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对于一些具有较大的惯性和纯滞后的工艺对象,采用单回路控制系统,往往得不到理想的动态精度.这就需要引进其它辅助参数,构成多变量控制系统,来满足工艺要求,如串级控制系统、前馈控制系统等都是应用十分广泛的多变量控制系统. 一、串级控制系统 1.系统的构成和特点假设被控过程具有如下特点:(1)有较大的容积滞后或传输滞后,被调量对主要干扰和控制作用的响应很慢;(2)存在一个中间参数,这个参数对主要干扰
For some process objects with large inertia and pure hysteresis, the single-loop control system often can not get the ideal dynamic precision, which requires the introduction of other auxiliary parameters to form a multivariable control system to meet the process requirements, such as string Level control system and feedforward control system are all widely used multivariable control systems I. Cascade Control System 1. System Structure and Characteristics Assuming the controlled process has the following characteristics: (1) There is a large volume lag Or transmission lag, the response to the primary disturbance and control action is slow; (2) There is an intermediate parameter, which is a measure of the primary disturbance