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International Conference on power system Technology (powerCON)

作者： Yichao Zhu Chongra Liu Qinghua Si Gengyin Li State Key Lab. for Alternate Electrical Power System with Renewable Energy Source North China Electric Power University Beijing China Platform Development for Stability Control Station Divison NARI Technology Development Limited Company Nanjing China

A numerical model of fault calculation for AC-DC interconnected system under asymmetrical fault is proposed. It involves two converter models that work effectively under asymmetrical fault. Firstly the article establishes a converter model that based on switching function. In which HVDC system is substituted as sequence impedance in the AC system. The article proposes another converter model that based on the power factor of converter. In which HVDC system can be substituted as power source in the AC system. By simplifying the dynamic characteristics of the control system of HVDC, the numerical model of control system is proposed, and the circuit model of HVDC system is established. Iterative algorithm is used to solve the fault system. The simulation results and calculation results are compared under several fault conditions, and the applicability of the model and switch function is discussed. Some further researches are carried out based on the numerical model.

关键词： Switches Mathematical model Firing HVDC transmission Numerical models Harmonic analysis

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Neutral point voltage balancing method and the influence of some parameters on capacitor voltage in three-level NPC converter

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International Conference on Advanced Engineering Theory and Applications 2013, AETA 2013

作者： Nam, Vo Xuan Giau, Le Van Manh Nho, Nguyen Van Trang, Tran Thanh Electronics Engineering Department Cao Thang College of Technology Ho Chi Minh City Viet Nam National Key Lab. of Digital Control and System Engineering University of Technology Vietnam National University Ho Chi Minh City Viet Nam Power Engineering Research Lab. University of Technology Vietnam National University Ho Chi Minh City Viet Nam Electrical Engineering Department Ho Chi Minh City Open University Viet Nam Electronics and Telecommunication Engineering Department Van Hien University Ho Chi Minh City Viet Nam

ISBN: (纸本)9783642419676

This paper presented a control method for balancing capacitor voltage of three-level neutral-point-diode-clamped (NPC) converter. This control method overcomes one of the main problems of this converter, which is the low frequency voltage oscillation that appears in the neutral point. The algorithm is based on Carrier-based Pulse Width Modulation (CPWM). This paper showed the influence of power factor, modulation index and offset limit on capacitor voltage. It also presented the optimal amplitude of offset voltage in some case of power factors and modulation indexes. © Springer-Verlag Berlin Heidelberg 2014.

关键词： Modulation

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Improved pitch angle control for variable-speed wind turbine system

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International Conference on Advanced Engineering Theory and Applications 2013, AETA 2013

作者： Van, Tan Luong Nguyen, Buu Pham Nhat Tan Truong, Trung Hieu Trang, Tran Thanh Department of Electrical Engineering Ho Chi Minh City Electric Power College 554 Ha Huy Giap District 12 Ho Chi Minh City Viet Nam Department of Power System Ho Chi Minh City Electric Power College 554 Ha Huy Giap District 12 Ho Chi Minh City Viet Nam Department of Electrical-Mechanical Engineering Ho Chi Minh City Electric Power College 554 Ha Huy Giap District 12 Ho Chi Minh City Viet Nam Department of Electronics and Telecommunication Engineering Van Hien University 665-667-669 Dien Bien Phu District 3 Ho Chi Minh City Viet Nam National Key Lab. of Digital Control and System Engineering University of Technology Vietnam National University Ho Chi Minh City 268 Ly Thuong Kiet District 10 Ho Chi Minh City Viet Nam

ISBN: (纸本)9783642419676

In this paper, a pitch angle control scheme based on the fuzzy logic is proposed for the variable-speed wind turbine systems. The generator output power and rotor speed are used as control input variables for the fuzzy logic controller (FLC), which are effective to compensate for the nonlinear characteristic of the pitch angle to the wind speed. Also, a speed sensorless technique estimating the rotational speed is employed for the proposed control method. The effectiveness of the proposed method is verified by MATlab.simulation results for a 2-MW PMSG wind turbine system. © Springer-Verlag Berlin Heidelberg 2014.

