PROJECT TITLE :

Generalized Frequency-Domain Controller Tuning Procedure for VSC Systems

ABSTRACT:

This paper proposes a robust frequency-domain technique to tune the d- q decoupled control system employed in Modular Multilevel Converter-sort Voltage Source Converter (MMC-VSC) systems. A linearized state-area model of the MMC-VSC system is developed and used to calculate the steadiness-connected frequency-domain attributes. The controller style problem is formulated as an optimization problem. During this paper, the simulated annealing optimization technique is applied to search out the proportional-integral (PI) controller parameters that offer desired damping for the oscillatory modes and desired values for decaying exponential modes. The efficacy of this methodology is tested on the electromagnetic transient model of a two-terminal MMC-VSC system on the important-time digital simulators, and also the results are provided in this paper. Finally, tuned controller parameters for different ac system strengths are discussed and it is shown that this mathematical model is suitable to tune the PI-controller parameters for MMC-VSC systems connected to robust and weak ac networks.