Control of open-winding permanent magnet generation system based on the rectifier-vector compensation method

A novel open-winding configuration of the permanent magnet generation system has been proposed with the rectifier-inverter topology. The rectifier is in series to one side of the open-end winding for the output DC voltage and inverter to another side for controlling. The topology has the feasibility of voltage regulation in the wide speed range compared to the traditional permanent magnet generation system. However, the system efficiency is low for the existence of high harmonic current caused by the nonlinear rectifier in the generation process. This paper presented the analysis of the causes and components of the current harmonics. The composition of the voltage vector diagram of the rectifier-inverter were analyzed based on the current state of the proposed generation system. In order to compensate the vector of the rectifier, the space voltage vector PWM control algorithm was proposed, and the harmonic suppression efficiency and feasibility of the control method is verified by the simulation and experimental results.