基于变频调节的泵阀节能性系统设计研究

发布时间：2018-03-11 10:34

本文选题：泵阀联合控制　切入点：变频调节　出处：《新疆大学》2017年硕士论文　论文类型：学位论文

【摘要】：电液伺服系统作为泵阀协控液压缸的经典系统,在数控机床、锻压机械、船舶机械等一些高精度控制的机械领域得到广泛应用。但是常见的电液伺服系统普遍存在着能源利用率低,油源污染严重等问题。而对于传统容积调速的泵控系统则拥有很高的节能性,但是控制精度低的缺陷使得其一直无法在工程中得以运用。所以为了解决电液伺服系统泵控高效节能性与阀控快速响应性、控制精度高不兼容的问题,进而设计一种基于泵控单元实时变频调速的节能性泵阀协控系统。首先对泵阀节能性控制系统做模型分析,然后对泵控回路和阀控回路做性能分析设计相应的PID控制器来改善系统的性能。通过变频器的矢量控制方案设计基于变频调速的泵控回路。同时运用模糊PID控制算法对油源压力的变化实现平稳快速的调节电机转速。由于阀控回路中液压缸位置精度受到外界信号的干扰,设计前馈补偿PID控制算法对液压缸位移在干扰前进行补偿。对蓄能器进行模型的建立,在满足泵控系统的稳定性的同时验证通过泵口压力的变化调节电机转速的可行性,将蓄能器进行性能分析。确定了蓄能器的选择方案。通过AMEsim与simulink的联合仿真,变频电机的模型分析直接影响到所设计伺服系统的可实现性,因此改变电机的参数调节电机的性能。然后通过AMEsim将设计的基于变频调节的泵阀节能性系统进行模型的建立,在simulink中通过软件的模块程序化实现所需求的泵控模糊PID控制器和阀控前馈PID补偿控制器的功能,最后将两者进行串口通信联合仿真。通过分析比较设计的新型泵阀协控性系统在油源部分节能性相比传统的电液比例伺服系统更好,同时因为控制策略的设计响应速度得到提升,控制精度更高,以及验证了控制策略的有效性。
[Abstract]:As the classical system of pump valve cocontrol hydraulic cylinder, electro-hydraulic servo system is used in NC machine tool, forging machine, Some mechanical fields with high precision control, such as marine machinery, have been widely used, but the common electro-hydraulic servo systems have low energy efficiency. The oil source pollution is serious and so on. But for the traditional pump control system with volumetric speed regulation, it has a high energy saving property. But the defects of low control precision make it impossible to be used in engineering. So in order to solve the problem of high efficiency and energy saving of pump control and quick response of valve control in electro-hydraulic servo system, the control accuracy is not compatible. Then a kind of energy saving pump valve cocontrol system based on the pump control unit real-time frequency conversion speed regulation is designed. Firstly, the model analysis of the pump valve energy saving control system is done. Then the performance of pump control loop and valve control loop is analyzed and the corresponding PID controller is designed to improve the performance of the system. The pump control loop based on frequency conversion speed regulation is designed by the vector control scheme of frequency converter. At the same time, fuzzy PID control is used to control the system. The algorithm can adjust motor speed smoothly and quickly for the change of oil source pressure. Because the position accuracy of hydraulic cylinder in valve control loop is disturbed by external signal, The feedforward compensation PID control algorithm is designed to compensate the displacement of the hydraulic cylinder before interference. The model of the accumulator is built to satisfy the stability of the pump control system and to verify the feasibility of adjusting the motor speed through the change of the pump inlet pressure. The performance of accumulator is analyzed, and the selection scheme of accumulator is determined. Through the joint simulation of AMEsim and simulink, the model analysis of frequency conversion motor directly affects the realizability of the designed servo system. Therefore, the parameters of the motor are changed to adjust the performance of the motor. Then the design of the pump valve energy-saving system based on frequency conversion regulation is built by AMEsim. The functions of pump control fuzzy PID controller and valve-controlled feedforward PID compensation controller are realized by software module programming in simulink. Finally, the simulation of serial communication between the two is carried out. Through analysis and comparison, the new type pump valve cocontrol system is better than the traditional electro-hydraulic proportional servo system in saving energy in the oil source part. At the same time, the design response speed of the control strategy is improved, the control accuracy is higher, and the effectiveness of the control strategy is verified.
【学位授予单位】：新疆大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP273

【参考文献】