Despite its many desirable features, a bipolar dc microgrids (BDCMG) requires a large number of conventional dc-dc converters to feed power to its two poles. Besides, the BDCMG is also prone to voltage imbalance due to unequal load distribution across its two poles. To overcome these issues, this article presents a novel nonisolated boost-SEPIC type interleaved (BSTI) dc-dc converter topology that enables power from a single source to be fed into the two poles of the BDCMG, thereby, reducing the total number of converters in the system. The proposed converter can support bidirectional operation with synchronous rectification. Furthermore, the input current ripple is low due to interleaved operation. A novel method to mitigate the voltage imbalance in a BDCMG using BSTI converter is also proposed. In the proposed method, the neutral line-current in the BDCMG is reduced, thereby, decreasing the overall line-losses. The BSTI converter operates as a dc compensator (like STATCOM in ac systems), where, apart from the converter losses it does not supply or consume any active-power. Hence, no active source (e.g., battery) is required for mitigating the voltage imbalance. Detailed theoretical analysis and experimental results are presented to validate the efficacy and feasibility of the proposed schemes.

中文翻译：

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用于减轻低压双极直流微电网电压不平衡的新型升压-SEPIC型交错式DC__C转换器


尽管双极直流微电网 (BDCMG) 有许多理想的功能，但仍需要大量传统的直流-直流转换器为其两个极供电。此外，由于两极负载分布不均，BDCMG 也容易出现电压不平衡。为了克服这些问题，本文提出了一种新型非隔离升压 SEPIC 型交错 (BSTI) DC-DC 转换器拓扑，该拓扑使来自单个电源的功率能够馈送到 BDCMG 的两个极，从而减少转换器总数在系统中。所提出的转换器可以支持同步整流的双向操作。此外，由于交错操作，输入电流纹波较低。还提出了一种使用 BSTI 转换器减轻 BDCMG 电压不平衡的新方法。在所提出的方法中，BDCMG 中的中性线电流减少，从而降低总体线损。 BSTI 转换器作为直流补偿器运行（类似于交流系统中的 STATCOM），除了转换器损耗之外，它不提供或消耗任何有功功率。因此，不需要有源电源（例如电池）来减轻电压不平衡。详细的理论分析和实验结果验证了所提出方案的有效性和可行性。