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Modeling large reversible electric-field-induced strain in ferroelectric materials using 90° orientation switching

Science China(Technological Sciences) 2009年第1期52卷 141-147页

作者： Roderick V. N. MELNIK Mathematical Modelling and Computational Sciences Wilfrid Laurier University Waterloo 75 University Ave W Canada N2L 3C5

Reversible large electric-field-induced strain caused by reversible orientation switchings in BaTiO3 is modeled using the Landau's theory of phase transition. A triple well free energy function is constructed. Each of its minima is associated with one of the polarization orientations involved. Nonlinear constitu- tive laws accounting for reversible orientation switchings and electrostriction effects are obtained by using thermodynamic equilibrium conditions. Hysteretic dynamics of one-dimensional structures is described by coupled nonlinear differential equations. Double hysteretic loops in the electric and me- chanic fields are both successfully modeled. Giant reversible electrostriction is modeled as a conse-quence of reversible orientation switchings via electro-mechanical couplings. Comparisons with ex-perimental results reported in literatures are presented.

关键词： large electrostriction reversible switchings double hysteresis differential model

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Equal Switching Distribution Method for Multi-Level Cascaded Inverters

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Energy and Power Engineering 2013年第9期5卷 560-569页

作者： Saad Tapuchi Raul Rabinovici Dmitry Baimel Nina Baimel Svetlana Bronstein Department of Computer Science Sapir College Sderot Israel Department of Electrical and Computer Engineering Ben Gurion University Beer Sheva Israel Department of Electrical and Electronics Engineering Shamoon College of Engineering Beer Sheva Israel

The paper proposes a new method of equal switching distribution that can be applied to cascaded multi-level inverters. This method is based on the fact that in the cascaded multilevel inverters, the output phase voltage is the sum of voltage waveforms produced by all cascaded cells. By periodically exchanging cells’ voltage waveforms, the proposed method ensures equal average switchings distribution between all cascaded cells. This method is applied to the 13-level inverter, which consists of three cascaded 5-level H-bridge cells per phase. However, the proposed method can be extended to any desired number of voltage levels and applied to any type of cascaded multi-level inverter. Extensive simulation results of the tested 13-level inverter with the equal switching distribution are presented. Moreover, the proposed method is compared to the standard control approaches and its advantages are shown.

关键词： switchings Cascaded Inverter Multi-Level PWM

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