Fu Zhihong

The simulation research of control modeling for three-phase voltage source SVPWM rectifier

On the basis of Discrete Control Modeling for Three-phase Voltage Source SVPWM Rectifier, the mathematical model of VSR and feed forward decoupling control technique were analyzed, the proposed SVPWM algorithm of matrix format can reduce amount of calculation. Basic SVPWM real-time controlling model was composed of four models including space sector determination model, acting time judgment model of correlation vector, calculation model of switch transit time and PWM model, which were constructed on the basis of high-speed signal processing system VHS-ADC of Lyrtech company in Canada. Focus on the research of system model simulation when change the load. This research demonstrate the validity, high-speed, stability. And this research made a foundation for ht further development of laboratory equipment.

Subzone scheme for RBF meshless method in solving multi-medium boundary value problems

Purpose – The purpose of this paper is to solve the interface discontinuities in radial basis function (RBF) method for multi-medium boundary value problems (BVPs). The discontinuity of the solution derivatives is not easily handled with RBF method because of infinitely smoothness. Design/methodology/approach – The essence of solving BVP is to construct the continuous potential function surfaces. Hence, from constructing surface aspect, this paper proposed and compared the global and subzone schemes for RBF method. Their implementation schemes and mathematic models can then be derived. Numerical experiments and comparison are carried out for electric and magnetic field calculation. Findings – In the numerical experiments, the subzone scheme has shown its significant advantageous, it can approximate not only the potential function but also its derivative on interface boundary with high accuracy. So the physical characteristics of discontinuities on the interface can be revealed clearly. The overall precisi...