Using computational fluid dynamics software FLUENT analysis and calculation the aerodynamic coefficient of the 28mm ice thickness crescent iced quad-bundle conductors under different spacing. Studies show that aerodyn...
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Aiming at the strict environment limit of existing technology and industrial production in the textile industry, a multi-point temperature and humidity monitoring system has been introduced based on the wireless senso...
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In order to solve the RFID authentication protocols, a new mutual authentication protocol based on Hash for the lightweight RFID system is proposed in this paper. Compared with several RFID authentication protocols wi...
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In order to study on the problem of voltage stability of power system, this paper describes the static bifurcation analysis and the dynamic bifurcation analysis in voltage stabilization analysis of power system and it...
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In order to study on the problem of voltage stability of power system, this paper describes the static bifurcation analysis and the dynamic bifurcation analysis in voltage stabilization analysis of power system and its relationship with the voltage stability,discusses the voltage instability caused by two main bifurcation formal definition, the occurrence of the conditions and the calculation of the bifurcation point, and points out advantages and disadvantages of various algorithms. Finally the paper looks forward to further study of the bifurcation theory in terms of voltage stability.
Various fault location methods for distribution network at home and abroad are summarized. According to the fault type,the location methods for short circuit fault and earthed fault are introduced. And the basic theor...
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Various fault location methods for distribution network at home and abroad are summarized. According to the fault type,the location methods for short circuit fault and earthed fault are introduced. And the basic theories, characteristics, improvement and applications of the representative methods are analyzed. The main problems in the applications of these methods are analyzed. In view of these questions, users' requirements and the development of distribution network, the improvement and research about fault location technical are proposed preliminarily.
With the development of modern technology, high quality power supply becomes more desirable in everyday life. Among problems related with the power quality, the most urgent is the voltage dip;with the application of p...
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With the development of modern technology, high quality power supply becomes more desirable in everyday life. Among problems related with the power quality, the most urgent is the voltage dip;with the application of power electronics devices, the power system is polluted by harmonics. SMES(Superconducting Magnet Energy Storage) system can not only compensate the voltage dip, but also provide a load- fluctuation compensation and active power filter. In the paper the main structure of SMES system is introduced;the necessity to use SMES are demonstrated by analyzing the problem of power quality. The analysis shows that SMES system is effective in improving the power quality.
Traditional central power supply and distributed generation have the advantages and limitations themselves Micro grid technology can integrate the advantages of distributed generation and that makes for large scale ne...
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Traditional central power supply and distributed generation have the advantages and limitations themselves Micro grid technology can integrate the advantages of distributed generation and that makes for large scale new energy and renewable energy power generation system connected to the grid First, the micro grid research background and significance are introduced in detail, then the current research situations of micro-grid at home and abroad are represented, in the end, the key problems and development prospect of micro grid are discussed emphatically
Over the past 10 years, nonlinear dynamics and chaotic theory attracted scholars and people got a deeper understanding of chaos. There are many methods for chaos research, and the method of using topological horseshoe...
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Over the past 10 years, nonlinear dynamics and chaotic theory attracted scholars and people got a deeper understanding of chaos. There are many methods for chaos research, and the method of using topological horseshoe is an important branch of those methods. So far, this is one of the core methods with mathematical rigor for chaos research. Based on simple thinking of geometric space, topological horseshoe build a bridge for numerical and theoretical studies of complex behavior of nonlinear systems so that people can carry out a series of studies for chaotic behavior. This paper introduces the basic content of topological horseshoe theory and the application to a simple power system.
After a distribution network failure occurs, how to correctly and quickly restore power supply to non- fault zone is of great significance to meet the user's power supply requirement and to improve power supply re...
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After a distribution network failure occurs, how to correctly and quickly restore power supply to non- fault zone is of great significance to meet the user's power supply requirement and to improve power supply reliability. At first, this paper introduces the research status of service restoration algorithm of distribution network, and then analyzes the advantages and disadvantages of various algorithms. At last, it expounds the problems existing in the current distribution network service restoration and makes prospect of research on the distribution network service restoration.
At present years, the photovoltaic industry has a rapid development The research of related technologies also has made tremendous progress The photovoltaic power generation system includes the solar array, controller,...
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At present years, the photovoltaic industry has a rapid development The research of related technologies also has made tremendous progress The photovoltaic power generation system includes the solar array, controller, batteries, inverter, electricity load, etc In this paper, combining with domestic and foreign research status quo, respectively summarizes four aspects of photovoltaic system technology, the maximum power point tracking, DC converter, inverter and islanding detection
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