模糊PID在卫生纸机烘缸进出口差压控制中的应用

Application of Fuzzy PID in Differential Pressure Control of Dryer Inlet and Outlet of Tissue Paper Machine

关键词:  模糊PID  可调热泵  烘缸进出口差压

Key Words:fuzzy PID  adjustable heat pump  differential pressure in dryer inlet and outlet

摘要:烘缸进出口差压是表征烘缸是否积水的一个重要参数，通常处于波动状态。在实际控制中的通常做法是利用PID控制算法将其控制于一个具体的数值，但由于烘缸排水的非均匀性，导致上述控制目的难以达到。因此，本课题提出一种利用“模糊”思想来控制卫生纸机扬克烘缸进出口差压的新方法，将烘缸进出口差压分成五个区段进行模糊化，再利用模糊控制算法来调整PID控制器参数，控制扬克烘缸进汽热泵的开度，从而达到控制烘缸进出口差压的目的，使得烘缸进出口差压稳定在一个合适的范围内。通过仿真及应用表明，系统中热泵开度变化平稳，烘缸进出口差压被控制在许可范围内，烘缸能保持长期不积水状态。

Abstract:The differential pressure of dryer inlet and outlet which isusually in a fluctuating state, is an important parameter indicating whether the dryer has accumulated water, Generally, the control strategy is use PID control algorithm to keep it in a specific value. The nonuniform drainage of the dryer results the differential pressure of dryer inlet and outlet in a normal fluctuation state, so the control purpose is difficult to achieve. In this paper, a new method to control the differential pressure of dryer inlet and outlet was proposed, in which “fuzzy” theory was applied to divide the differential pressure into five ranges and to adjust PID controller parameters for controlling the heat pump opening of the Yanke dryer, keeping the differential pressure of dryer inlet and outlet in a suitable range. Simulation and application showed that the heat pump opening changed smoothly, the differential pressure of dryer inlet and outlet was controlled within a certain range that ensured the dryer could maintain a state．