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Application of SFCLs to Inhibit Commutation Failure in HVdc Systems: Position Comparison and Resistance Recommendation

引用

Canadian Journal of Electrical and Computer engineering 2017年第1期40卷 31-40页

作者： Zhu, Jia Li, Yinhong Duan, Xianzhong State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

Commutation failure is one of the most common failures that may lead to serious consequences in high-voltage direct current (HVdc) systems. Superconducting fault current limiters (SFCLs) have been proved effective to inhibit commutation failures. In this paper, different installation positions of SFCLs are compared through three proposed evaluation indexes. The position between ac and dc systems is proved to have the best performance, and the position at the end of dc line performs moderately but costs less. Then, methods for calculating the convergence resistance of the SFCL are recommended. The theoretical method can draw the lower limit of the resistance quickly and reduce simulation time drastically when SFCLs are installed between ac and dc systems. In addition, an improved structure is presented to ensure fast recovery of an SFCL, so that the system can be restored quickly when the fault disappears. Simulations are carried out on PSCAD/EMTDC against the CIGRE HVdc benchmark system to verify the validity of the proposed installation scheme. © 2017 IEEE.

关键词： Superconducting fault current limiters

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Extended hybrid kinetic-magnetohydrodynamic model for ignited burning plasmas

arXiv

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arXiv 2019年

作者： Laishram, Modhuchandra Zhu, Ping Hou, Yawei CAS Key Laboratory of Geospace Environment Department of Engineering and Applied Physics University of Science and Technology of China Hefei230026 China International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan Hubei430074 China Department of Engineering Physics University of Wisconsin-Madison MadisonWI53706 United States

A brief review of the existing kinetic-magnetohydrodynamic(MHD) hybrid models for the alpha particle physics in burning plasma demonstrates that the pressure-coupling scheme is equivalent to the current-coupling scheme only in a specific dynamic regime where the alpha particle density is much lower than the background ion and electron. A more comprehensive kinetic-multifluid model is proposed for a proper account of the dynamical regime of the burning plasma where both the energetic alpha and the helium ash particles are present. The Kinetic-multifluid model is further simplified into an extended hybrid kinetic-MHD model in the MHD limit. This reduction process demonstrates that the existing pressure-coupling scheme is more extensive than the current- coupling scheme and sufficient for the wide range of dynamical regimes. This analysis further shows a significant change in the model equations mainly the generalized Ohm's law due to the contributions of a significant amount of alpha particles in the system. These models can be used for studies of the impact of the alpha particles present in ignited burning plasma and space plasma. Copyright © 2019, The Authors. All rights reserved.

关键词： Alpha particles

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An Energy Loss Calculating Method for Wind Power System Based on the Shape Factor

An Energy Loss Calculating Method for Wind Power System Base...

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2018 International Conference on Electrical engineering, Control and Robotics, EECR 2018

作者： Ruan, Bo Qian, Junjie You, Dahai Hou, Tingting Chen, Xi Mei, Zhen Research Institute of Economics and Technology Hubei Electric Power Company Limited Wuhan Hubei Province430077 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan Hubei Province430074 China

The large-scale access of the new energy makes various changes to the power system characteristics. For example, the acute volatility of the new energy such as wind power and photovoltaic energy makes the power-loss-calculation for the system more complex. The traditional typical daily method is inaccurate when used in new energy system because of its overlook of the generator output volatility. This paper proposes a new power-loss-calculation method for wind power system which based on the shape factor and gain a more accurate result. On the basis of this new calculating method, finds that the shape factor of the wind power plant for an hour period usually falls in a certain range. Therefore, proposes to directly use the expectation of shape factor in whole year to compute the annual energy loss with at least two values and once power flow calculation. And the acceptable relative error proves its large engineering practicability. © The Authors, published by EDP Sciences, 2018.

