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International Conference on Automation and Computing (ICAC)

作者： Yaowang Li Shihong Miao Xing Luo Jihong Wang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science & Technology China School of Engineering University of Warwick U.K.

When energy storage is involved in the power system scheduling, the new challenge is presented as the storage facilities can be considered as either a generator (discharging) or a load (charging). To address this challenge, the paper proposes a method of optimization of power system scheduling with the first generation of compressed air energy storage (CAES) This model takes gas consumption cost as one of the operation cost, and it can reflect inherent operation constrains of a first generation CAES plant. With simplifications of the CAES system model, the relationship between the key variables used in CAES scheduling model are identified. An optimization model for scheduling of wind generations and CAES combined system is then developed. The objective of this optimization scheduling model is to maximize the combined system operation profit which involves in selling electricity revenue, penalty for deviation from declared output and gas consumption cost of CAES. Simulation studies are carried out with the operation data of the Huntorf CAES plant. The simulation results show that the optimization model works well for power system scheduling while the CAES and wind power generations are presented.

关键词： Energy storage Reservoirs Atmospheric modeling Wind power generation Turbines Optimized production technology

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Active damping control of multiple resonances for grid-connected inverter with long transmission cable

Active damping control of multiple resonances for grid-conne...

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IEEE International Conference on Industrial technology (ICIT)

作者： Weibiao Wu Li Peng Manlin Chen Tiliang Wen Yang Li Ji Lei Fangming Dong State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan Hubei People's Republic of China

ISBN: (纸本)9781467380768

The long transmission cable with non-negligible parasitic capacitor and inductance is usually applied to transmit power energy in distributed generator system. As a result, LCL-type grid-connected inverter introduces the potential multiple harmonic resonances issue more sensitively compared with pure equivalent inductance of the cable. To eliminate these resonances, this paper focuses on active damping method which notch filter based on low pass filter (LPF-NF) is proposed without any additional sensor. Furthermore, compared with the existing active damping method based on series notch filter (SNF), the proposed LPF-NF can not only lessen computation burden relatively, but also preserve robustness and transient performance. Lastly, the effectiveness and correctness of the proposed LPF-NF is examined by comparative simulations.

关键词： Decision support systems Economic indicators

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Passivity Control Based on Euler-Lagrangian Model for D-STATCOM With LCL Filter

Passivity Control Based on Euler-Lagrangian Model for D-STAT...

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World Congress on Intelligent Control and Automation

作者： Jinmu Lai Xianggen Yin Ertao Lei Yu Chen Xin Yin School of Electrical and Electronic Engineering State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology

ISBN: (纸本)9781467384155

This paper deals with a novel control method for D-STATCOM with LCL filter. LCL filter can effectively attenuate high frequency harmonic of compensation current. By taking the energy dissipation properties of STATCOM with LCL filter into consideration, this paper proposes passivity based control method with Euler-Lagrangian (EL) model and damping injection. The stability of the controllers is analyzed in detail to satisfy static and dynamic performance as well as its ability of suppressing harmonics. The correctness and validity of the proposed control method was verified by the simulation tests based on Matlab/Simulink platform.

关键词： Automatic voltage control Power harmonic filters Mathematical model Damping Two dimensional displays Resistance Harmonic analysis

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Fast valve power loss evaluation method for modular multi-level converter operating at high-frequency

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Protection and Control of Modern Power Systems 2016年第1期1卷 26-36页

作者： Fen Tao Zhujun Xie Jie Cheng Chenghao Li Lu Zhao Jinyu Wen PowerChina Hubei Electric Engineering Corporation WuhanHubei Province 430040China State Key Laboratory of Advanced Electromagnetic Engineering and Technology(Huazhong University of Science and Technology) WuhanHubei Province 430074China.

There is no common accepted way for calculating the valve power loss of modular multilevel converter(MMC).Valve power loss estimation based on analytical calculation is inaccurate to address the switching power loss and valve power loss estimation based on detailed electro-magnetic simulation is of low *** solve this problem,a method of valve power loss estimation based on the detailed equivalent simulation model of MMC is *** of valve power loss analysis of 201-level 500MW MMC operating at 50Hz~1000Hz are *** is seen that the valve power loss of a MMC increased by 12,40 and 93%under 200Hz,500Hz and 1000Hz operating *** article concludes that in a device with isolated inner AC system,MMC operating at higher frequency will be more competitive than typical 50Hz/60Hz MMC with moderate increase of operating power loss and significant reduction of the size of the AC components.

