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基于自适应滑模和下垂控制的微源逆变器并联运行策略

DOI: 10.16411/j.cnki.issn1006-7736.2015.03.021, PP. 115-123

Keywords: 逆变器并联,自适应三阶滑模控制,虚拟阻抗,下垂控制,功率分担

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Abstract:

针对微源逆变器并联运行过程中存在的负荷扰动和功率分担精度问题,在组合式三相四线制逆变器拓扑的基础上,提出一种新的三环控制策略.该策略包含滑模电压内环、虚拟阻抗环和功率外环.其中,电压内环通过自适应鲁棒三阶滑模控制有效提高了逆变器的抗干扰和动态性能;在分析滑模电压闭环逆变器等效输出阻抗的基础上,分析了输出阻抗和线路阻抗对功率分配的影响机理,进而针对不同功率等级逆变器设计虚拟阻抗反馈系数,使逆变器等效输出阻抗呈阻性并满足功率分配的要求;最后,在传统下垂控制外环中加入暂态下垂项,用于消除系统中的低频振荡,并提高逆变器的动态性能.仿真分析和单相实验结果均验证了上述控制策略的有效性和鲁棒性.

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