Papers by Keyword: Energy Storage

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Authors: Eduardo Saito, Vagner Eduardo Caetano, Erica Freire Antunes, Anderson Oliveira Lobo, Fernanda Roberto Marciano, Vladimir Jesus Trava-Airoldi, Evaldo José Corat
Abstract: Carbon nanotubes (CNT) are a material with unique properties (mechanical, electrical, electrochemical, etc) allied with low density and high specific area. The present paper studied the electrochemical properties of carbon nanotubes growth by Chemical Vapor Depostion (CVD) technique. The samples were characterized by SEM, Raman Spectroscopy and the double layer capacitance of the powders was evaluated in a Teflon capacitor system with a Ag/AgCl (3M) as reference electrode. The catalyst remotion is provided in Hydrochloric acid washing and the wet oxidative treatments promotes the CNT oxidation and increase the pseudocapacitive response.
Authors: Tayara Correia Gonsalves, Franks Martins Silva, Ligia Silverio Vieira, Julio Cesar Serafim Casini, Rubens Nunes de Faria
Abstract: In recent years, extensive investigations have focused on the study and improvement of supercapacitor electrode materials. The electric devices produced with these materials are used to store energy over time periods ranging from seconds to several days. The main factor that determines the energy storage period of a supercapacitor is its self-discharge rate, i.e., the gradual decrease in electric potential that occurs when the supercapacitor terminals are not connected to either a charging circuit or electric load. Self-discharge is attenuated at lower temperatures, resulting in an increased energy storage period. This paper addresses the temperature-dependence of self-discharge via a systematic study of supercapacitors with nominal capacitances of 1.0 and 10.0 F at DC potentials of 5.5 and 2.7 V, respectively. The specific capacitances, internal resistances, and self-discharge characteristics of commercial activated carbon electrode supercapacitors were investigated. Using cyclic voltammetry, the specific capacitances were determined to be 44.4 and 66.7 Fg1 for distinct carbon electrode supercapacitors. The self-discharge characteristics were investigated at both room temperature and close to the freezing point. The internal resistances of the supercapacitors were calculated using the discharge curves at room temperature. The microstructures of the electrode materials were determined using scanning electron microscopy.
Authors: Guo Peng Zhou, Shi Jie Cheng, Jin Hua Huang, Di Liu
Abstract: A simple interconnected power system with periodic load disturbance is considered, an energy storage based adaptive controller is proposed to output tracking and disturbance completely rejection for the system. Since the periodic load disturbance is uncertain with both amplitude and frequency, by constructing a new exosystem, the output tracking and disturbance rejection problem is solved with output regulation theory. By designing an internal model for the complicated system and introducing an appropriate transformation, the output regulation problem is changed into the stabilization problem of a new augmented system. With the help of adaptive control technique, the designed dynamic energy storage controller can solve stabilization problem of the augmented systems as well as the output tracking and disturbance rejection problem for the original system. Finally, the simulation results show the effectiveness of the proposed control strategy.
Authors: Xiao Dong Wang, Jin Hua Zhu, Ying Ming Liu, Hong Fang Xie
Abstract: With the increase in wind power generation and network capacity, Wind farm power fluctuations on the grid greatly. In order to improve the operational stability of wind farm grid, at its outlet to increase the energy storage system for the new environmentally friendly vanadium redox flow battery (VRB) to effectively regulate the grid power. According to the VRB equivalent mathematical model using a bidirectional DC/AC converter as VRB storage system power regulator, the corresponding charge discharge control and energy management strategy are designed , and grid-connected wind farm system with VRB energy storage unit are modeled and simulated. Simulation results show that the fluctuations in wind speed Circumstances, the VRB energy storage system can quickly and effectively smooth the fluctuations of the active power of the wind farm output, and can provide reactive support to the grid, effectively improve the operating performance of wind farm.
Authors: Ying Jian Chen
Abstract: In this paper,we first discuss the purpose as well as the main types of energy storage,then some advantages of utilizing the thermal and electrical energy storage are reviewed with emphasizing their vital role in promoting the large-scale utilization of renewable energy. Finally,some future R&D demands are pointed out.
