Abstract
In this paper, an idea about the hydraulic loading device is proposed to simulate the working mechanical environment of the steam valve joystick. The simulation based on the mathematical model of active and passive loading system is utilized to reveal that the stiffness of connection components in loading system has an important influence on the control accuracy of the system. Additionally, the paper provides a design on the structure of the connecting components of valve stem. For the control strategy, a dual inertia link is used to stabilize the system. Besides, a compensation method of partial structural invariance is adopted to reduce the influence of redundant force in passive loading test. Finally, The development mode of control engineering based on xPC rapid control prototype model is used to validate the loading system. The simulation and experimental results show that the dual inertia link and compensation method are effective techniques, and the passive loading error can be controlled within the tolerance of 300N.
Highlights
Steam valves of steam turbines are important components in the regulation and protection system of steam turbines, which play a key role in the safe operation of steam turbines [1]
The main factor affecting the control accuracy of the hydraulic loading system is redundant force, which is generated by the additional flow caused by the passive movement of the loading system
The bandwidth of servo valve has a great influence on the compensation effect of redundant force
Summary
Steam valves of steam turbines are important components in the regulation and protection system of steam turbines, which play a key role in the safe operation of steam turbines [1]. Kai Guo proposed a nonlinear cascade controller based on an extended disturbance observer to track desired position trajectory for electro-hydraulic single-rod actuators in the presence of both external disturbances and parameter uncertainties [18]. A novel dynamic surface disturbance rejection control with synchronous compensation is proposed by Chenghu Jing to improve the torque tracking performance of electro-hydraulic load simulator [20]. In order to improve the dynamic response and disturbance rejection of an electrical-mechanical-actuator (EMA) and simplify control parameters tuning, a robust high-dynamic servo system based on linear active disturbance rejection control was proposed by Chunqiang Liu for an EMA employing a permanent magnet synchronous motor [21]. VOLUME 8, 2020 to compensate the redundant force disturbance caused by active motion of shaking table and to obtain high fidelity force loading tracking performance [22]. The real-time control system of loading system is developed based on xPC rapid control prototype method and experimental research is carried out
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