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Virtual Synchronous Generator Based Current Synchronous Detection Scheme for a Virtual Inertia Emulation in SmartGrids

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energy and Power Engineering 2019年第3期11卷 99-131页

作者： Arvind Parwal Martin Fregelius Dalmo Cardosa Silva Tatiana Potapenko Johannes Hjalmarsson James Kelly Irina Temiz Janaina Goncalves de Oliveira Cecilia Bostrom Mats Leijon Division of Electricity Department of Engineering SciencesUppsala UniversityUppsalaSweden Department of Electrical Engineering Universidade Federal de Juiz de ForaJuiz de ForaBrazil MaREI—Centre for Marine and Renewable energy Ireland University College CorkCorkIreland Department of Electrical Engineering Chalmers University of TechnologyGothenburgSweden

Renewable energy sources, such as photovoltaic wind turbines, and wave power converters, use power converters to connect to the grid which causes a loss in rotational inertia. The attempt to meet the increasing energy demand means that the interest for the integration of renewable energy sources in the existing power system is growing, but such integration poses challenges to the operating stability. Power converters play a major role in the evolution of power system towards SmartGrids, by regulating as virtual synchronous generators. The concept of virtual synchronous generators requires an energy storage system with power converters to emulate virtual inertia similar to the dynamics of traditional synchronous generators. In this paper, a dynamic droop control for the estimation of fundamental reference sources is implemented in the control loop of the converter, including active and reactive power components acting as a mechanical input to the virtual synchronous generator and the virtual excitation controller. An inertia coefficient and a droop coefficient are implemented in the control loop. The proposed controller uses a current synchronous detection scheme to emulate a virtual inertia from the virtual synchronous generators. In this study, a wave energy converter as the power source is used and a power management of virtual synchronous generators to control the frequency deviation and the terminal voltage is implemented. The dynamic control scheme based on a current synchronous detection scheme is presented in detail with a power management control. Finally, we carried out numerical simulations and verified the scheme through the experimental results in a microgrid structure.

关键词： Current Synchronous Detection Dynamic Droop Control energy storage Virtual Inertia Virtual Synchronous Generator

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Prospects for High-quality Development of Water Resources

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Meteorological and Environmental Research 2021年第6期12卷 43-47,52页

作者： Liusheng PENG Anhui Electric Power Construction First Engineering Co. Ltd.China Energy Construction GroupHefei 230088China

The water resources of rivers and reservoirs with a five-meter drop are used to discuss the technical theory and the cost and practical value of equipment *** high-quality development technology of water resources exp... 详细信息

关键词： Flood control Drought resistance energy storage Low-head high-efficiency power generation High-speed water transfer channel Sewage treatment by vertical pipeline pressurization

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Designing an Automatic Control System for the Improved Functioning of a Solar Wall with Phase Change Material (PCM)

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Open Journal of energy Efficiency 2016年第1期5卷 19-29页

作者： Patrick Favier Laurent Zalewski Stephane Lassue Sohail Anwar IUT Bethune Université d’ Artois Arras France LGCgE Laboratory Université d’ Artois Arras France Department of Engineering Altoona College Pennsylvania State University Altoona PA USA

Solar walls constitute an important green architectural feature that positively contributes to energy saving in buildings. Different configurations may be proposed, such as, solar wall with Phase Change Material (PCM), composite solar wall, photovoltaic solar wall, zigzag solar wall, and solar hybrid wall. Being environmentally friendly, these passive solar components can provide thermal comfort and help save energy. Their disadvantages include principally unpredictable heat transfer, heat losses by night for some systems or inverse thermo-siphon phenomenon. Appropriate energy management techniques can be used to control and optimize the performances of solar walls. An experimental study for energy management of a PCM based solar wall is described in this paper. The experimental results show the effectiveness of the proposed automatic control system in regulating the capture of solar energy.

