The Design of Parallel IGBT Modular for Modularized Wind Power Converter

Aiming at meeting the requirement of modularization for megawatt wind power converter, the paralleling structure of IGBT modules was designed. Fast transient response and current sharing capabilities of the paralleled IGBT modules were regarded as the main research object, the drive circuit and adapter plate was also designed. utilizing the new type of protection circuit on the adapter plate to ensure reliability of the paralleled IGBT modules. As one of the most promising technologies, Digital drive technology was applied as the conception of the driver, and the core of the driver is FPGA and A/D sampling circuit. Using digital driver had the advantages of good consistency pulse parameters, flexible software programming and high anti-jamming ability. The current equalization among the IGBT modules was verified by means of the field test. Based on the experiment, the characteristics of balancing parallel IGBTs' currents were better than previous designs. It is concluded that the whole design of the system was reasonable and can meet the demands of the engineering applications.