关键词： Energy dissipation

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Framework for Artificial Intelligence Analysis in Large-scale Power Grids Based on Digital Simulation

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CSEE Journal of Power and Energy Systems 2018年第4期4卷 459-468页

作者： Yong Tang Yanhao Huang Hongzhi Wang Can Wang Qiang Guo Wei Yao State Key Laboratory of Power Grid Safety and Energy Conservation China Electric Power Research InstituteBeijing 100192China College of Computer Science at Harbin Institute of Technology Harbin 150001China College of Computer Science at Zhejiang University Hangzhou 310027China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China

The planning,design,operation,control and scientific research of power systems all require a variety of simulation *** power grid simulation analysis is a fundamental supporting technology of large-scale power *** power grid simulation analysis,in addition to simulation calculations,there are many links for analysis and decision-making,relying on *** introduction of advanced artificial intelligence technology provides a new method to improve the efficiency and accuracy of power grid simulation ***,the research of the related artificial intelligence technologies face a great deal of new challenges due to the complexity of the largescale power grid simulation data,including massive volumes,high dimensionality,strong coupling and complex *** a great deal of knowledge and experience need to be integrated in the process of *** order to deal with these challenges,based on the existing works,this paper focuses on the core scientific problem of artificial intelligence analysis and decision making related to the massive simulation results of large-scale power grids,and proposes an artificial intelligence analysis method framework for large-scale power grids based on digital simulation,which includes the power grid simulation analysis knowledge model with application method,the power grid simulation knowledge mining method and the artificial intelligence models with transfer learning ability of diversified grids as well as analyzing and calculation adjusting for largescale power grid simulation results,*** work is expected to open up a new technical approach for large-scale power grid simulation analysis and provide strong technical support for the safe and stable operation of large-scale power grids.

关键词： Artificial intelligence digital simulation power system analysis

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An New Method for Detecting Harmonic Currents

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Journal of Physics: Conference Series 2020年第1期1659卷

作者： Xianfeng Chen Lin Guo Jie Gong Huizhou Power Supply Bureau Guangdong Power Grid Corporation Huizhou China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

The widespread use of power electronics has led to increasing problems with harmonics in power systems. The ip-iq detection method is a common method to detect harmonics. If there is a symmetry of the three phases of the power system, the ip-iq detection method can have very large errors in detecting the harmonic current. To solve this problem, an new method for detecting harmonic currents is proposed in this paper. The method solves the phase between the positive sequence voltage of each phase and the actual voltage by using the delay method to obtain the positive sequence fundamental signal of the fundamental current error problem. The simulation was then carried out using MATLAB/SIMULINK, and the simulation results confirmed the method still accurately detects harmonic currents in all cases. Therefore, this method is of great research importance for the elimination of harmonics.

关键词：

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Power System Stochastic Unit Commitment Model for Largescare Wind Power Integration Considering Demand Side Resources

Power System Stochastic Unit Commitment Model for Largescare...

引用

2019 3rd International Conference on Artificial Intelligence, Automation and Control Technologies (AIACT 2019)

作者： Wenxia Liu Suhua Lou Shuyun Wang Xianggang He Xinfu Song Grid Planning & Research Center Guizhou Power Grid Co.LTD. State Key Laboratory of Advanced Electromagnetic Engineering and Technology(College of Electrical and Electronic Engineering Huazhong University of Science and Technology) Economy and Technology Research Institute of State Grid Xinjiang Electric Power Co. LTD.

As the uncertainty output characteristics of wind power, the large-scale wind power integrated to the grid, has brought new challenges to power system operation. Based on the uncertainty characteristics of wind power, this paper establishes the wind power output model, then focuses on the positive effects of price-based demand response(PDR) and incentive-based demand response(IDR),which are allowed to participate in the power balance, on the unit commitment(UC) with high wind power penetration, and establishes the PDR and IDR models. Based on the chance constrained programming, this paper proposes a stochastic UC model with large-scale wind power integration considering demand side resources(DSR). Stochastic simulation combined with particle swarm optimization(PSO) algorithm was presented to solve this model. At last, the model is proved feasibly and effectively by testing the IEEE 10 machines system.

关键词： IDR Power System Stochastic Unit Commitment Model for Largescare Wind Power Integration Considering Demand Side Resources Model

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Flexible Multi State Switch of Distribution Network Based on Flux Controlled Adjustable Reactor

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Journal of Physics: Conference Series 2020年第1期1659卷

作者： Xiaoliang Tang Fang Yang Yabing Zhou Guangyi Zhang Jie Gong Qingyuan Power Supply Bureau China Southern Power Grid Corporation Qingyuan China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

Flexible Multi-states Switch based on power electronics technology can realize the flexible interconnection between feeders, elastically control feeder power flow and solve the serious unbalance of feeder power flow in the distribution network. To solve the problem, this paper proposes that using flux-controlled variable reactor as the topology of flexible multi-states switch in distribution network. Firstly, flux-controlled variable reactor's principle will be introduced; Then, we analyze the principle of feeder power flow's control using variable reactor; After that, the control strategy for the flexible multi-states switch with different access methods is proposed; At last, a MATLAB simulation model and the prototype experiment platform are built. The results verified the power flow control function of flexible multi-states switch and effectiveness of proposed controlled strategy.

