集成耗能型MMC模块故障穿越等效测试方法

ABSTRACT The integrated energy‐consuming MMC (IEC‐MMC) plays a critical role in dissipating surplus power generated during the low‐voltage ride‐through process in offshore wind systems to achieve low‐voltage fault ride‐through. As the core equipment of the converter station, the converter valve must undergo a complete type test to ensure normal operation and successful fault crossing. However, existing research has primarily focused on theoretical analysis and simulation of the energy dissipation process in the IEC‐MMC, with limited investigation into equivalent testing methods for evaluating its fault ride‐through performance at the module level. To address this research gap, this paper proposes an equivalent assessment index covering the entire fault ride‐through process, taking the integrated energy‐consuming MMC valve as the research object, and resolves the problem of the lack of assessment index for the fault ride‐through equivalent test. Furthermore, an equivalent test circuit with integrated energy dissipation and a corresponding test methodology are proposed, offering a practical approach for replicating the stress variations experienced by the valve during fault ride‐through. At the same time, it also provides an important reference value for the type test of the converter valve.