Control of an open-end winding induction machine via a two-output indirect matrix converter Javier Riedemann, Rubén Peña Electrical Engineering Department University of Concepción Concepción, Chile jriedemann, rupena@udec.cl Roberto Cárdenas Electrical Engineering Department University of Chile, Santiago, Chile rcd@ieee.org Marco Rivera Department of Industrial Technologies Universidad de Talca Curicó, Chile marcoriv@utalca Ramón Blasco-Gimenez Systems Engineering and Control Department Technical University of Valencia Valencia, Spain rblasco2@upvnet.upv.es  Jon Clare, Pat Wheeler School of Electrical and Electronic Engineering University of Nottingham Nottingham, U.K. jon.clare, pat.wheeler @nottingham.ac.uk Abstract—In this paper an Indirect Matrix Converter (IMC) with two output stages feeding an open-end winding induction machine is presented. The IMC has the advantageof having nobulky energy storage elements and with the two output stages up to 1.5 times the input phase voltage can be obtained across the windings of the machine, without overmodulation. A vector control scheme for the machine currents is used along with a modulation strategy for the converter two-output stages to reduce the common mode voltage and compensate the phase zero sequence currents. Simulation results showing the performance of the controlscheme and the reduction of zero sequence and common mode voltages are presented and discussed. Keywords—Open-end winding induction motor drive;matrix converter; vector control; common mode voltage. I. INTRODUCTION Conventional Pulse Width Modulation (PWM) inverters are known to generate switching common mode voltages at the machine terminals which causes the circulation of bearing currents [1]. In last years, dual-inverter systems feeding open- end winding induction motor drives have gained interest because reduced common mode voltage can be achieved by using an appropriate modulation strategy. However, the dual inverter topology could cause the circulation of a zero sequence current in the machine [2] because of the zero sequence voltage across the phase load.This zero sequence current could be of large amplitude because of the low impedance of the load. Different methods can be used to address these problems, for instance employing extra hardware or special modulation strategies [3-4]. Special types of converters are the direct-link converters, or matrix converters, which have the advantages of having no energy storage elements and bidirectional power flow capability with low input and output distortion current and small size input filters. These converters can be used to supply energy to open-end winding ac machines. It has been shown that up to 1.5 times the input phase voltage can be obtained to supply each machine phase winding [4]. As shown in this paper, an Indirect Matrix Converter (IMCs) with two output stages can also be used to supply energy to an open-end winding induction machine. The machine is vector controlled and a PWM strategy, an extension of [5], is used to reduce the zero sequence current by decreasing the average zero sequence voltage. The scheme uses only voltage vector combinations which not produce common mode voltage at the machine terminals [6]. The entire system is modeled using a PSIM platform and results are presented for step changes in dq axis currents, showing the performance of the vector control proposed for the machine and the zero sequence and common mode voltage reduction. II. TWO OUTPUT STAGES INDIRECT MATRIX CONVERTER The circuit configuration of the two output stages indirect matrix converter topology is shown in Fig. 1. The input stage has an active rectifier consisting of six bidirectional switches. This rectifier is modulated to obtain a positive maximum DC link voltage and operates with unity displacement power factor at the input. The output of the IMC consists of two two-level voltage source inverters (VSI). Each inverter can produce eight space voltage vector locations independent of the other, resulting in a total of 64 voltage vector combinations. The open-end winding induction machine is connected between the two VSI outputs. 978-1-4799-2325-0/14/$31.00 ©2014 IEEE 1537