模块化多电平变流器稳态运行特性分析

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Abstract Considering all the harmonic components for the arm current, this paper proposes a new steady-state operation characteristic analysis method for the modular multilevel converter(MMC).Based on the analysis of the coupling relationship among the internal electric variables of MMC, the general matrix equation of the system is derived and the analytical expression of the arm current, submodule capacitor voltage and circulating current is obtained, and then the operation law of these variables is concluded.The calculation process is relatively simpler and the analysis results are more accurate with this method.The simulation and experimental results based on 23-level MMC back-to-back platform are compared to the analytical results, respectively.It verifies that the proposed method is feasible and accurate.

Key words： Modular multilevel converter steady-state circulating current general matrix equation

Received: 14 January 2015 Published: 29 June 2015

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TM46

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2015/V30/I11/90

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