关键词： Modular multilevel converter(MMC) Medium-high frequency Valve power loss Conduction power loss Switching power loss

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Investigation of Wireless Power Transfer for Smart Grid On-line Monitoring Devices under HV Condition

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Procedia Computer Science 2016年 83卷 1307-1312页

作者： Junfeng Chen Zhaoyang Hu Shengming Wang Yongzhi Cheng Minghai Liu School of Electrical and Electronic Engineering State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China Engineering Research Center for Metallurgical Automation and Detecting Technology Ministry of Education Wuhan University of Science and Technology Wuhan 430081 China

Magnetically coupled resonant wireless power transfer (WPT) has been employed in many applications, such as wireless charging of portable electronic devices and electric vehicles. This technology can also provide solutions for power transfer in complex environment and special scenario with mid-range transfer distance and acceptable transfer efficiency. In this paper, a mid-range WPT system is designed to provide an effective solution for power supply to smart grid on-line monitoring devices in high voltage (HV) on-site condition. Both the model, design, and experimental implementation of a two-coil system are represented. To find out the transfer characteristic of the proposed mid-range WPT system, the circuit model, exciting frequency, coupling, output power and transfer efficiency are analyzed based on the circuit and magnetic principles. Some key points about the optimal working area for the mid-range WPT system are demonstrated. Finally, a prototype system with transfer distance 1.1 meter for 110 kV HV power cables is built to verify the effectiveness of the regular law of system. By carefully tuning the circuit parameters, the prototype is able to deliver 20W power through 1.1 meter distance with 20.23% efficiency.

关键词： Wireless power transfer (WPT) Mid-range Smart Grid HV power On-line Monitoring Devices

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Network Reconfiguration for Loss Reduction in Distribution Network with Distributed Generation

Network Reconfiguration for Loss Reduction in Distribution N...

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2016 IEEE International Conference on Power and Renewable Energy （ICPRE 2016）

作者： Bo Ruan Xi Chen Jun Huang Zhen Mei Yu Li Research Institute of Economics and Technology Hubei Electric Power Company Limited State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science & Technology

This paper proposed a novel algorithm of network reconfiguratoin based on improved quantum particle swarm optimization（QPSO）, which can be used for loss reduction in distribution network with distributed generation. First, the network topology is analysed on the basis of branch loop incidence matrix and layered branch incidence matrix. second, calculate the network loss by layered forward-backward sweep method. Then, an improved QPSO is proposed where the disturbance factor is introduced, based on which the network reconfiguration is put forward. Finally, the proposed algorithm is proved to be effective by applying to PG＆E69 bus system and the Tai-Power 11.4-kV distribution system.

关键词： loss reduction distribution network reconfiguration quantum-behaved particle swarm optimization distributed generation（DG）

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Study of the Collector-Line-Current-Protection Setting in Centralized Accessed Double-Fed Wind Farms

Study of the Collector-Line-Current-Protection Setting in Ce...

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IEEE Power and Energy Society General Meeting

作者： Hang Yang Zhe Zhang Xianggen Yin Fan Xiao Xuanwei Qi Yutian Ye State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical & Electronic Engineering Huazhong University of Science & Technology State Grid Zhejiang Electric Power Company

ISBN: (纸本)9781509041695

Comparing to the traditional generator, wind turbines have special short circuit current traits, which gives rise to many new problems in power system's protection control. Traditional protection methods can't meet the requirement of the safe operation of the power system. This paper firstly analyzes the double feed induction generator. Then for the typical wind farms, the effect of the collective wires' current protection is considered when wind farms are centralized accessed to the power system. In the end, simulation is used to verify the analysis.

关键词： Current protection Failure characteristics Relay protection setting Wind turbines Wind Energy Conversion Systems current protection power systems Wind farms Power system protection DOUBLE FEED Safe handling

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Supplementary damping control of VSC-HVDC for interarea oscillation using goal representation heuristic dynamic programming

Supplementary damping control of VSC-HVDC for interarea osci...

