Abstract
Small-signal stability analysis of the voltage source converter (VSC) based multi-terminal DC (MTDC) grids has been mainly focused on the dynamics of AC/DC converters while there is a lack of consideration of DC networks with DC power-flow controllers. In this paper, an integrated small-signal model is established to investigate the interactions between VSC and DC current flow controllers (CFC). The impacts of the control system of CFC on small-signal stability of the integrated system and the impacts of the control system of VSC on the DC networks with CFC are discussed via eigenvalue analysis. The above interactions are demonstrated through dynamic simulations against both small and large disturbances using real time digital simulator (RTDS).
Highlights
Small-signal stability analysis of the voltage source converter (VSC) based multi-terminal DC (MTDC) grids has been mainly focused on the dynamics of AC/DC converters while there is a lack of consideration of DC networks with DC power-flow controllers
V OLTAGE source converter (VSC) based multi-terminal DC (MTDC) system is the preferred solution for grid connection of large-scale offshore wind farms [1], [2], as it is the feasible option for long distance submarine interconnection of passive and weak systems [3], [4]
The published papers on small-signal stability of VSC MTDC systems have mainly been focused on the dynamics of VSCs while there is a lack of considerations of DC networks with current flow controllers (CFC)
Summary
V OLTAGE source converter (VSC) based multi-terminal DC (MTDC) system is the preferred solution for grid connection of large-scale offshore wind farms [1], [2], as it is the feasible option for long distance submarine interconnection of passive and weak systems [3], [4]. In [8] the small-signal stability analysis has been carried out for a symmetric bipolar MTDC grid where different modes and interactions between AC systems and VSC following various disturbances were characterized. The published papers on small-signal stability of VSC MTDC systems have mainly been focused on the dynamics of VSCs while there is a lack of considerations of DC networks with CFC. There is a lack of analysis on the potential impacts of DC power-flow controller on existing MTDC system in terms of network stability and dynamic performance under disturbances. SMALL-SIGNAL STABILITY MODEL OF THE INTEGRATED AC/DC SYSTEMS WITHOUT/WITH CFC Fig. 1 shows the generic topology of a generalized AC/DC system, which consists of CFC-integrated DC networks, VSC and AC networks. First-order IEEE type 2 exciter and third-order power system stabilizer controllers are used with synchronous generators
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
