检索结果-内蒙古大学图书馆

Design, Test, Integration and Packaging of MEMS/MOEMS

作者： Liane Koker Klaus-Martin Reichert Ulrich Gengenbach Markus Reischl Martin Ungerer Institute for Automation and Applied Informatics Karlsruhe Institute of Technology Karlsruhe Germany

ISBN: (数字)9798350378269

ISBN: (纸本)9798350378276

We present a real-time-controlled platform applied for automated characterisation of structures, devices and circuits printed on planar substrates. Its modular setup allows for implementation of different probe heads and a large number of instruments for electrical testing. Microscope optics are used to capture high-resolution images of entire printed substrates. Based on these images printed structures on the substrates are optically inspected for printing errors by means of image processing and electrically tested. Applications include fast identification of optimal printing parameters for various ink-substrate combinations, characterisation of complex printed devices and circuits and identification of known-good structures for multi-stage printing.

关键词： Printing Optical microscopy Microscopy Circuits Packaging Optical imaging Object recognition

来源：评论

学校读者我要写书评

暂无评论

The Price of Uncertainty: Chance-constrained OPF vs. In-hindsight OPF

The Price of Uncertainty: Chance-constrained OPF vs. In-hind...

引用

Power Systems Computation Conference

作者： Tillmann Muhlpfordt Veit Hagenmeyer Timm Faulwasser Institute for Automation and Applied Informatics Karlsruhe Institute of Technology Karlsruhe Germany

The operation of power systems has become more challenging due to feed-in of volatile renewable energy sources. Chance-constrained optimal power flow (ccOPF) is one possibility to explicitly consider volatility via probabilistic uncertainties resulting in mean-optimal feedback policies. These policies are computed before knowledge of the realization of the uncertainty is available. On the other hand, the hypothetical case of computing the power injections knowing every realization beforehand - called in-hindsight OPF (hOPF) - cannot be outperformed w.r.t. costs and constraint satisfaction. In this paper, we investigate how CCOPF feedback relates to the full-information HOPF. To this end, we introduce different dimensions of the price of uncertainty. Using mild assumptions on the uncertainty we present sufficient conditions when ccOPF is identical to hOPF. We suggest using the total variational distance of probability densities to quantify the performance gap of hOPF and CCOPF. Finally, we draw upon a tutorial example to illustrate our results.

关键词： Chance constraints Optimal power flow Optimization Uncertainty

来源：评论

学校读者我要写书评

暂无评论

A Multi-Operator Retargeting Scheme for Compressed Videos

A Multi-Operator Retargeting Scheme for Compressed Videos

引用

IEEE International Conference on Consumer Electronics-Taiwan (ICCE-TW)

作者： Dai-Yan Wei Yung-Chieh Chou Po-Chyi Su Institute for Automation and Applied Informatics Karlsruhe Institute of Technology Karlsruhe Germany

This research presents a multi-operator retargeting scheme, in which content-based cropping, seam carving/insertion and scaling are applied sequentially to adjust the video frames to the target resolution. Assuming that the video to be processed is encoded with H.264/AVC, compressed-domain data in the bitstream are utilized to classify video shots into different types for further processing. SLIC superpixels are formed to identify boundaries of objects and a saliency map will determine the visual significance of frame areas for appropriate cropping. A motion feature map is constructed to locate moving objects or contents so that possible distortions on them can be avoided. For static scenes, a local-significance-aware seam carving scheme based on one-dimensional gradients is applied. A SSIM-based blur detection method is also developed to extract sharp foreground objects. The experimental results show that the proposed method performs well in various kinds of video shots.

关键词： Videos Visualization Feature extraction Object recognition Encoding Distortion Image coding

来源：评论

学校读者我要写书评

暂无评论

Industrial Application of the Shapley value-based Redispatch Cost Allocation to Large-Scale Power Grids requires AC Optimal Power Flow

arXiv

引用

arXiv 2024年

作者： Bauer, Rebecca Dai, Xinliang Hagenmeyer, Veit Institute of Automation and Applied Informatics Karlsruhe Institute of Technology Karlsruhe Germany

A burgeoning topic in the current energy transition are the huge costs of redispatch congestion management (CM) in large transmission systems. One of the German transmission system operators (TSOs) raised the critical inquiry of how to allocate the redispatch costs amongst TSOs in an equitable and beneficial way. Previously, a Shapley value-based approach has been introduced on small test grids, using the linear DC approximation of optimal power flow (OPF). However, within the application of CM, its feasibility and accuracy for large-scale power grids and its impact on the computed congestions remain uncertain. Therefore, this study investigates the applicability of the DC OPF compared to the exact AC OPF with regard to the Shapley values, for both small and large-scale grids. Numerical simulation shows significant differences in the congested lines, the overall redispatch costs, and the Shapley values. These findings suggest that for future CM, the TSOs should further investigate AC OPF solutions. Copyright © 2024, The Authors. All rights reserved.