关键词： Solar Walls Solar energy energy storage Phase Change Material energy Management

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A Centralized energy Coordinator Reliant on BESS and DER-PV Operation

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Journal of Power and energy Engineering 2016年第8期4卷 49-58页

作者： Joseph M. Lavalliere Elham B. Makram Holcombe Department of Electrical and Computer Engineering Clemson University Clemson USA

Many existing battery energy storage system (BESS) control schemes focus on mitigating negative impacts resulting from the operation of distributed energy resources-photovoltaic facilities (DER-PV). These include out-of-firm conditions from reverse power flow or extreme variability in the service voltage. Existing control strategies fail to consider how BESS control schemes need to operate in a consecutive day-to-day basis in order for them to be implemented in the field. In this paper, a novel energy management algorithm capable of dispatching a BESS unit upstream of a multi-megawatt DER-PV is introduced. This algorithm referenced as the Master energy Coordinator (MEC), accepts forecasted DER-PV generation and individual feeder load to create daily charge and discharge rate schedules. Logic is integrated to the cyclic discharging event to sync with the forecasted peak load, even when it will occur during the morning of the next day. To verify the MEC operation, Quasi-Static Time Series (QSTS) simulations are conducted on a 12.47 kV distribution feeder model utilizing historical head-of-feeder and DER-PV analog DSCADA measurements.

关键词： energy storage energy Dispatch Strategy Solar Photovoltic Generation Smart Grid

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Performance of redox flow battery systems in Japan

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储能科学与技术 2013年第3期2卷 233-236页

作者： Shibata Toshikazu Kumamoto Takahiro Nagaoko Yoshiyuki Kawase Kazunori Yano Keiji Sumitomo Electric Industries Ltd.1-1-3 ShimayaKonohana-kuOska 554-0024Japan

Renewable energies, such as solar and wind power, are increasingly being introduced as alternative energy sources on a glosbal scale toward a low-carbon society. For the next generation power network, which uses a large number of these distributed power generation sources, energy storage technologies will be indispensable. Among these technologies, battery energy storage technology is considered to be most viable. Sumitomo Electric Industries, Ltd. has developed a redox flow battery system suitable for large scale energy storage, and carried out several demonstration projects on the stabilization of renewable energy output using the redox flow battery system. This paper describes the advantages of the redox flow battery and reviews the demonstration projects.

关键词： redox flow battery energy storage renewable energy smart grid wind turbine photovoltaics

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Numerical Simulation and Analysis Of PCM on Phase Change Process Consider Natural Convection Influence

Numerical Simulation and Analysis Of PCM on Phase Change Pro...

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2012年计算机应用与系统建模国际会议

作者： Lin Qiu Min Yan Zhi Tan Beijing University of Civil Engineering and Architecture

A phenomenon of heat energy storage and release in phase change materials (PCM) which used in building retaining structure has been investigated. In the reality process of phase change, liquid phase has two ways of heat exchange: pure heat conduction and natural convection. To analyze the reality melting and solidification of PCM , set up the PCM heat transfer model which considering liquid-phase natural convection in this paper and exploit CFD software to carry out numerical simulation. The result shows that the influence of natural convection has mainly something about circumfluence generated by liquid phase, the direction of circumfluence which is opposite when heat and cool, the circumfluence intensity enhances as the height of phase interface increase.

关键词： energy storage Phase change materials Natural convection Numerical simulation.

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Medium power wind mill control for stand alone energy generation

Medium power wind mill control for stand alone energy genera...

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2009 IEEE 6th International Power Electronics and Motion Control Conference-ECCE Asia

作者： O. BA *** P. Ndiaye A. Berthon CIFRES University of Dakar FEMTO-ST laboratory University of Technology of Belfort-Montbeliard FEMTO-ST laboratory University of Franche-Comte

This paper will propose the study of a the control of a coupled wind turbine to a stand alone electric generator based on other renewable energies and storage systems In this study a new method has been investigated to design the Maximum Power Point tracking （MPPT） in order to have a good efficiency with a simple approach. From the wind mill characteristics, in particular its power rate, we propose to drive the wind mill at optimal power by a dichotomy algorithm in association with the vector control of the asynchronous generator. Simulation results will be confronted to published results, issued from method developed by different authors. A test bench has also been carried out at reduced scale. The test bench will use a DSP （Digital Signal Processor） board on which the new algorithm has been implemented. Software development has been carried out using Matlab-Simulink environment.

关键词： Wind energy generation Wind power generation Milling machines Power generation Signal processing algorithms Testing Control systems Wind turbines Generators energy storage

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Atomic Layer Deposition Al2O3@Transition Metal Vanadate/CNTs Composite as Electrodes for Potassium-Ion Batteries

Atomic Layer Deposition Al2O3@Transition Metal Vanadate/CNTs...

