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作者： Zhang, Kuize Yin, Xiang Zamani, Majid ACCESS Linnaeus Center School of Electrical Engineering KTH Royal Institute of Technology Stockholm10044 Sweden Department of Automation Key Laboratory of System Control and Information Processing Shanghai Jiao Tong University Shanghai200240 China Computer Science Department University of Colorado Boulder BoulderCO80309 United States

In this paper, we propose several opacity-preserving (bi)simulation relations for nondeterministic transition systems (NTSs) in terms of initial-state opacity, current-state opacity, K-step opacity, and infinite-step opacity. We also show how one can leverage quotient constructions to compute such relations. As a result, although the opacity verification problem for infinite NTSs is generally undecidable, if one can find such an opacity-preserving relation from an infinite NTS to a finite one, the (lack of) opacity of the infinite NTS can be easily verified over the finite one, which is decidable. © 1963-2012 IEEE.

关键词： Opacity

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Fabrication of highly reliable joint based on Cu/Ni/Sn double-layer powder for high temperature application

Fabrication of highly reliable joint based on Cu/Ni/Sn doubl...

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作者： Xu, Hongyan Shen, Yaochun Hu, Yihua Li, Jianqiang Xu, Ju Beijing Engineering Laboratory of Electrical Drive System and Power Electronic Device Packaging Technology Micro-Nano Fabrication Technology Department Institute of Electronic Engineering Chinese Academy of Sciences Beijing100190 China University of Chinese Academy of Sciences Beijing100049 China School of Electrical Engineering Electronics and Computer Science University of Liverpool Brownlow Hill LiverpoolL69 3GJ United Kingdom State Key Laboratory of Multiphase Complex System Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China

A highly reliable three-dimensional network structure joint was fabricated based on Cu/Ni/Sn powder with double-layer coatings and transient liquid phase bonding (TLPB) technology for high temperature application. The Cu/Ni/Sn joint is characterized by Cu metal particles embedded in the matrix of (Cu,Ni)6Sn5/Ni3Sn4 intermetallic compounds (IMCs), with a low void ratio, and can be reflowed at low temperatures (6Sn5/ Ni3Sn4 IMCs, and the Cu/Ni/Sn joint had a lower void ratio and a higher shear strength than those of Cu/Sn. The mechanism of the Ni-coating layer inhibiting phase transformation was studied. The high reliable three-dimensional network structure joint based on Cu/Ni/Sn double-layer powder was fabricated for high temperature application. Copyright © International Microelectronics Assembly and Packaging Society

关键词： High temperature applications

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A Multivariate Time Series Classification based Multiple Fault Diagnosis Method for Hydraulic systems

A Multivariate Time Series Classification based Multiple Fau...

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第三十八届中国控制会议

作者： Xiaohang Zhao Ke Zhang Yi Chai Complex system safety and control Key Laboratory of Ministry of Education School of Automation Chongqing University IEEE Department of Electrical and computer engineering Duke University

Hydraulic systems is a class of nonlinear complex *** are many typical characteristics with the systems:multiple functional components,multiple operation modes,space-time coupling work,and monitoring signals for faults are multivariate time series data,*** of the characteristics,fault diagnosis for Hydraulic systems is not *** fault diagnosis methods mostly ignore the multivariable timing characteristics of monitoring signals,it has made many detection and diagnosis(especially for multiple fault)can not keep high accuracy,and some of the methods are not even be able to multiple fault *** at the problem,a multivariate time series classification based diagnosis method is ***,extracting timing characteristics(transformed features)from the time series data collected via sensors by 1-NN ***,training the transformed features by multi-class OVO-SVM to classify multivariate time *** of the method contains single fault and multiple faults conditions,the results show that the method has high accuracy,it can complete multiple-faults classification.

关键词： fault diagnosis hydraulic systems multivariate time series analysis classification

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A Star-Structured LC Resonant Switched Capacitor Equalizer for Lithium-ion Battery Strings

A Star-Structured LC Resonant Switched Capacitor Equalizer f...

