高精度矢量控制在乙酸乙酯生产中的应用

在乙酸乙酯生产过程中,原料输送、配比等环节要求驱动机构具备高精度速度和转矩控制能力,特别在低频情况下仍可提供连续稳定的转矩输出,并能向集散控制系统(DCS)等生产控制系统提供电机的电流、力矩等参数以及变频器其他信号状态,目前通用V/F变频器难以满足要求。本文在构建了交流异步电机的数学模型基础上,通过分析其非线性、强耦合的特点,采用Park、Clarke变换实现了定、转子变量的解耦,研制高精度矢量控制算法,提出包含电流磁链位置转换的电流、转速双闭环控制方案,编制了基于数字信号处理器(DSP)的软件,完成了矢量控制变频器的研制。所设计的高精度电机变频调速装置已应用于乙酸乙酯原料配比等生产过程,实际应用结果表明,该算法控制精度高、动态性能好,能够在较宽的频率下保证电机可靠的运行,各项性能指标优于普通的V/F控制策略,有一定的推广价值。

Application of high-precision vector control in ethyl acetate production

Raw material conveying and proportioning are important link in ethyl acetate production.In these parts，high-performance motor drive mechanisms are needed which are used to provide high-precise speed and stable toque output，especially in the low frequency situation.Meanwhile it is required that the drive mechanisms should also provide parameters like current，torque and other analog as well as digital signal to distributed control system（DCS）or other production control systems.It is hard to meet the requirements by using common inverter.Accordingly，a new motor diver system was designed.The nonlinear，strong coupling characteristics were founded by analyzing the math model of AC induction motor.Because it was difficult to control well by using common method，Clarke’s and Park’s transform was used for decoupling，a field oriented control algorithm was introduced，a current-speed double closed-loop scheme was proposed,and software was written based on digital signal processor(DSP),and finally the inverter was developed.The device was used in the ethyl acetate production process.From the results of the present production，it is shown that the device has high control accuracy，dynamic response over wide frequency and stable operation.The general performance of that is better than normal V/F，and it has a certain value for popularization.