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潮流能透平装置的变桨距系统是潮流能商业化应用的关键性部件。在分析潮流能变桨距系统特点的基础上,设计了一套新型的液压式变桨距系统。系统由液压缸前置的齿轮齿条式执行机构及基于电液比例技术的液压控制系统组成。采用连续域—离散化的方法设计了液压控制系统并在厂房内开展了开环及闭环变桨试验。试验结果显示系统的调桨角度达到188.3°,最大变桨速度为3.36°/s,验证了系统变桨对流的功能。试验发现,采用数字比例—积分—微分(PID)算法的控制系统响应速度快,能够实现节距角的精确控制,阶跃响应调整时间小于1s,稳态误差小于0.05°。
Power Flow Pitch pitch systems are key components for the commercialization of power flow. Based on the analysis of the characteristics of tidal current variable pitch system, a new type of hydraulic pitch control system is designed. The system consists of a rack and pinion actuator in front of the hydraulic cylinder and a hydraulic control system based on electro-hydraulic proportional technology. The continuous domain-discretization method was used to design the hydraulic control system and the open-loop and closed-loop pitch experiments were carried out in the plant. The test results show that the system achieves a pitch angle of 188.3 ° and a maximum pitch speed of 3.36 ° / s, which verifies the function of system pitch-convection. The experimental results show that the control system with digital proportional-integral-derivative (PID) algorithm has fast response and accurate control of pitch angle. The step response adjustment time is less than 1s and the steady-state error is less than 0.05 °.