Abstract
The impact of the system parameters and controller gain on the dynamic and steady state behavior of the multi-terminal direct current (MTDC) system is discussed using small signal model. The small signal model (SSM) of VSC is derived including controllers and measurement filters and it is also validated with non-linear detailed switched model in PSCAD simulator. The SSM of DC grid and VSCs are augmented into single SSM to study the stability of the MTDC system. The limitation of the PLL gain caused by the strength of AC grid (short circuit ratio) is illustrated using eigenvalues analysis. This analysis is done for different control scheme as well as operating mode. The range of stable region for different SCR and loads are checked by varying the PLL gain. The effect of the controller gain on the AC resonance is also discussed in this paper. As the VSC terminals are increased, the DC resonance appears and its impact on the bandwidth of the direct voltage controller is explained briefly.
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