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IEEE Power and Energy Society General Meeting

作者： Meiqing Zhang Xiaoming Yuan Jiabing Hu Shuo Wang Shicong Ma Qing He Jun Yi State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Sci. and Tech. Power System Department China Electric Power Research Institute

ISBN: (纸本)9781467380416

This paper investigates the control design when a wind power base of doubly fed induction generators (DFIGs) is directly connected to line-commutated converter (LCC) HVDC link. Firstly, the positive feedback characteristic of PLL in DFIG is analyzed, which allows DFIG to self-maintain frequency without an available grid voltage reference. Furthermore, in order to avoid the rapid variation of HVDC power flow when some disturbances happened to the local system, it is proposed that the local inertial and primary frequency supports are provided by wind turbines, and the LCC-HVDC link is only responsible for transmitting wind power to the main grid. The dynamic performances of an aggregated DFIG in island operation, and operating with HVDC are demonstrated by the simulation results. Satisfactory responses verify the feasibility and effectiveness of the proposed control strategy.

关键词： Doubly fed induction generator (DFIG) High voltage dc (HVDC) transmission Inertia support Primary frequency control Wind power transmission Frequency control Wind Energy Conversion Systems Wind energy High-voltage direct current (HVDC) power transmission island operation HVDC transmission line design control gate voltage control strategy Inertial local system Prolymphocytic Leukemia Phase locked loops line-commutated converter

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A Novel Method for Rigorously Analyzing Beam Loading Effect Based on the Macro-Particle Model

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Chinese Physics Letters 2014年第1期31卷 65-68页

作者：陈曲珊裴元吉胡桐宁秦斌 State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 National Synchrotron Radiation Laboratory University of Science and Technology of China Hefei 230026

The beam loading effect is a considerable issue for a high average current beam. We apply a novel method without utilizing the specious beam current value to rigorously analyze the beam loading effect in S-band linacs. By tracking every macro-particle＇s state and using the energy conservation law, power dissipated from the beam is calculated in each cell. In the new particle-based algorithm, the concept of equivalent beam current is proposed. Its value is not constant and it has a small variation through the accelerating structure. Also, we introduce the iteration algorithm as comparison and we find that the two algorithms coincide with each other very well.

关键词： ENERGY conservation BEAM dynamics PARTICLE beams PARTICLE methods (Numerical analysis) NUMERICAL analysis MATERIAL point method

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Transmission Network Expansion Planning Considering Uncertainties in Loads and Renewable Energy Resources

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CSEE Journal of Power and Energy Systems 2015年第1期1卷 78-85页

作者： Jinyu Wen Xingning Han Jiaming Li Yan Chen Haiqiong Yi Chang Lu State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan430074China China South Power Grid International Co. LTDGuangzhou510080China State Power Economic Research Institute Beijing102209China

This paper proposes a novel method for transmission network expansion planning(TNEP)that take into account uncertainties in loads and renewable energy *** goal of TNEP is to minimize the expansion cost of candidate lines without any load curtailment.A robust linear optimization algorithm is adopted to minimize the load curtailment with uncertainties considered under feasible expansion ***,the optimal planning scheme obtained through an iterative process would be to serve loads and provide a sufficient margin for renewable energy *** this paper,two uncertainty budget parameters are introduced in the optimization process to limit the considered variation ranges for both the load and the renewable *** results obtained from two test systems indicate that the uncertainty budget parameters used to describe uncertainties are essential to arrive at a compromise for the robustness and optimality,and hence,offer a range of preferences to power system planners and decision makers.

关键词： Expansion planning renewable generation robust linear optimization transmission network uncertainty

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Beam dynamics simulations of the injector for a compact THz source

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Chinese Physics C 2014年第8期38卷 103-110页

作者：李骥裴元吉尚雷冯光耀胡桐宁陈曲珊李成龙 National Synchrotron Radiation Laboratory University of Science and Technology of China Deutsches Elektronen-Synchrotron State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology

Terahertz radiation has broad application prospects due to its ability to penetrate deep into many organic materials without the damage caused by ionizing radiations. A free electron laser （FEL）-based THz source is the best choice to produce high-power radiation. In this paper, a 14 MeV injector is introduced for generating high-quality beam for FEL, is composed of an EC-ITC RF gun, compensating coils and a travelling-wave structure. Beam dynamics simulations have been done with ASTRA code to verify the design and to optimize parameters. Simulations of the operating mode at 6 MeV have also been executed.

关键词： EC-ITC RF gun compensating coils travelling-wave structure start-to-end simulation

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An investigation of the persistence property of wind power time series

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Science China(Technological Sciences) 2014年第8期57卷 1578-1587页

作者： SUN HaiShun LI JiaMing LI JingHua Wu Tong WEN JinYu XIE HaiLian YUE ChengYan China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologySchool of Electrical and Electronic Engineering ABB (China) Ltd. Corporate Research Center

Mining the inherent persistence property of the time series of wind power is crucial for forecasting and controlling wind *** common methods exist that can fully depict and quantify the persistence *** on the definition of the active power output state of a wind farm,this paper describes the statistical persistence property of the duration time and state *** on the results of our analysis of significant amounts of wind power field measurements,it is found that the duration time of wind power conforms to an inverse Gaussian ***,the state transition matrix of wind power is discovered to yield a ridge property,the gradient of which is related to the time scale of interest.A systemaic methodology is proposed accordingly,allowing the statistical characteristics of the wind power series to be represented appropriately.

