LIU Haiyang,CUI Shumei,LIU Chuang,et al.Voltage Self-balancing Input-series Output-parallel DC Transformer Based on Switched Resonant Branch[J].Automation of Electric Power Systems,2022,46(20):139-146.
LIU Haiyang,CUI Shumei,LIU Chuang,et al.Voltage Self-balancing Input-series Output-parallel DC Transformer Based on Switched Resonant Branch[J].Automation of Electric Power Systems,2022,46(20):139-146. DOI: 10.7500/AEPS20211215007.
Voltage Self-balancing Input-series Output-parallel DC Transformer Based on Switched Resonant Branch
For the input-series output-parallel (ISOP) DC transformer
the input voltage balance control is an essential but complex design. An improved input-side voltage self-balancing topology of the DC transformer is proposed based on dual active bridge modules. By integrating the switched resonant branches between the neighboring modules
the topology achieves the input-side voltage self-balance without extra switching devices. By analyzing the current stress of the switched resonant branches
it is found that the branches will not generate additional switching losses
nor will they affect the working principle of each module. Compared with the conventional decoupling algorithm of voltage-sharing control
the voltage self-balancing characteristic of the proposed topology avoids the system stability risk caused by insufficient modeling accuracy. In this paper
the voltage control design of the DC transformer is given
and the control scheme for the removal and recovery of the faulty module is given without changing the working state of the resonant branch. The functions and characteristics of the topology are verified by simulation and experiments.
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references
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