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Annual Conference of the IEEE Industrial Electronics Society

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

This paper proposes a thermal network parameter estimation method to find RC parameters of the Cauer network using cooling curve of IGBT module. The solutions are developed by exploiting the relationship between thermal network parameters and time constants of junction temperature response curves. Experimental tests are performed to validate the accuracy of the developed method. Advantages of the proposed method include no need to know the power loss information of IGBT and no need to heat the IGBT module up to thermal steady-state. Moreover, the proposed method is able to obtain complete RC parameters of the Cauer network. In addition, we show that the identified RC parameters can be used for condition monitoring and junction temperature estimation.

关键词： Temperature measurement Junctions Insulated gate bipolar transistors Cooling Heating systems Temperature sensors Thermal resistance

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Loss Characteristic Analysis of Small and Medium-sized Induction Motors Fed by PWM Inverter Based on the Experiment Measurements

Loss Characteristic Analysis of Small and Medium-sized Induc...

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Annual Conference of the IEEE Industrial Electronics Society

作者： Dongdong Zhang Jing Shi Haisen Zhao Thomas Wu School of Electrical Engineering Xi'an Jiaotong University Xi'an China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources (NCEPU) Beijing China Department of Electrical and Computer Engineering University of Central Florida Orlando Florida USA

In order to improve the efficiency, we should know the loss characteristics of inverter-fed induction motors. We first have to accurately measure the total motor losses, and then obtain each loss component by reasonably separate the total motor losses. In this paper, the total losses of a 5.5 kW, a 22 kW, a 30 kW, a 37 kW, a 45 kW and a 55 kW induction motors under sinusoidal supply and PWM inverter supply conditions are measured. The total losses of those motor are divided into five parts based on the loss segregation procedure IEEE Std 112-B with some special considerations, such as using AC resistance to replace the dc resistance for taking skin and proximity effect into account. Finally, the characteristics of the stator I~2R losses, rotor I~2R losses, friction and windage losses (F&W losses), core losses as well as stray-load losses of those motor under sinusoidal supply and PWM inverter supply conditions are analyzed.

关键词： Loss measurement Induction motors Stator windings Rotors Inverters Pulse width modulation

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A Fast AGFD Identification Method and the Resulting Air-gap Force Analysis of Cage Induction Motors with Skewed Rotor Bars

A Fast AGFD Identification Method and the Resulting Air-gap ...

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Annual Conference of the IEEE Industrial Electronics Society

作者： Dongdong Zhang Jing Shi Thomas Wu School of Electrical Engineering Xi'an Jiaotong University Xi'an China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources (NCEPU) Beijing China Department of Electrical and Computer Engineering University of Central Florida Orlando Florida USA

The induction motor with skewed rotor bars is an effective motor structure for eliminating the slot harmonic fields, and the resulting noise and vibration. 2-D multi-slice finite element method (FEM) is typically used to analyze the performance of the induction motor with skewed rotor bars. However, in order to achieve high accuracy, the number of the slices is generally very high, which is also a time-consuming work. In this paper, a fast identification method of air-gap flux density (AGFD) is proposed. In the proposed method, the AGFD calculated by the 2-D multi-slice FEM is post-processed by a skewed factor. In order to achieve a relatively high accuracy, the number of slices of the 2-D multi-slice FE models can be significantly reduced by using the proposed method. And in this paper, based on the proposed method, the influence of the skewed rotor bars on the air-gap force of a 5.5 kW motor are also studied.

关键词： Induction motors Rotors Bars Harmonic analysis Air gaps Force Finite element analysis

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Influence of AC Voltage on the Positive DC Corona Current Pulses in a Wire-cylinder Gap

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CSEE Journal of power and Energy systems 2016年第4期2卷 58-65页

作者： Zhenguo Wang Tiebing Lu Xiang Cui Xuebao Li Huseyin Hiziroglu State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources the North China Electric Power UniversityBeijing102206China Department of Electrical and Computer Engineering Kettering UniversityFlintMichigan48504USA

In the development of hybrid HVDC and HVAC transmission lines,the study of radio interference is an important *** corona current pulses from high voltage transmission lines are the main source of radio *** this paper,the design of a wire-cylinder gap electrode system is presented to study the influence of AC voltage on the characteristics of positive corona current *** study shows that the mode of the current pulses is different from that of either DC or AC corona *** parameters of the pulses,such as rise time,half wave time,duration time,repetition rates,average amplitude,and time intervals of secondary pulses are all statistically analyzed in this *** empirical formulas for the repetition rates with different AC voltages are presented.A theoretical explanation based on an ion cloud model is given to reveal the mechanism behind the influence of AC voltage on positive corona *** experimental results could provide some references for the prediction of radio interference from hybrid AC/DC transmission lines.

