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The study on CT saturation caused by the circulating current in the delta-winding of converter transformer and its impact on the protection in HVDC system

The study on CT saturation caused by the circulating current...

引用

12th IET International Conference on AC and DC Power Transmission (ACDC 2016)

作者： Kanjun Zhang Xuanwei Qi Xianggen Yin Kun Chen Wei Hu Shiyun Zhang State Grid Hubei Electric Power Research Institute Wuhan China 430077 State Key Laboratory of Advanced Electromagnetic Engineering and Technology (Huazhong University of Science & Technology) Wuhan China 430074

In the typical HVDC power system, the current transformers (CTs) between the Y-delta converter transformer and the converter bridge is located in the delta-winding of the transformer. Under such condition, the measuring current of these CTs includes the zero-sequence circulating current of the delta-winding. In the case of the adjacent transformer energization or the fault of AC system, the zero-sequence circulating current in the delta-winding maybe very large containing a great amount of dc component. Thus the CTs will be saturated, resulting in the misoperation of the relevant protection in HVDC system, such as the bridge current differential protection. This sort of misoperation seriously threatens the safe and sound operation of the HVDC power system. In this paper, the misoperation cause is analysed in detail via the PSCAD/EMTDC-based simulation. Based on this, a method is proposed to prevent this sort of misoperation by utilizing the zero-sequence circulating current as the restraint quantity.

关键词： converter transformer HVDC current transformer converter differential protection

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Research of Hierarchical Control Strategy for Photovoltaic & Battery Storage System

Research of Hierarchical Control Strategy for Photovoltaic &...

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2016 3rd International Conference on engineering technology and Application（ICETA 2016）

作者： Qian Sun Qi Lei Baofu Guo Jianwei Ma Chang Ye Shihong Miao Electric Power Research Institute of State Grid Henan Electric Power Company State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology XJ Group Corporation

According to the complementarity of photovoltaic and battery generation,the structure of photovoltaic and hierarchical storage system and its typical control methods are described in this paper,considering the demand of load side and distribution gird,hierarchical control strategy including primary control and secondary control is discussed,the model of converters and the control loop are presented in *** overall structure of hierarchical control composed by P-Q control and voltage-phase droop control is brief and cost-less.A simulation of the basic part in hierarchical control strategy under PSCAD/EMTDC environment is also included in this *** evaluation of hierarchical control strategy shows that photovoltaic and hierarchical storage system is practical for the application of distributed generators.

关键词： hierarchical control photovoltaic battery storage P-Q control

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The study on sympathetic inrush current of converter transformers in HVDC system and its identification method

The study on sympathetic inrush current of converter transfo...

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12th IET International Conference on AC and DC Power Transmission (ACDC 2016)

作者： Kanjun Zhang Xuanwei Qi Shiyun Zhang Wenbin Cao Fan Yang Xianggen Yin State Grid Hubei Electric Power Research Institute Wuhan China 430077 State Key Laboratory of Advanced Electromagnetic Engineering and Technology (Huazhong University of Science & Technology) Wuhan China 430074

ISBN: (纸本)9781510832657

This paper analyses the mechanism of the sympathetic inrush current of the converter transformer of the HVDC transmission system. The impacting factors of the sympathetic inrush current, including the system impedance, the closing angle and the initial remnant flux of the incoming transformer, and the operating condition of the HVDC system and so on, are analysed utilizing on the PSCAD/EMTDC soft. Based on this, this paper proposed two identification methods for the sympathetic inrush current and the simulation proofs the validity of these methods.

关键词： identification method HVDC sympathetic inrush current converter transformer

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Comparative study of metal obstacle variations in disturbing wireless power transmission system

Comparative study of metal obstacle variations in disturbing...

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IEEE Conference on electromagnetic Field Computation

作者： Pengcheng Zhang Qingxin Yang Xian Zhang Yang Li Lihua Zhu Hebei University of Technology Province-Ministry Joint Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability Tianjin China Tianjin Polytechnic University Tianjin Key Laboratory of Advanced Electrical Engineering and Energy Technology Tianjin China

ISBN: (纸本)9781509010332

In order to study and to compare the disturbances caused by different typical metal obstacles in wireless power transmission system. Finite element method (FEM) with coupled electric circuit is adopted to obtain the system performance changes due to electromagnetic parameters differences among typical metal materials. By separating and comparing specific material parameters during operation, detailed analysis of interference differences in system performances among metal materials are carried out. The impacts of metal obstacles to wireless power transmission system and its variation mechanisms are revealed. Besides, a prototype is built to validate the obtained analytical results.

关键词： Wireless power transmission Finite element analysis Copper Resonant frequency Prototypes Transmitters

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Investigation of the effect of particle-particle interactions on particle motion behavior in a gradient magnetic field using direct numerical simulation

Investigation of the effect of particle-particle interaction...

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2016年大连国际微纳流体和微流控芯片大会(2016 International Conference of Microfluidics, Nanofluidics and Lab-On-A-Chip

作者： Quanliang Cao Zhen Wang Shaozhe Zhang Xiaotao Han Liang Li Wuhan National High Magnetic Field Center Huazhong University of Science and Technology Wuhan430074 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China

Magnetic micro-and nanoparticles have been used in various microfluidic applications due to easy and flexible manipulation using magnetic *** separation processes, there are many benefits associated to the use of magnetic particles in promoting separation of biological components as compared to conventional separation processes, including high specificity, less chance of cell damage and shorter sorting time.

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Impact of the voltage feed-forward and current decoupling on VSC current control stability in weak grid based on complex variables 7

Impact of the voltage feed-forward and current decoupling on...

