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检索条件"机构=State Key Lab. of Control and Simulation of Power System and Generation Equipments"

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Failure analysis of fan mill in thermal power plant 68

Failure analysis of fan mill in thermal power plant

引用

68th Society for Machinery Failure Prevention Technology Conference: Technology Solutions for Affordable Sustainment, MFPT 2014

作者： Liu, Chao Jiang, Dongxiang Chu, Fulei Department of Mechanical Engineering Tsinghua University Beijing100084 China State Key Laboratory of Control and Simulation of Power System and Generation Equipments Department of Thermal Engineering Tsinghua University Beijing100084 China

Fan mill is an important device in thermal plants, which supply coal power to boiler. Crack failures recently occurred in pulverizing wheels of fan mills in a power plant in China. The cracks happens in quite a few pulverizing wheels and they affect the normal operation. To find out the root cause of the cracks, Finite Element Analysis (FEA) of the pulverizing wheel is carried out in this work. The assembly with real dimensions is modelled to calculate the concentrated stress and strain with centrifugal load, driving load, and operational temperature taken into account. Contact effects are included in the finite element model as well as nonlinear material property. Based on the analysis, the crack causes are determined: (i) the initial stress exceeds the yield limit in normal operational condition, resulting low safety coefficient;(ii) the stress increases significantly in the worn pulverizing wheel, where the risk of failure is greatly increased.

关键词： Cracks

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A phase-disposition PWM method for DC voltage balance in cascaded h-bridge rectifier

A phase-disposition PWM method for DC voltage balance in cas...

引用

作者： Tao, Xinghua Li, Yongdong Sun, Min State Key Lab of Control and Simulation of Power System and Generation Equipments Dept. of Electrical Engineering Tsinghua University China Dept. of Electrical Engineering Naval Engineering University China

ISBN: (纸本)9788986510119

In this paper, a novel control scheme for cascaded H-Bridge rectifier (CHBR), which can be used as the primary end of high voltage high power multilevel converters, is presented. The controller is similar with the one for single phase rectifier. To improve the performance of the controller, notch filter and proportion resonance (PR) controller are employed and the discrete methods for them are discussed in detail. The different function of CHBR controller from the single rectifier is for voltage balancing. Therefore, the phase-disposition technology, which is used in the multilevel converter, is introduced to eliminate the voltage error from the expected value. With this approach, the states of the switches of the CHBR are decided correctly by the practical condition and then the DC-link capacitors of the cells are controlled to charge or discharge in the way which results to voltage balancing. The effectiveness of the proposed approach is verified by experimental results.

关键词： controllers

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A PI-based control scheme for primary cascaded H-bridge rectifier in transformerless traction converters

A PI-based control scheme for primary cascaded H-bridge rect...

引用

作者： Xinghua, Tao Yongdong, Li Min, Sun State Key Lab of Control and Simulation of Power System and Generation Equipments Dept. of Electrical Engineering Tsinghua University China Dept. of Electrical Engineering Naval Engineering University China

ISBN: (纸本)9788986510119

Cascaded H-Bridge rectifier (CHBR) is a more attractive solution in traction application for its transformerless structure. Because of the currents of different cells are exactly the same one, it is a challenge job to regulate the voltages of cells with only one current controller. In this paper, a PI-based control scheme is presented to deal with the voltages balance issue in CHBR. To satisfy the demand of rectifier such as unity power factor and regulated output DC voltages, the proposed control scheme consists of two parts. One is for shaping the grid current waveform and regulating the sum of DC-link voltages of all the cells;the other one is for balancing DC-link voltages. The latter is more concerned in this paper and is discussed in detail especially. simulations and experiments are carried on. The results verified the feasibility and effectiveness of the proposed scheme.

关键词： Electric rectifiers

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Summary of health index theory and application of state maintenance equipment 5

Summary of health index theory and application of state main...

