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power and Energy Conference at Illinois (PECI)

作者： Morcos Metry Sertac Bayhan Robert S. Balog Haitham Abu Rub Qatar Foundation Hamad Bin Khalifa University Doha Qatar Renewable Energy & Advanced Power Electronics Research Laboratory Department of Electrical & Computer Engineering Texas A&M University College Station USA Electrical & Computer Engineering Program Texas A&M University at Qatar Doha Qatar Department of Electronics & Automation Gazi University Ankara Turkey

Dynamic behavior of solar energy resource entails the need of robust controllers that can converge to the maximum power point (MPP) to maximize energy harvest. This paper explores an improved Perturb and Observe (P&O) technique that combines a fixed step model predictive controller (MPC), to speed up the control loop, applied to a boost converter. The proposed MPC Maximum power Point Tracking (MPPT) technique is of higher efficacy and robustness over conventional MPPT. The improved MPC-MPPT is tested for the first time on an MPC strategy of seven-level subMultilevel Inverter (sMI) using three power arms cascaded with the H-bridge inverter. Such topology brings about many sizable benefits such as reduced number of power switches and their gate drivers when compared to the traditional multilevel inverter. MPC is also used as the control strategy for the sMI to eliminate complexities in the space vector pulse width modulation (SVPWM) and overcome the weaknesses of the inner control loop performance.

关键词： Maximum power point trackers Cost function Predictive models Inverters Switches Predictive control

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A new transmission line pilot differential protection principle using virtual impedance of fault component

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Canadian Journal of electrical and computer engineering 2015年第1期38卷 37-44页

作者： Ma, Jing Pei, Xun Ma, Wei Wang, Zengping State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing071003 China Bradley Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University BlacksburgVA24061 United States Fangshan Power Supply Bureau State Grid Beijing Electric Power Grid Beijing100031 China State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Changping Beijing102206 China

A novel line pilot differential protection principle based on the virtual impedance of fault component is proposed in this paper. First, according to the fault component of the measured current and voltage at both line ends, the fault component of the current and voltage at the line midpoint is calculated. Second, the virtual impedance is defined as the calculated voltage fault component divided by the calculated current fault component. And then, according to the two virtual impedances calculated at two line ends, the ratio restraint criterion is formed with the sum of the virtual impedances and the smaller virtual impedance. Finally, by analyzing different characteristics of the criterion in different fault cases, the fault can be identified. Simulation results verify that the proposed method is able to identify different kinds of fault accurately with high sensitivity. It is highly reliable and not affected by the fault location, transition resistance, load current, distributed capacitance, and data synchronization. Even in the case of transitional fault, selectivity can still be guaranteed with the proposed method. © 2003-2010 IEEE.

关键词： Capacitance

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A Generalized Piecewise Quadratic Lyapunov Function Approach to Estimating the Domain of Attraction of a Saturated system

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IFAC-PapersOnLine 2015年第11 11期48卷 120-125页

作者： Li, Yuanlong Lin, Zongli Department of Automation Shanghai Jiao Tong University Key Laboratory of System Control and Information Processing of Ministry of Education Shanghai200240 China Charles L. Brown Department of Electrical and Computer Engineering University of Virginia CharlottesvilleVA22904-4743 United States

This paper revisits the problem of estimating the domain of attraction of a saturated system with an algebraic loop. A piecewise quadratic Lyapunov function of an augmented state vector composing of the system state and the saturated input has been proposed for use in estimating the domain of attraction for a saturated system. Considering the relationship between the system states and the saturation function, we propose in this paper a generalized piecewise quadratic Lyapunov function, which results from adding a term that characterizes the regional sector condition of the saturated input to the piecewise quadratic Lypunov function. The matrix associated with the generalized piecewise quadratic Lyapunov function is not required to be positive definite, and thus a set of less conservative stability conditions are established, from which a larger estimate of the domain of attraction can be obtained. Simulation results indicate that the effectiveness and superiority of the proposed method. © 2015

关键词： Lyapunov functions Domain of attraction Input saturation Piece wise quadratic Lyapunov function Positive definite Saturated systems Saturation function Sector condition Stability condition

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Robust Decentralized Control of Interconnected Nonlinear systems Subject to Uncertainties and Disturbances via Generalized Extended State Observers 34

Robust Decentralized Control of Interconnected Nonlinear Sys...

