Modeling of grid connected VSCs for power systems small signal stability analysis in DC link voltage control time scale - 2017


With the increasing use of voltage source converters (VSCs) in power electronics dominated power systems, oscillation phenomena in DC-link voltage management (DVC) timescale (around ten Hz) among multiple VSCs have occurred. Many studies have tried to analyze these oscillation issues, however all related to the one VSC scenario. To consider the dynamic interactions between VSCs in DVC timescale, particularly in the weak grid condition, this paper presents a tiny-signal model to perceive VSC external characteristics based mostly on motion equation concept conjointly featured in synchronous generator (SG). Comparisons of your time-domain simulation responses and eigenvalues show that the proposed model will hold the main behaviors of concern. The form of the model is terribly like the rotor motion equation in SG, with that power engineers have been terribly familiar. In addition, by establishing the connection between the unbalanced powers and state variables of internal voltage (viz., VSC output voltage), the modeling plan introduced in this paper can be applied to alternative power electronic devices.

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