A novel predictive current control for open-end winding induction motor drive with reduced computation burden and enhanced zero sequence current suppression

In automotive testing systems such as chassis dynamometers and engine dynamometers, predictive current control (PCC) can be used to provide fast torque response, and open-end winding topology can be used to reduce torque ripples. In this paper, a novel predictive current control method based on A-B-C frame, without using cost function, for open-end winding induction motor drive is proposed and implemented. The experimental results show that the proposed method reduces the computation time by 61.05% compared with conventional predictive current control method. It also reduces zero-sequence current and provides faster dynamic response.

I. Introduction

In automotive testing systems such as chassis dynamometers and engine dynamometers, induction motor is used to provide load torque and to emulate propulsion motors for electric vehicles. Fast torque response and low torque ripple are required to precisely evaluate the performance of the vehicle under test. To increase torque response, model predictive control (MPC) can be used due to its high bandwidth. To reduce the torque ripple, it is necessary to operate the converters at high switching frequencies. Compared with single inverter drives, dual inverter with open-end winding topology can double the effective switching frequency and therefore reduce the torque ripple by using interleaved switching of the two inverters [1]. In this configuration, either two isolated DC source or a common DC source shared by the two inverters can be used. The common DC source configuration is shown in Fig. 1. It has the advantage of lower cost and system volume, but zero-sequence current is inevitable due to the common path between the two inverters together with inverter dead-time and current zero-crossing effect [2].