A Control Approach for Performance Improvement of MMR-Based SST in H2 Electrolyzer Applications
Zhengzhao Li (TU Delft - DC systems, Energy conversion & Storage)
Reza Mirzadarani (TU Delft - High Voltage Technology Group)
Jarno van der Weg (Vonk)
Werner Heyns (Vonk)
Robin van der Sande (TU Delft - DC systems, Energy conversion & Storage)
Mohamad Ghaffarian Niasar (TU Delft - High Voltage Technology Group)
Aditya Shekhar (TU Delft - DC systems, Energy conversion & Storage)
Pavol Bauer (TU Delft - DC systems, Energy conversion & Storage)
Zian Qin (TU Delft - DC systems, Energy conversion & Storage)
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Abstract
This paper introduces a novel control strategy for Modular Multilevel Resonant converters (MMR) in Solid-State Transformer (SST) applications, with a focus on medium-voltage conversion for hydrogen electrolyzers. The article first reviews voltage control methods in MMR, analyzing their operational principles and regulation capabilities. A continuous modulation index control method with double-step staircase waveform modulation is then proposed, simplifying the control scheme to a single control variable while maintaining robust controllability. Meanwhile, the proposed approach maintains comparable power loss and harmonic performance to existing methods under the investigated operating conditions. Simulations and experiments are conducted to verify the feasibility and practical implementation of the proposed approach.