Cooperated control strategy of generator re‐dispatching and multi‐HVDC modulation after ultra HVDC block

Coordinated multiple HVDC modulation emergency control for enhancing power system frequency stability

“…As the power modulation effect of different HVDC transmission line has been assessed in [19], the multi‐HVDC coordinated emergency control was firstly introduced in improving the frequency stability of the receiving‐end power system [20]. The researches have been verified that they have a good effect in limiting the post‐disturbance system steady frequency into a safe range [16–18, 20–22]. However, the frequency stability of the traditional power grid is mainly affected by the frequency tolerance of conventional generators.…”

Bi‐level optimised emergency load/generator shedding strategy for AC/DC hybrid system following DC blocking

“…A dispatching and control strategy of the UHVDC blocking fault in the sending-end power grid is proposed in [22], which is based on big data technology and guarantee the grid frequency and voltage do not exceed the limit. The authors of [23,24] realised power flow control by controlling DC power in multi-terminal HVDC grids. However, the above emergency control strategies only aim at high voltage lines, without a detailed analysis of the low voltage level control scheme, which is easy to cause 'overshedding' phenomenon in practical application.…”