三电平储能变流器的研制

Development of Three-level Energy Storage Converter

此处研制了一款大功率三电平储能变流器,对其主电路拓扑结构和数学模型进行了详细分析,并给出了恒流、恒功率和恒压充放电控制模式。针对传统三电平空间矢量脉宽调制(SVPWM)扇区多、控制复杂的问题,提出了基于两电平空间矢量的三电平载波调制方式,无需复杂分区即可实现三电平SVPWM和母线电容中点电压平衡。制作了实验样机并搭建了实验平台进行验证,验证了所设计的样机具有较好的稳态和动态性能。

A high-power three-level energy storage converter is developed.The topology structure and mathematical model of main circuit are analyzed in detail,and the charging and discharging control modes of constant current,constant power and constant voltage are given.For too many sectors and complex control of traditional three-level space vector pulse width modulation(SVPWM),a three-level carrier modulation method based on two-level space vector is proposed.Without complex partition,the three-level SVPWM and the midpoint voltage balance of bus capacitance can be realized.An experimental prototype is made and an experimental platform is set up to verify the good steady and dynamic performance of the designed prototype.