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Reconsideration of loop gain measurement of DC/DC converters

Reconsideration of loop gain measurement of DC/DC converters

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作者： Xiong, Chun Ruan, Xinbo Chen, Peilin Wang, Xuehua State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781479956982

There are mainly two existing loop gain measurement methods, which are the modulating signal perturbation method (MSPM) and the pulse-width signal perturbation method (PSPM). This paper points out that there are differences between these methods, and the loop gain measured by the PSPM can be more easily used in the guidance of the controller design. Since the circuit implementation of the PSPM is not easy, the additional PWM modulation method (APMM) and the sample-and-hold method (SHM) with uncomplicated circuits are proposed. The experiment results verify the correctness of the theoretical analysis and the proposed loop gain measurement methods. © 2014 IEEE.

关键词： DC-DC converters

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A high precision particle-moving algorithm for particle-in-cell simulation of plasma 5

A high precision particle-moving algorithm for particle-in-c...

引用

5th International Particle Accelerator Conference, IPAC 2014

作者： Li, Xiaofei Yue, Haikun Li, Dong Chen, Dezhi State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9783954501328

A new particle-moving algorithm for particle-in-cell simulation of plasma is developed based on the Linear Multistep Method. The conventional and the new algorithms are investigated by numerical experiments, which are conducted in three typical fashions of the electron motions in electromagnetic fields, that is, cyclotron in homogeneous magnetic field, drift in E×B field and motions in inhomogeneous magnetic field. The new algorithm not only improves the accuracy but also relaxes the time step condition for the simulation. It can increase the computation efficiency. Copyright © 2014 CC-BY-3.0 and by the respective authors.

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Input impedance modeling of digital controlled bi-directional DC/DC converter with inductor current feedback

Input impedance modeling of digital controlled bi-directiona...

引用

2014 International Power Electronics and Application Conference and Exposition, IEEE PEAC 2014

作者： Li, Xing Lin, Hua Wang, Hua State Key Laboratory of Advanced Electromagnetic Engineering and Technology HuaZhong University of Science and Technology Wuhan China

ISBN: (纸本)9781479967674

To investigate the input impedance of digital-controlled bi-directional DC/DC converters, this paper develops a modeling method based on the sampled-data approach. Because the nonlinear pulse-width modulator generates sideband components, the sideband effect occurs in a closed-loop converter. And the sampling process of a digital controlled system can significantly influence the sideband components. Taking these effects into account, the simplified sampled-data model is proposed, which is applicable up to the switching frequency. In a current-mode-controlled buck converter, the introduced model predicts the loop gain is unchanged while alters the method of modulation (leading-edge, trailing-edge, etc.), while the conventional average model fails to explain this phenomenon. And the proposed model can suits the measured data of input impedance while there is a considerable gap at half of the switching frequency between the conventional model and the measured data. Simulation and experimental results are provided to verify the achievements of the proposed model. © 2014 IEEE.

关键词： Feedback

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Design of microgrid energy management system based on labVIEW

Design of microgrid energy management system based on labVIE...

引用

3rd International Conference on Energy and Environmental Protection, ICEEP 2014

作者： Ge, Teng Yu Zhang, Bu Han Wu, Jun Li Jin, Bing Jie Zhao, Shuang Zhang, Kai Min State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9783038351368

Microgrid can be applied in different locations, relative to traditional power technology. It can improve the reliability of users of electricity and power system operation. Distributed power in microgrid needs real-time and multi-objective optimization management. This paper discusses functions and structure of microgrid energy management system(MGEMS) when connected with the main grid. Problems in long-term and short-term energy management of microgrid are discussed. From the point of view of the software platform, the system structure of MGEMS software are proposed. On this basis, this paper discusses the way to construct modules of MGEMS and their functions. © (2014) Trans Tech Publications, Switzerland.

关键词： Energy management systems

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Analysis of FSCW SPM servo motor with static, dynamic and mixed eccentricity in aspects of radial force and vibration

Analysis of FSCW SPM servo motor with static, dynamic and mi...