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第三十四届中国控制会议

作者： ZHANG Chuanlin YANG ning HE Shuaipeng JIA Ruting Shanghai Engineering Research Center of Intelligent Management and Control for Power Process College of Automation EngineeringShanghai University of Electric Power Key Laboratory of Measurement and Control of Complex Systems of Engineering Ministry of Education Southeast University Electrical and Computer Engineering Department California State University

ISBN: (纸本)9789881563897

This paper studies the problem of robust decentralized control for a class of large-scale interconnected systems subject to uncertainties and disturbances via a generalized active disturbance rejection control method. First, a novel extended state observer(ESO) is constructed separately for each subsystem with less dependence of the precise system information and structure. Second, an explicit formula of the decentralized active disturbance rejection control(DADRC) law is presented by utilizing the output feedback domination approach. It is shown that by a delicate analysis procedure, the closed-loop system can be rendered semi-globally asymptotically stable only using decentralized output feedback anti-disturbance controller. Numerical simulations show the efficiency of the proposed method.

关键词： output feedback control global stabilization disturbance rejection control extended state observer

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Smart grid data analysis and prediction modeling

Smart grid data analysis and prediction modeling

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IEEE International Conference on Progress in Informatics and Computing (PIC)

作者： Hang Yang Ping Li Anum Masood Yuning Xiao Bin Sheng Qichen Yu Information Department China Southern Power Grid Guangzhou Guangdong China Department of Mathematics and Information Technology Education University of Hong Kong Hong Kong China Department of Computer Science and Engineering Shanghai Jiao Tong University Shanghai China Department of Computer Science COMSATS Institute of Information Technology WahCantt Pakistan State Key Laboratory of Computer Science Chinese Academy of Sciences Beijing China Department of electrical engineering and automation Shanghai Jiao Tong University Shanghai China

ISBN: (纸本)9781509034857

With the rapid development of power grid, prediction of electric quantity changes has become increasingly important. High-performance power grid systems can improve economic effectiveness and operational efficiency through accurate prediction. This paper proposes a prediction model based on temperature, humidity, time, and the number of people. On account of the standards of support vector machine (SVM) and the HBase platform, we have implemented a forecasting model and designed simulative experiments. The experimental results show that time and variation in the number of people has a remarkable influence on prediction, while temperature and humidity hardly have any effects.

关键词： Humidity Support vector machines Training Temperature power grids Environmental factors Distributed databases

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Thermal Network Parameter Identification of IGBT Module Based on the Cooling Curve of Junction Temperature

Thermal Network Parameter Identification of IGBT Module Base...

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Annual IEEE Applied power Electronics Conference and Exposition

作者： Xiong Du Tengfei Li Jun Zhang Heng-Ming Tai Pengju Sun Luowei Zhou State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Department of Electrical and Computer Engineering at the University of Tulsa

ISBN: (纸本)9781467395519

The thermal network parameters of IGBT module are wildly used for reliability evaluation, lifetime calculation, health monitoring, and predictive maintenance. Commonly used thermal network parameter identification methods include the finite element method (FEM) and the curve fitting of thermal impedance (Zth) method. The former method calculates directly using the IGBT geometric structure and material properties, but it is difficult to consider the aging procedure of IGBT. The curve fitting method mainly depends on constant loss constraints, which is difficult to guarantee in practical application. In this paper, we propose an IGBT thermal network parameter identification method using the measured junction temperature cooling curve in the procedure of converter shutdown. The relationship between the time constants of junction temperature curve and the thermal network parameters is investigated. We show that the RC parameters can be identified in two different cooling conditions. The obtained RC parameters are in good agreement with the results by JESD51-14 method. The proposed method is simple and easy to implement. In particular, it does not need to consider the dissipation loss of IGBT before shutdown, and is suitable for RC thermal parameter quasi-online measurement.