关键词： Costs

来源：评论

学校读者我要写书评

暂无评论

Vibrational Control for Energy Balancing in Modular Multilevel Converters

Vibrational Control for Energy Balancing in Modular Multilev...

引用

International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)

作者： Adam Kastner Lutz Gröll Veit Hagenmeyer Institute for Automation and Applied Informatics Karlsruhe Institute of Technology Karlsruhe Germany

ISBN: (数字)9798350365771

ISBN: (纸本)9798350365788

In order to balance the stored energy between the branches of a modular multilevel converter, an output-invisible control allocation strategy is used. A vibrational control approach, modeled via higher-order averaging methods, is applied to provide additional input variables that enable controlling the one-period average of all branch energies at the same time. Stability analysis of the linearized control loop including the moving average filter is performed using a delay model approach, for which careful handling of a removable singularity at zero is necessary. A finite-order discrete-time approximation of the delay system is used for optimization of the controller parameters. The potential of the proposed control scheme is demonstrated in simulation.

关键词： Electrical engineering Multilevel converters Electric potential Input variables Delay systems Stability analysis Delays Resource management Optimization Energy storage

来源：评论

学校读者我要写书评

暂无评论

A New Communication Concept for Efficient Configuration of Energy Systems Integration Co-Simulation

A New Communication Concept for Efficient Configuration of E...

引用

International Workshop/Symposium on Distributed Simulation and Real-Time Applications (DS-RT)

作者： Anselm Erdmann Hüseyin K. Çakmak Uwe Kühnapfel Veit Hagenmeyer Institute for Automation and Applied Informatics Karlsruhe Institute of Technology Karlsruhe Germany

By combining several existing simulators, co-simulation approaches are designed for efficient simulator development. Especially for energy systems integration simulations involving different physical domains, co-simulation is the required approach. However, co-simulation setup is complex, time-consuming, and additionally, error-prone for large simulations, especially if visualizations are included. Therefore, for an intensive information exchange between simulators, the present paper introduces a new network-based communication concept including the co-simulation setup procedure. The proposed setup concept enables an efficient configuration for the coupling of distributed simulation modules. The evaluation of the implemented concept on an exemplary power grid simulation with integration of power-to-gas and gas-to-power components and power grid visualization shows the ability for efficient handling of a high amount of exchanged simulation data.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Storage scheduling with stochastic uncertainties: Feasibility and cost of imbalances

arXiv

引用

arXiv 2018年

作者： Appino, Riccardo Remo González Ordiano, Jorge Ángel Mikut, Ralf Hagenmeyer, Veit Faulwasser, Timm Institute for Automation and Applied Informatics Karlsruhe Institute of Technology Karlsruhe Germany

Dispatchability of renewable energy sources and inflexible loads can be achieved using a volatility-compensating energy storage. However, as the future power outputs of the inflexible devices are uncertain, the computation of a dispatch schedule for such aggregated systems is non-trivial. In the present paper, we propose a novel scheduling method that enforces the feasibility of the dispatch schedule with a pre-determined probability based on a description of the operation of the system as a two-stage decision process. Thereby, a crucial point is the use of probabilistic forecasts, in terms of cumulative density function, of the inflexible energy consumption/production profile. Then, for the sake of comparison, we introduce a second scheduling method based on state-of-the-art scenario optimization, where, unlike the proposed method, the focus is on the minimization of the expected final cost. We draw upon simulations based on real consumption and production data to compare the methods and illustrate our findings. Copyright © 2018, The Authors. All rights reserved.

