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本文对一个大型再沸油加热炉多变量控制系统进行了设计。由于被控对象是具有大时延的多变量过程,因此采用了多变量 Smith 预估器作时延补偿和多变量频域法(逆 Nyquist 阵列法)进行计算机辅助设计的手段。仿真结果表明:所设计系统变量间的关联已被有效地抑制;采用时延补偿使系统的动态特性有较明显的提高;而对于一定程度的模型失配,系统也有良好的鲁棒性。本设计方案已在现场实施。
In this paper, a large multi-variable control system of reboiler oil heating furnace was designed. Because the controlled object is a multivariable process with large delay, a multivariable Smith predictor is used for time-delay compensation and multivariate frequency-domain methods (inverse Nyquist array) for computer-aided design. The simulation results show that the correlation between the designed system variables has been effectively suppressed, the dynamic characteristics of the system have been obviously improved by the delay compensation, and the system has good robustness to a certain degree of model mismatch. The design has been implemented in the field.