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6th International Conference on Renewable Power Generation

作者： Lu, Xiaojun Xiang, Wang Lin, Weixing Wen, Jinyu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan Hubei Province430074 China TBEA China Xinjiang Sunoasis Co. Ltd Xi'an Shanxi Province710000 China

This study researched the analytical models for the modular multilevel converter (MMC) with its arm mixed with half-bridge submodules and full-bridge submodules, named as hybrid MMC. The state-space model and steady-state model of hybrid MMC under rotating frame are proposed. The phasor modelling method is employed to describe the internal dynamics of the converter. Modulation signals combined with the elementary control of hybrid MMC are considered in the modelling. The accuracy of the analytical models is verified by extensive time-domain simulation in contrast with PSCAD/EMTDC models. A 'select and check' method is proposed to determine the feasible operating zone of hybrid MMC considering multiple operating constraints. The operating zones of the test hybrid MMC under different DC voltage levels are analysed. © 2017 Institution of engineering and technology. All rights reserved.

关键词： Analytical models

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A Modified Back/Forward Sweep Method Based on the Electricity Consumption Data

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Energy and Power engineering 2017年第4期9卷 176-182页

作者： Yanlu Huang Yan Li Feng Chen Xu Zheng Jing Tang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China State Grid Hubei Economic & Technology Research Institute Wuhan China

With the development of distribution automation system, the centralized meter reading system has been adopted more and more extensively, which provides real-time electricity consumption data of end-users, and consequently lays foundation for operating condition on-line analysis of distribution network. In this paper, a modified back/forward sweep method, which directly uses real-time electricity consumption data acquired from the centralized meter reading system, is proposedto realize voltage analysis based on 24-hour electricity consumption data of a typical transformer district. Furthermore, the calculated line losses are verified through data collected from the energy metering of the distribution transformer, illustrating that the proposed method can be applied in analyzing voltage level and discovering unknown energy losses, which will lay foundation for on-line analysis, calculation and monitoring of power distribution network.

关键词： Low-Voltage Distribution Network Back/Forward Sweep Method Electricity Consumption Data On-Line Analysis and Calculation

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LIF diagnostics of hydroxyl radical in a methanol containing atmospheric-pressure plasma jet

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Chinese Physics B 2016年第10期25卷 238-243页

作者：钱沐杨刘三秋裴学凯卢新培张家良王德真 Department of Physics Nanchang University China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology School of Physics and Optoelectronic Technology Dalian University of Technology

In this paper, a pulsed-dc CH;OH/Ar plasma jet generated at atmospheric pressure is studied by laser-induced fluorescence（LIF） and optical emission spectroscopy（OES）. A gas–liquid bubbler system is proposed to introduce the methanol vapor into the argon gas, and the CH3OH/Ar volume ratio is kept constant at about 0.1%. Discharge occurs in a 6-mm needle-to-ring gap in an atmospheric-pressure CH;OH/Ar mixture. The space-resolved distributions of OH LIF inside and outside the nozzle exhibit distinctly different behaviors. And, different production mechanisms of OH radicals in the needle-to-ring discharge gap and afterglow of plasma jet are discussed. Besides, the optical emission lines of carbonaceous species, such as CH, CN, and C;radicals, are identified in the CH;OH/Ar plasma jet. Finally, the influences of operating parameters（applied voltage magnitude, pulse frequency, pulsewidth） on the OH radical density are also presented and analyzed.

关键词： atmospheric-pressure plasma jet hydrocarbon OH radicals laser-induced fluorescence

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Post-fault model predictive control of asymmetrical six-phase permanent magnet machine with improved mathematical model

Post-fault model predictive control of asymmetrical six-phas...