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Wind farm aggregation method based on motion equation concept: a case study

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The Journal of engineering 2018年第13期2017卷 708-713页

作者： Zhichao Cui Xiaoming Yuan Meiqing Zhang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 People's Republic of China

With large number of wind farms integrating into grid, the dynamic behaviour of power system has been impacted significantly. To study the impacts of wind farm on power system, the dynamic modelling of wind farm is important. Compared with modelling all the wind turbines of wind farm in detail, aggregating the wind farm to reduce the complexity of model is a better choice. Several studies have put forward some aggregation methods, such as single-machine representation and multi-machine representation. However, applicability of these methods is limited and they cannot aggregate different types of wind turbines. This study proposes a wind farm aggregation method based on motion equation concept. By defining bus voltage as internal voltage of the aggregation model, the relationship between internal voltage and unbalanced power of wind farm is established. An aggregated model of wind farm in DC-link voltage control timescale is built and time-domain simulation results are presented to verify the feasibility of this model. The aggregation method can aggregate wind turbines regardless of their types and working status. In addition, this aggregation method can be applied to modelling other systems in other timescales based on motion equation concept.

关键词： wind power plants wind turbines voltage control time-domain analysis time-domain simulation DC-link voltage control timescale unbalanced power internal voltage multimachine representation single-machine representation wind turbines dynamic modelling power system dynamic behaviour motion equation concept wind farm aggregation method

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Analytical model of plasma response to external magnetic perturbation in absence of no-slip condition

arXiv

引用

arXiv 2019年

作者： Huang, Wenlong Zhu, Ping School of Computer Science and Technology Anhui University of Technology Ma’anshanAnhui243002 China International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology WuhanHubei430074 China Department of Engineering Physics University of Wisconsin-Madison MadisonWI53706 United States

Recent simulation and experimental results suggest that the magnetic island and flow on resonant surface often do not satisfy the "no-slip" condition in the steady state. A new theory model on nonlinear plasma response to external magnetic perturbation in absence of no-slip condition is proposed. The model is composed of the equations for the evolution of both width and phase of magnetic island due to forced reconnection driven by the external magnetic perturbation, and the force-balance equation for the plasma flow. When the island width is much less than the resistive layer width, the island growth is governed by the linear Hahm-Kulsrud-Taylor solution in presence of time-dependent plasma flow. In the other regime when the island width is much larger than the resistive layer width, the evolution of both island width and phase can be described using the Rutherford theory. The island solution is used to construct the quasi-linear electromagnetic force, which together with viscous one, contributes to the nonlinear variation in plasma flow. The no-slip condition assumed in the conventional error field theory is not imposed here, where the island oscillation frequency depends on but does not necessarily equal to the plasma flow frequency at the rational surface. Copyright © 2019, The Authors. All rights reserved.

关键词： Plasma flow

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Multiband filter: estimator of different frequency components of grid voltage

引用

The Journal of engineering 2018年第13期2017卷 696-701页

作者： Chenhui Huang Xiaoming Yuan Sheng Li State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 People's Republic of China

With the rapid development of renewable energy, an increasing number of power electronic devices is integrated into the power system. Multi-time-scale controllers of these devices bring about diverse oscillations and harmonics which have threatened the stable operation of the power system. The accurate estimation of oscillations becomes the primary task to tackle this problem. This study proposes a novel cross-coupled filter to accurately detect fundamental component and other frequency components. In addition, the transfer function in the frequency domain is given to describe the actual input–output relationship. Furthermore, the harmonic components which are filtered out do not have amplitude changes and phase shifts between the input and the output. Finally, the accuracy of the transfer function is verified by simulation.

关键词： power filters transfer functions frequency-domain analysis power system stability multiband filter frequency component estimator grid voltage renewable energy power electronic devices multitime-scale controllers diverse oscillations power system operation stability cross-coupled filter fundamental component transfer function frequency domain phase shifts

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