基于小型风电系统电流源型逆变器的控制研究

摘要

当电流源型逆变器应用于分布式发电并网风电系统时,由于直流侧电流波动较大,传统的控制算法在实际应用时难以满足对高质量并网电流的要求.针对一种基于高电感永磁同步电机(PMSG)的小型直驱风力发电系统中电流源型逆变器,提出一种闭环动态控制策略来控制并网电流的波形和幅值,在理论上对该控制策略进行了详细地分析,并通过实验进行验证.结果表明,在直流电流波动较大的情况下,该控制策略能使逆变器输出电流THD较低同时其幅值能准确地跟踪指令.%DC input current of current source inverters (CSI) fluctuates dramatically in distributed generation applica tions such as in a wind generation system.Therefore, the control of a high quality grid-connected output current of the CSI is impossible to meet the requirement of the traditional control technology.This paper presents a dynamic closed loop control strategy to control both wave form and amplitude of output current of CSI fed to the grid for CSI of small scale direct drive wind generation systems based on high-inductance permanent magnet synchronous generator.The proposed control strategy is analyzed in detail in theory and validated by experiment results.