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12th IET International Conference on AC and DC Power Transmission (ACDC 2016)

作者： Yu Shen Weibiao Chen Wei Yao Shiwu Liao Jinyu Wen State Key Laboratory of Advanced Electromagnetic Engineering and Technology (Huazhong University of Science and Technology) Wuhan 430074 Hubei Province P.R. China

The interarea oscillation is one of the main challenges for the secure and stable operation of a large-scale interconnected AC/DC power system. As the voltage source converter high voltage direct current (VSC-HVDC) transmission system features the fast and flexible power regulation capability, supplementary damping controller (SDC) can be designed for VSC-HVDC to suppress interarea oscillation in a large-scale AC/DC power system. In this paper, an innovative adaptive dynamic programming approach, namely the goal representation heuristic dynamic programming (GrHDP), is proposed to design SDC for VSC-HVDC. The GrHDP based SDC consists of three neural networks, which can automatically form an internal adaptive reward signal to facilitate better mapping between the system state and the control action. Therefore, the GrHDP based SDC can significantly improve the dynamic performance of the power system. Without knowing the exact mathematic model of the power system, the GrHDP based SDC still conducts the quick learning and universal control characteristics and has strong adaptability, which is superior to the conventional lead-lag SDC. Case study is undertaken based on a two-area four machine power system with one VSC-HVDC transmission line. The conventional lead-lag SDC has also been studied for comparison. Simulation results show that the proposed GrHDP based SDC has better performance in damping interarea oscillation than that of the conventional lead-lag SDC in a wide range of system operating conditions.

关键词： goal representation heuristic dynamic programming (GrHDP) interarea oscillation VSC-HVDC damping control

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Number and dimensional distribution of stems near the anode in a 1m air gap under positive pulse

Number and dimensional distribution of stems near the anode ...

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International Conference on Lightning Protection (ICLP)

作者： Xiangen Zhao Junjia He Hengxin He Yishi Yue Weijiang Chen State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China State Grid Corporation of China Beijing China

ISBN: (纸本)9781509048434

Characteristics of stem play an important role in the leader inception and development, and deserve comprehensive studies. In order to observe the stem experimentally, a schlieren system was established. Experiments in a 1m cone-plane gap under positive impulse voltage were carried out and the discharge current and schlieren photographs of discharge process were recorded synchronously with associated analysis. Experimental results showed that the number of stems were always more than one at the initial stage of the discharge in long gaps. Only 3% of the cases had one stem in our experiments. The number of stems followed a normal distribution with mean 4.01 and standard deviation 1.26. The first corona charge did not have a significant impact on the number of the stems. These stems were concentrated near the cone tip in the range -4 to 4 pixel. Using the method for the position of the stems described in this paper, the distribution of the stems followed a normal distribution with an average of -0.44 and standard deviation 4.31.

关键词： Discharges (electric) Corona Electrodes Lenses Cameras Standards Light emitting diodes

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All-sky search for continuous gravitational waves from isolated neutron stars in the early O3 LIGO data

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Physical Review D 2021年第8期104卷 082004-082004页

