Study On The Utilization Method Of Drilling Energy Of Oil Drilling Machine With DC Side Accessing Flywheel Energy Storage

Oil rig generate a large amount of excess energy during the process of lifting lifting and releasing drilling tools,and these energy are not fully utilized,resulting in many problems such as energy waste.Therefore,studying the energy recovery method of oil rig system under heavy load and light load condition is of great significance to reduce energy waste,reduce mechanical loss and improve the economical operation of the system.Firstly,this thesis chooses the permanent magnet synchronous motor as the body motor of the flywheel energy storage device,the mathematical model of charge and discharge of permanent magnet synchronous motor is established,and the double closed loop vector control strategy of flywheel charge and discharge is studied.Secondly,the potential energy of the drill is analyzed,and the energy recovery scheme between the flywheel energy storage device and the braking resistor is designed.In addition,based on the analysis of the drilling load characteristics of the oil rig,the regenerative braking energy recoverable under different working conditions during the drilling is calculated.Considering the change of energy during the drilling of the oil rig,a charge and discharge energy management and coordinated control strategy for the flywheel energy storage device is proposed.The strategy includes switching control between flywheel charging and discharging,flywheel charging control,discharge feedforward control based on load current,and overcharge and overdischarge protection control.Under the energy management and coordinated control strategy,when the load changes,the energy conversion between the flywheel charging and discharging is first performed in response to the load change,and at the same time,the flywheel energy storage device adjusts the discharge speed according to the magnitude of the load current.In order to reduce the mechanical loss of flywheel energy storage device during charging and discharging process,the overcharge and overdischarge protection link is introduced,and the overcharge and overdischarge are controlled by the charging state of rotational speed.Through energy management and coordinated control,the flywheel energy storage device can provide energy to the load together with the generator during heavy load,and store excess energy at light load,reducing energy waste.Aiming at the problem of torque jitter during the discharge process of theflywheel energy storage device,a torque variable limiting proportional integral control method based on the flywheel speed state is proposed.In this method,the limit of the proportional integral regulator of the current loop is changed by the charging state of the flywheel speed to reduce the torque jitter in the discharge process.The simulation model is built in Matlab/simulink.The simulation results verify the feasibility and effectiveness of the proposed strategy.