Dynamic positioning vessel thruster load limit method based on on-line available power

Abstract

The invention provides a dynamic positioning vessel thruster load limit method based on on-line available power. The method includes computing available power of on-line generator sets in subareas and real-time load power of thrusters by real-time inspection of subarea situations of a distribution board of a dynamic positioning vessel electric propulsion system, then filtering by a digital filter so as to compute a load limit factor of each thruster and a power upper limit value that given thrust of each thruster must satisfy in next control cycle, and finally converting the power upper limit value to a given rotating speed and torque upper limit value of each thruster so as to prevent power failure of the whole vessel caused by overload of the thrusters and the electric propulsion system. Output of a dynamic positioning controller is limited by the aid of the available power of a power station and real-time power of the propulsion system according to optimized load limit coefficient, so that operation safety is improved, power failure of the whole vessel caused by the fact that motors are started untimely due to overload of the thrusters is reduced, and defects of a power station management system are overcome.

Description

technical field [0001] The invention relates to a control method of a dynamic positioning ship propeller, in particular to a real-time load limiting method of a dynamic positioning ship propeller. Background technique [0002] Energy is increasingly scarce in today's society, and asking for oil and natural gas from the vast ocean has become one of the important ways for various countries to solve energy problems. Dynamic positioning vessels equipped with advanced dynamic positioning systems are the main devices for offshore resource exploration and collection. A dynamically positioned ship refers to a ship that automatically maintains its own position (fixed position or predetermined track) and heading using only the thrust of its propellers. Different from operations on land, offshore operations of dynamic positioning vessels may encounter harsh working conditions such as wind, waves, and currents. The dynamic positioning system controls the thruster system to actively re...

AI Technical Summary

Problems solved by technology

However, for the special working condition of the ship dynamic positioning operation, the overload protection strategy for the propeller should be considered in the motor drive local controller of each propeller, and if the dynamic positioning ship is in the dynamic positioning operation under severe working conditions When the power management system starts the backup generator, the available power of the power system is seriously insufficient, and the rapid change of the propulsion load may easily cause a power failure of the power system

Images