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Numerical Estimation of Inter Line Power Flow Controller Based on Injection Model of Synchronous Voltage Sources

Shahriari A., Mokhlis H., Bakar A. H., Karimi M., Illias H. A.

Przegląd Elektrotechniczny

2013

R. 89, nr 3a

121--125

This paper presents the estimation model of Inter-Line Power Flow Controller (IPFC) based on injection model of synchronization voltage source. The linear model of voltage source inverter is used to estimate steady-state operation of Inter-Line Power Flow Controller. The proposed model can keep the capability of IPFC with the acceptable accuracy. The active and reactive power flow at receiving end line could be controlled separately in this proposed model. Furthermore, the proposed model has these abilities to decrease the reactive power flow and control of the sending bus voltage at the same time. The validation of the proposed method is shown by using two machine systems to estimate suitable approximation of power flow at receiving end line.

W artykule opisano model estymacji międzyliniowego regulatora przepływu mocy (ang. IPFC), bazujący na synchronizacji napięć źródłowych. Proponowany model utrzymuje odpowiednią dokładność IPFC. Daje możliwość niezależnej kontroli mocy czynnej i biernej. Model został zweryfikowany z wykorzystaniem dwóch systemów w celu estymacji aproksymacji mocy na końcu linii odbiorczej.

Remarks on numerical estimation of the critical impact velocity in shear

Klosak M., Łodygowski T., Klepaczko J. R.

Computer Assisted Mechanics and Engineering Sciences

2001

Vol. 8, No. 4

579--593

A phenomenon called the Critical Impact Velocity (CIV), which is directly related to material behavior under dynamic loads, is of special interest in this paper. Deformation trapping due to thermoplastic instability caused by the propagation of plastic waves is the main physical reasons for the CIV. This critical value of shear velocity should be considered as a material constant, but it is difficult to estimate due to complicated material response. Analytical approaches may only provide some preliminary estimates, because they are based on simple constitutive relations. On the other hand, experimental techniques are more reliable, but then there exist problems in specimen design. Numerical techniques such as FE method offer a possibility to treat the problem in a more general aspect. Numerical results obtained in the environment of ABAQUS code demonstrate the role to be played by computer simulations as compared to the analytical and experimental findings. The CIV in shear is studied for the case of martensitic steel VAR4340, and the FE models are based on geometry of the Modified Double Shear specimen (MDS). Thus, the principal questions are formulated as follows: to which extent the analytical approach approximate the CIV, what is the role of experimental results and what information can be obtained after numerical simulations.