关键词： IGBT module thermal network parameter identification junction temperature cooling curve

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Digital Generator Control Unit for a Variable Frequency Synchronous Generator

Digital Generator Control Unit for a Variable Frequency Sync...

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International Conference on electrical Machines and systems

作者： Jing Li Jiuan Gao Yang Yang Chao Zhang Weilin Li Xiaobin Zhang Department of Electrical Engineering College of Automation Northwestern Polytechnical University Shanxi China Aviation Key Laboratory of Science and Technology on Aerospace Power System Shaanxi Aero Electric Co. Ltd Shaanxi China

ISBN: (纸本)9781467388634

A new generator control unit (GCU) must be designed to work in a wide frequency range in order to obtain better control performance in variable frequency AC power system. Control algorithms make improvements in terms of determining the control parameters and analyze the influence of the controller parameters on system stability, and compensate for the loss of signals generated in the conditioning process. This paper compares the pros and cons of different RMS algorithms and determine the final RMS calculation scheme. Test results show a considerable performance improvement for the proposed design in dynamic performance and adjustment precision.

关键词： Digital control synchronous generator excitation voltage control

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A generalized piecewise quadratic lyapunov function approach to estimating the domain of attraction of a saturated system

A generalized piecewise quadratic lyapunov function approach...

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1st IFAC Conference on Modelling, Identification and Control of Nonlinear systems, MICNON 2015

关键词： Lyapunov functions

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Comprehensive risk assessment method of power planning scheme considering natural disasters

Comprehensive risk assessment method of power planning schem...

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

作者： Hailei He Qinyong Zhou Qi Zuo Jun Zhong Power System Department China Electric Power Research Institute Beijing China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing China Electrical Engineering and Automation School of Electrical Engineering Chongqing University Beijing China

In order to hedge the small-probability high-risk events which power system may face against, it is essential to consider the impact of natural disasters in the power system planning stage. First, this paper establishes the component damage probability model under natural disasters. Second, the system risk assessment based on analytical method is discussed, and the indicators and algorithm for rapid line risk identification are proposed to alleviate the computation burden of the analytical method. Finally, a comprehensive risk assessment method considering natural disaster is proposed based on PSD-BPA transient stability program. The case study performed in the actual systems verifies that the proposed indicators and method are accurate and effective.

关键词： Risk management power system stability Indexes Stability criteria power industry Face power system planning

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Performance Comparison of LVRT Techniques for DFIG Wind Turbine Under Asymmetrical Voltage Sags

Performance Comparison of LVRT Techniques for DFIG Wind Turb...

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IEEE International Conference on power Electronics and Drive systems

作者： Aimeng Wang Wenyuan Xi Yazan Alsmadi State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Electrical and Computer Engineering Department The Ohio State University

ISBN: (纸本)9781479944019

The low voltage ride through (LVRT) requirements are usually defined by the grid codes at the point of common coupling (PCC). The voltage dip types experienced at the doubly - fed induction generator (DFIG) terminals are different from the conditions at the PCC due to the characteristics and limitations of the network. This paper first analyzes the fault characteristics experienced at the terminal of the wind turbine. Second, the performance of the crowbar circuit under severe asymmetrical grid faults are analyzed. Meanwhile, the operation behaviors of several LVRT control strategies under mild asymmetrical grid faults are given by simulation with the Matlab/Simulink. Then the performance of the approach by using stator damping resistor (SDR) are further analyzed based on the simulation results. This paper aims to give help on choosing or redesign reasonable LVRT control strategies under asymmetrical grid faults.

关键词： Doubly-fed induction generator (DFIG) Low voltage ride through (LVRT) Crowbar Asymmetric grid fault

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