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Deep-learning-assisted online surface roughness monitoring in ultraprecision fly cutting

Science China(Technological Sciences) 2024年第5期67卷 1482-1497页

作者： SHEHZAD Adeel RUI XiaoTing DING YuanYuan ZHANG JianShu CHANG Yu LU HanJing CHEN YiHeng Institute of Launch Dynamics Nanjing University of Science and TechnologyNanjing210094China National Key Laboratory of Complex Multibody System Dynamics Nanjing210094China Automotive Engineering Centre University of Engineering and TechnologyLahore54890Pakistan School of Science Nanjing University of Science and TechnologyNanjing210094China College of Engineering Peking UniversityBeijing100871China

Surface roughness is one of the most critical attributes of machined components,especially those used in high-performance systems.Online surface roughness monitoring offers advancements comparable to post-process inspection methods,reducing inspection time and costs and concurrently reducing the likelihood of defects.Currently,online monitoring approaches for surface roughness are constrained by several limitations,including the reliance on handcrafted feature extraction,which necessitates the involvement of human experts and entails time-consuming processes.Moreover,the prediction models trained under one set of cutting conditions exhibit poor performance when applied to different experimental settings.To address these challenges,this work presents a novel deep-learning-assisted online surface roughness monitoring method for ultraprecision fly cutting of copper workpieces under different cutting conditions.Tooltip acceleration signals were acquired during each cutting experiment to develop two datasets,and no handcrafted features were extracted.Five deep learning models were developed and evaluated using standard performance metrics.A convolutional neural network stacked on a long short-term memory network outperformed all other network models,yielding exceptional results,including a mean absolute percentage error as low as 1.51%and an R2value of 96.6%.Furthermore,the robustness of the proposed model was assessed via a validation cohort analysis using experimental data obtained using cutting parameters different from those previously employed.The performance of the model remained consistent and commendable under varied conditions,asserting its applicability in real-world scenarios.

关键词： online surface roughness monitoring upfc deep learning CNN-LSTM vibration signal

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计及upfc最优配置的电力系统鲁棒调度协同优化策略

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电力自动化设备 2024年第2期44卷 165-172页

作者：商立群惠泽王建新西安科技大学电气与控制工程学院西安市电气设备状态监测与供电安全重点实验室陕西西安710054

统一潮流控制器(upfc)应用于潮流调控时,计及upfc调控参数的交流潮流计算是非凸、非线性问题,且多台装置间的非线性交叉耦合特性也会直接影响优化配置方案。为此,基于upfc的潮流调控特性,构建了计及upfc的松弛型交流潮流二阶锥规划模型... 详细信息

统一潮流控制器(upfc)应用于潮流调控时,计及upfc调控参数的交流潮流计算是非凸、非线性问题,且多台装置间的非线性交叉耦合特性也会直接影响优化配置方案。为此,基于upfc的潮流调控特性,构建了计及upfc的松弛型交流潮流二阶锥规划模型;计及风电的不确定性,协同考虑upfc的规划和电力系统的调度问题,建立了计及upfc最优配置的电力系统鲁棒协同优化模型,并采用列和约束生成算法进行求解。以IEEE RTS-24节点系统为算例进行仿真分析,结果表明所提协同优化策略有效提升了upfc配置方案的适应性,提高了系统运行经济性和风电消纳能力,增强了系统运行调控的灵活性。

关键词： upfc 风电不确定性凸优化交叉耦合特性鲁棒调度协同优化电力系统

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基于双碳目标的新型电力upfc系统

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电气应用 2024年第1期43卷 1-7,I0004页

作者：赵长枢徐圆圆畅伟马青林弘范浩然方洁国网嘉兴供电公司浙江嘉兴314001

基于双碳目标,构建一种可再生能源经由储能电池接入的新型统一潮流控制器(Unified Power Flow Controller,upfc)系统。对新型upfc系统进行数学建模,提出两种合理的输电调度方案:第一种方案以输送有功功率的最小成本为目标函数进行优化调... 详细信息

基于双碳目标,构建一种可再生能源经由储能电池接入的新型统一潮流控制器(Unified Power Flow Controller,upfc)系统。对新型upfc系统进行数学建模,提出两种合理的输电调度方案:第一种方案以输送有功功率的最小成本为目标函数进行优化调度;第二种方案考虑输电线路的稳定裕度和输送有功功率的成本,通过线性权重的归一化法统一量纲后进行多目标的优化调度。最后算例仿真计算两种方案的优化调度结果,并分析各自特点。