关键词： characteristics analysis persistence property duration time state transition wind power series

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Rotor dynamics of DFIG wind turbines under grid faults

Rotor dynamics of DFIG wind turbines under grid faults

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International Conference on Renewable Power Generation (RPG 2015)

作者： Chao Ye Jie Ying Jiabing Hu Yajing Wang Ningbo Wang State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Eelectronic Engineering Huazhong University of Science and Technology Wuhan 430074 China Wind Power Technology Center of Gansu Electric Power Corporation Lanzhou 730050 China

ISBN: (纸本)9781510821415

With the increasing wind power penetration, the electromechanical transient stability of wind turbines is more and more significant. Deep research of rotor dynamics of wind turbines is fundamental to the stability analysis during grid faults. This paper concentrates on the rotor motion of doubly-fed induction generator (DFIG) wind turbines (WTs) during a symmetrical grid fault. Various factors having influence on input or/and output powers are considered under the existing transient power control strategy. The objective of this paper is to provide an insight into the rotor dynamic behaviour of DFIG WTs during grid faults.

关键词： DFIG electromechanical transient process rotor dynamics transient stability wind turbine

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Research on the security risk assessment system for regional complex power grid

Research on the security risk assessment system for regional...

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International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT)

作者： Faqi Yan Yang Wang Xianggen Yin Jinhui Li Wen Yang Biao Xu Cheng Jian Central China Electric Power Dispatching and Control Sub-center of State Grid Wuhan Hubei Province China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

In order to guarantee the safe and stable operation of the complex power grid and prevent wide-area blackouts, safety and risk assessment of power grid, which is carried out by charge of the third party independent evaluation agency, is an important means of safety risk management and conducive to satisfy the respective requirements and interests of government, power enterprise and power user. Besides, it will promote the progress of deregulation of power grid under the present electric power system. Considering the current situation of regional power grids of China and the requirement of power grid security risk control, this paper introduces the framework and methods of safety and risk assessment for large power grid and analyzes one case of the application in a trans-provincial regional power grid of China.

关键词： Decision support systems Power industry Risk management Power systems Radio frequency

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Numerical Simulation on the Production Mechanism of Surface-Wave Plasmas Sustained along a Metal Rod

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Chinese Physics Letters 2014年第3期31卷 103-106页

作者： ZHU Long-Ji CHEN Zhao-Quan YIN Zhi-Xiang WANG Guo-Dong XIA Guang-Qing HU Ye-Lin ZHENG Xiao-Liang ZHOU Meng-Ran CHEN Ming LIU Ming-Hai College of Electrical and Information Engineering Anhui University of Science and Technology Huainan 232001 State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology Dalian 116024

For interpreting the production mechanism of surface-wave plasmas sustained along a metal rod, electromagnetic simulation on the electromagnetic field distributions and particle-in-cell/Monte Carlo collision （PIC/MCC） simulation of the ionization process are present. The results show that the enhanced electric field of surface plasmon polaritons （SPPs） can be excited in the ion sheath layer between the negative-voltage metal rod and the surface-wave plasmas, which is responsible for maintaining the plasma discharge. Moreover, the spatio-temporal evolutions of plasma density and electric fields are simulated by the PIC/MCC model. It is further suggested that the expanded ion sheath layer can extend the length of plasma domain by increasing the plasma absorbed energy from SPPs.

关键词： SURFACE waves (Fluids) RESEARCH PLASMA (Ionized gases) -- Research ELECTROMAGNETISM electromagnetic theory PHYSICS research

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Coordinated strategy between positive- and negative-sequence currents of wind farms for transient stability enhancement of synchronous generators under asymmetrical grid faults

Coordinated strategy between positive- and negative-sequence...

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International Conference on Renewable Power Generation (RPG 2015)

作者： Longfei Wang Wei He Jiabing Hu Ningbo Wang State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China Wind Power Technology Center of Gansu Electric Power Corporation Lanzhou 730050 China

ISBN: (纸本)9781510821415

As the penetration of wind power is growing, it is demanded that wind farms should contribute to maintaining power system stability, for particularly under various grid fault conditions. Highly-penetrated wind farms are able to influence synchronous generators' (SGs') behaviour for transient stability enhancing by injecting the designed positive- and negative-sequence currents, especially when the electric distance between wind farms and SGs is short. In this paper, SG's transient stability during asymmetrical grid faults is the centre of interest. The relationships between SG's rotor swing function and wind turbines injecting currents are analysed based on the mathematical models of unbalanced power system. Coordinated requirements for positive- and negative-currents injection of wind turbines, for the purposes of to enhance transient stability, are proposed during asymmetrical faults. Time domain simulation validates the result.

关键词： Asymmetrical Grid Faults Negative Sequence Currents Positive Sequence Currents Transient Stability Wind Farms

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Distribution network energy loss calculation method considering wind power integration

Distribution network energy loss calculation method consider...

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International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT)

作者： Jiasi Wu Mei Li Bu-han Zhang Bo Ruan Dehua Yu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology WUHAN CHINA State Grid Hubei Economic Research Institute WUHAN CHINA State Grid Hubei Electric Power Company WUHAN CHINA

Grid energy loss is one of the key factors affecting the economic operation of power systems. Accurate calculation of electric energy consumption, will have a great positive effect on the planning, operation and management of all aspects of the grid. Due to the randomness of wind power resources, wind power is likely to increase access or may reduce power system losses. Therefore, study on grid energy loss calculation method containing wind integration has very important practical significance. Currently there are many grid theoretical line loss calculation method, but these methods have some limitation such as, less considering the load curve changes. This paper presents an improved method of equivalent power to calculate energy loss of wind power integration, through considering the impact of the load curve, and the random fluctuations of wind power, making use of load shape coefficient to correct the average power, computing power flow calculation by using equivalent power, calculate the energy loss more accurately.

关键词： Wind power generation Energy loss Loss measurement Shape Wind farms Reactive power

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