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2nd International Conference on Artificial Intelligence and engineering Applications(AIEA 2017)

作者： JIAWEI XING NENG JIN XIANQING HU XIANGNING LIN XIONGHUI HAN State Key Laboratory of Advanced Electromagnetic Engineering and Technology (Huazhong University of Science and Technology) Electric Engineering & Renewable Energy School China Three Gorges University Meizhou Power Supply Bureau

The electronic transformer is the most important data collecting unit within substation,and the reliability of its output signal concerns the realization of substation protection and control *** view of the similarity of power system signal,this paper proposes a novel strategy based on wavelet algorithm and WVD time-frequency distribution to identify the real-time fault signal of the electronic *** results show that this strategy could effectively identify the fault transformer and guarantee the data accuracy of intelligent application in substation.

关键词： Electronic transformer fault identification wavelet algorithm WVD distribution

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Adaptive control for MMC-SAPF with balanced and unbalanced PCC voltage

Adaptive control for MMC-SAPF with balanced and unbalanced P...

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Annual Conference of Industrial Electronics Society

作者： Chengjing Li Ke Dai Derong Lin Chen Xu Ziwei Dai State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Department of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute Troy NY USA

Three-phase three-wire shunt active power filter (SAPF) with traditional positive-sequence control can only compensate part of the nonlinear load current harmonics if the PCC voltage changes from balanced to unbalanced condition. Changes of both nonlinear load current harmonic components and equivalent circuit for modular multilevel converter based SAPF (MMC-SAPF) are analyzed in the paper. To solve the problems caused by PCC voltage switches between balanced and unbalanced conditions while MMC-SAPF operating, an adaptive control strategy for MMC-SAPF including the voltage unbalance detection and smoothly switching control on enabling/disabling the negative-sequence strategy is proposed. Simulation and experimental tests validate the effectiveness of the proposed control scheme on a downscaled 64V/2kVA apparatus.

关键词： Harmonic analysis Radio frequency Voltage control Power harmonic filters Equivalent circuits Control systems

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Optimal sizing of the hybrid energy storage system aiming at improving the penetration of wind power

Optimal sizing of the hybrid energy storage system aiming at...

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2016 IEEE PES Asia Pacific Power and Energy engineering Conference, APPEEC 2016

作者： Tianmeng, Yang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781509054183

Wind power has the inherent characteristics of random fluctuation and intermittence, which bring adverse effects to system's steady operation and security, and restrict the penetration of wind power to integrate to the power grid. Based on the analysis of different kinds of energy storage system, a hybrid energy storage system (HESS) composed of super capacitor (SC), battery energy storage system (BESS) and pumped storage power station and its optimal sizing method are presented to inhibit the adverse effects of wind power on power grid. BESS and SC are used to mitigate the wind fluctuation, and pumped storage power station is used for peak regulation. Taking the investment and operation costs into consideration, the optimal capacities of HESS can be determined. Based on the modified IEEE RTS-96 system and the actual power output of wind farm, the proposed method is verified. The results prove the effectiveness of the proposed method and it can improve the penetration of wind power with the power system operating the most economically. © 2016 IEEE.

关键词： Investments

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Improved extreme-scenario extraction method for the economic dispatch of active distribution networks

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The Journal of engineering 2017年第13期2017卷 1560-1564页

作者： Yipu Zhang Xiaomeng Ai Jiakun Fang Jinyu Wen State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 Hubei Province People's Republic of China Department of Energy Technology Aalborg University Aalborg DK-9220 Denmark

Optimisation techniques with good characterisation of the uncertainties in modern power system enable the system operators well trade-off between security and sustainability. This study proposes the extreme-scenario extraction-based robust optimisation method for the economic dispatch of active distribution network with renewables. The extreme scenarios are selected from the historical data using the improved minimum volume enclosing ellipsoid (MVEE) algorithm to guarantee the security of system operation while avoid frequently switching the transformer tap. It is theoretically proved that if the decision can be adaptive to the selected extreme scenarios, it can be robust to all the possible scenarios. Simulation results demonstrate that the proposed improved MVEE algorithm significantly reduces the number of scenarios, so that the computational burden is dramatically cut down. Additionally, compared to the existing robust optimisation approach, the proposed method is less conservative for the smaller size of the uncertainty set.