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International Future Energy Electronics Conference (IFEEC)

作者： Utpal Kumar Das Kok Soon Tey Mohd Yamani Idna Idris Saad Mekhilef Department of Computer System and Technology University of Malaya Malaysia Power Electronics and Renewable Energy Research Laboratory (PEARL) Department of Electrical Engineering University of Malaya Malaysia

The following topics are dealt with: switching convertors; DC-DC power convertors; power grids; voltage control; invertors; power convertors; distributed power generation; power generation control; power capacitors; m... 详细信息

ISBN: (数字)9781728131535

ISBN: (纸本)9781728131542

关键词： Equalizers Capacitors Switches Batteries Zero current switching Pulse width modulation MOSFET

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Nonlinear Virtual Inertia Control of WTGs for Enhancing Primary Frequency Response and Suppressing Drive-Train Torsional Oscillations

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arXiv 2020年

作者： Liu, Bi Huang, Qi Zhao, Junbo Milano, Federico Zhang, Yingchen Sichuan Provincial Key Lab of Power System Wide-area Measurement and Control University of Electronic Science and Technology of China Chengdu Sichuan611731 China Department of Electrical and Computer Engineering Mississippi State University StarkvilleMS39762 United States School of Electrical and Electronic Engineering University College Dublin Dublin Ireland National Renewable Energy Laboratory GoldenCO80401 United States

Virtual inertia controllers (VICs) for wind turbine generators (WTGs) have been recently developed to compensate the reduction of inertia in power systems. However, VICs can induce low frequency torsional oscillations of the drive train of WTGs. This paper addresses this issue and develops a new nonlinear VIC based on objective holographic feedbacks theory. This approach allows transforming the original nonlinear control into a completely controllable system of Brunovsky’s type. Simulation results under various scenarios demonstrate that the proposed method outperforms existing VICs in terms of suppression of low frequency drive-train torsional oscillations, enhancement of system frequency nadir as well as fast and smooth recovery of WTG rotor speed to the original MPP point before the disturbance. The proposed method is also able to coordinate multiple WTGs. Copyright © 2020, The Authors. All rights reserved.

关键词： Frequency response

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Applications and Services of Solid-State Transformers in Active Distribution Networks -A Critical Review

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IEEE Transactions on Smart Grid 2025年

作者： Wald, Felix Hrishikesan, V.M. Gomis-Bellmunt, Oriol Ji, Haoran Davoudi, Masoud Bidram, Ali Syed, Mazheruddin Josevski, Martina Bruske, Sebastian Kumar, Chandan Alzola, Rafael Pena Colak, Ilknur Pannala, Sanjeev Liserre, Marco Carne, Giovanni De Karlsruhe Institute of Technology Karlsruhe Germany Siemens Denmark Denmark Centre d'Innovacio Tecnologica en Convertidors Estatics i Accionaments Barcelona Spain Tianjin University State Key Laboratory of Intelligent Power Distribution Equipment and System Tianjin China Pacific Gas and Electric San FransiscoCA United States University of New Mexico Department of Electrical and Computer Engineering AlbuquerqueNM United States Energy Advisory WSP UK United Kingdom EATON Germany Maschinenfabrik Reinhausen Regensburg Germany Electronics and Electrical Engineering Department India University of Strathclyde Institute for Energy and Environment Glasgow United Kingdom Schneider Electric Grenoble France Washington State University PullmanWA United States NREL Golden United States Kiel University Power Electronics Kiel Germany

Distribution systems have traditionally received the least attention in the bulk picture of power systems;they are yet the most »critical component» as they directly impact customers' perception and utilities' reputation. While transmission systems have seen abundant literature, innovations, and applications of power electronic-based devices to optimize their performance, distribution systems still require more attention toward a flexible and dynamic scheme to cope with volatile energy consumption and production. As a replacement or enhancement of the traditional ones, Solid-State Transformers can play a central role in the energy management of distribution systems towards this goal, in addition to the mere voltage conversion. This manuscript, developed within the IEEE Task Force on Solid-State Transformer integration in distribution grids, offers a critical review of the Solid-State Transformer potential, services, and technical challenges for its integration in distribution systems. Particular attention is given to scientific trends and open points in the current research that must be addressed before utilities extensively integrate the Solid-State Transformer in distribution systems. © 2010-2012 IEEE.

关键词： power electronics

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Study on Subsynchronous Resonance Damping Control for Series-Compensated DFIG-Based Wind Farm

Study on Subsynchronous Resonance Damping Control for Series...

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Sustainable power and Energy Conference (iSPEC)

作者： Chao Luo Qi Guo Xiangning Xiao A.M Gole Mengjun Liao State Key Laboratory of HVDC Electric Power Research Institute State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing China Electrical and Computer Engineering Department University of Manitoba Winnipeg Canada

ISBN: (纸本)9781728149318

Subsynchronous Resonance (SSR) is a potential threat for long distance power transmission from doubly fed induction generator (DFIG) based wind farms with fixed series compensation (FSC). In this paper, subsynchronous resonance damping control (SSRDC) strategy based on shunt voltage source converter is proposed. Taking account of different series compensation levels and wind speeds, several potential inputs to the SSRDC are investigated. SSRDC control parameters are determined via root locus techniques to ensure the system stability of subsynchronous modes. Considering implementation feasibility in practical project and stability of supersynchronous modes, an enhanced SSRDC is proposed. Impact of transmission line and DFIG parameters and the reactive power compensation to the mitigation effect is investigated. Time domain simulation using PSCAD/EMTDC are carried out to validate the effectiveness of the SSRDC.

