[en] power systems ; primary frequency control ; multi-terminal HVDC
[en] The authors consider a power system composed of several non-synchronous AC areas connected by a multiterminal high-voltage direct current (HVDC) grid. In this context, the authors propose a distributed control scheme that modiﬁes the power injections from the different AC areas into the DC grid so as to make the system collectively react to load imbalances. This collective reaction allows each individual AC area to downscale its primary reserves.
The scheme is inspired by algorithms for the consensus problem extensively studied by the control theory community. It modiﬁes the power injections based on frequency deviations of the AC areas so as to make them stay close to each other. A stability analysis of the closed-loop system is reported as well as simulation results on a benchmark power system with ﬁve AC areas. These results show that with proper tuning, the control scheme makes the frequency deviations converge rapidly to a common value following a load imbalance in an area.
These are the slides of a talk I gave at the 2012 Franco-Taiwanese workshop on Energy Management. This talk is related to my work on multi-terminal HVDC systems and ancillary services which is partially covered by this research paper.