Research on pressure control algorithm of a flow adjustable gas generator based on linear active disturbance rejection control

In order to improve effects of gas generator flow regulation, a pressure closed loop control system was built. The working principle was analyzed, and the dynamic model of the system was established. According to the characteristics of the system model, linear active disturbance rejection controller (LADRC) was designed to control it. Because of the extended state observer, LADRC can compensate the effect caused by parameter fluctuation on the output well in a larger range. It improves the speed of response and the control accuracy. Simulation results in different working conditions show that LADRC shortens 30% adjustment time, and reduces about 50% output caused by interference. It has better dynamic characteristics than the traditional controller.