| Abstract |
The Modular Multilevel Converter (MMC) represents the recent development among the diverseavailable topologies of VSC and is allegedly the most suitable solution for converters in HVDCtransmission systems. This paper investigates the stability of modular multi-level converters basedHVDC system connected to a weak ac grid. Small signal stability based on eigenvalues analysis is usedto study the interaction between the weak ac grid and the converter. The impact of control parameters,mainly the synchronization system (i.e., Phase Locked Loop) on the stability of the MMC is alsoconsidered in frequency domain. Finally, time-domain simulations and frequency domain analysis arecarried out using MATLAB/Simulink and symbolic toolbox to validate the effectiveness of the proposedstudy. |