关键词： stochastic programming power distribution economics modern power system robust optimisation method economic dispatch active distribution network improved minimum volume enclosing ellipsoid algorithm system operation selected extreme scenarios improved MVEE algorithm extreme-scenario extraction method optimisation techniques robust optimisation approach

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The optimal capacity determination method of energy storage system with different applications in wind farm

The optimal capacity determination method of energy storage ...

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2016 IEEE PES Asia Pacific Power and Energy engineering Conference, APPEEC 2016

作者： Tianmeng, Yang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781509054183

The intermittence and variability of wind power generation present sustainable challenges for power system's dispatch and steady operation. In the future it may be a main way to install energy storage system (ESS) in the wind farm for integrating high penetration of wind power. And considering about the feasibility and economy, three applications of the ESS are analyzed in this paper, including the mitigation of wind power fluctuations, reduction of the system reserve capacity requirements, and receiving more profits by charging and discharging flexibly based on the peak-valley time of use electricity price. Based on the upper fluctuation rate limit, the grid-connected wind farm power output is determined, and the ESS capacity can be determined based on the frequency spectrum analysis of wind farm power output. Finally, by analyzing the history data of some actual wind farm, the optimal capacities of ESS is determined, and the simulation results prove the effectiveness and efficiency of the proposed method in this paper. © 2016 IEEE.

关键词： Digital storage

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DC Emergency Power Control Strategy for AC/DC Multi-Channel Interconnected System

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Energy and Power engineering 2017年第4期9卷 735-747页

作者： Yicong Wang Dejun Shao Zhiqiang Zhang Youping Xu Xiaojie Pan Haishun Sun State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Central China Branch of State Grid Corporation of China Wuhan China China Electric Power Research Institute Beijing China

Inter-regional transmission line fault often results in power flow transferring, tie-line overloading and system islanding. Traditional control methods such asgenerator tripping and load shedding are costly, and also have undesirable impacts on theloadside. In this paper, a new emergency power control strategy is proposed for multi-channel interconnected system by using the overload capacity of non-fault DC lines. First of all, the capacity of emergency power control can be acquired by critical transmission power of a certain tie-line for stability. Secondly, the shortest electric distance can be calculated by Dijkstra algorithm, and then the priority of emergency control of the DC lines can be obtained by the entropy weight method. When the inter-regional transmission power decreases and the effect of single DC line emergency control is poor, the multi-channel cooperative emergency control strategy is proposed to ensure the system stability. Simulation results verify the effectiveness of the method proposed.

关键词： DC Emergency Control Critical Stable Transmission Power Dijkstra Algorithm Entropy Weight Multi-Channel Cooperated Emergency Control

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Review on power generation and bidding optimization of virtual power plant

Review on power generation and bidding optimization of virtu...

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International Conference on Electrical engineering and Informatics (ICELTICs)

作者： Mengxuan Lv Suhua Lou Baolin Liu Zhen Fan Zhiming Wu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Yunnan Electric Power Co. Ltd. Kunming China

As an important class of structure in future power system, virtual power plant (VPP) integrates diversified distributed energy resources (DER). Through the optimal dispatch, on one hand, VPP optimizes its internal resources and on the other hand, it participates in the operation and trade of power system as a whole. This paper makes a comprehensive review on optimal dispatch of VPP starting with the concept and composition of VPP and the operation modes are studied and concluded. Then the bi-level structure and main modes of optimal dispatch of VPP are analyzed and the optimal bidding strategy of VPP is explored. The general expressions of optimization models for VPP participating in the operation and trade of electricity markets are given respectively by summarizing operating costs of VPP. Finally, some directions are given for further studies of VPP.

关键词： Energy storage Electricity supply industry Optimization Power generation Power systems Generators Load modeling

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Constant maximum power control for dynamic wireless power transmission system

Constant maximum power control for dynamic wireless power tr...

