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An offline optimal flexible load transfer strategy of more electric aircraft including operation mode and fault location of variable frequency starter generator is proposed, whose key innovation is to quantify variable operational safety margin using node voltage flexibility. Firstly, a series of scenes that show the fluctuation of load in different operation mode are generated through the Monte Carlo...
G3-PLC technology is the new generation technical specification, which has many advantages such as low rate, high reliability and strong anti-interference ability etc. But due to the operating frequency limit, communication failure phenomenon often occurs when being applied to complex medium voltage distribution networks, which cannot guarantee a high reliable communication. Hence a new generation...
This paper proposes a comprehensive simulation model for the Electrical Power System (EPS) of More Electrical Aircrafts (MEA). Taking the presently typical MEA model of Boeing 787 as an example, the integrated structure of EPS is firstly illustrated and the operating principles are theorized. The key components of the MEA EPS including generators, rectifiers, loads, breakers, control devices, cables...
Power system short term load forecasting is very sensitive to the disturbance factors in the day load, which could not obtain the desired optimal results. In order to solve such problems, this paper proposes sectional simulation forecasting method. This paper takes a certain area as an example and demonstrates sectional simulation forecasting method by analyzing the characteristics from daily load...
We study (symbol-pair) codes for symbol-pair read channels introduced recently by Cassuto and Blaum (2010). A Singleton-type bound on symbol-pair codes is established and infinite families of optimal symbol-pair codes are constructed. These codes are maximum distance separable (MDS) in the sense that they meet the Singleton-type bound. In contrast to classical codes, where all known q-ary MDS codes...
The use of multiple frequency shift keying modulation with permutation codes addresses the problem of permanent narrowband noise disturbance in a power line communications (PLC) system. Equitable symbol weight codes was recently demonstrated to optimize the performance against narrowband noise in a general coded modulation scheme. This paper establishes the first infinite family of optimal equitable...
Qualitative analysis and quantitative analysis are combined to carry on hydraulic variable pitch system fault diagnosis of wind turbine. Fault tree model of hydraulic system is established by the analysis of hydraulic system fault symptoms set. Petri net model of hydraulic system fault can be obtained by fault tree using the matrix operations of Petri net to achieve the conversion from qualitative...
Because of energy shortage, environment pollution is serious day by day. Various countries are trying to find a kind of energy use with little environmental pollution and high utilization rate. Distributed generation overcomes many weaknesses of traditional centralized power supply with the advantages of less environmental pollution, high energy utilization rate, reliability and flexibility etc, attracts...
The use of multiple frequency shift keying modulation with permutation codes addresses the problem of permanent narrowband noise disturbance in a power line communications system. In this paper, we extend this coded modulation scheme based on permutation codes to general codes and introduce an additional new parameter that helps to more precisely capture a code's performance against permanent narrowband...
Novel durian-like nanostructures, composed of Fe3O4 “durian core” and TiO2 “durian thorns”, have been successfully prepared by combining a simple solvent-thermal route and post-temperature treatment. Especially, the TiO2 thorns-like structure could be grown on the Fe3O4 microspheres by the post-temperature treatment. The surface morphology can be changed from core-shell structure to durian-like structure...
A short-term wind speed prediction method based on time series combined with LS-SVM is proposed in this paper according to the characteristic of wind speed. The original wind speed signals are decomposed into high frequency part and low frequency part by wavelet decomposition and reconstruction. ARMA model is constructed to predict the wind speed values of high frequency part which can be regarded...
This paper puts forward n method of Chinese predicate recognition based on the features study. And according to the sentence's predicate center coming out of features, we obtain the characteristic knowledge of the predicate based on the language bank of artificial welled marks, and make use of characteristic knowledge to identify predicate. Finally, In the open test the accuracy rate of Chinese predicate...
PDF was first introduced by Ding and Yin and used to construct optimal constant composition codes (CCCs). In this paper, a new class of PDF is established, based on the known Weil Theorem.
Constant composition codes (CCCs), a generalization of constant weight binary codes, have attracted lots of interests due to their numerous applications. It is known that there exists a one to one correspondence between constant composition codes (CCCs) and generalized doubly resolvable packings (GDRPs). In this paper, some new upper bounds are presented and several new series of optimal constant...
To increase the efficiency of data mining is the research emphasis in this field at present. Through the establishment of transaction-item association matrix, this paper changes the process of association rule mining to elementary matrix operation, which makes the process of data mining clear and simple. Compared with algorithms like Apriori, this method avoids the demerit of traversing the database...
Language is the main carrier of social information. In order to make use of the information existing in the form of natural language, we should extract and analyze it with the technique of dealing with natural language. In dealing with natural language, syntax analysis which is of vital importance should be the bridge between grammar analysis and semantic analysis. Based on rule and statistical approach,...
Equilibrium is the optimum operational condition for the power market by economics rule. Whereas the spot power market cannot generally achieve the equilibrium due to existing network losses and congestion. The impact of the network losses and congestion on spot power market is analyzed in order to newly establish the equilibrium model under considering the network topology. At the end, the OPF is...
The nodal and loop equations of electric power network are established relied on the equivalent pi circuit where the load is considered as voltage source and the impedance branch is considered as the link and ground branch is considered as the tree branch in order to perform the hybrid analysis method for power flow calculation in this paper. Moreover, the problems about the node and loop degradation...
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