LCL DC/DC Converter for DC Grids
LCL DC/DC Converter for DC Grids
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DOI：
10.1109/tpwrd.2013.2272834
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发表时间：
2013-09
影响因子：
4.4
通讯作者：
D. Jovcic;Lu Zhang
中科院分区：
文献类型：
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作者：
D. Jovcic;Lu Zhang
本文提出了一种 LCL DC-DC 转换器概念，该概念能够通过兆瓦级功率传输实现非常高的步进比。该转换器可以在将大功率直流电源连接到高压直流输电（包括未来的直流输电网络）方面找到潜在的应用。该转换器基于两个基于交流/直流绝缘栅双极晶体管的转换器和一个内部无源 LCL 电路，无需内部交流变压器。 LCL 电路旨在实现电压步进，无需任何无功功率循环，并具有潜在的软开关操作，可最大限度地减少开关损耗。所设计的转换器即使在极端的外部直流故障下也能够实现电流调节，因此转换器可以在直流故障下运行。交换机利用率优于类似拓扑，并且损耗相当低。提出了一种基于双有源桥变压器的转换器设计，以与所提出的 LCL 转换器进行比较。详细的 PSCAD 模型使用 100 MW 20 kV/300 kV 测试系统证实了结论。构建 LCL 200W 20V/100V dc/dc 原型转换器来验证所提出的拓扑。
This paper proposes an LCL dc-dc converter concept which is capable of achieving very high stepping ratios with megawatt-level power transfers. The converter can find potential application in connecting high-power dc sources to high-voltage dc transmission including future dc transmission networks. This converter is based on two ac/dc insulated-gate bipolar transistor-based converters and an internal passive LCL circuit without internal ac transformers. The LCL circuit is designed to enable voltage stepping without any reactive power circulation and with potentially soft switching operation which minimizes the switching losses. The designed converter has the ability to achieve current regulation even under extreme external dc faults and, therefore, the converter can operate through dc faults. The switch utilization is better than similar topologies and losses are reasonably low. A dual-active-bridge transformer-based converter design is presented to compare with the proposed LCL converter. A detailed PSCAD model confirms conclusions using a 100-MW 20-kV/300 kV test system. An LCL 200-W 20-V/100-V dc/dc prototype converter is built to validate the proposed topology.