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According to the special structure and operation mechanism of the maglev permanent magnet linear synchronous motor (PMLSM), this paper established a theoretical mathematical model of electromagnetic thrust and levitation force of the motor in two-phase rotating reference frame and then realized the stability control of PMLSM with the simulation models under vector control (VC). Considering the large...
The traction converter consists of a single-phase AC-DC rectifier and a three-phase DC-AC inverter. Due to special structural characteristics of single phase rectifier, a fluctuating voltage component with the frequency twice of the grid's, exists in DC-link voltage. Fed by fluctuating DC-link voltage, a beat phenomenon occurs in traction motor, and harmonic components appear in both stator current...
Modular Multilevel Converter (MMC) is mainly used in the high frequency field especially in the HVDC system. This contribution presents a control strategy of modular multilevel converter, which allows the converters to feed the three-phase machine from 0Hz to 50Hz. Experiments are provided and the drive system has a good performance.
The influence of cross coupling effect on the performance of the indirect rotor field oriented control (IFOC) for high power AC traction drives cannot be neglected due to the wide operation range, low switching frequency and so on. In this paper, the cross coupling problem between d and q axis current component in the IFOC scheme is discussed. An improved current regulation scheme is proposed based...
In this paper, a sensorless control with improved flux integrator for wound field synchronous motor is presented. This paper analyses the wound field synchronous motor's mathematical model. The stator flux can be accurately estimated based on the improved flux integrator with feedback compensator. With the estimated flux and only the q-axis inductance, the position is accurately estimated which is...
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