TAILIEUCHUNG - Generalized Vectorial Formalism – based multiphase series-connected motors control

This paper presents the Generalized Vectorial Formalism (GVF) theory to control multiphase series-connected permanent magnet synchronous motors (PMSM) fed by one voltage source inverter (VSI). Based on a decomposition of multiphase machine, a proposed control strategy has been achieved. | SCIENCE & TECHNOLOGY DEVELOPMENT, , - 2015 Generalized Vectorial Formalism – based multiphase series-connected motors control Eric Semail Ngac Ky Nguyen Xavier Kestelyn Tiago Dos Santos Moraes L2EP Laboratory, Arts et Métiers ParisTech, France (Manuscript Received on July 15, 2015, Manuscript Revised August 30, 2015) ABSTRACT Multiphase drives are more and more used in specific applications leading to a necessity of control strategy development. This paper presents the Generalized Vectorial Formalism (GVF) theory to control multiphase series-connected permanent magnet synchronous motors (PMSM) fed by one voltage source inverter (VSI). Based on a decomposition of multiphase machine, a proposed control strategy has been achieved. Some experimental results are given to illustrate this control method. Keywords: Multiphase drives, Generalized Vectorial Formalism, Multiphase seriesconnected machines. 1. INTRODUCTION Higher reliability of classical 3-phase drives can be achieved by oversizing the convertermachine set but this solution increases the cost of the whole system. Even if this oversizing is chosen, in case of an open circuit fault appears in one or two phases of the drive, the system cannot ensure a functioning even at reduced power. Using multiphase drives instead of threephase drives, makes possible to increase the power density, fault-tolerance capability and to reduce torque pulsations at low frequencies [1, 2]. In fault mode, this kind of drives is able to work at a reduced power with satisfactory performances. This aspect is very important in systems which are designed for specific applications, such as offshore energy harvesting or electrical vehicles. Trang 18 The multiphase theory has been developed since 10 years ago [3]-[6] in objective to understand deeply and allow using simple regulators for current and speed. Based on this theory, a multiphase machine can be decomposited to some equivalent fictitious .

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