A Novel Direct Torque Control of Matrix Converter-Fed PMSM Drives Using Dynamic Sector Boundary for Common-Mode Voltage Minimization

In this article, a novel direct torque control (DTC) using dynamic sector boundary is proposed for a matrix converter (MC) fed permanent magnet synchronous motor drive system in order to minimize common-mode voltage (CMV) of the system, based on the fact that rotating vectors produce zero CMV. According to the feature of rotating vectors that their relative position varies with the varying of the phase of input voltage, the vector plane is divided into sectors with dynamic boundaries, and the rotating vectors are redenoted dynamically. A novel switching table and a mapping table of rotating vectors are established according to the control effects of each rotating vector in each sector, and DTC with only rotating vectors is achieved. Experiments with a 2-kW prototype are carried out. The results show that adequate dynamic performance and considerable CMV reduction is achieved by using the novel MC-DTC.