A new riser anti-recoil control design is presented in this research paper using the novel riser hybrid tensioning system by combining a fast acting electrically powered riser tensioning system with existing conventional hydro-pneumatic tensioners. This work is the further development of a control system for the previous work presented in the framework proposal of riser hybrid tensioning system. This innovation that we bring forward here is all designed to increase operating envelope of the vessel. A system model integrating both electrical and hydro-pneumatic tensioners and the riser string is built for anti-recoil control purpose. The main goal of this control design is a safer and more predictable position control of the riser string. A LQG control design technique is applied here. A feedback controller with Kalman estimator of the system state space variables is designed and implemented. The Matlab simulation helped to demonstrate the concept feasibility of this anti-recoil control strategy and to further verify that a more robust and accurate control performance could be achieved by this riser hybrid tensioning system. This control technique increases the testability of the riser anti-recoil system; reduce potential damage and increase operator's confidence. The new proposed data logging system improves the detectability of the anti-recoil system. And the position control, when the riser string "soft hang-off' on the tensioners, opens the possibility to extend the operability to other applications.
展开▼