关键词： Doubly fed induction generator (DFIG) fixed series capacitor compensation (FSC) Subsynchronous Resonance (SSR) voltage source converter (VSC) Subsynchronous Resonance damping controller Wind farms subsynchronous resonance damped control system stability power transmission reactive compensation series compensation double-fed induction generator TIME-DOMAIN Transmission Lines Compensation depth

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Improved Model Predictive Control for Mitigating False Data Injection on Cascaded H-Bridge Inverters

Improved Model Predictive Control for Mitigating False Data ...

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IEEE PES Asia-Pacific power and Energy engineering Conference (APPEEC)

作者： Rao Rao Zhaoxi Liu Lingfeng Wang Shiying Hou Yingqiao He The State Key Laboratory of Power Transmission Equipment & System Security and New Technology College of Electrical Engineering Chongqing University China Department of Electrical Engineering and Computer Science University of Wisconsin-Milwaukee Milwaukee USA

The cybersecurity of the smart grid is becoming a critical issue to the power systems. Mitigating potential cyberattacks on the control of the power electronic devices is an important concern in the controller design to enhance the resilience of the overall power grid. In this paper, a novel model predictive control (MPC) is proposed for the multilevel cascaded H-bridge inverters considering the false data injection (FDI) attacks. The FDI attack is a vicious attack scenario when the attack signals are injected into the sensors in the cyberphysical systems (CPS). It is shown that FDI signals can effectively penetrate the commonly used Kalman Filter (KF) based state estimation and jeopardize the control of the inverters. The k-Nearest Neighbors (KNN) algorithm is employed in the proposed scheme to mitigate the FDI attacks. The proposed KNN-based MPC scheme was tested with various types of attack signals. The results show that the proposed scheme exhibits a robust performance in the face of the malicious FDI attacks.

关键词： Inverters Control systems Predictive control Sensors Kalman filters power system stability Mathematical model

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Integrated Response to Boost Distribution system Resilience Against Windstorms

Integrated Response to Boost Distribution System Resilience ...

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Sustainable power and Energy Conference (iSPEC)

作者： Gang Wang Zhaoxi Liu Lingfeng Wang Bo Hu Kaigui Xie Jiahao Yan State Key Laboratory of Power Transmission Equipment & System Security College of Electrical Engineering Chongqing University 400044 China Department of Electrical Engineering and Computer Science University of Wisconsin-Milwaukee Milwaukee WI USA

Improving distribution system resilience is one of the urgent tasks for the modern society. This paper proposes a novel integrated preventive and emergency response model for system operators to boost the distribution system resilience considering all possible component damage statuses. Topology reconfiguration and generation redispatch are allowed in both the preventive response (PR) and emergency response (ER), while load curtailment is only deployed in the ER. A two-stage stochastic mixed-integer optimization model is developed for the integrated optimization problem, which is solved by the progressive hedging (PH) algorithm. Case studies on the IEEE 33-bus system and a 69-bus distribution system validate the correctness and effectiveness of the proposed model. Sensitivity analysis is also carried out to evaluate the influence of the weather severity and generator availability. The key conclusions of this paper include the following: 1) integrated response (IR) improves distribution system resilience with the minimum expected cost; and 2) integrated response is preferable comparing with the individual PR or ER.

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Parallel computing of multi-contingency optimal power flow with transient stability constraints

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Protection and Control of Modern power systems 2018年第1期3卷 213-222页

作者： Yude Yang Anjun Song Hui Liu Zhijun Qin Jun Deng Junjian Qi Guangxi Key Laboratory of Power System Optimization and Energy Technology Guangxi UniversityNanningChina State Grid Shaanxi Electric Power Research Institute Xi’anChina Department of Electrical and Computer Engineering University of Central FloridaOrlandoFL 32816USA

To deal with the high dimensionality and computational density of the Optimal power Flow model with Transient Stability Constraints(OTS),a credible criterion to determine transient stability is proposed based on swing curves of generator rotor and the characteristics of transient *** this method,the swing curves of all generator rotors will be independent one ***,when a parallel computing approach based on the MATLAB parallel toolbox is used to handle multi-contingency cases,the calculation speed is improved ***,numerical simulations on three test systems including the NE-39 system,the IEEE 300-bus system,and 703-bus systems,show the effectiveness of the proposed method in reducing the computing time of OTS calculation.

关键词： power system Transient stability Multi-contingency Optimal power flow Parallel computing

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