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直接并联模块化逆变器零序环流抑制

, PP. 100-107

Keywords: FREEDM微网,直接并联模块化逆变器,理想机模型,零序环流抑制,功率均分

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Abstract:

新型FREEDM微网中,采用逆变器直接并联技术可提高固态变压器的并网容量,但受到运算放大器零点漂移、谐波扰动以及信号延迟等因素的影响,该技术存在严重的零序环流问题。在并联逆变器间零序环流的平均模型和同步旋转坐标模型基础上,分析dq0坐标轴参考信号与输出电压的关系,提出理想机模型对PWM调制波参考信号进行误差反馈调节,实现各逆变器之间互不干扰地进行零序环流抑制,采用顺序控制方案,增加了控制器的调节效率和准确度。在PSCAD/EMTDC环境下仿真结果表明,所采用控制策略对零序环流具有有效的抑制作用,同时提高了功率均分的准确度。

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