关键词： Stochastic programming

来源：评论

学校读者我要写书评

暂无评论

HARDWARE-BASED MICROGRID COUPLED TO REAL-TIME SIMULATED POWER GRIDS FOR EVALUATING NEW CONTROL STRATEGIES IN FUTURE ENERGY SYSTEMS

arXiv

引用

arXiv 2024年

作者： Kyesswa, Michael Wiegel, Friedrich Wachter, Jan Kühnapfel, Uwe Waczowicz, Simon Hagenmeyer, Veit Institute for Automation and Applied Informatics Karlsruhe Institute of Technology Karlsruhe Germany

The design of new control strategies for future energy systems can neither be directly tested in real power grids nor be evaluated based on only current grid situations. In this regard, extensive tests are required in laboratory settings using real power system equipment. However, since it is impossible to replicate the entire grid section of interest, even in large-scale experiments, hardware setups must be supplemented by detailed simulations to reproduce the system under study fully. This paper presents a unique test environment in which a hardware-based microgrid environment is physically coupled with a large-scale real-time simulation framework. The setup combines the advantages of developing new solutions using hardware-based experiments and evaluating the impact on large-scale power systems using real-time simulations. In this paper, the interface between the microgrid-under-test environment and the real-time simulations is evaluated in terms of accuracy and communication delays. Furthermore, a test case is presented showing the approach's ability to test microgrid control strategies for supporting the grid. It is observed that the communication delays via the physical interface depend on the simulation sampling time and do not significantly affect the accuracy in the interaction between the hardware and the simulated grid. © 2024, CC BY-SA.

关键词： Hardware-in-the-loop simulation

来源：评论

学校读者我要写书评

暂无评论

A New Julia-Based Parallel Time-Domain Simulation Algorithm for Analysis of Power System Dynamics

A New Julia-Based Parallel Time-Domain Simulation Algorithm ...

引用

International Workshop/Symposium on Distributed Simulation and Real-Time Applications (DS-RT)

作者： Michael Kyesswa Philipp Schmurr Hüseyin K. Çakmak Uwe Kühnapfel Veit Hagenmeyer Institute for Automation and Applied Informatics Karlsruhe Institute of Technology Karlsruhe Germany

ISBN: (数字)9781728173436

ISBN: (纸本)9781728173443

The present paper describes a new parallel time-domain simulation algorithm using a high performance computing environment - Julia - for the analysis of power system dynamics in large networks. The parallel algorithm adapts a parallel-in-space decomposition scheme to a previously sequential algorithm in order to develop a new parallelizable numerical solution of the power system equations. The parallel-in-space decomposition is based on the block bordered diagonal form, which reformulates the network admittance matrix into sub-blocks that can be solved in parallel. For the optimal spatial decomposition of the network, a new extended graph partitioning strategy is developed for load balancing and minimizing the communication between subnetworks. The new parallel simulation algorithm is tested using standard test networks of varying complexity. The simulation results are compared to those obtained from a sequential implementation in order to validate the solution accuracy and to determine the performance improvement in terms of computational speedup. Test simulations are conducted using the ForHLR II supercomputing cluster and show a huge potential in computational speedup with increasing network complexity.

关键词： Mathematical model Computational modeling Power system stability Power system dynamics Heuristic algorithms Partitioning algorithms Analytical models

来源：评论

学校读者我要写书评

暂无评论

Experimental Analysis of Immersion & Invariance Adaptive Control for an Interleaved DC/DC Boost Converter with Unknown Load Type

Experimental Analysis of Immersion & Invariance Adaptive Con...

引用

IEEE PES Innovative Smart Grid Technologies Conference Europe (ISGT Europe)

作者： Jan Wachter Lutz Gröll Veit Hagenmeyer Karlsruhe Institute of Technology Institute for Automation and Applied Informatics Karlsruhe Germany

The retrofit of the energy system leads to new challenges for the control of power electronic devices. To account for parametric uncertainties of passive elements, or unknown ambient conditions in real-world applications, the use of proportional-integral (PI) controllers in cascaded schemes is common. Observer based adaptive control approaches can be leveraged to accommodate such uncertainties and at the same time provide parameter estimates and enable model based control approaches. From an application perspective, the question arises about the consequences of wrong modelling assumptions, for example regarding the often unknown load type. In this work an interleaved DC/DC boost converter is considered, that supplies a DC-bus to which generally unknown loads can be connected, such as a grid-tied three phase inverter. This paper illustrates the design of an observer based adaptive controller using the Immersion & Invariance framework with an energy shaping plus damping injection passivity based controller. A highly simplified, large signal plant model as well as the assumption of a purely resistive load are used for the design. The provided experimental results show that the adaptive controller is able to cope with violations of the modeling assumptions concerning the load type in a real-world application scenario.

关键词：

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：