作者： R. Abbott T. D. Abbott S. Abraham F. Acernese K. Ackley A. Adams C. Adams R. X. Adhikari V. B. Adya C. Affeldt D. Agarwal M. Agathos K. Agatsuma N. Aggarwal O. D. Aguiar L. Aiello A. Ain P. Ajith T. Akutsu K. M. Aleman G. Allen A. Allocca P. A. Altin A. Amato S. Anand A. Ananyeva S. B. Anderson W. G. Anderson M. Ando S. V. Angelova S. Ansoldi J. M. Antelis S. Antier S. Appert Koya Arai Koji Arai Y. Arai S. Araki A. Araya M. C. Araya J. S. Areeda M. Arène N. Aritomi N. Arnaud S. M. Aronson H. Asada Y. Asali G. Ashton Y. Aso S. M. Aston P. Astone F. Aubin P. Aufmuth K. AultONeal C. Austin S. Babak F. Badaracco M. K. M. Bader S. Bae Y. Bae A. M. Baer S. Bagnasco Y. Bai L. Baiotti J. Baird R. Bajpai M. Ball G. Ballardin S. W. Ballmer M. Bals A. Balsamo G. Baltus S. Banagiri D. Bankar R. S. Bankar J. C. Barayoga C. Barbieri B. C. Barish D. Barker P. Barneo F. Barone B. Barr L. Barsotti M. Barsuglia D. Barta J. Bartlett M. A. Barton I. Bartos R. Bassiri A. Basti M. Bawaj J. C. Bayley A. C. Baylor M. Bazzan B. Bécsy V. M. Bedakihale M. Bejger I. Belahcene V. Benedetto D. Beniwal M. G. Benjamin T. F. Bennett J. D. Bentley M. BenYaala F. Bergamin B. K. Berger S. Bernuzzi D. Bersanetti A. Bertolini J. Betzwieser R. Bhandare A. V. Bhandari D. Bhattacharjee S. Bhaumik J. Bidler I. A. Bilenko G. Billingsley R. Birney O. Birnholtz S. Biscans M. Bischi S. Biscoveanu A. Bisht B. Biswas M. Bitossi M.-A. Bizouard J. K. Blackburn J. Blackman C. D. Blair D. G. Blair R. M. Blair F. Bobba N. Bode M. Boer G. Bogaert M. Boldrini F. Bondu E. Bonilla R. Bonnand P. Booker B. A. Boom R. Bork V. Boschi N. Bose S. Bose V. Bossilkov V. Boudart Y. Bouffanais A. Bozzi C. Bradaschia P. R. Brady A. Bramley A. Branch M. Branchesi J. E. Brau M. Breschi T. Briant J. H. Briggs A. Brillet M. Brinkmann P. Brockill A. F. Brooks J. Brooks D. D. Brown S. Brunett G. Bruno R. Bruntz J. Bryant A. Buikema T. Bulik H. J. Bulten A. Buonanno R. Buscicchio D. Buskulic R. L. Byer L. Cadonati M. Caesar G. Cagnoli C. Cahillane H. W. Cain, III J. Calderón Bustillo J. LIGO Laboratory California Institute of Technology Pasadena California 91125 USA Louisiana State University Baton Rouge Louisiana 70803 USA Inter-University Centre for Astronomy and Astrophysics Pune 411007 India Dipartimento di Farmacia Università di Salerno I-84084 Fisciano Salerno Italy INFN Sezione di Napoli Complesso Universitario di Monte S.Angelo I-80126 Napoli Italy OzGrav School of Physics and Astronomy Monash University Clayton 3800 Victoria Australia Christopher Newport University Newport News Virginia 23606 USA LIGO Livingston Observatory Livingston Louisiana 70754 USA OzGrav Australian National University Canberra Australian Capital Territory 0200 Australia Max Planck Institute for Gravitational Physics (Albert Einstein Institute) D-30167 Hannover Germany Leibniz Universität Hannover D-30167 Hannover Germany University of Cambridge Cambridge CB2 1TN United Kingdom Theoretisch-Physikalisches Institut Friedrich-Schiller-Universität Jena D-07743 Jena Germany University of Birmingham Birmingham B15 2TT United Kingdom Center for Interdisciplinary Exploration and Research in Astrophysics (CIERA) Northwestern University Evanston Illinois 60208 USA Instituto Nacional de Pesquisas Espaciais 12227-010 São José dos Campos São Paulo Brazil Gravity Exploration Institute Cardiff University Cardiff CF24 3AA United Kingdom Gran Sasso Science Institute (GSSI) I-67100 L’Aquila Italy INFN Laboratori Nazionali del Gran Sasso I-67100 Assergi Italy INFN Sezione di Pisa I-56127 Pisa Italy Università di Pisa I-56127 Pisa Italy International Centre for Theoretical Sciences Tata Institute of Fundamental Research Bengaluru 560089 India Gravitational Wave Science Project National Astronomical Observatory of Japan (NAOJ) Mitaka City Tokyo 181-8588 Japan Advanced Technology Center National Astronomical Observatory of Japan (NAOJ) Mitaka City Tokyo 181-8588 Japan California State University Fullerton Fullerton California 92831 USA NCSA University of Illi

We report on an all-sky search for continuous gravitational waves in the frequency band 20–2000 Hz and with a frequency time derivative in the range of [−1.0,+0.1]×10−8 Hz/s. Such a signal could be produced by a nearby, spinning and slightly nonaxisymmetric isolated neutron star in our Galaxy. This search uses the LIGO data from the first six months of advanced LIGO’s and advanced Virgo’s third observational run, O3. No periodic gravitational wave signals are observed, and 95% confidence-level (C.L.) frequentist upper limits are placed on their strengths. The lowest upper limits on worst-case (linearly polarized) strain amplitude h0 are ∼1.7×10−25 near 200 Hz. For a circularly polarized source (most favorable orientation), the lowest upper limits are ∼6.3×10−26. These strict frequentist upper limits refer to all sky locations and the entire range of frequency derivative values. For a population-averaged ensemble of sky locations and stellar orientations, the lowest 95% C.L. upper limits on the strain amplitude are ∼1.4×10−25. These upper limits improve upon our previously published all-sky results, with the greatest improvement (factor of ∼2) seen at higher frequencies, in part because quantum squeezing has dramatically improved the detector noise level relative to the second observational run, O2. These limits are the most constraining to date over most of the parameter space searched.

关键词： Astrophysical studies of gravity Gravitational wave detection Gravitational wave sources Gravitational waves

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