Authors: Yang Yang Zhao, Ji Wen Xu, Chang Rong Zhou, Chang Lai Yuan, Qing Ning Li, Guo Hua Chen, Ling Yang
Abstract: The [Bi0.5(Na0.82K0.18)0.5]1-xLaxTi1-yZryO3 (BNKLZT) energy storage ceramics were prepared by conventional solid-state reaction method. Structure, surface morphology, dielectric, ferroelectric and energy storage properties of the BNKLBZT ceramics were investigated. The BNKLZT ceramics showed perovskite, homogeneous and dense structure. Grain size was coarsened by Zr doping, and refined by La doping. Low remnant polarization (Pr) and coercive field (Ec), slim P-E loops were obtained by introducing La and Zr dopants. The optimum energy storage property was obtained for the composition of La=0.03 and Zr=0.03, with energy storage density of 0.84 J/cm3 at 80 kV/cm.
Authors: H. Misran, F.A.M. Zini, Musdalilah Ahmad Salim, Ramesh Singh
Abstract: Mesoporous γ-alumina with relatively high surface area of ca. 590 m2/g and pore size of ca. 2.0 nm to ca. 9.7 nm were successfully processed using facile and cost-effective method in the presence of renewable, low-cost templates. Controlled addition of water during the processing of the materials was found to control the rapid hydrolysis rate of alumina precursors resulting in mesoporous formation. In addition, these materials porosity was made up from framework porosity as well as textural porosity given rise from the aggregations of γ-alumina nanoparticulates. Regardless of the materials specific surface area value, the competitive adsorption amount of energy gas in 68 % humidity environment increased as relative crystallinity of the materials increased.
Authors: Qing You Yan, Xin Yan, Si Qi He
Abstract: Now, the wind power in China develops quite rapidly and the installation of wind power is accounting more and more in power generating installation. Wind power, as a typical kind of renewable energy, is intermittent and unstable so that causes concerns about the damage it may do to power grid when integrate the large-scale wind power. According to that, integration is the main restraint for China to develop wind power. Energy storage, as an emerging technology, has been applied, tested and operated for a few years. It can solve integration problem efficiently and improve the efficiency of wind power integrating with the power grid. Hence, there is a large demand of energy storage on the wind power market. This paper chose grey forecast method to predict the installation of wind power in the near future. Then based on the forecast result, this paper selected low, medium and high rate of energy storage for the wind power system, and finally it predicted the demand of energy storage in the wind power integration from 2012~2015. This paper provided quantitative number and made it possible to plan further development.
Authors: Yun Fu Liu, Zhao Hua Jiang, Guo Hui Yuan
Abstract: Graphene-metal oxide composites as supercapacitor electrodes combine the large pseudocapacitance of metal oxides with the fascinating electrical and mechanical properties and large surface area of graphene. The synthetic methods for composites are reviewed, including in-siu synthesis, solution mixing, hydrothermal method, microware irradiation and electrochemical deposition. Among these techniques, the hydrothermal method offers an effective and simple way to anchor metal oxides on the 2D graphene sheet uniformly. Consequently, the composites exhibit high capacity, high rate capability and well reversibility, presenting promising prospects as supercapacitor electrode material.
Authors: Wen Bo Hao, Lei Lei Zhao, Bing Liang Xu, Cheng Zhi Sun, Zhi Gang Zhao, Cheng Rui Lei, Guo Rui Ren, Jie Wan, Yu Feng Guo
Abstract: As large scale integration of wind power generation into grid, the fluctuation of wind power must be stabilized with fast response complementary power source such as gas and oil power generation. However entire power system is dominated by thermal power plant in China, moreover the proportion of heating units is more and more high. Therefore, expanding the peak regulating capacity of heating units to take in wind power on a large-scale is an inevitable choice. This research proposed the heat load and wind power forecast approach, meanwhile, the analysis strategy of forecasting uncertainty is also be put forward. Then, a thermal electricity combined (TEC) operation technology, which based on making the best use of the heat transfer and thermal storage characteristics of heating network and electric heating, is proposed in this paper to enhance the utilization of wind power. Final, a practical system block diagram is proposed for practical application.
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