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7th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2015

作者： Huang, Jin Yuan, Xiaoming State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781467371506

With power converters integrated to the weak power grid, the influences of the voltage feed-forward and the current decoupling on the stability of the current control loop become obvious and need to be considered. Complex transfer functions are applied to analyze the effects of the feed-forward and cross decoupling compensation on the stability of the current control loop. Negative influences of the voltage feed-forward and the current decoupling on the current loop stability are demonstrated based on the complex root locus analysis. The effects of the voltage feed-forward are dominating while the effects of the current decoupling is ignorable. Simulations in Matlab/Simulink are carried out and the results validate the root locus analysis. © 2015 IEEE.

关键词： Simulink

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Six-phase double-stator inner-rotor axial flux PM machines with novel detached winding 7

Six-phase double-stator inner-rotor axial flux PM machines w...

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7th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2015

作者： Xiao, Linyuan Li, Jian Qu, Ronghai Li, Dawei Zhang, Rui State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781467371506

This paper proposes a novel detached winding for 6-phase double-stator inner-rotor axial flux PM machines. The connection of detached 6-phase winding is firstly given, followed by a comprehensive comparison with the conventional 6-phase winding in aspect of the winding factor, EMF and inductance, et al. Comparison of performance including rotor eddy current loss, torque ripple and rotor unbalanced axial force under fault tolerance operation is also mentioned in this paper. © 2015 IEEE.

关键词： Fault tolerance

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Input voltage feed-forward control strategy for cascaded DC/DC converters with wide input voltage range

Input voltage feed-forward control strategy for cascaded DC/...

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International Conference on Power Electronics and Motion Control (IPEMC)

作者： Guangjun Zhou Xinbo Ruan Xuehua Wang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Center for More-Electric-Aircraft Power System Nanjing University of Aeronautics and Astronautics Nanjing China

ISBN: (纸本)9781509012114

LLC resonant converter can implement Zero-Voltage-Switching (ZVS) in full load range through appropriately designing transformer's magnetic inductance, leakage inductance and circuit's quality factor. This kind of LLC resonant converter always runs in a nearly constant voltage gain no matter how the load changes. Thus it can be unregulated. By introducing an input stage converter which implements regulating output voltage, the converter can be optimally designed and high efficiency can be accomplished. But as the existence of a zero in right-hand half plane of Boost converter and the beat frequency characteristic of LLC converter, conventional Proportional-Integral (PI) controller can't meet the fast response requirement. This paper deduces a simplified expression of transfer function from control to output voltage and designs a lead compensator on the basis of PI controller. At the same time, an input voltage feed-forward control strategy is proposed to reduce output voltage variation when input voltage changes dramatically. Experimental results verify the effectiveness of the proposed control method.

关键词： Voltage control Integrated circuit modeling Resonant frequency Switching frequency Lead Transfer functions Power electronics

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A modular bidirectional buck/boost dc/dc converter suitable for interconnecting HVDC grids

A modular bidirectional buck/boost dc/dc converter suitable ...

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International Conference on Power Electronics and Motion Control (IPEMC)

作者： Zhongwei Xing Xinbo Ruan Huanmao Xie Xuehua Wang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan china Center for More-Electric-Aircraft Power System Nanjing University of Aeronautics and Astronautics Nanjing China

ISBN: (纸本)9781509012114

HVDC system has gained an advantageous development over traditional HVAC system in the market of long-distance bulk-power transmission. Although most of the existing HVDC transmissions are two-terminal, HVDC grids will likely be the choice for future power transfer. Dc/dc converters are key components in HVDC grids, facilitating the voltage stepping and energy exchange. This paper proposes a modular bidirectional buck/boost (MBBB) dc/dc converter which is suited to connect two individual HVDC grids. The half-bridge submodule (HBSM) concept derived from modular multilevel converter (MMC) is utilized, contributing to staircase switching sequences. By doing so, the dv/dt of the inductor voltage can be reduced. A sorting-based control strategy is applied to balance the submodule capacitor voltages, and the pulse-widths of the chain-link terminal voltages are controlled in closed loop to obtain the desired output voltage or current. Compared to the modular multilevel dc/dc converter, the MBBB dc/dc converter uses much smaller submodule capacitors, which will significantly reduce the system volume and weight. Simulation results validate the feasibility of the proposed converter.

关键词： Capacitors HVDC transmission Voltage control Inductors Modulation Power electronics Motion control

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A compact and polarization-insensitive perfect metamaterial absorber for electromagnetic energy harvesting application

A compact and polarization-insensitive perfect metamaterial ...

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Progress in electromagnetic Research Symposium (PIERS)

作者： Yong Zhi Cheng Cong Fang Zhe Zhang Bin Wang Junfeng Chen Rong Zhou Gong School of Optical and Electronic Information Huazhong University of Science and Technology Wuhan China School of Information Science and Engineering Wuhan University of Science and Technology China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781509060948

A polarization-insensitive and compact metamaterial absorber (MMA) was proposed in S band, which could exhibit a perfect absorption for electromagnetic (EM) energy harvesting application. The unit cell design consists of an electric-LC (ELC) resonator structure loaded with resistors backed by a complementary patch. The extracted effective EM parameters and simulated surface current distributions of the designed MMA indicate that the perfect absorption mainly originates from the impedance match and local magnetic resonance. The incident EM energy is mostly dissipated across resistors instead of the dielectric substrate, obviously unlike previous designs. In addition, our design is polarization-independent for normal incident EM waves. Moreover, the proposed MMA is also suitable for a wide variety of microwave EM energy harvesting applications.

关键词： Energy harvesting electromagnetics Absorption Metamaterials Resistors Dielectric substrates Dielectric losses

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