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中国化学会第十届全国无机化学学术会议

作者： Wei Dai Yanguang Gu Liang Liu Automotive Engineering Research Institute Jiangsu University

Potassium ion battery (PIBs) has become a new generation of secondary battery in recent years due to its abundant potassium resources,low cost and great application *** main challenge faced by PIBs are the lack of high-capacity electrodes to conduct reversible detaching of large size potassium *** the same time,in the process of potassium storage reaction,the surface of electrodes absorb insufficient potassium ions and the reaction kinetics is slow,resulting in its low reversible capacity and unstable cycling *** intend to develop a multi-electron reaction PIBs electrodes based on the metal REDOX both of vanadium and transition metal reduction in the transition metal *** multi-electron reaction based electrodes can efficiently improve the capacity of ***,an ultra-thin electron-insulating layer (AlO) is deposited by atomic layer deposition (ALD) on the surface of the electrodes by passivate the surface of the composite electrodes,with the aim of blocking the electron transfer pathway and alleviating amorphous *** further introduce the carbon nanotubes (CNTs) as composite electrodes to further improve the performance of the transition metal vanadate *** micron-pillars of CoVO/CNTs composite are successfully synthesized as shown in Figure 1 *** anode for the PIBs in Figure 1 right,the pristine micron-pillars of CoVO/CNTs composite exhibit 218 mAh g (the first discharge capacity is excluded).The optimal thickness of 1 nm AlO (about 0.1 nm per cycle) coated on composite shows increased capacity of 319 mAh g,while the 5 nm AlO coated samples shows decreased capacity of 210 mAh *** 50 cycle of discharge and charge process,the composite anode with 1 nm AlOALD shows the highest capacity of 91 mAh g vs.10 mAh gfor 0 nm and 46 mAh gfor 50 nm ALD *** is still in the early stage of development,and it is hoped that the research results of this project can provide new research ideas for the developme

关键词： multi-electron reaction transition metal vanadates atomic layer deposition potassium-ion battery energy storage

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Design of household light storage inverter system

Design of household light storage inverter system

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第32届中国过程控制会议(CPCC2021)

作者： Laba dunzhu Wu Kaibin State Grid Electric Power Research Institute Co.Ltd

In this paper,we mainly research and design the household optical storage inverter system,aiming at the three parts of the system,photovoltaic power generation,battery energy storage(energy release) and inverter(rectify).The photovoltaic side uses the boost circuit to realize the voltage rise,and the battery side uses the buck boost circuit to realize the storage and release of *** the middle of load and bus,single-phase full bridge inverter is used to invert the *** research content of this paper is of great significance for the development and utilization of household electricity and new ***,Matlab/Simulink is used to build the system model,and the final simulation results prove the correctness of the design parameters.

关键词： Photovoltaic energy storage Buck-Boost circuit

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Prediction-free Online Dispatch of Remote Wind-storage Plant Considering Transmission Congestion

Prediction-free Online Dispatch of Remote Wind-Storage Plant...

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第40届中国控制会议

作者： Tengyun Qi Zhongjie Guo Jianping Liu Wei Wei Fei Xu1Shengwei Mei State Key Laboratory of Power Systems Department of Electrical EngineeringTsinghua University China Three Gorges Corporation China Three Gorges Renewables (Group) Co. Ltd.

Large-scale renewable energy generations rapidly develop in recent decades;however, the inherent uncertainty of renewable resources, as well as the insufficiency of transmission corridors, injures the operating economy of renewable *** storage is considered as a promising support in favor of exploiting the profitability of renewable energy *** paper investigates the real-time operation of a wind-storage system with the aim of profits maximization. energy storage plays a role in shifting energy to improve the electricity sale incomes and reduce the curtailment cost in a transmission capacity-constrained and time-of-use price environment. Unlike other forecast-based rolling optimization methods, we employ the Lyapunov optimization theory to relax the time-coupling constraints of energy storage and achieve prediction-free online scheduling. The deduction based on Lyapunov optimization theory is given;the lemma that determines the critical penalty coefficient in the drift-plus-penalty problem is proved. In the online stage, it entails solving a small-scale mixed-integer linear program to obtain the scheduling strategy. The statistical optimality gap can be easily estimated. Case studies on a designed wind-storage system validate the performance of the proposed method.

关键词： Wind renewable energy storage uncertainty online scheduling Lyapunov optimization

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