引用

5th International Conference on Reliability of Electrical Products and Electrical Contacts, ICREPEC 2014

作者： Cheng, Lin Manjun, L.I.U. Peng, Feijin Dept. of Elec. Eng. Tsinghua University State Key Lab. of Control and Simulation of Power Systems and Generation Equipments Beijing100084 China Guangdong Power Grid Company Foshan Power Supply Bureau Foshan528010 China

ISBN: (纸本)9789881532329

This paper describes several methods for condition-based maintenance, introduced CBM, RCM development process, the main theoretical logic, techniques and practices. Focuses on the health index based on equipment maintenance strategies, namely CBRM. Focused on the development of narrative context, theoretical foundation, model healthy index. And for its application in power transformers were introduced.

关键词： Condition based maintenance

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Fast evaluation of the lightning electromagnetic field in the time domain with an adaptive piecewise approximation of channel base current

Fast evaluation of the lightning electromagnetic field in th...

引用

作者： Lee, Jae-Bok Zou, Jun Li, Mo Chang, Sughun Electrical Environment Research Center Korea Electrotechnology Research Institute Changwon Korea Republic of State Key Lab. of Control and Simulation of Power Systems and Generation Equipments Department of Electrical Engineering Tsinghua University Beijing China

Purpose - A fast algorithm is proposed to calculate the lightning electromagnetic field over a perfectly conducting earth surface. Design/methodology/approach - The channel base current is approximated by a number of sub-domain quadratic functions using the proposed adaptive sampling technique, and the derivative and integral of the channel base current with respect to time can be analytically expressed. With the help of these approximations, the ideal electromagnetic field of the lightning channel can be evaluated along the lightning channel with respect to the height. Findings - The computational time can be greatly reduced using the proposed approach to evaluate the electromagnetic field of a lightning channel in the time domain. Originality/value - The adaptive sampling technique is a general-purposed approach, which can be potentially used in other applications to fit a function with the minimal number of intervals. © Emerald Group Publishing Limited.

关键词： Electromagnetic fields

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Research on General Terminal of Intelligent Measurement and control of Distribution Network Based on Open Architecture

Research on General Terminal of Intelligent Measurement and ...

引用

2022 IEEE Conference on Telecommunications, Optics and Computer Science, TOCS 2022

作者： Xiao, Xiaobing Cai, Yongxiang He, Xiaomeng Li, Yue Ding, Yujie Zhao, Ergang Electric Power Research Institute of Guizhou Power Grid Co. Ltd Guiyang China State Key Lab of Control and Simulation of Power Systems Generation Equipments Dept. of Electrical Engineering Beijing China

ISBN: (纸本)9781665470537

With the continuous advancement of the construction of new power systems, the data information of the power system is increasing exponentially, and the spatiotemporal distribution of the use of smart terminals and electrical equipment is more scattered. Data collection and analysis of traditional power systems will be a huge challenge. In order to meet the actual needs of multi-scenario, multi-service, and changeable measurement and control objects of intelligent distribution network, this paper firstly studies the design of general terminal open architecture for distribution network multi-measurement and control scenarios, proposes a data service architecture based on open architecture, and establishes a self-description-based open architecture design. The unified information model of the Internet of Things protocol, research and development of intelligent measurement, and the controlling of universal terminals meet multiple communication methods, and realize the deployment verification of intelligent measurement. © 2022 IEEE.

关键词： Electric power distribution

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Mathematical expectation modeling of wide-area controlled power systems with stochastic time delay

Mathematical expectation modeling of wide-area controlled po...

引用

IEEE General Meeting power& Energy Society

作者： Chao Lu Xinran Zhang Xiaoyu Wang Yingduo Han State Key Laboratory of Control and Simulation of Power System and Generation Equipments Tsinghua University

ISBN: (纸本)9781467380416

Summary form only given: Communication network brings new challenges such as time delay and data loss to wide-area damping control of power systems. The uncertainty caused by stochastic time delay of network communication increases the difficulty of wide-area control performance analysis. This paper proposes a mathematical expectation modeling approach to model and analyze wide-area controlled power systems considering the effect of stochastic time delay. In the proposed method, mathematical expectation of stochastic time delay distribution is derived to accurately model the impact of communication network on wide-area control performance. The theoretical frame of the proposed modeling approach is presented and the effectiveness of the method is verified through the simulation of a power system with 8 generators and 36 nodes.

