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IEEE Power and Energy Society General Meeting

作者： Xin Sun Jinfu Chen Qiaomu Zhu Dongyuan Shi Yinhong Li Xianzhong Duan State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9781509041695

Transmission reliability margin (TRM) is the amount of transmission capability ensuring that the transmission network is secure from the uncertainty in system operating condition. The accurate evaluation of TRM is of great importance in the calculation of available transfer capability (ATC). This paper presents a fast assessment method of TRM using stochastic response surface method (SRSM). The statistics and probability distributions of TRM can be accurately estimated with less computational cost. The effectiveness of the proposed method is demonstrated by several case studies of the modified IEEE 30-bus standard test systems with wind farm integration.

关键词： Transmission line measurements Standards Transient analysis

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Microgrid economic operation considering plug-in hybrid electric vehicles integration

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Journal of Modern Power Systems and Clean Energy 2015年第2期3卷 221-231页

作者： Changsong CHEN Shanxu DUAN State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074China

In this paper,the microgrid economic scheduling mathematical model considering the integration of plug-in hybrid electric vehicles(PHEVs)is presented and the influence of different charging and discharging modes on microgrid economic operation is *** generic algorithm is used to find an economically optimal solution for the microgrid and PHEV *** scheduling of PHEVs and the microgrid are optimized to reduce daily electricity cost and the potential benefits of controlled charging/discharging are explored *** caused by vehicle utilization as well as technical limitations of distributed generation and energy storage system are taken into *** proposed economic scheduling is evaluated through a simulation by using a typical grid-connected microgrid model.

关键词： Plug-in hybrid electric vehicle(PHEV) Economic scheduling Smart charging and discharging Microgrid(MG)

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Non-dominant poles placement of LCL-type grid-connected converter for harmonic suppression under minimized delay

Non-dominant poles placement of LCL-type grid-connected conv...

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IEEE International Conference on Industrial technology (ICIT)

作者： Ji Lei Jian Xiong Zhiqiang Wan Chen Chen Wanxun Liu Weibiao Wu Zenghui Kong State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan Hubei China

ISBN: (纸本)9781467380768

With the application of digital control, the problem of one-step-delay appears. It limits the achievable control bandwidth. Compared with one-step-delay, minimized delay can achieve superior performance. However, it leads to the low-frequency aliasing phenomenon because sampling is not happened in the middle of either the turn-on or the turn-off times of IGBT. To weaken the influence of aliasing and reduce the total harmonics distortion (THD) of output current, the strategy of reducing the inductor current feedback coefficient by adjusting non-dominant poles is proposed. Simulation and experimental results are provided to verify the feasibility and effectiveness of the scheme.

关键词： Delays Power harmonic filters Harmonic analysis Active filters Inductors Damping Voltage control

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Analysis of common mode circuit of BDFG-based ship shaft power generation system

Analysis of common mode circuit of BDFG-based ship shaft pow...

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IEEE Energy Conversion Congress and Exposition

作者： Hongbin Yang Hua Lin Xingwei Wang Guangzhi Yao State key laboratory of advanced electromagnetic engineering and technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9781509007387

In brushless doubly-fed generator (BDFG)-based ship shaft power generation system, the two back-to-back converters bring two common mode voltage sources and BDFG's two sets of stator windings provide several common mode current branches, which make the common mode circuit complicated. This paper have listed the common mode current loops and proposed an equivalent common mode circuit model based on lumped parameters for the system. The common mode impedances of the system have been acquired by measuring and calculating. The common mode current loop consists of two sets of stator windings and two back-to-back converters has been discussed with emphases. Simulation and experimental results agree with each other well and they verify the validity of the proposed model and the analysis about common mode circuit.

关键词： common mode circuit model BDFG common mode current loops

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Revoking amplitude and oscillation deaths by low-pass filter in coupled oscillators

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Physical Review E 2017年第6期95卷 062206-062206页

作者： Wei Zou Meng Zhan Jürgen Kurths Department of Physics Hong Kong Baptist University Kowloon Tong Hong Kong SAR People's Republic of China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 People's Republic of China Potsdam Institute for Climate Impact Research Telegraphenberg Potsdam D-14415 Germany Institute of Physics Humboldt University Berlin Berlin D-12489 Germany Department of Control Theory Nizhny Novgorod State University Gagarin Avenue 23 606950 Nizhny Novgorod Russia

When in an ensemble of oscillatory units the interaction occurs through a diffusion-like manner, the intrinsic oscillations can be quenched through two structurally different scenarios: amplitude death (AD) and oscillation death (OD). Unveiling the underlying principles of stable rhythmic activity against AD and OD is a challenging issue of substantial practical significance. Here, by developing a low-pass filter (LPF) to track the output signals of the local system in the coupling, we show that it can revoke both AD and OD, and even the AD to OD transition, thereby giving rise to oscillations in coupled nonlinear oscillators under diverse death scenarios. The effectiveness of the local LPF is proven to be valid in an arbitrary network of coupled oscillators with distributed propagation delays. The constructive role of the local LPF in revoking deaths provides a potential dynamic mechanism of sustaining a reliable rhythmicity in real-world systems.