关键词： AC voltage corona discharge current pulses positive DC corona radio interference

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Regional pole placement and feedback linearization of nonlinear wind turbine control system

Regional pole placement and feedback linearization of nonlin...

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American Control Conference

作者： Zhongwei Lin Zhenyu Chen Xiaoming Li the State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources School of Control and Computer Engineering North China Electric Power University Beijing 102206 P. R. China the School of Automation Engineering Northeast Electric Power University Jilin 132012 P. R. China

ISBN: (纸本)9781509045839

This paper combines the regional pole placement technique with the geometric control theory to design the feedback control for the nonlinear wind turbine generator system (WTGS), which can improve the dynamic response efficiently. Through constructing the appropriate diffeomorphism and feedback linearization, the key variables of the original nonlinear WTGS can be remained in the transformed linear-form system, which sustains that the dynamic response could be adjusted in the transformed linear framework. Due to the multi-input multi-output (MIMO) and high-order characteristics, the regional pole placement technique is then applied on the feedback linearized WTGS, which can guarantee the limitation of several performances related to the dynamic response. In such a way, the dynamic response of WTGS can be adjusted through the feedback linearization and regional pole placement techniques. Simulation results show the effectiveness of our results.

关键词： Feedback Linearization Nonlinear

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Energy management strategy research for residential microgrid considering virtual energy storage system at demand side

Energy management strategy research for residential microgri...

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International Conference on Electronic Measurement and Instruments, ICEMI

作者： Liu Changliang Wu Yanqun Bai Kang Liu Weiliang Chen Chen State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources Beijing China Automation Department North China Electric Power University Baoding China Department of mineral resources and architectural engineering Hebei Energy College of Vocation and Technology Tangshan China

An energy management strategy for residential microgrid is proposed, which takes the virtual energy storage system into consideration. Firstly, a heat transfer model is established based on the heat balance equation for the residential buildings with low temperature floor radiant heating / cold and the potential of the energy storage is analyzed. After that, the residential building is used as a virtual energy storage system, and a micro grid energy management model based on economy and comfort is constructed. Finally, taking the winter heating scenario as an example, the scheduling results under different energy management strategies are analyzed for two typical residential microgrids. The results show that the proposed energy management strategy can tap the energy storage potential of residential buildings, so as to effectively reduce the operating costs of microgrid under the premise of ensuring user comfort.

关键词： Resistance heating Floors Microgrids Energy storage Silicon

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DC link capacitor voltage balancing of a dual three-level T-Type AC drive using switching state redundancy

DC link capacitor voltage balancing of a dual three-level T-...

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2017 IEEE International Electric Machines and Drives Conference, IEMDC 2017

作者： Salem, A. De Belie, F. Youssef, T. Melkebeek, J. Mohamed, O.A. Abido, M.A. Electrical Engineering Department King Fahd University for Petroleum and Minerals Dhahran Saudi Arabia Electrical Energy System and Automation Department EELAB Ghent University Belgium Energy Systems Research Laboratory ECE Department Florida International University MiamiFL United States Electrical Power and Machines Department Helwan University Cairo Egypt

ISBN: (纸本)9781509042814

Multilevel converters, which are supplied by cascaded capacitors and non-isolated DC sources, can not operate without capacitor voltage balancing. This paper proposes a capacitor voltage balancing technique for the dual three-level T-Type advanced converter topology. The reason behind the capacitor voltage unbalance, of this topology, is discussed and clarified by using the converter power circuit connected to an open-end three-phase load. The converter switching states are studied and classified to three different groups according to their effect on the capacitor balancing. The proposed capacitor balancing algorithm is implemented based on switching state redundancy. This algorithm was tested by simulation through Matlab/Simulink and implemented experimentally using a field programmable gate-Array digital controller. The proposed capacitor voltage balancing technique has applied to a dual three-level T-Type converter AC drive system. The simulation and the experimental results were compared and analysed. Both the simulation and the experimental results are in agreement verifying the proposed algorithm. © 2017 IEEE.

