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多端口直流-直流自耦变压器

DOI: 10.13334/j.0258-8013.pcsee.2015.03.028, PP. 727-734

Keywords: 多端口直流-直流变换器,多端口直流自耦变压器,自耦变压器,直流电网,直流输电

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Abstract:

该文提出了一种多端口直流-直流自耦变压器的拓扑,该多端口直流自耦变压器用于互联多个直流电压等级不同的直流系统。提出了多端口直流自耦变压器的潮流直接分析法以及潮流分解分析法,推导了多端口直流自耦变压器中各换流器额定电压与额定功率设计方法,设计了多端口直流自耦变压器的控制策略。以一个三端口直流自耦变压器为测试算例,在PSCAD/EMTDC下仿真验证了多端口直流自耦变压器的技术可行性。以互联±250、±320kV和±400kV直流系统为例,假设±250kV和±320kV系统的额定输入/输出功率分别为500MW和1000MW,采用常规的多端口直流-直流变换器技术所需要的换流器总容量为3000MW,而采用多端口直流自耦变压器技术所需要总的换流器仅为775MW,所使用的换流器总容量仅为现有技术的26%,显著节省了成本,降低了运行损耗。

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