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2017 IEEE International Electric Machines and Drives Conference, IEMDC 2017

作者： Lu, Hanxiao Li, Jian Qu, Ronghai Ye, Donglin Lu, Yang Zhang, Rui State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781509042814

Multiphase machines are superior to three-phase machines with high reliability and large power capability. In the post-fault operation when one phase of an induction machine is open circuit, model predictive control has been proved to have rapid current, torque and speed response. However, the mathematical model in post-fault operations of multiphase permanent magnet (PM) machines is quite different from induction machines and it has rarely been analyzed before, so it still needs further study. This paper looks deeply into the post-fault model of an asymmetrical six-phase PM machine and its drive system, and proposes an improved modeling method in which the phase voltages and inductance matrix are amended. Thus the concision of the prediction process can be maintained the same as in normal operations. Simulation results are given and proves the efficiency of the proposed method in both dynamic and steady states of post-fault operation. © 2017 IEEE.

关键词： Model predictive control

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Control and operation of a hybrid HVDC integrating wind farm based on SB-MMC and LCC

Control and operation of a hybrid HVDC integrating wind farm...

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6th International Conference on Renewable Power Generation

作者： Sun, Shida Xiang, Wang Yao, Liangzhong Li, Yan Wen, Jinyu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan Hubei Province430074 China China Electric Power Research Institute State Key Laboratory of Operation and Control of Renewable Energy and Storage Systems Beijing100192 China

To integrate offshore wind power, a hybrid high-voltage DC (HVDC) system consisting of the self-blocking modular multilevel converter (SB-MMC) and line commutated converter (LCC) is investigated. The SB-MMC is installed at the sending end to support the wind farm and the LCC is installed at the power grid side. The start-up strategy of the hybrid system is studied. To eliminate the transients during start-up, a virtual limiting resistor is introduced for the LCC and a grouping sequentially charging method is proposed for the SB-MMC. The DC fault behaviour and isolation of the hybrid system is analysed. The response during AC fault and commutation failure at LCC is considered. Finally, the feasibility of start-up, DC fault isolation and AC fault ride through of the hybrid HVDC system is verified by simulations in power systems computer-Aided design/electro-magnetic transient design and control. © 2017 Institution of engineering and technology. All rights reserved.

关键词： Hybrid systems

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Reactive power optimisation design and fault ride through of MMC-PLUS

Reactive power optimisation design and fault ride through of...

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6th International Conference on Renewable Power Generation

作者： Yang, Zhihan Xiang, Wang Yao, Liangzhong Wang, Zhibing Wen, Jinyu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan Hubei Province430074 China China Electric Power Research Institute State Key Laboratory of Operation and Control of Renewable Energy and Storage Systems Beijing100192 China

To integrate bulk wind power, a modular multilevel converter (MMC)-PLUS composed of the series connection of line commutated converter (LCC) and MMC is investigated. The system combines the advantages of LCC and MMC, such as high power, high voltage, selfcommutating and direct current (DC) fault blocking capability. However, due to the coupled control of active power and reactive power, much reactive power should be compensated during the operation of LCC. The study makes a detailed analysis and optimisation of reactive power compensation devices taking into account the PQ operation curve of MMC and making full use of the capacity of MMC. In addition, further studies the control strategy of DC fault isolation and system restart under DC fault. The effectiveness of the reactive power configuration and DC fault strategy is verified by simulations in PSCAD/EMTDC. © 2017 Institution of engineering and technology. All rights reserved.

关键词： Reactive power

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Power converter-based aircraft starting/generating system emulator

Power converter-based aircraft starting/generating system em...

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Annual Conference of Industrial Electronics Society

作者： Lei Zhu Dong Jiang Ronghai Qu State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

In order to optimize aircraft performance and decrease operating and maintenance costs, traditional aircraft is moving towards a more electric aircraft. Moreover, integrated starting/generating system is one of the key components in a more electric aircraft. To determine whether starting/generating system meets the intended requirements, it is necessary to test the system. Herein, this paper is going to present a power converter-based test platform to replace traditional test benches for the considerations of flexibility, costs and safety. Firstly, applications and advantages of power converter-based test platform are illustrated. Secondly, the structure of power converter-based starting/generating system emulator is proposed. Next, operating principle of the emulator is comprehensively illustrated. Finally, MATLAB/Simulink based simulation model is build up to evaluate the proposed power electronics emulator for both starting and generating performance. The simulation results can support the working principle of the power electronics emulator and could be used for prototype development.