关键词： Mathematical model power systems Delay effects Stochastic processes control systems Data models Communication networks

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A novel protection scheme for two-phase faults in power distribution system with neutral ungrounded

A novel protection scheme for two-phase faults in power dist...

引用

12th IET International Conference on Developments in power system Protection, DPSP 2014

作者： Shi, Shengxing Lei, Aoyu Li, Xin Dong, Xinzhou State Key Lab of Control and Simulation of Power Systems and Generation Equipments Department of Electrical Engineering Tsinghua University Beijing 10084 China Shibei Power Supply Company Shanghai Municipal Electric Power Company Shanghai China

ISBN: (纸本)9781849198349

A novel protection scheme for two-phase faults in power distribution system with neutral ungrounded is presented. The feasibility of tripping single-phase circuit when a phase-tophase or two-phase-to-ground fault occurs is studied with induction motor loads as the focus. The paper at first analyses the effect of a induction motor runs with one phase cut off theoretically. And then a real power distribution system model with 110kV, 35kV and 6kV voltage levels is built in PSCAD/EMTDC. Three feasibility criteria are proposed for motors in continuous operation with single-phase opened. At last, the novel protection scheme is testified in simulation with protection time and reclosing time as variables respectively. The results verify that the scheme is feasible and power supply reliability is improved.

关键词： Induction motors

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Circuit breaker arc fault detection based on fault recording data in HVDC converter station 15

Circuit breaker arc fault detection based on fault recording...

引用

15th International Conference on Developments in power system Protection, DPSP 2020

作者： Wang, Bin Dong, Xinzhou Yu, Bin Xie, Min Wang, Haigang State Key Lab of Control and Simulation of Power Systems and Generation Equipments Department of Electrical Engineering Tsinghua University Beijing10084 China Anhui Electric Power Company Dispatching Center Anhui Hefei230061 China

ISBN: (纸本)9781713827894

Arc fault occurs easily when circuit breakers (CB) cut the AC filters circuits in HVDC substation frequently. A transient arc model and online detection method are proposed in this paper. The proposed arc model is based on the conventional three stages arc model and Mayr arc model, the simulation results coincide with the actual recorded data well. and also, by utilizing the zero sequence arc current, the online arc detection method based on first order accumulation is introduced. simulation results and actual arc fault data proved the correctness and accuracy of proposed arc fault detection algorithm. © 2020 IET Conference Publications.

关键词： Electric circuit breakers

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Research on Equalization Effect of Dynamic Reconfigurable Battery Management system

Research on Equalization Effect of Dynamic Reconfigurable Ba...

引用

2019 IEEE Sustainable power and Energy Conference, iSPEC 2019

作者： Wan, Yuxiang Cheng, Lin Jiang, Yi Wang, Zhidong Liu, Mei Tsinghua University State Key Lab. of Control and Simulation of Power System and Generation Equipment Beijing China State Grid Corporation of China State Grid Economic and Technological Research Institute Corporation Limited Beijing China

ISBN: (纸本)9781728149301

The battery differences not only affect the reliability and security of battery packs but also accelerate the decline of the packs' life. Although battery management systems (BMS) and equalization circuit can be used to balance the differences, only the whole battery pack can be protected with high-cost and complex circuits. Dynamic reconfigurable battery management system (DRBMS) based on networked control has a simple principle and can shield the differences of battery cells. This paper designs experiments for the dynamic reconfigurable battery network technology and makes a contrast with the traditional BMS. Through the analysis of voltage, SOC difference and dynamic resistance during charging and discharging, the results show that DRBMS has better voltage and capacity equalization effect than BMS. The cells of paralleled battery packs can be fully charged/released in DRBMS. It is also verified that DRBMS is applicable on decommissioned bus battery packs which are of larger differences and the ladder utilization. © 2019 IEEE.

关键词： Battery management systems

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