The increase in the penetration of renewable energy sources (RES) has reduced the
effective inertia of the power system dominated by synchronous machines. The reduction in …

The offshore ac side impedance model of the modular multilevel converter (MMC) based
high voltage direct current (HVdc) system is essential for analyzing the interaction stability …

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 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 …

The high-frequency resonances (HFRs) around 700 Hz and 1.8 kHz have occurred in Yu′
E project. Mechanism studies indicate that HFRs are caused by the interactions between the …

This article proposes an accurate dc-side impedance modeling method of modular
multilevel converter (MMC) and a control strategy for improving the stability of the dc system …

Impedance-based analysis methods are widely applied to the small-signal stability analysis
of grid-connected converters. As the initial step to carry out the impedance-based stability …

This article presents a harmonic-domain single-input single-output (SISO) equivalent
modeling technique for the impedance modeling and stability analysis of a single-phase grid …

Recently, high-frequency resonance (HFR) incidents have occurred in several MMC-HVDC
projects. The resonance frequency highly depends on system conditions, making mitigation …

The large integration of modular multilevel converters (MMC) has introduced stability issues.
The impedance-based stability analysis method is widely adopted, where the impedance …