关键词： Synchronous motors Generators Aircraft Aerospace electronics AC motors Mathematical model Atmospheric modeling

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Design of a linear vernier permanent magnet machine with high thrust force density and low thrust force ripple

Design of a linear vernier permanent magnet machine with hig...

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2017 IEEE International Electric Machines and Drives Conference, IEMDC 2017

作者： Huo, Yongsheng Qu, Ronghai Gao, Yuting Jia, Shaofeng Fan, Xinggang State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781509042814

This paper introduces a novel linear vernier permanent magnet machine (H-LVPMM) with high force density and low force ripple. The permanent magnets (PMs) on secondary uses Halbach array, which can provide a larger flux density in the air gap than that of the conventional surface-mounted PMs configurations, and the primary is composed of three modules, which are separated by two flux barriers. Moreover, the three-phase winding connections and the length of the two flux barriers are specially designed to minimize the cogging force and the ripple force. In order to show the superiority of the H-LVPMM, a conventional linear vernier permanent magnet machine using surface-mounted PMs (S-LVPMM) is built and compared to the proposed machine in terms of back electromotive force (back-EMF), cogging force, average thrust force, thrust force ripple, etc. © 2017 IEEE.

关键词： Permanent magnets

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Look-up table approaches for TCSC impedance control considering thyristor conduction characteristic

Look-up table approaches for TCSC impedance control consider...

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6th International Conference on Renewable Power Generation

作者： Yang, Yi Zhu, Xiaojun Gao, Lei Yuan, Yubo Yao, Wei State Grid Jiangsu Electric Power Research Institute Nanjing China Foshan Electric Power Company Foshan China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Hubei Sheng China

Thyristor-controlled series capacitor (TCSC) characteristic curves of fundamental frequency impedance change with line current considering thyristor conduction characteristic, which results in experimental deviation when using the open-loop impedance control. To end this, this study derives the TCSC fundamental frequency impedance mathematic model to reveal the theoretical mechanism that fundamental frequency impedance changes with line currents. This study proposes two new look-up table approaches to mitigate deviation of the least square look-up table approach using the three-point quadratic interpolation and linear interpolation algorithms. The proposed methods have been validated via TCSC physical simulation experiments. © 2017 Institution of engineering and technology. All Rights Reserved.

关键词： Thyristors

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AC and DC fault ride through hybrid MMC integrating wind power

AC and DC fault ride through hybrid MMC integrating wind pow...

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6th International Conference on Renewable Power Generation

作者： Cao, Shuai Wang, Xiang Yao, Liangzhong Yang, Bo Wen, Jinyu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan Hubei Province430074 China State Key Laboratory of Operation and Control of Renewable Energy and Storage Systems China Electric Power Research Institute Beijing100192 China

To transmit bulk wind power over long distance, using high-voltage direct current (HVDC) transmission technology with overhead lines is a preferred approach. Since direct current (DC) faults are frequent in overhead lines, this study adopts the hybrid modular multilevel converter (MMC) based on half bridge sub-module and full bridge sub-module to integrate wind power. The design of controllers, the alternating current (AC) and DC fault ride-through strategy of the hybrid MMC-HVDC system will be presented. Since the wind power continues injecting into the system during the faults, the damping resistor is adopted to dissipate the surplus wind power. The coordination control of the damping resistor and the chopper resistor inside the wind turbine is designed. Finally, the performance during AC, DC faults ride though is verified by extensive simulations. © 2017 Institution of engineering and technology. All rights reserved.

关键词： Wind power

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