PID gain predictive control based on two approximation model is proposed for the problems of the traditional PID control and predictive control.
提出一种基于二次逼近模型的PID增益预测控制，并阐述了该系统的结构、算法和应用特点。
The two methods of model simplification are presented for large scale systems, they are the least square approximation and the rational fraction approximation.
本文针对大系统的频域模型简化提出了两种方法：最小二乘近似法和有理分式近似法。
If the two preconditions are difficult to satisfy, the model error caused by the linear approximation will become difficult to control.
如果这两个前提难以满足，由线性化近似模型带来的模型误差将变得难以控制。
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