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The article describes the factor model of Tomsk region schools functioning which was developed and investigated using the STATISTICA system. The constructed model describes an impact of different variables (context factors) on educational results of Tomsk school graduates. At the preliminary stage the most significant variables were determined, the exploratory data analysis was made using the method...
In this paper, a model of the wind turbine (WT) with direct-drive permanent magnet generator (DDPMG) and its associated controllers is presented, based on which the small signal stability analysis model is derived. As detailed models of wind farm can place and unbearable computational burden on simulations programs, there is a need to reduce wind farm order dimension. Focusing on the most relevant...
In this paper the analysis of small signal stability of grid-connected doubly fed induction generators (DFIG) is presented. The detailed model of grid-connected DFIG wind turbine is firstly established, and the eigenvalues are classified and characterized based on participation factors. Then the modal analysis including its converter and pitch controllers is studied, and model simplification of the...
The paper focuses on a spatial rotation three Degree of Freedom (DOF) 4-SPS-S parallel robot mechanism, which has four SPS Active Legs and one passive constraining leg. The geometric model of the parallel robot mechanism is introduced, and then velocity mapping equation and Jacobian matrix for the robot mechanism are developed. Based on principle of virtual work and sub-structure synthesis method,...
In this paper, an approach for estimating the number of emitters from a set of interleaved pulses trains is proposed. The approach is based on the application of information theoretic criterion, which is formulated by using a new model of eigenvalues from principal component analysis (PCA) of pulse envelope vectors. In this model, the logarithm likelihood function is obtained by clustering the eigenvalues...
This paper analyses harmonic resonance of the system with branches containing independent constant voltage source. Harmonic resonance often manifests as high voltages in a power system. It was found that such resonance phenomenon is associated with the singularity of the network admittance matrix. The singularity, in turn, is due to the fact that one of the eigenvalues of the matrix approaches zero...
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