This paper presents the development of sequence impedance models for modular multilevel
converters (MMC). The intended applications of the models include stability and resonance …

The small-signal impedance modeling of a modular multilevel converter (MMC) is the key for
analyzing resonance and stability of MMC-based power electronic systems. The MMC is a …

The dc impedance model of a modular multilevel converter (MMC) is the basis for analyzing
harmonic resonances of MMC-based dc systems. As an MMC typifies a multiple harmonic …

Harmonic state space (HSS) is seen as an effective impedance modeling method to
precisely characterize the internal harmonic features of the modular multilevel converter …

The fundamental frequency component in the arm currents of a modular multilevel converter
is a necessity for the operation of the converter, as is the connection and bypassing of the …

This paper presents a new switching-cycle state-space model of the modular multilevel
converter (MMC), on the basis of which unused switching states of this converter are …

The modular multilevel converter (MMC) has attracted extensive research in recent years.
An appropriate model is necessary to analyze stability or to design MMC controllers. Several …

This paper reveals the existence of poorly damped resonant modes in the modular
multilevel converter (MMC) that can result in harmonic instability. A small-signal model …

In this paper, the analytical solution for the submodule voltage ripple equations of a modular
multilevel converter (MMC) is derived, based on the knowledge of the external …

This paper demonstrates that the sum and difference of the upper and lower arm voltages
are suitable variables for deriving a generalized state-space model of a modular multilevel …