International Journal of Automation and Control Engineering

Control of Power Transformer Windings during Electrodynamic Test Using High-Voltage Thyristor Valve for Regulation the Angle of the Initial Inclusion

2015-10

Control of Power Transformer Windings during Electrodynamic Test Using High-Voltage Thyristor Valve for Regulation the Angle of the Initial Inclusion

Pages 58-66
Author Alexander Yu. KhrennikovAlexei Kuvshinov A.Vladimir Mazurov O.AlexeiNesterchuk K
Abstract Authors consider principles of construction and functioning of high-voltage thyristor valve when carrying out electrodynamic test of power transformers. A procedure of structure determining of high-voltage thyristor valve which provides safety of carrying out short-circuit experiments for power thyristor has been developed. The authors show that high-voltage thyristor valve rules out the possibility of occurrence of abnormal and no normalized modes for potential transformer during short-circuit experiments.

2015-10

Analytical Expression for the Hydrodynamic Fluid Flow through a Porous Medium

Pages 67-76
Author Ananthaswamy VembuUma Maheswari Shanmuga
Abstract In this research article the effect of variable viscosity on the temporal development of small disturbances in a pressure-driven fluid flow through a channel saturated with porous medium is investigated. The approximate analytical solution of the second order boundary value problem for the dimensionless velocity is derived by using the Homotopy analysis method. This method can be easily extended to solve the non-liner initial and boundary value problems in physical, chemical in engineering and sciences.

2015-10

A New Approach to the Indefinite LQ Optimal Control for a Kind of Stochastic Bilinear System with Control Dependent Noises

Pages 77-82
Author Xing Guojin
Abstract This article discusses the indefinite LQ optimal state feedback control problem for a kind of stochastic bilinear system with control dependent noises. First, a backward dual system in Krein space of the original system is constructed, and the dual theorem between the original indefinite LQ problem and a backward stochastic filtering problem is obtained. Then, the stationary point of the control and the condition for the stationary point to be the minimum are derived.