关键词： Fuzzy logic

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Nonlinear control of PMSG wind turbine systems

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International Conference on Advanced Engineering Theory and Applications 2013, AETA 2013

作者： Van, Tan Luong Truong, Trung Hieu Nguyen, Buu Pham Nhat Tan Trang, Tran Thanh Department of Basics Ho Chi Minh City Electric Power College 554 Ha Huy Giap District 12 Ho Chi Minh City Viet Nam Department of Electrical-Mechanical Engineering Ho Chi Minh City Electric Power College 554 Ha Huy Giap District 12 Ho Chi Minh City Viet Nam Department of Power System Ho Chi Minh City Electric Power College 554 Ha Huy Giap District 12 Ho Chi Minh City Viet Nam Department of Electronics and Telecommunication Engineering Van Hien University 665-667-669 Dien Bien Phu District 3 Ho Chi Minh City Viet Nam National Key Lab. of Digital Control and System Engineering University of Technology Vietnam National University Ho Chi Minh City 268 Ly Thuong Kiet District 10 Ho Chi Minh City Viet Nam

ISBN: (纸本)9783642419676

This paper proposes a control scheme for the permanent magnet synchronous generator (PMSG) wind power system. The DC-link voltage can be controlled at the machine-side converter (MSC), while the grid-side converter (GSC) controls the grid active power for a maximum power point tracking (MPPT). At the grid fault condition, the DC-link voltage controller is designed using a feedback linearization (FL) theory. For the MPPT, it is also developed for the PMSG wind turbines to continuously generate the maximum electrical power without any sensor. The validity of this control algorithm has been verified by simulation 2-MW PMSG wind turbine system. © Springer-Verlag Berlin Heidelberg 2014.

关键词： Feedback linearization

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A new wireless time synchronization approach for whole-view test system in smart substation

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Dianli Xitong Zidonghua/Automation of Electric power systems 2013年第9期37卷 103-109页

作者： Jing, Shi Huang, Qi Zhen, Wei Wu, Jie Key Lab. of Wide-Area Measurement and Control on Power System of Sichuan Province University of Electronic Science and Technology of China Chengdu 611731 China Sichuan Electronic Power Research Institute Chengdu 610072 China

The whole-view test method for smart substation is a new test approach in which data transmission and time synchronization are implemented with wireless communication. This paper proposes a new time synchronization method based on wireless local area networks (WLAN) to satisfy the demand of synchronized triggering of data and time lab.ling in the system. The proposed method is implemented by integrating IEEE 1588 precise time protocol and IEEE 802.11 WLAN standard considering the specialty of transmission mechanism and data link in wireless communication, thus current availab.e time synchronization method is improved. Simulation result shows that the precision of wireless time synchronization can be improved up to ±10 μs. © 2013 State Grid Electric power Research Institute Press.

关键词： IEEE Standards

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Period distribution analysis of some linear maps

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Communications in Nonlinear Science and Numerical Simulation 2012年第10期17卷 3848-3856页

作者： Fei Chen Xiaofeng Liao Kwok-wo Wong Qi Han Yang Li State Key Lab. of Power Transmission Equipment and System Security College of Computer Science Chongqing University Chongqing 400044 PR China Department of Electronic Engineering City University of Hong Kong Hong Kong PR China Department of Automatic Control and Systems Engineering The University of Sheffield UK

This paper discusses period properties of some linear maps which are employed in various applications such as image encryption, public key cryptography and watermarking. Conditions for the bijectiveness of such maps and the existence of a period are presented. Period structure is also given. Then, the recurrence equation theory is adopted to address the period distribution problem. Finally, a framework to solve the problem is proposed with a demonstration of its effectiveness and efficiency into some applications.

关键词： Linear map Period distribution Periodic orbit Dynamical system Cat map

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Isolation fault forecasting model for intelligent high voltage circuit breaker

Isolation fault forecasting model for intelligent high volta...

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2011 1st International Conference on Electric power Equipment - Switching Technology, ICEPE2011

作者： Teng, Yun Xu, Jianyuan Lin, Xin Liaoning Provincial Key Lab. of Power System Safe Operation and Monitoring Shenyang University of Technology Shenliao Xi Road 111 Shenyang 110870 China

ISBN: (纸本)9781457712722

A novel risk forecasting model of high voltage circuit breaker insulation based on double artificial neural networks is proposed in the paper by analysis of the relationship between ESDD, flashover voltage and environmental factors. The data used to build the forecasting model is obtained from artificial pollution test. The proposed insulation fault risk forecasting model calculates the insulation fault probability under given environmental factors. Results of artificial pollution text indicate that the forecasting of this method is satisfied to practical application and useful to theoretical research. © 2011 IEEE.

