本文選題：壓縮機(jī)測試系統(tǒng) + PI參數(shù)整定��； 參考：《西安交通大學(xué)學(xué)報(bào)》2016年08期

【摘要】：為了解決壓縮機(jī)測試系統(tǒng)慣性大、純滯后、耦合性強(qiáng)、各種擾動(dòng)并存使得工況不能快速穩(wěn)定的問題,采用多領(lǐng)域統(tǒng)一建模語言Modelica構(gòu)造了壓縮機(jī)測試系統(tǒng)的數(shù)學(xué)模型,將齊格勒-尼科爾斯方法應(yīng)用于Dymola仿真軟件來確定合理的比例積分(PI)參數(shù),其實(shí)現(xiàn)過程包括在保證其他元件參數(shù)不變的情況下給氣路膨脹閥以階躍激勵(lì),再斷開階躍激勵(lì)給系統(tǒng)添加PI控制器,由此總結(jié)出了各個(gè)PI參數(shù)對排氣壓力、吸氣過熱度、吸氣壓力和過冷度的影響規(guī)律。結(jié)果顯示:排氣壓力或吸氣過熱度超調(diào)時(shí)適當(dāng)增大比例增益或減小積分增益的設(shè)定值、振蕩時(shí)適當(dāng)減小積分增益設(shè)定值、吸氣壓力超調(diào)時(shí)適當(dāng)減小比例增益設(shè)定值、穩(wěn)定時(shí)間過長時(shí)增大比例增益或減小積分增益設(shè)定值、過冷時(shí)適當(dāng)減小比例增益和積分增益,都將有利于系統(tǒng)的PI控制。該結(jié)果可為工程中的PI參數(shù)整定提供參考。
[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.
【作者單位】： 西安交通大學(xué)能源與動(dòng)力工程學(xué)院;
【分類號】：TH45
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本文編號：2111304