关键词： upfc 换流器可再生能源优化调度线性权重

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Harmonics Mitigation Using MMC Based upfc and Particle Swarm Optimization

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Intelligent Automation & Soft Computing 2023年第3期35卷 3429-3445页

作者： C.Gnana Thilaka M.Mary Linda Ponjesly College of Engineering Nagercoil629003India

The application of non-linear loads in the power electronic device causes serious harmonic issues in the power system since it has the intrinsic prop-erty of retrieving harmonic current and reactive power from Alternating Current(AC)supply that leads to voltage instability.To maintain a reliable powerﬂow in the power system,an innovative Uniﬁed Power Flow Converter(upfc)is uti-lized in this proposed approach.The conventional series converter is replaced with the Modular Multilevel Converter(MMC)that improves the power handling capability and achieves higher modular level with minimized distortions.The shunt compensator assists in minimizing the voltageﬂuctuations and maximizing the voltage stability under different load constraints.The Direct Quadrature(DQ)theory is utilized in this study to separate the harmonic components by generating reference frame current.The Proportional Integral(PI)controller aids in maintain-ing the direct current potential difference in the constant mode whereas the Pulse Width Modulation(PWM)generator helps in delivering optimized output to the MMC.The gain parameters of PI controller are optimized with the aid of employ-ing Particle Swarm Optimization(PSO).The entire work is validated using MATLAB simulink and the obtained outcomes proves that this new upfc is highly beneﬁcial in minimizing the distortions with reduced Total Harmonic Distortion(THD)of 2.21%.

关键词： upfc PI controller PSO MMC DQ theory STATCOM

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upfc Based Real-Time Optimization of Power Systems for Dynamic Voltage Regulation

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Computer Modeling in Engineering & Sciences 2018年第9期116卷 391-406页

作者： Serhat Berat Efe Bitlis Eren University Department of Electrical and Electronics EngineeringBitlis13000Turkey

Flexible alternating current transmission system(FACTS)components are used to utilize the electrical transmission lines at their optimum capacity.The best way to achieve this optimization is to manage the active and reactive power flows.A unified power flow controller(upfc)is one of the most significant devices developed for the effective control of power flows.Although conventional upfc structures can be used to achieve this process,the expansion of power systems has led to the necessity of developing various upfc devices.This paper focuses on an advanced real time control approach of upfc for dynamic voltage regulation.The developed model is incorporated in the Gauss-Seidel(GS)power flow algorithm and the proposed method is validated on the IEEE-30 bus system that is designed under MATLAB/Simulink platform.As the proposed method was validated by comparing with the normal operating conditions,advantages were observed on two cases.In the first case,a generator outage is applied to system to observe behavior of proposed model in power loss conditions.In the second case,line fault conditions were used for observation.The results from testing the model for both cases prove that the approach has positive effects on dynamic power systems.

关键词： Power flow control upfc FACTS devices power system analysis computing Gauss-Seidel algorithm

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A critical fault detection analysis & fault time in a upfc transmission line

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Protection and Control of Modern Power Systems 2019年第1期4卷 24-33页

作者： S.K.Mishra L.N.Tripathy School of EE Research ScholarKIIT UniversityBhubaneswar751024India Department of EE C.E.TBhubaneswarOdishaIndia

This paper discusses a critical study of fault detection and fault time analysis in a Unified Power Flow Controller (upfc) transmission line. Here the Discrete Wavelet Transform (DWT) and Discrete Fourier Transform (DFT) approach are used for processing the faulty current signal to obtain fundamental current signal. The extracted fault current signals from the current transformer are fed to DWT and DFT approach for computing spectral energy (SE). The differential spectral energy (DSE) of phase currents are evaluated by taking the difference of SE obtained at sending and receiving end. The DSE is the key factor for deciding the fault in any of the phase or not. The Daubechy mother wavelet (db4) is used here because of its high accuracy of detection with less processing time. The novelty of the scheme is that it can accurately detect the critical fault variation of the line. Number of simulations are validated at the extreme condition of the line and compared to other conventional existing scheme. Multi-phase fault in double circuit line, CT saturation, upfc operating condition (series voltage and angle), upfc location and wind speed variation including wind farm simulation are validated to verify the performance of the scheme. The advantages of the scheme is that it works effectively to detect the fault at any stage of critical condition of the line and fault detection time remains within 20 msec (less than one cycle period). This scheme protects both internal and external zone including parameter variation of the line.

