GMC Series Modular Multilevel Converter (MMC）
In distribution networks where AC power consumption is predominant, DC distribution systems and AC distribution systems primarily rely on VSC-based medium-voltage converters to perform AC/DC conversion and power control, thereby enabling flexible interconnection between AC and DC networks.
The Modular Multilevel Converter (MMC) offers advantages such as ease of achieving a large number of voltage levels, excellent harmonic performance, and modular scalability. It has become the preferred voltage-source converter topology in flexible DC transmission systems.
In DC distribution networks, the AC/DC hub converter—responsible for linking the AC and DC medium-voltage grids—must be capable of flexible power regulation, DC bus voltage control, and rapid, controllable response to AC and DC faults. The MMC converter is likewise the optimal solution for these requirements.
Modular architecture with a high number of voltage levels and excellent harmonic performance
Circulating-current injection and hybrid AC/DC modulation techniques significantly reduce submodule capacitor requirements, decreasing power module volume by approximately 30%
AC fault ride-through capability and fast grid-connection/islanding switching technology
Active current-limiting control and robust power module design provide DC fault ride-through capability
AC/DC transient power support and coordination technology greatly enhance the operational reliability of distribution networks
