An Enhanced Predictive Current Control Scheme for Common Mode Voltage Alleviation and Improvement of Torque Response of PMSM Drive

Abstract

Predictive current control (PCC) is an effective control scheme with provisions to handle multiple objectives and nonlinear constraints. In the conventional PCC (CPCC) scheme, the application of a zero-voltage vector (ZVV) leads to the generation of large common-mode voltage (CMV), which gradually leads to bearing damage. However, disregarding ZVV can suppress CMV at the expense of large distortions in stator current. To avoid this, the present work deploys synthesized voltage vectors (SVVs) obtained from adjacent active vectors (AAVs) for permanent magnet synchronous motor (PMSM) drive control. In this article, two techniques are proposed for alleviating the CMV. Two AAVs are applied for a fixed duration in the first proposed method. Thus, the effect of neglection of ZVV can be circumvented with the application of two AAVs. In the second method, multivectors are applied to ensure CMV suppression and improvement of the steady-state torque response. Furthermore, an effective voltage vector (VV) preselection scheme using the complex-plane concept is introduced. Unlike the conventional CMV reduction schemes, the proposed VV-preselection evades tangent inverse angle determination and complex transformations. This offers the advantage of reduced computational burden with improved steady-state torque performance. The effectiveness of the proposed schemes is validated by comparing them with CPCC and existing literature.