关键词： DSE Fault detection upfc Threshold Fault time

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LQR and LQG based optimal switching techniques for PSS and upfc in power systems

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Control Theory and Technology 2018年第1期16卷 25-37页

作者： L. YATHISHA S. PATILKULKARNI E & C Department ATME College of Engineering VTU Karnataka India E & C Department Sri Jayachamarajendra College of Engineering (JSSSTU) Karnataka India

Selection of better optimized unified power flow controller （upfc） control inputs along with simultaneous coordinated design of power system stabilizer （PSS） is a challenge in the present scenario of power systems. Hence, in this paper, four sets of experiments performed are presented. First set of experiments are without disturbance scenario where switching is done using linear quadratic regulators （LQR＇s）. Second set is for power systems with disturbances using linear quadratic gaussian （LQG）. Switching control algorithms presented here are tested on the single machine infinite bus （SMIB） linearised Phillips Heffron model of power system using MATLAB/SIMULINK~ platform.

关键词： LQR LQG upfc PSS power system ＆ SMIB

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Congestion mitigation on high voltage power lines using multiple TCSC & upfc

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International Journal of Modeling, Simulation, and Scientific Computing 2015年第2期6卷 198-212页

作者： Anwar S.Siddiqui Tanmoy Deb Faculty of Engineering and Technology Department of Electrical Engineering Jamia Millia Islamia New Delhi-110025India

With severe overload on transmission lines,further exchange of power flow is affected due to congestion on power transmission lines.This paper investigates the effect of Flexible AC Transmission System(FACTS)devices like TCSC and upfc in congestion mitigation.The proposal uses multiple FACTS devices of similar type and investigates their effect on congestion mitigation in high voltage transmission lines.This proposal is tested on IEEE-14 bus system.

关键词： Congestion multiple FACTS devices of similar type TCSC upfc

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基于统一潮流控制器和拓扑调整的海上风电功率控制策略

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现代电力 2023年第3期40卷 285-294页

作者：闫金涛黄玲玲刘阳应飞祥王启国秦少茜上海电力大学电气工程学院上海市杨浦区200090

针对大规模海上风电并网对陆上电网运行带来的影响,结合海上风电与输电系统互联,逐步形成“海上电网”的新趋势,提出一种基于统一潮流控制器(unified power flow controller,upfc)和拓扑调整的海上风电功率控制策略,对具有互联效应的海... 详细信息

针对大规模海上风电并网对陆上电网运行带来的影响,结合海上风电与输电系统互联,逐步形成“海上电网”的新趋势,提出一种基于统一潮流控制器(unified power flow controller,upfc)和拓扑调整的海上风电功率控制策略,对具有互联效应的海上电网中的潮流分布进行控制,构建陆上电网最优潮流和含upfc和拓扑调整的海上风电功率控制两层联合优化运行模型。算例结果表明,提出的upfc和拓扑调整的联合控制策略可以较好地控制海上风电功率在各个并网点之间的功率分配,实现陆上电网对海上风电功率在各个并网点功率分配的需求,有利于海上风电友好地接入陆上电网。

关键词：海上风电海上电网 upfc 拓扑调整功率控制

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Integrated Multi-stage LQR Power Oscillation Damping FACTS Controller

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CSEE Journal of Power and Energy Systems 2018年第1期4卷 83-92页

作者： Rajendra K.Pandey Deepak Kumar Gupta Department of Electrical Engineering Indian Institute of Technology(Banaras Hindu University)Varanasi-221005India

This paper presents an approach for oscillation damping with an integrated multi-stage linear quadratic regulator(MSLQR)FACTS controller combining power oscillation damping(POD)capabilities.The particle swarm optimization(PSO)technique has been used for precise tuning initial control parameters of power system stabilizers(PSS)and FACTS devices(such as STATCOM and upfc)which results in improved controller performance.It is observed that the proposed control structure damps the oscillations adequately and is modular in design methodology.The sample power system comprising six areas is considered to demonstrate the effectiveness of the proposed concept.The states inter-relation which is shown with eigenvalues reflects better regulation with the proposed controller.The step response also validates the controller performance.

关键词： Integral time multiplied by absolute error(ITAE) multi-stage linear quadratic regulator(MSLQR) particle swarm optimization(PSO) power oscillation damping controller STATCOM upfc

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