Comparative Evaluation of Control Techniques of PMSM Drive in Automotive Application

This paper deal with comparative evaluation of control techniques of Permanent magnet synchronous motor (PMSM) drive in automotive application is investigated. The FOC, DTC and proposed SVM-DTC with LC-Snubber circuit are presented. In SVM-DTC, this reduces low torque ripple by using space vector modulated. The parameters of FOC, DTC and proposed SVM-DTC with LC-Snubber method are studied by simulation. The simulation analysis of control method is investigated in terms of speed, current and torque ripples It was observed that the proposed method upgrade the performance of PMSM drive in respect to speed, current ripples, and torque responses

A novel self-powered supply for GCT gate drivers

This thesis is devoted to the development of a novel self-powered supply (SPS) for the gate driver of integrated Gate Commutated Thyristors (GCT). In commercial GCT power supplies, a high-voltage isolation transformer is an indispensable device. Since the GCT devices are normally for high-power converters operating at a voltage level of 2.3KV to 13.8KV, the high-voltage isolation transformer is expensive in cost and bulky in size. The SPS proposed in this thesis transfers energy from GCT snubber circuits and generates a regulated dc supply for the GCT gate driver. Since the snubber circuit is at the same potential as the GCT device, the insulation level of the self-powered supply is reduced from a few thousand volts to a couple of hundred volts, leading to a significant reduction in cost and size. In this thesis, the configuration of the proposed SPS is presented, and its operating principle is elaborated. The strategy for maximizing the SPS output power is analyzed. It is demonstrated that SPS can provide a regulated output up to 60W for most commercial GCT gate drivers. The performance of the SPS is verified by experiments on a 60W laboratory prototype.

A novel self-powered supply for GCT gate drivers

This thesis is devoted to the development of a novel self-powered supply (SPS) for the gate driver of integrated Gate Commutated Thyristors (GCT). In commercial GCT power supplies, a high-voltage isolation transformer is an indispensable device. Since the GCT devices are normally for high-power converters operating at a voltage level of 2.3KV to 13.8KV, the high-voltage isolation transformer is expensive in cost and bulky in size. The SPS proposed in this thesis transfers energy from GCT snubber circuits and generates a regulated dc supply for the GCT gate driver. Since the snubber circuit is at the same potential as the GCT device, the insulation level of the self-powered supply is reduced from a few thousand volts to a couple of hundred volts, leading to a significant reduction in cost and size. In this thesis, the configuration of the proposed SPS is presented, and its operating principle is elaborated. The strategy for maximizing the SPS output power is analyzed. It is demonstrated that SPS can provide a regulated output up to 60W for most commercial GCT gate drivers. The performance of the SPS is verified by experiments on a 60W laboratory prototype.

Efficiency Comparison of 2-Level SiC Inverter and Soft Switching-Snubber SiC Inverter for Electric Motor Drives

This paper focuses on the investigation and implementation of a high-performance power conversion system to reduce the overvoltage phenomenon in variable speed electric drive applications. Particularly, the pros and cons of using Silicon Carbide power MOSFETs in the power converter when a long power cable is employed in electric motor drive systems has been addressed. The three-phase two level inverter with the addition of snubber circuits that consist of capacitors and diodes has been investigated, designed and tested in order to mitigate the overvoltage problems without sacrificing the conversion efficiency. Given that the snubber circuit added to the switches can increase losses, an additional circuit is used to recover the energy from the snubber circuit. The proposed analysis has been then validated through an experimental campaign performed on the converter prototype. The experimental results show that the proposed converter can reduce the overvoltage at the electric motor terminals with excellent conversion efficiency compared to the classical solution like the three-phase two level inverter.