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IEEE PELS Workshop on Emerging Technologies: Wireless Power (WoW)

作者： Hongsheng Hu Tao Cai Shanxu Duan Hao Feng Xiaoming Zhang Jintao Niu Jinbo Zhao State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Laboratory of Low-frequency Electro-magnetic Communication Technology Wuhan Maritime Communication Research Institute Wuhan China

ISBN: (纸本)9781509062591

Dynamic Wireless Power Transmission (DWPT) uninterruptedly charges the moving Electric Vehicles (EVs) through the powered roadway, providing a potential solution to the battery bottleneck. EVs need to obtain energy as much as possible to guarantee proper functioning. Meanwhile, it is necessary to fully utilize the powered roadway in order to economize energy and reduce paving cost. Based on the selected sectional track and detuned series-series (SS) topology, a Constant Maximum Power Point Tracking (CMPPT) control method in the secondary side without the real-time communication between primary and secondary sides is proposed. This method uses the perturbation of rectified DC voltage and tracks the maximum power point. Thus the DWPT system transfers constant and maximum power regardless of the varied magnetic coupling coefficient. A scale-down DWPT demonstration platform based on sectional track is built. The experimental results demonstrate the validity and feasibility of proposed control method for EVs where nearly constant and maximum power is received even when the coupling coefficient varies from 0.13 to 0.28.

关键词： Couplings Coils Topology Batteries Voltage control Wireless power transmission Transmitters

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Resilient Wide-Area Damping Control for Interarea Oscillation Considering Communication Failure

Resilient Wide-Area Damping Control for Interarea Oscillatio...

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IEEE Power and Energy Society General Meeting

作者： Yu Shen Wei Yao Jinyu Wen Haibo He Cheng Luo State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science & Technology Department of Electrical Computer and Biomedical Engineering University of Rhode Island Northern Indiana Public Service Company (NIPSCO)

ISBN: (纸本)9781538622131;9781538622124

The wide-area damping controller, which uses the wide-area signal transmitted by communication network as the input signal, is an effective measure to suppress interarea oscillations. However, communication failure may occur when communication device fault, disaster or even attack occur. It would lead to the loss of wide-area signal and may disable the wide-area damping controller (WADC). To address this problem, this paper proposes a resilient WADC by employing both a wide-area signal and a local signal as the input signals to combine the observability and reliability of input signals. Moreover, a goal representation heuristic dynamic programming (GrHDP) algorithm is employed to design the resilient WADC of voltage source converter high voltage direct current (VSC-HVDC) transmission system for interarea oscillation. The proposed resilient GrHDP-WADC has the ability of online learning and strong adaptivity to handle the communication failure. Meanwhile, it does not need the exact model of the power system. Case study is undertaken based on a 10-machine 39-bus system with one VSC-HVDC transmission line. Simulation results show that the proposed resilient GrHDP-WADC can maintain a good control performance under communication failure.

关键词： Oscillators Power transmission lines Damping Power conversion Mathematical model Neural networks

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Research and design of permanent magnetic synchronous motor drives used for hydraulic press 19

Research and design of permanent magnetic synchronous motor ...

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19th International Conference on Electrical Machines and Systems, ICEMS 2016

作者： Dezhang, Lou Kai, Yang Yuan, Zhu Xiaoguang, Wang Cheng, Luo State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9784886860989

Aiming at permanent magnetic synchronous motor(PMSM)drives used for hydraulic press, this paper presented the design method and implementation of PMSM drives based on field oriented control(FOC) and closed-loop pressure control. There were three feedback signals - current, speed and pressure in the control system, obtained from a current sensor, a resolver and a pressure sensor. Then based on this, the three closed-loop control strategy of the pressure loop, the speed loop and the current loop was adopted. Furthermore, the design of the hardware and the software was presented in detail. The simulation and the experiments results show that the proposed control system is available, reasonable and the PMSM drives has an excellent performance. © 2016 The Institute of Electrical Engineers of Japan.

关键词： Vector control (Electric machinery)

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