Modulation Strategy to Reduce Common-Mode Voltage for Three-to-Five Phase Indirect Matrix Converter - Intelligent Computing for Sustainable Energy and Environment - page 28

Modulation Strategy to Reduce Common-Mode
Voltage for Three-to-Five Phase Indirect Matrix
Converter
Hongchen Liu, Hailong Yu, and Lishan Sun
School of Electrical Engineering and Automation, Harbin Institute of Technology,
Harbin, HLJ 150001, P.R. China
{ fenmiao,sunlishan } @hit.edu.cn , yu [e-mail]
Abstract. Based on the analysis of the space vector pulse modula-
tion (SVPWM) using four nearest space vectors, this paper put forward
the improved algorithm to reduce the common-mode voltage of the five
phase indirect matrix converter. The algorithm can effectively reduce the
common- mode voltage by resetting the zero vectors positions. When the
modulation ratio is between 0 and 1.0514, harmonic in output voltage
could be restricted to zero by eliminating the voltage vectors in har-
monic space. Simulation results are shown to verify the effectiveness of
the proposed methods.
Keywords: multi-phase, TSMC, common-mode voltage.
1 Introduction
Recently, multi-phase drive systems have received much more attention due to
their potential value in high power drives. Compared with traditional three-
phase machines, the multi-phase machines have some advantages such as the
reduced amplitude, the increased frequency of torque pulsations, the reduction
of the stator current per phase, the improved torque per ampere, power density
of the electric machine, and fault tolerance. Detail reviews on the development
in the area of multi-phase motor drive are presented in [1]-[5]. Since multi-phase
drive system has gained popularity, a need is felt to develop power electronic
converter to supply such multi-phase systems.
Matrix converter is a direct ac-ac power converter employing bidirectional
switches. In addition to its basic capacity to provide variable sinusoidal voltages
to the load, a matrix converter has several attractive features: bidirectional power
flow, high reliability and long life due to the absence of the capacitor, unity input
power factor at the power supply side [6]-[8] .The two-stage matrix converter
(TSMC) is a novel matrix converter composing of rectifier stage and inverter
stage. This technology provides simplified switch commutation requirements and
modulation strategy. However, the two-stage matrix converter will produce the
common-mode voltage (CMV)at work. Leakage current that flows through a
parasitic capacitor between stator core and stator winding can reduce the life