多领域统一建模仿真下压缩机测试系统的PI参数整定

发布时间：2018-07-10 00:27

  本文选题：压缩机测试系统 + PI参数整定　； 参考：《西安交通大学学报》2016年08期

【摘要】：为了解决压缩机测试系统惯性大、纯滞后、耦合性强、各种扰动并存使得工况不能快速稳定的问题,采用多领域统一建模语言Modelica构造了压缩机测试系统的数学模型,将齐格勒-尼科尔斯方法应用于Dymola仿真软件来确定合理的比例积分(PI)参数,其实现过程包括在保证其他元件参数不变的情况下给气路膨胀阀以阶跃激励,再断开阶跃激励给系统添加PI控制器,由此总结出了各个PI参数对排气压力、吸气过热度、吸气压力和过冷度的影响规律。结果显示:排气压力或吸气过热度超调时适当增大比例增益或减小积分增益的设定值、振荡时适当减小积分增益设定值、吸气压力超调时适当减小比例增益设定值、稳定时间过长时增大比例增益或减小积分增益设定值、过冷时适当减小比例增益和积分增益,都将有利于系统的PI控制。该结果可为工程中的PI参数整定提供参考。
[Abstract]:In order to solve the problems of large inertia, pure lag, strong coupling and various disturbances in compressor test system, the mathematical model of compressor test system is constructed by using Modelica, a multi-domain unified modeling language. The Ziegler-Nichols method is applied to Dymola simulation software to determine the reasonable proportional integral (Pi) parameters. The realization process includes the step excitation of the gas path expansion valve under the condition that the parameters of other components are not changed. Then the step excitation is disconnected to add Pi controller to the system, and the influence of various Pi parameters on exhaust pressure, suction superheat, suction pressure and undercooling is summarized. The results show that when the exhaust pressure or the suction superheat overshoot, the proportional gain or the integral gain is increased appropriately, the set value of the integral gain is reduced properly during oscillation, and the proportional gain setting value is decreased when the suction pressure overshoot. Increasing the proportional gain or decreasing the integral gain when the stabilization time is too long, and decreasing the proportional gain and integral gain when the system is undercooled will benefit the Pi control of the system. The results can provide a reference for Pi parameter tuning in engineering.
【作者单位】： 西安交通大学能源与动力工程学院;
【分类号】：TH45
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本文编号：2111304