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Computer Science > Systems and Control

arXiv:1705.01030 (cs)
[Submitted on 2 May 2017]

Title:Impedance Analysis of Modular Multilevel Converter Based on Harmonic State-Space Modeling Method

Authors:Jing Lyu, Qiang Chen, Xu Cai, Marta Molinas
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Abstract:The small-signal impedance modeling of modular multilevel converter (MMC) is the key for analyzing resonance and stability of MMC-based ac power electronics systems. MMC is a converter system with a typical multi-frequency response due to its significant steady-state harmonic components in the arm currents, capacitor voltages, and control signals. Therefore, traditional small-signal modeling methods for 2-level voltage-source converters (VSCs) cannot be directly applied to the MMC. In this paper, the harmonic state-space (HSS) modeling approach is introduced to characterize the harmonic coupling behavior of the MMC. On this basis, the small-signal impedance models of the MMC are developed according to the harmonic linearization principle, which can include all the steady-state harmonic effects of the state variables, leading to the accurate impedance models. Furthermore, in order to reveal the impact of the internal dynamics and closed-loop control on the small-signal impedance of the MMC, three cases are considered in this paper, i.e., open-loop control, ac voltage closed-loop control, and circulating current closed-loop control. Finally, the analytical impedance models are verified by both simulation and experimental results.
Subjects: Systems and Control (eess.SY)
Cite as: arXiv:1705.01030 [cs.SY]
  (or arXiv:1705.01030v1 [cs.SY] for this version)
  https://doi.org/10.48550/arXiv.1705.01030

Submission history

From: Jing Lyu [view email]
[v1] Tue, 2 May 2017 15:43:04 UTC (690 KB)
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