引用

作者： Jia, Shaofeng Qu, Ronghai Li, Jian Fu, Zansong Chen, Hong Wu, Leilei State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781479956982

This paper deeply discusses the effect of eccentricity, including static, dynamic and mixed eccentricity on the performance of FSCW SPM servo motor analytically and using finite element analysis (FEA) to validation. The effect of different kinds of eccentricity on magnetic field including magnet field and armature reaction field is described with three factor called modulation factor. The frequency and spatial mode order of radial force for static, dynamic and mixed eccentricity are analyzed and summarized with the analytical method and validated by FEA. It is found that compared with health machine, the frequency and mode order of radial force distort for eccentric machine: the static eccentricity (SE) extends the mode order but the frequency invariant while the dynamic eccentricity (DE) and mixed eccentricity (ME) change both the frequency and mode order of radial force. With the electromagnetic radial force obtained, we predict the vibration of the stator housing, and acoustic noise around the machine. The results show that due to the smallest spatial mode decrease and frequency spectra extension, the eccentric machines will have a large vibration both on load and without load for easier to resonance at some natural frequency compared with health machine. As a consequence, the noise level of eccentric machine will also enlarge. The analysis results is verified by experiment and can be explained reasonably. The work of this paper is helpful to design and analyze the motor which is used in the servo drive system and other similar occasions. © 2014 IEEE.

关键词： Finite element method

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Progress of the RF negative ion source research at HUST 5

Progress of the RF negative ion source research at HUST

引用

5th International Particle Accelerator Conference, IPAC 2014

作者： Chen, D.Z. Li, D. Liu, K.F. Yue, H.K. Li, X.F. Zhou, C. Liu, D.W. Huang, J. Zhang, Z. State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9783954501328

Powerful negative ion sources are the primary component for a neutral beam injection system used in fusion reactors. Under the support of the Ministry of Science and technology of China, HUST is developing an experimental facility for RF driven hydrogen negative ion source. The research work is presented. Copyright © 2014 CC-BY-3.0 and by the respective authors.

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Distribution network energy loss calculation method considering wind power integration

Distribution network energy loss calculation method consider...

引用

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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Optimization of 220kV CVT with series saturated reactor damper 5

Optimization of 220kV CVT with series saturated reactor damp...

引用

5th International Conference on Reliability of Electrical Products and Electrical Contacts, ICREPEC 2014

作者： Liu, Chun Cui, Zhiming Wang, Danjiang Cai, Bingbing Li, Zhenbiao State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9789881532329

Based on 220kV capacitive voltage transformer (CVT) equivalent circuit, a model of ferromagnetic resonance damping of CVT with series saturation reactor damper is built, with which a damp condition is derived theoretically. Combined with the data of 220kV CVT obtained from Jiangsu Wuxi Nissin co., LTD, the value of damp resistance is calculated. Simulation results are consistent with the experimental, which is shown that the proposed theory is validated and it can be use to design CVT with no Ferroresonance under certain condition.

关键词： Equivalent circuits

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Instantaneous compensation strategy of DC voltage component in the digital-analog integrated simulation interface

Instantaneous compensation strategy of DC voltage component ...

引用

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

作者： Linglong Cai Chengxiong Mao Jie Zeng Dan Wang Jiming Lu Zilong Xiao Junlin Li State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Electric Power Research Institute of Guangdong Power Grid Co. Ltd. Guangzhou China School of Electrical & Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781467371070

Digital-Analog integrated simulation combines the advantages of digital simulation with the advantages of physical simulation. The applicability of traditional simulation system is increased. The DC component of output voltage restricts the versatility of Digital-Analog integrated simulation. Unlike general inverters, the inverter of Digital-Analog integrated simulation interface (DAISI) has its unique features. A new control strategy is put forward to restrain the steady and transient DC component without additional hardware circuit. The feedback control loop along with the output voltage control loop adjust the duty cycle of sinusoidal pulse width modulation which compensate for the DC voltage component in the DAISI. Simulation and experiment verify the effectiveness of the control strategy.

关键词： Inverters Digital-analog conversion Voltage control Transient analysis Inductors Integrated circuit modeling Capacitors

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Output impedance analysis of digitally controlled DC-DC converter

Output impedance analysis of digitally controlled DC-DC conv...

引用

作者： Wang, Hua Lin, Hua Li, Xing Wang, Xingwei State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9781479956982

In this paper, the effect of digital control on output impedance converter is analyzed. The continuous time equivalent model is used to describe the digital control system in voltage mode, then output impedance is derived by small-signal model. The time delay caused by digital control is considered to analyze output impedance. The analysis indicates that digital control sharpens the peak of output impedance which appears near the crossover frequency, the factors which affect the peak are presented. Experimental results verified the theoretical analysis. © 2014 IEEE.

关键词： DC-DC converters

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