Capacitor Current Reduction of Double Three Phase PMSM Drive System by Real-time MPC

This paper proposes a capacitor current reduction method using real-time model predictive control (MPC) for a double three-phase permanent magnet synchronous motor (DTPPMSM) drive system. Capacitor current reduction for volume minimization of DTP-PMSM drive system is important issue. Optimizing switching timings by MPC is promising approach. However, it is difficult to implement ideal MPC in a real system because it requires a huge amount of calculation to predict the capacitor current. In this paper, we propose a new method that is possible to search optimal switching timing for reducing the capacitor current by using the MPC, whose calculation amount can be implemented in real-time. This paper shows the possibility of realizing an capacitor current reduction method with high control performance by reducing the amount of computation for MPC.

I. Introduction

The double three-phase PMSM has attracted attention because of its high output and fault tolerance. There is a high requirement of installation space to the motors and the inverters. The smoothing capacitor in the filter circuit occupies a large volume in the inverters. The volume of a smoothing capacitor is proportional to the rms capacitor current. Therefore, research to reduce the capacitor current has been actively conducted [1] [2] [3].