Various types of the fluid viscous devices widely used in bridge constructions both domestically and internationally, such as lock-up devices, fluid viscous dampers, fuse dampers, limited displacement dampers and friction viscous dampers, are introduced.

Coordinated optimization of multi-machine damping controller with genetic algarithm;

A wide-area measurement system(WAMS)based fuzzy adaptive coordinative damping controller is developed for multi-infeed HVDC system.

Based on the characteristic of having more than one control channels,the means of superposing multi-auxiliary damping controllers on the multi-control loops of UPFC or MUPFC is proposed.

For purpose of a better understanding and application in current limiting technology,puzzles and problems concerning the application of current_damped apparatus for high voltage parallel capacitors are explained and analysed by giving practical examples.