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access icon free Stability analysis of modular multilevel converter based on harmonic state-space theory

© The Institution of Engineering and Technology
Received 21/05/2019, Accepted 17/09/2019, Revised 26/08/2019, Published 19/09/2019

Modular multilevel converter (MMC) is regarded as one of the most potential topologies for high-voltage direct current transmission system. However, the multi-frequency behaviour and complex control structure of MMC bright great challenges to the stability analysis, identification of factors affecting stability, and controller design. To address this problem, the harmonic state-space (HSS) theory is applied to MMC in this study. First, the small-signal HSS model is established to describe the multi-frequency behaviour of MMC. Capacitor voltage control, circulating current control, and output current control are also taken into account in the modelling. On this basis, the stability analysis is performed by evaluating the eigenvalues of the HSS model, and participation factor is introduced to identify the factors affecting stability. In addition, the proposed approach reveals the influence of different controllers on the system stability, providing guidance for the tuning of multiple controller parameters. Finally, the effectiveness and accuracy of the proposed approach are verified by simulation and experiment results.

Inspec keywords: electric current control; state-space methods; eigenvalues and eigenfunctions; voltage control; power convertors

Other keywords: modular multilevel converter; system stability; harmonic state-space theory; MMC bright great challenges; capacitor voltage control; potential topologies; small-signal HSS model; output current control; stability analysis; multifrequency behaviour; multiple controller parameters; controller design; complex control structure; high-voltage direct current transmission system

Subjects: Power convertors and power supplies to apparatus; Voltage control; Control of electric power systems; Current control

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