关键词： Redundancy

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Frequency aware robust economic dispatch

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Journal of Modern power systems and Clean Energy 2016年第2期4卷 200-210页

作者： Donglei SUN Xueshan HAN Bo ZHANG Mingqiang WANG Tianyu DING Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong UniversityJinan 250061China Department of Electrical and Computer Engineering University of AlbertaEdmontonAB T6G 2G7Canada

This paper proposes a novel frequency aware robust economic dispatch (FARED) approach to exploit the synergistic capability of accommodating uncertain loads and renewable generation by accounting for both the frequency regulation effect and optimal participation mechanism of secondary regulation reserves for conventional units in response to uncertainties in the robust optimization counterpart of security constrained economic *** FARED is formulated as a robust optimization *** this formulation the allowable frequency deviation and the possible load or renewable generation curtailments are expressed in terms of variable uncertainty *** variables in the formulation are described as interval variables and treated in affine *** order to improve the computational tractability,the dominant constraints which canbe the candidates of tight transmission constraints are determined by complementarity *** the robust optimization problem is simplified to a bilinear programming problem based on duality ***,the effectiveness and efficiency of the proposed method are illustrated based on several study cases.

关键词： Economic dispatch Frequency regulation effect Interval uncertainty Robust optimization Affine policy Complementarity constraints

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Global Stabilization of a Chain of Integrators by a Switching Event-Triggered Bounded Control

Global Stabilization of a Chain of Integrators by a Switchin...

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American Control Conference

作者： Yijing Xie Zongli Lin Department of Automation and Key Laboratory of System Control and Information Processing of the Ministry of Education Shanghai Jiao Tong University Shanghai 200240 China Charles L. Brown Department of Electrical and Computer Engineering University of Virginia Charlottesville VA 22904-4743 USA

ISBN: (纸本)9781509045839

This paper studies the problem of global stabilization of multiple integrator systems using event-triggered bounded controls. The linear system is described by a chain of integrators of arbitrary length n. A switching event-triggered bounded control law is constructed. This control law switches among a sequence of n event-triggered control laws. A switching strategy is designed for the selection of an individual event-triggered control law and an event-triggering strategy is designed for updating the control value of each of these control laws. This switching event-triggered control law is shown to achieve global asymptotic stabilization. The absence of the Zeno behavior is also established. Simulation results are given to illustrate the theoretical results.

关键词： Event-triggered control bounded control global stabilization bounded control Event trigger control law integrators Chains linearly ordered set switching

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Advanced multilevel converter applied to an open-ends induction machine: Analysis, implementation and loss evaluation

Advanced multilevel converter applied to an open-ends induct...

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2017 IEEE International Electric Machines and Drives Conference, IEMDC 2017

作者： Salem, A. Belie, F.D. Yousef, T. Melkebeek, J. Mohamed, O.A. Abido, M.A. Electrical Engineering Department King Fahd University for Petroleum and Menials Dhahran Saudi Arabia Dept. of Electrical Power and Machines Helwan University Cairo Egypt Dept. of Electrical Energy System and Automation Ghent University Gent Belgium Dept. of Energy Systems Research Laboratory ECE Department Florida International University MiamiFL United States

ISBN: (纸本)9781509042814

This paper studies the performance of the dual 3-level T-Type converter topology, as an advanced 5-level converter, applied to an open-ends induction machine. The performance is evaluated based on harmonic analysis, converter power loss and the steady-state machine performance. An advanced technique based on space-vector pulse-width modulation is proposed to reduce the converter switching stress as well as switching losses. A simulation based on a Matlab/Simulink program for the proposed topology as well as for some conventional multilevel converter topologies is performed. A practical implementation, based on a field-programmable gate array, for the proposed topology is presented, discussed and analyzed. A comparison between experimental and simulation results is conducted. The results show that the advanced topology reduces the harmonic content, the machine torque ripple, and the overall drive losses compared to three-level converters. Also, the proposed topology and the proposed switching technique reduce the converter losses by 40% compared to conventional five-level diode clamped converter. © 2017 IEEE.

关键词： Topology

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