关键词： Coupled oscillators

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Analysis of Voltage Control Interactions and Dynamic Voltage Stability in Multiple Wind Farms

Analysis of Voltage Control Interactions and Dynamic Voltage...

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IEEE Power and Energy Society General Meeting

作者： Yunzhe Qian Xiaoming Yuan Mingquan Zhao State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Sci. and Tech.

ISBN: (纸本)9781509041695

Voltage controls in multiple wind farms which are located closely interact with each other due to the electrical connection. This paper poposes a small-signal model to reveal the mechanism of voltage control interactions. The significant influences of the interactions on dynamic voltage stability are carefully discussed. Negative damping component caused by interactions deteriorate dynamic voltage stability under weak grid conditions. The analysis shows that two factors, grid strength and control parameters, have great influence on the interactions. The system stability can be threatened when large-scale wind farms integrate into a weak grid and control parameters is set unproper for the system operation. Finally, time domain simulation results are presented to validate the phenomenon and the effects of the two facors.

关键词： Interactions Voltage control Dynamic voltage stability Weak grid Wind farm Wind farms Voltage stability Voltage regulation control parameter Operating systems System stability

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A Corrective Control Approach Considering Load Fluctuation of the Power System

A Corrective Control Approach Considering Load Fluctuation o...

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2016 International Conference on Electrical engineering and Automation（ICEEA2016）

作者： Guo-jun LU Hang LI Wei-si DENG Pei BIE Bu-han ZHANG Zhe ZHANG Guo-yan CHEN Guangzhou Power Supply Co. Ltd State Key Laboratory of Advanced Electromagnetic Engineering and Technology

When power system operates in an insecure condition, corrective control measures should be takin in time to eliminate constrains violation. Few of current corrective control approaches take load fluctuation into consideration, which may result in invalid measures. The present paper proposes a novel corrective control approach which takes load fluctuation into consideration. Firstly, the probability distribution of state variables and sensitivity coefficient matrixes are obtained by probabilistic power flow. Then a corrective control model considering worst situation of branch power and bus voltage amplitude is proposed. Case study shows that the approach is valid and effective.

关键词： Corrective control Probabilistic power flow Sensitivity method

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Centralized control of parallel connected power conditioning system in electric vehicle charge-discharge and storage integration station

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Journal of Modern Power Systems and Clean Energy 2015年第2期3卷 269-276页

作者： Jiuqing CAI Changsong CHEN Peng LIU Shanxu DUAN State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhanChina

This study presents a centralized control scheme that coordinates parallel operations of power conditioning system(PCS)for the grid interactions of electric vehicles(EVs)in EV charge-discharge and storage integration *** issues for the control and operation of PCS under various operation modes are discussed,including vehicle to grid(V2G)mode,stand-alone mode and seamless transfer *** intelligent multi-mode charge-discharge method is utilized for the V2G mode,and the parallel control method based on communication network is adopted for the standalone *** addition,a novel seamless transfer strategy is proposed,which is able to implement PCS transition between V2G mode and stand-alone *** detailed process of the seamless transfer between the two modes is *** results are presented to show the performance and feasibility of this strategy.

关键词： Centralized control Power conditioning system(PCS) Charge-discharge and storage integration station Vehicle to grid(V2G) Seamless transfer

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A Langmuir probe system for the test setup of an RF-driven negative hydrogen ion source at HUST

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AIP Conference Proceedings 2017年第1期1869卷

作者： P. Zhao D. Z. Chen D. Li C. Zuo 1State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 Hubei China

A test setup of an RF-driven negative hydrogen ion source is being constructed at HUST. It is operated at the typical pressure of 0.3 Pa, maximum RF power of 20 kW/1 MHz, with discharge pulse of 6–10 seconds. In order to diagnose the plasma parameters and evaluate the source performance, a highly integrated and automated Langmuir probe system has been developed in-house. It allows for multiple sweeping, mass data acquisition and automatic data evaluation in a fast diagnosis shot of several hundred milliseconds. Various analysis methods are investigated and compared for the ion density determination. Due to the low density and thick sheath in the plasma, OML theory is selected as the applicable one. Preliminary discharge and diagnosis experiments have been carried out in the experimental source. The plasma in the driver exhibits non-Maxwellian electron energy distribution with low density of 1017 m−3 and electron temperature of 59 eV at 20 kW/0.3 Pa.

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DC bus current analysis considering AC current ripple in three-phase voltage source converters

DC bus current analysis considering AC current ripple in thr...

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European Conference on Power Electronics and Applications

作者： Dong Jiang Qiao Li State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan Hubei Province China

ISBN: (纸本)9781509014101

DC current is an important parameter for the three-phase voltage source converter (VSC). It determines the thermal and reliability status of DC-link capacitor or battery. Analysis and prediction of DC current is associated with three-phase AC current and its ripple, together with the pulse-width-modulation (PWM) method. Based on the AC current ripple prediction method, this paper gives a general DC bus current prediction method with consideration of the AC current ripple. Comparison with simulation results shows the benefits of the method for DC bus current prediction. Experimental results are also provided to validate the prediction result. The predicted DC current ripple can match well with the experimental result.

关键词： Switches Pulse width modulation Power conversion Simulation Predictive models

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