关键词： Pollution

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Adaptive variable selection using non-negative garrote with application to soft sensor and fault detection

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Nanjing Li Gong Daxue Xuebao/Journal of Nanjing University of Science and Technology 2012年第SUPPL.2期36卷 82-86页

作者： Wang, Jian-Guo Guo, Yong Ma, Shi-Wei Pan, Chang-Chun Jang, Shi-Shang Wong, David Shan-Hill School of Mechatronical Engineering and Automation Shanghai Key Lab. of Power Station Automation Technology Shanghai University Shanghai 200072 China Department of Automation Key Laboratory of System Control and Information Processing Shanghai Jiao Tong University Shanghai 200240 China Department of Chemical Engineering National Tsing-Hua University Taiwan 30013 Taiwan

In order to improve the function of soft sensor to conduct variable selection, fault detection and model structure identification in the case of faulty state, a design method of new soft sensor is studied though the variable selection algorithm. A non-stationary time serial is introduced to describe the process output not being reflected by sensor variables and to detect whether the process enters the faulty state. A non-negative garrote method is adopted to identify the model structure and a modeling method for new soft sensors is presented. The obtained model can be used for both prediction, and detection of structural model change and the emergence of disturbance. Compared with the ordinary soft sensor based on partial least square algorithm, the advantages of the proposed method are demonstrated by a simulation example and an industrial application to temperature prediction of a blast furnace hearth.

关键词： Fault detection

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Cascaded battery energy storage system based on dual active bridges and a common dc bus

Cascaded battery energy storage system based on dual active ...

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2010 9th International power and Energy Conference, IPEC 2010

作者： Jin, Yiding Song, Qiang Liu, Wenhua Sun, Weixin State Key Lab. of Control and Simulation of Power System and Generation Equipments Tsinghua University Beijing China

ISBN: (纸本)9781424473991

Along with the increasing system capacity, large-scaled energy storage systems are supposed to be connected into 10kV or higher networks. Urban network has strict criterions on power quality of the power electronic devices connected. Moreover, the occupancy and noise of industrial frequency transformers also become restraints to the promotion of urban network energy storage. For that reason, this paper proposes a battery energy storage system based on cascaded dc-ac converter, dual active bridges, and a common dc bus. High frequency transformers are used to replace the industrial frequency transformer for insulation, and battery groups are connected to the common dc bus with respective dc-dc interfaces. This multilevel converter system is easy to modularize, easy to extend, and allows different kinds of batteries to work together. The main circuit and proper control system are designed, with the soft-switching condition and current control issues of the dual active bridge analyzed in detail. The simulation results from EMTDC model verify the operation principles and corresponding control strategies. ©2010 IEEE.

关键词： Electric inverters

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New type of fiber optic sensor network for smart grid interface of transmission system

New type of fiber optic sensor network for smart grid interf...

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作者： Huang, Qi Zhang, Changhua Liu, Qunying Ning, Yan Cao, Yongxing Chengdu Sichuan 610054 China Sichuan Provincial Key Lab. of Power System Wide-area Measurement and Control Sichuan Electric Power Test and Research Institute No. 23 Qinghua Rd. Chengdu 610072 Sichuan China

ISBN: (纸本)9781424483570

Smart Grid is aimed to incorporate monitoring, analysis, control and communication capabilities to improve reliability and energy efficiency. However, currently there is no enough sensor to provide information interface for the implementation of smart grid. Therefore, new types of sensors should be deployed to assist the implementation of smart grid. This paper proposes a novel scheme, in which new type of fiber optic sensors (as compared with traditional Farady effect based fiber optic sensor used in power system instrumentation) are used to provide multiple types of information for smart grid. The new Fiber Gragg Gratting (FBG) is advantageous in that it can collect variant types of information and can form a sensor network. A transmission line monitoring system with distributed fiber optic senor setwork is designed, and the procedures to evaluate the status of the overhead transmission line (such as sag, vibration, and galloping) are proposed. A testing setup is built at lab.ratory, and it is shown that the FBG sensor is capable of obtaining the comprehensive information for evaluating the status of the overhead transmission line. ©2010 IEEE.

关键词： Smart power grids

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