A New Variable Structure pi Controller

Abstract

The invention discloses a novel variable structure PI controller including a given differential feedforward link, a proportion differential link, an integration link, an anti-integration saturation link, a control gain link, an amplitude limit link, an adder, a first subtracter, and a second subtracter. The given differential feedforward link and the anti-integration saturation link are mutually cooperated, so that the controller shows different structure characteristics on continuous change and non-continuous change givenness. The novel variable structure PI controller improves the tracking performance of the continuous change givenness while solving the problem of step response overshooting.

Description

technical field [0001] The invention belongs to the technical field of control, and in particular relates to a novel variable structure PI controller. Background technique [0002] Currently, if figure 1 The traditional linear PI controller shown, dominates in industrial applications due to its simplicity. However, there are some problems in traditional linear PI controllers, such as difficulty in tuning control parameters and overshoot in step response. [0003] Aiming at the overshoot problem of step response in traditional linear PI control, literature [1] (Han Jingqing. Active disturbance rejection control technology - control technology for estimating and compensating uncertain factors [M]. Beijing: National Defense Industry Press. 2008.) proposed A tracking differentiator is used to arrange the transition process to the step given to realize the non-overshoot control, but there is a problem of complicated parameter adjustment. Literature [2] (Huang Keyuan, Zhou Taot...

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Problems solved by technology

However, there are some problems in traditional linear PI controllers, such as difficulty in tuning control parameters, overshoot in step response, etc.

[0003] Aiming at the overshoot problem of step response in traditional linear PI control, literature [1] (Han Jingqing. Active disturbance rejection control technology - control technology for estimating and compensating uncertain factors [M]. Beijing: National Defense Industry Press. 2008.) proposed Using the tracking differentiator to arrange the transition process for the step given to achieve no overshoot control, but there is a problem of complex parameter adjustment

Literature [2] (Huang Keyuan, Zhou Taotao, Huang Shoudao, et al. Fast no-overshoot control strategy for permanent magnet servo system based on differential adaptive compensation[J]. Journal of Electrotechnical Society, 2014,29(09):137- 144.) Use output differential negative feedback to eliminate overshoot, but output differential will introduce noise and affect system performance

In order to suppress noise, literature [3] (Li Guangquan, Ge Hongjuan, Liu Tianxiang, Ma Chunjiang. Pseudo-differential feedback control of permanent magnet synchronous motor speed control system[J]. Journal of Electrotechnical Society. 2010,25(08):18-23. ) On the basis of literature [2], the PI control is changed to I control to form an IP controller. Although this method eliminates the overshoot, the tracking performance of the given continuous change becomes worse

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