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多功能并网逆变器与并网微电网电能质量的分摊控制

DOI: 10.13334/j.0258-8013.pcsee.2015.19.012, PP. 4947-4955

Keywords: 并网微电网,多功能并网逆变器,无功和谐波电流分摊,协调控制,无功和谐波视在功率下垂

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Abstract:

多功能并网逆变器(multi-functionalgrid-tiedinverter,MFGTI)在实现可再生能源并网的同时,复合了电能质量治理功能的并网逆变器,在微电网和分布式发电系统中具有重要的应用前景。该文针对并网微网中的谐波和无功电流等电能质量问题,研究多台MFGTI之间无互联通信线的协调控制策略,基于谐波和无功负荷容量下垂的思想提出了一种有效的协调控制方案。每台MFGTI根据设定的“并网点处无功和谐波负荷电流的视在容量”与“补偿比例系数”之间的下垂特性,实现并网微网中无功和谐波负荷电流在多台MFGTI之间的分摊。因此,每台MFGTI只需采集本地的电气信息,即可根据自身所能提供的补偿容量,独立、自治地参与微网电能质量的治理,不需要额外的互联通信线。此外,为了降低控制器的计算负担,提出了一种简化的计算方法,以有效识别负荷电流中待补偿分量的视在容量,并进行了详细分析和验证。最后,在一个并网微网实验平台上,利用两台10kVA的MFGTI验证了所提控制策略在分布式电源并网和并网微电网电能质量治理中的正确性和有效性。

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