Equivalent circuit model Recursive least squares Recursive total least squares

Fromα-keto acids to nitrile oxides enabled by copper nitrate:a facile access to fused isoxazolines

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Organic Chemistry Frontiers 2022年第3期9卷 676-681页

作者： Yuping Zhu tianqi liu Bingxin liu Houguang Shi Qitao Tan Bin Xu Department of Chemistry Affiliated Nantong Hospital of Shanghai University(The Sixth People’s Hospital of Nantong)Shanghai Engineering Research Center of Organ RepairInnovative Drug Research CenterSchool of MedicineShanghai UniversityShanghai 200444China State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic ChemistryChinese Academy of SciencesShanghai 200032China

α-Keto acids were unprecedentedly employed as novel precursors of nitrile oxides on treatment with copper nitrate,which reacted with maleimides via[3+2]dipolar cycloaddition leading to pharmacologically interesting fused *** approach offers a unique strategy and complementary method for the convenient generation of alkyl substituted nitrile oxides.

关键词： nitrate fused oxides