交错式与传统模块化多电平变换器在电力传输与分配中的比较分析与优化设计

Modular Multilevel Converter with Interleaved Half-Bridge Submodules (ISM-MMC) has the potential to emerge as a new apparatus for power transmission and distribution due to offering expanded current and improved power quality. However, the applicability of converters depends on various factors, there is a lack of quantitative methods for assessing the economy and reliability of ISM-MMC. The appropriate topology between classical MMC and ISM-MMC remains elusive, and relevant design is also a challenge. To address these issues, this paper presents a design method for ISM-MMC that integrates cost, efficiency, and reliability to provide a basis for engineering applications. Classical MMC can be considered as a special case of ISM-MMC. By combining the topological structure and operational characteristics, analytical representation functions for cost, efficiency, and reliability are derived respectively. On this basis, a parameter optimization method is established, that can also provide a selection guideline between the two topologies. By rationally configuring parameters such as switch ratings and modularity, a balance between cost, reliability, and efficiency can be achieved. Simulation case studies show that ISM-MMC is suitable for high-current applications, and the optimal modularity of interleaving is 2–3. The insights from this paper are extended to provide a general design guideline.