Research On The Key Technology Of The Controller Of All-electric Subsea Actuator

All-electric subsea production system is one of the desirable solutions of the subsea gas/oil production. As the most important component, the reliability and performance of subsea valve actuator contribuate a lot to the whole system. In this paper, the driver device and controller system are designed; according to the calculated result of the engineering parameters, the control method of the actuator is proposed, and a series of simulations based on the virtual prototype are implemented.Firstly,according to the existing electro-hydraulic subsea control system and its actuators,do further study on the overall plan of the all-electri subsea control system; discuss the way of driving the valve actuator. And then present the integrated design of electric and mechanical structure.Then, on the foundation of the integrated design plan of all-electric subsea valve actuator,the virtual prototype is established. Calculate the working load of gate valve actuator and then optimize the fall-safe device which is based on double spring in parallel with Fmincon from Matlab; to simplize the modelling process of virtual prototype, a parameterized model based on parameterized model is established with UG/OPEN API; after the parameterized model is imported into the Adams, a Adams dynamics parameterized model with Simulink interface is built for being invoked during the joint simulation.Moreover, propose the concrete control method; utilize the vector control method to drive the PMSM in the actuator; design a multi-motor synchronous driver based on the relative coupling strategy and fuzzy PID; choose the Integral Time Absolute Error(ITAE) to evaluate the performance of fuzzy PID controller and then utilize the genetic algorithm(GA)to optimize it; propose the confidence coefficient of GA individuals to improve calculating efficiency.Finally, simulation experiment is carried for evaluating these work. The fuzzy PID controller adjusted by GA method is simulated with Matlab, and the GA method is evaluated with the All Search method. And on this basis, check the control action of the signal generating device and electronic test unit, and verify the effectiveness of the whole system.